/* ============================================================
   FIT 展览馆 - 主样式表
   包含：视差效果 · 粒子背景 · 3D卡片 · 滚动动画
   ============================================================ */

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

:root {
    --primary: #4a6cf7;
    --primary-dark: #3451d1;
    --primary-light: #e8edff;
    --primary-glow: rgba(74, 108, 247, 0.3);
    --accent: #ff6b6b;
    --accent-hover: #e85a5a;
    --gold: #f5a623;
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #2d3436;
    --text-light: #636e72;
    --text-muted: #b2bec3;
    --border: #e1e4e8;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --header-height: 64px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    --hero-gradient-start: #0f0c29;
    --hero-gradient-mid: #302b63;
    --hero-gradient-end: #24243e;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    padding-top: 0;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    position: relative;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 粒子画布 ===== */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.15;
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }

.logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.25rem; font-weight: 700; color: var(--primary);
}

.logo i { font-size: 1.5rem; animation: logoFloat 3s ease-in-out infinite; }

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.nav { display: flex; gap: 4px; }

.nav-link {
    text-decoration: none; color: var(--text-light); padding: 8px 18px;
    border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 500;
    transition: var(--transition); display: flex; align-items: center; gap: 6px; position: relative;
}

.nav-link::after {
    content: "";
    position: absolute; bottom: 2px; left: 50%; width: 0; height: 2px;
    background: var(--primary); border-radius: 1px;
    transition: var(--transition); transform: translateX(-50%);
}

.nav-link:hover::after, .nav-link.active::after { width: 60%; }

.nav-link:hover { background: var(--primary-light); color: var(--primary); }

.nav-link.active { background: var(--primary); color: #fff; }

.nav-link.active::after { display: none; }

.nav-link i { font-size: 0.9rem; }

.menu-toggle {
    display: none; background: none; border: none; cursor: pointer;
    padding: 8px; flex-direction: column; gap: 5px;
}

.menu-toggle span {
    display: block; width: 24px; height: 2.5px;
    background: var(--text); border-radius: 2px; transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
/* ===== 视差 Hero 区 ===== */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center;
    overflow: hidden; padding: 100px 20px 60px;
}

.hero-bg {
    position: absolute; inset: -100px;
    background: linear-gradient(135deg, var(--hero-gradient-start) 0%, var(--hero-gradient-mid) 50%, var(--hero-gradient-end) 100%);
    z-index: -2; will-change: transform;
}

.hero-bg::before {
    content: "";
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(74, 108, 247, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 107, 107, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(245, 166, 35, 0.08) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { opacity: 0.6; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}

.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(240,242,245,0.03) 60%, var(--bg) 100%);
    z-index: -1;
}

.hero-content { position: relative; z-index: 2; text-align: center; max-width: 700px; }

.hero-badge {
    display: inline-block; padding: 6px 20px; border-radius: 20px; font-size: 0.8rem; font-weight: 600;
    color: rgba(255,255,255,0.9); background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15); backdrop-filter: blur(4px);
    margin-bottom: 24px; letter-spacing: 2px; text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.8rem, 8vw, 5.5rem); font-weight: 800; line-height: 1.1; margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, #a8b8ff 40%, #ffa8b8 70%, #fff 100%);
    background-size: 200% auto; -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; animation: gradientText 4s ease infinite;
}

@keyframes gradientText {
    0% { background-position: 0% center; }
    50% { background-position: 100% center; }
    100% { background-position: 0% center; }
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem); color: rgba(255,255,255,0.7);
    margin-bottom: 40px; font-weight: 400; letter-spacing: 1px;
}

.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-primary, .btn-outline {
    display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 12px;
    font-size: 1rem; font-weight: 600; text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1); cursor: pointer; position: relative; overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #6c63ff 100%);
    color: #fff; box-shadow: 0 4px 20px rgba(74,108,247,0.4);
}

.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(74,108,247,0.5); }

.btn-primary::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.15) 50%, transparent 70%);
    transform: translateX(-100%); transition: transform 0.6s;
}

.btn-primary:hover::after { transform: translateX(100%); }

.btn-outline {
    background: transparent; color: rgba(255,255,255,0.9);
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    border-color: rgba(255,255,255,0.6); background: rgba(255,255,255,0.08); transform: translateY(-3px);
}

/* 浮动形状 */
.hero-shapes { position: absolute; inset: 0; overflow: hidden; z-index: 0; pointer-events: none; }

.shape { position: absolute; border-radius: 50%; opacity: 0.15; will-change: transform; }

.shape-1 { width: 300px; height: 300px; background: var(--primary); top: 10%; left: -5%; animation: shapeFloat1 20s ease-in-out infinite; }
.shape-2 { width: 200px; height: 200px; background: var(--accent); top: 60%; right: -3%; animation: shapeFloat2 25s ease-in-out infinite; border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
.shape-3 { width: 150px; height: 150px; background: var(--gold); top: 20%; right: 15%; animation: shapeFloat3 18s ease-in-out infinite; border-radius: 40% 60% 65% 35% / 40% 45% 55% 60%; }
.shape-4 { width: 100px; height: 100px; background: #6c63ff; bottom: 25%; left: 10%; animation: shapeFloat1 22s ease-in-out infinite reverse; border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
.shape-5 { width: 80px; height: 80px; background: #48dbfb; top: 40%; left: 25%; animation: shapeFloat2 15s ease-in-out infinite; border-radius: 50%; }
.shape-6 { width: 120px; height: 120px; border: 2px solid rgba(255,255,255,0.1); background: transparent; bottom: 10%; right: 25%; animation: shapeFloat3 28s ease-in-out infinite reverse; border-radius: 30% 70% 50% 50%; }

@keyframes shapeFloat1 {
    0%, 100% { transform: translate(0,0) rotate(0deg) scale(1); }
    33% { transform: translate(30px,-40px) rotate(120deg) scale(1.05); }
    66% { transform: translate(-20px,20px) rotate(240deg) scale(0.95); }
}
@keyframes shapeFloat2 {
    0%, 100% { transform: translate(0,0) rotate(0deg); }
    50% { transform: translate(-40px,-30px) rotate(180deg); }
}
@keyframes shapeFloat3 {
    0%, 100% { transform: translate(0,0) scale(1); }
    50% { transform: translate(20px,-50px) scale(1.1); }
}

/* 滚动提示 */
.scroll-hint {
    position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 8px; z-index: 2;
}
.scroll-text { font-size: 0.75rem; color: rgba(255,255,255,0.4); letter-spacing: 3px; text-transform: uppercase; }
.scroll-line {
    width: 1px; height: 40px;
    background: linear-gradient(180deg, rgba(255,255,255,0.5), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%, 100% { transform: scaleY(0.5); opacity: 0.5; }
    50% { transform: scaleY(1); opacity: 1; }
}

/* ===== Sections (通用) ===== */
.main { position: relative; z-index: 1; background: var(--bg); }

.section { display: none; padding: 60px 0 80px; animation: sectionFadeIn 0.5s ease; }
.section.active { display: block; }
@keyframes sectionFadeIn { from { opacity: 0; } to { opacity: 1; } }

.section-header { text-align: center; margin-bottom: 36px; }
.section-header h2 {
    font-size: clamp(1.3rem, 3vw, 1.8rem); font-weight: 700; color: var(--text); margin-bottom: 12px;
}
.section-header h2 i {
    background: linear-gradient(135deg, var(--primary), #6c63ff);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-right: 8px;
}
.section-divider {
    width: 60px; height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px; margin: 0 auto 14px; transition: width 0.6s ease;
}
.section-desc { color: var(--text-light); font-size: 0.95rem; max-width: 500px; margin: 0 auto; }

/* ===== Filter Bar ===== */
.filter-bar { display: flex; justify-content: center; gap: 8px; margin-bottom: 30px; flex-wrap: wrap; }
.filter-btn {
    padding: 8px 20px; border: 2px solid var(--border); background: var(--card-bg);
    border-radius: 24px; font-size: 0.85rem; font-weight: 500; color: var(--text-light);
    cursor: pointer; transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    font-family: var(--font); position: relative; overflow: hidden;
}
.filter-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); transform: translateY(-1px); }
.filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 4px 15px var(--primary-glow); }

/* ===== Gallery Grid (Masonry) ===== */
.gallery-grid { column-count: 4; column-gap: 16px; }
.gallery-item {
    break-inside: avoid; margin-bottom: 16px; background: var(--card-bg); border-radius: var(--radius);
    overflow: hidden; box-shadow: var(--shadow); cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1); position: relative;
    transform-style: preserve-3d; perspective: 1000px;
}
.gallery-item:hover { box-shadow: 0 20px 60px rgba(0,0,0,0.15); transform: translateY(-8px) scale(1.02); }
.gallery-item .img-wrap { width: 100%; overflow: hidden; position: relative; }
.gallery-item .img-wrap img { width: 100%; display: block; transition: transform 0.6s cubic-bezier(0.4,0,0.2,1); }
.gallery-item:hover .img-wrap img { transform: scale(1.08); }
.gallery-item .work-info { padding: 14px 16px 16px; position: relative; z-index: 1; background: var(--card-bg); }
.gallery-item .work-title { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: var(--transition); }
.gallery-item:hover .work-title { color: var(--primary); }
.gallery-item .work-author { font-size: 0.8rem; color: var(--text-light); display: flex; align-items: center; gap: 4px; }
.gallery-item .work-author i { font-size: 0.75rem; }
.gallery-item .vote-badge { display: inline-flex; align-items: center; gap: 4px; background: var(--primary-light); color: var(--primary); padding: 3px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; margin-top: 8px; transition: var(--transition); }
.gallery-item:hover .vote-badge { background: rgba(74,108,247,0.15); }
/* ===== Video Grid ===== */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.video-item {
    background: var(--card-bg); border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow); cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    transform-style: preserve-3d; perspective: 1000px;
}
.video-item:hover { box-shadow: 0 20px 60px rgba(0,0,0,0.15); transform: translateY(-8px) scale(1.02); }
.video-item .video-thumb { position: relative; width: 100%; aspect-ratio: 16/9; overflow: hidden; background: #000; }
.video-item .video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.4,0,0.2,1); }
.video-item:hover .video-thumb img { transform: scale(1.08); }
.video-item .play-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,0.25); transition: all 0.4s cubic-bezier(0.4,0,0.2,1); }
.video-item:hover .play-overlay { background: rgba(0,0,0,0.4); }
.video-item .play-overlay i { font-size: 3.2rem; color: #fff; opacity: 0.9; filter: drop-shadow(0 2px 12px rgba(0,0,0,0.4)); transition: transform 0.5s cubic-bezier(0.68,-0.55,0.265,1.55); }
.video-item:hover .play-overlay i { transform: scale(1.15); }
.video-item .video-info { padding: 14px 16px 16px; position: relative; z-index: 1; background: var(--card-bg); }
.video-item .video-title { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: var(--transition); }
.video-item:hover .video-title { color: var(--primary); }
.video-item .video-author { font-size: 0.8rem; color: var(--text-light); display: flex; align-items: center; gap: 4px; }
.video-item .vote-badge { display: inline-flex; align-items: center; gap: 4px; background: var(--primary-light); color: var(--primary); padding: 3px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; margin-top: 8px; transition: var(--transition); }
.video-item:hover .vote-badge { background: rgba(74,108,247,0.15); }

/* ===== Ranking ===== */
.ranking-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 28px; }
.ranking-tab { padding: 10px 28px; border: 2px solid var(--border); background: var(--card-bg); border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 600; color: var(--text-light); cursor: pointer; transition: all 0.3s cubic-bezier(0.4,0,0.2,1); font-family: var(--font); position: relative; }
.ranking-tab:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-1px); }
.ranking-tab.active { background: linear-gradient(135deg, var(--gold), #f7c948); color: #fff; border-color: transparent; box-shadow: 0 4px 15px rgba(245,166,35,0.3); }
.ranking-list { max-width: 700px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.ranking-item { display: flex; align-items: center; gap: 16px; background: var(--card-bg); border-radius: var(--radius); padding: 14px 18px; box-shadow: var(--shadow); transition: all 0.3s cubic-bezier(0.4,0,0.2,1); cursor: pointer; position: relative; overflow: hidden; }
.ranking-item::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--border); border-radius: 0 2px 2px 0; transition: var(--transition); }
.ranking-item:nth-child(1)::before { background: var(--gold); }
.ranking-item:nth-child(2)::before { background: #b0bec5; }
.ranking-item:nth-child(3)::before { background: #a1887f; }
.ranking-item:hover { box-shadow: var(--shadow-hover); transform: translateX(6px); }
.ranking-number { width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; border-radius: 50%; font-weight: 700; font-size: 1rem; flex-shrink: 0; transition: transform 0.5s cubic-bezier(0.68,-0.55,0.265,1.55); }
.ranking-item:hover .ranking-number { transform: scale(1.15); }
.ranking-item:nth-child(1) .ranking-number { background: linear-gradient(135deg, var(--gold), #f7c948); color: #fff; box-shadow: 0 4px 12px rgba(245,166,35,0.3); }
.ranking-item:nth-child(2) .ranking-number { background: linear-gradient(135deg, #b0bec5, #cfd8dc); color: #fff; }
.ranking-item:nth-child(3) .ranking-number { background: linear-gradient(135deg, #a1887f, #bcaaa4); color: #fff; }
.ranking-item:nth-child(n+4) .ranking-number { background: var(--primary-light); color: var(--primary); }
.ranking-thumb { width: 60px; height: 60px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; }
.ranking-thumb img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.ranking-item:hover .ranking-thumb img { transform: scale(1.08); }
.ranking-info { flex: 1; min-width: 0; }
.ranking-info .ranking-name { font-weight: 600; font-size: 0.9rem; margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ranking-info .ranking-author { font-size: 0.78rem; color: var(--text-light); }
.ranking-votes { display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: 0.95rem; color: var(--accent); white-space: nowrap; }
.ranking-votes i { font-size: 0.9rem; transition: transform 0.5s cubic-bezier(0.68,-0.55,0.265,1.55); }
.ranking-item:hover .ranking-votes i { transform: scale(1.2); }

/* ===== Modal ===== */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); z-index: 2000; padding: 20px; align-items: center; justify-content: center; }
.modal-overlay.open { display: flex; }
.modal-content { background: var(--card-bg); border-radius: var(--radius-lg); max-width: 800px; width: 100%; max-height: 90vh; overflow-y: auto; position: relative; animation: modalIn 0.4s cubic-bezier(0.4,0,0.2,1); box-shadow: 0 30px 80px rgba(0,0,0,0.3); }
@keyframes modalIn { from { opacity: 0; transform: scale(0.9) translateY(20px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.modal-close { position: absolute; top: 14px; right: 14px; width: 38px; height: 38px; border-radius: 50%; border: none; background: rgba(0,0,0,0.06); color: var(--text); font-size: 1rem; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.3s ease; z-index: 10; }
.modal-close:hover { background: rgba(0,0,0,0.12); transform: rotate(90deg); }
.modal-body { padding: 0; }
.modal-body .modal-img { width: 100%; display: block; border-radius: var(--radius-lg) var(--radius-lg) 0 0; max-height: 60vh; object-fit: contain; background: #f8f8f8; }
.modal-body .modal-video { width: 100%; aspect-ratio: 16/9; display: block; border-radius: var(--radius-lg) var(--radius-lg) 0 0; background: #000; }
.modal-detail { padding: 28px; }
.modal-detail .modal-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 6px; }
.modal-detail .modal-meta { display: flex; align-items: center; gap: 16px; margin-bottom: 14px; font-size: 0.85rem; color: var(--text-light); flex-wrap: wrap; }
.modal-detail .modal-meta span { display: flex; align-items: center; gap: 4px; }
.modal-detail .modal-desc { font-size: 0.95rem; line-height: 1.7; color: var(--text); margin-bottom: 24px; }
.modal-vote-btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 32px; border: none; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 600; cursor: pointer; transition: all 0.3s cubic-bezier(0.4,0,0.2,1); font-family: var(--font); background: linear-gradient(135deg, var(--accent), #ff8787); color: #fff; box-shadow: 0 4px 16px rgba(255,107,107,0.3); position: relative; overflow: hidden; }
.modal-vote-btn:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(255,107,107,0.4); }
.modal-vote-btn:active:not(:disabled) { transform: translateY(0); }
.modal-vote-btn.voted { background: var(--text-muted); cursor: default; box-shadow: none; transform: none; }
.modal-vote-btn i { font-size: 1.1rem; }
.modal-vote-count { display: inline-block; margin-left: 12px; font-size: 0.9rem; color: var(--text-light); }

/* ===== Toast ===== */
.toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(100px); padding: 14px 32px; border-radius: var(--radius-sm); background: var(--text); color: #fff; font-size: 0.9rem; font-weight: 500; z-index: 3000; opacity: 0; transition: all 0.4s cubic-bezier(0.4,0,0.2,1); pointer-events: none; box-shadow: 0 8px 30px rgba(0,0,0,0.2); white-space: nowrap; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { background: linear-gradient(135deg, #27ae60, #2ecc71); }
.toast.error { background: linear-gradient(135deg, var(--accent), #ff8787); }

/* ===== Footer ===== */
.footer { background: var(--text); color: rgba(255,255,255,0.6); text-align: center; padding: 40px 0 30px; font-size: 0.85rem; position: relative; z-index: 1; }
.footer p { margin-bottom: 4px; }
.footer-sub { color: rgba(255,255,255,0.35); font-size: 0.8rem; }

/* ===== 滚动触发动画 (Scroll Reveal) ===== */
[data-reveal] { opacity: 0; transition: all 0.7s cubic-bezier(0.4,0,0.2,1); }
[data-reveal="revealed"] { opacity: 1; }
[data-reveal="fade-up"] { transform: translateY(40px); }
[data-reveal="revealed"][data-reveal="fade-up"] { transform: translateY(0); }
[data-reveal="fade-left"] { transform: translateX(-40px); }
[data-reveal="revealed"][data-reveal="fade-left"] { transform: translateX(0); }
[data-reveal="fade-right"] { transform: translateX(40px); }
[data-reveal="revealed"][data-reveal="fade-right"] { transform: translateX(0); }
[data-reveal="zoom-in"] { transform: scale(0.85); }
[data-reveal="revealed"][data-reveal="zoom-in"] { transform: scale(1); }
[data-reveal][data-delay] { transition-delay: calc(var(--d, 0) * 1ms); }
.section[id] { scroll-margin-top: calc(var(--header-height) + 20px); }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state i { font-size: 3rem; margin-bottom: 16px; }
.empty-state p { font-size: 1rem; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* ===== Responsive ===== */
@media (max-width: 992px) { .gallery-grid { column-count: 3; } }

@media (max-width: 768px) {
    .gallery-grid { column-count: 2; column-gap: 12px; }
    .gallery-item { margin-bottom: 12px; }
    .video-grid { grid-template-columns: 1fr; }
    .section-header h2 { font-size: 1.4rem; }
    .section { padding: 40px 0 60px; }
    .nav { position: fixed; top: var(--header-height); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); flex-direction: column; padding: 12px 16px; box-shadow: 0 4px 20px rgba(0,0,0,0.1); display: none; }
    .nav.open { display: flex; }
    .nav-link { padding: 12px 16px; font-size: 0.95rem; }
    .nav-link::after { display: none; }
    .menu-toggle { display: flex; }
    .modal-content { max-height: 85vh; margin: 10px; }
    .modal-detail { padding: 20px; }
    .modal-detail .modal-title { font-size: 1.1rem; }
    .ranking-item { padding: 12px 14px; gap: 12px; }
    .ranking-thumb { width: 48px; height: 48px; }
    .filter-btn { font-size: 0.8rem; padding: 6px 14px; }
    .hero { min-height: 90vh; padding: 80px 16px 40px; }
    .hero-cta { flex-direction: column; align-items: center; }
    .btn-primary, .btn-outline { width: 100%; max-width: 280px; justify-content: center; }
}

@media (max-width: 480px) {
    .gallery-grid { column-count: 2; column-gap: 8px; }
    .gallery-item { margin-bottom: 8px; }
    .gallery-item .work-info { padding: 10px 12px 12px; }
    .container { padding: 0 12px; }
    .section-header h2 { font-size: 1.2rem; }
    .ranking-votes { font-size: 0.85rem; }
    .modal-detail { padding: 16px; }
}

/* ===== 降低动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    [data-reveal] { opacity: 1 !important; transform: none !important; }
    .gallery-item:hover, .video-item:hover { transform: none !important; }
}