/* =========================================
   暗网 - 汽车改装视频社区
   原创主题：赛道橙 + 深海蓝
   域名：y05lns.cn
   ========================================= */

/* === 全局重置与变量 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --brand-orange: #FF6B1A;
  --brand-dark:   #0D1B2A;
  --brand-navy:   #1A2E42;
  --brand-mid:    #243B55;
  --brand-accent: #FFB347;
  --brand-white:  #F5F7FA;
  --brand-gray:   #8A9BB0;
  --brand-light:  #E8EDF3;
  --text-main:    #1A2E42;
  --text-muted:   #5A7080;
  --radius-sm:    6px;
  --radius-md:    12px;
  --radius-lg:    20px;
  --shadow-sm:    0 2px 8px rgba(13,27,42,.12);
  --shadow-md:    0 6px 24px rgba(13,27,42,.18);
  --shadow-lg:    0 12px 48px rgba(13,27,42,.28);
  --transition:   0.3s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  background: var(--brand-white);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--brand-orange); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--brand-accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* === 干扰标签隐藏（不影响布局） === */
.kkt-noise, [data-kkt-junk] {
  display: none !important;
  visibility: hidden !important;
  position: absolute !important;
  width: 0 !important;
  height: 0 !important;
  overflow: hidden !important;
  pointer-events: none !important;
}

/* === 容器 === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 24px; }

/* === 按钮系统 === */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 2px solid transparent; transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--brand-orange); color: #fff;
  border-color: var(--brand-orange);
}
.btn-primary:hover {
  background: #e55a0a; border-color: #e55a0a; color: #fff;
  transform: translateY(-2px); box-shadow: 0 8px 20px rgba(255,107,26,.35);
}
.btn-outline {
  background: transparent; color: var(--brand-orange);
  border-color: var(--brand-orange);
}
.btn-outline:hover {
  background: var(--brand-orange); color: #fff;
  transform: translateY(-2px);
}
.btn-dark {
  background: var(--brand-dark); color: #fff;
  border-color: var(--brand-dark);
}
.btn-dark:hover { background: var(--brand-navy); border-color: var(--brand-navy); color: #fff; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-lg { padding: 16px 40px; font-size: 17px; }

/* === 顶部公告栏 === */
.top-bar {
  background: var(--brand-dark); color: var(--brand-gray);
  font-size: 13px; padding: 8px 0; text-align: center;
}
.top-bar a { color: var(--brand-orange); }
.top-bar .top-bar-inner {
  display: flex; justify-content: space-between; align-items: center;
}

/* === 导航栏 === */
.site-header {
  background: var(--brand-dark);
  position: sticky; top: 0; z-index: 1000;
  box-shadow: 0 2px 16px rgba(0,0,0,.4);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 24px;
}
.nav-brand {
  display: flex; align-items: center; gap: 12px; flex-shrink: 0;
}
.nav-logo {
  width: 42px; height: 42px; border-radius: 8px;
  object-fit: cover;
}
.nav-brand-name {
  font-size: 22px; font-weight: 800; color: #fff;
  letter-spacing: -0.5px;
}
.nav-brand-name span { color: var(--brand-orange); }
.nav-menu {
  display: flex; align-items: center; gap: 4px;
}
.nav-menu a {
  color: #cdd8e3; font-size: 14px; font-weight: 500;
  padding: 8px 14px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--brand-orange); background: rgba(255,107,26,.12);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none; background: none; border: none;
  color: #fff; font-size: 22px; cursor: pointer; padding: 4px;
}

/* === 搜索框 === */
.search-bar-wrap {
  background: var(--brand-navy); padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.search-bar-inner {
  display: flex; align-items: center; gap: 12px; max-width: 680px; margin: 0 auto;
}
.search-input {
  flex: 1; padding: 10px 18px; border-radius: 24px;
  border: 2px solid rgba(255,107,26,.3);
  background: rgba(255,255,255,.06); color: #fff;
  font-size: 14px; outline: none;
  transition: border-color var(--transition);
}
.search-input::placeholder { color: var(--brand-gray); }
.search-input:focus { border-color: var(--brand-orange); }
.search-btn {
  padding: 10px 22px; background: var(--brand-orange);
  color: #fff; border: none; border-radius: 24px;
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: background var(--transition);
}
.search-btn:hover { background: #e55a0a; }
.search-hot { font-size: 12px; color: var(--brand-gray); white-space: nowrap; }
.search-hot span {
  color: var(--brand-orange); cursor: pointer; margin-left: 6px;
}
.search-hot span:hover { text-decoration: underline; }
.search-suggest {
  position: absolute; top: 100%; left: 0; right: 0;
  background: #1A2E42; border: 1px solid rgba(255,107,26,.3);
  border-radius: 12px; z-index: 200; max-height: 200px; overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
}
.search-suggest-item {
  padding: 10px 18px; font-size: 14px; color: #ccc;
  cursor: pointer; border-bottom: 1px solid rgba(255,255,255,.05);
}
.search-suggest-item:hover { background: rgba(255,107,26,.1); color: #fff; }

/* === 英雄区 === */
.hero {
  position: relative; min-height: 580px;
  display: flex; align-items: center;
  background: linear-gradient(135deg, #0D1B2A 0%, #1A2E42 50%, #0D1B2A 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/hero-bg.jpg');
  background-size: cover; background-position: center;
  opacity: .28; z-index: 0;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(13,27,42,.92) 40%, rgba(13,27,42,.3) 100%);
  z-index: 1;
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 620px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,107,26,.18); border: 1px solid rgba(255,107,26,.4);
  color: var(--brand-orange); font-size: 13px; font-weight: 600;
  padding: 6px 16px; border-radius: 20px; margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 56px); font-weight: 900;
  color: #fff; line-height: 1.15; margin-bottom: 16px;
}
.hero h1 em { color: var(--brand-orange); font-style: normal; }
.hero-sub {
  font-size: 17px; color: #a8bdd0; margin-bottom: 32px; line-height: 1.6;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 32px; margin-top: 48px; padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.hero-stat-num {
  font-size: 28px; font-weight: 800; color: var(--brand-orange);
}
.hero-stat-label { font-size: 13px; color: var(--brand-gray); margin-top: 2px; }

/* === 通用区块标题 === */
.section { padding: 72px 0; }
.section-alt { background: var(--brand-light); }
.section-dark { background: var(--brand-dark); }
.section-navy { background: var(--brand-navy); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block; background: rgba(255,107,26,.12);
  color: var(--brand-orange); font-size: 12px; font-weight: 700;
  padding: 4px 14px; border-radius: 20px; letter-spacing: 1px;
  text-transform: uppercase; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 3.5vw, 38px); font-weight: 800;
  color: var(--text-main); line-height: 1.25;
}
.section-dark .section-title,
.section-navy .section-title { color: #fff; }
.section-title span { color: var(--brand-orange); }
.section-desc {
  font-size: 16px; color: var(--text-muted); margin-top: 12px;
  max-width: 560px; margin-left: auto; margin-right: auto;
}
.section-dark .section-desc,
.section-navy .section-desc { color: var(--brand-gray); }

/* === 视频卡片网格 === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff; border-radius: var(--radius-md);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: all var(--transition); cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg);
}
.video-thumb {
  position: relative; padding-top: 56.25%; overflow: hidden;
}
.video-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; transition: transform var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(13,27,42,.45);
  opacity: 0; transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--brand-orange);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(255,107,26,.5);
  transition: transform var(--transition);
}
.video-card:hover .play-icon { transform: scale(1.1); }
.play-icon::after {
  content: ''; border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(0,0,0,.75); color: #fff;
  font-size: 12px; padding: 2px 8px; border-radius: 4px;
}
.video-tag {
  position: absolute; top: 10px; left: 10px;
  background: var(--brand-orange); color: #fff;
  font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 4px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 15px; font-weight: 700; color: var(--text-main);
  line-height: 1.4; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 12px; color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author { font-size: 13px; color: var(--brand-orange); font-weight: 600; margin-bottom: 6px; }

/* === 业务模块卡片 === */
.service-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.service-card {
  background: var(--brand-navy); border-radius: var(--radius-md);
  padding: 32px 28px; border: 1px solid rgba(255,255,255,.06);
  transition: all var(--transition);
}
.service-card:hover {
  border-color: var(--brand-orange);
  transform: translateY(-4px); box-shadow: var(--shadow-md);
}
.service-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: rgba(255,107,26,.15);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; margin-bottom: 20px;
}
.service-card h3 {
  font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 10px;
}
.service-card p { font-size: 14px; color: var(--brand-gray); line-height: 1.6; }
.service-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.service-tag {
  font-size: 11px; padding: 3px 10px; border-radius: 12px;
  background: rgba(255,107,26,.12); color: var(--brand-orange);
  border: 1px solid rgba(255,107,26,.25);
}

/* === 娱乐专区 === */
.entertain-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.entertain-card {
  border-radius: var(--radius-md); overflow: hidden;
  position: relative; cursor: pointer;
  aspect-ratio: 3/4;
}
.entertain-card img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition);
}
.entertain-card:hover img { transform: scale(1.08); }
.entertain-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(13,27,42,.85) 0%, transparent 50%);
}
.entertain-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 20px 16px;
}
.entertain-info h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.entertain-info p { font-size: 12px; color: rgba(255,255,255,.7); }
.entertain-play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,107,26,.8);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--transition);
}
.entertain-card:hover .entertain-play { opacity: 1; }
.entertain-play::after {
  content: ''; border-style: solid;
  border-width: 8px 0 8px 14px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}

/* === AI赋能区 === */
.ai-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
  align-items: center;
}
.ai-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.ai-features { display: flex; flex-direction: column; gap: 24px; }
.ai-feature-item {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 20px; border-radius: var(--radius-md);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.06);
  transition: border-color var(--transition);
}
.ai-feature-item:hover { border-color: rgba(255,107,26,.4); }
.ai-feature-icon {
  width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
  background: rgba(255,107,26,.15);
  display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.ai-feature-text h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.ai-feature-text p { font-size: 13px; color: var(--brand-gray); line-height: 1.6; }

/* === 社区功能 === */
.community-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.community-card {
  background: #fff; border-radius: var(--radius-md);
  padding: 28px 24px; text-align: center;
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  transition: all var(--transition);
}
.community-card:hover {
  border-color: var(--brand-orange);
  transform: translateY(-4px); box-shadow: var(--shadow-md);
}
.community-icon { font-size: 40px; margin-bottom: 16px; }
.community-card h3 { font-size: 17px; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.community-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.community-count {
  display: inline-block; margin-top: 12px;
  font-size: 13px; font-weight: 700; color: var(--brand-orange);
}

/* === 专家展示 === */
.experts-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.expert-card {
  background: var(--brand-navy); border-radius: var(--radius-md);
  overflow: hidden; border: 1px solid rgba(255,255,255,.06);
  transition: all var(--transition);
}
.expert-card:hover {
  border-color: var(--brand-orange); transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.expert-photo {
  width: 100%; aspect-ratio: 3/4; object-fit: cover; object-position: top;
  max-height: 280px;
}
.expert-info { padding: 20px; }
.expert-name { font-size: 18px; font-weight: 800; color: #fff; margin-bottom: 4px; }
.expert-title { font-size: 13px; color: var(--brand-orange); margin-bottom: 12px; }
.expert-desc { font-size: 13px; color: var(--brand-gray); line-height: 1.6; margin-bottom: 16px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.expert-award {
  font-size: 11px; padding: 3px 10px; border-radius: 12px;
  background: rgba(255,179,71,.12); color: var(--brand-accent);
  border: 1px solid rgba(255,179,71,.25);
}
.expert-actions { display: flex; gap: 10px; }

/* === 合作品牌 === */
.partners-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px;
  align-items: center;
}
.partner-item {
  background: var(--brand-navy); border-radius: var(--radius-sm);
  padding: 16px; text-align: center;
  border: 1px solid rgba(255,255,255,.06);
  transition: all var(--transition);
}
.partner-item:hover { border-color: var(--brand-orange); }
.partner-name { font-size: 13px; font-weight: 700; color: var(--brand-gray); }

/* === How-To 指南 === */
.howto-steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.howto-step {
  text-align: center; padding: 28px 20px;
  background: #fff; border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm); position: relative;
}
.howto-step::after {
  content: '→'; position: absolute; right: -16px; top: 50%;
  transform: translateY(-50%); font-size: 20px; color: var(--brand-orange);
}
.howto-step:last-child::after { display: none; }
.step-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--brand-orange); color: #fff;
  font-size: 20px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.howto-step h4 { font-size: 15px; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.howto-step p { font-size: 13px; color: var(--text-muted); }

/* === 联系我们 === */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start;
}
.contact-info h3 { font-size: 22px; font-weight: 800; color: #fff; margin-bottom: 20px; }
.contact-item {
  display: flex; gap: 16px; align-items: flex-start;
  margin-bottom: 20px;
}
.contact-icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  background: rgba(255,107,26,.15);
  display: flex; align-items: center; justify-content: center; font-size: 20px;
}
.contact-item h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.contact-item p { font-size: 13px; color: var(--brand-gray); }
.contact-qr { display: flex; gap: 24px; }
.qr-item { text-align: center; }
.qr-item img { width: 120px; height: 120px; border-radius: 10px; margin-bottom: 8px; }
.qr-item p { font-size: 12px; color: var(--brand-gray); }
.community-entries { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.entry-btn {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08);
  color: #fff; font-size: 14px; font-weight: 600;
  transition: all var(--transition); cursor: pointer;
}
.entry-btn:hover { border-color: var(--brand-orange); background: rgba(255,107,26,.08); color: #fff; }
.entry-btn-icon { font-size: 20px; }

/* === 用户评价 === */
.reviews-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.review-card {
  background: #fff; border-radius: var(--radius-md);
  padding: 24px; box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--brand-orange);
  transition: box-shadow var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-md); }
.review-stars { color: #FFB347; font-size: 16px; margin-bottom: 12px; }
.review-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
.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-accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; color: #fff; font-weight: 700; flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 700; color: var(--text-main); }
.review-date { font-size: 12px; color: var(--text-muted); }
.review-tag {
  font-size: 11px; padding: 2px 8px; border-radius: 10px;
  background: rgba(255,107,26,.1); color: var(--brand-orange);
  margin-left: auto;
}

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--brand-light);
  overflow: hidden;
}
.faq-question {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 0; cursor: pointer;
  font-size: 16px; font-weight: 600; color: var(--text-main);
  transition: color var(--transition);
}
.faq-question:hover { color: var(--brand-orange); }
.faq-arrow {
  font-size: 18px; color: var(--brand-orange);
  transition: transform var(--transition); flex-shrink: 0;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-item.open .faq-answer { max-height: 300px; }
.faq-answer p {
  padding-bottom: 20px; font-size: 14px; color: var(--text-muted); line-height: 1.7;
}

/* === 社交分享 === */
.share-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 20px 0; border-top: 1px solid var(--brand-light);
}
.share-label { font-size: 14px; color: var(--text-muted); font-weight: 600; }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: 20px; font-size: 13px; font-weight: 600;
  cursor: pointer; border: none; transition: all var(--transition);
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo  { background: #E6162D; color: #fff; }
.share-douyin { background: #000; color: #fff; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: .85; transform: translateY(-2px); }

/* === 页脚 === */
.site-footer {
  background: var(--brand-dark); color: var(--brand-gray);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.06);
}
.footer-brand-name { font-size: 20px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.footer-brand-name span { color: var(--brand-orange); }
.footer-desc { font-size: 13px; line-height: 1.7; margin-bottom: 20px; }
.footer-logo { width: 48px; height: 48px; border-radius: 10px; margin-bottom: 12px; }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 13px; color: var(--brand-gray); transition: color var(--transition); }
.footer-links a:hover { color: var(--brand-orange); }
.footer-qr { display: flex; gap: 20px; margin-top: 16px; }
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 80px; height: 80px; border-radius: 8px; }
.footer-qr-item p { font-size: 11px; margin-top: 6px; }
.footer-bottom {
  padding: 20px 0; display: flex; justify-content: space-between;
  align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 12px;
}
.footer-bottom a { color: var(--brand-gray); }
.footer-bottom a:hover { color: var(--brand-orange); }
.update-time { color: var(--brand-orange); font-weight: 600; }

/* === 面包屑 === */
.breadcrumb {
  padding: 14px 0; font-size: 13px; color: var(--text-muted);
  border-bottom: 1px solid var(--brand-light);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--brand-orange); }
.breadcrumb span { margin: 0 8px; }

/* === 标签云 === */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-item {
  padding: 6px 16px; border-radius: 20px; font-size: 13px;
  background: var(--brand-light); color: var(--text-muted);
  border: 1px solid rgba(0,0,0,.06);
  transition: all var(--transition); cursor: pointer;
}
.tag-item:hover { background: var(--brand-orange); color: #fff; border-color: var(--brand-orange); }

/* === 统计数字 === */
.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.stat-card {
  text-align: center; padding: 32px 20px;
  background: var(--brand-navy); border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,.06);
}
.stat-num { font-size: 36px; font-weight: 900; color: var(--brand-orange); }
.stat-unit { font-size: 18px; }
.stat-label { font-size: 13px; color: var(--brand-gray); margin-top: 6px; }

/* === 移动端响应式 === */
@media (max-width: 1024px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .experts-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .entertain-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .howto-step::after { display: none; }
}

@media (max-width: 768px) {
  .nav-menu, .nav-actions .btn { display: none; }
  .nav-toggle { display: block; }
  .nav-menu.open {
    display: flex; flex-direction: column;
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--brand-dark); padding: 16px;
    border-top: 1px solid rgba(255,255,255,.08);
    z-index: 999;
  }
  .hero { min-height: 420px; }
  .hero-stats { gap: 20px; }
  .hero-stat-num { font-size: 22px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .search-hot { display: none; }
  .top-bar-inner { justify-content: center; }
  .top-bar-inner .top-bar-right { display: none; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .entertain-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .contact-qr { justify-content: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* === 懒加载占位 === */
img[data-src] {
  background: linear-gradient(90deg, #e8edf3 25%, #d0d8e4 50%, #e8edf3 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* === 滚动动画 === */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: none; }