/* roulang page: index */
:root {
      --primary-orange: #FF6B1A;
      --primary-orange-light: #FF8C42;
      --deep-blue: #0A0E27;
      --deep-blue-soft: #141B2D;
      --accent-cyan: #00D4FF;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-blur: blur(18px);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --card-hover-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
      --text-primary: #F5F7FA;
      --text-secondary: #B0B8C1;
      --text-dark-bg: #1E2330;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background: linear-gradient(135deg, #0A0E27 0%, #141B2D 100%);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 玻璃拟态工具类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease, box-shadow 0.3s ease, border-color 0.2s ease;
    }

    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(0, 212, 255, 0.25);
    }

    .glass-nav {
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary-orange);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      box-shadow: 0 4px 12px rgba(255, 107, 26, 0.3);
      letter-spacing: 0.3px;
      transition: background 0.25s, box-shadow 0.25s, transform 0.15s;
    }

    .btn-primary:hover {
      background: var(--primary-orange-light);
      box-shadow: 0 0 20px rgba(255, 107, 26, 0.7);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: rgba(0, 212, 255, 0.1);
      border-color: rgba(0, 212, 255, 0.7);
      box-shadow: 0 0 16px rgba(0, 212, 255, 0.4);
    }

    .btn-glass {
      background: rgba(255, 255, 255, 0.06);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: white;
      border-radius: var(--radius-pill);
      padding: 0.75rem 2rem;
      font-weight: 600;
    }

    .btn-glass:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: rgba(255, 255, 255, 0.3);
    }

    /* 动画 */
    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(24px); }
      100% { opacity: 1; transform: translateY(0); }
    }

    @keyframes glowPulse {
      0% { box-shadow: 0 0 8px rgba(0, 212, 255, 0.4); }
      50% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.8); }
      100% { box-shadow: 0 0 8px rgba(0, 212, 255, 0.4); }
    }

    .animate-fade-up {
      animation: fadeUp 0.8s ease forwards;
    }

    .breath-glow {
      animation: glowPulse 2.5s infinite;
    }

    /* 导航激活样式 */
    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(25px);
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      padding: 2rem;
      z-index: 100;
    }

    .mobile-menu.open {
      display: flex;
    }

    @media (min-width: 768px) {
      .mobile-menu {
        display: none !important;
      }
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #0A0E27;
    }
    ::-webkit-scrollbar-thumb {
      background: #2A3040;
      border-radius: 3px;
    }