/* roulang page: index */
:root {
      --primary: #0A66C2;
      --primary-light: #e6f0fa;
      --accent: #F5A623;
      --accent-deep: #d4891a;
      --dark: #1A1A2E;
      --gray-bg: #F7F9FC;
      --white: #FFFFFF;
      --border: #E2E8F0;
      --success: #10B981;
      --fail: #EF4444;
      --text-muted: #64748B;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-mono: "DIN Alternate", "Roboto Mono", "Menlo", monospace;
      --transition: 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.6;
      color: var(--dark);
      background-color: var(--gray-bg);
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    ul {
      list-style: none;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--white);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border);
      transition: box-shadow 0.3s;
    }

    #header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--dark);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      color: var(--primary);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--dark);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-links a.active {
      color: var(--primary);
    }

    .btn-cta-nav {
      background: var(--accent);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }

    .btn-cta-nav:hover {
      background: #d4891a;
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--dark);
      cursor: pointer;
    }

    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      border-bottom: 1px solid var(--border);
      flex-direction: column;
      padding: 20px;
      z-index: 999;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }

    .mobile-menu a {
      padding: 12px 0;
      font-weight: 500;
      border-bottom: 1px solid var(--border);
      display: block;
    }

    .mobile-menu .btn-cta-nav {
      margin-top: 10px;
      text-align: center;
      background: var(--accent);
      border-radius: var(--radius-btn);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      text-align: center;
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--dark);
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
    }

    .section-title::after {
      content: "";
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin: 12px auto 0;
      border-radius: 2px;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 18px;
    }

    /* Hero */
    #hero {
      background: var(--gray-bg);
      padding: 40px 0 80px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 42px;
      line-height: 1.3;
      font-weight: 700;
      color: var(--dark);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-left .sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #09549e;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }

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

    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 0 0 rgba(245, 166, 35, 0.5);
      animation: pulse 2s infinite;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
    }

    .btn-accent:hover {
      background: #d4891a;
      animation: none;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(245, 166, 35, 0.6); }
      70% { box-shadow: 0 0 0 12px rgba(245, 166, 35, 0); }
      100% { box-shadow: 0 0 0 0 rgba(245, 166, 35, 0); }
    }

    .hero-right {
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      min-height: 380px;
      display: flex;
      align-items: flex-end;
      justify-content: center;
      overflow: hidden;
    }

    .hero-data-card {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      padding: 20px 28px;
      border-radius: 16px;
      margin: 20px;
      display: flex;
      gap: 32px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    }

    .hero-stat h3 {
      font-family: var(--font-mono);
      font-size: 32px;
      color: var(--accent);
    }

    /* 数据看板 */
    #metrics {
      background: linear-gradient(180deg, #F0F6FF 0%, #FFFFFF 100%);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: white;
      padding: 32px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 38px;
      font-weight: 700;
      color: var(--accent);
      margin: 12px 0 8px;
    }

    .metric-icon {
      font-size: 32px;
      color: var(--primary);
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      width: 64px;
      height: 64px;
      background: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 14px;
      color: white;
      font-size: 28px;
      margin-bottom: 20px;
      transition: background 0.3s;
    }

    .service-card:hover .service-icon {
      background: var(--accent);
    }

    .service-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
    }

    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .compare-card.traditional {
      border-top: 4px solid var(--fail);
    }

    .compare-card.longzhu {
      border-top: 4px solid var(--success);
      border-left: 5px solid var(--primary);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      cursor: pointer;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-content {
      padding: 20px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
      transition: background 0.2s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F7F9FC;
      padding: 0 24px;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }

    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .trust-badges {
      display: flex;
      gap: 20px;
      margin-top: 24px;
    }

    .badge {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--primary);
    }

    .contact-form input,
    .contact-form textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-btn);
      margin-bottom: 16px;
      transition: border 0.2s;
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,102,194,0.1);
    }

    /* Footer */
    footer {
      background: var(--dark);
      color: white;
      padding: 60px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 2fr;
      gap: 30px;
    }

    .footer-col h5 {
      color: var(--primary);
      margin-bottom: 16px;
      font-size: 18px;
    }

    .copyright {
      background: #0F0F23;
      text-align: center;
      padding: 20px;
      color: #94A3B8;
      margin-top: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .contact-grid, .compare-grid {
        grid-template-columns: 1fr;
      }
      .services-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      #header { height: 60px; }
      .mobile-menu.active { display: flex; }
      .services-grid, .cases-grid, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }