/* ============================================
   草莓视频 - 原创样式表
   品牌：草莓视频 | ybup.cn
   配色：火影橙 + 深夜蓝 + 忍者红
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #FF6B35;
  --primary-dark: #E55A2B;
  --secondary: #1A1A2E;
  --accent: #E94560;
  --bg-light: #F5F5F0;
  --bg-white: #FFFFFF;
  --bg-dark: #16213E;
  --text-main: #2D2D2D;
  --text-light: #6B7280;
  --text-white: #F9FAFB;
  --border: #E5E7EB;
  --shadow: 0 4px 16px rgba(26,26,46,0.10);
  --shadow-hover: 0 8px 32px rgba(26,26,46,0.18);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei','WenQuanYi Micro Hei',sans-serif;
  --max-width: 1200px;
}

/* === 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);
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
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(--secondary); }

/* === Container === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* === Header === */
.site-header {
  background: var(--secondary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 68px;
}
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-img { height: 42px; width: auto; }
.logo-text { color: var(--primary); font-size: 1.4rem; font-weight: 800; letter-spacing: 1px; }

/* === Navigation === */
.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav a {
  color: var(--text-white);
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(255,107,53,0.1);
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}
.main-nav a:hover::after,
.main-nav a.active::after { width: 60%; }

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* === Search Bar === */
.search-bar {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--bg-dark) 100%);
  padding: 16px 0;
  border-bottom: 2px solid rgba(255,107,53,0.2);
}
.search-bar .container { display: flex; justify-content: center; }
.search-wrapper {
  display: flex;
  max-width: 600px;
  width: 100%;
  background: rgba(255,255,255,0.1);
  border-radius: 50px;
  overflow: hidden;
  border: 1px solid rgba(255,107,53,0.3);
  transition: var(--transition);
}
.search-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(255,107,53,0.2);
}
.search-wrapper input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 12px 24px;
  color: var(--text-white);
  font-size: 0.95rem;
  outline: none;
}
.search-wrapper input::placeholder { color: rgba(255,255,255,0.5); }
.search-wrapper button {
  background: var(--primary);
  border: none;
  color: white;
  padding: 12px 28px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}
.search-wrapper button:hover { background: var(--primary-dark); }

/* === Breadcrumb === */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.85rem;
  color: var(--text-light);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* === Hero Section === */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(26,26,46,0.7) 0%, rgba(26,26,46,0.5) 50%, rgba(26,26,46,0.8) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 20px;
  max-width: 800px;
}
.hero h1 {
  color: var(--text-white);
  font-size: 2.8rem;
  margin-bottom: 16px;
  text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
}
.hero h1 .brand-highlight { color: var(--primary); }
.hero p {
  color: rgba(255,255,255,0.9);
  font-size: 1.15rem;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.hero-tag {
  background: rgba(255,107,53,0.2);
  color: var(--primary);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  border: 1px solid rgba(255,107,53,0.3);
  backdrop-filter: blur(4px);
}

/* === Section Common === */
.section {
  padding: 64px 0;
}
.section-dark {
  background: var(--secondary);
  color: var(--text-white);
}
.section-dark h2,
.section-dark h3 { color: var(--text-white); }
.section-alt { background: var(--bg-white); }
.section-title {
  text-align: center;
  margin-bottom: 48px;
}
.section-title h2 {
  font-size: 2rem;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  margin: 12px auto 0;
  border-radius: 2px;
}
.section-title p {
  color: var(--text-light);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}
.section-dark .section-title p { color: rgba(255,255,255,0.7); }

/* === Card Grid === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

/* === Video Card === */
.video-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.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: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(255,107,53,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  z-index: 3;
}
.play-btn::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent white;
  margin-left: 4px;
}
.video-card:hover .play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: white;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  z-index: 2;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.video-tag {
  background: rgba(255,107,53,0.1);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
}

/* === Feature Card === */
.feature-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid transparent;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.8rem;
  color: white;
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }

/* === Expert Card === */
.expert-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 24px auto 16px;
  border: 3px solid var(--primary);
}
.expert-card h3 { font-size: 1.1rem; margin-bottom: 4px; }
.expert-card .title { color: var(--primary); font-size: 0.85rem; margin-bottom: 12px; }
.expert-card p { font-size: 0.85rem; color: var(--text-light); padding: 0 20px 20px; line-height: 1.6; }
.expert-btns { display: flex; gap: 10px; justify-content: center; padding-bottom: 24px; }
.btn-sm {
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); color: white; }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; }

/* === Partner Logos === */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  align-items: center;
}
.partner-logo {
  background: var(--bg-white);
  padding: 20px 32px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--secondary);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.partner-logo:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 1px solid var(--border);
}
.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  font-size: 0.95rem;
}
.faq-question:hover { color: var(--primary); }
.faq-arrow {
  transition: var(--transition);
  font-size: 1.2rem;
  color: var(--primary);
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 18px;
}

/* === Reviews === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-stars { color: #F59E0B; font-size: 0.9rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 0.9rem; color: var(--text-main); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
}
.review-name { font-weight: 600; font-size: 0.85rem; }
.review-date { font-size: 0.75rem; color: var(--text-light); }

/* === Contact Info === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}
.contact-item {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}
.contact-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  color: white;
  font-size: 1.3rem;
}
.contact-item h4 { font-size: 1rem; margin-bottom: 6px; }
.contact-item p { font-size: 0.85rem; color: var(--text-light); }

/* === How To Guide === */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  position: relative;
  counter-increment: step;
}
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -12px;
  left: 24px;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}
.howto-step h4 { margin-bottom: 8px; font-size: 1rem; }
.howto-step p { font-size: 0.85rem; color: var(--text-light); line-height: 1.6; }

/* === Share Buttons === */
.share-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  color: white;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: white; }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; }
.share-bilibili { background: #00A1D6; }

/* === Footer === */
.site-footer {
  background: var(--secondary);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-img { height: 36px; margin-bottom: 12px; }
.footer-brand p { font-size: 0.85rem; line-height: 1.7; }
.footer-col h4 {
  color: var(--text-white);
  font-size: 1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--primary); padding-left: 4px; }
.footer-qr { display: flex; gap: 16px; margin-top: 12px; }
.footer-qr img { width: 100px; height: 100px; border-radius: var(--radius-sm); }
.footer-qr-label { font-size: 0.75rem; text-align: center; margin-top: 4px; }
.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  text-align: center;
}
.btn-lg { padding: 14px 36px; font-size: 1.05rem; }
.btn-primary-lg { background: var(--primary); color: white; }
.btn-primary-lg:hover { background: var(--primary-dark); color: white; transform: translateY(-2px); }

/* === Image Gallery === */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.gallery-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  cursor: pointer;
}
.gallery-item img { transition: var(--transition); width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.gallery-item:hover img { transform: scale(1.05); }

/* === Page Header === */
.page-header {
  background: var(--secondary);
  padding: 48px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,107,53,0.1) 0%, transparent 60%);
}
.page-header h1 {
  color: var(--text-white);
  font-size: 2.2rem;
  position: relative;
  z-index: 1;
}
.page-header p {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
  margin-top: 8px;
  position: relative;
  z-index: 1;
}

/* === Content Article === */
.article-content {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  margin: 32px 0;
  line-height: 1.8;
}
.article-content h2 { font-size: 1.6rem; margin: 32px 0 16px; color: var(--secondary); }
.article-content h3 { font-size: 1.3rem; margin: 24px 0 12px; color: var(--secondary); }
.article-content p { margin-bottom: 16px; color: var(--text-main); }
.article-content img {
  border-radius: var(--radius-sm);
  margin: 20px 0;
  box-shadow: var(--shadow);
}

/* === Sidebar Recommend === */
.sidebar-recommend {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.sidebar-recommend h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
}
.recommend-item {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.recommend-item:last-child { border-bottom: none; }
.recommend-item:hover { padding-left: 4px; }
.recommend-item img {
  width: 80px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.recommend-item h4 {
  font-size: 0.85rem;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.recommend-item span { font-size: 0.75rem; color: var(--text-light); }

/* === Two Column Layout === */
.two-col {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
}

/* === Lazy Load === */
.lazy-img {
  opacity: 0;
  transition: opacity 0.5s ease;
}
.lazy-img.loaded { opacity: 1; }

/* === MCP Frontend Placeholder === */
.mcp-widget {
  background: linear-gradient(135deg, var(--bg-dark), var(--secondary));
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  border: 1px dashed rgba(255,107,53,0.3);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .two-col { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--secondary);
    flex-direction: column;
    padding: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  }
  .main-nav.active { display: flex; }
  .main-nav a { padding: 12px 16px; width: 100%; }
  .hero h1 { font-size: 1.8rem; }
  .hero { min-height: 360px; }
  .section { padding: 40px 0; }
  .section-title h2 { font-size: 1.5rem; }
  .card-grid,
  .card-grid-3,
  .card-grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .article-content { padding: 24px 16px; }
  .howto-steps { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .header-inner { padding: 0 16px; }
}

@media (max-width: 480px) {
  html { font-size: 14px; }
  .hero h1 { font-size: 1.5rem; }
  .hero-content { padding: 40px 16px; }
  .container { padding: 0 12px; }
}

/* === Animations === */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-light); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-dark); }