/* roulang page: index */
:root {
      --deep-space: #080C1A;
      --card-bg: #111633;
      --primary-purple: #6C3CE1;
      --neon-cyan: #00F0FF;
      --text-white: #FFFFFF;
      --text-body: #B0B8D6;
      --text-muted: #8890B5;
      --success-green: #00E676;
      --warning-orange: #FF6D00;
      --glass-bg: rgba(17, 22, 51, 0.6);
      --glass-border: rgba(108, 60, 225, 0.25);
      --card-radius-lg: 16px;
      --card-radius-sm: 12px;
      --btn-radius: 12px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-mono: 'Inter', 'SF Mono', 'PingFang SC', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-space);
      color: var(--text-body);
      font-family: var(--font-body);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
    }

    a {
      color: var(--neon-cyan);
      text-decoration: none;
      transition: color 0.25s;
    }
    a:hover {
      color: var(--primary-purple);
    }

    .container {
      max-width: 1200px;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px) saturate(180%);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius-lg);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 0 0 1px rgba(108, 60, 225, 0.15);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      background: rgba(17, 22, 51, 0.8);
      border-color: rgba(0, 240, 255, 0.5);
      box-shadow: 0 12px 40px rgba(0, 240, 255, 0.2);
      transform: translateY(-4px);
    }

    /* 按钮 */
    .btn-primary-glow {
      background: linear-gradient(135deg, #6C3CE1 0%, #8B5CF6 100%);
      border: none;
      border-radius: var(--btn-radius);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      box-shadow: 0 0 20px rgba(108, 60, 225, 0.5);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary-glow:hover {
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
      background: linear-gradient(135deg, #6C3CE1 0%, #00F0FF 100%);
      transform: scale(1.05);
      color: white;
    }

    .btn-outline-neon {
      background: transparent;
      border: 2px solid rgba(108, 60, 225, 0.6);
      color: var(--neon-cyan);
      border-radius: var(--btn-radius);
      padding: 12px 32px;
      font-weight: 600;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    .btn-outline-neon:hover {
      background: rgba(108, 60, 225, 0.15);
      border-color: var(--neon-cyan);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
      color: var(--neon-cyan);
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(8, 12, 26, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid;
      border-image: linear-gradient(90deg, #6C3CE1, #00F0FF, transparent) 1;
      transition: background 0.3s;
    }
    .navbar-scrolled {
      background: rgba(8, 12, 26, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .navbar-brand {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: white !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-link {
      color: var(--text-body) !important;
      font-weight: 500;
      margin: 0 8px;
      transition: 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--neon-cyan) !important;
      text-shadow: 0 0 8px rgba(0,240,255,0.5);
    }
    .navbar-toggler {
      border-color: rgba(108,60,225,0.5);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 240, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Hero */
    .hero-section {
      background: radial-gradient(circle at 30% 40%, #1a1035 0%, #080C1A 70%);
      position: relative;
      overflow: hidden;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(to right, #FFFFFF, #E0E7FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.2;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-weight: 700;
      color: var(--neon-cyan);
      font-size: 2rem;
    }

    /* 标题装饰 */
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 2rem;
      padding-left: 18px;
      border-left: 4px solid var(--neon-cyan);
    }

    /* 横向滚动 */
    .scroll-container {
      display: flex;
      overflow-x: auto;
      gap: 24px;
      padding-bottom: 10px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary-purple) transparent;
    }
    .scroll-container::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-container::-webkit-scrollbar-thumb {
      background: var(--primary-purple);
      border-radius: 8px;
    }
    .scenario-card {
      min-width: 300px;
      max-width: 320px;
      height: 260px;
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border-radius: var(--card-radius-lg);
      border: 1px solid var(--glass-border);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    /* FAQ */
    .faq-item {
      background: rgba(17, 22, 51, 0.5);
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid rgba(108,60,225,0.2);
    }
    .faq-question {
      cursor: pointer;
      padding: 18px 24px;
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s;
      padding: 0 24px;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 12px 24px 18px;
    }

    footer a {
      color: var(--text-muted);
    }
    footer a:hover {
      color: var(--neon-cyan);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .section-title {
        font-size: 1.9rem;
      }
    }