/* roulang page: index */
:root {
      --primary: #0F5132;
      --primary-light: #198754;
      --accent: #0D6EFD;
      --dark: #111827;
      --gray-900: #1E293B;
      --gray-700: #475569;
      --gray-500: #64748B;
      --gray-300: #CBD5E1;
      --gray-100: #F1F5F9;
      --gray-50: #F8FAFC;
      --white: #FFFFFF;
      --border: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 12px 24px -4px rgba(15,81,50,0.12), 0 4px 8px -2px rgba(0,0,0,0.05);
      --container: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--gray-700);
      background-color: var(--gray-50);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    button, input, select {
      font-family: inherit;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: var(--container);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .top-bar {
      background-color: var(--dark);
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .top-bar-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #34D399;
    }
    .top-bar-badge::before {
      content: "";
      width: 6px;
      height: 6px;
      background-color: #34D399;
      border-radius: 50%;
      box-shadow: 0 0 8px #34D399;
    }
    header.main-header {
      position: sticky;
      top: 0;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      z-index: 1000;
      box-shadow: 0 1px 4px rgba(0,0,0,0.06);
      border-bottom: 1px solid var(--border);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      list-style: none;
      align-items: center;
      gap: 26px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--gray-900);
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-light);
    }
    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #fff;
      padding: 10px 20px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(15,81,50,0.25);
    }
    .nav-cta:hover {
      box-shadow: 0 6px 16px rgba(15,81,50,0.35);
      transform: translateY(-1px);
    }
    .section-wrap {
      padding: 72px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--dark);
      color: #E2E8F0;
    }
    .section-alt {
      background-color: #F1F5F9;
    }
    .section-header {
      margin-bottom: 40px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--gray-900);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 15px;
      color: var(--gray-700);
      max-width: 820px;
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }
    .badge-tag {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      background-color: rgba(25,135,84,0.12);
      color: var(--primary);
      margin-bottom: 10px;
      text-transform: uppercase;
    }
    .section-dark .badge-tag {
      background-color: rgba(52,211,153,0.15);
      color: #34D399;
    }
    #hero {
      position: relative;
      background: linear-gradient(rgba(17, 24, 39, 0.85), rgba(15, 81, 50, 0.9)), url('/assets/images/3bb6765bdb7e6ec4.webp') center/cover no-repeat;
      padding: 90px 0 80px;
      color: #fff;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.25fr 0.95fr;
      gap: 40px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -1px;
    }
    .hero-p {
      font-size: 16px;
      line-height: 1.8;
      color: #E2E8F0;
      margin-bottom: 28px;
    }
    .hero-meta-row {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
    }
    .hero-meta-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(5px);
      padding: 6px 14px;
      border-radius: 20px;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .btn-main {
      padding: 13px 28px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 600;
      background: linear-gradient(135deg, #10B981, #059669);
      color: #fff;
      box-shadow: 0 4px 14px rgba(16,185,129,0.3);
      cursor: pointer;
      border: none;
    }
    .btn-main:hover {
      background: linear-gradient(135deg, #059669, #047857);
      transform: translateY(-2px);
    }
    .btn-outline {
      padding: 13px 26px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.4);
      color: #fff;
      background: transparent;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: #fff;
    }
    .coupon-card {
      background: #FFFFFF;
      color: var(--gray-900);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.35);
      border: 2px dashed #10B981;
      position: relative;
    }
    .coupon-head {
      border-bottom: 1px dashed var(--border);
      padding-bottom: 16px;
      margin-bottom: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .coupon-price {
      font-size: 38px;
      font-weight: 800;
      color: #0F5132;
    }
    .coupon-price span {
      font-size: 16px;
      font-weight: 600;
    }
    .coupon-body ul {
      list-style: none;
      font-size: 14px;
      color: var(--gray-700);
      margin-bottom: 20px;
    }
    .coupon-body li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .coupon-body li::before {
      content: "✓";
      color: var(--primary-light);
      font-weight: bold;
    }
    .coupon-btn {
      width: 100%;
      text-align: center;
      display: block;
      padding: 12px;
      border-radius: 8px;
      background-color: var(--primary);
      color: #fff;
      font-weight: 700;
      font-size: 15px;
    }
    .coupon-btn:hover {
      background-color: var(--primary-light);
    }
    .split-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 36px;
      align-items: center;
    }
    .tech-spec-box {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 20px;
      box-shadow: var(--shadow-sm);
    }
    .spec-item {
      display: flex;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px solid #F1F5F9;
      font-size: 14px;
    }
    .spec-item:last-child {
      border-bottom: none;
    }
    .spec-name {
      color: var(--gray-500);
    }
    .spec-val {
      font-weight: 600;
      color: var(--gray-900);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-box {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .card-box:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(25,135,84,0.3);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(15,81,50,0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--gray-900);
      margin-bottom: 10px;
    }
    .card-p {
      font-size: 14px;
      color: var(--gray-700);
      line-height: 1.65;
    }
    .vehicle-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .vehicle-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }
    .vehicle-img-box {
      position: relative;
      height: 200px;
      overflow: hidden;
      background-color: #E2E8F0;
    }
    .vehicle-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .vehicle-card:hover .vehicle-img-box img {
      transform: scale(1.05);
    }
    .vehicle-badge-float {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(17,24,39,0.85);
      backdrop-filter: blur(4px);
      color: #34D399;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 600;
    }
    .vehicle-content {
      padding: 20px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .vehicle-specs {
      display: flex;
      justify-content: space-between;
      background: var(--gray-50);
      padding: 10px 12px;
      border-radius: 6px;
      font-size: 13px;
      margin: 14px 0;
      color: var(--gray-700);
    }
    .vehicle-price-row {
      margin-top: auto;
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
    }
    .price-num {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
    }
    .price-original {
      font-size: 12px;
      color: var(--gray-500);
      text-decoration: line-through;
    }
    .table-compare {
      width: 100%;
      border-collapse: collapse;
      margin-top: 24px;
      font-size: 14px;
    }
    .table-compare th, .table-compare td {
      padding: 14px 16px;
      text-align: left;
      border-bottom: 1px solid rgba(255,255,255,0.12);
    }
    .table-compare th {
      background: rgba(255,255,255,0.05);
      color: #94A3B8;
      font-weight: 600;
    }
    .table-compare tr:hover td {
      background: rgba(255,255,255,0.03);
    }
    .table-highlight {
      color: #34D399;
      font-weight: 700;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .story-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      display: flex;
      box-shadow: var(--shadow-sm);
    }
    .story-img {
      width: 40%;
      object-fit: cover;
    }
    .story-body {
      padding: 20px;
      width: 60%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .metrics-bar {
      background: linear-gradient(135deg, #0F5132 0%, #111827 100%);
      color: #fff;
      padding: 44px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .metric-value {
      font-size: 38px;
      font-weight: 800;
      color: #34D399;
      letter-spacing: -1px;
    }
    .metric-label {
      font-size: 14px;
      color: #CBD5E1;
      margin-top: 4px;
    }
    .review-bubble {
      background: #fff;
      padding: 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      position: relative;
      margin-bottom: 20px;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 14px;
    }
    .user-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #10B981;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }
    .accordion-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    details {
      padding: 16px 20px;
      cursor: pointer;
    }
    summary {
      font-weight: 700;
      font-size: 16px;
      color: var(--gray-900);
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    summary::-webkit-details-marker {
      display: none;
    }
    summary::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
    }
    details[open] summary::after {
      content: "−";
    }
    details p {
      margin-top: 12px;
      font-size: 14px;
      line-height: 1.7;
      color: var(--gray-700);
      border-top: 1px solid #F1F5F9;
      padding-top: 12px;
    }
    .contact-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--gray-900);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #fff;
    }
    .form-control:focus {
      border-color: var(--primary-light);
      box-shadow: 0 0 0 3px rgba(25,135,84,0.15);
    }
    .fixed-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(17,24,39,0.95);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 12px 20px;
      z-index: 999;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .fixed-btn-group {
      display: flex;
      gap: 12px;
    }
    footer.main-footer {
      background-color: #0B0F17;
      color: #94A3B8;
      padding: 60px 0 90px;
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 16px;
      margin-bottom: 18px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col li {
      margin-bottom: 10px;
    }
    .footer-col a:hover {
      color: #34D399;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }
    @media (max-width: 992px) {
      .hero-grid, .split-grid {
        grid-template-columns: 1fr;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }
      .story-card {
        flex-direction: column;
      }
      .story-img, .story-body {
        width: 100%;
      }
      .story-img {
        height: 180px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .fixed-bottom-bar {
        flex-direction: column;
        gap: 8px;
        text-align: center;
      }
      .fixed-btn-group {
        width: 100%;
      }
      .fixed-btn-group a {
        flex: 1;
        text-align: center;
      }
    }