/* 干扰标签隐藏 */
body > div[id] > dir,
body > div[id] > li,
body > div[id] > pre,
body > div[id] > acronym,
body > div[id] > p,
body > div[id] > b,
body > div[id] > em,
body > div[id] > dfn,
body > div[id] > tt,
body > div[id] > dd,
body > div[id] > button,
body > div[id] > small,
body > div[id] > span,
body > div[id] > center,
body > div[id] > option,
body > div[id] > td,
body > div[id] > tr,
body > div[class] > dir,
body > div[class] > li,
body > div[class] > pre,
body > div[class] > acronym,
body > div[class] > p,
body > div[class] > b,
body > div[class] > em,
body > div[class] > dfn,
body > div[class] > tt,
body > div[class] > dd,
body > div[class] > button,
body > div[class] > small,
body > div[class] > span,
body > div[class] > center,
body > div[class] > option,
body > div[class] > td,
body > div[class] > tr {
  display: none !important;
  visibility: hidden !important;
  height: 0 !important;
  width: 0 !important;
  overflow: hidden !important;
  position: absolute !important;
  left: -9999px !important;
}

/* =============================================
   91 修车改装视频社区 - 主样式文件
   品牌配色：工业橙 #E8500A / 钢铁灰 #1C2333 / 碳黑 #0D1117
   原创布局：斜切分割 + 金属质感 + 工业风排版
   ============================================= */

/* ---------- CSS变量 ---------- */
:root {
  --brand-orange: #E8500A;
  --brand-orange-light: #FF6B2B;
  --brand-orange-dark: #C43D00;
  --steel-dark: #1C2333;
  --steel-mid: #2A3347;
  --steel-light: #3D4F6B;
  --carbon-black: #0D1117;
  --carbon-mid: #161B27;
  --text-primary: #F0F2F5;
  --text-secondary: #9BA8BF;
  --text-muted: #5C6B85;
  --border-color: rgba(232,80,10,0.25);
  --card-bg: rgba(26,35,51,0.95);
  --shadow-orange: 0 4px 24px rgba(232,80,10,0.3);
  --shadow-dark: 0 8px 32px rgba(0,0,0,0.5);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --font-mono: 'SF Mono','Fira Code',Consolas,monospace;
}

/* ---------- 全局重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--carbon-black);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--brand-orange); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--brand-orange-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--carbon-black); }
::-webkit-scrollbar-thumb { background: var(--brand-orange); border-radius: 3px; }

/* ---------- 选中文字 ---------- */
::selection { background: var(--brand-orange); color: #fff; }

/* ---------- 顶部通知栏 ---------- */
.top-bar {
  background: linear-gradient(90deg, var(--brand-orange-dark), var(--brand-orange), var(--brand-orange-dark));
  background-size: 200% 100%;
  animation: gradientShift 4s ease infinite;
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  position: relative;
  z-index: 100;
}
@keyframes gradientShift {
  0%,100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.top-bar a { color: #fff; font-weight: 700; text-decoration: underline; }

/* ---------- 头部导航 ---------- */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(13,17,23,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.site-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 50%;
  border: 2px solid var(--brand-orange);
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-name {
  font-size: 22px;
  font-weight: 900;
  color: var(--brand-orange);
  letter-spacing: -0.5px;
}
.logo-tagline {
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* 导航菜单 */
nav.main-nav { flex: 1; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  justify-content: center;
}
.nav-list li a {
  display: block;
  padding: 8px 14px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
  white-space: nowrap;
}
.nav-list li a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--brand-orange);
  transition: width 0.3s ease;
  border-radius: 1px;
}
.nav-list li a:hover,
.nav-list li a.active {
  color: var(--text-primary);
  background: rgba(232,80,10,0.1);
}
.nav-list li a:hover::after,
.nav-list li a.active::after { width: 60%; }

/* 头部右侧操作 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn-join {
  background: var(--brand-orange);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  transition: var(--transition);
  box-shadow: 0 2px 12px rgba(232,80,10,0.4);
}
.btn-join:hover {
  background: var(--brand-orange-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-orange);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

/* ---------- 搜索栏 ---------- */
.search-bar-wrap {
  background: var(--carbon-mid);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding: 10px 0;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-form {
  display: flex;
  flex: 1;
  max-width: 640px;
  margin: 0 auto;
  background: var(--steel-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--brand-orange);
  box-shadow: 0 0 0 3px rgba(232,80,10,0.15);
}
.search-form input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 16px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
}
.search-form input::placeholder { color: var(--text-muted); }
.search-form button {
  background: var(--brand-orange);
  color: #fff;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.search-form button:hover { background: var(--brand-orange-light); }
.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-muted);
}
.search-tags span { color: var(--text-secondary); }
.search-tags a {
  color: var(--text-muted);
  padding: 2px 8px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  transition: var(--transition);
}
.search-tags a:hover { border-color: var(--brand-orange); color: var(--brand-orange); }

/* ---------- 面包屑 ---------- */
.breadcrumb-wrap {
  background: var(--carbon-mid);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  padding: 10px 0;
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb-list li { display: flex; align-items: center; gap: 8px; }
.breadcrumb-list li::after { content: '›'; color: var(--text-muted); }
.breadcrumb-list li:last-child::after { display: none; }
.breadcrumb-list a { color: var(--text-secondary); }
.breadcrumb-list a:hover { color: var(--brand-orange); }
.breadcrumb-list .current { color: var(--brand-orange); }

/* ---------- Hero Banner ---------- */
.hero-banner {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--carbon-black);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center 30%;
  filter: brightness(0.35) saturate(0.8);
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero-banner:hover .hero-bg { transform: scale(1.0); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,17,23,0.9) 0%, rgba(13,17,23,0.4) 50%, rgba(232,80,10,0.15) 100%);
}
/* 斜切装饰线 */
.hero-banner::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--carbon-black);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px 120px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(232,80,10,0.15);
  border: 1px solid rgba(232,80,10,0.4);
  color: var(--brand-orange-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--brand-orange);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title .brand { color: var(--brand-orange); }
.hero-title .sub { display: block; font-size: 0.55em; color: var(--text-secondary); font-weight: 400; letter-spacing: 0; margin-top: 8px; }
.hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-orange);
  color: #fff;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  transition: var(--transition);
  box-shadow: var(--shadow-orange);
}
.btn-primary:hover {
  background: var(--brand-orange-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(232,80,10,0.5);
  color: #fff;
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid rgba(255,255,255,0.2);
  transition: var(--transition);
}
.btn-secondary:hover {
  border-color: var(--brand-orange);
  color: var(--brand-orange);
  background: rgba(232,80,10,0.08);
}
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.stat-item { text-align: left; }
.stat-num {
  font-size: 28px;
  font-weight: 900;
  color: var(--brand-orange);
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label { font-size: 12px; color: var(--text-muted); letter-spacing: 0.5px; }

/* ---------- 通用Section ---------- */
.section {
  padding: 80px 0;
}
.section-alt { background: var(--carbon-mid); }
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-label {
  display: inline-block;
  color: var(--brand-orange);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
  position: relative;
  padding: 0 20px;
}
.section-label::before,
.section-label::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 30px;
  height: 1px;
  background: var(--brand-orange);
  opacity: 0.5;
}
.section-label::before { right: 100%; margin-right: -20px; }
.section-label::after { left: 100%; margin-left: -20px; }
.section-title {
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-title .highlight { color: var(--brand-orange); }
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ---------- 视频卡片 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-grid-large {
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
}
.video-card {
  background: var(--card-bg);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--brand-orange);
  box-shadow: var(--shadow-orange);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--steel-dark);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.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: 60px;
  height: 60px;
  background: var(--brand-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(232,80,10,0.6);
  transform: scale(0.8);
  transition: transform 0.3s ease;
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 24px; height: 24px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 3px;
  font-family: var(--font-mono);
}
.video-quality {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--brand-orange);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  letter-spacing: 0.5px;
}
.video-info {
  padding: 16px;
}
.video-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  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;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.video-author { display: flex; align-items: center; gap: 6px; }
.video-author-avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--brand-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: #fff;
  font-weight: 700;
}
.video-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.video-tag {
  background: rgba(232,80,10,0.1);
  color: var(--brand-orange);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid rgba(232,80,10,0.2);
}

/* ---------- 视频模态框 ---------- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.92);
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.video-modal.active { display: flex; }
.modal-inner {
  background: var(--steel-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 860px;
  width: 100%;
  box-shadow: 0 24px 80px rgba(0,0,0,0.8);
  animation: modalIn 0.3s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-video-wrap {
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.modal-video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--text-secondary);
}
.modal-video-placeholder .big-play {
  width: 80px;
  height: 80px;
  background: var(--brand-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-video-placeholder .big-play svg { width: 36px; height: 36px; fill: #fff; margin-left: 4px; }
.modal-info { padding: 20px 24px; }
.modal-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.modal-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: rgba(0,0,0,0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
}
.modal-close:hover { background: var(--brand-orange); }

/* ---------- 功能模块卡片 ---------- */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.module-card {
  background: var(--card-bg);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-orange), var(--brand-orange-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.module-card:hover::before { transform: scaleX(1); }
.module-card:hover {
  border-color: rgba(232,80,10,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-dark);
}
.module-icon {
  width: 52px;
  height: 52px;
  background: rgba(232,80,10,0.12);
  border: 1px solid rgba(232,80,10,0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 18px;
}
.module-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.module-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.module-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-orange);
}
.module-link:hover { gap: 10px; }

/* ---------- 专家卡片 ---------- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--card-bg);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.expert-card:hover {
  border-color: var(--brand-orange);
  transform: translateY(-4px);
  box-shadow: var(--shadow-orange);
}
.expert-photo {
  position: relative;
  height: 220px;
  overflow: hidden;
  background: var(--steel-dark);
}
.expert-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.5s ease;
}
.expert-card:hover .expert-photo img { transform: scale(1.05); }
.expert-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--brand-orange);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 3px;
}
.expert-info { padding: 20px; }
.expert-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.expert-role {
  font-size: 13px;
  color: var(--brand-orange);
  font-weight: 600;
  margin-bottom: 12px;
}
.expert-bio {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}
.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.award-tag {
  background: rgba(232,80,10,0.1);
  border: 1px solid rgba(232,80,10,0.2);
  color: var(--brand-orange);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
}
.expert-actions {
  display: flex;
  gap: 10px;
}
.btn-expert {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-expert-primary {
  background: var(--brand-orange);
  color: #fff;
}
.btn-expert-primary:hover { background: var(--brand-orange-light); color: #fff; }
.btn-expert-secondary {
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text-secondary);
}
.btn-expert-secondary:hover { border-color: var(--brand-orange); color: var(--brand-orange); }

/* ---------- 合作品牌Logo墙 ---------- */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--steel-dark);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  letter-spacing: 0.5px;
}
.partner-item:hover {
  border-color: var(--brand-orange);
  color: var(--brand-orange);
  background: rgba(232,80,10,0.08);
}

/* ---------- 用户评价 ---------- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--card-bg);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: var(--transition);
}
.review-card:hover {
  border-color: rgba(232,80,10,0.3);
  transform: translateY(-3px);
}
.review-quote {
  font-size: 40px;
  color: var(--brand-orange);
  line-height: 1;
  margin-bottom: 12px;
  opacity: 0.6;
  font-family: Georgia, serif;
}
.review-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 700; color: var(--text-primary); }
.review-info { font-size: 12px; color: var(--text-muted); }
.review-stars {
  display: flex;
  gap: 3px;
  margin-top: 4px;
}
.star { color: #FFB800; font-size: 12px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--brand-orange); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  background: var(--card-bg);
  transition: var(--transition);
  gap: 16px;
}
.faq-question:hover { background: rgba(232,80,10,0.05); }
.faq-q-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 18px;
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-icon {
  background: var(--brand-orange);
  border-color: var(--brand-orange);
  color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  display: none;
  padding: 0 24px 20px;
  background: var(--card-bg);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid rgba(255,255,255,0.04);
}
.faq-item.open .faq-answer { display: block; }

/* ---------- AI赋能区块 ---------- */
.ai-section {
  background: linear-gradient(135deg, var(--carbon-mid) 0%, rgba(232,80,10,0.05) 100%);
  border-top: 1px solid rgba(232,80,10,0.15);
  border-bottom: 1px solid rgba(232,80,10,0.15);
}
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.ai-text .section-header { text-align: left; margin-bottom: 32px; }
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.ai-feature-icon {
  width: 44px;
  height: 44px;
  background: rgba(232,80,10,0.12);
  border: 1px solid rgba(232,80,10,0.25);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.ai-feature-text h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.ai-feature-text p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.ai-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--steel-dark);
}
.ai-visual img { width: 100%; height: 100%; object-fit: cover; }
.ai-visual-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(232,80,10,0.2), transparent);
  display: flex;
  align-items: flex-end;
  padding: 24px;
}
.ai-visual-badge {
  background: rgba(13,17,23,0.9);
  border: 1px solid var(--brand-orange);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-primary);
}
.ai-visual-badge strong { color: var(--brand-orange); display: block; font-size: 16px; margin-bottom: 2px; }

/* ---------- 社区功能 ---------- */
.community-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  justify-content: center;
}
.tab-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid rgba(255,255,255,0.1);
  transition: var(--transition);
  cursor: pointer;
}
.tab-btn:hover,
.tab-btn.active {
  background: var(--brand-orange);
  color: #fff;
  border-color: var(--brand-orange);
}

/* ---------- 联系区块 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.contact-icon {
  width: 48px;
  height: 48px;
  background: rgba(232,80,10,0.12);
  border: 1px solid rgba(232,80,10,0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.contact-item-title { font-size: 14px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.contact-item-val { font-size: 13px; color: var(--text-secondary); }
.qr-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.qr-item { text-align: center; }
.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  margin-bottom: 8px;
}
.qr-item p { font-size: 12px; color: var(--text-muted); }

/* ---------- 社交分享 ---------- */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 32px 0;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-secondary);
}
.share-btn:hover { transform: translateY(-2px); color: #fff; }
.share-wechat:hover { background: #07C160; border-color: #07C160; }
.share-weibo:hover { background: #E6162D; border-color: #E6162D; }
.share-douyin:hover { background: #000; border-color: #69C9D0; }
.share-bilibili:hover { background: #00A1D6; border-color: #00A1D6; }

/* ---------- 页脚 ---------- */
footer.site-footer {
  background: var(--carbon-black);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.social-link {
  width: 36px;
  height: 36px;
  background: var(--steel-dark);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--text-muted);
  transition: var(--transition);
}
.social-link:hover {
  background: var(--brand-orange);
  border-color: var(--brand-orange);
  color: #fff;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(232,80,10,0.3);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-links a::before {
  content: '›';
  color: var(--brand-orange);
  opacity: 0;
  transition: opacity 0.2s;
}
.footer-links a:hover { color: var(--text-primary); padding-left: 4px; }
.footer-links a:hover::before { opacity: 1; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.footer-icp a { color: var(--text-muted); }
.footer-icp a:hover { color: var(--brand-orange); }
.update-time { color: var(--text-muted); }
.update-time span { color: var(--brand-orange); }

/* ---------- 内页Hero ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--carbon-mid) 0%, rgba(232,80,10,0.08) 100%);
  border-bottom: 1px solid rgba(232,80,10,0.15);
  padding: 60px 0;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.page-hero h1 .brand { color: var(--brand-orange); }
.page-hero p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- 数据统计横幅 ---------- */
.stats-banner {
  background: linear-gradient(90deg, var(--brand-orange-dark), var(--brand-orange));
  padding: 40px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stats-item .num {
  font-size: 36px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
}
.stats-item .label {
  font-size: 13px;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.5px;
}

/* ---------- 标签页内容 ---------- */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---------- 工具提示 ---------- */
[data-tooltip] { position: relative; }
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--steel-dark);
  color: var(--text-primary);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  border: 1px solid var(--border-color);
  z-index: 100;
}
[data-tooltip]:hover::after { opacity: 1; }

/* ---------- 加载动画 ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--steel-dark) 25%, var(--steel-mid) 50%, var(--steel-dark) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------- 滚动动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 干扰标签隐藏 ---------- */
div[id^="n"],
div[class^="n"] {
  display: none !important;
  visibility: hidden !important;
  height: 0 !important;
  overflow: hidden !important;
  position: absolute !important;
  left: -9999px !important;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .ai-grid { grid-template-columns: 1fr; }
  .ai-visual { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-list, .header-actions .btn-join { display: none; }
  .hamburger { display: flex; }
  .hero-banner { min-height: 420px; }
  .hero-stats { gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .video-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; text-align: center; }
  .mobile-menu { display: flex; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-content { padding: 60px 16px 100px; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stats-item .num { font-size: 28px; }
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9998;
  background: rgba(13,17,23,0.98);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  padding: 12px 40px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.mobile-menu a:hover { color: var(--brand-orange); background: rgba(232,80,10,0.1); }
.mobile-menu-close {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 28px;
  color: var(--text-secondary);
  cursor: pointer;
}

/* ---------- 打印样式 ---------- */
@media print {
  header, footer, .video-modal, .mobile-menu { display: none; }
  body { background: #fff; color: #000; }
}