/* ============================================
   丝袜美腿 - 原创样式表
   品牌：丝袜美腿 | miyuantianya.cn
   配色：星空蓝 + 活力橙红 + 科技青绿
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #1A1F36;
  --secondary: #FF6B35;
  --accent: #00D4AA;
  --bg-dark: #0D1117;
  --bg-card: #161B2E;
  --text-main: #E8ECF1;
  --text-sub: #8B95A5;
  --text-dark: #1A1F36;
  --gradient-main: linear-gradient(135deg, #1A1F36 0%, #0D1117 100%);
  --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FF8F65 100%);
  --gradient-teal: linear-gradient(135deg, #00D4AA 0%, #00B894 100%);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
  --shadow-hover: 0 12px 48px rgba(255,107,53,0.2);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1280px;
  --font-main: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--secondary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text-main); }

/* === Container === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-title {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 16px;
  position: relative;
}
.section-title span { color: var(--secondary); }
.section-subtitle {
  text-align: center;
  color: var(--text-sub);
  font-size: 1.05rem;
  margin-bottom: 48px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

/* === Header / Navigation === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: var(--transition);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
}
.site-logo img { height: 38px; width: auto; border-radius: 6px; }
.site-logo .brand-text { color: var(--secondary); }

/* Nav */
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: var(--text-sub);
  font-size: 0.92rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-main);
  background: rgba(255,107,53,0.12);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* Search Bar */
.search-bar {
  background: rgba(22, 27, 46, 0.9);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  padding: 12px 0;
  margin-top: 68px;
}
.search-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-input-wrap {
  flex: 1;
  position: relative;
  max-width: 600px;
}
.search-input-wrap input {
  width: 100%;
  padding: 10px 44px 10px 16px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 24px;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}
.search-input-wrap input:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.1);
}
.search-input-wrap input::placeholder { color: var(--text-sub); }
.search-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--gradient-accent);
  border: none;
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}
.search-btn:hover { transform: translateY(-50%) scale(1.08); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tags a {
  font-size: 0.82rem;
  color: var(--text-sub);
  padding: 4px 12px;
  background: rgba(255,255,255,0.04);
  border-radius: 16px;
  transition: var(--transition);
}
.search-tags a:hover { background: rgba(255,107,53,0.15); color: var(--secondary); }

/* === Hero Section === */
.hero {
  position: relative;
  min-height: 540px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-main);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13,17,23,0.95) 0%, rgba(13,17,23,0.5) 60%, rgba(13,17,23,0.3) 100%);
  z-index: 2;
}
.hero-content {
  position: relative;
  z-index: 3;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 120px 20px 80px;
}
.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 16px;
  line-height: 1.2;
}
.hero h1 .highlight { color: var(--secondary); }
.hero .hero-desc {
  font-size: 1.15rem;
  color: var(--text-sub);
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255,107,53,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,53,0.5); color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: var(--bg-dark); }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.hero-stat-item .stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--secondary);
}
.hero-stat-item .stat-label {
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-top: 4px;
}

/* === Video Cards Grid === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 56px;
  height: 56px;
  background: rgba(255,107,53,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  opacity: 0;
}
.video-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}
.video-card:hover .video-play-btn {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 0.98rem;
  font-weight: 600;
  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: 0.82rem;
  color: var(--text-sub);
}
.video-meta .views::before { content: '\25B6 '; font-size: 0.7rem; }
.video-meta .likes::before { content: '\2764 '; }
.video-tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent);
  background: rgba(0,212,170,0.1);
  padding: 2px 10px;
  border-radius: 12px;
  margin-top: 8px;
}

/* === Category Modules === */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.category-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.04);
}
.category-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,107,53,0.3);
  box-shadow: var(--shadow-hover);
}
.category-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--gradient-accent);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.category-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.category-card p { font-size: 0.9rem; color: var(--text-sub); }

/* === Expert Section === */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.04);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--secondary);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-card h3 { font-size: 1.1rem; margin-bottom: 4px; }
.expert-card .expert-title { color: var(--accent); font-size: 0.88rem; margin-bottom: 12px; }
.expert-card p { font-size: 0.88rem; color: var(--text-sub); margin-bottom: 16px; }
.expert-btns { display: flex; gap: 10px; justify-content: center; }
.expert-btns .btn { padding: 8px 18px; font-size: 0.85rem; }

/* === Reviews / Testimonials === */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.04);
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(0,212,170,0.3); }
.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
}
.review-name { font-weight: 600; font-size: 0.95rem; }
.review-date { font-size: 0.8rem; color: var(--text-sub); }
.review-stars { color: #FFB800; font-size: 0.9rem; letter-spacing: 2px; margin-bottom: 12px; }
.review-text { font-size: 0.92rem; color: var(--text-sub); line-height: 1.7; }

/* === FAQ Section === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.04);
}
.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--secondary); }
.faq-question .faq-icon {
  font-size: 1.4rem;
  color: var(--accent);
  transition: var(--transition);
  flex-shrink: 0;
  margin-left: 12px;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.8;
}

/* === Partners / Brands === */
.partner-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 40px 0;
}
.partner-logo {
  width: 120px;
  height: 60px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--text-sub);
  transition: var(--transition);
}
.partner-logo:hover { background: rgba(255,107,53,0.12); color: var(--secondary); }

/* === Contact Section === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.contact-info-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid rgba(255,255,255,0.04);
}
.contact-info-card h3 { font-size: 1.2rem; margin-bottom: 20px; color: var(--secondary); }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
  font-size: 0.92rem;
  color: var(--text-sub);
}
.contact-item .ci-icon {
  width: 36px;
  height: 36px;
  background: rgba(255,107,53,0.12);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary);
  flex-shrink: 0;
  font-size: 1rem;
}
.qr-codes {
  display: flex;
  gap: 24px;
  margin-top: 20px;
}
.qr-item { text-align: center; }
.qr-item img { width: 140px; height: 140px; border-radius: var(--radius-sm); margin-bottom: 8px; }
.qr-item p { font-size: 0.82rem; color: var(--text-sub); }

/* === Social Share === */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 0;
}
.share-bar span { font-size: 0.9rem; color: var(--text-sub); }
.share-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #fff;
  transition: var(--transition);
  cursor: pointer;
}
.share-btn:hover { transform: scale(1.15); }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

/* === Footer === */
.site-footer {
  background: var(--primary);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand p { font-size: 0.88rem; color: var(--text-sub); line-height: 1.7; max-width: 320px; }
.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-main);
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--secondary);
}
.footer-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--text-sub);
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--secondary); padding-left: 6px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.84rem;
  color: var(--text-sub);
}

/* === Breadcrumb === */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.88rem;
  color: var(--text-sub);
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb span { margin: 0 8px; }

/* === Inner Page Hero === */
.page-hero {
  background: var(--gradient-main);
  padding: 120px 0 60px;
  text-align: center;
}
.page-hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.page-hero p { color: var(--text-sub); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* === How-To Guide === */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  counter-increment: step;
}
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}
.howto-step h4 { margin-top: 8px; margin-bottom: 10px; font-size: 1rem; }
.howto-step p { font-size: 0.88rem; color: var(--text-sub); }

/* === Utility === */
.text-accent { color: var(--accent); }
.text-secondary { color: var(--secondary); }
.bg-alt { background: rgba(22, 27, 46, 0.5); }
.mb-0 { margin-bottom: 0; }
.mt-40 { margin-top: 40px; }
.text-center { text-align: center; }
.lazy-load { opacity: 0; transition: opacity 0.6s ease; }
.lazy-load.loaded { opacity: 1; }

/* === Animations === */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

/* === Responsive === */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(13,17,23,0.98);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .main-nav.active { display: flex; }
  .nav-toggle { display: flex; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .search-tags { display: none; }
  .howto-steps { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .qr-codes { flex-direction: column; align-items: center; }
  .partner-logos { gap: 20px; }
}