/* ========================================
   芒果视频 - 原创主题样式 bdmayh.cn
   品牌色彩体系：深夜蓝+电光青+金焰橙
   ======================================== */

:root {
  --brand-dark:    #080C18;
  --brand-navy:    #0D1526;
  --brand-blue:    #111E38;
  --brand-cyan:    #00C8F0;
  --brand-gold:    #F5C518;
  --brand-orange:  #FF6B1A;
  --brand-white:   #F0F4FF;
  --brand-gray:    #8A9BBE;
  --brand-muted:   #3A4A6B;
  --brand-card:    #131D33;
  --brand-border:  #1E2E50;
  --radius-sm:     6px;
  --radius-md:     12px;
  --radius-lg:     20px;
  --shadow-glow:   0 0 20px rgba(0,200,240,0.18);
  --shadow-card:   0 4px 24px rgba(0,0,0,0.45);
  --transition:    0.28s cubic-bezier(0.4,0,0.2,1);
  --font-main:     'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--brand-dark);
  color: var(--brand-white);
  font-family: var(--font-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--brand-cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--brand-gold); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- 隐藏干扰标签 ---- */
.kktu-noise { display: none !important; visibility: hidden !important; }

/* ======== 公告栏 ======== */
.notice-bar {
  background: linear-gradient(90deg, var(--brand-navy), var(--brand-blue));
  border-bottom: 1px solid var(--brand-border);
  padding: 8px 0;
  overflow: hidden;
}
.notice-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.notice-label {
  background: var(--brand-cyan);
  color: var(--brand-dark);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 3px;
  flex-shrink: 0;
}
.notice-scroll { flex: 1; overflow: hidden; }
.notice-text {
  font-size: 0.78rem;
  color: var(--brand-gray);
  white-space: nowrap;
  animation: marquee 28s linear infinite;
  display: inline-block;
}
@keyframes marquee {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* ======== HEADER ======== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(8,12,24,0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--brand-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.5); }
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}
.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- 主导航 ---- */
.main-nav { flex: 1; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand-gray);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-list a:hover,
.nav-list a.active {
  color: var(--brand-cyan);
  background: rgba(0,200,240,0.08);
}

/* ---- 搜索框 ---- */
.header-search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--brand-border);
  border-radius: 24px;
  padding: 6px 14px;
  min-width: 200px;
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--brand-white);
  font-size: 0.82rem;
  flex: 1;
  font-family: var(--font-main);
}
.header-search input::placeholder { color: var(--brand-gray); }
.search-btn {
  background: none;
  border: none;
  color: var(--brand-gray);
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  transition: color var(--transition);
}
.search-btn:hover { color: var(--brand-cyan); }

/* ---- 汉堡菜单 ---- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--brand-gray);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---- 移动菜单 ---- */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(8,12,24,0.97);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.mobile-menu.open { opacity: 1; pointer-events: all; }
.mobile-menu-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--brand-gray);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition);
}
.mobile-menu-close:hover { color: var(--brand-white); }
.mobile-nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.mobile-nav-list a {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--brand-gray);
  padding: 12px 32px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.mobile-nav-list a:hover { color: var(--brand-cyan); background: rgba(0,200,240,0.08); }

/* ======== 面包屑 ======== */
.breadcrumb {
  background: var(--brand-navy);
  border-bottom: 1px solid var(--brand-border);
  padding: 10px 0;
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--brand-gray);
}
.breadcrumb-inner a { color: var(--brand-gray); }
.breadcrumb-inner a:hover { color: var(--brand-cyan); }
.breadcrumb-inner .sep { color: var(--brand-muted); }
.breadcrumb-inner .current { color: var(--brand-white); }

/* ======== 搜索栏区域 ======== */
.search-bar-section {
  background: var(--brand-navy);
  padding: 24px 0;
  border-bottom: 1px solid var(--brand-border);
}
.search-bar-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}
.search-bar-main {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--brand-border);
  border-radius: 32px;
  overflow: hidden;
  margin-bottom: 14px;
}
.search-bar-main input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--brand-white);
  font-size: 0.95rem;
  padding: 14px 20px;
  font-family: var(--font-main);
}
.search-bar-main input::placeholder { color: var(--brand-gray); }
.search-bar-btn {
  background: var(--brand-cyan);
  color: var(--brand-dark);
  border: none;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 14px 24px;
  cursor: pointer;
  transition: background var(--transition);
  font-family: var(--font-main);
  white-space: nowrap;
}
.search-bar-btn:hover { background: var(--brand-gold); }
.search-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.search-tag {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--brand-border);
  color: var(--brand-gray);
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 14px;
  cursor: pointer;
  transition: all var(--transition);
}
.search-tag:hover { border-color: var(--brand-cyan); color: var(--brand-cyan); background: rgba(0,200,240,0.06); }
.search-hint {
  display: none;
  font-size: 0.82rem;
  color: var(--brand-gray);
  padding: 8px 0;
  text-align: center;
}

/* ======== HERO ======== */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8,12,24,0.95) 0%, rgba(8,12,24,0.75) 50%, rgba(8,12,24,0.55) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,200,240,0.1);
  border: 1px solid rgba(0,200,240,0.25);
  color: var(--brand-cyan);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.brand-hl {
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-title-sub { color: var(--brand-orange); }
.hero-desc {
  font-size: 1.05rem;
  color: var(--brand-gray);
  max-width: 640px;
  line-height: 1.8;
  margin-bottom: 36px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.stat-item { display: flex; flex-direction: column; gap: 2px; }
.stat-num {
  font-size: 1.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.78rem; color: var(--brand-gray); }

/* ======== 按钮 ======== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--brand-cyan), #0099C0);
  color: var(--brand-dark);
  font-size: 0.95rem;
  font-weight: 800;
  padding: 14px 28px;
  border-radius: 32px;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); color: var(--brand-dark); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--brand-white);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 13px 26px;
  border-radius: 32px;
  border: 1px solid rgba(255,255,255,0.2);
  transition: all var(--transition);
  cursor: pointer;
}
.btn-outline:hover { border-color: var(--brand-cyan); color: var(--brand-cyan); background: rgba(0,200,240,0.06); }
.btn-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,200,240,0.08);
  border: 1px solid var(--brand-border);
  color: var(--brand-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 24px;
  transition: all var(--transition);
}
.btn-more:hover { background: rgba(0,200,240,0.15); border-color: var(--brand-cyan); transform: translateY(-1px); }
.btn-ai {
  display: inline-flex;
  align-items: center;
  background: linear-gradient(135deg, var(--brand-cyan), #0099C0);
  color: var(--brand-dark);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: 20px;
  transition: all var(--transition);
  width: fit-content;
}
.btn-ai:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); color: var(--brand-dark); }
.btn-ai-outline {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--brand-cyan);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 20px;
  border: 1px solid rgba(0,200,240,0.3);
  transition: all var(--transition);
  width: fit-content;
}
.btn-ai-outline:hover { background: rgba(0,200,240,0.1); border-color: var(--brand-cyan); }

/* ======== 通用区块 ======== */
.section {
  padding: 72px 0;
}
.section-alt { background: var(--brand-navy); }
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  background: rgba(0,200,240,0.1);
  border: 1px solid rgba(0,200,240,0.2);
  color: var(--brand-cyan);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 14px;
  margin-bottom: 14px;
  letter-spacing: 0.06em;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  margin-bottom: 14px;
  line-height: 1.25;
}
.hl {
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 0.95rem;
  color: var(--brand-gray);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.8;
}
.section-more { text-align: center; margin-top: 40px; }

/* ======== TAB ======== */
.tab-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.tab-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--brand-border);
  color: var(--brand-gray);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-main);
}
.tab-btn.active,
.tab-btn:hover {
  background: rgba(0,200,240,0.1);
  border-color: var(--brand-cyan);
  color: var(--brand-cyan);
}
.tab-panel { display: none; }
.tab-panel[data-tab="all"] { display: block; }

/* ======== 视频卡片 ======== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  border-color: var(--brand-cyan);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--brand-navy);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8,12,24,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .play-overlay,
.media-card-large:hover .play-overlay,
.media-list-item:hover .play-overlay,
.cat-card:hover .play-overlay,
.ent-card:hover .play-overlay { opacity: 1; }
.play-btn {
  width: 52px;
  height: 52px;
  background: rgba(0,200,240,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 28px rgba(0,200,240,0.5);
  transition: transform var(--transition);
}
.play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--brand-dark);
  margin-left: 4px;
}
.video-card:hover .play-btn { transform: scale(1.1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(8,12,24,0.85);
  color: var(--brand-white);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--brand-orange);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 10px;
  font-size: 0.72rem;
  color: var(--brand-gray);
  flex-wrap: wrap;
}

/* ======== 汽车传媒模块 ======== */
.media-section { background: var(--brand-navy); }
.media-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.media-card-large {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.media-card-large:hover { border-color: var(--brand-cyan); box-shadow: var(--shadow-glow); }
.media-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.media-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.media-card-large:hover .media-thumb img { transform: scale(1.04); }
.media-info { padding: 20px; }
.media-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.media-desc { font-size: 0.84rem; color: var(--brand-gray); line-height: 1.7; margin-bottom: 12px; }
.media-meta { display: flex; gap: 12px; font-size: 0.78rem; color: var(--brand-gray); }
.media-list { display: flex; flex-direction: column; gap: 12px; }
.media-list-item {
  display: flex;
  gap: 12px;
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}
.media-list-item:hover { border-color: var(--brand-cyan); transform: translateX(4px); }
.media-list-thumb { position: relative; width: 140px; flex-shrink: 0; aspect-ratio: 16/9; overflow: hidden; }
.media-list-thumb img { width: 100%; height: 100%; object-fit: cover; }
.media-list-info { padding: 10px 12px 10px 0; flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 6px; }
.media-list-title {
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.media-list-meta { display: flex; align-items: center; gap: 8px; font-size: 0.72rem; color: var(--brand-gray); }
.video-tag-sm { background: var(--brand-orange); color: #fff; font-size: 0.68rem; padding: 1px 6px; border-radius: 3px; }

/* ======== 娱乐专区 ======== */
.ent-section { background: var(--brand-dark); }
.ent-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 20px; }
.ent-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
}
.ent-card:hover { border-color: var(--brand-cyan); box-shadow: var(--shadow-glow); transform: translateY(-3px); }
.ent-card-highlight { border-color: rgba(0,200,240,0.3); background: linear-gradient(135deg, var(--brand-card), rgba(0,200,240,0.05)); }
.ent-icon { font-size: 2rem; }
.ent-title { font-size: 1rem; font-weight: 700; color: var(--brand-white); }
.ent-desc { font-size: 0.82rem; color: var(--brand-gray); line-height: 1.7; flex: 1; }
.ent-thumb { position: relative; border-radius: var(--radius-sm); overflow: hidden; aspect-ratio: 16/9; }
.ent-thumb img { width: 100%; height: 100%; object-fit: cover; }
.ent-link { font-size: 0.82rem; color: var(--brand-cyan); font-weight: 600; transition: color var(--transition); }
.ent-link:hover { color: var(--brand-gold); }

/* ======== AI赋能 ======== */
.ai-section { background: linear-gradient(135deg, var(--brand-navy) 0%, rgba(0,200,240,0.04) 50%, var(--brand-navy) 100%); }
.ai-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 20px; }
.ai-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ai-card:hover { border-color: var(--brand-cyan); box-shadow: var(--shadow-glow); transform: translateY(-3px); }
.ai-card-primary { border-color: rgba(0,200,240,0.3); background: linear-gradient(135deg, rgba(0,200,240,0.08), var(--brand-card)); }
.ai-icon-wrap { width: 48px; height: 48px; background: rgba(0,200,240,0.1); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; }
.ai-icon { font-size: 1.6rem; }
.ai-title { font-size: 1rem; font-weight: 700; }
.ai-desc { font-size: 0.82rem; color: var(--brand-gray); line-height: 1.7; flex: 1; }
.ai-features { display: flex; flex-direction: column; gap: 6px; }
.ai-features li { font-size: 0.82rem; color: var(--brand-gray); }

/* ======== 社区功能 ======== */
.community-section { background: var(--brand-dark); }
.community-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.cat-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.cat-card:hover { border-color: var(--brand-cyan); box-shadow: var(--shadow-glow); transform: translateY(-3px); }
.cat-img-wrap { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.cat-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.cat-card:hover .cat-img-wrap img { transform: scale(1.04); }
.cat-badge { position: absolute; top: 10px; left: 10px; background: var(--brand-cyan); color: var(--brand-dark); font-size: 0.7rem; font-weight: 700; padding: 3px 10px; border-radius: 4px; }
.cat-info { padding: 18px; }
.cat-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.cat-desc { font-size: 0.82rem; color: var(--brand-gray); line-height: 1.7; margin-bottom: 10px; }
.cat-stats { display: flex; gap: 16px; font-size: 0.75rem; color: var(--brand-gray); margin-bottom: 12px; }
.cat-link { font-size: 0.82rem; color: var(--brand-cyan); font-weight: 600; }
.cat-link:hover { color: var(--brand-gold); }

/* ======== 专家展示（EEAT核心） ======== */
.expert-section { background: var(--brand-navy); }
.expert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.expert-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover { border-color: var(--brand-gold); box-shadow: 0 0 24px rgba(245,197,24,0.12); transform: translateY(-3px); }
.expert-avatar { width: 80px; height: 80px; border-radius: 50%; overflow: hidden; margin: 0 auto 14px; border: 3px solid var(--brand-cyan); box-shadow: var(--shadow-glow); }
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-name { font-size: 1.1rem; font-weight: 800; margin-bottom: 4px; }
.expert-role { display: inline-block; font-size: 0.75rem; color: var(--brand-cyan); background: rgba(0,200,240,0.1); padding: 2px 10px; border-radius: 20px; margin-bottom: 10px; }
.expert-desc { font-size: 0.8rem; color: var(--brand-gray); line-height: 1.7; margin-bottom: 10px; }
.expert-footer { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; }
.expert-tag { display: inline-block; font-size: 0.7rem; background: rgba(255,107,26,0.1); color: var(--brand-orange); padding: 2px 8px; border-radius: 3px; }
.expert-since { font-size: 0.7rem; color: var(--brand-muted); }

/* EEAT可信度声明 */
.eeat-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 40px;
  padding: 24px;
  background: rgba(0,200,240,0.04);
  border: 1px solid rgba(0,200,240,0.12);
  border-radius: var(--radius-md);
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--brand-gray);
}
.trust-icon { font-size: 1.1rem; }

/* ======== FAQ（统一使用 .faq-q / .faq-a 类名） ======== */
.faq-section { background: var(--brand-dark); }
.faq-grid { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: rgba(0,200,240,0.3); }
.faq-q {
  padding: 18px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color var(--transition);
  user-select: none;
}
.faq-q:hover { color: var(--brand-cyan); }
.faq-arrow { font-size: 18px; color: var(--brand-gray); transition: transform var(--transition); flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--brand-cyan); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding var(--transition);
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 18px; }
.faq-a p { font-size: 0.88rem; color: var(--brand-gray); line-height: 1.8; }

/* ======== 合作品牌 ======== */
.partners-section { background: var(--brand-navy); }
.partners-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.partner-item {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  color: var(--brand-gray);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.partner-item:hover { border-color: var(--brand-cyan); color: var(--brand-cyan); background: rgba(0,200,240,0.05); }

/* ======== 页脚 ======== */
.site-footer {
  background: var(--brand-navy);
  border-top: 1px solid var(--brand-border);
  padding-top: 56px;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--brand-border);
}
.footer-brand .site-logo { margin-bottom: 14px; }
.footer-logo img { width: 48px; height: 48px; }
.footer-desc { font-size: 0.82rem; color: var(--brand-gray); line-height: 1.8; margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--brand-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition);
  color: var(--brand-gray);
}
.social-btn:hover { background: rgba(0,200,240,0.1); border-color: var(--brand-cyan); color: var(--brand-cyan); }
.footer-col-title { font-size: 0.88rem; font-weight: 700; color: var(--brand-white); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--brand-border); }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.82rem; color: var(--brand-gray); transition: color var(--transition); }
.footer-links a:hover { color: var(--brand-cyan); }
.footer-bottom { padding: 20px 0; text-align: center; display: flex; flex-direction: column; gap: 6px; }
.footer-copy { font-size: 0.8rem; color: var(--brand-gray); }
.footer-update { font-size: 0.75rem; color: var(--brand-muted); }
.footer-icp { font-size: 0.75rem; color: var(--brand-muted); }

/* ======== 回到顶部 ======== */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 44px;
  height: 44px;
  background: var(--brand-cyan);
  color: var(--brand-dark);
  border-radius: 50%;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.back-to-top.visible { opacity: 1; pointer-events: all; }
.back-to-top:hover { transform: translateY(-3px); background: var(--brand-gold); }

/* ======== 内页 Hero ======== */
.page-hero {
  background: linear-gradient(135deg, var(--brand-navy), var(--brand-blue));
  border-bottom: 1px solid var(--brand-border);
  padding: 48px 0;
}
.page-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 14px;
  line-height: 1.2;
}
.page-desc {
  font-size: 0.95rem;
  color: var(--brand-gray);
  max-width: 720px;
  line-height: 1.8;
}

/* ======== 社区页面 ======== */
.community-stats {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.stat-box {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 120px;
  text-align: center;
}
.stat-box .stat-num {
  font-size: 1.4rem;
  font-weight: 900;
}
.stat-box .stat-label { font-size: 0.78rem; color: var(--brand-gray); }

/* ======== 社区帖子 ======== */
.community-post {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
  transition: border-color var(--transition);
}
.community-post:hover { border-color: rgba(0,200,240,0.3); }
.post-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.post-avatar {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-gold));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 800;
  color: var(--brand-dark);
  flex-shrink: 0;
}
.post-author { font-size: 0.88rem; font-weight: 700; color: var(--brand-white); }
.post-time { font-size: 0.75rem; color: var(--brand-muted); }
.post-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.post-excerpt { font-size: 0.84rem; color: var(--brand-gray); line-height: 1.7; margin-bottom: 12px; }
.post-footer { display: flex; gap: 16px; font-size: 0.78rem; color: var(--brand-muted); }

/* ======== 视频模态框 ======== */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-overlay { position: absolute; inset: 0; background: rgba(8,12,24,0.92); cursor: pointer; }
.video-modal-inner {
  position: relative;
  z-index: 1;
  width: 90%;
  max-width: 900px;
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,0.8);
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  color: #fff;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}
.video-modal-close:hover { background: var(--brand-orange); }
.video-modal-player video { width: 100%; display: block; aspect-ratio: 16/9; background: #000; }
.video-modal-title { padding: 14px 16px; font-size: 0.88rem; font-weight: 600; color: var(--brand-white); background: var(--brand-navy); }

/* ======== 响应式 ======== */
@media (max-width: 1200px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .ent-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr 1fr; }
  .media-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1024px) {
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .main-nav { display: none; }
  .header-search { display: none; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .ent-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .media-list-thumb { width: 100px; }
  .hero { min-height: 70vh; }
  .hero-stats { gap: 20px; }
  .eeat-trust { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .community-stats { gap: 12px; }
  .stat-box { min-width: 80px; }
}