/* roulang page: index */
:root {
      --primary: #0B0C10;
      --accent: #7B2FF7;
      --cta: #FF5E13;
      --surface: #1A1B23;
      --border: rgba(123, 47, 247, 0.25);
      --text: #F0F0F5;
      --text-muted: rgba(240, 240, 245, 0.65);
      --radius-card: 1rem;
      --radius-btn: 0.75rem;
      --shadow-card: 0 8px 32px rgba(123, 47, 247, 0.12);
      --shadow-glow: 0 0 24px rgba(123, 47, 247, 0.5);
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--primary);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s ease;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      transition: all 0.3s ease;
    }

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

    .glass-card {
      background: rgba(26, 27, 35, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    .glow-hover:hover {
      box-shadow: 0 16px 48px rgba(123, 47, 247, 0.25);
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border: none;
      box-shadow: 0 4px 12px rgba(123, 47, 247, 0.3);
    }

    .btn-primary:hover {
      background: #9355FF;
      box-shadow: 0 0 28px rgba(123, 47, 247, 0.6);
      transform: translateY(-1px);
    }

    .btn-cta {
      background: var(--cta);
      color: white;
      padding: 0.75rem 2.25rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border: none;
      box-shadow: 0 4px 14px rgba(255, 94, 19, 0.4);
    }

    .btn-cta:hover {
      background: #FF7A38;
      box-shadow: 0 0 28px rgba(255, 94, 19, 0.7);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    .btn-ghost:hover {
      background: var(--accent);
      color: white;
      box-shadow: 0 0 20px rgba(123, 47, 247, 0.5);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--accent), var(--cta));
      border-radius: 4px;
    }

    .text-gradient {
      background: linear-gradient(135deg, #7B2FF7 0%, #FF5E13 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.75rem;
      }
    }

    .mobile-menu-open {
      overflow: hidden;
    }