/* roulang page: index */
:root {
      --bg-primary: #F8FAFC;
      --bg-surface: #FFFFFF;
      --bg-dark: #0B1120;
      --bg-dark-card: #151E32;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #F8FAFC;
      --text-light-muted: #94A3B8;
      --brand-blue: #0052FF;
      --brand-blue-hover: #0045D8;
      --brand-green: #00E599;
      --border-light: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.08);
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 30px -10px rgba(0, 0, 0, 0.06);
      --shadow-highlight: 0 0 25px rgba(0, 82, 255, 0.15);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-stack);
      color: var(--text-main);
      background-color: var(--bg-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      font-size: 0.8125rem;
      font-weight: 600;
      border-radius: 9999px;
      background: rgba(0, 82, 255, 0.08);
      color: var(--brand-blue);
      border: 1px solid rgba(0, 82, 255, 0.2);
    }
    .badge-pill-green {
      background: rgba(0, 229, 153, 0.1);
      color: #00A86B;
      border-color: rgba(0, 229, 153, 0.3);
    }
    .section-eyebrow {
      text-transform: uppercase;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      color: var(--brand-blue);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.02em;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      max-width: 820px;
      margin-bottom: 40px;
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 26px;
      font-weight: 600;
      font-size: 0.9375rem;
      border-radius: var(--radius-md);
      cursor: pointer;
      min-height: 48px;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .btn-primary {
      background-color: var(--brand-blue);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(0, 82, 255, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--brand-blue-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 82, 255, 0.4);
    }
    .btn-secondary {
      background-color: #FFFFFF;
      color: var(--text-main);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      background-color: #F1F5F9;
      border-color: #CBD5E1;
      transform: translateY(-2px);
    }
    .btn-dark {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .btn-dark:hover {
      background-color: #1E293B;
      transform: translateY(-2px);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
    }
    .header-topbar {
      background-color: var(--bg-dark);
      color: var(--text-light-muted);
      font-size: 0.75rem;
      padding: 6px 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.375rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.03em;
    }
    .brand-logo-mark {
      width: 34px;
      height: 34px;
      border-radius: var(--radius-sm);
      background: var(--brand-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-weight: 900;
      font-size: 1.125rem;
      box-shadow: 0 2px 8px rgba(0, 82, 255, 0.35);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 4px;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--brand-blue);
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      padding: 8px;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .section-padding {
      padding: 96px 0;
    }
    .section-light {
      background-color: var(--bg-surface);
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-light);
    }
    .hero-banner {
      position: relative;
      padding: 80px 0 100px;
      background: linear-gradient(180deg, #F8FAFC 0%, #EDF2F7 100%);
      border-bottom: 1px solid var(--border-light);
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-copy h1 {
      font-size: 2.875rem;
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: -0.03em;
      color: var(--text-main);
      margin: 16px 0 24px;
    }
    .hero-copy p {
      font-size: 1.0625rem;
      line-height: 1.75;
      color: #475569;
      margin-bottom: 32px;
    }
    .hero-ctas {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-badges-row {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      padding-top: 24px;
      border-top: 1px solid var(--border-light);
      font-size: 0.8125rem;
      color: var(--text-muted);
    }
    .hero-badges-row span {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-media-wrapper {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.8);
      background: #FFFFFF;
    }
    .hero-media-wrapper img {
      width: 100%;
      height: 480px;
      object-fit: cover;
      transition: transform 0.6s ease;
    }
    .hero-media-wrapper:hover img {
      transform: scale(1.02);
    }
    .media-floating-tag {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(11, 17, 32, 0.85);
      backdrop-filter: blur(8px);
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      color: #FFFFFF;
      font-size: 0.8125rem;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-light);
      margin-top: -50px;
      position: relative;
      z-index: 10;
    }
    .metric-item {
      text-align: left;
      padding: 0 16px;
      border-right: 1px solid var(--border-light);
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-value {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--brand-blue);
      line-height: 1.1;
      margin-bottom: 6px;
      letter-spacing: -0.03em;
    }
    .metric-value small {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-left: 2px;
    }
    .metric-label {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-desc {
      font-size: 0.75rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .tech-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .tech-spec-box {
      background: #F1F5F9;
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 24px;
      border-left: 4px solid var(--brand-blue);
    }
    .tech-spec-title {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .tech-spec-item {
      font-size: 0.8125rem;
      color: #475569;
      line-height: 1.6;
    }
    .tech-image-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-lg);
    }
    .tech-image-wrap img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .advantage-card {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 82, 255, 0.3);
      box-shadow: var(--shadow-lg);
    }
    .adv-icon {
      width: 44px;
      height: 44px;
      background: rgba(0, 82, 255, 0.06);
      color: var(--brand-blue);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 20px;
    }
    .advantage-card h3 {
      font-size: 1.1875rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .advantage-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(0, 82, 255, 0.3);
    }
    .product-media {
      height: 240px;
      overflow: hidden;
      background: #E2E8F0;
      position: relative;
    }
    .product-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .product-body {
      padding: 28px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .product-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.65;
    }
    .product-specs {
      background: #F8FAFC;
      border-radius: var(--radius-sm);
      padding: 14px 16px;
      margin-bottom: 24px;
      font-size: 0.8125rem;
      color: #334155;
    }
    .spec-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 6px;
    }
    .spec-row:last-child {
      margin-bottom: 0;
    }
    .spec-row span:first-child {
      color: var(--text-muted);
    }
    .spec-row span:last-child {
      font-weight: 600;
    }
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-col {
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-light);
    }
    .compare-traditional {
      background: #FFFFFF;
    }
    .compare-robot {
      background: #F0FDF4;
      border-color: rgba(0, 229, 153, 0.4);
      box-shadow: 0 10px 30px -10px rgba(0, 229, 153, 0.15);
    }
    .compare-header {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 20px;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .compare-robot .compare-header {
      border-bottom-color: rgba(0, 229, 153, 0.3);
      color: #065F46;
    }
    .compare-list li {
      margin-bottom: 16px;
      font-size: 0.9375rem;
      line-height: 1.6;
      display: flex;
      gap: 12px;
      align-items: flex-start;
    }
    .compare-list li::before {
      content: "•";
      font-size: 1.25rem;
      line-height: 1;
      color: var(--text-muted);
    }
    .compare-robot .compare-list li::before {
      content: "✓";
      color: #059669;
      font-weight: bold;
    }
    .dark-section-title {
      color: #FFFFFF;
    }
    .dark-section-desc {
      color: var(--text-light-muted);
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scenario-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: all 0.3s ease;
    }
    .scenario-card:hover {
      border-color: var(--brand-blue);
      transform: translateY(-4px);
    }
    .scenario-card h3 {
      font-size: 1.125rem;
      font-weight: 700;
      color: #FFFFFF;
      margin: 14px 0 10px;
    }
    .scenario-card p {
      font-size: 0.8125rem;
      color: var(--text-light-muted);
      line-height: 1.6;
    }
    .case-story-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      box-shadow: var(--shadow-sm);
    }
    .case-content {
      padding: 48px;
    }
    .case-media {
      background: #CBD5E1;
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-tags {
      display: flex;
      gap: 10px;
      margin-bottom: 16px;
    }
    .case-title {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .case-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .case-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px solid var(--border-light);
    }
    .case-stat-num {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--brand-blue);
    }
    .case-stat-lbl {
      font-size: 0.75rem;
      color: var(--text-muted);
    }
    .testimonial-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .rating-stars {
      color: #F59E0B;
      font-size: 0.875rem;
      letter-spacing: 2px;
      margin-bottom: 14px;
    }
    .testimonial-text {
      font-size: 0.9375rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 24px;
      font-style: italic;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--text-muted);
    }
    .author-info h4 {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-info p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }
    .news-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      border-color: rgba(0, 82, 255, 0.4);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }
    .news-meta {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      justify-content: space-between;
    }
    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .news-excerpt {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
    }
    .guarantee-item h4 {
      font-size: 1.0625rem;
      font-weight: 700;
      margin: 12px 0 8px;
    }
    .guarantee-item p {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .accordion-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .accordion-item {
background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.25s ease;
    }
    .accordion-item:hover {
      border-color: #CBD5E1;
    }
    .accordion-trigger {
      width: 100%;
      padding: 22px 24px;
      text-align: left;
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--text-main);
      background: transparent;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .accordion-trigger::after {
      content: "+";
      font-size: 1.375rem;
      font-weight: 400;
      color: var(--text-muted);
      transition: transform 0.3s ease;
    }
    .accordion-item.active .accordion-trigger::after {
      transform: rotate(45deg);
      color: var(--brand-blue);
    }
    .accordion-panel {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
      background: #F8FAFC;
    }
    .accordion-item.active .accordion-panel {
      max-height: 220px;
      padding: 0 24px 22px 24px;
    }
    .accordion-panel p {
      font-size: 0.9375rem;
      color: #475569;
      line-height: 1.7;
    }
    .conversion-card {
      background: linear-gradient(135deg, #0B1120 0%, #151E32 100%);
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      color: #FFFFFF;
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 56px;
      align-items: center;
      box-shadow: 0 20px 45px -10px rgba(11, 17, 32, 0.4);
      border: 1px solid var(--border-dark);
    }
    .conversion-info h3 {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .conversion-info p {
      font-size: 0.9375rem;
      color: var(--text-light-muted);
      line-height: 1.7;
      margin-bottom: 28px;
    }
    .conversion-form {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 32px;
      color: var(--text-main);
      box-shadow: var(--shadow-lg);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: #334155;
    }
    .form-control {
      width: 100%;
      height: 44px;
      padding: 0 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      background: #F8FAFC;
      color: var(--text-main);
      font-size: 0.875rem;
      transition: all 0.2s ease;
    }
    .form-control:focus {
      background: #FFFFFF;
      border-color: var(--brand-blue);
      box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.15);
    }
    .form-submit {
      width: 100%;
      height: 46px;
      margin-top: 8px;
    }
    .site-footer {
      background: #090D14;
      color: var(--text-light-muted);
      padding: 72px 0 36px;
      border-top: 1px solid var(--border-dark);
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.9fr 1.1fr 1fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-col h5 {
      font-size: 0.9375rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 18px;
      letter-spacing: -0.01em;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      padding-top: 28px;
      border-top: 1px solid var(--border-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
    }
    @media (max-width: 1024px) {
      .hero-grid, .tech-grid, .case-story-card, .conversion-card {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-item:nth-child(2) {
        border-right: none;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid, .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .main-nav {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 64px 0;
      }
      .hero-banner {
        padding: 48px 0 64px;
      }
      .hero-copy h1 {
        font-size: 2.125rem;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
        margin-top: 24px;
      }
      .metric-item {
        border-right: none;
        border-bottom: 1px solid var(--border-light);
        padding-bottom: 16px;
      }
      .metric-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
      }
      .grid-3, .comparison-grid, .scenario-grid, .guarantee-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .conversion-card {
        padding: 32px 20px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }