/* roulang page: index */
:root {
      --deep-indigo: #0B0E2F;
      --darker-purple: #1A1035;
      --electric-cyan: #00E5FF;
      --warm-amber: #FF8C42;
      --surface-glass: rgba(255, 255, 255, 0.04);
      --border-glass: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7D99;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
      --shadow-card-hover: 0 8px 40px rgba(0, 229, 255, 0.15);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-img: 16px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: 'Inter', 'SF Pro Display', system-ui;
      --backdrop-blur: blur(16px);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-indigo);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-primary);
      font-weight: 600;
    }

    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
    }

    h2 {
      font-size: 2rem;
      font-weight: 600;
      position: relative;
      display: inline-block;
      margin-bottom: 2rem;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 40px;
      height: 3px;
      background: var(--electric-cyan);
      border-radius: 2px;
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
    }

    .section-title {
      margin-bottom: 3rem;
    }

    .glass-card {
      background: var(--surface-glass);
      backdrop-filter: var(--backdrop-blur);
      -webkit-backdrop-filter: var(--backdrop-blur);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }

    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(0, 229, 255, 0.25);
    }

    .btn-primary-custom {
      background: var(--warm-amber);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      box-shadow: 0 0 20px rgba(255, 140, 66, 0.4);
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary-custom:hover {
      background: #ff9f5a;
      box-shadow: 0 0 28px rgba(255, 140, 66, 0.6);
      transform: translateY(-2px);
      color: white;
    }

    .btn-outline-cyan {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline-cyan:hover {
      background: rgba(0, 229, 255, 0.08);
      color: var(--electric-cyan);
    }

    .btn-ghost-white {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.5);
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      transition: all 0.3s ease;
    }

    .btn-ghost-white:hover {
      background: rgba(255,255,255,0.1);
      color: white;
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(11, 14, 47, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      height: 64px;
      z-index: 1030;
    }

    .navbar-brand-custom {
      font-weight: 700;
      font-size: 1.5rem;
      background: linear-gradient(135deg, var(--electric-cyan), #60f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
    }

    .nav-link-custom {
      color: var(--text-body) !important;
      margin: 0 0.5rem;
      font-weight: 500;
      transition: color 0.2s;
    }

    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--electric-cyan) !important;
      border-bottom: 2px solid var(--electric-cyan);
    }

    /* 移动底部Tab */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: rgba(11, 14, 47, 0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.08);
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1040;
    }

    .mobile-tab {
      color: var(--text-muted);
      text-align: center;
      font-size: 0.7rem;
      text-decoration: none;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .mobile-tab i {
      font-size: 1.3rem;
      margin-bottom: 2px;
    }

    .mobile-tab.active {
      color: var(--electric-cyan);
    }

    /* Hero动态光点 */
    .hero-section {
      background: linear-gradient(180deg, #0B0E2F 0%, #1A1035 100%);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }

    .particle {
      position: absolute;
      width: 4px;
      height: 4px;
      background: var(--electric-cyan);
      border-radius: 50%;
      opacity: 0.5;
      animation: float 6s infinite ease-in-out;
    }

    .particle.amber {
      background: var(--warm-amber);
    }

    @keyframes float {
      0% { transform: translateY(0px) rotate(0deg); opacity: 0.3; }
      50% { transform: translateY(-30px) rotate(180deg); opacity: 0.8; }
      100% { transform: translateY(0px) rotate(360deg); opacity: 0.3; }
    }

    .abstract-sphere {
      width: 280px;
      height: 280px;
      background: radial-gradient(circle at 30% 30%, rgba(0,229,255,0.15), rgba(255,140,66,0.05));
      border-radius: 50%;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 0 40px rgba(0,229,255,0.3);
      animation: morph 8s infinite alternate;
      backdrop-filter: blur(12px);
    }

    @keyframes morph {
      0% { border-radius: 50% 50% 40% 60%; }
      100% { border-radius: 40% 60% 50% 50%; }
    }

    /* 功能卡片图标 */
    .feature-icon {
      width: 48px;
      height: 48px;
      color: var(--electric-cyan);
      margin-bottom: 1.5rem;
    }

    /* 定价高亮 */
    .pricing-highlight {
      border: 1.5px solid var(--electric-cyan);
      background: rgba(0,229,255,0.04);
    }

    .badge-amber {
      background: var(--warm-amber);
      color: white;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 0.8rem;
    }

    /* FAQ手风琴 */
    .accordion-button {
      background: rgba(255,255,255,0.03) !important;
      backdrop-filter: blur(12px);
      color: white !important;
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--radius-card) !important;
      font-weight: 500;
    }

    .accordion-button:not(.collapsed) {
      background: rgba(0,229,255,0.08) !important;
      color: var(--electric-cyan) !important;
      box-shadow: none;
    }

    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 1rem;
    }

    .footer-link {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-link:hover {
      color: var(--electric-cyan);
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.5rem;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .desktop-nav {
        display: none;
      }
      .abstract-sphere {
        width: 200px;
        height: 200px;
      }
    }

    @media (min-width: 769px) {
      .mobile-bottom-nav {
        display: none;
      }
    }

    section {
      padding: 100px 0;
    }