/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-bg: #0A0E17;
      --secondary-bg: #141820;
      --card-bg: #141820;
      --border-soft: rgba(212, 175, 55, 0.08);
      --accent-gold: #D4AF37;
      --accent-gold-hover: #E0C55A;
      --accent-cyan: #00E676;
      --text-primary: #F5F5F7;
      --text-muted: #A1A5AC;
      --dark-blueish: #2A2F3A;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
      --shadow-gold-glow: 0 8px 40px rgba(212, 175, 55, 0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", sans-serif;
      --container-max: 1280px;
      --section-gap: 80px;
      --card-radius: 12px;
      --btn-radius: 8px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--primary-bg);
      color: var(--text-primary);
      line-height: 1.4;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background-color: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(to right, rgba(212, 175, 55, 0.2), transparent 80%);
      transition: background 0.2s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: 1px;
      text-decoration: none;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--text-primary);
      border-bottom-color: var(--accent-gold);
    }

    .btn-primary {
      background: var(--accent-gold);
      border: none;
      color: #0A0E17;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      cursor: pointer;
      font-size: 15px;
      transition: background 0.25s ease, transform 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      cursor: pointer;
      text-decoration: none;
      transition: background 0.25s;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(212, 175, 55, 0.08);
    }

    .text-link {
      color: var(--accent-gold);
      text-decoration: none;
      font-weight: 500;
      transition: opacity 0.2s;
    }

    .text-link:hover {
      text-decoration: underline;
      color: var(--accent-gold-hover);
    }

    /* 移动底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .header-inner {
        justify-content: center;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 20px;
        left: 20px;
        right: 20px;
        background: var(--secondary-bg);
        border-radius: 24px;
        padding: 12px 24px;
        justify-content: space-around;
        align-items: center;
        z-index: 110;
        backdrop-filter: blur(16px);
        background: rgba(20, 24, 32, 0.9);
        box-shadow: 0 8px 30px rgba(0,0,0,0.7);
      }
      .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--text-muted);
        font-size: 12px;
        text-decoration: none;
        gap: 4px;
        transition: color 0.2s;
      }
      .mobile-nav-item.active {
        color: var(--accent-gold);
      }
      .mobile-nav-icon {
        font-size: 18px;
      }
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 1024px) {
      section {
        padding: 60px 0;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    h1 {
      font-size: 56px;
      line-height: 1.1;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 40px;
      line-height: 1.2;
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 24px;
      font-weight: 500;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 48px;
      line-height: 1.7;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      h1 {
        font-size: 44px;
      }
      h2 {
        font-size: 34px;
      }
    }

    @media (max-width: 768px) {
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 30px;
      }
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--card-radius);
      padding: 32px;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-gold-glow);
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-top: 40px;
    }

    .hero-badge {
      font-size: 13px;
      color: var(--accent-gold);
      letter-spacing: 2px;
      font-weight: 500;
      text-transform: uppercase;
      margin-bottom: 20px;
    }

    .hero-image img {
      width: 100%;
      border-radius: 16px;
      box-shadow: 0 0 60px rgba(212,175,55,0.2);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .feature-icon {
      width: 32px;
      height: 32px;
      color: var(--accent-gold);
      margin-bottom: 24px;
    }

    .card-divider {
      height: 2px;
      background: var(--dark-blueish);
      margin-top: 20px;
      transition: background 0.2s;
    }

    .card:hover .card-divider {
      background: var(--accent-gold);
    }

    .price-card {
      position: relative;
      background: var(--card-bg);
      border-radius: var(--card-radius);
      padding: 32px;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-card);
    }

    .price-card.recommended {
      border-color: var(--accent-gold);
      background: #1A1F2B;
    }

    .badge {
      background: var(--accent-gold);
      color: #0A0E17;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 16px;
    }

    .price-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-cyan);
      margin: 16px 0;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
    }

    .faq-item {
      border-bottom: 1px solid var(--dark-blueish);
      padding: 20px 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
    }

    footer {
      background: var(--primary-bg);
      padding: 60px 0 30px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }

    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }