/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --secondary-deep: #101536;
      --accent-green: #00D4AA;
      --accent-red: #FF4655;
      --golden: #C8AA6E;
      --text-primary: #FFFFFF;
      --text-secondary: #B8C1D9;
      --text-muted: #6B7294;
      --card-bg: rgba(20, 25, 55, 0.65);
      --card-border: rgba(0, 212, 170, 0.15);
      --glow-green: 0 0 24px rgba(0, 212, 170, 0.5);
      --glow-green-hover: 0 0 36px rgba(0, 212, 170, 0.8);
      --glass-blur: blur(20px) saturate(180%);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'DIN Alternate', 'Roboto Mono', monospace;
      --font-body: 'PingFang SC', 'Noto Sans SC', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--primary-deep);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 212, 170, 0.1);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(0, 212, 170, 0.4);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 212, 170, 0.25);
    }

    .score-number {
      font-family: var(--font-number);
      font-weight: 700;
    }

    .btn-glow-primary {
      background: linear-gradient(135deg, #00D4AA, #00B894);
      color: #0A0E27;
      font-weight: 700;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      box-shadow: var(--glow-green), 0 4px 12px rgba(0,0,0,0.3);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
    }
    .btn-glow-primary:hover {
      box-shadow: var(--glow-green-hover), 0 6px 16px rgba(0,0,0,0.4);
      transform: translateY(-2px);
    }

    .btn-glow-secondary {
      background: transparent;
      border: 1.5px solid rgba(0, 212, 170, 0.5);
      color: #00D4AA;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    .btn-glow-secondary:hover {
      border-color: #00D4AA;
      background: rgba(0, 212, 170, 0.08);
      box-shadow: 0 0 16px rgba(0,212,170,0.3);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 212, 170, 0.2);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-link {
      color: #B8C1D9;
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-link:hover {
      color: #00D4AA;
    }

    /* 粒子背景动画 */
    @keyframes float-particle {
      0% { transform: translateY(0px) scale(1); opacity: 0.3; }
      50% { transform: translateY(-20px) scale(1.2); opacity: 0.7; }
      100% { transform: translateY(0px) scale(1); opacity: 0.3; }
    }
    .particle {
      position: absolute;
      background: rgba(0, 212, 170, 0.4);
      border-radius: 50%;
      width: 4px;
      height: 4px;
      animation: float-particle 4s infinite ease-in-out;
    }

    /* 脉冲光效 */
    @keyframes pulse-glow {
      0% { text-shadow: 0 0 8px rgba(0,212,170,0.4); }
      50% { text-shadow: 0 0 18px rgba(0,212,170,0.9); }
      100% { text-shadow: 0 0 8px rgba(0,212,170,0.4); }
    }
    .pulse-text {
      animation: pulse-glow 2s infinite;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 767px) {
      .desktop-menu {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
      .hero-container {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
    }