/* ============================================
   紫金县凤安中学2026届九（1）班毕业纪念网站
   设计方向：现代简约 · 编辑级排版 · 全站响应式
   ============================================ */

/* ========== CSS Custom Properties ========== */
:root {
    --color-bg: #FAFAF9;
    --color-surface: #FFFFFF;
    --color-text: #171717;
    --color-text-secondary: #6B7280;
    --color-text-tertiary: #9CA3AF;
    --color-border: #E8E8E4;
    --color-border-hover: #D4D4CF;
    --color-primary: #6366F1;
    --color-accent: #4F46E5;
    --color-accent-hover: #4338CA;
    --color-accent-subtle: #EEF2FF;
    --color-danger: #EF4444;
    --color-danger-hover: #DC2626;
    --color-success: #10B981;
    --color-warning: #F59E0B;

    /* CSS 变量别名（兼容页面内引用的短名称） */
    --text-primary: #171717;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --color-bg-tertiary: #F3F4F6;
    --color-primary-subtle: #EEF2FF;
    --color-primary-border: rgba(99, 102, 241, 0.2);
    --bg: #FAFAF9;
    --surface: #FFFFFF;
    --border: #E8E8E4;

    --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
    --font-display: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.06), 0 4px 10px rgba(0, 0, 0, 0.04);

    --max-width: 1200px;
    --nav-height: 72px;
    --marquee-height: 36px;
    --transition: 200ms ease;
    --transition-slow: 350ms ease;
}

/* ========== Smooth Scroll Offset (for fixed nav + optional marquee) ========== */
html { scroll-padding-top: calc(var(--nav-height) + var(--marquee-height) + 20px); }

/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    letter-spacing: -0.01em;
    /* 移动端性能优化 */
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    /* 消除移动端 300ms 点击延迟 */
    touch-action: manipulation;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; font-family: inherit; font-size: inherit; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

/* ========== Typography ========== */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

/* ========== Lucide Icons ========== */
.lucide {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}

.lucide-icon-16 { width: 16px; height: 16px; }
.lucide-icon-20 { width: 20px; height: 20px; }
.lucide-icon-24 { width: 24px; height: 24px; }
.lucide-icon-32 { width: 32px; height: 32px; }
.lucide-icon-48 { width: 48px; height: 48px; }

.icon-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.icon-wrap-sm { width: 36px; height: 36px; border-radius: 8px; }
.icon-wrap-md { width: 44px; height: 44px; border-radius: 10px; }
.icon-wrap-lg { width: 56px; height: 56px; border-radius: 12px; }

.icon-wrap-accent { background: var(--color-accent-subtle); color: var(--color-accent); }

/* ========== Navigation ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: rgba(250, 250, 249, 0.94);
    border-bottom: 1px solid transparent;
    transition: border-color 300ms ease, background 300ms ease;
    transform: translateZ(0);
    will-change: transform;
}

/* 网站关闭时跑马灯存在 → 导航栏下移 */
body.has-marquee .navbar {
    top: var(--marquee-height);
}

/* 仅在桌面端使用毛玻璃效果（移动端开销太大） */
@media (hover: hover) and (pointer: fine) {
    .navbar {
        background: rgba(250, 250, 249, 0.88);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
    background: rgba(250, 250, 249, 0.98);
}

/* Navbar container: wider to fully utilize viewport */
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 100%;
    padding: 0 48px;
}

.nav-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 0.03em;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    z-index: 1001;
}

.nav-logo .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
    transition: transform 300ms ease;
}

.nav-logo:hover .dot { transform: scale(1.5); }

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 12px 28px;
    border-radius: var(--radius);
    transition: all 250ms ease;
    white-space: nowrap;
    position: relative;
}

/* Subtle underline indicator on hover */
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
    transition: transform 250ms ease;
}

.nav-links a:hover {
    color: var(--color-text);
    background: var(--color-accent-subtle);
}
.nav-links a:hover::after { transform: translateX(-50%) scaleX(1); }
.nav-links a.active {
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    font-weight: 600;
}
.nav-links a.active::after { transform: translateX(-50%) scaleX(1); }

/* ========== Mobile Backdrop Overlay ========== */
.nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 999;
    opacity: 0;
    transition: opacity 350ms ease;
    transform: translateZ(0);
}
.nav-backdrop.active {
    display: block;
    opacity: 1;
}

/* ========== Mobile Toggle (Hamburger → X) ========== */
.nav-toggle {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 48px;
    height: 48px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    z-index: 1001;
    border-radius: var(--radius-sm);
    transition: background 200ms ease;
    /* Touch-friendly minimum size */
    min-width: 44px;
    min-height: 44px;
}

.nav-toggle:hover {
    background: var(--color-accent-subtle);
}

.nav-toggle:active {
    background: var(--color-border);
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transform-origin: center;
    transition: transform 350ms cubic-bezier(0.68, -0.55, 0.265, 1.55),
                opacity 250ms ease;
}

/* Hamburger → X animation */
.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ========== Page Header (Sub-page Hero) ========== */
.page-header {
    position: relative;
    padding: calc(var(--nav-height) + 80px) 24px 56px;
    text-align: center;
    max-width: 100%;
    margin: 0 auto;
    background: linear-gradient(180deg, #EEF2FF 0%, #F5F3FF 40%, var(--color-bg) 100%);
    overflow: hidden;
}

/* 装饰光球 */
.page-header::before {
    content: '';
    position: absolute;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
    top: -100px;
    right: -80px;
    pointer-events: none;
}

.page-header::after {
    content: '';
    position: absolute;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(236,72,153,0.07) 0%, transparent 70%);
    bottom: -60px;
    left: -60px;
    pointer-events: none;
}

body.has-marquee .page-header {
    padding-top: calc(var(--nav-height) + var(--marquee-height) + 80px);
}

.page-header .header-icon {
    position: relative;
    z-index: 1;
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: rgba(255,255,255,0.7);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--color-accent);
}

.page-header h1 {
    position: relative;
    z-index: 1;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #6366F1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    letter-spacing: -0.04em;
}

.page-header p {
    position: relative;
    z-index: 1;
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 480px;
    margin: 0 auto;
}

/* ========== Hero (Homepage) - Modern Redesign ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(160deg, #F8FAFC 0%, #EEF2FF 25%, #F5F3FF 50%, #FDF2F8 75%, #F8FAFC 100%);
    overflow: hidden;
}

/* 渐变光球背景层 */
.hero-bg-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.hero-gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: heroOrbFloat 12s ease-in-out infinite;
}

.orb-1 {
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(99,102,241,0.25), transparent 70%);
    top: -10%;
    right: -8%;
    animation-delay: 0s;
}

.orb-2 {
    width: 360px;
    height: 360px;
    background: radial-gradient(circle, rgba(236,72,153,0.18), transparent 70%);
    bottom: 5%;
    left: -5%;
    animation-delay: -4s;
}

.orb-3 {
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, rgba(139,92,246,0.2), transparent 70%);
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -8s;
}

@keyframes heroOrbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -20px) scale(1.08); }
    50% { transform: translate(-15px, 25px) scale(0.94); }
    75% { transform: translate(20px, 10px) scale(1.04); }
}

/* 粒子装饰 */
.hero-particles {
    position: absolute;
    inset: 0;
}

.hero-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-accent);
    opacity: 0.2;
    animation: heroParticleFloat 8s ease-in-out infinite;
}

@keyframes heroParticleFloat {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.15; }
    50% { transform: translateY(-30px) translateX(10px); opacity: 0.4; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 40px 24px;
    max-width: 800px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.06em;
    margin-bottom: 24px;
    padding: 7px 18px;
    border-radius: 100px;
    background: rgba(99,102,241,0.08);
    border: 1px solid rgba(99,102,241,0.12);
}

.hero h1 {
    font-size: clamp(2.6rem, 6.5vw, 5rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    color: var(--color-text);
    line-height: 1.12;
    margin-bottom: 16px;
}

.hero-title-line {
    display: block;
}

.hero-title-em {
    background: linear-gradient(135deg, #6366F1 0%, #A855F7 50%, #EC4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.15em;
}

.hero .subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    letter-spacing: 0.02em;
    margin-bottom: 0;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
}

/* Hero 数据统计 */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    margin-top: 36px;
}

.hero-stat-item {
    text-align: center;
}

.hero-stat-num {
    display: block;
    font-size: 2.4rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    color: var(--color-text);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}

.hero-stat-item:first-child .hero-stat-num {
    background: linear-gradient(135deg, #6366F1, #818CF8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat-item:last-child .hero-stat-num {
    background: linear-gradient(135deg, #EC4899, #F472B6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat-label {
    display: block;
    font-size: 0.82rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
    font-weight: 500;
    letter-spacing: 0.04em;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* Hero 向下滚动提示 */
.hero-scroll-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-top: 48px;
    color: var(--color-text-tertiary);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    opacity: 0.6;
    animation: heroScrollBounce 2s ease-in-out infinite;
}

@keyframes heroScrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ========== Preview Section (Homepage) ========== */
.preview-section {
    padding: 100px 0;
    background: var(--color-bg);
}

.preview-section .section-label {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.preview-section .section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: 56px;
}

.preview-block {
    margin-bottom: 56px;
}

.preview-block:last-child {
    margin-bottom: 0;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.preview-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.preview-more {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition);
}

.preview-more:hover {
    gap: 8px;
}

/* Preview Photos Grid */
.preview-photos {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    contain: layout style;
}

.preview-photo-item {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition-slow);
    transform: translateZ(0);
}

.preview-photo-item:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.preview-photo-item img,
.preview-photo-item video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.preview-photo-item:hover img,
.preview-photo-item:hover video {
    transform: scale(1.04);
}

.preview-photo-item .preview-photo-title {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 14px 16px;
    background: linear-gradient(transparent, rgba(0,0,0,0.6));
    color: #fff;
    font-size: 0.82rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-photo-item .video-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    background: rgba(0,0,0,0.6);
    border: 2px solid rgba(255,255,255,0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

/* Preview Messages */
.preview-messages {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.preview-message-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px 22px;
    display: flex;
    gap: 14px;
    transition: border-color var(--transition);
}

.preview-message-item:hover {
    border-color: var(--color-border-hover);
}

.pm-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.pm-body {
    flex: 1;
    min-width: 0;
}

.pm-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.pm-author {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--color-text);
}

.pm-time {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
}

.pm-content {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.preview-empty {
    text-align: center;
    padding: 32px;
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
}

/* ========== Features Section (Homepage Nav Grid) ========== */
.features-section {
    padding: 100px 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.features-section .section-label {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.features-section .section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: 12px;
}

.section-desc {
    text-align: center;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 52px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    max-width: 960px;
    margin: 0 auto;
}

.feature-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99,102,241,0.04), rgba(236,72,153,0.04));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 8px 30px rgba(99,102,241,0.1);
    transform: translateY(-3px);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon-wrap {
    background: var(--color-accent);
    color: #fff;
    transform: scale(1.05);
}

.feature-card-body {
    flex: 1;
    min-width: 0;
}

.feature-card-body h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
    letter-spacing: -0.01em;
}

.feature-card-body p {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.feature-card-arrow {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-card-arrow {
    color: var(--color-accent);
    transform: translateX(4px);
}

/* ========== Quote Section ========== */
.quote-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #1E1B4B 0%, #312E81 40%, #3730A3 100%);
    color: #FFFFFF;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.quote-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.quote-section::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99,102,241,0.2) 0%, transparent 70%);
    top: -100px;
    left: -100px;
    pointer-events: none;
}

.quote-section blockquote {
    position: relative;
    z-index: 1;
    font-size: 1.6rem;
    font-weight: 500;
    line-height: 1.7;
    max-width: 680px;
    margin: 0 auto 24px;
    letter-spacing: -0.01em;
    font-family: var(--font-display);
}

.quote-section .attribution {
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 0.04em;
}

/* ========== 班主任毕业赠言 ========== */
.teacher-message-section {
    padding: 100px 0;
    background: linear-gradient(180deg, #FEF9F0 0%, #FFF5EB 30%, #FDF2F8 70%, #F8FAFC 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.teacher-message-section::before {
    content: '';
    position: absolute;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(236,72,153,0.06) 0%, transparent 70%);
    bottom: -60px;
    right: -80px;
    pointer-events: none;
}

.teacher-message-section .section-label {
    position: relative;
    z-index: 1;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: #C0845A;
    margin-bottom: 8px;
    font-weight: 600;
}

.teacher-message-section .section-title {
    position: relative;
    z-index: 1;
    font-size: 2rem;
    font-weight: 700;
    color: #3D2C1E;
    margin-bottom: 48px;
    font-family: var(--font-display);
    letter-spacing: 0.04em;
}

.teacher-message-card {
    position: relative;
    max-width: 760px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 48px 44px 40px;
    box-shadow: 0 8px 40px rgba(139, 92, 50, 0.06), 0 2px 8px rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(192, 132, 90, 0.1);
    text-align: left;
    transition: box-shadow 0.3s ease;
}

.teacher-message-card:hover {
    box-shadow: 0 12px 48px rgba(139, 92, 50, 0.1), 0 4px 12px rgba(0, 0, 0, 0.04);
}

/* 顶部装饰线 */
.teacher-message-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #C0845A, #E8A87C);
    border-radius: 0 0 4px 4px;
}

.teacher-message-header {
    text-align: center;
    margin-bottom: 32px;
}

.teacher-badge {
    display: inline-block;
    font-size: 1.05rem;
    font-weight: 700;
    color: #3D2C1E;
    padding: 8px 24px;
    border: 2px solid rgba(192, 132, 90, 0.3);
    border-radius: 50px;
    letter-spacing: 0.03em;
    font-family: var(--font-display);
    background: linear-gradient(135deg, rgba(254, 249, 240, 0.6), rgba(255, 245, 235, 0.4));
}

.teacher-message-body {
    margin-bottom: 32px;
}

.teacher-message-body p {
    font-size: 1.05rem;
    line-height: 2;
    color: #4A3728;
    margin-bottom: 20px;
    text-indent: 2em;
}

.teacher-message-body p:last-child {
    margin-bottom: 0;
}

.teacher-message-footer {
    text-align: center;
    padding-top: 24px;
    border-top: 1px dashed rgba(192, 132, 90, 0.25);
    margin-bottom: 20px;
}

.teacher-greeting {
    font-size: 1.25rem;
    font-weight: 700;
    color: #C0845A;
    margin-bottom: 8px;
    letter-spacing: 0.04em;
    font-family: var(--font-display);
}

.teacher-wish {
    font-size: 1.15rem;
    font-weight: 600;
    color: #3D2C1E;
    letter-spacing: 0.04em;
    font-family: var(--font-display);
    margin-top: 8px;
}

.teacher-message-note {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: #B0A090;
    width: 100%;
    justify-content: center;
    letter-spacing: 0.02em;
}

/* ========== Footer ========== */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

/* ---- Footer Top (3-column grid) ---- */
.footer-top {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1.4fr;
    gap: 48px;
    padding: 64px 0 48px;
}

/* Column 1: Brand */
.footer-brand .footer-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 0.02em;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
}

.footer-brand .footer-logo .dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-accent);
}

.footer-brand .desc {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 280px;
}

/* Column 2: Quick Links */
.footer-col-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
    margin-bottom: 18px;
}

.footer-links-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links-list a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: color 200ms ease, transform 200ms ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.footer-links-list a:hover {
    color: var(--color-accent);
    transform: translateX(4px);
}

/* Column 3: Developer Info */
.footer-dev-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 22px;
}

.footer-dev-card .dev-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-dev-card .dev-name .icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.footer-dev-card .dev-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-dev-card .dev-info-item {
    font-size: 0.84rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    word-break: break-all;
}

.footer-dev-card .dev-info-item svg {
    flex-shrink: 0;
    color: var(--color-text-tertiary);
}

/* ---- Footer Bottom (Copyright Bar) ---- */
.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 22px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom .copyright {
    font-size: 0.83rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.footer-bottom .copyright svg {
    flex-shrink: 0;
}

.footer-bottom .credit {
    font-size: 0.83rem;
    color: var(--color-text-tertiary);
}

.footer-bottom .credit .heart-icon {
    display: inline-block;
    vertical-align: middle;
    margin: 0 3px;
    animation: heartbeat 1.4s ease infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    14% { transform: scale(1.15); }
    28% { transform: scale(1); }
    42% { transform: scale(1.15); }
    56% { transform: scale(1); }
}

/* ========== Filter Bar ========== */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 7px 20px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    transition: all var(--transition);
}

.filter-btn:hover { border-color: var(--color-border-hover); color: var(--color-text); }
.filter-btn.active { background: var(--color-text); color: #fff; border-color: var(--color-text); }

/* ========== Photo Gallery ========== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    contain: layout style;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4/3;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition-slow);
    transform: translateZ(0);
}

.gallery-item:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-item:hover img { transform: scale(1.04); }

.gallery-item .caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px 24px;
    background: linear-gradient(transparent, rgba(0,0,0,0.65));
    color: #fff;
}

.gallery-item .caption h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 2px; }
.gallery-item .caption span { font-size: 0.8rem; opacity: 0.75; }

/* Video badge on gallery thumbnails */
.video-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 56px;
    height: 56px;
    background: rgba(0,0,0,0.65);
    border: 2px solid rgba(255,255,255,0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    pointer-events: none;
    transition: transform 0.3s ease, background 0.3s ease;
}

.gallery-item:hover .video-badge {
    transform: translate(-50%, -50%) scale(1.1);
    background: rgba(0,0,0,0.8);
}

/* Video thumbnail fallback when <img> can't render the video */
.gallery-item.video-thumb-fallback {
    background: #1a1a2e;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-item.video-thumb-fallback .video-badge {
    position: static;
    transform: none;
}

/* ========== Lightbox ========== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.94);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
}

.lightbox.active { opacity: 1; pointer-events: auto; }

.lightbox img,
.lightbox video {
    max-width: 90vw;
    max-height: 80vh;
    border-radius: var(--radius);
    object-fit: contain;
}

.lightbox video {
    background: #000;
    border-radius: var(--radius);
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 32px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: background var(--transition);
    z-index: 2;
}

.lightbox-close:hover { background: rgba(255,255,255,0.2); }

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.lightbox-nav:hover { background: rgba(255,255,255,0.25); }
.lightbox-nav.prev { left: 24px; }
.lightbox-nav.next { right: 24px; }

.lightbox-info {
    position: absolute;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    text-align: center;
}

.lightbox-info h3 { font-size: 1rem; font-weight: 600; }
.lightbox-info p { font-size: 0.85rem; opacity: 0.6; margin-top: 4px; }

/* ========== Classmates Grid ========== */
.classmates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    contain: layout style;
}

.classmate-card {
    perspective: 1000px;
    cursor: pointer;
}

.classmate-card-inner {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    will-change: transform;
}

@media (hover: hover) and (pointer: fine) {
    .classmate-card:hover .classmate-card-inner { transform: rotateY(180deg); }
}

.classmate-card.flipped .classmate-card-inner { transform: rotateY(180deg); }

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.card-front {
    background: linear-gradient(160deg, #FFFFFF 0%, #F8FAFC 60%, #EEF2FF 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 36px 20px;
    gap: 14px;
    transition: box-shadow 0.3s ease;
}

.classmate-card:hover .card-front,
.classmate-card.flipped .card-front {
    box-shadow: 0 8px 30px rgba(99,102,241,0.12);
}

.card-front .avatar {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-accent-subtle);
    box-shadow: 0 4px 16px rgba(99,102,241,0.12);
    transition: transform 0.3s ease;
}

.classmate-card:hover .card-front .avatar {
    transform: scale(1.05);
}

.card-front .avatar-placeholder {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
    /* 多彩头像占位 — JS 通过 inline style 设置背景色 */
    background: var(--color-accent);
}

.classmate-card:hover .card-front .avatar-placeholder {
    transform: scale(1.05);
}

.card-front h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.card-front .english-name {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    font-weight: 400;
    margin-top: 2px;
}

.card-front .motto {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    text-align: center;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-front .flip-hint {
    font-size: 0.7rem;
    color: var(--color-text-tertiary);
    opacity: 0.5;
    transition: opacity var(--transition);
    margin-top: 4px;
}

.classmate-card:hover .flip-hint,
.classmate-card.flipped .flip-hint {
    opacity: 1;
}

.card-back {
    background: linear-gradient(135deg, #818CF8 0%, #A78BFA 50%, #8B5CF6 100%);
    color: #fff;
    padding: 32px 24px;
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.card-back .label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    opacity: 0.5;
    margin-bottom: 12px;
}

.card-back .message {
    font-size: 0.92rem;
    line-height: 1.75;
    font-weight: 400;
    color: rgba(255,255,255,0.9);
    max-width: 200px;
    position: relative;
}

.card-back .message::before,
.card-back .message::after {
    font-family: Georgia, serif;
    font-size: 1.6rem;
    opacity: 0.2;
    position: absolute;
    line-height: 1;
}

.card-back .message::before {
    content: '\201C';
    top: -6px;
    left: -12px;
}

.card-back .message::after {
    content: '\201D';
    bottom: -14px;
    right: -12px;
}

.card-back .contact {
    margin-top: 16px;
    font-size: 0.8rem;
    opacity: 0.6;
}

.card-back .btn-detail {
    margin-top: 14px;
    padding: 8px 18px;
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    color: #fff;
    font-size: 0.8rem;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.15);
    transition: background 0.2s ease, border-color 0.2s ease;
    min-height: 36px;
    min-width: 80px;
    -webkit-tap-highlight-color: transparent;
}

.card-back .btn-detail:hover,
.card-back .btn-detail:active {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

/* ========== Messages ========== */
.messages-container { max-width: 660px; margin: 0 auto; }

.message-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 48px;
    contain: layout style;
}

.message-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    gap: 16px;
    transition: all 0.3s ease;
    position: relative;
}

.message-item:hover {
    border-color: rgba(99,102,241,0.2);
    box-shadow: 0 4px 20px rgba(99,102,241,0.06);
    transform: translateY(-1px);
}

.message-item::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(99,102,241,0.02), rgba(236,72,153,0.02));
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.message-item:hover::after { opacity: 1; }

.message-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.message-body { flex: 1; min-width: 0; }

.message-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.message-meta .author { font-weight: 600; font-size: 0.9rem; color: var(--color-text); }
.message-meta .time { font-size: 0.8rem; color: var(--color-text-tertiary); }
.message-meta .dot-sep { width: 3px; height: 3px; border-radius: 50%; background: var(--color-text-tertiary); }

.message-body .content {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.65;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Message Form */
.message-form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.03);
}

.message-form h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group { margin-bottom: 18px; }

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.92rem;
    transition: all 0.25s ease;
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.08);
    background: var(--color-surface);
}

.form-group textarea { min-height: 140px; resize: vertical; }

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 26px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.25s ease;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
    color: #fff;
    box-shadow: 0 4px 14px rgba(99,102,241,0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #4F46E5 0%, #4338CA 100%);
    box-shadow: 0 6px 20px rgba(99,102,241,0.35);
    transform: translateY(-1px);
}

.btn-primary:active { transform: translateY(0); }

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-sm { padding: 6px 14px; font-size: 0.8rem; border-radius: var(--radius-sm); }

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========== Timeline ========== */
.timeline {
    position: relative;
    max-width: 660px;
    margin: 0 auto;
    padding: 8px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg,
        var(--color-accent) 0%,
        rgba(99,102,241,0.4) 30%,
        var(--color-border) 70%,
        rgba(236,72,153,0.3) 100%
    );
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-left: 72px;
    margin-bottom: 36px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 18px;
    top: 6px;
    width: 22px;
    height: 22px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.timeline-item:hover::before {
    background: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 0 0 8px rgba(99,102,241,0.12);
    transform: scale(1.15);
}

.timeline-date {
    font-size: 0.82rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366F1, #4F46E5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    letter-spacing: 0.06em;
}

.timeline-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.3s ease;
    position: relative;
}

.timeline-card:hover {
    border-color: rgba(99,102,241,0.2);
    box-shadow: 0 6px 24px rgba(99,102,241,0.08);
    transform: translateX(4px);
}

.timeline-card h3 {
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.timeline-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.timeline-card img {
    cursor: pointer;
    transition: all 0.3s ease;
}

.timeline-card img:hover {
    opacity: 0.9;
    transform: scale(1.01);
}

.timeline-card img,
.timeline-card video {
    width: 100%;
    border-radius: var(--radius);
    margin-top: 14px;
    border: 1px solid var(--color-border);
}

.timeline-video-wrap {
    margin-top: 14px;
    border-radius: var(--radius);
    overflow: hidden;
    background: #000;
    transition: opacity var(--transition);
}

.timeline-video-wrap:hover {
    opacity: 0.9;
}

.timeline-video-wrap video {
    display: block;
    width: 100%;
    margin-top: 0;
    max-height: 400px;
    object-fit: contain;
}

/* ========== Pagination ========== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 32px;
}

.pagination button {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    transition: all var(--transition);
}

.pagination button:hover:not(:disabled) {
    border-color: var(--color-text);
    color: var(--color-text);
}

.pagination button.active {
    background: var(--color-text);
    color: #fff;
    border-color: var(--color-text);
}

.pagination button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* ========== Empty State ========== */
.empty-state {
    text-align: center;
    padding: 72px 24px;
}

.empty-state .empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    color: var(--color-text-tertiary);
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
}

/* ========== Loading ========== */
.loading {
    text-align: center;
    padding: 48px;
    color: var(--color-text-tertiary);
}

.spinner {
    display: inline-block;
    width: 28px;
    height: 28px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ========== Toast ========== */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.25s ease;
    pointer-events: none;
}

.toast.success { background: var(--color-text); color: #fff; }
.toast.error { background: var(--color-danger); color: #fff; }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(-12px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ========== Scroll Reveal ========== */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Hero CTA */
.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.hero-actions .btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 15px 34px;
    border-radius: 100px;
    background: linear-gradient(135deg, #6366F1, #4F46E5);
    color: #fff;
    font-size: 0.98rem;
    font-weight: 600;
    transition: all 0.3s ease;
    letter-spacing: -0.01em;
    box-shadow: 0 4px 16px rgba(99,102,241,0.3);
}

.hero-actions .btn-hero-primary:hover {
    background: linear-gradient(135deg, #4F46E5, #4338CA);
    box-shadow: 0 6px 24px rgba(99,102,241,0.45);
    transform: translateY(-2px);
}

.hero-actions .btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 15px 34px;
    border-radius: 100px;
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.98rem;
    font-weight: 600;
    transition: all 0.3s ease;
    letter-spacing: -0.01em;
    border: 2px solid var(--color-border);
}

.hero-actions .btn-hero-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    box-shadow: 0 4px 16px rgba(99,102,241,0.1);
    transform: translateY(-2px);
}

/* ========== Detail Modal ========== */
.detail-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 9998;
    background: rgba(0,0,0,0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    padding: 20px;
    transform: translateZ(0);
}

/* 仅在桌面端使用毛玻璃 */
@media (hover: hover) and (pointer: fine) {
    .detail-modal-overlay {
        background: rgba(0,0,0,0.5);
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
    }
}

.detail-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.detail-modal {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 36px 32px;
    max-width: 520px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 24px 60px rgba(0,0,0,0.15);
    position: relative;
    transform: translateY(20px);
    transition: transform var(--transition-slow);
}

.detail-modal-overlay.active .detail-modal {
    transform: translateY(0);
}

.detail-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    color: var(--color-text-secondary);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.detail-modal-close:hover {
    background: var(--color-text);
    color: #fff;
    border-color: var(--color-text);
}

.detail-modal .dm-image {
    width: 100%;
    max-height: 320px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.detail-modal .dm-video {
    width: 100%;
    max-height: 360px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    background: #000;
}

.detail-modal .dm-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    display: block;
}

.detail-modal .dm-avatar-placeholder {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 auto 16px;
}

.detail-modal h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
    text-align: center;
}

.detail-modal .dm-meta {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    margin-bottom: 20px;
}

.detail-modal .dm-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 16px;
}

.detail-modal .dm-field {
    background: var(--color-bg);
    border-radius: var(--radius);
    padding: 14px 16px;
}

.detail-modal .dm-field .dm-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-tertiary);
    margin-bottom: 4px;
}

.detail-modal .dm-field .dm-value {
    font-size: 0.95rem;
    color: var(--color-text);
    font-weight: 500;
}

.detail-modal .dm-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-top: 16px;
    padding: 16px 20px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border-left: 3px solid var(--color-accent);
    position: relative;
}
.detail-modal .dm-desc-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.detail-modal .dm-desc-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}
.detail-modal .dm-desc::before {
    content: '\201C';
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 3rem;
    color: var(--color-accent);
    opacity: 0.12;
    position: absolute;
    top: 6px;
    left: 10px;
    line-height: 1;
    pointer-events: none;
}

/* ========== Timeline Lightbox (standalone) ========== */
.tl-lightbox-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,0.94);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    padding: 24px;
}

.tl-lightbox-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.tl-lightbox-overlay img,
.tl-lightbox-overlay video {
    max-width: 92vw;
    max-height: 85vh;
    border-radius: var(--radius);
    object-fit: contain;
}

.tl-lightbox-overlay video {
    background: #000;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.tl-lightbox-overlay .tl-lb-close {
    position: absolute;
    top: 20px;
    right: 28px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.12);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
    z-index: 2;
}

.tl-lightbox-overlay .tl-lb-close:hover {
    background: rgba(255,255,255,0.25);
}

.tl-lightbox-overlay .tl-lb-info {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    text-align: center;
    max-width: 600px;
}

.tl-lightbox-overlay .tl-lb-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.tl-lightbox-overlay .tl-lb-info span {
    font-size: 0.8rem;
    opacity: 0.55;
}

/* ========== 跑马灯公告栏（全站顶部） ========== */
.marquee-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1001;
    height: var(--marquee-height);
    background: var(--color-text);
    overflow: hidden;
    display: flex;
    align-items: center;
}

.marquee-track {
    display: flex;
    white-space: nowrap;
    animation: marqueeScroll 20s linear infinite;
    will-change: transform;
}

.marquee-text {
    display: inline-block;
    padding-right: 80px;
    color: #fff;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.04em;
}

@keyframes marqueeScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ========== 首页公告弹窗 ========== */
.announcement-popup-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
    padding: 20px;
}

.announcement-popup-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.announcement-popup-overlay.closing {
    opacity: 0;
}

.announcement-popup {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 36px 32px 28px;
    max-width: 480px;
    width: 100%;
    text-align: center;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2);
    transform: translateY(24px) scale(0.95);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.announcement-popup-overlay.active .announcement-popup {
    transform: translateY(0) scale(1);
}

.announcement-popup-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.announcement-popup h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.announcement-popup-body {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
    text-align: left;
    padding: 16px 20px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.announcement-popup-close {
    padding: 12px 36px;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    background: var(--color-accent);
    color: #fff;
    border-radius: 100px;
    font-weight: 600;
    transition: all var(--transition);
}

.announcement-popup-close:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}

/* ========== 网站关闭时公告占位 ========== */
.closed-announcement {
    text-align: center;
    padding: 56px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.closed-announcement-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.closed-announcement-text {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 480px;
    margin: 0 auto;
    white-space: pre-line;
}

/* ========== Responsive ========== */
@media (max-width: 1200px) {
    /* Slightly reduce spacing on medium-large screens */
    .navbar .container {
        padding: 0 36px;
    }
    .nav-links {
        gap: 20px;
    }
    .nav-links a {
        padding: 10px 20px;
    }

    .footer-top {
        gap: 36px;
    }
}

@media (max-width: 1024px) {
    .preview-photos {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 640px;
    }

    .hero-stats {
        gap: 24px;
    }
    .hero-stat-num {
        font-size: 2rem;
    }
    /* Further tighten nav for tablet landscape */
    .navbar .container {
        padding: 0 28px;
    }
    .nav-logo {
        font-size: 1.18rem;
    }
    .nav-links {
        gap: 10px;
    }
    .nav-links a {
        padding: 9px 16px;
        font-size: 0.875rem;
    }

    /* Footer: 2-column */
    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    .footer-brand { grid-column: 1 / -1; }
}

/* ========== Mobile Navigation (Drawer Style) ========== */
@media (max-width: 768px) {
    :root { --nav-height: 72px; }

    /* 全局移动端滚动优化 */
    html, body {
        -webkit-overflow-scrolling: touch;
    }

    /* 减少不必要的过渡动画 */
    .preview-photo-item,
    .gallery-item,
    .timeline-card,
    .feature-card {
        transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    }

    .container { padding: 0 20px; }
    .navbar .container { padding: 0 16px; }

    .nav-logo { font-size: 1.25rem; }

    /* Show hamburger toggle */
    .nav-toggle {
        display: flex;
    }

    /* Drawer menu: slides in from top with backdrop */
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: #FAFAF9;
        flex-direction: column;
        align-items: stretch;
        padding: 20px 16px 28px;
        gap: 6px;
        transform: translateY(-110%);
        opacity: 0;
        pointer-events: none;
        transition: transform 400ms cubic-bezier(0.22, 1, 0.36, 1),
                    opacity 350ms ease;
    }
    /* nav-links 的 fixed 定位相对于 .navbar（因为 .navbar 有 transform:translateZ(0)）
       .navbar 本身已下移了 marquee 高度，所以这里不需要再加 marquee 高度 */
    body.has-marquee .nav-links {
        top: var(--nav-height);
    }
    body.has-marquee .nav-links.active {
        max-height: calc(100vh - var(--nav-height) - var(--marquee-height));
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
        border-top: none;
        border-bottom: 1px solid var(--color-border);
        max-height: calc(100vh - var(--nav-height));
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        will-change: transform, opacity;
    }

    /* 菜单打开时隐藏导航栏底部边框，避免出现灰线间隔 */
    .navbar:has(.nav-links.active) {
        border-bottom-color: transparent !important;
    }

    /* Large touch-friendly nav items */
    .nav-links a {
        padding: 18px 24px;
        font-size: 1.1rem;
        font-weight: 500;
        border-radius: var(--radius);
        min-height: 56px;
        display: flex;
        align-items: center;
        transition: background 200ms ease, color 200ms ease, transform 200ms ease;
    }

    /* Stagger animation on menu items */
    .nav-links.active li:nth-child(1) a { transition-delay: 80ms; }
    .nav-links.active li:nth-child(2) a { transition-delay: 120ms; }
    .nav-links.active li:nth-child(3) a { transition-delay: 160ms; }
    .nav-links.active li:nth-child(4) a { transition-delay: 200ms; }
    .nav-links.active li:nth-child(5) a { transition-delay: 240ms; }
    .nav-links.active li:nth-child(6) a { transition-delay: 280ms; }

    .nav-links a:active {
        background: var(--color-border);
        transform: scale(0.98);
    }

    /* Hide underline effect on mobile */
    .nav-links a::after { display: none; }

    .hero { min-height: 90vh; }
    .hero-bg-layer { display: none; }
    .hero h1 { font-size: 2.3rem; }
    .hero .subtitle { font-size: 0.95rem; }
    .hero-title-em { font-size: 1.1em; }
    .hero-actions { flex-direction: column; gap: 12px; width: 100%; max-width: 320px; margin-left: auto; margin-right: auto; }
    .hero-actions .btn-hero-primary,
    .hero-actions .btn-hero-secondary { width: 100%; justify-content: center; padding: 14px 24px; font-size: 0.95rem; }
    .hero-stats { gap: 20px; margin-top: 28px; }
    .hero-stat-num { font-size: 1.8rem; }
    .hero-stat-label { font-size: 0.75rem; }
    .hero-stat-divider { height: 32px; }
    .hero-scroll-hint { display: none; }

    .features-section { padding: 64px 0; }
    .features-section .section-title { font-size: 1.5rem; }
    .section-desc { font-size: 0.88rem; margin-bottom: 36px; }
    .features-grid { grid-template-columns: 1fr; max-width: 400px; gap: 10px; }
    .feature-card { padding: 16px 20px; gap: 12px; }
    .feature-icon-wrap { width: 42px; height: 42px; border-radius: 12px; }

    .preview-section { padding: 64px 0; }
    .preview-section .section-title { font-size: 1.5rem; margin-bottom: 36px; }
    .preview-photos { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .preview-block { margin-bottom: 40px; }

    .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }

    .classmates-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }

    .timeline::before { left: 20px; }
    .timeline { max-width: 100%; padding: 0 4px; }
    .timeline-item { padding-left: 44px; margin-bottom: 28px; }
    .timeline-item::before { left: 11px; top: 5px; width: 17px; height: 17px; }
    .timeline-card { padding: 18px 20px; }

    .page-header { padding: calc(var(--nav-height) + 52px) 20px 40px; }
    .page-header::before { width: 200px; height: 200px; top: -60px; right: -60px; }
    .page-header::after { width: 160px; height: 160px; bottom: -40px; left: -40px; }
    .page-header .header-icon { width: 52px; height: 52px; border-radius: 14px; margin-bottom: 18px; }
    .page-header h1 { font-size: 1.7rem; }
    body.has-marquee .page-header { padding-top: calc(var(--nav-height) + var(--marquee-height) + 52px); }
    .page-header p { font-size: 0.95rem; }

    .quote-section { padding: 64px 0; }
    .quote-section blockquote { font-size: 1.25rem; }

    .teacher-message-section { padding: 64px 0; }
    .teacher-message-section .section-title { font-size: 1.6rem; margin-bottom: 36px; }
    .teacher-message-card { padding: 36px 24px 32px; }
    .teacher-message-body p { font-size: 0.95rem; line-height: 1.85; }
    .teacher-greeting { font-size: 1.1rem; }
    .teacher-wish { font-size: 1rem; }
    .teacher-badge { font-size: 0.95rem; padding: 6px 18px; }

    .message-form { padding: 24px 20px; }
    .message-item { padding: 18px 20px; }

    .detail-modal { padding: 28px 22px; max-width: 95vw; }
    .detail-modal .dm-fields { grid-template-columns: 1fr; gap: 10px; }
    .detail-modal h2 { font-size: 1.2rem; }

    .tl-lightbox-overlay img,
    .tl-lightbox-overlay video { max-width: 96vw; max-height: 70vh; }
    .tl-lightbox-overlay .tl-lb-close { top: 12px; right: 12px; width: 36px; height: 36px; }

    .lightbox-nav.prev { left: 8px; }
    .lightbox-nav.next { right: 8px; }
    .lightbox-close { top: 12px; right: 12px; }

    .pagination button { width: 40px; height: 40px; font-size: 0.9rem; }

    .filter-bar { gap: 6px; margin-bottom: 28px; }
    .filter-btn { padding: 6px 16px; font-size: 0.8rem; }

    /* Marquee & Popup mobile */
    :root { --marquee-height: 32px; }
    .marquee-banner { height: 32px; }
    .marquee-text { font-size: 0.75rem; }
    .announcement-popup { padding: 28px 20px 22px; margin: 0 10px; }
    .announcement-popup h2 { font-size: 1.15rem; }
    .announcement-popup-body { font-size: 0.88rem; padding: 12px 16px; }
    .closed-announcement { padding: 40px 16px; }
    .closed-announcement-text { font-size: 0.95rem; }

    /* Footer: single column */
    .footer-top {
        grid-template-columns: 1fr;
        gap: 36px;
        padding: 48px 0 36px;
    }
    .footer-brand .desc { max-width: 100%; }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .container { padding: 0 14px; }
    .navbar .container { padding: 0 14px; }
    .hero { min-height: 85vh; }
    .hero h1 { font-size: 1.85rem; }
    .hero .subtitle { font-size: 0.85rem; }
    .hero-eyebrow { font-size: 0.78rem; padding: 5px 12px; }
    .hero-stats { gap: 14px; margin-top: 24px; }
    .hero-stat-num { font-size: 1.5rem; }
    .hero-stat-divider { height: 26px; }

    .features-section { padding: 48px 0; }
    .features-section .section-title { font-size: 1.35rem; }
    .features-grid { gap: 8px; }
    .feature-card-body h3 { font-size: 0.9rem; }
    .feature-card-body p { font-size: 0.75rem; }

    .preview-photos { grid-template-columns: 1fr 1fr; gap: 8px; }
    .preview-messages { gap: 8px; }
    .preview-message-item { padding: 14px 16px; }

    .classmates-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .classmate-card-inner { aspect-ratio: 3/4.5; }
    .card-front { padding: 20px 14px; }
    .card-front .avatar,
    .card-front .avatar-placeholder { width: 72px; height: 72px; }
    .card-front h3 { font-size: 0.95rem; }
    .card-front .motto { font-size: 0.75rem; }

    .gallery-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .gallery-item { aspect-ratio: 3/3; border-radius: var(--radius-sm); }
    .gallery-item .caption { padding: 14px 16px; }
    .gallery-item .caption h3 { font-size: 0.85rem; }

    .timeline::before { left: 14px; }
    .timeline-item { padding-left: 36px; margin-bottom: 24px; }
    .timeline-item::before { left: 6px; width: 15px; height: 15px; }
    .timeline-card { padding: 14px 16px; border-radius: var(--radius); }
    .timeline-card h3 { font-size: 0.95rem; }
    .timeline-card p { font-size: 0.83rem; }
    .timeline-date { font-size: 0.75rem; }

    .quote-section blockquote { font-size: 1.1rem; padding: 0 12px; }

    .teacher-message-card { padding: 28px 18px 24px; border-radius: var(--radius-lg); }
    .teacher-message-body p { font-size: 0.88rem; line-height: 1.75; text-indent: 1.5em; }
    .teacher-badge { font-size: 0.85rem; }

    .preview-section { padding: 48px 0; }
    .preview-section .section-title { font-size: 1.35rem; }

    .page-header { padding: calc(var(--nav-height) + 40px) 16px 32px; }
    .page-header::before { width: 140px; height: 140px; top: -40px; right: -40px; }
    .page-header::after { display: none; }
    .page-header .header-icon { width: 44px; height: 44px; border-radius: 12px; margin-bottom: 14px; }
    .page-header h1 { font-size: 1.5rem; }
    body.has-marquee .page-header { padding-top: calc(var(--nav-height) + var(--marquee-height) + 40px); }

    .detail-modal { padding: 24px 18px; border-radius: var(--radius-lg); }
    .detail-modal .dm-image { max-height: 200px; }
    .detail-modal .dm-video { max-height: 220px; }

    .message-item { flex-direction: column; gap: 12px; align-items: flex-start; }

    .nav-logo { font-size: 1.15rem; }
    .navbar .container { padding: 0 12px; }

    /* Touch-friendly: larger tap targets */
    .nav-links a {
        padding: 18px 20px;
        font-size: 1.05rem;
        min-height: 52px;
    }
    .nav-links { padding: 16px 12px; gap: 4px; }
    .nav-toggle { width: 44px; height: 44px; }
    .filter-btn { min-height: 38px; padding: 8px 16px; }
    .pagination button { min-width: 40px; min-height: 40px; }

    /* Marquee & Popup small mobile */
    :root { --marquee-height: 28px; }
    .marquee-banner { height: 28px; }
    .marquee-text { font-size: 0.7rem; padding-right: 40px; }
    .announcement-popup { padding: 24px 16px 18px; border-radius: var(--radius-lg); }
    .announcement-popup h2 { font-size: 1.05rem; }
    .announcement-popup-body { font-size: 0.82rem; padding: 10px 14px; }
    .announcement-popup-close { padding: 10px 28px; font-size: 0.88rem; }
    .closed-announcement { padding: 32px 12px; }
    .closed-announcement-text { font-size: 0.88rem; }

    .footer-top {
        padding: 40px 0 28px;
        gap: 28px;
    }
    .footer-top .container { padding: 0 14px; }
    .footer-dev-card { padding: 16px 18px; }

    /* ---- add-classmate 页面 APP 风格优化 ---- */
    /* 导航栏 APP 标准高度（较桌面端 72px 收窄） */
    :root { --nav-height: 48px; }
    .navbar {
        height: var(--nav-height);
        will-change: transform;
    }
    html { scroll-padding-top: calc(var(--nav-height) + 20px); }

    /* 导航 logo：小号字重、紧凑间距 */
    .nav-logo { font-size: 0.9375rem; gap: 5px; }

    /* 页面标题区域：紧凑 APP 风格，减少上下留白 */
    .page-hero { padding: calc(var(--nav-height) + 20px) 0 16px !important; }
    .page-hero-icon { margin-bottom: 6px; }
    .page-hero-icon i { width: 36px !important; height: 36px !important; }
    .page-hero h1, .page-hero h1[style] { font-size: 1.2rem !important; margin-bottom: 2px !important; }
    .page-hero p, .page-hero p[style] { font-size: 0.8125rem !important; }

    /* 步骤指示器：紧凑三步，适合 375-480px 屏幕 */
    .steps-indicator { max-width: 300px; padding: 0 8px; margin-bottom: 10px; }
    .step-circle { width: 36px; height: 36px; }
    .step-circle i { width: 15px !important; height: 15px !important; }
    .step-item { gap: 4px; }
    .step-label { font-size: 0.6875rem; }
    .step-line { margin: 0 -2px 18px; min-width: 20px; height: 1.5px; }

    /* 令牌查询入口：虚线按钮，紧凑 */
    .token-lookup-bar { margin-bottom: 12px; }
    .token-lookup-btn { font-size: 0.8125rem; padding: 7px 16px; gap: 5px; min-height: 38px; }

    /* 主内容容器：撑满全宽 */
    .container[style*="max-width"] { max-width: 100% !important; padding: 0 12px; }

    /* 向导卡片：APP 卡片风格，适中圆角和边距 */
    .wizard-card {
        padding: 20px 14px;
        border-radius: var(--radius-lg);
        min-height: 260px;
        width: 100%;
        max-width: 100%;
        margin: 0 auto;
        box-shadow: var(--shadow-sm);
    }

    /* 验证图标：缩小圆形区域 */
    .verify-icon-wrapper {
        width: 52px; height: 52px;
        margin-bottom: 10px;
    }
    .verify-icon-wrapper i { width: 26px !important; height: 26px !important; }

    /* 验证标题/副标题：紧凑 */
    .verify-title { font-size: 1.125rem; margin-bottom: 2px; }
    .verify-subtitle { font-size: 0.8125rem; margin-bottom: 12px; }

    /* 验证方式切换标签：触控友好 */
    .verify-mode-tabs { gap: 6px; margin-bottom: 12px; }
    .verify-mode-tab {
        padding: 8px 16px;
        font-size: 0.8125rem;
        gap: 5px;
        border-radius: var(--radius-sm);
        min-height: 40px;
        transition: all 0.2s ease;
    }
    .verify-mode-tab i { width: 14px !important; height: 14px !important; }

    /* 输入框：APP 标准 44px 触控高度 */
    .verify-input-group { flex-direction: column; gap: 8px; }
    .verify-input {
        padding: 0 14px;
        font-size: 0.9375rem;
        min-width: 0;
        height: 44px;
        line-height: 44px;
        border-radius: var(--radius-sm);
        transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    /* 验证按钮：全宽、44px 高度 */
    .btn-verify {
        padding: 0 20px;
        font-size: 0.9375rem;
        height: 44px;
        width: 100%;
        justify-content: center;
        border-radius: var(--radius-sm);
        gap: 6px;
        transition: all 0.2s ease;
    }
    .btn-verify i { width: 18px !important; height: 18px !important; }

    /* 验证结果：成功提示条 */
    .verify-success-box {
        padding: 10px 16px;
        font-size: 0.9375rem;
        gap: 8px;
    }
    .verify-success-box i { width: 24px !important; height: 24px !important; }

    /* 表单输入框：统一 44px 高度 */
    .form-input {
        padding: 0 14px;
        font-size: 0.9375rem;
        height: 44px;
        line-height: 44px;
        transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }
    .form-textarea {
        min-height: 80px;
        padding: 12px 14px;
        line-height: 1.5;
    }

    /* 头像上传 + 姓名：移动端纵向堆叠 */
    .form-row-avatar {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 12px;
        margin-bottom: 12px;
    }
    .avatar-preview-circle {
        width: 88px; height: 88px;
        transition: border-color 0.2s ease, background 0.2s ease;
    }
    .avatar-preview-circle i { width: 22px !important; height: 22px !important; }
    .avatar-preview-circle span { font-size: 0.6875rem; }
    .upload-hint { font-size: 0.6875rem; margin-top: 6px; }

    /* 姓名只读输入框：全宽 */
    .name-display { width: 100%; }
    .name-display .form-input.readonly { font-size: 0.9375rem; }

    /* 表单区块：统一间距 */
    .form-section { margin-bottom: 12px; }
    .form-section-title { font-size: 0.875rem; margin-bottom: 8px; gap: 6px; }
    .form-section-title i { width: 15px !important; height: 15px !important; }
    .form-label { font-size: 0.8125rem; margin-bottom: 4px; }
    .contact-hint { font-size: 0.75rem; padding-left: 22px; margin: -2px 0 8px 0; }

    /* 联系方式：单列布局，紧凑间距，防止长内容溢出 */
    .contact-grid { grid-template-columns: 1fr; gap: 8px; }
    .contact-icon { width: 32px; height: 32px; border-radius: var(--radius-sm); }
    .contact-icon i { width: 14px !important; height: 14px !important; }
    .contact-item .form-input { height: 44px; min-width: 0; flex: 1; }

    /* 提交按钮：48px 突出高度 */
    .btn-submit {
        padding: 0 24px;
        font-size: 1rem;
        height: 48px;
        transition: all 0.2s ease;
    }
    .btn-submit i { width: 18px !important; height: 18px !important; }
    .submit-hint { font-size: 0.6875rem; margin-top: 10px; }

    /* 步骤3 成功页面：适度缩小，保持喜庆感 */
    .success-icon-wrapper { width: 72px; height: 72px; margin-bottom: 14px; }
    .success-icon-wrapper i { width: 44px !important; height: 44px !important; }
    .success-title { font-size: 1.35rem; margin-bottom: 6px; }
    .success-text { font-size: 0.875rem; margin-bottom: 18px; line-height: 1.5; }

    .token-display-box { padding: 14px 12px; margin-bottom: 16px; }
    .token-label { font-size: 0.75rem; margin-bottom: 8px; }
    .token-code { padding: 8px 10px; font-size: 0.75rem; }
    .btn-copy { width: 38px; height: 38px; }
    .btn-copy i { width: 14px !important; height: 14px !important; }
    .token-warning { font-size: 0.6875rem; margin-top: 8px; line-height: 1.4; }
    .token-warning i { width: 12px !important; height: 12px !important; }

    /* 分享区域：紧凑但有呼吸感 */
    .share-section { padding: 14px 12px; margin-top: 16px; }
    .share-header-row { font-size: 0.875rem; gap: 6px; margin-bottom: 4px; }
    .share-header-row i { width: 16px !important; height: 16px !important; }
    .share-desc { font-size: 0.75rem; margin-bottom: 10px; }
    .share-msg-preview {
        padding: 10px 12px;
        font-size: 0.75rem;
        max-height: 90px;
        margin-bottom: 10px;
        line-height: 1.5;
    }
    .btn-share { padding: 8px 16px; font-size: 0.8125rem; min-height: 40px; }
    .btn-share i { width: 14px !important; height: 14px !important; }

    /* 返回首页 / 前往同学录按钮 */
    .btn-back-home {
        padding: 10px 28px;
        font-size: 0.875rem;
        gap: 6px;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }
    .btn-back-home i { width: 16px !important; height: 16px !important; }
    /* 步骤3成功页前往同学录按钮（inline style 覆盖） */
    .success-content a[style*="background:var(--color-primary)"] {
        padding: 10px 28px !important;
        font-size: 0.9375rem !important;
        margin-top: 10px !important;
        display: inline-flex !important;
        align-items: center;
        gap: 6px;
    }

    /* 页脚间距 */
    .footer[style*="margin-top"] { margin-top: 48px !important; }

    /* 令牌弹窗：适配小屏幕 */
    .modal-content { padding: 20px 16px; margin: 0 12px; border-radius: var(--radius-lg); }
    .modal-close { width: 32px; height: 32px; top: 8px; right: 8px; }
    .modal-close i { width: 16px !important; height: 16px !important; }
    .modal-content h3 { font-size: 1.05rem; }
    .modal-content p { font-size: 0.8125rem !important; margin-bottom: 14px !important; }
    .modal-content input.form-input { height: 44px; margin-bottom: 8px; }
    .modal-content button.btn-submit { padding: 10px; height: 44px; }

    /* 状态卡片：已审核/审核中/已驳回 */
    .status-card { padding: 28px 16px; }
    .sc-icon-wrap { width: 60px; height: 60px; margin-bottom: 4px; }
    .sc-icon-wrap i { width: 30px !important; height: 30px !important; }
    .sc-avatar, .sc-avatar-placeholder { width: 68px; height: 68px; }
    .sc-avatar-placeholder { font-size: 1.5rem; }
    .sc-name { font-size: 1.125rem; }
    .sc-status-badge { font-size: 0.75rem; padding: 3px 12px; margin-bottom: 10px; }
    .sc-desc { font-size: 0.8125rem; }
    .sc-motto { font-size: 0.8125rem; }
    .sc-graduation { padding: 12px 16px; font-size: 0.8125rem; margin-bottom: 12px; max-width: 100%; }
    .sc-contacts { gap: 6px; margin-bottom: 10px; }
    .sc-contact-item { font-size: 0.75rem; }
    .sc-contact-label { padding: 3px 8px; font-size: 0.625rem; min-width: 28px; }
    .sc-contact-val { padding: 3px 8px; }
    .sc-time { font-size: 0.6875rem; margin-bottom: 14px; }
    .sc-reject-reason { font-size: 0.75rem; padding: 8px 12px; max-width: 100%; }
    .sc-actions { gap: 8px; margin-bottom: 14px; }
    .sc-actions .btn { padding: 10px 20px; font-size: 0.8125rem; min-height: 42px; }
    .sc-actions .btn i { width: 16px !important; height: 16px !important; }
    .sc-back-btn { font-size: 0.8125rem; padding: 8px 16px; min-height: 40px; }

    /* 底部版权：小号文字 */
    .footer-bottom .copyright { font-size: 0.6875rem; }

    /* ── APP 交互体验增强 ── */

    /* 移除移动端默认点击高亮 */
    *, *::before, *::after {
        -webkit-tap-highlight-color: transparent;
    }

    /* 确保可点击元素最小触控区域 ≥ 44px */
    .btn-verify, .btn-submit, .btn-share, .btn-back-home,
    .btn-copy, .modal-close, .verify-mode-tab, .token-lookup-btn,
    .sc-actions .btn, .sc-back-btn, .avatar-preview-circle {
        min-height: 44px;
    }

    /* 可点击元素 :active 按压反馈（缩放+透明度） */
    .btn-verify:active,
    .btn-submit:active,
    .btn-share:active,
    .btn-back-home:active,
    .btn-copy:active,
    .modal-close:active,
    .verify-mode-tab:active,
    .token-lookup-btn:active,
    .sc-actions .btn:active,
    .sc-back-btn:active,
    .success-content a[style*="background:var(--color-primary)"]:active,
    .nav-links a:active {
        opacity: 0.8;
        transform: scale(0.96);
        transition: transform 0.12s ease, opacity 0.12s ease;
    }

    /* 头像上传区域 :active 反馈 */
    .avatar-preview-circle:active {
        border-color: var(--color-accent);
        background: var(--color-accent-subtle);
        transform: scale(0.96);
        transition: all 0.15s ease;
    }

    /* 输入框聚焦：柔和靛蓝光圈 */
    .verify-input:focus,
    .form-input:focus,
    input[type="number"]:focus {
        border-color: var(--color-accent);
        box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
        background: #fff;
        transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    /* 核心交互元素统一过渡动画 */
    .wizard-card,
    .btn-verify,
    .btn-submit,
    .btn-share,
    .btn-back-home,
    .verify-mode-tab,
    .token-lookup-btn,
    .verify-input,
    .form-input,
    .sc-actions .btn,
    .sc-back-btn,
    .avatar-preview-circle,
    .btn-copy,
    .modal-close {
        transition: all 0.25s ease;
    }

    /* 步骤切换内容淡入 */
    .wizard-step {
        animation: fadeInUp 0.3s ease;
    }

    /* 状态卡片进场 */
    .status-card {
        animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
    @keyframes fadeInUp {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }
}

/* ============================================
   班级相册墙 (Album Wall)
   ============================================ */

/* 页面底色：深色沉浸体验 */
.album-wall-page {
    background: #0f0f0f;
    color: #e5e5e5;
    overscroll-behavior: none;
}

.album-wall-page .navbar {
    background: rgba(15, 15, 15, 0.94);
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

.album-wall-page .navbar.scrolled {
    background: rgba(15, 15, 15, 0.98);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.album-wall-page .nav-logo {
    color: #f0f0f0;
}

.album-wall-page .nav-links a {
    color: rgba(255, 255, 255, 0.55);
}

.album-wall-page .nav-links a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.album-wall-page .nav-links a.active {
    color: var(--color-accent);
    background: rgba(79, 70, 229, 0.15);
}

.album-wall-page .nav-toggle span {
    background: #e5e5e5;
}

/* 深色主题：移动端抽屉菜单适配 */
@media (max-width: 768px) {
    .album-wall-page .nav-links {
        background: rgba(18, 18, 18, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }

    .album-wall-page .nav-links.active {
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }

    .album-wall-page .nav-links a {
        color: rgba(255, 255, 255, 0.55);
    }

    .album-wall-page .nav-links a:hover {
        color: #fff;
        background: rgba(255, 255, 255, 0.06);
    }

    .album-wall-page .nav-links a:active {
        background: rgba(255, 255, 255, 0.1);
        transform: scale(0.98);
    }

    .album-wall-page .nav-links a.active {
        color: var(--color-accent);
        background: rgba(79, 70, 229, 0.15);
    }

    .album-wall-page .nav-backdrop {
        background: rgba(0, 0, 0, 0.5);
    }
}

/* Viewport: 全屏容器 */
.album-wall-viewport {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    z-index: 1;
    /* 完全接管触摸行为：禁止浏览器默认手势（下拉回弹、页面滚动、微信冲突） */
    touch-action: none;
    /* 阻止所有方向的边界回弹（iOS Safari / 微信 WebView） */
    overscroll-behavior: none;
    -webkit-overflow-scrolling: auto;
}

/* 顶/底部渐变遮罩 */
.album-wall-viewport::before,
.album-wall-viewport::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    z-index: 3;
    pointer-events: none;
}

.album-wall-viewport::before {
    top: 0;
    height: 80px;
    background: linear-gradient(to bottom, rgba(15, 15, 15, 0.9) 0%, rgba(15, 15, 15, 0.4) 50%, transparent 100%);
}

.album-wall-viewport::after {
    bottom: 0;
    height: 100px;
    background: linear-gradient(to top, rgba(15, 15, 15, 0.95) 0%, rgba(15, 15, 15, 0.5) 30%, transparent 100%);
}

/* 顶部标题覆盖层（3秒后自动淡出） */
.album-wall-header {
    position: absolute;
    top: 28px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
    text-align: center;
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.8s ease 3s; /* 3秒后开始淡出 */
}

/* 自动消失 */
.album-wall-header.faded {
    opacity: 0;
    transition: opacity 0.6s ease;
}

/* 顶部区域悬停时重新显示 */
.album-wall-viewport:hover .album-wall-header.faded {
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.album-wall-header h1 {
    font-size: 1.15rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 0.04em;
    margin-bottom: 2px;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.album-wall-header p {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.25);
    text-shadow: 0 1px 2px rgba(0,0,0,0.4);
}

/* 滚动轨道 - GPU 合成层优化 */
.album-wall-track {
    will-change: transform;
    /* 强制提升到独立 GPU 合成层，避免滚动时与其他元素共享层 */
    transform: translateZ(0);
    /* 注意：不要在此处使用 contain: layout style，
       它会阻止子元素图片在 GPU 合成层中正确绘制，
       导致图片显示为黑色（悬停时才强制重绘）。
       已知 Chromium bug：contain:layout + will-change:transform
       + 异步图片解码 → GPU 纹理上传被跳过。 */
}

/* 瀑布流网格 - 使用 CSS Columns */
.album-wall-grid {
    columns: 5;
    column-gap: 12px;
    padding: 70px 16px 0;
    /* 提升到独立 GPU 合成层 */
    will-change: transform;
    transform: translateZ(0);
}

/* 每个媒体项 */
.album-wall-item {
    break-inside: avoid;
    margin-bottom: 12px;
    border-radius: 10px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    cursor: pointer;
    /* 默认禁用所有过渡（99%时间在滚动），桌面端 hover 效果由下方媒体查询单独启用 */
    transition: none;
    position: relative;
    /* 提升到 GPU 合成层，不创建独立层（避免层爆炸） */
    transform: translateZ(0);
    /* 注意：移除 contain:paint，避免与 CSS columns + GPU 合成冲突 */
}

/* 骨架占位：纯静态渐变背景（已移除动画，GPU 负载降为零） */
.album-wall-item-pending .album-wall-media-wrap::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, 
        rgba(255,255,255,0.02) 0%, 
        rgba(255,255,255,0.05) 50%, 
        rgba(255,255,255,0.02) 100%
    );
    pointer-events: none;
}

/* 桌面端 hover 效果（触摸设备无 hover，直接跳过） */
@media (hover: hover) and (pointer: fine) {
    .album-wall-item:hover {
        transform: scale(1.03);
        border-color: rgba(255, 255, 255, 0.2);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
        z-index: 2;
        transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }
}

/* :active 效果保留（触摸反馈） */
.album-wall-item:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
}

/* 媒体包裹（图片/视频） */
.album-wall-media-wrap {
    position: relative;
    overflow: hidden;
    background: #1a1a1a;
}

.album-wall-media-wrap img,
.album-wall-media-wrap video {
    width: 100%;
    /* 高度由父容器 .album-wall-media-wrap 的 aspect-ratio 确定，
       图片填充固定尺寸容器，消除 height:auto + 异步加载导致的 reflow 与布局抖动 */
    height: 100%;
    object-fit: cover;
    display: block;
    /* 仅保留 opacity 过渡用于图片加载淡入，纯视觉无布局影响 */
    transition: opacity 0.4s ease;
}

/* 桌面端 hover 时图片微缩放 */
@media (hover: hover) and (pointer: fine) {
    .album-wall-item:hover .album-wall-media-wrap img,
    .album-wall-item:hover .album-wall-media-wrap video {
        transform: scale(1.05);
        transition: transform 0.5s ease, opacity 0.4s ease;
    }
}

/* ===== 滚动状态：默认所有过渡关闭（99%时间在滚动）===== */
/* --scrolling 为默认状态，确保子元素无过渡开销 */
.album-wall-grid--scrolling .album-wall-item,
.album-wall-grid--scrolling .album-wall-media-wrap img,
.album-wall-grid--scrolling .album-wall-media-wrap video {
    transition: none !important;
}

/* 视频播放按钮徽章 */
.album-wall-video-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    transition: transform 0.3s ease, background 0.3s ease;
}

.album-wall-item:hover .album-wall-video-badge {
    transform: translate(-50%, -50%) scale(1.15);
    background: rgba(0, 0, 0, 0.75);
}

/* 标题文本 */
.album-wall-caption {
    padding: 10px 12px;
    background: rgba(0, 0, 0, 0.3);
}

.album-wall-title {
    font-size: 0.78rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

/* 加载状态 */
.album-wall-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.9rem;
}

.album-wall-loading .spinner {
    border-color: rgba(255, 255, 255, 0.1);
    border-top-color: var(--color-accent);
}

/* 加载进度条容器 */
.album-wall-progress-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 280px;
    max-width: 75vw;
}

/* 进度条轨道 */
.album-wall-progress-bar {
    width: 100%;
    height: 3px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
    overflow: hidden;
}

/* 进度条填充 */
.album-wall-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), #818CF8);
    border-radius: 2px;
    width: 0%;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: width;
}

/* 进度文字 */
.album-wall-progress-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
    transition: color 0.3s ease;
}

/* 提示文字（网络状态等） */
.album-wall-progress-hint {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.3);
    min-height: 18px;
    text-align: center;
    line-height: 1.4;
    transition: color 0.3s ease;
}

/* 移动端适配 */
@media (max-width: 480px) {
    .album-wall-progress-container {
        width: 240px;
        gap: 10px;
    }
    .album-wall-progress-text {
        font-size: 0.78rem;
    }
    .album-wall-progress-hint {
        font-size: 0.7rem;
    }
}

/* 空状态 */
.album-wall-empty {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: rgba(255, 255, 255, 0.4);
}

.album-wall-empty .empty-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.album-wall-empty h3 {
    font-size: 1rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 6px;
}

.album-wall-empty p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.3);
}

/* 控制面板（暂停/播放 + 速度调节） */
.album-wall-controls {
    position: absolute;
    bottom: 24px;
    right: 24px;
    top: auto;
    z-index: 5;
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.album-wall-ctrl-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    outline: none;
    flex-shrink: 0;
}

.album-wall-ctrl-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.85);
    border-color: rgba(255, 255, 255, 0.25);
    transform: scale(1.08);
}

.album-wall-ctrl-btn:active {
    transform: scale(0.92);
}

/* 速度面板 */
.album-wall-speed {
    position: relative;
    display: flex;
    align-items: center;
}

.album-wall-speed-panel {
    position: absolute;
    top: 50%;
    right: calc(100% + 14px);
    transform: translateY(-50%);
    display: flex;
    flex-direction: row;
    gap: 6px;
    padding: 7px 10px;
    background: rgba(23, 23, 23, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 100px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    white-space: nowrap;
}

.album-wall-speed-panel.visible {
    opacity: 1;
    pointer-events: auto;
}

/* 速度预设按钮 */
.album-wall-speed-preset {
    width: 40px;
    height: 36px;
    border-radius: 22px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
    flex-shrink: 0;
}

.album-wall-speed-preset:hover {
    background: rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.85);
    border-color: rgba(255, 255, 255, 0.25);
    transform: scale(1.05);
}

.album-wall-speed-preset:active {
    transform: scale(0.93);
}

.album-wall-speed-preset.active {
    background: rgba(255, 255, 255, 0.18);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.35);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.08);
}

/* ========== 相册墙 - 响应式 ========== */
@media (max-width: 1400px) {
    .album-wall-grid {
        columns: 4;
    }
}

@media (max-width: 1024px) {
    .album-wall-grid {
        columns: 3;
        column-gap: 10px;
        padding: 56px 12px 0;
    }

    .album-wall-item {
        margin-bottom: 10px;
        border-radius: 8px;
    }

    .album-wall-header {
        top: 20px;
    }

    .album-wall-header h1 {
        font-size: 1rem;
    }

    .album-wall-header p {
        font-size: 0.65rem;
    }

    .album-wall-controls {
        bottom: 20px;
        right: 16px;
        top: auto;
        gap: 8px;
    }

    .album-wall-ctrl-btn {
        width: 48px;
        height: 48px;
    }
}

@media (max-width: 768px) {
    .album-wall-grid {
        columns: 2;
        column-gap: 8px;
        padding: 48px 10px 0;
    }

    .album-wall-item {
        margin-bottom: 8px;
        border-radius: 8px;
        /* 移动端完全禁用过渡追踪，消除合成器开销 */
        transition: none;
    }

    .album-wall-item:hover {
        transform: none;
    }

    .album-wall-item:active {
        transform: scale(0.97);
        transition: transform 0.1s ease;
    }

    /* 移动端恢复 img 加载淡入 */
    .album-wall-media-wrap img {
        transition: opacity 0.4s ease;
    }

    .album-wall-header {
        top: 16px;
    }

    .album-wall-header-icon {
        width: 44px;
        height: 44px;
        border-radius: 12px;
        margin-bottom: 12px;
    }

    .album-wall-header h1 {
        font-size: 0.95rem;
    }

    .album-wall-header p {
        font-size: 0.65rem;
    }

    .album-wall-caption {
        padding: 8px 10px;
    }

    .album-wall-title {
        font-size: 0.72rem;
    }

    .album-wall-video-badge {
        width: 36px;
        height: 36px;
    }

    .album-wall-video-badge i {
        width: 14px;
        height: 14px;
    }

    .album-wall-controls {
        bottom: 18px;
        right: 12px;
        top: auto;
        gap: 8px;
    }

    .album-wall-ctrl-btn {
        width: 46px;
        height: 46px;
    }

    .album-wall-speed-panel {
        right: calc(100% + 8px);
        padding: 6px 8px;
        gap: 5px;
    }

    .album-wall-speed-preset {
        width: 36px;
        height: 32px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .album-wall-grid {
        columns: 2;
        column-gap: 6px;
        padding: 40px 8px 0;
    }

    .album-wall-item {
        margin-bottom: 6px;
        border-radius: 6px;
        transition: none;
    }

    .album-wall-item:active {
        transform: scale(0.97);
        transition: transform 0.1s ease;
    }

    .album-wall-header {
        top: 12px;
    }

    .album-wall-header h1 {
        font-size: 0.85rem;
    }

    .album-wall-header p {
        font-size: 0.6rem;
        color: rgba(255,255,255,0.2);
    }

    .album-wall-video-badge {
        width: 32px;
        height: 32px;
    }

    .album-wall-video-badge svg {
        width: 14px;
        height: 14px;
    }

    .album-wall-controls {
        bottom: 16px;
        right: 10px;
        top: auto;
        gap: 8px;
    }

    .album-wall-ctrl-btn {
        width: 44px;
        height: 44px;
    }

    .album-wall-speed-panel {
        right: calc(100% + 6px);
        padding: 5px 7px;
        gap: 4px;
    }

    .album-wall-speed-preset {
        width: 32px;
        height: 28px;
        font-size: 0.72rem;
        border-radius: 18px;
    }

    .album-wall-viewport::before {
        height: 44px;
    }

    .album-wall-viewport::after {
        height: 56px;
    }
}

/* 跑马灯存在时的偏移 */
body.has-marquee .album-wall-viewport {
    top: calc(var(--nav-height) + var(--marquee-height));
}

/* ---- 同学录卡片联系方式标签 ---- */
.contact-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 8px;
    justify-content: center;
}

.contact-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.contact-tag.wechat { background: rgba(7, 193, 96, 0.12); color: #07C160; }
.contact-tag.qq { background: rgba(18, 183, 245, 0.12); color: #12B7F5; }
.contact-tag.ks { background: rgba(255, 73, 6, 0.12); color: #FF4906; }
.contact-tag.dy { background: rgba(254, 44, 85, 0.12); color: #FE2C55; }
.contact-tag.phone { background: rgba(107, 114, 128, 0.12); color: #6B7280; }
.contact-tag.legacy { background: rgba(79, 70, 229, 0.10); color: var(--color-accent); }

/* 背面联系方式芯片 */
.contact-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 8px 0;
    justify-content: center;
}

.contact-chip {
    display: inline-flex;
    align-items: center;
    gap: 0;
    padding: 0;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 100px;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.9);
    overflow: hidden;
}
.contact-chip .chip-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 3px 9px;
    font-size: 0.62rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #fff;
    min-width: 28px;
}
.contact-chip .chip-label.wechat { background: #07C160; }
.contact-chip .chip-label.qq     { background: #12B7F5; }
.contact-chip .chip-label.ks     { background: #FF4906; }
.contact-chip .chip-label.dy     { background: #FE2C55; }
.contact-chip .chip-label.legacy { background: var(--color-accent); }
/* 联系方式值文本（芯片右侧部分） */
.contact-chip :not(.chip-label) {
    padding: 3px 10px;
}

/* 背面更多联系方式提示 */
.more-contact-hint {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.35);
    margin-top: 8px;
    margin-bottom: 2px;
    letter-spacing: 0.02em;
}

/* ============================================
   同学录自填页面 (add-classmate.html)
   ============================================ */

/* ---- 页面头部 ---- */
.page-hero {
    position: relative;
    padding: calc(var(--nav-height) + 64px) 24px 40px;
    text-align: center;
    background: linear-gradient(180deg, #EEF2FF 0%, #F5F3FF 40%, var(--color-bg) 100%);
    overflow: hidden;
}
.page-hero::before {
    content: '';
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
    top: -80px;
    right: -60px;
    pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero-icon {
    margin-bottom: 16px;
}

/* ---- 步骤进度指示器 ---- */
.steps-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    max-width: 400px;
    margin: 0 auto 16px;
    padding: 0 20px;
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.step-circle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    color: var(--color-text-tertiary);
    transition: all 0.35s ease;
    position: relative;
    z-index: 2;
}

.step-item.active .step-circle {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}

.step-item.done .step-circle {
    background: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
}

.step-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    transition: color 0.35s ease;
    white-space: nowrap;
}

.step-item.active .step-label {
    color: var(--color-text);
    font-weight: 600;
}

.step-item.done .step-label {
    color: var(--color-success);
}

.step-line {
    flex: 1;
    height: 2px;
    background: var(--color-border);
    margin: 0 -4px 22px;
    z-index: 1;
    transition: background 0.35s ease;
    min-width: 20px;
}

.step-line.done {
    background: var(--color-success);
}

/* ---- 令牌查询入口 ---- */
.token-lookup-bar {
    text-align: center;
    margin-bottom: 20px;
}

.token-lookup-btn {
    background: none;
    border: 1px dashed var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.82rem;
    padding: 8px 18px;
    border-radius: 100px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition);
}

.token-lookup-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}

/* ---- 向导卡片 ---- */
.wizard-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 28px 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    min-height: 360px;
}

/* ---- 步骤1: 验证 ---- */
.step-content {
    text-align: center;
}

.verify-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.verify-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.verify-subtitle {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

/* ========== 验证方式切换标签 ========== */
.verify-mode-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 16px;
}

.verify-mode-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.verify-mode-tab:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.verify-mode-tab.active {
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

.verify-input-group {
    display: flex;
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
    flex-wrap: wrap;
    justify-content: center;
}

.verify-input {
    flex: 1;
    min-width: 200px;
    padding: 14px 18px;
    font-size: 1.05rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.verify-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.btn-verify {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-verify:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(79, 70, 229, 0.35);
}

.btn-verify:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.verify-result {
    margin-top: 20px;
}

.verify-success-box {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius);
    color: var(--color-success);
    font-size: 1rem;
    animation: fadeInUp 0.4s ease;
}

.verify-error {
    margin-top: 12px;
    color: var(--color-danger);
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 20px;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---- 步骤2: 填写表单 ---- */
.form-row-avatar {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.avatar-upload-wrapper {
    text-align: center;
    flex-shrink: 0;
}

.avatar-preview-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 2px dashed var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--color-bg);
    overflow: hidden;
    font-size: 0.72rem;
    color: var(--color-text-tertiary);
}

.avatar-preview-circle:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-subtle);
}

.upload-hint {
    font-size: 0.72rem;
    color: var(--color-text-tertiary);
    margin-top: 8px;
}

.name-display {
    flex: 1;
    min-width: 180px;
}

.name-display .form-input.readonly {
    background: var(--color-bg);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    font-weight: 600;
    font-size: 1.1rem;
}

.form-section {
    margin-bottom: 12px;
}

.form-section-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.required-mark {
    color: var(--color-danger);
    font-weight: 700;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    box-sizing: border-box;
}

.form-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

/* 联系方式网格 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: #fff;
}

.contact-icon.wechat-bg { background: #07C160; }
.contact-icon.qq-bg { background: #12B7F5; }
.contact-icon.ks-bg { background: #FF4906; }
.contact-icon.dy-bg { background: #FE2C55; }
.contact-icon.phone-bg { background: #6B7280; }

.contact-item .form-input {
    flex: 1;
    min-width: 0;
}

/* 提交按钮 */
.btn-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(79, 70, 229, 0.35);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.submit-hint {
    text-align: center;
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    margin-top: 8px;
}

/* ---- 步骤3: 成功 ---- */
.success-content {
    text-align: center;
}

.success-icon-wrapper {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: rgba(16, 185, 129, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    animation: bounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes bounceIn {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.success-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.success-text {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.token-display-box {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: left;
    margin-bottom: 24px;
}

.token-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.token-value-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.token-code {
    flex: 1;
    padding: 10px 14px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.82rem;
    color: var(--color-text);
    word-break: break-all;
}

.btn-copy {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.btn-copy:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}

.token-warning {
    font-size: 0.78rem;
    color: var(--color-warning);
    margin-top: 10px;
    display: flex;
    align-items: flex-start;
    gap: 6px;
    line-height: 1.4;
}

.btn-back-home {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    text-decoration: none;
    transition: all var(--transition);
}

.btn-back-home:hover {
    background: var(--color-bg);
    border-color: var(--color-text);
    transform: translateY(-1px);
}

/* ========== 分享给同学 ========== */
.share-section {
    margin-top: 20px;
    padding: 20px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px dashed var(--color-border);
}

.share-header-row {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.share-desc {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.share-msg-preview {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    text-align: left;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 120px;
    overflow-y: auto;
    margin-bottom: 12px;
}

.share-btn-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-share {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 100px;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-share-copy {
    color: var(--color-primary);
    background: var(--color-primary-subtle);
    border: 1px solid var(--color-primary-border);
}

.btn-share-copy:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-1px);
}

.btn-share-native {
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.2);
}

.btn-share-native:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
}

/* ---- 令牌弹窗 ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    max-width: 420px;
    width: 100%;
    position: relative;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(12px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--color-text);
    color: #fff;
    border-color: var(--color-text);
}

/* ========== 联系方式提示 ========== */
.contact-hint {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    margin: -6px 0 10px 0;
    padding-left: 24px;
}

/* ========== 状态卡片（验证身份后展示已有记录） ========== */
.status-card {
    text-align: center;
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    animation: fadeIn 0.35s ease;
}

.status-card-approved {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
    border: 1px solid #A7F3D0;
}

.status-card-pending {
    background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
    border: 1px solid #FCD34D;
}

.status-card-rejected {
    background: linear-gradient(135deg, #FEF2F2 0%, #FEE2E2 100%);
    border: 1px solid #FECACA;
}

.sc-header { margin-bottom: 16px; }
.sc-icon-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.sc-avatar-section {
    margin-bottom: 12px;
}
.sc-avatar {
    display: block;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin: 0 auto 8px;
}
.sc-avatar-placeholder {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    margin: 0 auto 8px;
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.sc-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 4px 0 0;
}

.sc-status-badge {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.sc-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.sc-motto {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    font-style: italic;
    margin-bottom: 12px;
}

/* 状态卡片-毕业寄语 */
.sc-graduation {
    max-width: 480px;
    margin: 0 auto 16px;
    padding: 14px 20px;
    background: rgba(255,255,255,0.7);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    text-align: left;
    position: relative;
}
.sc-graduation::before {
    content: '\201C';
    position: absolute;
    top: -8px;
    left: 6px;
    font-size: 2.2rem;
    color: var(--color-accent);
    opacity: 0.2;
    line-height: 1;
    font-family: Georgia, serif;
}

.sc-contacts {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 12px;
}
.sc-contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0;
    font-size: 0.82rem;
    background: #fff;
    border-radius: 100px;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.06);
}
.sc-contact-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 10px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #fff;
    min-width: 36px;
}
.sc-contact-label.wechat { background: #07C160; }
.sc-contact-label.qq     { background: #12B7F5; }
.sc-contact-label.ks     { background: #FF4906; }
.sc-contact-label.dy     { background: #FE2C55; }
.sc-contact-label.phone  { background: #6B7280; }
.sc-contact-val {
    padding: 4px 12px 4px 10px;
    color: var(--text-primary);
    font-weight: 500;
}

.sc-time {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    margin-bottom: 20px;
}

.sc-reject-reason {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--color-danger);
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: 8px;
    padding: 8px 16px;
    margin-bottom: 16px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
    line-height: 1.5;
}

.sc-actions {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}
.sc-actions .btn {
    padding: 10px 24px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all 0.2s;
}
.sc-actions .btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.sc-actions .btn-primary:hover {
    background: var(--color-accent-hover);
}
.sc-actions .btn-outline {
    background: #fff;
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.sc-actions .btn-outline:hover {
    background: var(--bg);
}

.sc-back-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: 8px;
    transition: all 0.2s;
}
.sc-back-btn:hover {
    color: var(--text-secondary);
    background: rgba(0,0,0,0.04);
}

/* 徽章颜色覆盖 */
.badge-pending { background: #FEF3C7; color: #D97706; }
.badge-approved { background: #D1FAE5; color: #059669; }
.badge-rejected { background: #FEE2E2; color: #DC2626; }

/* 管理后台适配：编辑弹窗表单字段 select */
#mfStatus {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--surface);
    color: var(--text-primary);
}

/* ============================================
   关于本站页面
   ============================================ */

/* -------- about 页面通用 section 覆盖 -------- */
.about-page .features {
    padding: 32px 0;
}
.about-page .features .section-title {
    margin-bottom: 20px;
    font-size: 1.6rem;
}
.about-page .features .section-label {
    margin-bottom: 10px;
}

/* ========================
   网站简介
   ======================== */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 28px;
    align-items: start;
    margin-top: 16px;
    padding: 24px 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.about-intro-content p {
    font-size: 0.93rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 10px;
}
.about-intro-content p:last-child { margin-bottom: 0; }
.about-intro-content strong {
    color: var(--color-text);
    font-weight: 600;
}

.about-intro-highlights {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--color-accent-subtle);
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    border: 1px solid var(--color-primary-border);
}
.highlight-item i { color: var(--color-accent); flex-shrink: 0; }

/* ========================
   数据统计卡片
   ======================== */
.about-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.about-stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 14px 16px;
    text-align: center;
    transition: all 0.3s ease;
}

.about-stat-card:hover {
    border-color: rgba(99,102,241,0.2);
    box-shadow: 0 4px 16px rgba(99,102,241,0.08);
    transform: translateY(-2px);
}

.about-stat-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(139,92,246,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 8px;
    color: var(--color-accent);
}

.about-stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text);
    font-family: var(--font-display);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 2px;
}

.about-stat-label {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    font-weight: 500;
}

/* ========================
   服务器状态
   ======================== */
.server-status-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 14px 20px;
    margin-top: 16px;
    box-shadow: var(--shadow-sm);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
}
.status-dot::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    animation: statusPulse 2s ease-in-out infinite;
}
.status-dot.status-online { background: var(--color-success); }
.status-dot.status-online::after { border: 1px solid rgba(16, 185, 129, 0.3); }
.status-dot.status-warning { background: var(--color-warning); }
.status-dot.status-warning::after { border: 1px solid rgba(245, 158, 11, 0.3); }
.status-dot.status-offline { background: var(--color-danger); }
.status-dot.status-offline::after { border: 1px solid rgba(239, 68, 68, 0.3); }

@keyframes statusPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.8); }
}

.status-indicator span {
    font-size: 0.9rem;
    font-weight: 600;
}

.status-time {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
}

.server-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 8px;
    margin-top: 10px;
}

.server-info-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
}
.server-info-item-ok { border-left: 3px solid var(--color-success); }
.server-info-item-error { border-left: 3px solid var(--color-danger); }

.server-info-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: var(--color-accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
    margin-top: 1px;
}

.server-info-body {
    flex: 1;
    min-width: 0;
}

.server-info-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.7rem;
    color: var(--color-text-tertiary);
    font-weight: 600;
    margin-bottom: 3px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.server-status-badge {
    display: inline-block;
    font-size: 0.65rem;
    padding: 1px 6px;
    border-radius: 100px;
    font-weight: 600;
    letter-spacing: 0;
    text-transform: none;
}
.badge-ok { background: #D1FAE5; color: #059669; }
.badge-error { background: #FEE2E2; color: #DC2626; }

.server-info-value {
    font-size: 0.8rem;
    color: var(--color-text);
    font-weight: 500;
    word-break: break-all;
    line-height: 1.35;
}

/* ========================
   技术栈 · 流水线
   ======================== */
.tech-pipeline {
    display: flex;
    align-items: stretch;
    margin-top: 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    flex-wrap: wrap;
}

.tech-pipeline-item {
    flex: 1 1 150px;
    min-width: 140px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    position: relative;
}
.tech-pipeline-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 25%;
    height: 50%;
    width: 1px;
    background: var(--color-border);
}

.tech-pipeline-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: #fff;
}
.tech-pipeline-dot.c1 { background: linear-gradient(135deg, #6366F1, #818CF8); }
.tech-pipeline-dot.c2 { background: linear-gradient(135deg, #8B5CF6, #A78BFA); }
.tech-pipeline-dot.c3 { background: linear-gradient(135deg, #EC4899, #F472B6); }
.tech-pipeline-dot.c4 { background: linear-gradient(135deg, #06B6D4, #22D3EE); }
.tech-pipeline-dot.c5 { background: linear-gradient(135deg, #F59E0B, #FBBF24); }
.tech-pipeline-dot.c6 { background: linear-gradient(135deg, #10B981, #34D399); }

.tech-pipeline-dot i {
    width: 16px;
    height: 16px;
}

.tech-pipeline-info {
    min-width: 0;
}
.tech-pipeline-info strong {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}
.tech-pipeline-info span {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

/* ============================================
   响应式
   ============================================ */

/* ≥1200px: 保持默认（无需额外覆盖） */

/* 992-1199px */
@media (max-width: 1199px) {
    .about-page .features { padding: 26px 0; }
    .about-page .features .section-title { font-size: 1.5rem; margin-bottom: 16px; }
    .about-intro { padding: 20px 22px; gap: 22px; grid-template-columns: 1fr 200px; }
    .about-intro-content p { font-size: 0.9rem; }
    .about-stats-grid { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 8px; }
    .about-stat-value { font-size: 1.4rem; }
    .about-page .features-grid { gap: 12px; max-width: 100%; }
    .about-page .feature-card { padding: 20px 22px; gap: 16px; }
    .about-page .feature-card .card-icon-wrap { width: 40px; height: 40px; }
    .about-page .feature-card .card-content h3 { font-size: 0.98rem; }
    .about-page .feature-card .card-content p { font-size: 0.82rem; }
}

/* 768-991px */
@media (max-width: 991px) {
    .about-page .features { padding: 22px 0; }
    .about-page .features .section-title { font-size: 1.4rem; margin-bottom: 14px; }
    .about-page .features .section-label { font-size: 0.75rem; margin-bottom: 6px; }
    .about-intro { padding: 18px 18px; gap: 18px; grid-template-columns: 1fr; }
    .about-intro-content p { font-size: 0.87rem; line-height: 1.6; }
    .about-intro-highlights { flex-direction: row; flex-wrap: wrap; }
    .highlight-item { flex: 1 1 calc(50% - 3px); min-width: 140px; }
    .about-stats-grid { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; }
    .about-stat-card { padding: 16px 10px 14px; }
    .about-stat-value { font-size: 1.3rem; }
    .about-stat-icon { width: 28px; height: 28px; margin-bottom: 6px; }
    .about-stat-label { font-size: 0.72rem; }
    .server-info-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 6px; }
    .server-info-item { padding: 10px 12px; }
    .server-status-banner { padding: 12px 16px; }
    .tech-pipeline { flex-direction: column; }
    .tech-pipeline-item { padding: 10px 14px; gap: 8px; }
    .tech-pipeline-item:not(:last-child)::after {
        top: auto; bottom: 0;
        left: 14px; right: 14px;
        width: auto; height: 1px;
    }
    /* 网站功能：平板端保持双列但缩小间距 */
    .about-page .features-grid { gap: 10px; max-width: 100%; }
    .about-page .feature-card { padding: 16px 18px; gap: 14px; }
    .about-page .feature-card .card-icon-wrap { width: 36px; height: 36px; }
    .about-page .feature-card .card-content h3 { font-size: 0.92rem; }
    .about-page .feature-card .card-content p { font-size: 0.78rem; }
}

/* 576-767px */
@media (max-width: 767px) {
    .about-page .features { padding: 18px 0; }
    .about-page .features .section-title { font-size: 1.3rem; margin-bottom: 12px; }
    .about-intro { padding: 16px 14px; gap: 14px; }
    .about-intro-content p { font-size: 0.85rem; }
    .about-stats-grid { grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 12px; }
    .about-stat-card { padding: 14px 6px 12px; }
    .about-stat-value { font-size: 1.2rem; }
    .about-stat-icon { width: 26px; height: 26px; border-radius: 6px; }
    .about-stat-label { font-size: 0.7rem; }
    .server-info-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 6px; }
    .server-info-item { padding: 8px 10px; gap: 8px; }
    .server-info-icon { width: 24px; height: 24px; }
    .server-info-label { font-size: 0.65rem; }
    .server-info-value { font-size: 0.75rem; }
    .server-status-banner { padding: 10px 14px; flex-direction: column; align-items: flex-start; }
    .tech-pipeline-item { padding: 8px 12px; gap: 6px; }
    .tech-pipeline-dot { width: 26px; height: 26px; }
    .tech-pipeline-info strong { font-size: 0.8rem; }
    .tech-pipeline-info span { font-size: 0.7rem; }
    /* 网站功能：手机端切换为单列 */
    .about-page .features-grid { grid-template-columns: 1fr; gap: 8px; max-width: 100%; }
    .about-page .feature-card { padding: 14px 16px; gap: 12px; border-radius: var(--radius); }
    .about-page .feature-card .card-icon-wrap { width: 36px; height: 36px; border-radius: var(--radius-sm); }
    .about-page .feature-card .card-content h3 { font-size: 0.9rem; }
    .about-page .feature-card .card-content p { font-size: 0.78rem; line-height: 1.45; }
}

/* ≤575px */
@media (max-width: 575px) {
    .about-page .features { padding: 14px 0; }
    .about-page .features .section-title { font-size: 1.2rem; margin-bottom: 10px; }
    .about-intro { padding: 14px 10px; gap: 12px; border-radius: var(--radius); }
    .about-intro-content p { font-size: 0.82rem; margin-bottom: 8px; line-height: 1.55; }
    .about-intro-highlights { flex-direction: column; gap: 4px; }
    .highlight-item { flex: 1 1 100%; padding: 8px 10px; font-size: 0.8rem; }
    .about-stats-grid { grid-template-columns: repeat(3, 1fr); gap: 5px; margin-top: 10px; }
    .about-stat-card { padding: 12px 4px 10px; }
    .about-stat-value { font-size: 1.1rem; }
    .about-stat-icon { width: 24px; height: 24px; border-radius: 5px; margin-bottom: 4px; }
    .about-stat-label { font-size: 0.66rem; }
    .server-info-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 5px; }
    .server-info-item { padding: 8px 10px; }
    .server-info-value { font-size: 0.73rem; }
    .server-status-banner { margin-top: 10px; padding: 10px 12px; }
    .status-dot { width: 8px; height: 8px; }
    .status-indicator span { font-size: 0.82rem; }
    .tech-pipeline { margin-top: 10px; }
    .tech-pipeline-item { padding: 8px 10px; gap: 6px; }
    .tech-pipeline-dot { width: 24px; height: 24px; }
    .tech-pipeline-dot i { width: 13px; height: 13px; }
    .tech-pipeline-info strong { font-size: 0.76rem; margin-bottom: 1px; }
    .tech-pipeline-info span { font-size: 0.68rem; line-height: 1.3; }
    /* 网站功能：最小屏单列进一步压缩 */
    .about-page .features-grid { grid-template-columns: 1fr; gap: 6px; }
    .about-page .feature-card { padding: 12px 12px; gap: 10px; }
    .about-page .feature-card .card-icon-wrap { width: 32px; height: 32px; }
    .about-page .feature-card .card-content h3 { font-size: 0.84rem; }
    .about-page .feature-card .card-content p { font-size: 0.73rem; line-height: 1.4; }
}