/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --secondary: #7B2FFF;
      --bg: #0B0E14;
      --card-bg: rgba(20, 26, 36, 0.75);
      --card-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6A7B8D;
      --glow: 0 0 18px rgba(10, 110, 255, 0.7);
      --radius-lg: 1.5rem;
      --radius-xl: 0.75rem;
      --radius-md: 0.5rem;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 35px rgba(0, 0, 0, 0.25);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.2s;
    }

    .glass-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 25px 45px rgba(10, 110, 255, 0.2);
      border-color: rgba(10, 110, 255, 0.4);
    }

    .text-gradient {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: white;
      border: none;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-xl);
      font-weight: 600;
      cursor: pointer;
      box-shadow: var(--glow);
      transition: all 0.25s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      letter-spacing: 0.3px;
      text-decoration: none;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(10, 110, 255, 0.9);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: white;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-xl);
      font-weight: 500;
      cursor: pointer;
      transition: all 0.25s;
      backdrop-filter: blur(8px);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    .btn-outline:hover {
      border-color: var(--primary);
      background: rgba(10, 110, 255, 0.1);
      box-shadow: 0 0 12px rgba(10, 110, 255, 0.4);
    }

    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.4rem 0;
    }

    .nav-link:hover, .nav-link.active {
      color: white;
    }

    .nav-link.active {
      border-left: 3px solid var(--primary);
      padding-left: 1rem;
    }

    input, textarea {
      background: rgba(20, 26, 36, 0.8);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-md);
      padding: 0.9rem 1.2rem;
      color: white;
      width: 100%;
      transition: border 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 12px rgba(10,110,255,0.5);
    }

    .counter {
      font-variant-numeric: tabular-nums;
      font-family: 'Inter', system-ui;
    }

    @keyframes pulse-glow {
      0% { text-shadow: 0 0 5px rgba(10,110,255,0.3); }
      50% { text-shadow: 0 0 18px rgba(10,110,255,0.8); }
      100% { text-shadow: 0 0 5px rgba(10,110,255,0.3); }
    }

    .metric-glow:hover .counter {
      animation: pulse-glow 1.2s infinite;
    }

    .divider {
      height: 2px;
      background: linear-gradient(90deg, transparent, rgba(10,110,255,0.4), transparent);
      margin: 2rem 0;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none !important;
      }
      .mobile-nav {
        display: flex !important;
      }
      .hero-left {
        width: 100%;
        padding-right: 0;
      }
      .hero-right {
        width: 100%;
        height: 280px;
        margin-top: 2rem;
      }
      .split-layout {
        flex-direction: column;
      }
    }

    @media (min-width: 769px) {
      .mobile-nav {
        display: none !important;
      }
      .split-layout {
        flex-direction: row;
      }
      .hero-left {
        width: 40%;
      }
      .hero-right {
        width: 60%;
        height: auto;
        min-height: 560px;
      }
    }