/*
 * 今日大赛 - 官方网站主样式
 * 设计风格：深红暗金影院风
 * 主色：#e91e8c（今日大赛粉）| 辅助色：#d4a017（暗金）| 背景：#0d0d14（深夜黑）
 * 文字：#f0e6ff（淡紫白）
 */

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --pink: #e91e8c;
  --pink-light: #ff6b9d;
  --gold: #d4a017;
  --gold-light: #f0c040;
  --bg: #0d0d14;
  --bg2: #13131f;
  --bg3: #1a1a2e;
  --card-bg: rgba(255,255,255,0.04);
  --border: rgba(233,30,140,0.25);
  --text: #f0e6ff;
  --text-muted: #a89bc0;
  --radius: 10px;
  --ease: cubic-bezier(0.23,1,0.32,1);
}

html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--pink); border-radius: 3px; }

/* ===== 顶部公告栏 ===== */
.notice-bar {
  background: linear-gradient(90deg, var(--pink), var(--gold), var(--pink));
  background-size: 200% 100%;
  animation: noticeSlide 4s linear infinite;
  color: #fff;
  font-size: 13px;
  text-align: center;
  padding: 6px 0;
  font-weight: 600;
  letter-spacing: 1px;
}
@keyframes noticeSlide { 0%{background-position:0% 50%} 100%{background-position:200% 50%} }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,13,20,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s var(--ease);
}
.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo img.logo-img {
  height: 44px;
  width: auto;
  object-fit: contain;
}
.nav-logo .logo-text {
  font-size: 20px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--pink), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-menu a {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--pink);
  background: rgba(233,30,140,0.1);
}
/* 搜索框 */
.nav-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0 14px;
  height: 36px;
  gap: 8px;
  transition: border-color 0.2s;
  min-width: 200px;
}
.nav-search:focus-within { border-color: var(--pink); }
.nav-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 13px;
  width: 100%;
}
.nav-search input::placeholder { color: var(--text-muted); }
.nav-search button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
  padding: 0;
  transition: color 0.2s;
}
.nav-search button:hover { color: var(--pink); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn-login {
  padding: 7px 18px;
  border-radius: 20px;
  border: 1px solid var(--pink);
  color: var(--pink);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  background: none;
  transition: all 0.2s var(--ease);
}
.btn-login:hover { background: var(--pink); color: #fff; }
.btn-join {
  padding: 7px 18px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--pink), var(--pink-light));
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s var(--ease);
  box-shadow: 0 4px 15px rgba(233,30,140,0.4);
}
.btn-join:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(233,30,140,0.5); }
/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: all 0.3s; }

/* ===== 搜索栏（导航下方） ===== */
.search-bar-section {
  background: var(--bg2);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding: 14px 0;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-bar-wrap {
  flex: 1;
  max-width: 640px;
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.07);
  border: 1.5px solid var(--border);
  border-radius: 28px;
  padding: 0 18px;
  height: 44px;
  gap: 10px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-bar-wrap:focus-within {
  border-color: var(--pink);
  box-shadow: 0 0 0 3px rgba(233,30,140,0.15);
}
.search-bar-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 14px;
}
.search-bar-wrap input::placeholder { color: var(--text-muted); }
.search-bar-wrap .search-icon { color: var(--text-muted); font-size: 16px; }
.search-bar-wrap button {
  background: linear-gradient(135deg, var(--pink), var(--pink-light));
  border: none;
  border-radius: 20px;
  color: #fff;
  padding: 5px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
.search-bar-wrap button:hover { opacity: 0.85; }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
  font-size: 12px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  padding: 3px 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.search-tag:hover { color: var(--pink); border-color: var(--pink); }

/* ===== 通用容器 ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ===== 区块标题 ===== */
.section-header { text-align: center; margin-bottom: 40px; }
.section-title {
  font-size: 30px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--pink), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.section-subtitle { color: var(--text-muted); font-size: 14px; }
.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.section-header-row .section-title { margin-bottom: 0; text-align: left; }
.view-more {
  font-size: 13px;
  color: var(--pink);
  border: 1px solid var(--pink);
  border-radius: 16px;
  padding: 4px 14px;
  transition: all 0.2s;
}
.view-more:hover { background: var(--pink); color: #fff; }

/* ===== Hero 区 ===== */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center top;
  filter: brightness(0.45);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,20,0.9) 40%, rgba(233,30,140,0.15) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-text h1 {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}
.hero-text h1 .brand {
  background: linear-gradient(135deg, var(--pink), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-text .hero-desc {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--pink), var(--pink-light));
  color: #fff;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  box-shadow: 0 6px 24px rgba(233,30,140,0.45);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(233,30,140,0.55); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-radius: 28px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid rgba(255,255,255,0.15);
  cursor: pointer;
  transition: all 0.25s var(--ease);
}
.btn-secondary:hover { background: rgba(255,255,255,0.14); transform: translateY(-2px); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 28px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--pink), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.hero-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.hero-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
}
.hero-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}
.hero-card:hover img { transform: scale(1.06); }
.hero-card .card-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 30px 12px 12px;
  background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
  font-size: 13px;
  font-weight: 600;
  color: #fff;
}
.hero-card .live-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--pink);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.6} }
.hero-card:first-child { grid-row: span 2; aspect-ratio: auto; }

/* ===== 视频卡片通用 ===== */
.video-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s;
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(233,30,140,0.25);
  border-color: var(--pink);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg3);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity 0.25s var(--ease);
}
.video-card:hover .play-overlay { opacity: 1; }
.play-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(233,30,140,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
  box-shadow: 0 0 0 0 rgba(233,30,140,0.5);
}
.video-card:hover .play-btn {
  transform: scale(1);
  box-shadow: 0 0 0 8px rgba(233,30,140,0.2);
}
.play-btn svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--pink);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.video-badge.gold { background: var(--gold); color: #000; }
.video-badge.blue { background: #1e90ff; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-info { padding: 12px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}
.video-meta .author { display: flex; align-items: center; gap: 5px; }
.video-meta .author img { width: 20px; height: 20px; border-radius: 50%; object-fit: cover; }
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ===== 视频网格 ===== */
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.video-grid-5 { grid-template-columns: repeat(5, 1fr); }

/* ===== 区块 ===== */
.section { padding: 60px 0; }
.section-alt { background: var(--bg2); }
.section-dark { background: var(--bg3); }

/* ===== 专家卡片 ===== */
.expert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
}
.expert-card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(212,160,23,0.2); border-color: var(--gold); }
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 3px solid var(--gold);
}
.expert-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.expert-title { font-size: 12px; color: var(--pink); margin-bottom: 8px; }
.expert-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; line-height: 1.6; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.award-tag {
  font-size: 11px;
  background: rgba(212,160,23,0.15);
  color: var(--gold);
  border: 1px solid rgba(212,160,23,0.3);
  border-radius: 12px;
  padding: 2px 10px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  font-size: 12px;
  padding: 5px 14px;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid var(--border);
  background: none;
  color: var(--text-muted);
}
.btn-sm:hover { border-color: var(--pink); color: var(--pink); }
.btn-sm.primary { background: var(--pink); color: #fff; border-color: var(--pink); }
.btn-sm.primary:hover { opacity: 0.85; }

/* ===== 合作品牌 ===== */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; align-items: center; }
.partner-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.2s;
}
.partner-item:hover { border-color: var(--gold); color: var(--gold); background: rgba(212,160,23,0.05); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: color 0.2s;
  user-select: none;
}
.faq-question:hover { color: var(--pink); }
.faq-question .faq-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  transition: all 0.3s;
}
.faq-item.open .faq-question .faq-icon { background: var(--pink); border-color: var(--pink); color: #fff; transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 20px 18px; }

/* ===== 用户评论 ===== */
.review-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
}
.review-card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(233,30,140,0.15); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; border: 2px solid var(--pink); }
.review-user-info .name { font-size: 14px; font-weight: 600; }
.review-user-info .date { font-size: 11px; color: var(--text-muted); }
.review-stars { color: var(--gold); font-size: 13px; margin-bottom: 8px; }
.review-text { font-size: 13px; color: var(--text-muted); line-height: 1.7; }

/* ===== 联系区 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-info h3 { font-size: 22px; font-weight: 800; margin-bottom: 20px; color: var(--gold); }
.contact-item { display: flex; gap: 14px; margin-bottom: 18px; align-items: flex-start; }
.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(233,30,140,0.12);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-detail .label { font-size: 12px; color: var(--text-muted); margin-bottom: 2px; }
.contact-detail .value { font-size: 14px; font-weight: 600; }
.qr-row { display: flex; gap: 24px; margin-top: 24px; }
.qr-item { text-align: center; }
.qr-item img { width: 110px; height: 110px; border-radius: 8px; border: 2px solid var(--border); margin-bottom: 8px; }
.qr-item .qr-label { font-size: 12px; color: var(--text-muted); }
.contact-map {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg3);
  border: 1px solid var(--border);
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--text-muted);
  font-size: 14px;
}
.contact-map .map-icon { font-size: 40px; }

/* ===== 社区入口 ===== */
.community-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.community-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all 0.25s var(--ease);
  cursor: pointer;
}
.community-card:hover { transform: translateY(-6px); border-color: var(--pink); box-shadow: 0 16px 40px rgba(233,30,140,0.2); }
.community-icon { font-size: 36px; margin-bottom: 14px; }
.community-name { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.community-desc { font-size: 13px; color: var(--text-muted); }

/* ===== 分享按钮 ===== */
.share-section { padding: 40px 0; background: var(--bg2); border-top: 1px solid var(--border); }
.share-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.share-label { font-size: 14px; font-weight: 600; color: var(--text-muted); }
.share-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s var(--ease);
}
.share-btn.wechat { background: #07c160; color: #fff; }
.share-btn.weibo { background: #e6162d; color: #fff; }
.share-btn.douyin { background: #000; color: #fff; border: 1px solid #333; }
.share-btn.bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }

/* ===== 页脚 ===== */
footer {
  background: #080810;
  border-top: 1px solid var(--border);
  padding: 50px 0 24px;
}
.footer-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo-text {
  font-size: 22px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--pink), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.footer-brand p { font-size: 13px; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; }
.footer-brand img.footer-logo { height: 50px; width: auto; margin-bottom: 12px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 14px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: var(--text-muted); transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--pink); }
.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;
  font-size: 12px;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); transition: color 0.2s; }
.footer-bottom a:hover { color: var(--pink); }
.footer-icp { display: flex; gap: 16px; flex-wrap: wrap; }

/* ===== AI 赋能区 ===== */
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ai-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.25s var(--ease);
  position: relative;
  overflow: hidden;
}
.ai-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--pink), var(--gold));
  opacity: 0;
  transition: opacity 0.25s;
}
.ai-card:hover::before { opacity: 1; }
.ai-card:hover { transform: translateY(-5px); box-shadow: 0 14px 36px rgba(233,30,140,0.18); }
.ai-icon { font-size: 32px; margin-bottom: 14px; }
.ai-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.ai-desc { font-size: 13px; color: var(--text-muted); line-height: 1.7; }

/* ===== How-To 加入 ===== */
.howto-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  position: relative;
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pink), var(--pink-light));
  color: #fff;
  font-size: 16px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}
.step-title { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-muted); }

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 14px 0;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: var(--text-muted); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--pink); }
.breadcrumb .sep { color: rgba(255,255,255,0.2); }

/* ===== 标签云 ===== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 14px;
  background: rgba(233,30,140,0.1);
  border: 1px solid rgba(233,30,140,0.25);
  color: var(--pink);
  cursor: pointer;
  transition: all 0.2s;
}
.tag:hover { background: var(--pink); color: #fff; }

/* ===== 页面内页横幅 ===== */
.page-banner {
  background: linear-gradient(135deg, var(--bg3), var(--bg2));
  border-bottom: 1px solid var(--border);
  padding: 50px 0;
  text-align: center;
}
.page-banner h1 { font-size: 36px; font-weight: 900; margin-bottom: 8px; }
.page-banner h1 span {
  background: linear-gradient(135deg, var(--pink), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-banner p { font-size: 15px; color: var(--text-muted); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-text h1 { font-size: 40px; }
  .hero-cards { max-width: 480px; }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-menu.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(13,13,20,0.98); padding: 16px; border-bottom: 1px solid var(--border); z-index: 999; }
  .hamburger { display: flex; }
  .nav-search { display: none; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .community-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 32px; }
  .hero-stats { gap: 20px; }
  .hero-stat .num { font-size: 22px; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .hero-cards { grid-template-columns: 1fr; }
  .hero-card:first-child { grid-row: auto; }
  .section-title { font-size: 24px; }
}

/* ===== 动画入场 ===== */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 视频播放模态 ===== */
.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;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  max-width: 720px;
  width: 90%;
  transform: scale(0.95);
  transition: transform 0.3s var(--ease);
}
.modal-overlay.open .modal-box { transform: scale(1); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-title { font-size: 16px; font-weight: 700; }
.modal-close { background: none; border: none; color: var(--text-muted); font-size: 22px; cursor: pointer; transition: color 0.2s; }
.modal-close:hover { color: var(--pink); }
.modal-video { width: 100%; aspect-ratio: 16/9; background: #000; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); font-size: 14px; }