/* =============================================
   91网 - 主样式文件 (Modern Minimal High-end)
   ============================================= */

/* ---- CSS 变量 ---- */
:root {
  --primary: #0a2540;
  --accent: #1677ff;
  --accent-light: #e8f1ff;
  --text-main: #1a1a2e;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --bg-white: #ffffff;
  --bg-light: #f8f9fb;
  --bg-dark: #0a2540;
  --border: #e5e7eb;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(10,37,64,0.08);
  --shadow-hover: 0 8px 40px rgba(10,37,64,0.14);
  --transition: all 0.28s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  color: var(--text-main);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---- 容器 ---- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 顶部导航 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--primary);
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), #0050d8);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
  font-weight: 800;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.93rem;
  color: var(--text-muted);
  transition: var(--transition);
  font-weight: 500;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--accent);
  background: var(--accent-light);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.btn-post {
  background: var(--accent);
  color: #fff;
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
}
.btn-post:hover { background: #0050d8; transform: translateY(-1px); }

/* ---- 搜索框 ---- */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-inner {
  display: flex;
  align-items: center;
  max-width: 640px;
  margin: 0 auto;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 30px;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(10,37,64,0.05);
}
.search-inner:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(22,119,255,0.12);
}
.search-inner input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 18px;
  font-size: 0.95rem;
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-main);
}
.search-inner input::placeholder { color: var(--text-light); }
.search-btn {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 0 28px 28px 0;
  transition: var(--transition);
}
.search-btn:hover { background: #0050d8; }

/* ---- Hero Banner ---- */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0a2540 0%, #1a3a5c 60%, #0050d8 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  object-fit: cover;
  opacity: 0.18;
  width: 100%;
  height: 100%;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  padding: 80px 0;
}
.hero-tag {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.9);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 30px;
  padding: 5px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}
.hero h1 span { color: #60a5fa; }
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.78);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(22,119,255,0.4);
}
.btn-primary:hover { background: #0050d8; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(22,119,255,0.5); }
.btn-outline {
  background: transparent;
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.4);
  transition: var(--transition);
}
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.7); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.hero-stat-item { text-align: left; }
.hero-stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}
.hero-stat-label { font-size: 0.82rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ---- 通用 Section ---- */
.section { padding: 80px 0; }
.section-sm { padding: 56px 0; }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-light { background: var(--bg-light); }
.section-header { text-align: center; margin-bottom: 52px; }
.section-tag {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 30px;
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.section-dark .section-title { color: #fff; }
.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin-top: 12px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.section-dark .section-subtitle { color: rgba(255,255,255,0.6); }

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-light);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.85);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 22px; height: 22px; fill: var(--accent); margin-left: 3px; }
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.04em;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-body { padding: 16px; }
.video-title {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.8rem;
  color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 13px; height: 13px; }

/* ---- 板块分类 ---- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.category-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.category-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  transform: scaleX(0);
  transition: var(--transition);
}
.category-card:hover { border-color: var(--accent); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.category-card:hover::before { transform: scaleX(1); }
.cat-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.4rem;
}
.cat-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.cat-desc {
  font-size: 0.87rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.cat-count {
  margin-top: 14px;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
}

/* ---- 数据统计 ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat-item {
  background: #fff;
  padding: 40px 24px;
  text-align: center;
}
.stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---- 用户评价 ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.review-quote {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 3rem;
  color: var(--accent-light);
  line-height: 1;
  font-family: Georgia, serif;
}
.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
}
.review-stars span { color: #f59e0b; font-size: 0.95rem; }
.review-text {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}
.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
}
.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}
.reviewer-name {
  font-size: 0.93rem;
  font-weight: 700;
  color: var(--text-main);
}
.reviewer-role { font-size: 0.8rem; color: var(--text-light); }

/* ---- FAQ ---- */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  text-align: left;
  padding: 22px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-main);
}
.faq-question:hover { color: var(--accent); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  font-size: 1.1rem;
  color: var(--text-muted);
}
.faq-item.open .faq-icon { background: var(--accent-light); color: var(--accent); transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.38s ease, padding 0.28s ease;
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding-bottom: 20px; }

/* ---- 加入我们 ---- */
.join-section {
  background: linear-gradient(135deg, #0a2540, #1a3a5c);
  border-radius: 20px;
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.join-section::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(22,119,255,0.25), transparent 70%);
}
.join-section h2 {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.join-section p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 32px;
  font-size: 1rem;
}
.join-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}
.join-form input {
  flex: 1;
  min-width: 200px;
  padding: 13px 20px;
  border-radius: 8px;
  border: 1.5px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: #fff;
  font-size: 0.95rem;
  font-family: var(--font-main);
  outline: none;
  transition: var(--transition);
}
.join-form input::placeholder { color: rgba(255,255,255,0.5); }
.join-form input:focus { border-color: rgba(255,255,255,0.5); background: rgba(255,255,255,0.15); }
.join-form button {
  background: var(--accent);
  color: #fff;
  padding: 13px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: var(--transition);
  font-family: var(--font-main);
  cursor: pointer;
}
.join-form button:hover { background: #0050d8; transform: translateY(-1px); }

/* ---- 页脚 ---- */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 56px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.7; color: rgba(255,255,255,0.55); max-width: 260px; }
.footer-col h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 0.83rem; color: rgba(255,255,255,0.4); }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 34px;
  height: 34px;
  background: rgba(255,255,255,0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  transition: var(--transition);
}
.footer-social a:hover { background: var(--accent); color: #fff; }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.85rem;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a { color: var(--text-muted); transition: var(--transition); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--border); }

/* ---- 话题列表 ---- */
.topic-list { display: flex; flex-direction: column; gap: 1px; background: var(--border); border-radius: var(--radius); overflow: hidden; }
.topic-item {
  background: #fff;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}
.topic-item:hover { background: var(--bg-light); }
.topic-num {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-light);
  flex-shrink: 0;
}
.topic-item:nth-child(1) .topic-num { background: #fef3c7; color: #d97706; }
.topic-item:nth-child(2) .topic-num { background: #f3f4f6; color: #6b7280; }
.topic-item:nth-child(3) .topic-num { background: #fef3c7; color: #92400e; }
.topic-info { flex: 1; min-width: 0; }
.topic-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topic-title a:hover { color: var(--accent); }
.topic-meta-row { display: flex; align-items: center; gap: 12px; font-size: 0.8rem; color: var(--text-light); }
.topic-stats { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-light); flex-shrink: 0; }
.topic-stats span { display: flex; align-items: center; gap: 4px; }

/* ---- 排行榜 ---- */
.ranking-table {
  width: 100%;
  border-collapse: collapse;
}
.ranking-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--border);
}
.ranking-table td {
  padding: 14px 16px;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.ranking-table tr:last-child td { border-bottom: none; }
.ranking-table tr:hover td { background: var(--bg-light); }
.rank-badge {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 800;
  background: var(--bg-light);
  color: var(--text-muted);
}
.rank-badge.gold { background: #fef3c7; color: #d97706; }
.rank-badge.silver { background: #f3f4f6; color: #6b7280; }
.rank-badge.bronze { background: #fef3c7; color: #92400e; }

/* ---- 内页 Banner ---- */
.inner-banner {
  background: linear-gradient(135deg, #0a2540, #1a3a5c);
  padding: 56px 0;
  text-align: center;
}
.inner-banner h1 {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}
.inner-banner p { color: rgba(255,255,255,0.65); font-size: 1rem; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .hero { min-height: 420px; }
  .hero-content { padding: 60px 0; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .category-grid { grid-template-columns: 1fr 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .join-section { padding: 40px 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 56px 0; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-stats { display: none; }
}

/* ---- 汉堡菜单 ---- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}
@media (max-width: 768px) {
  .hamburger { display: flex; }
}

/* ---- 移动端导航 ---- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
}
.mobile-nav.open { display: block; }
.mobile-nav-panel {
  position: absolute;
  top: 0; right: 0;
  width: 280px;
  height: 100%;
  background: #fff;
  padding: 24px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}
.mobile-nav.open .mobile-nav-panel { transform: translateX(0); }
.mobile-nav-panel a {
  display: block;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
}
.mobile-nav-close {
  position: absolute;
  top: 16px; right: 16px;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  background: none;
  border: none;
}

/* ---- 动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ---- 搜索结果提示 ---- */
.search-tip {
  display: none;
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-hover);
  padding: 16px;
  z-index: 50;
  margin-top: 6px;
}
.search-tip p { font-size: 0.9rem; color: var(--text-muted); text-align: center; padding: 8px 0; }

/* ---- 视频播放模态 ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 300;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: -40px; right: 0;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  background: none;
  border: none;
}
.video-placeholder {
  aspect-ratio: 16/9;
  background: #111;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  color: rgba(255,255,255,0.6);
  font-size: 0.95rem;
}
.video-placeholder .big-play {
  width: 72px; height: 72px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.video-placeholder .big-play svg { width: 28px; height: 28px; fill: #fff; margin-left: 4px; }