/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0B365D;
      --accent: #00A896;
      --accent-hover: #028f80;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B192C;
      --text-main: #1E293B;
      --text-muted: #475569;
      --text-light: #F1F5F9;
      --border-color: #E2E8F0;
      --border-dark: #1E3A5F;
      --shadow-sm: 0 2px 4px rgba(15, 76, 129, 0.05);
      --shadow-md: 0 12px 24px -4px rgba(15, 76, 129, 0.08);
      --radius: 6px;
      --transition: all 0.25s ease-in-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, "SF Pro SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .top-bar {
      background-color: #081D33;
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 38px;
    }
    .top-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 6px #10B981;
    }
    .top-info {
      display: flex;
      gap: 20px;
    }
    .site-header {
      background: var(--bg-white);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }
    .brand-badge {
      font-size: 11px;
      background: #E0F2FE;
      color: var(--primary);
      padding: 2px 6px;
      border-radius: 4px;
      font-weight: 600;
    }
    .main-nav {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-btn {
      background-color: var(--accent);
      color: #fff;
      font-weight: 600;
      padding: 9px 20px;
      border-radius: var(--radius);
      display: inline-block;
      box-shadow: 0 2px 4px rgba(0, 168, 150, 0.2);
    }
    .nav-btn:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .hero-section {
      background: linear-gradient(rgba(11, 25, 44, 0.88), rgba(11, 25, 44, 0.94)), url('/assets/images/0d881af8072feb1a.jpg') center/cover no-repeat;
      color: #fff;
      padding: 85px 0 70px;
      border-bottom: 4px solid var(--accent);
    }
    .hero-content {
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-tag {
      display: inline-block;
      background: rgba(0, 168, 150, 0.2);
      border: 1px solid var(--accent);
      color: #5EEAD4;
      font-size: 13px;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 40px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      font-size: 16px;
      color: #CBD5E1;
      margin-bottom: 35px;
      line-height: 1.8;
      text-align: justify;
      text-align-last: center;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 45px;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #fff;
      padding: 13px 30px;
      font-size: 16px;
      font-weight: 600;
      border-radius: var(--radius);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.3);
      color: #fff;
      padding: 13px 28px;
      font-size: 16px;
      font-weight: 600;
      border-radius: var(--radius);
      backdrop-filter: blur(4px);
    }
    .btn-secondary:hover {
      background: rgba(255,255,255,0.2);
    }
    .hero-metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: rgba(15, 30, 50, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius);
      padding: 24px;
      backdrop-filter: blur(8px);
    }
    .hero-metric-item {
      border-right: 1px solid rgba(255,255,255,0.1);
      padding: 0 10px;
    }
    .hero-metric-item:last-child {
      border-right: none;
    }
    .hero-metric-val {
      font-size: 28px;
      font-weight: 700;
      color: #5EEAD4;
      line-height: 1.2;
    }
    .hero-metric-lbl {
      font-size: 13px;
      color: #94A3B8;
      margin-top: 6px;
    }
    .section-block {
      padding: 75px 0;
    }
    .section-alt {
      background-color: #F1F5F9;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-light);
      padding: 85px 0;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }
    .section-header h2 {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      position: relative;
      display: inline-block;
    }
    .section-dark .section-header h2 {
      color: #fff;
    }
    .section-header h2::after {
      content: "";
      display: block;
      width: 48px;
      height: 3px;
      background: var(--accent);
      margin: 10px auto 0;
    }
    .section-header p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-header p {
      color: #94A3B8;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 24px;
      transition: var(--transition);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
      border-color: #CBD5E1;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      background: #E0F2FE;
      color: var(--primary);
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 18px;
      font-weight: bold;
    }
    .feature-card h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: var(--primary);
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      background: #fff;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }
    .spec-table th, .spec-table td {
      padding: 14px 18px;
      font-size: 14px;
      border-bottom: 1px solid var(--border-color);
      text-align: left;
    }
    .spec-table th {
      background-color: #F8FAFC;
      color: var(--primary);
      font-weight: 600;
    }
    .product-tier {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px 26px;
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .product-tier.featured {
      border: 2px solid var(--accent);
      box-shadow: var(--shadow-md);
    }
    .product-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--accent);
      color: #fff;
      font-size: 12px;
      font-weight: 600;
      padding: 2px 10px;
      border-radius: 12px;
    }
    .product-tier h3 {
      font-size: 20px;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .tier-desc {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 20px;
      min-height: 42px;
    }
    .tier-specs {
      margin-bottom: 24px;
      flex-grow: 1;
    }
    .tier-specs li {
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .tier-specs li span {
      color: var(--accent);
      font-weight: bold;
    }
    .step-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-num {
      font-size: 32px;
      font-weight: 800;
      color: #E2E8F0;
      position: absolute;
      top: 14px;
      right: 18px;
      line-height: 1;
    }
    .step-item h4 {
      font-size: 17px;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .news-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-img {
      height: 170px;
      overflow: hidden;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .news-card:hover .news-img img {
      transform: scale(1.04);
    }
    .news-body {
      padding: 20px;
      flex-grow: 1;
    }
    .news-meta {
      font-size: 12px;
      color: #94A3B8;
      margin-bottom: 8px;
      display: flex;
      justify-content: space-between;
    }
    .news-body h4 {
      font-size: 16px;
      margin-bottom: 10px;
      color: var(--text-main);
      line-height: 1.4;
    }
    .news-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
    }
    .partner-box {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 16px;
      text-align: center;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 64px;
    }
    .inquiry-form-card {
      background: #fff;
      border-radius: var(--radius);
      padding: 36px 30px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      max-width: 780px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0, 168, 150, 0.15);
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .btn-submit {
      width: 100%;
      background: var(--accent);
      color: #fff;
      font-size: 16px;
      font-weight: 600;
      padding: 13px;
      border-radius: var(--radius);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      margin-top: 8px;
    }
    .btn-submit:hover {
      background: var(--accent-hover);
    }
    .privacy-notice {
      font-size: 12px;
      color: #94A3B8;
      text-align: center;
      margin-top: 12px;
    }
    .site-footer {
      background: #081726;
      color: #94A3B8;
      padding: 60px 0 25px;
      border-top: 3px solid var(--primary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      color: #fff;
      font-size: 15px;
      margin-bottom: 18px;
      font-weight: 600;
    }
    .footer-col ul li {
      margin-bottom: 10px;
      font-size: 13px;
    }
    .footer-col ul li a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
    }
    .story-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
    }
    .story-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-content {
      padding: 32px;
    }
    .story-item {
      margin-bottom: 16px;
    }
    .story-label {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 4px;
    }
    .story-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .feedback-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .feedback-card .stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 12px;
    }
    .feedback-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }
    .user-avatar {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
    }
    .user-meta h5 {
      font-size: 14px;
      color: var(--text-main);
    }
    .user-meta p {
      font-size: 12px;
      color: #94A3B8;
    }
    .faq-accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-item summary {
      padding: 16px 20px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      color: var(--text-main);
      background-color: #fff;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: "+";
      font-size: 18px;
      color: var(--accent);
    }
    .faq-item[open] summary::after {
      content: "-";
    }
    .faq-ans {
      padding: 0 20px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid #F1F5F9;
      margin-top: 6px;
    }
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .partner-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 28px;
      }
      .hero-metrics-bar {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
      }
      .hero-metric-item {
        border-right: none;
      }
      .grid-2, .grid-3 {
        grid-template-columns: 1fr;
      }
      .story-card {
        grid-template-columns: 1fr;
      }
      .main-nav {
        display: none;
      }
      .top-info {
        display: none;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }