/* roulang page: index */
:root {
      --primary: #0F172A;
      --secondary: #38BDF8;
      --accent: #F59E0B;
      --bg-light: #F8FAFC;
      --bg-dark: #1E293B;
      --card-bg: #FFFFFF;
      --text-primary: #0F172A;
      --text-secondary: #475569;
      --text-light: #CBD5E1;
      --text-on-dark: #F1F5F9;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.08);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --transition: 0.2s ease;
      --font-sans: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.25;
    }

    h1 {
      font-size: clamp(2.25rem, 5vw, 3.5rem);
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: clamp(2rem, 4vw, 2.5rem);
      margin-bottom: 0.75rem;
    }

    h3 {
      font-size: 1.5rem;
    }

    p {
      color: var(--text-secondary);
      font-size: 1rem;
      line-height: 1.7;
    }

    a {
      color: var(--secondary);
      text-decoration: none;
      transition: all var(--transition);
    }

    a:hover {
      text-decoration: underline;
      color: #0EA5E9;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 500;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-size: 1rem;
      line-height: 1.2;
    }

    .btn-primary {
      background-color: var(--secondary);
      color: white;
      box-shadow: 0 2px 8px rgba(56, 189, 248, 0.25);
    }

    .btn-primary:hover {
      background-color: #0EA5E9;
      transform: scale(1.02);
      box-shadow: 0 8px 20px rgba(14, 165, 233, 0.35);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #0F172A;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
    }

    .btn-accent:hover {
      background-color: #FBBF24;
      transform: scale(1.02);
      box-shadow: 0 8px 22px rgba(251, 191, 36, 0.45);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
    }

    .btn-outline:hover {
      background-color: var(--secondary);
      color: white;
      border-color: var(--secondary);
    }

    /* 导航样式 - 资讯门户吸顶 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 10px rgba(0,0,0,0.02);
    }

    .header-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .logo-text span {
      color: var(--secondary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-primary);
    }

    .nav-links a {
      color: var(--text-primary);
      font-size: 0.95rem;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: border-color 0.2s;
    }

    .nav-links a:hover {
      color: var(--secondary);
      border-bottom-color: var(--secondary);
      text-decoration: none;
    }

    .mobile-menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .mobile-menu-toggle span {
      display: block;
      width: 25px;
      height: 2px;
      background: var(--primary);
      transition: 0.2s;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: white;
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: radial-gradient(circle at 20% 50%, rgba(56,189,248,0.08) 0%, transparent 35%);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-content .lead {
      font-size: 1.2rem;
      color: #CBD5E1;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .hero-visual {
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-lg);
      padding: 20px;
      backdrop-filter: blur(8px);
      display: flex;
      justify-content: center;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero {
        padding: 120px 0 70px;
      }
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    /* stats 深色区 */
    .stats-section {
      background-color: var(--bg-dark);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-md);
      padding: 28px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 8px;
    }
    .stat-label {
      color: #CBD5E1;
      font-size: 0.95rem;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }

    /* services 卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--secondary);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--secondary);
      margin-bottom: 20px;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* compare */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.recommend {
      border: 2px solid var(--secondary);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: #0F172A;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    .vs {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-secondary);
    }
    @media (max-width: 768px) {
      .compare-container {
        grid-template-columns: 1fr;
      }
      .vs {
        text-align: center;
      }
    }

    /* faq */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
    }

    /* cta */
    .cta-section {
      background: var(--bg-dark);
      color: white;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-sm);
      border: 1px solid #334155;
      background: #1E293B;
      color: white;
      margin-bottom: 16px;
    }
    .cta-form input:focus {
      border-color: var(--secondary);
      outline: none;
    }
    @media (max-width: 768px) {
      .cta-grid {
        grid-template-columns: 1fr;
      }
    }

    footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }