/* ========================================
   抖阴 修车改装视频社区 - 全局样式
   域名: bx612.cn
   原创设计：保时捷橙黑赛道风格
   ======================================== */

/* CSS变量 */
:root {
  --primary: #E85D04;
  --primary-dark: #C44D00;
  --primary-light: #FF7A2F;
  --accent: #FFB703;
  --dark: #0D0D0D;
  --dark-2: #1A1A1A;
  --dark-3: #242424;
  --dark-4: #2E2E2E;
  --gray: #888888;
  --gray-light: #BBBBBB;
  --white: #FFFFFF;
  --white-90: rgba(255,255,255,0.9);
  --white-60: rgba(255,255,255,0.6);
  --white-20: rgba(255,255,255,0.2);
  --white-10: rgba(255,255,255,0.1);
  --border: rgba(255,255,255,0.08);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-orange: 0 4px 20px rgba(232,93,4,0.3);
  --radius: 12px;
  --radius-sm: 6px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --font: 'PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;
}

/* 重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--dark);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
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 { font-family: inherit; }

/* 进度条 */
.W5XPLXWP {
  position: fixed; top: 0; left: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 9999; width: 0%; transition: width 0.2s;
}

/* 回到顶部 */
.back-top {
  position: fixed; bottom: 30px; right: 30px;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--primary); color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; cursor: pointer; z-index: 999;
  opacity: 0; transform: translateY(20px);
  transition: var(--transition); box-shadow: var(--shadow-orange);
}
.back-top.show { opacity: 1; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ── 导航栏 ── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,13,13,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.site-nav.scrolled {
  background: rgba(13,13,13,0.98);
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 24px;
  display: flex; align-items: center; gap: 32px;
  height: 68px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0;
}
.nav-logo-img {
  width: 42px; height: 42px; border-radius: 8px; object-fit: contain;
}
.nav-logo-text {
  font-size: 22px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: -0.5px;
}
.nav-links {
  display: flex; align-items: center; gap: 4px; flex: 1;
}
.nav-link {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; color: var(--gray-light);
  transition: var(--transition); white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--white); background: var(--white-10);
}
.nav-link.active { color: var(--primary); }

/* 搜索框 */
.nav-search {
  position: relative; flex-shrink: 0;
}
.nav-search input {
  width: 200px; padding: 8px 16px 8px 38px;
  background: var(--white-10); border: 1px solid var(--border);
  border-radius: 20px; color: var(--white); font-size: 13px;
  transition: var(--transition); outline: none;
}
.nav-search input::placeholder { color: var(--gray); }
.nav-search input:focus {
  width: 240px; border-color: var(--primary);
  background: var(--white-20);
}
.nav-search .search-icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--gray); font-size: 14px; pointer-events: none;
}
.nav-search .search-btn {
  position: absolute; right: 0; top: 0; bottom: 0;
  padding: 0 14px; background: var(--primary);
  border-radius: 0 20px 20px 0; color: var(--white);
  font-size: 13px; transition: var(--transition);
}
.nav-search .search-btn:hover { background: var(--primary-dark); }

.nav-cta {
  padding: 9px 20px; background: var(--primary);
  border-radius: 20px; font-size: 14px; font-weight: 600;
  color: var(--white); transition: var(--transition);
  white-space: nowrap; flex-shrink: 0;
}
.nav-cta:hover {
  background: var(--primary-dark);
  box-shadow: var(--shadow-orange);
  transform: translateY(-1px);
}
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  padding: 8px; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--white); border-radius: 2px;
  transition: var(--transition);
}

/* ── 搜索栏（导航下方独立区域）── */
.search-bar-section {
  background: var(--dark-2);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  margin-top: 68px;
}
.search-bar-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 12px;
}
.search-bar-wrap {
  flex: 1; position: relative; max-width: 680px;
}
.search-bar-wrap input {
  width: 100%; padding: 12px 52px 12px 20px;
  background: var(--dark-3); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--white); font-size: 15px;
  outline: none; transition: var(--transition);
}
.search-bar-wrap input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,93,4,0.15);
}
.search-bar-wrap input::placeholder { color: var(--gray); }
.search-bar-btn {
  position: absolute; right: 0; top: 0; bottom: 0;
  padding: 0 20px; background: var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--white); font-size: 15px; font-weight: 600;
  transition: var(--transition);
}
.search-bar-btn:hover { background: var(--primary-dark); }
.search-hot-tags {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 13px; color: var(--gray);
}
.search-hot-tags span { color: var(--gray-light); }
.search-hot-tag {
  padding: 4px 12px; background: var(--dark-3);
  border: 1px solid var(--border); border-radius: 14px;
  color: var(--gray-light); font-size: 12px; cursor: pointer;
  transition: var(--transition);
}
.search-hot-tag:hover { border-color: var(--primary); color: var(--primary); }

/* ── Hero Banner ── */
.hero-banner {
  position: relative; min-height: 600px;
  display: flex; align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
}
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover;
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero-banner:hover .hero-bg img { transform: scale(1); }
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(
    135deg,
    rgba(13,13,13,0.92) 0%,
    rgba(13,13,13,0.7) 50%,
    rgba(232,93,4,0.15) 100%
  );
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto; padding: 80px 24px;
  width: 100%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; background: rgba(232,93,4,0.2);
  border: 1px solid rgba(232,93,4,0.4); border-radius: 20px;
  font-size: 13px; color: var(--primary); font-weight: 600;
  margin-bottom: 24px; letter-spacing: 0.5px;
}
.hero-badge::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: var(--primary); animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 900; line-height: 1.1;
  margin-bottom: 16px; letter-spacing: -1px;
}
.hero-title .brand {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 22px);
  color: var(--white-90); margin-bottom: 12px; font-weight: 500;
}
.hero-desc {
  font-size: 15px; color: var(--white-60);
  max-width: 560px; margin-bottom: 36px; line-height: 1.8;
}
.hero-btns {
  display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px;
}
.btn-primary {
  padding: 14px 32px; background: var(--primary);
  border-radius: var(--radius); font-size: 16px; font-weight: 700;
  color: var(--white); transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: var(--shadow-orange);
  transform: translateY(-2px);
}
.btn-outline {
  padding: 14px 32px; border: 2px solid var(--white-60);
  border-radius: var(--radius); font-size: 16px; font-weight: 700;
  color: var(--white); transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-outline:hover {
  border-color: var(--primary); color: var(--primary);
  transform: translateY(-2px);
}
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: left; }
.hero-stat-num {
  font-size: 32px; font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1;
}
.hero-stat-label {
  font-size: 13px; color: var(--gray-light); margin-top: 4px;
}

/* ── 通用区块 ── */
.section {
  padding: 80px 24px;
}
.section-alt { background: var(--dark-2); }
.section-inner {
  max-width: 1280px; margin: 0 auto;
}
.section-header {
  text-align: center; margin-bottom: 56px;
}
.section-label {
  display: inline-block; padding: 4px 14px;
  background: rgba(232,93,4,0.15); border: 1px solid rgba(232,93,4,0.3);
  border-radius: 14px; font-size: 12px; font-weight: 700;
  color: var(--primary); letter-spacing: 1px; text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 800; line-height: 1.2; margin-bottom: 16px;
}
.section-title .brand {
  color: var(--primary);
}
.section-desc {
  font-size: 16px; color: var(--gray-light);
  max-width: 600px; margin: 0 auto; line-height: 1.8;
}

/* ── 视频卡片 ── */
.video-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.video-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.LsaW2 {
  background: var(--dark-3);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border);
  cursor: pointer;
}
.LsaW2:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.3);
}
.eBUfCM7y {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9; background: var(--dark-4);
}
.eBUfCM7y img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition);
}
.LsaW2:hover .eBUfCM7y img { transform: scale(1.08); }
.33rdDoU {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0);
  transition: var(--transition);
}
.LsaW2:hover .33rdDoU {
  background: rgba(0,0,0,0.4);
}
.6imMI3 {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(232,93,4,0.9);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: scale(0.7);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(232,93,4,0.5);
}
.LsaW2:hover .6imMI3 {
  opacity: 1; transform: scale(1);
}
.play-triangle {
  width: 0; height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 18px solid var(--white);
  margin-left: 4px;
}
.9hDEl4C {
  position: absolute; bottom: 8px; right: 8px;
  padding: 2px 8px; background: rgba(0,0,0,0.8);
  border-radius: 4px; font-size: 12px; font-weight: 600;
  color: var(--white);
}
.mp31o {
  position: absolute; top: 8px; right: 8px;
  padding: 2px 7px; background: var(--primary);
  border-radius: 4px; font-size: 11px; font-weight: 700;
  color: var(--white);
}
.O1c41HN {
  position: absolute; top: 8px; left: 8px;
  padding: 2px 8px; background: rgba(255,183,3,0.9);
  border-radius: 4px; font-size: 11px; font-weight: 700;
  color: var(--dark);
}
.video-body {
  padding: 14px 16px;
}
.video-category {
  font-size: 11px; color: var(--primary); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px;
}
.video-title {
  font-size: 14px; font-weight: 700; line-height: 1.4;
  margin-bottom: 8px; color: var(--white);
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.jK32RaI {
  display: flex; align-items: center; gap: 12px;
  font-size: 12px; color: var(--gray);
}
.video-stats {
  display: flex; align-items: center; gap: 12px;
  font-size: 12px; color: var(--gray); margin-top: 6px;
}

/* ── 专家卡片 ── */
.eQxn2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.j459A8E {
  background: var(--dark-3);
  border-radius: var(--radius-lg);
  padding: 32px 24px; text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.j459A8E:hover {
  transform: translateY(-6px);
  border-color: rgba(232,93,4,0.3);
  box-shadow: var(--shadow);
}
.pwvk2P3 {
  width: 100px; height: 100px; border-radius: 50%;
  object-fit: cover; margin: 0 auto 16px;
  border: 3px solid var(--primary);
  box-shadow: 0 0 0 6px rgba(232,93,4,0.1);
}
.0s0l79JC {
  font-size: 18px; font-weight: 800; margin-bottom: 4px;
}
.9Iqfv {
  font-size: 13px; color: var(--primary); font-weight: 600;
  margin-bottom: 12px;
}
.2DqoYny9 {
  font-size: 13px; color: var(--gray-light); line-height: 1.7;
  margin-bottom: 16px;
}
.c1nAXo {
  display: flex; flex-wrap: wrap; gap: 6px; justify-content: center;
  margin-bottom: 20px;
}
.m1zrCp {
  padding: 3px 10px; background: var(--white-10);
  border-radius: 12px; font-size: 11px; color: var(--gray-light);
}

/* ── AI赋能 ── */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: var(--dark-3);
  border-radius: var(--radius);
  padding: 32px 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.ai-card::before {
  content: ''; position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.ai-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(232,93,4,0.3);
}
.ai-icon {
  font-size: 40px; margin-bottom: 16px;
}
.ai-title {
  font-size: 18px; font-weight: 700; margin-bottom: 10px;
}
.ai-desc {
  font-size: 14px; color: var(--gray-light); line-height: 1.7;
}

/* ── 社区功能 ── */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.community-card {
  background: var(--dark-3);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.community-img {
  aspect-ratio: 16/9; overflow: hidden;
}
.community-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition);
}
.community-card:hover .community-img img { transform: scale(1.06); }
.community-body {
  padding: 20px;
}
.community-title {
  font-size: 16px; font-weight: 700; margin-bottom: 8px;
}
.community-tag {
  display: inline-block; padding: 3px 10px;
  background: rgba(232,93,4,0.15); border-radius: 12px;
  font-size: 11px; color: var(--primary); font-weight: 600;
  margin-bottom: 10px;
}

/* ── FAQ ── */
.faq-item {
  background: var(--dark-3);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,93,4,0.3); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; cursor: pointer;
  font-size: 16px; font-weight: 600; gap: 16px;
}
.faq-icon {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--white-10); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; transition: var(--transition);
  color: var(--primary);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: var(--white); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
}
.faq-answer p {
  font-size: 14px; color: var(--gray-light);
  line-height: 1.8; padding-bottom: 20px;
}
.faq-item.open .faq-answer { max-height: 300px; }

/* ── 用户评论 ── */
.review-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.WT2AbCw {
  background: var(--dark-3);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.WT2AbCw:hover {
  transform: translateY(-4px);
  border-color: rgba(232,93,4,0.2);
}
.review-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
}
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; color: var(--white); flex-shrink: 0;
}
.review-info { flex: 1; }
.review-name { font-size: 14px; font-weight: 700; margin-bottom: 2px; }
.review-role { font-size: 12px; color: var(--gray); }
.review-stars {
  color: var(--accent); font-size: 13px; margin-bottom: 10px;
}
.B5jXN05 {
  font-size: 13px; color: var(--gray-light); line-height: 1.7;
}

/* ── 合作品牌 ── */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.partner-item {
  background: var(--dark-3);
  border-radius: var(--radius);
  padding: 20px 16px; text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.partner-item:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
}
.partner-logo {
  font-size: 28px; margin-bottom: 8px;
}
.partner-name {
  font-size: 12px; color: var(--gray-light); font-weight: 600;
}

/* ── 联系我们 ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px; align-items: start;
}
.contact-info-card {
  background: var(--dark-3);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--border);
}
.contact-info-title {
  font-size: 20px; font-weight: 800; margin-bottom: 24px;
  padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
.contact-list { display: flex; flex-direction: column; gap: 16px; }
.contact-row {
  display: flex; align-items: flex-start; gap: 14px;
}
.contact-icon {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: rgba(232,93,4,0.15); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.contact-label {
  font-size: 12px; color: var(--gray); margin-bottom: 2px;
}
.contact-value {
  font-size: 14px; font-weight: 600; color: var(--white);
}

/* ── 加入社区 ── */
.join-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.join-step {
  background: var(--dark-3);
  border-radius: var(--radius);
  padding: 28px 20px; text-align: center;
  border: 1px solid var(--border);
  position: relative;
}
.join-step::after {
  content: '→';
  position: absolute; right: -14px; top: 50%;
  transform: translateY(-50%);
  color: var(--primary); font-size: 20px; font-weight: 700;
}
.join-step:last-child::after { display: none; }
.join-icon {
  font-size: 36px; margin-bottom: 14px;
}
.join-title {
  font-size: 15px; font-weight: 700; margin-bottom: 8px;
}
.join-desc {
  font-size: 13px; color: var(--gray-light); line-height: 1.6;
}

/* ── 统计数字 ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.V9O6dvk1 {
  text-align: center; padding: 32px 20px;
  background: var(--dark-3);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.stat-num {
  font-size: 40px; font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1; margin-bottom: 8px;
}
.8mDAm {
  font-size: 14px; color: var(--gray-light);
}

/* ── 过滤器 ── */
.filter-bar {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px;
}
.filter-btn {
  padding: 8px 18px; border-radius: 20px;
  font-size: 13px; font-weight: 600;
  background: var(--dark-3); border: 1px solid var(--border);
  color: var(--gray-light); transition: var(--transition);
  cursor: pointer;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--primary); border-color: var(--primary);
  color: var(--white);
}

/* ── 面包屑 ── */
.breadcrumb {
  padding: 16px 24px;
  background: var(--dark-2);
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--gray);
}
.breadcrumb-inner a { color: var(--gray); transition: var(--transition); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner .sep { color: var(--dark-4); }
.breadcrumb-inner .current { color: var(--white-90); }

/* ── 页脚 ── */
.site-footer {
  background: var(--dark-2);
  border-top: 1px solid var(--border);
  padding: 60px 24px 0;
}
.footer-inner {
  max-width: 1280px; margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px; padding-bottom: 48px;
}
.footer-brand {}
.footer-logo {
  display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
}
.footer-logo img {
  width: 40px; height: 40px; border-radius: 8px;
}
.footer-logo span {
  font-size: 20px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-desc {
  font-size: 13px; color: var(--gray); line-height: 1.8;
  margin-bottom: 20px; max-width: 280px;
}
.footer-socials {
  display: flex; gap: 10px;
}
.footer-social {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  background: var(--white-10); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; transition: var(--transition);
}
.footer-social:hover {
  background: var(--primary); border-color: var(--primary);
  transform: translateY(-2px);
}
.footer-col-title {
  font-size: 14px; font-weight: 700; margin-bottom: 16px;
  color: var(--white);
}
.footer-links {
  display: flex; flex-direction: column; gap: 10px;
}
.footer-link {
  font-size: 13px; color: var(--gray); transition: var(--transition);
}
.footer-link:hover { color: var(--primary); padding-left: 4px; }
.footer-contact {
  display: flex; flex-direction: column; gap: 10px;
}
.footer-contact-row {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--gray);
}
.footer-contact-row span:first-child { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-copyright {
  font-size: 13px; color: var(--gray);
}
.footer-icp {
  font-size: 12px; color: var(--gray);
}
.footer-update {
  font-size: 12px; color: var(--gray);
}

/* ── 视频弹窗 ── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 9000;
  background: rgba(0,0,0,0.9);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: var(--transition);
}
.modal-overlay.show { opacity: 1; pointer-events: all; }
.modal-content {
  position: relative; width: 90%; max-width: 900px;
  background: var(--dark-2); border-radius: var(--radius-lg);
  overflow: hidden; transform: scale(0.9);
  transition: var(--transition);
}
.modal-overlay.show .modal-content { transform: scale(1); }
.modal-close {
  position: absolute; top: 16px; right: 16px; z-index: 1;
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(0,0,0,0.6); color: var(--white);
  font-size: 20px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--transition);
}
.modal-close:hover { background: var(--primary); }
.modal-video {
  aspect-ratio: 16/9; background: var(--dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: var(--gray);
}

/* ── 动画 ── */
.animate-in {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-in.visible { opacity: 1; transform: translateY(0); }
.fade-up { animation: fadeUp 0.6s ease forwards; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Toast ── */
.toast-container {
  position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%);
  z-index: 9999; display: flex; flex-direction: column; gap: 8px;
  pointer-events: none;
}
.toast-msg {
  padding: 12px 24px; background: var(--dark-3);
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; color: var(--white);
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes toastOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}

/* ── 内页 Hero ── */
.page-hero {
  padding: 80px 24px 60px;
  background: linear-gradient(135deg, var(--dark-2), var(--dark));
  border-bottom: 1px solid var(--border);
  margin-top: 68px;
}
.page-hero-inner {
  max-width: 1280px; margin: 0 auto;
}
.page-hero h1 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900; margin-bottom: 12px;
}
.page-hero h1 .brand { color: var(--primary); }
.page-hero p {
  font-size: 16px; color: var(--gray-light);
  max-width: 600px; line-height: 1.8;
}

/* ── 响应式 ── */
@media (max-width: 1100px) {
  .video-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .review-grid  { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 900px) {
  .video-grid-4, .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .eQxn2  { grid-template-columns: repeat(2, 1fr); }
  .ai-grid      { grid-template-columns: repeat(2, 1fr); }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid   { grid-template-columns: repeat(2, 1fr); }
  .join-grid    { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .nav-links    { display: none; }
  .nav-search   { display: none; }
  .nav-toggle   { display: flex; }
  .search-hot-tags { display: none; }
}
@media (max-width: 600px) {
  .video-grid-4, .video-grid-3, .video-grid-2 { grid-template-columns: 1fr; }
  .eQxn2  { grid-template-columns: 1fr; }
  .ai-grid      { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .stats-grid   { grid-template-columns: repeat(2, 1fr); }
  .join-grid    { grid-template-columns: 1fr; }
  .join-step::after { display: none; }
  .review-grid  { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .hero-stats   { gap: 20px; }
  .hero-btns    { flex-direction: column; }
  .section      { padding: 56px 16px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ── 打印优化 ── */
@media print {
  .site-nav, .back-top, .modal-overlay, .W5XPLXWP { display: none; }
  body { background: white; color: black; }
}