/* roulang page: index */
:root {
      --primary: #1D4ED8;
      --primary-dark: #1E40AF;
      --primary-light: #3B82F6;
      --accent-cyan: #06B6D4;
      --accent-amber: #F59E0B;
      --bg-white: #FFFFFF;
      --bg-light: #F8FAFC;
      --bg-slate: #F1F5F9;
      --text-main: #0F172A;
      --text-sub: #475569;
      --text-muted: #94A3B8;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      --shadow-lg: 0 20px 25px -5px rgba(29, 78, 216, 0.08), 0 8px 10px -6px rgba(29, 78, 216, 0.04);
      --container-width: 1240px;
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      -webkit-font-smoothing: antialiased;
    }

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-white);
      color: var(--text-main);
      line-height: 1.65;
    }

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

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

    ul, ol {
      list-style: none;
    }

    button, input, select, textarea {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航体系 */
    .top-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    }

    .header-statusbar {
      background-color: #0F172A;
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .statusbar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .pulse-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #38BDF8;
    }

    .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
    }

    .header-main {
      padding: 16px 0;
    }

    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .site-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .brand-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-size: 1.1rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-item {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-sub);
    }

    .nav-item:hover, .nav-item.active {
      color: var(--primary);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn-header {
      padding: 9px 20px;
      font-size: 0.875rem;
      font-weight: 600;
      background-color: var(--primary);
      color: #FFF;
      border-radius: var(--radius-sm);
      box-shadow: 0 2px 4px rgba(29, 78, 216, 0.2);
    }

    .btn-header:hover {
      background-color: var(--primary-dark);
      transform: translateY(-1px);
    }

    /* 基础区块样式 */
    .section-block {
      padding: 90px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .section-light {
      background-color: var(--bg-white);
    }

    .section-alt {
      background-color: var(--bg-light);
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 56px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(29, 78, 216, 0.08);
      color: var(--primary);
      border-radius: 999px;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.125rem;
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 按钮规范 */
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 30px;
      font-size: 1rem;
      font-weight: 600;
      background: linear-gradient(180deg, #2563EB 0%, var(--primary) 100%);
      color: #FFF;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.15);
      box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(29, 78, 216, 0.35);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 30px;
      font-size: 1rem;
      font-weight: 600;
      background: #FFFFFF;
      color: var(--text-sub);
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    .btn-outline:hover {
      color: var(--primary);
      border-color: var(--primary);
      background-color: var(--bg-light);
    }

    /* 1. Hero 资源下载站版式 */
    .hero-section {
      background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
      padding: 85px 0 95px;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: clamp(2.2rem, 3.8vw, 3.3rem);
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 24px;
    }

    .hero-p {
      font-size: 1.125rem;
      color: var(--text-sub);
      line-height: 1.8;
      margin-bottom: 40px;
    }

    .search-box-stage {
      max-width: 680px;
      margin: 0 auto 36px;
      background: #FFFFFF;
      padding: 8px 10px;
      border-radius: var(--radius-md);
      box-shadow: 0 12px 30px -5px rgba(15, 23, 42, 0.08);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .search-box-stage input {
      flex: 1;
      border: none;
      outline: none;
      font-size: 1rem;
      padding: 10px 14px;
      color: var(--text-main);
    }

    .search-quick-tags {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 10px;
      font-size: 0.875rem;
      color: var(--text-sub);
    }

    .quick-tag {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 999px;
      color: var(--text-sub);
    }

    .quick-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 2. 客户项目与工程故事区 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .case-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .case-img-box {
      height: 250px;
      overflow: hidden;
      position: relative;
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-body {
      padding: 30px;
      flex: 1;
    }

    .case-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      margin-bottom: 8px;
    }

    .case-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .case-desc {
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.65;
    }

    /* 3. 结果数据成果条 */
    .metrics-strip {
      background: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 100%);
      color: #FFFFFF;
      padding: 65px 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .metric-val {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .metric-label {
      font-size: 1rem;
      color: #93C5FD;
      font-weight: 500;
    }

    .metric-sub {
      font-size: 0.8125rem;
      color: #BFDBFE;
      margin-top: 4px;
    }

    /* 4. 前后对比区 (Traditional vs AI-Powered) */
    .comparison-table-wrap {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .comp-row {
      display: grid;
      grid-template-columns: 240px 1fr 1fr;
      border-bottom: 1px solid var(--border-color);
    }

    .comp-row:last-child {
      border-bottom: none;
    }

    .comp-header {
      background: var(--bg-slate);
      font-weight: 700;
      color: var(--text-main);
    }

    .comp-cell {
      padding: 22px 24px;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
    }

    .comp-cell.feature-name {
      font-weight: 600;
      background: #FAFAFA;
      border-right: 1px solid var(--border-color);
    }

    .comp-cell.bad {
      color: #64748B;
      background: #FFF;
      border-right: 1px solid var(--border-color);
    }

    .comp-cell.good {
      color: #0F172A;
      background: rgba(29, 78, 216, 0.02);
      font-weight: 600;
    }

    .icon-good {
      color: #10B981;
      margin-right: 8px;
      font-weight: 800;
    }

    .icon-bad {
      color: #EF4444;
      margin-right: 8px;
      font-weight: 800;
    }

    /* 5. 方法说明与底层架构 (Architecture) */
    .arch-flow-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .arch-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      position: relative;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .arch-card:hover {
      border-color: var(--primary-light);
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .arch-step-badge {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: rgba(29, 78, 216, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .arch-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .arch-card p {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 6. 核心痛点板块 (Challenges) */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-top: 4px solid #EF4444;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }

    .pain-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .pain-desc {
      font-size: 0.925rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .pain-sol {
      background: var(--bg-slate);
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* 7. 核心功能六宫格 (Features) */
    .feat-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feat-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .feat-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }

    .feat-icon-box {
      width: 48px;
      height: 48px;
      background: #EFF6FF;
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 18px;
    }

    .feat-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feat-card p {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 8. 解决方案深色对比区块 (Dark Stage) */
    .dark-showcase-section {
      background-color: #0F172A;
      color: #FFFFFF;
      padding: 95px 0;
      position: relative;
    }

    .dark-showcase-section .section-title {
      color: #FFFFFF;
    }

    .dark-showcase-section .section-desc {
      color: #94A3B8;
    }

    .dark-stage-box {
      background: #1E293B;
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-xl);
      padding: 36px;
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .stage-img-side {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.15);
      position: relative;
    }

    .stage-img-side img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    .stage-info-side h3 {
      font-size: 1.8rem;
      margin-bottom: 18px;
      line-height: 1.35;
    }

    .stage-info-side p {
      color: #CBD5E1;
      font-size: 1rem;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .stage-specs-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .stage-spec-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: #E2E8F0;
    }

    .spec-dot {
      width: 6px;
      height: 6px;
      background: var(--accent-cyan);
      border-radius: 50%;
    }

    /* 9. 选型产品矩阵 (Products) */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .prod-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .prod-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .prod-badge {
      align-self: flex-start;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: #EFF6FF;
      padding: 4px 10px;
      border-radius: 6px;
      margin-bottom: 16px;
    }

    .prod-title {
      font-size: 1.45rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .prod-desc {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 24px;
      flex: 1;
    }

    .prod-meta {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      margin-bottom: 24px;
    }

    .meta-line {
      display: flex;
      justify-content: space-between;
      font-size: 0.875rem;
      color: var(--text-sub);
      margin-bottom: 8px;
    }

    .meta-line span:last-child {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 10. 前沿动态与内嵌资讯 (Insights) */
    .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-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .news-img {
      height: 190px;
      overflow: hidden;
    }

    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .news-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .news-meta-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
      line-height: 1.45;
    }

    .news-desc {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex: 1;
    }

    /* 11. 异议拆解与常见问题 (FAQ) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-summary {
      padding: 20px 24px;
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-summary::-webkit-details-marker {
      display: none;
    }

    .faq-summary:after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--primary);
    }

    details[open] .faq-summary:after {
      content: "-;
    }

    details[open] .faq-summary {
      border-bottom: 1px solid var(--border-color);
      background-color: var(--bg-slate);
    }

    .faq-content {
      padding: 20px 24px;
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 12. 底部转化执行区 (CTA) */
    .cta-card-wrap {
      background: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%);
      border-radius: var(--radius-xl);
      padding: 60px 48px;
      color: #FFFFFF;
      text-align: center;
      box-shadow: var(--shadow-lg);
      position: relative;
      overflow: hidden;
    }

    .cta-card-wrap h2 {
      font-size: 2.25rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #FFFFFF;
    }

    .cta-card-wrap p {
      font-size: 1.05rem;
      color: #BFDBFE;
      max-width: 640px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .cta-form {
      max-width: 580px;
      margin: 0 auto;
      display: flex;
      gap: 12px;
      background: rgba(255, 255, 255, 0.1);
      padding: 8px;
      border-radius: var(--radius-md);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .cta-form input {
      flex: 1;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: none;
      outline: none;
      font-size: 1rem;
      background: #FFFFFF;
      color: var(--text-main);
    }

    .cta-form button {
      padding: 14px 28px;
      background: #0F172A;
      color: #FFFFFF;
      border: none;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      white-space: nowrap;
      transition: var(--transition);
    }

    .cta-form button:hover {
      background: #020617;
      transform: translateY(-1px);
    }

    .cta-footnote {
      margin-top: 18px;
      font-size: 0.8125rem;
      color: #93C5FD;
    }

    /* 全功能页脚 */
    .site-footer {
      background-color: #0B1120;
      color: #94A3B8;
      padding-top: 80px;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
      gap: 40px;
      padding-bottom: 60px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-col-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 22px;
      letter-spacing: 0.5px;
    }

    .footer-links-list li {
      margin-bottom: 12px;
    }

    .footer-links-list a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }

    .footer-about-text {
      line-height: 1.7;
      margin-top: 16px;
      color: #64748B;
    }

    .footer-contact-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .footer-bottom {
      padding: 28px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
      color: #64748B;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .cases-grid, .pain-grid, .feat-grid, .arch-flow-grid, .product-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .dark-stage-box {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px;
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .section-block {
        padding: 60px 0;
      }
      .comp-row {
        grid-template-columns: 1fr;
      }
      .comp-cell.feature-name {
        background: #F1F5F9;
        border-right: none;
      }
      .comp-cell.bad {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .cta-form {
        flex-direction: column;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
      .cases-grid, .pain-grid, .feat-grid, .arch-flow-grid, .product-grid, .news-grid {
        grid-template-columns: 1fr;
      }
    }