/* roulang page: index */
:root {
      --primary: #1E5FD9;
      --primary-hover: #1647A8;
      --data-cyan: #0EA5E9;
      --comp-purple: #7C3AED;
      --alert-orange: #F59E0B;
      --bg-page: #FFFFFF;
      --bg-light: #F8FAFC;
      --bg-cta: #F0F6FF;
      --text-body: #334155;
      --text-weak: #64748B;
      --text-strong: #1E293B;
      --border: #E2E8F0;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --max-width: 1200px;
      --header-height: 72px;
      --transition: 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-sm);
      padding: 12px 24px;
      font-weight: 500;
      transition: all var(--transition);
      border: none;
      background: none;
      text-decoration: none;
      font-size: 16px;
      letter-spacing: 0.3px;
    }
    
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      font-weight: 600;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 8px 16px rgba(30,95,217,0.2);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      font-weight: 500;
    }
    .btn-outline:hover {
      background-color: #F0F6FF;
      border-color: var(--primary-hover);
      color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(30,95,217,0.08);
    }
    
    .btn-white {
      background: #ffffff;
      color: var(--primary);
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .btn-white:hover {
      background: #f1f5f9;
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(0,0,0,0.08);
    }
    
    h1, h2, h3 {
      color: var(--text-strong);
      font-weight: 600;
    }
    h1 {
      font-size: 2.5rem;
      line-height: 1.3;
      font-weight: 700;
    }
    h2 {
      font-size: 2rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    
    /* Header & Navigation */
    #header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      z-index: 100;
      border-bottom: 1px solid var(--border);
      height: var(--header-height);
      display: flex;
      align-items: center;
      transition: box-shadow var(--transition);
    }
    #header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--data-cyan);
    }
    .domain-badge {
      font-size: 0.7rem;
      color: var(--text-weak);
      font-weight: 400;
      margin-left: 4px;
      opacity: 0.7;
    }
    nav {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
    }
    .nav-link {
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
      font-size: 1rem;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-strong);
    }
    
    /* Hero */
    #hero {
      padding: 32px 0 60px;
      background: linear-gradient(105deg, #ffffff 0%, #f4f9ff 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 45%;
    }
    .hero-text h1 {
      margin-bottom: 20px;
      color: #0B1E33;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-weak);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1 1 50%;
      background: linear-gradient(135deg, #0F2B5C 0%, #1E5FD9 90%);
      border-radius: 28px;
      padding: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      min-height: 340px;
      background-image: url('/assets/images/backpic/backgaben-1.webp');
      background-size: cover;
      background-position: center;
    }
    .dashboard-mock {
      width: 100%;
      border-radius: 20px;
      opacity: 0.95;
    }
    
    /* Sections */
    section {
      padding: 80px 0;
    }
    .bg-light {
      background-color: var(--bg-light);
    }
    .section-title {
      text-align: left;
      margin-bottom: 48px;
    }
    .section-title.center {
      text-align: center;
    }
    
    /* Metrics */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: #fff;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
      text-align: left;
    }
    .metric-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-3px);
    }
    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 8px;
    }
    .metric-label {
      color: var(--text-weak);
      font-size: 0.95rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    /* Services */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #fff;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-6px);
    }
    .service-top-bar {
      height: 8px;
      width: 100%;
    }
    .service-body {
      padding: 28px 24px 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .service-link {
      margin-top: 16px;
      font-weight: 600;
      color: var(--primary);
      align-self: flex-start;
      display: inline-flex;
      align-items: center;
    }
    
    /* Compare */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      max-width: 900px;
      margin: 0 auto;
    }
    .compare-box {
      border-radius: 20px;
      padding: 32px;
    }
    .compare-box.left {
      background: #F1F5F9;
    }
    .compare-box.right {
      background: #EAF2FF;
      border: 1px solid rgba(30,95,217,0.15);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 16px 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 18px 8px;
      font-size: 1.1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-strong);
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 8px 20px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
      background: #F8FAFC;
      border-radius: 0 0 12px 12px;
    }
    
    /* Contact */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
      align-items: center;
    }
    .form-group input, .form-group textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #CBD5E1;
      border-radius: 6px;
      font-family: inherit;
      transition: all var(--transition);
      background: #fff;
    }
    .form-group input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(30,95,217,0.2);
    }
    
    /* Footer */
    #footer {
      background: #1a2233;
      color: #CBD5E1;
      padding: 56px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 32px;
    }
    
    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      .menu-toggle { display: block; }
      nav { display: none; position: absolute; top: var(--header-height); left: 0; width: 100%; background: white; flex-direction: column; padding: 24px; box-shadow: 0 8px 20px rgba(0,0,0,0.08); }
      nav.open { display: flex; }
      .hero-grid { flex-direction: column; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }