/* roulang page: index */
:root {
      --primary: #2563EB;
      --primary-hover: #1D4ED8;
      --primary-light: #EFF6FF;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-primary: #0F172A;
      --text-secondary: #475569;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --radius: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.1), 0 4px 10px -2px rgba(0,0,0,0.05);
      --font-title: 'Noto Sans SC', 'Inter', system-ui, sans-serif;
      --font-body: 'Noto Sans SC', 'Inter', system-ui, sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition: 0.25s ease;
      --header-height: 70px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg);
      margin: 0;
      padding-top: var(--header-height);
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      letter-spacing: -0.01em;
    }
    h1 {
      font-weight: 700;
      font-size: 2.8rem;
      line-height: 1.25;
      color: var(--text-primary);
    }
    h2 {
      font-weight: 700;
      font-size: 2.2rem;
      margin-bottom: 1rem;
      color: var(--text-primary);
    }
    h3 {
      font-weight: 600;
      font-size: 1.2rem;
      color: var(--text-primary);
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-hover);
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      font-family: var(--font-body);
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .navbar {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border);
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1030;
      height: var(--header-height);
      padding: 0 20px;
    }
    .navbar-brand {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .navbar-brand i {
      color: var(--accent);
      font-size: 1.5rem;
    }
    .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      position: relative;
      padding: 0.5rem 1rem;
      transition: var(--transition);
    }
    .nav-link:hover {
      color: var(--primary) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 1rem;
      right: 1rem;
      height: 2px;
      background: var(--accent);
      transform: scaleX(0);
      transition: transform 0.25s ease;
    }
    .nav-link:hover::after {
      transform: scaleX(1);
    }
    .search-toggle {
      background: none;
      border: none;
      color: var(--text-secondary);
      font-size: 1.2rem;
      padding: 0.5rem;
    }
    .search-toggle:hover {
      color: var(--primary);
    }
    .btn-login {
      color: var(--text-primary);
      font-weight: 600;
      border: none;
      background: transparent;
      padding: 0.5rem 1rem;
      transition: var(--transition);
    }
    .btn-login:hover {
      color: var(--primary);
    }
    .btn-primary-custom {
      background: var(--primary);
      color: white;
      font-weight: 600;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .btn-primary-custom:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: var(--shadow-md);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary-light);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      font-weight: 700;
      border: none;
      padding: 12px 28px;
      border-radius: 20px;
      transition: var(--transition);
      font-size: 0.95rem;
      box-shadow: 0 4px 8px rgba(249,115,22,0.25);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 8px 16px rgba(249,115,22,0.3);
      color: white;
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }
    /* Hero */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      border-radius: 0 0 30px 30px;
      overflow: hidden;
    }
    .hero-overlay {
      background: rgba(248,250,252,0.88);
      backdrop-filter: blur(2px);
      padding: 60px 0;
    }
    .hero-image {
      border-radius: 16px;
      box-shadow: 0 25px 50px -10px rgba(0,0,0,0.2);
      width: 100%;
      height: auto;
    }
    /* 卡片规范 */
    .card-custom {
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      border: none;
      transition: var(--transition);
      padding: 24px;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    /* 功能网格不对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    .features-grid .feature-large {
      grid-row: span 2;
    }
    @media (max-width: 992px) {
      .features-grid {
        grid-template-columns: 1fr 1fr;
      }
      .features-grid .feature-large {
        grid-row: span 1;
      }
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    .icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 16px;
    }
    /* 场景图文交替 */
    .scene-block {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 60px;
    }
    .scene-block.reverse {
      flex-direction: row-reverse;
    }
    .scene-text, .scene-img {
      flex: 1;
    }
    .scene-img img {
      border-radius: 16px;
      box-shadow: var(--shadow-md);
      width: 100%;
    }
    @media (max-width: 768px) {
      .scene-block, .scene-block.reverse {
        flex-direction: column;
      }
    }
    /* Pricing 高亮 */
    .pricing-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      padding: 32px 24px;
      border: 1px solid var(--border);
      transition: var(--transition);
      position: relative;
    }
    .pricing-card.recommended {
      transform: translateY(-12px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .badge-accent {
      background: var(--accent);
      color: white;
      font-weight: 600;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price-number {
      font-family: var(--font-mono);
      font-weight: 600;
      font-size: 2.5rem;
      color: var(--text-primary);
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #F1F5F9;
      color: var(--text-primary);
      font-weight: 600;
      border-color: var(--primary);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(37,99,235,0.2);
    }
    .accordion-item {
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      border: 1px solid var(--border);
    }
    /* CTA 条 */
    .cta-strip {
      background: #EFF6FF;
      border-radius: 16px;
      padding: 48px;
      text-align: center;
    }
    /* Footer */
    .footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer h5 {
      color: #FFFFFF;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .footer a {
      color: #CBD5E1;
      text-decoration: none;
    }
    .footer a:hover {
      color: #FFFFFF;
    }
    .copyright {
      color: #64748B;
      border-top: 1px solid #334155;
      margin-top: 40px;
      padding-top: 20px;
      font-size: 0.9rem;
    }
    /* 其它 */
    .stat-number {
      font-family: var(--font-mono);
      font-weight: 600;
    }