/* roulang page: index */
:root {
      --primary: #e53e3e;
      --primary-dark: #c53030;
      --primary-light: #fc8181;
      --accent: #f6ad55;
      --bg-dark: #0b0e14;
      --bg-card: #1a1f2b;
      --bg-surface: #252b38;
      --text-main: #f7fafc;
      --text-soft: #a0aec0;
      --text-muted: #718096;
      --border-light: #2d3748;
      --border-strong: #4a5568;
      --radius-sm: 0.75rem;
      --radius-md: 1.25rem;
      --radius-lg: 2rem;
      --shadow-sm: 0 10px 20px -8px rgba(0,0,0,0.5);
      --shadow-glow: 0 0 18px rgba(229, 62, 62, 0.35);
      --transition: 0.2s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      z-index: 99;
      transition: background 0.3s;
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }
    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, #fff 0%, #e2e8f0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-soft);
      transition: color var(--transition);
      font-size: 0.95rem;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.7rem 1.9rem;
      border-radius: 2.5rem;
      font-weight: 600;
      font-size: 0.95rem;
      transition: all var(--transition);
      box-shadow: 0 4px 12px rgba(229,62,62,0.4);
      letter-spacing: 0.3px;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 10px 20px rgba(229,62,62,0.55);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      font-size: 1.8rem;
      color: white;
    }

    /* 首屏 hero */
    .hero {
      padding: 160px 0 100px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      min-height: 85vh;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,14,20,0.9) 30%, rgba(11,14,20,0.65) 100%);
    }
    .hero-content {
      position: relative;
      max-width: 700px;
    }
    .hero-badge {
      background: rgba(229,62,62,0.15);
      border: 1px solid var(--primary);
      color: var(--primary-light);
      padding: 0.35rem 1.2rem;
      border-radius: 3rem;
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-block;
      margin-bottom: 1.8rem;
      backdrop-filter: blur(6px);
    }
    h1 {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
      color: white;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: #cbd5e0;
      margin-bottom: 2.5rem;
      max-width: 550px;
    }
    .hero-stats {
      display: flex;
      gap: 2.5rem;
      margin-top: 1.8rem;
    }
    .stat-item h3 {
      font-size: 2rem;
      font-weight: 700;
      color: white;
    }
    .stat-item p {
      color: var(--text-soft);
      font-size: 0.9rem;
    }

    /* 通用板块 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-sub {
      color: var(--text-soft);
      text-align: center;
      margin-bottom: 3.2rem;
      font-size: 1.1rem;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 2rem 1.8rem;
      transition: all 0.25s;
    }
    .feature-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
      transform: translateY(-6px);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.4rem;
    }

    .live-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }

    .ranking-list {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 1.5rem;
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      margin-bottom: 1rem;
      padding: 1.2rem 1.8rem;
      transition: 0.2s;
    }
    .faq-item:hover {
      border-color: var(--primary);
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #1e2430 0%, #0f131c 100%);
      border-radius: var(--radius-lg);
      padding: 3.5rem 2.5rem;
      text-align: center;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-blend-mode: overlay;
    }

    .footer {
      border-top: 1px solid var(--border-light);
      padding: 2.5rem 0;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      h1 { font-size: 2.6rem; }
      .hero-stats { flex-wrap: wrap; gap: 1.2rem; }
      .grid-3 { grid-template-columns: 1fr; }
    }