/* roulang page: index */
:root {
      --primary: #1A2B4C;
      --primary-light: #253A5E;
      --accent: #E85D04;
      --accent-hover: #D44F00;
      --sky: #0EA5E9;
      --bg-light: #F4F6F9;
      --bg-white: #FFFFFF;
      --bg-faq: #F8FAFC;
      --text: #1E293B;
      --text-secondary: #64748B;
      --success: #10B981;
      --border: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--nav-height);
    }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.75;
      color: var(--text);
      background-color: var(--bg-white);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 0 var(--border);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: #475569;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: background 0.2s;
    }
    .nav-cta:hover {
      background: var(--primary-light);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta.desktop {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        padding: 20px 24px;
        gap: 16px;
        z-index: 999;
      }
      .mobile-menu a {
        font-size: 18px;
        font-weight: 500;
        color: var(--text);
        padding: 8px 0;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(105deg, #F4F6F9 0%, #E9EFF5 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 42%;
    }
    .hero-right {
      flex: 1;
    }
    .hero h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      letter-spacing: 0.5px;
      transition: background 0.2s, box-shadow 0.25s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(232, 93, 4, 0.3);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: background 0.2s;
    }
    .btn-secondary:hover {
      background: rgba(26,43,76,0.05);
    }
    .hero-img {
      width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-hover);
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    @media (max-width: 992px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
        text-align: center;
      }
      .hero-actions {
        justify-content: center;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 48px;
      text-align: center;
    }
    /* 亮点网格 不对称 */
    .highlights-bg {
      background: var(--bg-white);
    }
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: white;
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-card.tall {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .icon-orange {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text);
    }
    .highlight-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    @media (max-width: 992px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .highlight-card.tall {
        grid-row: span 1;
      }
    }
    @media (max-width: 520px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务瀑布 */
    .services-bg {
      background: var(--bg-light);
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .service-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      overflow: hidden;
      transition: transform 0.25s, box-shadow 0.25s;
      border: 1px solid #E2E8F0;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      width: 100%;
      height: auto;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .service-content {
      padding: 20px;
    }
    .service-content h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-tag {
      display: inline-block;
      background: #E0F2FE;
      color: #0369A1;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      margin-top: 12px;
    }
    @media (max-width: 992px) {
      .masonry {
        columns: 2;
      }
    }
    @media (max-width: 520px) {
      .masonry {
        columns: 1;
      }
    }
    /* 方案对比 */
    .compare-bg {
      background: var(--bg-white);
    }
    .compare-table {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
      max-width: 900px;
      margin: 0 auto;
    }
    .plan-card {
      flex: 1 1 280px;
      background: white;
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
    }
    .plan-header {
      background: var(--primary);
      color: white;
      padding: 20px;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
      margin: -32px -24px 24px;
      text-align: center;
      font-weight: 700;
      font-size: 22px;
    }
    .plan-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid #f1f5f9;
    }
    .check {
      color: var(--success);
      font-weight: 700;
    }
    .cross {
      color: #CBD5E1;
    }
    .compare-cta {
      text-align: center;
      margin-top: 32px;
    }
    /* 信任数据 */
    .trust-bg {
      background: #F8FAFC;
    }
    .stats-row {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 14px;
    }
    .logo-wall {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      filter: grayscale(1);
      opacity: 0.7;
    }
    .logo-wall img {
      height: 40px;
      width: auto;
    }
    /* FAQ */
    .faq-bg {
      background: var(--bg-faq);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px 24px;
      cursor: pointer;
      border: 1px solid #E2E8F0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA 横幅 */
    .cta-band {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }
    .cta-band h2 {
      font-size: 28px;
      margin-bottom: 16px;
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      transition: all 0.25s;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary);
    }
    /* 页脚 */
    .footer {
      background: #0F1A2E;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: #94A3B8;
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid #334155;
      text-align: center;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }