/* roulang page: index */
:root {
      --primary: #0A4DA4;
      --primary-dark: #083b7a;
      --accent-cyan: #00C9A7;
      --accent-orange: #F5A623;
      --accent-orange-hover: #E09510;
      --bg-light: #F7F9FC;
      --card-white: #FFFFFF;
      --dark-bg: #0B1E3D;
      --text-primary: #1A1A1A;
      --text-secondary: #5A6B7F;
      --text-on-dark: #FFFFFF;
      --border-light: #D0D7E2;
      --shadow-sm: 0 2px 12px rgba(10, 77, 164, 0.08);
      --shadow-md: 0 8px 24px rgba(10, 77, 164, 0.15);
      --shadow-lg: 0 16px 32px rgba(10, 77, 164, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
      --container-max: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-light);
      letter-spacing: 0.3px;
      -webkit-font-smoothing: antialiased;
    }

    .inter-font {
      font-family: 'Inter', 'Roboto', sans-serif;
    }

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

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

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      font-size: 16px;
      padding: 14px 32px;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent-orange);
      color: white;
      box-shadow: 0 4px 12px rgba(245, 166, 35, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--accent-orange-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 20px rgba(245, 166, 35, 0.4);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
    }
    .btn-secondary:hover {
      background-color: rgba(10, 77, 164, 0.08);
      transform: translateY(-2px);
    }
    .btn-submit {
      background-color: var(--accent-cyan);
      color: white;
      width: 100%;
      font-weight: 600;
    }
    .btn-submit:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 18px rgba(0, 201, 167, 0.35);
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(12px);
      z-index: 1000;
      transition: box-shadow 0.3s ease, background 0.3s ease;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
    }
    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
      border-bottom: 1px solid rgba(10, 77, 164, 0.08);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo i {
      font-size: 28px;
      color: var(--accent-cyan);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      color: var(--text-primary);
      font-weight: 500;
      font-size: 15px;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-menu a:hover {
      color: var(--primary);
      border-bottom-color: var(--accent-cyan);
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      font-size: 28px;
      cursor: pointer;
      color: var(--primary);
    }
    #menu-toggle {
      display: none;
    }
    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(10, 77, 164, 0.78) 0%, rgba(11, 30, 61, 0.85) 100%), 
                  url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      padding-top: var(--nav-height);
      color: white;
      position: relative;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-right {
      flex: 0 0 300px;
      display: flex;
      justify-content: flex-end;
      margin-top: 40px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -1px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .floating-stats {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      padding: 24px 28px;
      display: flex;
      flex-direction: column;
      gap: 18px;
      border: 1px solid rgba(255,255,255,0.25);
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 14px;
      opacity: 0.85;
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.25;
      color: var(--text-primary);
    }
    .section-title p {
      color: var(--text-secondary);
      margin-top: 12px;
      font-size: 17px;
    }

    /* 指标看板 */
    .indicators-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .indicator-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .indicator-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .indicator-icon {
      font-size: 36px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .big-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    /* 服务矩阵 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card.featured {
      grid-row: span 1;
      transform: scale(1.02);
      box-shadow: var(--shadow-md);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .service-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .service-body {
      padding: 24px;
    }
    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .text-link {
      color: var(--accent-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 12px;
    }

    /* 对比区 */
    .comparison-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-card {
      border-radius: var(--radius-card);
      padding: 36px;
      color: white;
    }
    .compare-left {
      background: #2d3a4a;
    }
    .compare-right {
      background: var(--primary);
      border: 1px solid rgba(255,255,255,0.2);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin: 20px 0;
      font-weight: 500;
    }

    /* 案例轮播 */
    .case-carousel {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
    }
    .case-card {
      flex: 0 0 380px;
      scroll-snap-align: start;
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-card img {
      height: 200px;
      object-fit: cover;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* CTA */
    .cta-section {
      background: var(--dark-bg);
      color: white;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-form input, .cta-form select {
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-input);
      border: 1px solid var(--border-light);
      margin-bottom: 16px;
    }

    /* 页脚 */
    .footer {
      background: #0B1E3D;
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .indicators-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 32px; }
      .comparison-row, .cta-grid, .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }