/*
 * 抖音揭秘 - 汽车改装视频社区官方网站主样式
 * 设计风格：赛车运动风 · 深邃专业感
 * 主色：#1a2332（深夜蓝）| 辅助色：#d32f2f（赛车红）| 点缀：#ffc107（金色）
 * 文字：#e8eaf0（冷白）| 背景：#0f1520（极深蓝黑）
 * 版本：v1.0 | 更新：2025
 */

/* ===== CSS Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  background: #0f1520;
  color: #e8eaf0;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #ffc107; text-decoration: none; transition: color 0.3s; }
a:hover { color: #d32f2f; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* ===== CSS Variables ===== */
:root {
  --primary: #1a2332;
  --primary-light: #243044;
  --accent: #d32f2f;
  --accent-hover: #b71c1c;
  --gold: #ffc107;
  --gold-dark: #e6a800;
  --bg-dark: #0f1520;
  --bg-card: #1a2332;
  --bg-card-hover: #1e2a3d;
  --text-main: #e8eaf0;
  --text-muted: #8899aa;
  --text-light: #b0bec5;
  --border: rgba(255,193,7,0.15);
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-hover: 0 8px 40px rgba(211,47,47,0.25);
  --radius: 8px;
  --radius-lg: 16px;
  --transition: all 0.3s ease;
}

/* ===== Utility Classes ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: #131c2a; }
.text-center { text-align: center; }
.text-gold { color: var(--gold); }
.text-red { color: var(--accent); }
.hidden { display: none !important; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ===== Section Titles ===== */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  position: relative;
}
.section-title span { color: var(--gold); }
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  margin-top: 10px;
  border-radius: 2px;
}
.text-center .section-title::after { margin: 10px auto 0; }
.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 40px;
  max-width: 600px;
}
.text-center .section-subtitle { margin-left: auto; margin-right: auto; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  letter-spacing: 0.5px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #c62828);
  color: #fff;
  box-shadow: 0 4px 15px rgba(211,47,47,0.3);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #c62828, var(--accent));
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(211,47,47,0.45);
}
.btn-gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: #1a2332;
  box-shadow: 0 4px 15px rgba(255,193,7,0.3);
}
.btn-gold:hover {
  transform: translateY(-2px);
  color: #1a2332;
  box-shadow: 0 6px 20px rgba(255,193,7,0.45);
}
.btn-outline {
  border: 2px solid var(--gold);
  color: var(--gold);
  background: transparent;
}
.btn-outline:hover {
  background: var(--gold);
  color: #1a2332;
}
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ===== Header & Navigation ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 21, 32, 0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img {
  height: 44px;
  width: auto;
}
.logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 1px;
}
.logo-text span { color: var(--gold); }
.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--gold);
  background: rgba(255,193,7,0.08);
}
.header-actions { display: flex; align-items: center; gap: 12px; }
.hamburger-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  cursor: pointer;
}
.hamburger-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  transition: var(--transition);
  border-radius: 2px;
}

/* ===== Search Bar ===== */
.search-bar-wrap {
  background: rgba(26, 35, 50, 0.9);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 700px;
  margin: 0 auto;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,193,7,0.2);
  border-radius: 30px;
  overflow: hidden;
  transition: var(--transition);
}
.search-bar-inner:focus-within {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(255,193,7,0.1);
}
.search-bar-inner input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 20px;
  color: var(--text-main);
  font-size: 0.95rem;
}
.search-bar-inner input::placeholder { color: var(--text-muted); }
.search-bar-inner button {
  background: linear-gradient(135deg, var(--accent), #c62828);
  color: #fff;
  border: none;
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.search-bar-inner button:hover { background: var(--accent-hover); }

/* ===== Hero Banner ===== */
.hero-section {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #0f1520;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,21,32,0.85) 0%, rgba(211,47,47,0.15) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(211,47,47,0.15);
  border: 1px solid rgba(211,47,47,0.4);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero-title .brand { color: var(--gold); }
.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat-item { text-align: center; }
.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--gold);
  display: block;
}
.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); }

/* ===== Notice Bar ===== */
.notice-bar {
  background: linear-gradient(90deg, var(--accent), #c62828, var(--accent));
  background-size: 200% 100%;
  animation: noticeSlide 4s linear infinite;
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.5px;
}
@keyframes noticeSlide {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ===== Video Cards ===== */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(255,193,7,0.3);
}
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: #0a0f1a;
}
.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(211,47,47,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  box-shadow: 0 4px 20px rgba(211,47,47,0.5);
  transition: transform 0.2s;
}
.video-card:hover .play-icon { transform: scale(1.1); }
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  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;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-stats {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ===== Feature Cards ===== */
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  opacity: 0;
  transition: opacity 0.3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(211,47,47,0.15), rgba(255,193,7,0.1));
  border: 1px solid rgba(255,193,7,0.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}
.feature-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }

/* ===== Expert Cards ===== */
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-photo {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.expert-info { padding: 20px; }
.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}
.expert-title {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}
.expert-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.award-tag {
  background: rgba(255,193,7,0.1);
  border: 1px solid rgba(255,193,7,0.3);
  color: var(--gold);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 12px;
}
.expert-actions { display: flex; gap: 10px; }

/* ===== Partner Logos ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  align-items: center;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.partner-item:hover { border-color: var(--gold); color: var(--gold); background: rgba(255,193,7,0.05); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(255,193,7,0.3); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  transition: var(--transition);
  gap: 12px;
}
.faq-question:hover { color: var(--gold); }
.faq-icon {
  width: 24px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--gold);
  flex-shrink: 0;
  transition: transform 0.3s;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.faq-item.open .faq-answer { display: block; }

/* ===== Reviews ===== */
.review-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 4rem;
  color: rgba(255,193,7,0.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.review-stars { color: var(--gold); font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.9rem; color: var(--text-light); 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(--accent), var(--gold));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-weight: 600; font-size: 0.9rem; color: var(--text-main); }
.review-role { font-size: 0.78rem; color: var(--text-muted); }

/* ===== How-To Steps ===== */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step-card {
  text-align: center;
  padding: 28px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
}
.step-card:hover { transform: translateY(-4px); border-color: rgba(255,193,7,0.3); }
.step-num {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--accent), #c62828);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  margin: 0 auto 16px;
}
.step-title { font-size: 1rem; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.step-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ===== Contact Section ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.contact-item:hover { border-color: rgba(255,193,7,0.3); }
.contact-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, rgba(211,47,47,0.15), rgba(255,193,7,0.1));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.92rem; color: var(--text-main); font-weight: 500; }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-item { text-align: center; }
.qr-item img {
  width: 140px;
  height: 140px;
  margin: 0 auto 10px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
}
.qr-label { font-size: 0.82rem; color: var(--text-muted); }

/* ===== Social Share ===== */
.social-share { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid transparent;
}
.share-wechat { background: rgba(7,193,96,0.1); border-color: rgba(7,193,96,0.3); color: #07c160; }
.share-wechat:hover { background: #07c160; color: #fff; }
.share-weibo { background: rgba(230,22,45,0.1); border-color: rgba(230,22,45,0.3); color: #e6162d; }
.share-weibo:hover { background: #e6162d; color: #fff; }
.share-douyin { background: rgba(0,0,0,0.2); border-color: rgba(255,255,255,0.2); color: #e8eaf0; }
.share-douyin:hover { background: #010101; color: #fff; }
.share-bilibili { background: rgba(0,161,214,0.1); border-color: rgba(0,161,214,0.3); color: #00a1d6; }
.share-bilibili:hover { background: #00a1d6; color: #fff; }

/* ===== AI Module ===== */
.ai-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ai-card {
  background: linear-gradient(135deg, rgba(26,35,50,0.9), rgba(15,21,32,0.9));
  border: 1px solid rgba(255,193,7,0.15);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.ai-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.ai-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(255,193,7,0.1); }
.ai-card:hover::after { opacity: 1; }
.ai-icon { font-size: 2.5rem; margin-bottom: 14px; }
.ai-title { font-size: 1.05rem; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.ai-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ===== Community Section ===== */
.community-tabs { display: flex; gap: 8px; margin-bottom: 28px; flex-wrap: wrap; }
.tab-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
  cursor: pointer;
}
.tab-btn.active, .tab-btn:hover {
  background: linear-gradient(135deg, var(--accent), #c62828);
  border-color: var(--accent);
  color: #fff;
}

/* ===== Footer ===== */
#site-footer {
  background: #080e18;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin: 12px 0 20px; }
.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.85rem; color: var(--text-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--gold); padding-left: 4px; }
.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: 0.82rem; color: var(--text-muted); }
.footer-copyright a { color: var(--gold); }
.footer-update { font-size: 0.78rem; color: var(--text-muted); }
.footer-icp { font-size: 0.78rem; color: var(--text-muted); }

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 14px 0;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb .sep { color: rgba(255,255,255,0.2); }
.breadcrumb .current { color: var(--gold); }

/* ===== Tags ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 12px;
  transition: var(--transition);
}
.tag:hover { border-color: var(--gold); color: var(--gold); background: rgba(255,193,7,0.05); }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: rgba(255,193,7,0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gold); }

/* ===== Lazy Load ===== */
img[data-src] { opacity: 0; transition: opacity 0.4s; }
img.loaded { opacity: 1; }

/* ===== Mobile Menu ===== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: rgba(15,21,32,0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--text-light);
  font-size: 0.95rem;
  padding: 12px 16px;
  border-radius: var(--radius);
  transition: var(--transition);
}
.mobile-nav a:hover { color: var(--gold); background: rgba(255,193,7,0.05); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .hero-title { font-size: 2rem; }
  .hero-stats { gap: 24px; }
  .site-nav { display: none; }
  .hamburger-btn { display: flex; }
  .grid-2, .grid-3, .grid-4, .video-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .ai-features { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .steps-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
}
@media (max-width: 480px) {
  .container { padding: 0 14px; }
  .hero-section { min-height: 420px; }
  .hero-title { font-size: 1.6rem; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
}

/* ===== Interference tag hiding (display:none for injected noise) ===== */
.kkt-noise { display: none !important; visibility: hidden !important; }