/* ============================================
   Ethereum (mzceb.cn) - Main Stylesheet
   Original Design - All Rights Reserved 2026
   ============================================ */

/* ---- CSS Variables / Design Tokens ---- */
:root {
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --primary-light: #818CF8;
  --accent: #7C3AED;
  --accent-light: #A78BFA;
  --teal: #0EA5E9;
  --teal-light: #38BDF8;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --dark: #0F0F1A;
  --dark-2: #1A1A2E;
  --dark-3: #16213E;
  --gray-900: #111827;
  --gray-800: #1F2937;
  --gray-700: #374151;
  --gray-600: #4B5563;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --white: #FFFFFF;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Courier New', monospace;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow: 0 4px 16px rgba(79,70,229,0.15);
  --shadow-lg: 0 8px 32px rgba(79,70,229,0.25);
  --shadow-xl: 0 20px 60px rgba(79,70,229,0.3);
  --transition: 0.3s ease;
  --max-width: 1280px;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--gray-800);
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
}
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }
p { margin-bottom: 1rem; color: var(--gray-600); }

/* ---- Layout ---- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.section-lg { padding: 120px 0; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}
.btn-white {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}
.btn-white:hover {
  background: var(--gray-100);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn-sm { padding: 8px 18px; font-size: 0.875rem; }
.btn-lg { padding: 16px 36px; font-size: 1.125rem; }

/* ---- Badges ---- */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge-primary { background: rgba(79,70,229,0.1); color: var(--primary); }
.badge-accent { background: rgba(124,58,237,0.1); color: var(--accent); }
.badge-teal { background: rgba(14,165,233,0.1); color: var(--teal); }
.badge-success { background: rgba(16,185,129,0.1); color: var(--success); }

/* ---- Cards ---- */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}
.card-dark {
  background: var(--dark-2);
  border-color: rgba(255,255,255,0.08);
  color: var(--white);
}
.card-dark h3, .card-dark h4 { color: var(--white); }
.card-dark p { color: var(--gray-400); }

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.site-logo img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}
.site-logo .logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-item {
  position: relative;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: rgba(79,70,229,0.06);
}
.nav-link svg { width: 14px; height: 14px; transition: transform var(--transition); }
.nav-item:hover .nav-link svg { transform: rotate(180deg); }

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 100;
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--gray-700);
  transition: all var(--transition);
}
.nav-dropdown a:hover {
  background: rgba(79,70,229,0.06);
  color: var(--primary);
}

/* Search Bar */
.header-search {
  flex: 1;
  max-width: 360px;
  position: relative;
}
.header-search input {
  width: 100%;
  padding: 9px 16px 9px 40px;
  border: 1.5px solid var(--gray-200);
  border-radius: 100px;
  font-size: 0.875rem;
  background: var(--gray-100);
  color: var(--gray-800);
  transition: all var(--transition);
  outline: none;
}
.header-search input:focus {
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.header-search .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  pointer-events: none;
}
.header-actions { display: flex; align-items: center; gap: 12px; }
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0F0F2E 0%, #1A1A4E 40%, #0D1B3E 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,15,46,0.7) 0%, rgba(79,70,229,0.2) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 80px 0;
}
.hero-eyebrow {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(79,70,229,0.3);
  border: 1px solid rgba(129,140,248,0.4);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero h1 {
  color: var(--white);
  margin-bottom: 20px;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.1;
}
.hero h1 span {
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 560px;
}
.hero-desc p { color: rgba(255,255,255,0.75); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat-item {}
.hero-stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}
.hero-stat-label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.55);
  margin-top: 4px;
}

/* ============================================
   TICKER / PRICE BAR
   ============================================ */
.price-ticker {
  background: var(--dark-2);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 10px 0;
  overflow: hidden;
}
.ticker-inner {
  display: flex;
  gap: 40px;
  animation: tickerScroll 30s linear infinite;
  white-space: nowrap;
}
.ticker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--gray-300);
}
.ticker-item .coin-name { font-weight: 700; color: var(--white); }
.ticker-item .price { color: var(--primary-light); }
.ticker-item .change-up { color: var(--success); }
.ticker-item .change-down { color: var(--danger); }
@keyframes tickerScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header { margin-bottom: 56px; }
.section-header.text-center { text-align: center; }
.section-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 1.1rem; max-width: 600px; }
.section-header.text-center p { margin: 0 auto; }

/* ============================================
   FEATURES / MODULES
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
}
.feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}
.feature-icon.blue { background: rgba(79,70,229,0.1); }
.feature-icon.purple { background: rgba(124,58,237,0.1); }
.feature-icon.teal { background: rgba(14,165,233,0.1); }
.feature-icon.green { background: rgba(16,185,129,0.1); }
.feature-icon.orange { background: rgba(245,158,11,0.1); }
.feature-card h3 { margin-bottom: 12px; font-size: 1.2rem; }
.feature-card p { font-size: 0.9rem; margin-bottom: 20px; }
.feature-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.feature-link:hover { gap: 10px; }

/* ============================================
   STATS SECTION
   ============================================ */
.stats-section {
  background: linear-gradient(135deg, var(--dark-2) 0%, var(--dark-3) 100%);
  padding: 80px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.stat-card {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  transition: all var(--transition);
}
.stat-card:hover {
  background: rgba(79,70,229,0.15);
  border-color: rgba(79,70,229,0.4);
  transform: translateY(-4px);
}
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-number span { color: var(--primary-light); }
.stat-label {
  font-size: 0.875rem;
  color: var(--gray-400);
  font-weight: 500;
}

/* ============================================
   VIDEO CARDS
   ============================================ */
.video-section { background: var(--gray-100); }
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark-2);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-circle {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: transform var(--transition);
}
.video-card:hover .play-circle { transform: scale(1); }
.play-circle svg { width: 24px; height: 24px; color: var(--primary); margin-left: 4px; }
.video-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--primary);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.05em;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: var(--white);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 20px; }
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-bottom: 8px;
}
.video-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
  line-height: 1.4;
}
.video-stats {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--gray-500);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ============================================
   NEWS CARDS
   ============================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}
.news-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--primary-light); }
.news-thumb {
  aspect-ratio: 16/9;
  overflow: hidden;
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.news-card:hover .news-thumb img { transform: scale(1.05); }
.news-body { padding: 24px; }
.news-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 10px;
}
.news-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-excerpt {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--gray-400);
  padding-top: 16px;
  border-top: 1px solid var(--gray-100);
}

/* ============================================
   EXPERTS SECTION
   ============================================ */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.expert-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--primary-light);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--white);
  font-weight: 700;
}
.expert-name { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.expert-title { font-size: 0.85rem; color: var(--primary); font-weight: 600; margin-bottom: 12px; }
.expert-bio { font-size: 0.875rem; color: var(--gray-500); margin-bottom: 16px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 20px; }
.expert-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--gray-100);
  border-radius: 100px;
  color: var(--gray-600);
}
.expert-actions { display: flex; gap: 10px; justify-content: center; }

/* ============================================
   REVIEWS / TESTIMONIALS
   ============================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}
.review-card:hover { box-shadow: var(--shadow); border-color: var(--primary-light); }
.review-stars { display: flex; gap: 4px; margin-bottom: 12px; color: var(--warning); font-size: 1rem; }
.review-text { font-size: 0.95rem; color: var(--gray-600); margin-bottom: 20px; font-style: italic; line-height: 1.7; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.review-name { font-weight: 700; font-size: 0.9rem; color: var(--gray-900); }
.review-role { font-size: 0.8rem; color: var(--gray-400); }

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item.open { border-color: var(--primary-light); box-shadow: var(--shadow); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: var(--gray-900);
  font-size: 1rem;
  transition: all var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}
.faq-item.open .faq-icon { background: var(--primary); transform: rotate(45deg); }
.faq-icon svg { width: 14px; height: 14px; }
.faq-item.open .faq-icon svg { color: var(--white); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.open .faq-answer { max-height: 400px; }
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.7;
}

/* ============================================
   PARTNERS / LOGO WALL
   ============================================ */
.partners-section { background: var(--gray-100); }
.partners-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
  align-items: center;
}
.partner-logo {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--gray-500);
  transition: all var(--transition);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.partner-logo:hover { border-color: var(--primary-light); color: var(--primary); box-shadow: var(--shadow-sm); }

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  padding: 80px 0;
  text-align: center;
}
.cta-section h2 { color: var(--white); margin-bottom: 16px; }
.cta-section p { color: rgba(255,255,255,0.8); font-size: 1.1rem; max-width: 560px; margin: 0 auto 36px; }

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info h3 { margin-bottom: 20px; }
.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}
.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: rgba(79,70,229,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}
.contact-label { font-size: 0.8rem; color: var(--gray-400); margin-bottom: 2px; }
.contact-value { font-weight: 600; color: var(--gray-800); }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px; }
.qr-item { text-align: center; }
.qr-code {
  width: 120px;
  height: 120px;
  margin: 0 auto 8px;
  background: var(--gray-100);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--gray-400);
  overflow: hidden;
}
.qr-code svg { width: 100px; height: 100px; }
.qr-label { font-size: 0.8rem; color: var(--gray-500); }

/* ============================================
   SOCIAL SHARE
   ============================================ */
.social-share { display: flex; gap: 12px; flex-wrap: wrap; }
.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
  text-decoration: none;
  border: 1.5px solid transparent;
}
.social-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.social-btn.twitter { background: #1DA1F2; color: white; }
.social-btn.youtube { background: #FF0000; color: white; }
.social-btn.tiktok { background: #000000; color: white; }
.social-btn.bilibili { background: #00A1D6; color: white; }
.social-btn.telegram { background: #0088CC; color: white; }
.social-btn.wechat { background: #07C160; color: white; }

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--dark);
  color: var(--gray-300);
  padding: 72px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand .logo-text { color: var(--white); -webkit-text-fill-color: var(--white); background: none; }
.footer-desc { font-size: 0.9rem; color: var(--gray-500); line-height: 1.7; margin-bottom: 24px; }
.footer-col h4 {
  color: var(--white);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 0.875rem;
  color: var(--gray-500);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--primary-light); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 0.85rem;
  color: var(--gray-600);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a { color: var(--gray-500); }
.footer-bottom a:hover { color: var(--primary-light); }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 0.9rem;
  transition: all var(--transition);
}
.footer-social a:hover { background: var(--primary); color: var(--white); }
.update-time { color: var(--gray-600); font-size: 0.8rem; }

/* ============================================
   BREADCRUMB
   ============================================ */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.875rem;
  color: var(--gray-400);
}
.breadcrumb ol { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li:not(:last-child)::after { content: '/'; color: var(--gray-300); }
.breadcrumb a { color: var(--gray-500); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb li:last-child { color: var(--gray-700); font-weight: 500; }

/* ============================================
   PAGE HERO (INNER PAGES)
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--dark-2) 0%, var(--dark-3) 100%);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79,70,229,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.page-hero h1 { color: var(--white); margin-bottom: 12px; }
.page-hero p { color: var(--gray-400); font-size: 1.1rem; max-width: 600px; }

/* ============================================
   INNER PAGE CONTENT
   ============================================ */
.content-article { max-width: 860px; }
.content-article h2 { margin: 40px 0 16px; padding-top: 40px; border-top: 1px solid var(--gray-200); }
.content-article h2:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }
.content-article h3 { margin: 28px 0 12px; }
.content-article p { margin-bottom: 1.2rem; line-height: 1.8; }
.content-article img { border-radius: var(--radius); margin: 24px 0; }
.content-article ul, .content-article ol { padding-left: 24px; margin-bottom: 1.2rem; }
.content-article li { margin-bottom: 8px; color: var(--gray-600); line-height: 1.7; }
.content-article blockquote {
  border-left: 4px solid var(--primary);
  padding: 16px 24px;
  background: rgba(79,70,229,0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--gray-700);
}

/* Sidebar */
.content-layout { display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: start; }
.sidebar {}
.sidebar-widget {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}
.sidebar-widget h4 { margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--gray-100); }
.sidebar-news-item { display: flex; gap: 12px; margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--gray-100); }
.sidebar-news-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.sidebar-news-thumb { width: 64px; height: 48px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; }
.sidebar-news-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-news-title { font-size: 0.85rem; font-weight: 600; color: var(--gray-800); line-height: 1.4; margin-bottom: 4px; }
.sidebar-news-date { font-size: 0.75rem; color: var(--gray-400); }

/* ============================================
   COMMENT / QA SECTION
   ============================================ */
.comments-section { margin-top: 48px; }
.comment-list { margin-bottom: 32px; }
.comment-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--gray-100);
}
.comment-item:last-child { border-bottom: none; }
.comment-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  flex-shrink: 0;
}
.comment-body {}
.comment-header { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.comment-name { font-weight: 700; font-size: 0.9rem; color: var(--gray-900); }
.comment-date { font-size: 0.8rem; color: var(--gray-400); }
.comment-text { font-size: 0.9rem; color: var(--gray-600); line-height: 1.6; }

/* ============================================
   UTILITY CLASSES
   ============================================ */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.hidden { display: none; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--gray-400); }
.text-white { color: var(--white); }
.bg-light { background: var(--gray-100); }
.bg-dark { background: var(--dark-2); }
.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: var(--radius-lg); }
.w-full { width: 100%; }
.overflow-hidden { overflow: hidden; }
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { inset: 0; }
.z-1 { z-index: 1; }
.z-2 { z-index: 2; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .content-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .main-nav { display: none; }
  .mobile-menu-btn { display: flex; }
  .header-search { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-content { padding: 56px 0; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr; }
}

/* ============================================
   MOBILE MENU
   ============================================ */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--white);
  padding: 80px 24px 24px;
  overflow-y: auto;
  flex-direction: column;
  gap: 8px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  display: block;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-100);
}
.mobile-nav a:hover { background: var(--gray-100); color: var(--primary); }
.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--gray-700);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.animate-fade-up { animation: fadeInUp 0.6s ease both; }
.animate-fade { animation: fadeIn 0.6s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ============================================
   PRICE CHART PLACEHOLDER
   ============================================ */
.price-chart-container {
  background: var(--dark-2);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid rgba(255,255,255,0.06);
}
.price-chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.price-current { font-size: 2rem; font-weight: 800; color: var(--white); }
.price-change { font-size: 0.9rem; font-weight: 600; padding: 4px 10px; border-radius: 100px; }
.price-change.up { background: rgba(16,185,129,0.15); color: var(--success); }
.price-change.down { background: rgba(239,68,68,0.15); color: var(--danger); }
.chart-canvas {
  width: 100%;
  height: 200px;
  position: relative;
  overflow: hidden;
}
.chart-canvas canvas { width: 100% !important; height: 100% !important; }

/* ============================================
   TABLE STYLES
   ============================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.data-table th {
  text-align: left;
  padding: 12px 16px;
  background: var(--gray-100);
  color: var(--gray-600);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--gray-200);
}
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}
.data-table tr:hover td { background: rgba(79,70,229,0.03); }
.data-table .coin-cell { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--gray-900); }

/* ============================================
   HOW-TO GUIDE STEPS
   ============================================ */
.steps-list { counter-reset: step; }
.step-item {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--gray-100);
}
.step-item:last-child { border-bottom: none; }
.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step-content h4 { margin-bottom: 8px; }
.step-content p { font-size: 0.95rem; margin-bottom: 0; }

/* ============================================
   LANGUAGE SWITCHER
   ============================================ */
.lang-switcher {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--primary);
  border-radius: 20px;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
  gap: 0;
}
.lang-switcher a {
  display: inline-block;
  padding: 5px 11px;
  color: var(--primary);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
  line-height: 1.4;
}
.lang-switcher a.active {
  background: var(--primary);
  color: #fff;
}
.lang-switcher a:hover:not(.active) {
  background: rgba(79,70,229,0.08);
  color: var(--primary);
}
.lang-switcher .lang-sep {
  display: inline-block;
  width: 1px;
  height: 16px;
  background: var(--primary);
  opacity: 0.35;
  align-self: center;
}
@media (max-width: 768px) {
  .lang-switcher { font-size: 0.72rem; }
  .lang-switcher a { padding: 4px 8px; }
}

/* ===== Language Switcher ===== */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: 8px;
  overflow: hidden;
  font-size: 0.82rem;
  font-weight: 600;
}
.lang-switcher a {
  padding: 6px 12px;
  color: var(--gray-500);
  text-decoration: none;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}
.lang-switcher a:hover {
  background: rgba(99,102,241,0.12);
  color: var(--primary);
}
.lang-switcher a.active {
  background: var(--primary);
  color: #fff;
}
.lang-sep {
  width: 1px;
  height: 20px;
  background: rgba(99,102,241,0.25);
  display: inline-block;
}

/* ===== Video Card Styles ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.video-card {
  background: var(--dark-3, #1e1e2e);
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.25s, box-shadow 0.25s;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
}
.video-thumb {
  position: relative;
  overflow: hidden;
}
.video-thumb img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  transition: transform 0.3s;
}
.video-card:hover .video-thumb img {
  transform: scale(1.05);
}
.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s;
}
.video-card:hover .video-overlay {
  opacity: 1;
}
.play-btn {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary);
  padding-left: 4px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-info {
  padding: 14px 16px;
}
.video-info h4 {
  font-size: 0.88rem;
  color: #e2e8f0;
  margin: 0 0 6px;
  line-height: 1.4;
}
.video-views {
  font-size: 0.78rem;
  color: #94a3b8;
}

/* ===== Stats Grid ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-item {
  color: #fff;
}
.stat-icon {
  font-size: 1.8rem;
  margin-bottom: 8px;
}
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: #818CF8;
  line-height: 1.1;
}
.stat-label {
  font-size: 0.85rem;
  color: #94a3b8;
  margin-top: 6px;
}

/* ===== Expert Card ===== */
.expert-card {
  text-align: center;
  padding: 28px 20px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ===== Review Card ===== */
.review-card {
  padding: 24px;
}

/* ===== Ticker Bar ===== */
.ticker-bar {
  background: var(--dark-2, #13131f);
  overflow: hidden;
  white-space: nowrap;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.ticker-track {
  display: inline-flex;
  gap: 48px;
  animation: ticker-scroll 30s linear infinite;
}
.ticker-track span {
  font-size: 0.82rem;
  color: #94a3b8;
  font-weight: 500;
}
.ticker-track .up { color: #10B981; }
.ticker-track .down { color: #EF4444; }
@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ===== Hero Section ===== */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  background: var(--dark-2, #13131f);
}
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,15,30,0.85) 0%, rgba(99,102,241,0.25) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-top: 80px;
  padding-bottom: 80px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
  margin: 12px 0 20px;
}
.hero-sub {
  font-size: 1.15rem;
  color: #cbd5e1;
  max-width: 560px;
  margin: 0 auto;
}

/* ===== Responsive: video grid & stats ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .video-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
  .lang-switcher a { padding: 5px 9px; font-size: 0.78rem; }
}