/* roulang page: index */
:root {
      --primary: #0f172a;
      --primary-soft: #1e293b;
      --accent: #facc15;
      --accent-glow: #fbbf24;
      --surface: #ffffff;
      --bg: #f8fafc;
      --text: #1e293b;
      --text-muted: #64748b;
      --border: #e2e8f0;
      --radius-lg: 1.5rem;
      --radius-md: 1rem;
      --radius-sm: 0.75rem;
      --shadow-card: 0 20px 35px -8px rgba(0,0,0,0.05), 0 8px 16px -6px rgba(0,0,0,0.02);
      --shadow-hover: 0 25px 40px -10px rgba(0,0,0,0.1), 0 10px 20px -8px rgba(0,0,0,0.05);
      --transition: all 0.25s ease;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      margin: 0;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 顶部导航 */
    .desktop-nav {
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 0.9rem 0;
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 10px 20px -12px rgba(0,0,0,0.2);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-weight: 700;
      font-size: 1.7rem;
      letter-spacing: 2px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.8rem;
    }
    .logo span {
      background: linear-gradient(135deg, #facc15 0%, #fbbf24 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      color: #cbd5e1;
      font-weight: 500;
      font-size: 1rem;
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
      border-bottom-color: var(--accent);
    }

    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .desktop-nav .nav-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.96);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255,255,255,0.1);
        justify-content: space-around;
        padding: 0.5rem 0.75rem;
        z-index: 60;
        box-shadow: 0 -8px 20px rgba(0,0,0,0.3);
      }
      .mobile-bottom-nav a {
        color: #94a3b8;
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        gap: 0.25rem;
        transition: var(--transition);
        padding: 0.25rem 0.5rem;
        border-radius: 2rem;
      }
      .mobile-bottom-nav a i {
        font-size: 1.3rem;
      }
      .mobile-bottom-nav a.active,
      .mobile-bottom-nav a:hover {
        color: var(--accent);
        background: rgba(250, 204, 21, 0.1);
      }
      body {
        padding-bottom: 80px;
      }
    }

    /* 板块间距 */
    section {
      padding: 4.5rem 0;
    }

    .hero {
      background: url('/assets/images/backpic/back-1.webp') center center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(15, 23, 42, 0.8);
      color: white;
      padding: 7rem 0 6rem;
      position: relative;
    }

    .hero h1 {
      font-size: 3.6rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      text-shadow: 0 10px 20px rgba(0,0,0,0.4);
    }
    .hero .sub {
      font-size: 1.25rem;
      color: #e2e8f0;
      max-width: 650px;
      margin-bottom: 2rem;
    }

    .btn-accent {
      background: var(--accent);
      color: #0f172a;
      font-weight: 700;
      padding: 0.85rem 2.2rem;
      border-radius: 3rem;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      box-shadow: 0 12px 25px -8px rgba(250,204,21,0.4);
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      background: #fbbf24;
      box-shadow: 0 18px 30px -8px rgba(250,204,21,0.6);
      transform: translateY(-2px);
      color: #0f172a;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    .card-custom {
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
      border: 1px solid var(--border);
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-5px);
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    .badge-star {
      background: #fef3c7;
      color: #92400e;
      padding: 0.35rem 1rem;
      border-radius: 2rem;
      font-weight: 600;
      font-size: 0.85rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 1.2rem 0;
    }

    footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 3rem 0 1.5rem;
      font-size: 0.95rem;
    }

    @media (max-width: 1024px) {
      .hero h1 {
        font-size: 2.8rem;
      }
    }

    @media (max-width: 640px) {
      .hero {
        padding: 4.5rem 0 4rem;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
      .section-title {
        font-size: 2rem;
      }
    }