/* ===== 探花 - 主样式文件 ===== */
/* 版权所有 © 2026 探花传媒 ckluqzi.cn */

:root {
  --primary: #1a0a2e;
  --secondary: #2d1b5e;
  --accent: #c9a227;
  --accent2: #e63b6f;
  --text-light: #f0e8ff;
  --text-muted: #a89bc2;
  --card-bg: #1e1040;
  --card-border: rgba(201,162,39,0.25);
  --gradient-main: linear-gradient(135deg, #1a0a2e 0%, #2d1b5e 50%, #1a0a2e 100%);
  --gradient-accent: linear-gradient(90deg, #c9a227, #e63b6f);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--primary);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: #e8c050; }

img { max-width: 100%; height: auto; display: block; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(26, 10, 46, 0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
  padding: 0 20px;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-logo img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.main-nav a {
  color: var(--text-light);
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--accent);
  background: rgba(201,162,39,0.12);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-login {
  padding: 7px 18px;
  border: 1px solid var(--accent);
  border-radius: 20px;
  color: var(--accent);
  font-size: 0.85rem;
  transition: var(--transition);
}

.btn-login:hover {
  background: var(--accent);
  color: var(--primary);
}

.btn-join {
  padding: 7px 18px;
  background: var(--gradient-accent);
  border-radius: 20px;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

.btn-join:hover { opacity: 0.85; }

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: rgba(45, 27, 94, 0.6);
  border-bottom: 1px solid rgba(201,162,39,0.15);
  padding: 10px 20px;
}

.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-form {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(201,162,39,0.3);
  border-radius: 24px;
  padding: 6px 16px;
  width: 100%;
  max-width: 560px;
  gap: 8px;
}

.search-form input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-light);
  font-size: 0.9rem;
  flex: 1;
  min-width: 0;
}

.search-form input::placeholder { color: var(--text-muted); }

.search-form button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent);
  font-size: 1rem;
  padding: 2px 4px;
  transition: var(--transition);
}

.search-form button:hover { color: #e8c050; }

.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.search-tags span {
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 10px;
  border: 1px solid rgba(201,162,39,0.2);
  border-radius: 12px;
  transition: var(--transition);
}

.search-tags span:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* ===== 英雄区 ===== */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/banner-hero.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(26,10,46,0.9) 0%, rgba(26,10,46,0.3) 60%, transparent 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  background: rgba(201,162,39,0.15);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.78rem;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  color: #fff;
}

.hero-content h1 em {
  font-style: normal;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(240,232,255,0.85);
  max-width: 540px;
  margin-bottom: 28px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 12px 28px;
  background: var(--gradient-accent);
  border-radius: 28px;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(230,59,111,0.4); color: #fff; }

.btn-secondary {
  padding: 12px 28px;
  border: 1.5px solid rgba(201,162,39,0.6);
  border-radius: 28px;
  color: var(--accent);
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-secondary:hover { background: rgba(201,162,39,0.12); transform: translateY(-2px); }

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  flex-wrap: wrap;
}

.stat-item { text-align: center; }
.stat-num {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.78rem; color: var(--text-muted); margin-top: 2px; }

/* ===== 通用区块 ===== */
.section {
  padding: 64px 20px;
}

.section-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.section-title em {
  font-style: normal;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(201,162,39,0.5);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0d0620;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img { transform: scale(1.06); }

.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}

.video-card:hover .play-btn { opacity: 1; }

.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(201,162,39,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
  transform: scale(0.8);
  transition: transform 0.3s ease;
}

.video-card:hover .play-icon { transform: scale(1); }

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
}

.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--accent2);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.video-info {
  padding: 14px 16px;
}

.video-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.video-meta span { display: flex; align-items: center; gap: 3px; }

.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: #fff;
  font-weight: 600;
  flex-shrink: 0;
}

.author-name { font-size: 0.8rem; color: var(--text-muted); }

/* ===== 图片卡片 ===== */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.photo-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
  background: var(--card-bg);
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.photo-card:hover img { transform: scale(1.08); }

.photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,10,46,0.85) 0%, transparent 50%);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

.photo-card:hover .photo-overlay { opacity: 1; }

.photo-name { font-size: 0.9rem; font-weight: 600; color: #fff; }

/* ===== 功能模块卡片 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 0 24px rgba(201,162,39,0.15);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: rgba(201,162,39,0.1);
  border: 1px solid rgba(201,162,39,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin: 0 auto 16px;
}

.feature-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== 专家展示 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.expert-photo {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
}

.expert-info {
  padding: 18px;
}

.expert-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.expert-role {
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 10px;
}

.expert-desc {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tag {
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 12px;
  background: rgba(201,162,39,0.1);
  border: 1px solid rgba(201,162,39,0.25);
  color: var(--accent);
}

.expert-btns {
  display: flex;
  gap: 8px;
}

.btn-sm {
  flex: 1;
  text-align: center;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: var(--transition);
}

.btn-sm-primary {
  background: var(--gradient-accent);
  color: #fff;
}

.btn-sm-outline {
  border: 1px solid var(--card-border);
  color: var(--text-muted);
}

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

/* ===== 用户评价 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 22px;
}

.review-stars {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 14px;
  font-style: italic;
}

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

.reviewer-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}

.reviewer-name { font-size: 0.88rem; font-weight: 600; color: var(--text-light); }
.reviewer-info { font-size: 0.75rem; color: var(--text-muted); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-light);
  transition: var(--transition);
}

.faq-question:hover { color: var(--accent); }

.faq-icon {
  width: 24px;
  height: 24px;
  border: 1px solid var(--card-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: var(--transition);
}

.faq-item.open .faq-icon { transform: rotate(45deg); border-color: var(--accent); color: var(--accent); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-item.open .faq-answer { max-height: 300px; }

.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 14px;
}

/* ===== 合作品牌 ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

.partner-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.partner-item:hover { border-color: var(--accent); color: var(--accent); }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
}

.contact-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.contact-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }

.qr-wrap {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}

.qr-item { text-align: center; }

.qr-box {
  width: 100px;
  height: 100px;
  background: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 6px;
  overflow: hidden;
}

.qr-box img { width: 100%; height: 100%; object-fit: cover; }

.qr-label { font-size: 0.75rem; color: var(--text-muted); }

/* ===== 社交分享 ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.share-label { font-size: 0.85rem; color: var(--text-muted); }

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
  transition: var(--transition);
  border: 1px solid transparent;
}

.share-wechat { background: rgba(7,193,96,0.12); border-color: rgba(7,193,96,0.3); color: #07c160; }
.share-weibo { background: rgba(230,22,45,0.12); border-color: rgba(230,22,45,0.3); color: #e6162d; }
.share-douyin { background: rgba(0,0,0,0.3); border-color: rgba(255,255,255,0.15); color: #fff; }
.share-bilibili { background: rgba(0,160,220,0.12); border-color: rgba(0,160,220,0.3); color: #00a0dc; }

.share-btn:hover { transform: translateY(-2px); opacity: 0.85; }

/* ===== 底部 ===== */
.site-footer {
  background: #0d0620;
  border-top: 1px solid rgba(201,162,39,0.2);
  padding: 48px 20px 24px;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo-text { font-size: 1.6rem; margin-bottom: 12px; display: block; }

.footer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 14px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 0.83rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-links a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-copy a { color: var(--text-muted); }
.footer-copy a:hover { color: var(--accent); }

.footer-update {
  font-size: 0.78rem;
  color: rgba(168,155,194,0.6);
}

/* ===== 分隔线 ===== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201,162,39,0.3), transparent);
  margin: 0;
}

/* ===== 标签页 ===== */
.tab-nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 28px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
  padding: 10px 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: var(--transition);
}

.tab-btn.active, .tab-btn:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ===== 内页头部 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
  padding: 48px 20px;
  border-bottom: 1px solid var(--card-border);
}

.page-hero-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.page-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.page-hero p {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.8;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--primary); }
::-webkit-scrollbar-thumb { background: rgba(201,162,39,0.4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .header-inner { height: 58px; }
  .hero-section { min-height: 380px; }
  .hero-stats { gap: 20px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 24px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .search-tags { display: none; }
}

@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .section { padding: 40px 16px; }
  .video-grid { grid-template-columns: 1fr; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in { animation: fadeInUp 0.5s ease forwards; }

/* ===== 懒加载占位 ===== */
img[data-src] { background: var(--card-bg); min-height: 100px; }

/* ===== 视频模态框 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.modal-box {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  width: 90%;
  max-width: 800px;
  overflow: hidden;
}

.modal-header {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--card-border);
}

.modal-title { font-size: 0.95rem; font-weight: 600; color: var(--text-light); }

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover { color: var(--accent2); }

.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--accent);
}

/* ===== 移动端导航 ===== */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.4rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 58px;
  left: 0;
  right: 0;
  background: rgba(26,10,46,0.98);
  border-bottom: 1px solid var(--card-border);
  padding: 16px 20px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  color: var(--text-light);
  font-size: 0.95rem;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-nav a:hover { color: var(--accent); background: rgba(201,162,39,0.08); }

/* ===== 悬浮播放按钮 ===== */
.video-card .play-btn { cursor: pointer; }