:root {
      --primary: #1a1a2e;
      --accent: #00d4aa;
      --accent-dark: #00b894;
      --bg: #0f0f1a;
      --card: #1e1e30;
      --text: #e8e8f0;
      --text-muted: #a0a0b8;
      --border: #2a2a40;
      --success: #00d4aa;
      --danger: #ff6b6b;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      min-height: 100vh;
    }
    a { color: var(--accent); text-decoration: none; }
    a:hover { text-decoration: underline; }
    
    /* Header */
    header {
      background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .nav {
      max-width: 1100px;
      margin: 0 auto;
      padding: 16px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
    }
    .logo span { color: var(--accent); }
    .nav-links { display: flex; gap: 24px; }
    .nav-links a {
      color: var(--text-muted);
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-links a:hover { color: var(--accent); text-decoration: none; }
    
    /* Hero */
    .hero {
      background: linear-gradient(180deg, #16213e 0%, var(--bg) 100%);
      padding: 60px 20px 80px;
      text-align: center;
    }
    .hero h1 {
      font-size: clamp(1.8rem, 5vw, 2.6rem);
      margin-bottom: 16px;
      font-weight: 700;
      line-height: 1.3;
    }
    .hero h1 span { color: var(--accent); }
    .hero p {
      font-size: 1.1rem;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 32px;
    }
    .cta-btn {
      display: inline-block;
      background: var(--accent);
      color: #0f0f1a;
      font-weight: 700;
      font-size: 1.1rem;
      padding: 14px 40px;
      border-radius: 50px;
      transition: background 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
    }
    .cta-btn:hover {
      background: var(--accent-dark);
      text-decoration: none;
      transform: translateY(-2px);
    }
    .hero-stats {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 48px;
      flex-wrap: wrap;
    }
    .stat {
      text-align: center;
    }
    .stat-num {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    
    /* Sections */
    section {
      max-width: 1100px;
      margin: 0 auto;
      padding: 60px 20px;
    }
    .section-title {
      font-size: 1.8rem;
      margin-bottom: 12px;
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }
    
    /* About */
    .about-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 28px;
      transition: border-color 0.2s;
    }
    .feature-card:hover { border-color: var(--accent); }
    .feature-icon {
      font-size: 2rem;
      margin-bottom: 12px;
    }
    .feature-card h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }
    .feature-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    
    /* Market */
    .market-table {
      width: 100%;
      border-collapse: collapse;
      background: var(--card);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--border);
    }
    .market-table th,
    .market-table td {
      padding: 16px 20px;
      text-align: left;
    }
    .market-table th {
      background: #252540;
      color: var(--text-muted);
      font-weight: 600;
      font-size: 0.9rem;
    }
    .market-table tr:not(:last-child) td {
      border-bottom: 1px solid var(--border);
    }
    .coin-name { font-weight: 600; }
    .coin-symbol { color: var(--text-muted); font-size: 0.85rem; }
    .price-up { color: var(--success); }
    .price-down { color: var(--danger); }
    .note {
      text-align: center;
      color: var(--text-muted);
      font-size: 0.85rem;
      margin-top: 16px;
    }
    
    /* Reviews */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .review-card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 24px;
    }
    .review-stars {
      color: #ffc107;
      margin-bottom: 12px;
      font-size: 1.1rem;
    }
    .review-text {
      color: var(--text);
      margin-bottom: 16px;
      font-size: 0.95rem;
    }
    .review-author {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    
    /* Install steps */
    .steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 24px;
      counter-reset: step;
    }
    .step {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 28px 24px;
      text-align: center;
      position: relative;
    }
    .step::before {
      counter-increment: step;
      content: counter(step);
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: var(--accent);
      color: #0f0f1a;
      font-weight: 700;
      border-radius: 50%;
      margin: 0 auto 16px;
    }
    .step h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .step p {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-q {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-q:hover { color: var(--accent); }
    .faq-q::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--accent);
      transition: transform 0.2s;
    }
    .faq-item.open .faq-q::after { content: "−"; }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    .faq-item.open .faq-a {
      max-height: 300px;
      padding: 0 24px 18px;
    }
    
    /* Final CTA */
    .final-cta {
      text-align: center;
      padding: 60px 20px;
      background: linear-gradient(180deg, var(--bg) 0%, #16213e 100%);
    }
    .final-cta h2 {
      font-size: 1.8rem;
      margin-bottom: 16px;
    }
    .final-cta p {
      color: var(--text-muted);
      margin-bottom: 28px;
    }
    
    /* Footer */
    footer {
      border-top: 1px solid var(--border);
      padding: 32px 20px;
      text-align: center;
      color: var(--text-muted);
      font-size: 0.85rem;
    }
    footer a { color: var(--text-muted); }
    footer a:hover { color: var(--accent); }
    
    @media (max-width: 600px) {
      .nav-links { display: none; }
      .hero-stats { gap: 24px; }
      .market-table th, .market-table td { padding: 12px 10px; font-size: 0.9rem; }
    }