/* roulang page: index */
:root {
      --primary-cyan: #0AEFFF;
      --primary-cyan-dark: #00C2D1;
      --deep-purple: #1A0A2E;
      --bg-light: #F8FAFC;
      --surface-white: #FFFFFF;
      --accent-orange: #FF6B35;
      --text-main: #334155;
      --text-muted: #64748B;
      --text-on-dark: #E2E8F0;
      --border-light: rgba(26,10,46,0.08);
      --radius-lg: 16px;
      --radius-pill: 40px;
      --shadow-card: 0 4px 20px rgba(26,10,46,0.06), 0 1px 3px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 10px 30px rgba(26,10,46,0.12), 0 4px 8px rgba(0,0,0,0.06);
      --transition-basic: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-basic);
    }
    /* 悬浮胶囊导航 */
    .nav-capsule {
      background: rgba(26, 10, 46, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-pill);
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 20px rgba(0,0,0,0.25);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .nav-capsule .logo-text {
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #0AEFFF 0%, #00C2D1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-link {
      color: #FFFFFF;
      margin: 0 12px;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary-cyan);
      border-radius: 3px;
    }
    .nav-link:hover {
      color: var(--primary-cyan);
    }
    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #0AEFFF 0%, #00C2D1 100%);
      color: white;
      font-weight: 600;
      border-radius: 30px;
      padding: 12px 32px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-basic);
      box-shadow: 0 4px 12px rgba(10,239,255,0.4);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 6px 18px rgba(10,239,255,0.6);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      border-radius: 30px;
      padding: 12px 32px;
      transition: var(--transition-basic);
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: rgba(10,239,255,0.08);
    }
    .btn-cta {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      border-radius: 30px;
      padding: 16px 40px;
      font-size: 1.125rem;
      box-shadow: 0 8px 18px rgba(255,107,53,0.4);
      animation: pulse-orange 2s infinite;
      border: none;
      cursor: pointer;
      transition: var(--transition-basic);
    }
    .btn-cta:hover {
      background: #ff7f4f;
      box-shadow: 0 10px 22px rgba(255,107,53,0.6);
      transform: scale(1.02);
    }
    @keyframes pulse-orange {
      0% { box-shadow: 0 0 0 0 rgba(255,107,53,0.5); }
      70% { box-shadow: 0 0 0 12px rgba(255,107,53,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,107,53,0); }
    }
    .card {
      background: var(--surface-white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 28px;
      transition: var(--transition-basic);
      border: 1px solid var(--border-light);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    /* 功能矩阵右侧图片切换 */
    .feature-visual {
      transition: opacity 0.35s ease, transform 0.3s ease;
    }
    .scenario-scroll {
      scrollbar-width: thin;
      scrollbar-color: var(--primary-cyan) #EDF2F7;
    }
    .scenario-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .scenario-scroll::-webkit-scrollbar-thumb {
      background: var(--primary-cyan);
      border-radius: 10px;
    }
    .faq-item {
      border-left: 4px solid var(--primary-cyan);
      background: var(--surface-white);
      border-radius: 12px;
      transition: background 0.2s;
    }
    .faq-item[open] {
      background: #F1F5F9;
    }
    .footer-link:hover {
      color: var(--primary-cyan);
    }
    @media (max-width: 640px) {
      .nav-capsule {
        position: fixed;
        bottom: 16px;
        left: 16px;
        right: 16px;
        width: auto;
        border-radius: 40px;
        background: rgba(26,10,46,0.95);
        justify-content: space-around;
        padding: 12px 16px;
        z-index: 50;
      }
      .nav-capsule .logo-text {
        font-size: 1.2rem;
      }
      .desktop-nav-links {
        display: none;
      }
      .mobile-nav-icons {
        display: flex;
        gap: 24px;
        color: white;
        font-size: 1.3rem;
      }
      .mobile-nav-icons i {
        transition: 0.2s;
      }
      .mobile-nav-icons i:hover {
        color: var(--primary-cyan);
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 30px !important;
      }
    }
    @media (min-width: 641px) {
      .mobile-nav-icons {
        display: none;
      }
      .desktop-nav-links {
        display: flex;
        align-items: center;
      }
    }