/* ============================================
   母狗 - 汽车改装视频社区
   原创设计 | co3zdw.cn
   ============================================ */

:root {
  --primary: #FF6B00;
  --primary-dark: #CC5500;
  --primary-light: #FF9A40;
  --accent: #00D4FF;
  --bg-dark: #0A0E1A;
  --bg-card: #111827;
  --bg-card2: #1A2235;
  --bg-section: #0D1220;
  --text-main: #F0F4FF;
  --text-muted: #8A9BB8;
  --text-dim: #5A6A85;
  --border: #1E2D45;
  --border-light: #2A3D5A;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-card: 0 2px 16px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
  --font-mono: 'SF Mono','Fira Code',monospace;
}

*, *::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;
}

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

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

/* ============ UTILITY ============ */
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.hidden { display: none !important; }

.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.section-header h2 em {
  font-style: normal;
  color: var(--primary);
}
.section-header p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
}
.section-divider {
  width: 60px; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ============ ANNOUNCEMENT BAR ============ */
.announce-bar {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary), var(--primary-light));
  padding: 9px 0;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  overflow: hidden;
  position: relative;
}
.announce-bar .announce-inner {
  display: inline-block;
  white-space: nowrap;
  animation: scrollText 28s linear infinite;
  padding-left: 100%;
}
@keyframes scrollText {
  0% { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

/* ============ HEADER ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10,14,26,0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 4px 30px rgba(0,0,0,0.6); }

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

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-wrap img.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}
.logo-wrap .logo-text {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-main);
}
.logo-wrap .logo-text span { color: var(--primary); }

/* ============ NAVIGATION ============ */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(255,107,0,0.1);
}

/* ============ SEARCH BAR ============ */
.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0 16px;
  gap: 8px;
  transition: border-color var(--transition);
  min-width: 220px;
  max-width: 280px;
}
.header-search:focus-within { border-color: var(--primary); }
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 0.88rem;
  width: 100%;
  padding: 8px 0;
  font-family: var(--font-main);
}
.header-search input::placeholder { color: var(--text-dim); }
.header-search button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.header-search button:hover { color: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.btn-join {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 0.88rem;
  font-weight: 700;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-join:hover {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255,107,0,0.4);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============ HERO SECTION ============ */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1.0); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,14,26,0.85) 0%, rgba(255,107,0,0.08) 50%, rgba(10,14,26,0.9) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,107,0,0.15);
  border: 1px solid rgba(255,107,0,0.3);
  color: var(--primary-light);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}
.hero h1 em {
  font-style: normal;
  color: var(--primary);
  display: block;
}
.hero p.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 560px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 36px;
}
.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}
.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(255,107,0,0.45);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-main);
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  border: 1.5px solid var(--border-light);
  transition: all var(--transition);
  cursor: pointer;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255,107,0,0.06);
}

/* ============ TICKER / MARQUEE ============ */
.ticker-section {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  overflow: hidden;
}
.ticker-inner {
  display: flex;
  gap: 60px;
  animation: tickerMove 35s linear infinite;
  white-space: nowrap;
}
.ticker-inner:hover { animation-play-state: paused; }
@keyframes tickerMove {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}
.ticker-item .dot {
  width: 6px; height: 6px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============ VIDEO CARDS ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-grid-featured {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 20px;
}
.video-grid-featured .video-card:first-child {
  grid-row: span 2;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 12px 40px rgba(255,107,0,0.2);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  background: var(--bg-card2);
}
.video-thumb img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform var(--transition);
}
.video-card:first-child .video-thumb img { height: 280px; }
.video-card:hover .video-thumb img { transform: scale(1.05); }

.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.video-card:hover .play-btn { background: rgba(0,0,0,0.45); }
.play-icon {
  width: 52px;
  height: 52px;
  background: rgba(255,107,0,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.7);
  transition: all var(--transition);
}
.video-card:hover .play-icon {
  opacity: 1;
  transform: scale(1);
}
.play-icon::after {
  content: '';
  border-left: 18px solid #fff;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.video-info { padding: 16px; }
.video-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  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: 0.8rem;
  color: var(--text-muted);
}
.video-meta .views::before { content: '▶ '; }
.video-meta .likes::before { content: '♥ '; color: #ff6b6b; }
.video-meta .comments::before { content: '💬 '; }

/* ============ CATEGORY TABS ============ */
.cat-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.cat-tab {
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  background: transparent;
  transition: all var(--transition);
  font-family: var(--font-main);
}
.cat-tab:hover,
.cat-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ============ FEATURE CARDS ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  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(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-light);
  box-shadow: var(--shadow-card);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,107,0,0.12);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}
.feature-card p {
  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(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
  border-color: var(--border-light);
}
.expert-photo {
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: top;
}
.expert-info { padding: 24px; }
.expert-role {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.expert-info h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.expert-tag {
  background: rgba(255,107,0,0.1);
  color: var(--primary-light);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  border: 1px solid rgba(255,107,0,0.2);
}
.expert-btns { display: flex; gap: 10px; }
.btn-sm {
  flex: 1;
  text-align: center;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  transition: all var(--transition);
  border: 1.5px solid var(--border-light);
  color: var(--text-muted);
  cursor: pointer;
  background: transparent;
  font-family: var(--font-main);
}
.btn-sm:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm.primary-sm {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn-sm.primary-sm:hover { background: var(--primary-dark); }

/* ============ PARTNER LOGOS ============ */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
  min-width: 130px;
  text-align: center;
}
.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255,107,0,0.06);
}

/* ============ REVIEW CARDS ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 24px;
  font-size: 4rem;
  color: rgba(255,107,0,0.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-card:hover {
  border-color: var(--border-light);
  box-shadow: var(--shadow-card);
}
.review-stars { color: #FFB800; font-size: 0.9rem; margin-bottom: 12px; }
.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
}
.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  color: #fff;
  flex-shrink: 0;
}
.reviewer-name { font-weight: 700; font-size: 0.9rem; }
.reviewer-label { font-size: 0.78rem; color: var(--text-dim); }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: var(--border-light); }
.faq-item.open { border-color: var(--primary); }
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
  gap: 16px;
  user-select: none;
}
.faq-q .arrow {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255,107,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  color: var(--primary);
  font-size: 0.75rem;
}
.faq-item.open .faq-q .arrow { transform: rotate(180deg); background: var(--primary); color: #fff; }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ============ CONTACT / QR SECTION ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 20px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.contact-item .icon {
  width: 40px;
  height: 40px;
  background: rgba(255,107,0,0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item .label {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 2px;
}
.contact-item .value {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
}
.qr-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.qr-item { text-align: center; }
.qr-box {
  width: 120px;
  height: 120px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
  overflow: hidden;
}
.qr-box canvas { border-radius: 4px; }
.qr-label { font-size: 0.8rem; color: var(--text-muted); font-weight: 600; }

/* ============ SHARE BUTTONS ============ */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  font-family: var(--font-main);
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #000; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); }

/* ============ HOW-TO STEPS ============ */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
  transition: all var(--transition);
}
.step-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
}
.step-num {
  font-size: 2.5rem;
  font-weight: 900;
  color: rgba(255,107,0,0.15);
  line-height: 1;
  margin-bottom: 12px;
}
.step-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============ AI SECTION ============ */
.ai-section { background: var(--bg-section); }
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.ai-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.ai-visual img {
  width: 100%;
  border-radius: var(--radius-lg);
}
.ai-badge-float {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: rgba(10,14,26,0.9);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(10px);
}
.ai-badge-float .ai-dot {
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.ai-badge-float span {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.ai-feature .ai-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(255,107,0,0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.ai-feature h4 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.ai-feature p { font-size: 0.87rem; color: var(--text-muted); line-height: 1.7; }

/* ============ ABOUT BANNER ============ */
.about-banner {
  position: relative;
  padding: 80px 0;
  overflow: hidden;
}
.about-banner-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/mod_shop.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.25);
}
.about-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10,14,26,0.95) 40%, transparent);
}
.about-banner-content {
  position: relative;
  z-index: 2;
  max-width: 560px;
}
.about-banner-content h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 16px;
  line-height: 1.2;
}
.about-banner-content p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 28px;
}

/* ============ STATS BAR ============ */
.stats-bar {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 40px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item .num {
  font-size: 2.2rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-item .label {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.75);
  font-weight: 600;
}

/* ============ FOOTER ============ */
.site-footer {
  background: var(--bg-card);
  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: 48px;
}
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer-col h5 {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 0.87rem;
  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);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-dim);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* ============ TOAST ============ */
.kktu-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-card2);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 9999;
  transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1), opacity 0.3s;
  opacity: 0;
  pointer-events: none;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  white-space: nowrap;
}
.kktu-toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ============ BACK TO TOP ============ */
.back-top {
  position: fixed;
  bottom: 28px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
  border: none;
  box-shadow: 0 4px 16px rgba(255,107,0,0.4);
}
.back-top.visible { opacity: 1; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }
.back-top::after {
  content: '';
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-bottom: 10px solid #fff;
}

/* ============ PAGE BANNER ============ */
.page-banner {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-section) 100%);
  border-bottom: 1px solid var(--border);
  padding: 60px 0 50px;
}
.page-banner h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 10px;
}
.page-banner h1 span { color: var(--primary); }
.page-banner p {
  color: var(--text-muted);
  font-size: 1rem;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--text-dim); }

/* ============ LAZY LOAD ============ */
img[loading="lazy"] { opacity: 0; transition: opacity 0.5s; }
img[loading="lazy"].loaded { opacity: 1; }

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

@media (max-width: 768px) {
  .main-nav { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: rgba(10,14,26,0.98); border-bottom: 1px solid var(--border); padding: 16px; gap: 4px; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .header-search { display: none; }
  .hero { min-height: 80vh; }
  .hero-stats { gap: 24px; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .video-grid-featured { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .hero-stats { flex-wrap: wrap; gap: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}