/* ========================================
   国产 - 官方网站样式
   域名: cdr0v3.cn
   主题: 深钢铁灰 + 烈焰橙 + 碳纤维黑
======================================== */

:root {
  --primary: #ff6a00;
  --primary-dark: #cc5200;
  --primary-light: #ff8c3a;
  --steel: #1a1e2e;
  --steel-mid: #252a3d;
  --steel-light: #2f3550;
  --carbon: #0d0f1a;
  --chrome: #c8cdd8;
  --chrome-light: #e8ecf4;
  --white: #ffffff;
  --text-main: #e0e4f0;
  --text-muted: #8a90a8;
  --text-dark: #1a1e2e;
  --border: rgba(255,106,0,0.18);
  --border-steel: rgba(200,205,216,0.12);
  --shadow: 0 4px 24px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 24px rgba(255,106,0,0.22);
  --radius: 10px;
  --radius-lg: 18px;
  --transition: 0.28s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

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

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- SCROLLBAR ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--steel); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ---- CONTAINER ---- */
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1440px; margin: 0 auto; padding: 0 24px; }

/* ==============================
   HEADER / NAV
============================== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,15,26,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 2px 32px rgba(255,106,0,0.15); }

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 24px;
}

.logo-wrap { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-wrap img { width: 48px; height: 48px; object-fit: contain; }
.logo-text { font-size: 1.5rem; font-weight: 900; color: var(--white); letter-spacing: -0.5px; }
.logo-text span { color: var(--primary); }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--chrome); font-size: 0.92rem; font-weight: 600;
  padding: 8px 14px; border-radius: 6px;
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary); background: rgba(255,106,0,0.1);
}

.header-actions { display: flex; align-items: center; gap: 10px; }
.btn-nav {
  background: var(--primary); color: var(--white);
  padding: 8px 18px; border-radius: 6px;
  font-size: 0.88rem; font-weight: 700;
  transition: all var(--transition); white-space: nowrap;
}
.btn-nav:hover { background: var(--primary-dark); color: var(--white); transform: translateY(-1px); }

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 6px; border: none; background: none;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--chrome); border-radius: 2px;
  transition: all var(--transition);
}

/* ---- SEARCH BAR ---- */
.search-bar-wrap {
  background: var(--steel-mid);
  border-bottom: 1px solid var(--border-steel);
  padding: 10px 0;
}
.search-form {
  display: flex; align-items: center; gap: 0;
  max-width: 680px; margin: 0 auto;
  background: var(--steel-light);
  border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
}
.search-form input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text-main); padding: 10px 16px;
  font-size: 0.95rem;
}
.search-form input::placeholder { color: var(--text-muted); }
.search-form button {
  background: var(--primary); border: none; cursor: pointer;
  color: var(--white); padding: 10px 20px;
  font-size: 0.9rem; font-weight: 600;
  transition: background var(--transition);
}
.search-form button:hover { background: var(--primary-dark); }

/* ==============================
   HERO BANNER
============================== */
.hero-banner {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden; padding-top: 110px;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  background-attachment: fixed;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(13,15,26,0.88) 0%, rgba(13,15,26,0.55) 50%, rgba(255,106,0,0.12) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,106,0,0.15); border: 1px solid var(--primary);
  color: var(--primary); padding: 6px 16px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; margin-bottom: 20px;
}
.hero-badge::before { content: ''; width: 8px; height: 8px; background: var(--primary); border-radius: 50%; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(1.3)} }

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900; line-height: 1.1;
  color: var(--white); margin-bottom: 16px;
}
.hero-title .brand { color: var(--primary); }
.hero-title .sub { display: block; font-size: 0.55em; color: var(--chrome); font-weight: 600; margin-top: 8px; }

.hero-desc {
  font-size: 1.08rem; color: var(--chrome);
  max-width: 560px; margin-bottom: 32px; line-height: 1.8;
}

.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }
.btn-primary {
  background: var(--primary); color: var(--white);
  padding: 14px 32px; border-radius: 8px;
  font-size: 1rem; font-weight: 700;
  transition: all var(--transition); border: 2px solid var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: var(--white); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.btn-outline {
  background: transparent; color: var(--white);
  padding: 14px 32px; border-radius: 8px;
  font-size: 1rem; font-weight: 700;
  border: 2px solid rgba(255,255,255,0.3);
  transition: all var(--transition);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

.hero-stats {
  display: flex; gap: 32px; flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num { font-size: 2rem; font-weight: 900; color: var(--primary); line-height: 1; }
.stat-label { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }

/* ==============================
   SECTIONS
============================== */
.section { padding: 80px 0; }
.section-alt { background: var(--steel); }
.section-dark { background: var(--steel-mid); }

.section-head { text-align: center; margin-bottom: 52px; }
.section-tag {
  display: inline-block; background: rgba(255,106,0,0.12);
  color: var(--primary); padding: 4px 14px; border-radius: 20px;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; margin-bottom: 14px;
  border: 1px solid rgba(255,106,0,0.3);
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900; color: var(--white); margin-bottom: 14px;
}
.section-title .accent { color: var(--primary); }
.section-subtitle { font-size: 1rem; color: var(--text-muted); max-width: 580px; margin: 0 auto; }

/* ==============================
   VIDEO CARDS
============================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--steel-mid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-steel);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-glow); border-color: var(--border); }

.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }

.play-btn {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.play-btn .play-icon {
  width: 56px; height: 56px;
  background: rgba(255,106,0,0);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transform: scale(0.7); opacity: 0;
  transition: all var(--transition);
}
.play-btn .play-icon::after {
  content: '';
  border-style: solid;
  border-width: 12px 0 12px 22px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-card:hover .play-btn { background: rgba(0,0,0,0.45); }
.video-card:hover .play-icon { background: var(--primary); transform: scale(1); opacity: 1; box-shadow: var(--shadow-glow); }

.video-duration {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.75); color: #fff;
  padding: 2px 8px; border-radius: 4px; font-size: 0.78rem;
}
.video-quality {
  position: absolute; top: 10px; left: 10px;
  background: var(--primary); color: #fff;
  padding: 2px 8px; border-radius: 4px; font-size: 0.72rem; font-weight: 700;
}

.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem; font-weight: 700; color: var(--white);
  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; }

/* ==============================
   FEATURE CARDS
============================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 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(--primary), var(--primary-light));
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--border); }

.feature-icon {
  width: 56px; height: 56px;
  background: rgba(255,106,0,0.12);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 20px;
  border: 1px solid rgba(255,106,0,0.2);
}
.feature-title { font-size: 1.05rem; font-weight: 800; color: var(--white); margin-bottom: 10px; }
.feature-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* ==============================
   EXPERT CARDS
============================== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.expert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-glow); }
.expert-photo { position: relative; aspect-ratio: 3/4; overflow: hidden; }
.expert-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.expert-card:hover .expert-photo img { transform: scale(1.04); }
.expert-badge {
  position: absolute; bottom: 12px; left: 12px;
  background: var(--primary); color: #fff;
  padding: 4px 12px; border-radius: 20px;
  font-size: 0.75rem; font-weight: 700;
}
.expert-info { padding: 20px; }
.expert-name { font-size: 1.1rem; font-weight: 800; color: var(--white); margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--primary); font-weight: 600; margin-bottom: 10px; }
.expert-cert { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 14px; }
.expert-actions { display: flex; gap: 8px; }
.btn-sm {
  padding: 6px 14px; border-radius: 6px;
  font-size: 0.78rem; font-weight: 700;
  transition: all var(--transition);
}
.btn-sm-primary { background: var(--primary); color: #fff; }
.btn-sm-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-sm-outline { border: 1px solid var(--border); color: var(--chrome); }
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ==============================
   STATS BAR
============================== */
.stats-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 48px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px; text-align: center;
}
.stats-grid .num { font-size: 2.6rem; font-weight: 900; color: #fff; line-height: 1; }
.stats-grid .lbl { font-size: 0.85rem; color: rgba(255,255,255,0.8); margin-top: 6px; }

/* ==============================
   FAQ
============================== */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: var(--primary); }
.faq-q {
  padding: 18px 24px;
  font-size: 0.98rem; font-weight: 700; color: var(--white);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  user-select: none;
}
.faq-q .arrow { color: var(--primary); font-size: 1.1rem; transition: transform var(--transition); }
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease, padding 0.2s;
  font-size: 0.9rem; color: var(--text-muted); line-height: 1.8;
}
.faq-a-inner { padding: 0 24px 18px; }
.faq-item.open .faq-a { max-height: 300px; }

/* ==============================
   REVIEWS
============================== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
}
.review-card:hover { border-color: var(--border); transform: translateY(-3px); }
.review-stars { color: var(--primary); font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 0.9rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; font-size: 0.9rem; flex-shrink: 0;
}
.review-name { font-size: 0.88rem; font-weight: 700; color: var(--white); }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ==============================
   PARTNER LOGOS
============================== */
.partner-grid {
  display: flex; flex-wrap: wrap; gap: 16px;
  justify-content: center; align-items: center;
}
.partner-item {
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 0.9rem; font-weight: 700; color: var(--chrome);
  transition: all var(--transition);
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ==============================
   HOW-TO STEPS
============================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.step-card {
  text-align: center; padding: 32px 20px;
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}
.step-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.step-num {
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--primary); color: #fff;
  font-size: 1.3rem; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.step-title { font-size: 0.95rem; font-weight: 800; color: var(--white); margin-bottom: 8px; }
.step-desc { font-size: 0.83rem; color: var(--text-muted); }

/* ==============================
   CONTACT / INFO
============================== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.info-block {
  background: var(--steel-mid);
  border: 1px solid var(--border-steel);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.info-block h3 { font-size: 1.1rem; font-weight: 800; color: var(--white); margin-bottom: 20px; padding-bottom: 12px; border-bottom: 1px solid var(--border-steel); }
.info-row { display: flex; gap: 12px; margin-bottom: 14px; align-items: flex-start; }
.info-icon { color: var(--primary); font-size: 1rem; flex-shrink: 0; margin-top: 2px; }
.info-label { font-size: 0.78rem; color: var(--text-muted); }
.info-val { font-size: 0.9rem; color: var(--white); font-weight: 600; }

.qr-row { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-box {
  width: 100px; height: 100px;
  background: var(--steel-light);
  border: 2px solid var(--border);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; margin-bottom: 8px;
}
.qr-label { font-size: 0.75rem; color: var(--text-muted); }

/* ==============================
   TIKTOK STYLE CARDS
============================== */
.tiktok-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.tiktok-card {
  background: var(--steel-mid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-steel);
  transition: all var(--transition);
  cursor: pointer;
}
.tiktok-card:hover { transform: translateY(-5px) scale(1.02); box-shadow: var(--shadow-glow); }
.tiktok-thumb {
  position: relative; aspect-ratio: 9/16; overflow: hidden;
}
.tiktok-thumb img { width: 100%; height: 100%; object-fit: cover; }
.tiktok-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 12px;
}
.tiktok-play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,106,0,0); display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: all var(--transition);
}
.tiktok-play::after {
  content: ''; border-style: solid;
  border-width: 9px 0 9px 16px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}
.tiktok-card:hover .tiktok-play { background: var(--primary); opacity: 1; }
.tiktok-title { font-size: 0.78rem; color: #fff; font-weight: 600; line-height: 1.4; }
.tiktok-views { font-size: 0.72rem; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* ==============================
   AI SECTION
============================== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, var(--steel-mid) 0%, var(--steel-light) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative; overflow: hidden;
  transition: all var(--transition);
}
.ai-card::after {
  content: ''; position: absolute;
  top: -40px; right: -40px;
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(255,106,0,0.12) 0%, transparent 70%);
}
.ai-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.ai-icon { font-size: 2rem; margin-bottom: 16px; }
.ai-title { font-size: 1rem; font-weight: 800; color: var(--white); margin-bottom: 10px; }
.ai-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }

/* ==============================
   BREADCRUMB
============================== */
.breadcrumb {
  background: var(--steel-mid);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-steel);
  margin-top: 68px;
}
.breadcrumb-list { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.breadcrumb-list li { font-size: 0.82rem; color: var(--text-muted); }
.breadcrumb-list li a { color: var(--text-muted); }
.breadcrumb-list li a:hover { color: var(--primary); }
.breadcrumb-list li.active { color: var(--primary); }
.breadcrumb-list li + li::before { content: '/'; margin-right: 8px; }

/* ==============================
   PAGE HERO (inner pages)
============================== */
.page-hero {
  background: linear-gradient(135deg, var(--steel) 0%, var(--steel-mid) 100%);
  padding: 60px 0 48px;
  margin-top: 68px;
  border-bottom: 1px solid var(--border-steel);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900; color: var(--white); margin-bottom: 12px; }
.page-hero p { font-size: 1rem; color: var(--text-muted); max-width: 600px; }

/* ==============================
   FOOTER
============================== */
.site-footer {
  background: var(--carbon);
  border-top: 1px solid var(--border-steel);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 48px;
}
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--steel-mid); border: 1px solid var(--border-steel);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; color: var(--chrome);
  transition: all var(--transition);
}
.social-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

.footer-col h4 { font-size: 0.9rem; font-weight: 800; color: var(--white); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.83rem; color: var(--text-muted); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--primary); }

.footer-bottom {
  border-top: 1px solid var(--border-steel);
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 0.8rem; color: var(--text-muted); }
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
.update-time { font-size: 0.78rem; color: var(--text-muted); }

/* ==============================
   SHARE BUTTONS
============================== */
.share-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 32px; }
.share-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 6px;
  font-size: 0.82rem; font-weight: 700;
  transition: all var(--transition); cursor: pointer;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bili { background: #00a1d6; color: #fff; }
.share-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.3); }

/* ==============================
   MOBILE NAV OVERLAY
============================== */
.mobile-nav {
  display: none; position: fixed; inset: 0; z-index: 999;
  background: rgba(13,15,26,0.98);
  flex-direction: column; align-items: center; justify-content: center;
  gap: 20px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a { font-size: 1.3rem; font-weight: 700; color: var(--white); }
.mobile-nav a:hover { color: var(--primary); }
.mobile-close { position: absolute; top: 24px; right: 24px; font-size: 1.8rem; color: var(--chrome); cursor: pointer; background: none; border: none; }

/* ==============================
   NOISE / INTERFERENCE TAGS
============================== */
.nt-wrap { position: absolute; width: 0; height: 0; overflow: hidden; pointer-events: none; }

/* ==============================
   UTILITY
============================== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-32 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-16 { gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }

/* ==============================
   RESPONSIVE
============================== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav, .header-actions .btn-nav { display: none; }
  .hamburger { display: flex; }
  .hero-banner { min-height: 90vh; padding-top: 90px; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .tiktok-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; text-align: center; }
  .tiktok-grid { grid-template-columns: repeat(2,1fr); }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
}