/* roulang page: index */
:root {
      --primary-blue: #1B5E8A;
      --aux-green: #2E8B57;
      --accent-orange: #E85D3F;
      --bg-light: #F7F9FC;
      --card-white: #FFFFFF;
      --text-dark: #2C3E50;
      --text-muted: #6B7C93;
      --border-light: #E1E8F0;
      --footer-bg: #1A2D3F;
      --shadow-sm: 0 2px 12px rgba(27, 94, 138, 0.08);
      --shadow-hover: 0 8px 24px rgba(27, 94, 138, 0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-data: "DIN Alternate", "PingFang SC", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      transition: var(--transition);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      height: 64px;
      z-index: 100;
      transition: box-shadow 0.2s;
    }
    .site-header.shadow {
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary-blue);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      width: 24px;
      height: 24px;
      background: var(--primary-blue);
      mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><circle cx="12" cy="12" r="10" fill="none" stroke="white" stroke-width="2"/><path d="M12 2C8 6 8 18 12 22C16 18 16 6 12 2Z" fill="white"/></svg>');
      mask-size: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--primary-blue);
      border-bottom-color: var(--primary-blue);
    }
    .btn-nav {
      background: var(--primary-blue);
      color: #fff !important;
      padding: 8px 20px !important;
      border-radius: 20px;
      font-weight: 600;
      border: none !important;
    }
    .btn-nav:hover {
      background: #154a6b;
      color: #fff;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text-dark);
    }
    /* 移动端导航抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: #fff;
      box-shadow: -5px 0 20px rgba(0,0,0,0.1);
      z-index: 200;
      transition: right 0.3s ease;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .mobile-drawer.open {
      right: 0;
    }
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      font-size: 28px;
    }
    .drawer-links a {
      display: block;
      padding: 12px 0;
      font-size: 18px;
      border-bottom: 1px solid var(--border-light);
      color: var(--text-dark);
    }
    /* 版块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .nav-links { display: none; }
      .menu-toggle { display: block; }
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-subtitle {
      font-size: 20px;
      color: var(--text-muted);
      margin-bottom: 48px;
      text-align: center;
    }
    /* 按钮 */
    .btn-primary {
      background: var(--aux-green);
      color: #fff;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #236B43;
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(46,139,87,0.3);
    }
    .btn-accent {
      background: var(--accent-orange);
      color: #fff;
      border: none;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
    }
    .btn-accent:hover {
      background: #C94A2F;
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(232,93,63,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: #E8F2F9;
    }
    /* Hero */
    .hero {
      background-color: var(--bg-light);
      position: relative;
      display: flex;
      align-items: center;
      min-height: 85vh;
      padding-top: 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
      color: var(--text-dark);
    }
    .hero-visual {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      height: 360px;
      opacity: 0.9;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 36px;
      }
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 40px;
      font-weight: 700;
      color: var(--aux-green);
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    /* 对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .compare-card {
      padding: 32px;
      border-radius: var(--radius-card);
    }
    .compare-left {
      background: #f0f3f7;
    }
    .compare-right {
      background: #fff;
      border: 1px solid var(--primary-blue);
    }
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-item {
      background: #EDF3F8;
      padding: 32px;
      border-radius: var(--radius-card);
    }
    /* FAQ */
    .faq-item {
      background: #fff;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      padding: 20px 24px;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
    }
    /* 表单 */
    .contact-form {
      max-width: 560px;
      margin: 0 auto;
      background: #fff;
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .contact-form input {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      margin-bottom: 16px;
      font-size: 16px;
    }
    .contact-form input:focus {
      outline: none;
      border-color: var(--primary-blue);
    }
    .footer {
      background: var(--footer-bg);
      color: #ddd;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
    }
    .copyright {
      text-align: center;
      margin-top: 32px;
      color: #aaa;
    }
    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 768px) {
      .dashboard-grid { grid-template-columns: 1fr 1fr; }
      .services-grid, .cases-grid, .compare-row, .footer-grid { grid-template-columns: 1fr; }
    }