/* roulang page: index */
:root {
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #0B1120;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-light: #F8FAFC;
      --text-light-sub: #94A3B8;
      --primary: #0F172A;
      --accent-blue: #0284C7;
      --accent-green: #10B981;
      --border-color: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.08);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 5px 10px -2px rgba(0, 0, 0, 0.02);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 12px 20px -3px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
      --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* Top Bar */
    .top-bar {
      height: 36px;
      background: #F1F5F9;
      font-size: 12px;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border-color);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-green);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }

    /* Main Navigation */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      height: 72px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
    }
    .nav-wrapper {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-box span.mark {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 16px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 24px;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--accent-blue);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background: #1E293B;
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent-blue);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background: #0369A1;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      background: #F1F5F9;
      border-color: #CBD5E1;
    }
    .btn-outline-white {
      background: transparent;
      border-color: var(--border-dark);
      color: #FFFFFF;
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }

    /* Section Global */
    section {
      padding: 88px 0;
      position: relative;
    }
    .section-light {
      background-color: var(--bg-page);
    }
    .section-white {
      background-color: #FFFFFF;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-light);
    }
    .section-head {
      margin-bottom: 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.8px;
      text-transform: uppercase;
      color: var(--accent-blue);
      margin-bottom: 8px;
    }
    .section-dark .section-tag {
      color: #38BDF8;
    }
    .section-title {
      font-size: clamp(26px, 3.2vw, 36px);
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-dark .section-title {
      color: var(--text-light);
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 680px;
      line-height: 1.75;
    }
    .section-dark .section-desc {
      color: var(--text-light-sub);
    }

    /* 板块 1: Hero */
    .hero-section {
      position: relative;
      background-color: var(--bg-dark);
      color: #FFFFFF;
      padding: 100px 0 120px;
      overflow: hidden;
      min-height: 640px;
      display: flex;
      align-items: center;
    }
    .hero-bg-poster {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.22;
      filter: saturate(1.2);
    }
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(180deg, rgba(11, 17, 32, 0.7) 0%, rgba(11, 17, 32, 0.95) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 820px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(2, 132, 199, 0.2);
      border: 1px solid rgba(56, 189, 248, 0.4);
      color: #38BDF8;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-h1 {
      font-size: clamp(34px, 4.5vw, 54px);
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-h1 span {
      color: #38BDF8;
    }
    .hero-intro {
      font-size: 16px;
      color: var(--text-light-sub);
      line-height: 1.8;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    /* 板块 2: 品牌与全栈架构 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .intro-text-box h3 {
      font-size: 20px;
      margin: 16px 0 12px;
      color: var(--text-main);
    }
    .spec-block {
      background: #F1F5F9;
      border-left: 4px solid var(--accent-blue);
      padding: 16px 20px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      margin: 24px 0;
      font-size: 14px;
      line-height: 1.6;
      color: var(--text-main);
    }
    .intro-media {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .intro-media img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      transition: var(--transition);
    }
    .intro-media:hover img {
      transform: scale(1.02);
    }

    /* 板块 3: 六大核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #CBD5E1;
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: #F1F5F9;
      color: var(--accent-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .tag-group {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag {
      font-size: 12px;
      padding: 3px 8px;
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      color: var(--text-body);
    }

    /* 板块 4: 产品矩阵 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .product-thumb {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-body h3 {
      font-size: 18px;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .product-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .spec-list {
      list-style: none;
      font-size: 13px;
      color: var(--text-body);
      margin-bottom: 24px;
      flex-grow: 1;
    }
    .spec-list li {
      padding: 4px 0;
      position: relative;
      padding-left: 14px;
    }
    .spec-list li::before {
      content: "•";
      color: var(--accent-blue);
      position: absolute;
      left: 0;
      font-weight: bold;
    }

    /* 板块 5: 深色案例与理念 */
    .dark-case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .stepper-list {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .stepper-item {
      display: flex;
      gap: 16px;
    }
    .step-number {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(2, 132, 199, 0.2);
      border: 1px solid var(--accent-blue);
      color: #38BDF8;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
      flex-shrink: 0;
    }
    .step-body h4 {
      font-size: 16px;
      color: #FFFFFF;
      margin-bottom: 6px;
    }
    .step-body p {
      font-size: 14px;
      color: var(--text-light-sub);
    }
    .case-preview-frame {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-dark);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }
    .case-preview-frame img {
      width: 100%;
      height: 400px;
      object-fit: cover;
    }

    /* 板块 6: 场景化故事 */
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .story-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .story-card h3 {
      font-size: 18px;
      color: var(--text-main);
      margin-bottom: 16px;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 12px;
    }
    .story-flow {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .flow-row {
      display: grid;
      grid-template-columns: 80px 1fr;
      gap: 12px;
      font-size: 14px;
    }
    .flow-label {
      font-weight: 700;
      color: var(--text-muted);
    }
    .flow-desc {
      color: var(--text-body);
    }

    /* 板块 7: 运行数据指标条 */
    .metrics-bar {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item .metric-value {
      font-size: 44px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.1;
      font-feature-settings: "tnum";
      margin-bottom: 8px;
    }
    .metric-item .metric-value span {
      font-size: 20px;
      font-weight: 600;
      color: var(--accent-blue);
      margin-left: 2px;
    }
    .metric-item .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 板块 8: 适用人群 */
    .audience-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .audience-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
    }
    .audience-card:hover {
      border-color: var(--accent-blue);
      transform: translateY(-3px);
    }
    .audience-role {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .audience-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 9: 评价与口碑 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-text {
      font-size: 14px;
      line-height: 1.8;
      color: var(--text-body);
      margin-bottom: 20px;
      font-style: normal;
    }
    .client-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }
    .client-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--text-muted);
      font-size: 14px;
    }
    .client-meta h4 {
      font-size: 14px;
      color: var(--text-main);
    }
    .client-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 板块 10: 资讯与动态 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .news-thumb {
      height: 180px;
      overflow: hidden;
    }
    .news-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .news-card:hover .news-thumb img {
      transform: scale(1.05);
    }
    .news-body {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
      line-height: 1.4;
    }
    .news-excerpt {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--accent-blue);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 11: 常见问答 */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-item summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: "+";
      font-size: 20px;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }
    .faq-item[open] summary::after {
      content: "-";
    }
    .faq-content {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      border-top: 1px solid #F8FAFC;
    }

    /* 板块 12: 咨询与演示转化表单 */
    .cta-card {
      background: var(--bg-dark);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: #FFFFFF;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-dark);
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-info h3 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .cta-info p {
      font-size: 15px;
      color: var(--text-light-sub);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .form-box {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 6px;
      color: var(--text-light-sub);
    }
    .form-control {
      width: 100%;
      height: 44px;
      padding: 0 14px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      color: #FFFFFF;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--accent-blue);
      background: rgba(255, 255, 255, 0.12);
    }
    .form-control option {
      background: var(--bg-dark);
      color: #FFFFFF;
    }
    .form-hint {
      font-size: 12px;
      color: var(--text-light-sub);
      margin-top: 12px;
      text-align: center;
    }

    /* Footer */
    footer {
      background: #090D16;
      color: #94A3B8;
      padding: 64px 0 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 13px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h4 {
      font-size: 18px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 12px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
      color: #64748B;
    }
    .footer-col h5 {
      font-size: 14px;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 12px;
    }

    /* Mobile Responsive */
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    @media (max-width: 1024px) {
      .features-grid, .products-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .audience-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
      }
      .nav-links.show {
        display: flex;
      }
      .intro-grid, .dark-case-grid, .stories-grid, .cta-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .features-grid, .products-grid, .testimonials-grid, .news-grid, .audience-grid {
        grid-template-columns: 1fr;
      }
      .cta-card {
        padding: 32px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }