/* =====================================================
   开云体育 | divepilot.com - 主样式文件
   原创设计，版权所有 © 2025 开云体育
   ===================================================== */

/* ===== CSS变量 ===== */
:root {
  --primary: #1a3a6b;
  --primary-dark: #0f2347;
  --primary-light: #2a5298;
  --accent: #e85d04;
  --accent-light: #ff8c38;
  --accent-dark: #c44d00;
  --gold: #f5a623;
  --white: #ffffff;
  --bg-light: #f4f7fc;
  --bg-dark: #0d1b2a;
  --bg-card: #ffffff;
  --text-main: #1a1a2e;
  --text-muted: #5a6a7e;
  --text-light: #8a9ab0;
  --border: #e0e8f0;
  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --card-shadow: 0 4px 24px rgba(26,58,107,0.10);
  --card-shadow-hover: 0 12px 40px rgba(26,58,107,0.18);
  --transition: 0.28s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1280px;
  --header-h: 68px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: var(--white);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ===== 容器 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ===== 顶部信息栏 ===== */
.topbar {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.82);
  font-size: 0.82rem;
  padding: 7px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.topbar a { color: rgba(255,255,255,0.72); transition: color var(--transition); }
.topbar a:hover { color: var(--accent-light); }
.topbar-right { display: flex; gap: 20px; }

/* ===== 主导航 ===== */
.site-header {
  background: var(--white);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 16px rgba(26,58,107,0.08);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.site-logo img { display: block; }

/* 主导航菜单 */
.main-nav { flex: 1; }
.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-item { position: relative; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--accent);
  background: rgba(232,93,4,0.08);
}
.nav-link .arrow { font-size: 0.7rem; opacity: 0.6; }

/* 下拉菜单 */
.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow-hover);
  min-width: 180px;
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 100;
}
.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown a {
  display: block;
  padding: 9px 14px;
  font-size: 0.88rem;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.dropdown a:hover { background: var(--bg-light); color: var(--accent); }

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border: 1.5px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
  flex-shrink: 0;
  transition: border-color var(--transition);
}
.header-search:focus-within { border-color: var(--primary); }
.header-search input {
  background: none;
  border: none;
  outline: none;
  padding: 7px 14px;
  font-size: 0.88rem;
  width: 200px;
  color: var(--text-main);
}
.header-search button {
  background: var(--primary);
  color: var(--white);
  border: none;
  padding: 7px 14px;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition);
}
.header-search button:hover { background: var(--accent); }

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  color: var(--primary);
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.mobile-menu-btn:hover { background: var(--bg-light); }

/* 导航下搜索栏 */
#search-nav {
  background: var(--primary);
  padding: 12px 0;
}
.search-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.search-nav-inner .search-form {
  flex: 1;
  min-width: 280px;
  display: flex;
  gap: 10px;
}
.search-nav-inner .search-input {
  flex: 1;
  background: rgba(255,255,255,0.15);
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: 24px;
  padding: 9px 18px;
  color: var(--white);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}
.search-nav-inner .search-input::placeholder { color: rgba(255,255,255,0.6); }
.search-nav-inner .search-input:focus { border-color: var(--accent-light); }
.search-nav-inner button {
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: 24px;
  padding: 9px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition);
}
.search-nav-inner button:hover { background: var(--accent-dark); }
.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
}
.hot-tag {
  background: rgba(255,255,255,0.15);
  color: var(--white);
  padding: 4px 12px;
  border-radius: 14px;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.8rem;
}
.hot-tag:hover { background: var(--accent); }

/* 移动端导航 */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}
.mobile-nav.open { opacity: 1; visibility: visible; }
.mobile-nav-list {
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--white);
  padding: 60px 24px 24px;
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
}
.mobile-nav.open .mobile-nav-list { transform: translateX(0); }
.mobile-nav-list li a {
  display: block;
  padding: 14px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}
.mobile-nav-list li a:hover { color: var(--accent); }
.mobile-nav-close {
  position: absolute;
  top: 16px;
  right: 24px;
  font-size: 1.4rem;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.mobile-nav-close:hover { background: var(--bg-light); }

/* ===== Hero 横幅 ===== */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transform: scale(1.04);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,27,42,0.88) 0%, rgba(26,58,107,0.72) 50%, rgba(232,93,4,0.28) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  color: var(--white);
  padding: 60px 0;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(232,93,4,0.9);
  color: var(--white);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-content h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.hero-content h1 em { color: var(--accent-light); font-style: normal; }
.hero-content p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.88);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--white);
  padding: 13px 28px;
  border-radius: 28px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(232,93,4,0.35);
}
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,93,4,0.4); color: var(--white); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  color: var(--white);
  padding: 13px 28px;
  border-radius: 28px;
  font-size: 0.95rem;
  font-weight: 700;
  border: 2px solid rgba(255,255,255,0.5);
  transition: all var(--transition);
  backdrop-filter: blur(8px);
}
.btn-outline:hover { background: rgba(255,255,255,0.25); border-color: var(--white); color: var(--white); }

/* ===== 统计栏 ===== */
.stats-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 28px 0;
}
.stats-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item { color: var(--white); }
.stat-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent-light);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.78); }

/* ===== Section 通用 ===== */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-light); }
.section-dark {
  background: var(--bg-dark);
  color: var(--white);
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,93,4,0.1);
  color: var(--accent);
  padding: 5px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 14px;
  line-height: 1.3;
}
.section-dark .section-title { color: var(--white); }
.section-title em { color: var(--accent); font-style: normal; }
.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}
.section-dark .section-desc { color: rgba(255,255,255,0.7); }
.section-footer { text-align: center; margin-top: 40px; }
.view-all {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: var(--white);
  padding: 12px 32px;
  border-radius: 28px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition);
}
.view-all:hover { background: var(--accent); color: var(--white); transform: translateY(-2px); }

/* ===== 分类标签 ===== */
.cat-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.cat-tab {
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--bg-light);
  color: var(--text-muted);
  border: 1.5px solid var(--border);
  transition: all var(--transition);
}
.cat-tab:hover, .cat-tab.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--primary-dark);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.06); }

/* 播放按钮 */
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.video-card:hover .play-btn { background: rgba(0,0,0,0.35); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(232,93,4,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--white);
  opacity: 0;
  transform: scale(0.7);
  transition: all var(--transition);
  padding-left: 4px;
  box-shadow: 0 4px 20px rgba(232,93,4,0.5);
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: var(--white);
  font-size: 0.78rem;
  padding: 3px 8px;
  border-radius: 5px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: var(--white);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}
.live-dot {
  width: 7px;
  height: 7px;
  background: #ff4444;
  border-radius: 50%;
  display: inline-block;
  animation: pulse 1.2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-light);
}
.video-stats { display: flex; gap: 12px; }

/* ===== 功能卡片 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--card-shadow);
  transition: all var(--transition);
  border: 1.5px solid transparent;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--accent);
}
.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
  line-height: 1;
}
.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
}
.feature-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* ===== AI卡片 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.ai-card {
  background: rgba(255,255,255,0.06);
  border: 1.5px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all var(--transition);
}
.ai-card:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--accent);
  transform: translateY(-4px);
}
.ai-icon { font-size: 2.2rem; margin-bottom: 14px; }
.ai-card h3 { font-size: 1.05rem; font-weight: 800; color: var(--white); margin-bottom: 10px; }
.ai-card p { font-size: 0.88rem; color: rgba(255,255,255,0.7); line-height: 1.7; }

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.expert-card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); }
.expert-photo {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--bg-light);
}
.expert-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
.expert-card:hover .expert-photo img { transform: scale(1.05); }
.expert-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--accent);
  color: var(--white);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}
.expert-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.expert-name { font-size: 1.15rem; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.expert-title { font-size: 0.85rem; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.expert-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; flex: 1; }
.expert-awards { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.award-tag {
  background: rgba(26,58,107,0.08);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
}
.expert-btns { display: flex; gap: 10px; }
.btn-sm {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  transition: all var(--transition);
}
.btn-sm-primary { background: var(--primary); color: var(--white); }
.btn-sm-primary:hover { background: var(--accent); color: var(--white); }
.btn-sm-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-sm-outline:hover { background: var(--primary); color: var(--white); }

/* ===== 合作伙伴 ===== */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.partner-logo {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
  cursor: default;
}
.partner-logo:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ===== 步骤 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.step-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--card-shadow);
  text-align: center;
  transition: all var(--transition);
  position: relative;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }
.step-num {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 900;
  margin: 0 auto 16px;
}
.step-card h3 { font-size: 1rem; font-weight: 800; color: var(--primary); margin-bottom: 10px; }
.step-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* ===== 评价卡片 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--card-shadow);
  transition: all var(--transition);
  border-left: 4px solid var(--accent);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }
.review-stars { font-size: 1rem; margin-bottom: 12px; color: var(--gold); }
.review-text { font-size: 0.9rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; font-style: italic; }
.reviewer { display: flex; align-items: center; gap: 12px; }
.reviewer-avatar {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  flex-shrink: 0;
}
.reviewer-name { font-size: 0.92rem; font-weight: 700; color: var(--text-main); }
.reviewer-info { font-size: 0.78rem; color: var(--text-light); }

/* ===== 联系 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info h3 { font-size: 1.3rem; font-weight: 800; color: var(--primary); margin-bottom: 24px; }
.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 18px;
}
.contact-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 2px; }
.contact-detail { display: flex; flex-direction: column; gap: 3px; }
.contact-detail strong { font-size: 0.9rem; font-weight: 700; color: var(--text-main); }
.contact-detail span { font-size: 0.88rem; color: var(--text-muted); }
.qr-row { display: flex; gap: 20px; margin-top: 20px; }
.qr-item { text-align: center; }
.qr-item img { width: 100px; height: 100px; object-fit: cover; border-radius: var(--radius-sm); border: 1.5px solid var(--border); }
.qr-item p { font-size: 0.78rem; color: var(--text-muted); margin-top: 6px; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: var(--primary); }
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  background: var(--white);
  transition: all var(--transition);
  gap: 12px;
}
.faq-q:hover, .faq-q.open { background: var(--bg-light); color: var(--primary); }
.faq-toggle {
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-q.open .faq-toggle { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  background: var(--white);
}
.faq-a.open { max-height: 500px; }
.faq-a > div { padding: 0 22px 18px; font-size: 0.9rem; color: var(--text-muted); line-height: 1.8; }

/* ===== 文章卡片 ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.article-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: all var(--transition);
}
.article-card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); }
.article-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-light);
}
.article-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
.article-card:hover .article-img img { transform: scale(1.06); }
.article-body { padding: 20px; }
.article-cat {
  display: inline-block;
  background: rgba(232,93,4,0.1);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  margin-bottom: 10px;
}
.article-title { font-size: 0.95rem; font-weight: 800; color: var(--text-main); margin-bottom: 8px; line-height: 1.5; }
.article-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.breadcrumb-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--primary); }
.breadcrumb-inner a:hover { color: var(--accent); }
.breadcrumb-sep { color: var(--text-light); }
.breadcrumb-current { color: var(--text-main); font-weight: 600; }

/* ===== 页面Hero ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  padding: 56px 0;
  text-align: center;
}
.page-hero h1 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 900; margin-bottom: 14px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.82); max-width: 600px; margin: 0 auto; }

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  background: rgba(26,58,107,0.08);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 12px;
}

/* ===== 社交分享 ===== */
.social-share { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.share-label { font-size: 0.88rem; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-light);
  color: var(--text-main);
  border: 1.5px solid var(--border);
}
.share-btn:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.82);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand p { font-size: 0.88rem; color: rgba(255,255,255,0.65); line-height: 1.8; margin-top: 12px; }
.footer-col h4 { font-size: 1rem; font-weight: 800; color: var(--white); margin-bottom: 18px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.88rem; color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent-light); }
.footer-bottom {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-bottom a:hover { color: var(--accent-light); }
.update-time { color: rgba(255,255,255,0.5); font-size: 0.82rem; }

/* ===== 滚动到顶部 ===== */
#scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(26,58,107,0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition);
  z-index: 500;
  cursor: pointer;
}
#scroll-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
#scroll-top:hover { background: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .main-nav { display: none; }
  .header-search { display: none; }
  .mobile-menu-btn { display: flex; margin-left: auto; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .hero { min-height: 420px; }
  .hero-content { padding: 40px 0; }
  .topbar-right { display: none; }
  .search-hot-tags { display: none; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .article-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { justify-content: center; }
  #scroll-top { bottom: 20px; right: 20px; }
  .section-title { font-size: 1.5rem; }
}