/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #06B6D4;
      --accent-purple: #6366F1;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B0F19;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
      --shadow-hover: 0 10px 25px -3px rgba(6, 182, 212, 0.15);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      overflow-x: hidden;
      -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: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 双行导航设计 */
    .top-bar {
      background: #0b1120;
      color: var(--text-light);
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10B981;
    }
    .top-contact {
      display: flex;
      gap: 20px;
    }

    header.main-header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    header.main-header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 18px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.01em;
    }
    .logo-badge {
      background: linear-gradient(135deg, var(--accent), var(--accent-purple));
      color: #fff;
      padding: 4px 8px;
      border-radius: var(--radius-sm);
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
    }
    nav.nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    nav.nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
    }
    nav.nav-links a:hover, nav.nav-links a.active {
      color: var(--accent);
    }
    .nav-cta-btn {
      background: var(--primary);
      color: #ffffff !important;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      transition: var(--transition);
      border: 1px solid var(--primary);
    }
    .nav-cta-btn:hover {
      background: var(--accent);
      border-color: var(--accent);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.25);
    }

    /* Section 通用 */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
      max-width: 760px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 8px;
      background: rgba(6, 182, 212, 0.08);
      padding: 4px 12px;
      border-radius: 20px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.3;
      margin-bottom: 12px;
      letter-spacing: -0.01em;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* 板块 1: 无大图首屏，图标矩阵 + 状态条 + 短标题 */
    #hero {
      background: #ffffff;
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-status-strip {
      display: inline-flex;
      align-items: center;
      background: #F1F5F9;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .hero-status-strip span {
      color: var(--accent);
      font-weight: 600;
      margin-left: 6px;
    }
    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .hero-intro {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.85;
      max-width: 820px;
      margin-bottom: 36px;
    }
    .hero-action-group {
      display: flex;
      gap: 16px;
      align-items: center;
      margin-bottom: 48px;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 14px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: var(--shadow-sm);
    }
    .btn-primary:hover {
      background: var(--accent);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.3);
    }
    .btn-secondary {
      background: #fff;
      color: var(--text-main);
      padding: 14px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }
    .btn-secondary:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    .hero-matrix {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 10px;
    }
    .matrix-card {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      transition: var(--transition);
    }
    .matrix-card:hover {
      background: #fff;
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .matrix-icon {
      width: 42px;
      height: 42px;
      background: rgba(6, 182, 212, 0.1);
      color: var(--accent);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 14px;
      font-weight: 700;
    }
    .matrix-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .matrix-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 2: KPI看板 */
    #metrics-kpi {
      background: #0B0F19;
      color: #fff;
      padding: 60px 0;
    }
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .kpi-card {
      border-left: 2px solid var(--accent);
      padding-left: 20px;
    }
    .kpi-value {
      font-size: 40px;
      font-weight: 800;
      color: #fff;
      line-height: 1.1;
      margin-bottom: 6px;
      font-feature-settings: "tnum";
    }
    .kpi-value span {
      color: var(--accent);
      font-size: 22px;
    }
    .kpi-label {
      font-size: 14px;
      color: var(--text-light);
      font-weight: 500;
    }

    /* 板块 3: 服务矩阵 */
    #service-matrix {
      background: #ffffff;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      background: #fff;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .service-badge {
      align-self: flex-start;
      font-size: 12px;
      background: #F1F5F9;
      color: var(--primary);
      padding: 3px 10px;
      border-radius: 4px;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .service-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .service-features {
      list-style: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }
    .service-features li {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .service-features li::before {
      content: "•";
      color: var(--accent);
      font-weight: bold;
    }

    /* 板块 4: 结果对比 */
    #comparison {
      background: var(--bg-light);
    }
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-box {
      border-radius: var(--radius-md);
      padding: 36px 32px;
      border: 1px solid var(--border-color);
    }
    .compare-box.traditional {
      background: #FFFFFF;
      border-left: 4px solid #94A3B8;
    }
    .compare-box.cloud-native {
      background: #FFFFFF;
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .compare-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      padding: 12px 0;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
    }
    .compare-list li:last-child {
      border-bottom: none;
    }
    .compare-val {
      font-weight: 600;
      color: var(--primary);
    }

    /* 板块 5: 里程碑与研发演进 */
    #milestones {
      background: #FFFFFF;
    }
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .timeline-card {
      position: relative;
      padding: 24px;
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }
    .step-num {
      font-size: 32px;
      font-weight: 800;
      color: rgba(15, 23, 42, 0.08);
      margin-bottom: 12px;
      line-height: 1;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 6: 案例故事 (带图文) */
    #case-story {
      background: var(--bg-light);
    }
    .story-card-wrapper {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: grid;
      grid-template-columns: 5fr 7fr;
      box-shadow: var(--shadow-sm);
    }
    .story-img-box {
      position: relative;
      min-height: 380px;
    }
    .story-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-content {
      padding: 48px 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-tag {
      color: var(--accent);
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .story-heading {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .story-body {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .story-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .story-stat-item h4 {
      font-size: 22px;
      color: var(--primary);
      font-weight: 800;
    }
    .story-stat-item p {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 板块 7: 资讯 */
    #insights {
      background: #ffffff;
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #fff;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .news-cover {
      height: 200px;
      overflow: hidden;
    }
    .news-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-card:hover .news-cover img {
      transform: scale(1.05);
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-meta {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 8px;
      display: flex;
      justify-content: space-between;
    }
    .news-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-summary {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 8: 平台保障 */
    #platform-security {
      background: #0B0F19;
      color: #fff;
      padding: 90px 0;
      background-image: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
    }
    #platform-security .section-title {
      color: #ffffff;
    }
    #platform-security .section-desc {
      color: var(--text-light);
    }
    .security-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .security-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      transition: var(--transition);
    }
    .security-card:hover {
      background: rgba(255, 255, 255, 0.06);
      border-color: var(--accent);
    }
    .security-icon {
      font-size: 24px;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .security-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: #fff;
    }
    .security-card p {
      font-size: 13px;
      color: var(--text-light);
      line-height: 1.7;
    }

    /* 板块 9: 快速解答 (FAQ) */
    #faq-section {
      background: var(--bg-light);
    }
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-toggle {
      font-size: 20px;
      color: var(--accent);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.75;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
    }

    /* 板块 10: 架构白皮书预约与工程转化 (单页唯一收口) */
    #cta-consult {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
    }
    .cta-card {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: #ffffff;
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .cta-info h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
      letter-spacing: -0.01em;
    }
    .cta-info p {
      font-size: 15px;
      color: var(--text-light);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .cta-features {
      display: flex;
      gap: 20px;
      font-size: 13px;
      color: var(--accent);
      font-weight: 600;
    }
    .cta-form {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: #F8FAFC;
    }
    .form-control:focus {
      border-color: var(--accent);
      background: #ffffff;
    }
    .btn-submit {
      width: 100%;
      background: var(--accent);
      color: #ffffff;
      border: none;
      padding: 14px;
      font-size: 15px;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: #0891B2;
    }

    /* 页脚设计 */
    footer.site-footer {
      background: #070B13;
      color: var(--text-light);
      padding: 60px 0 30px;
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h3 {
      font-size: 18px;
      color: #ffffff;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
      max-width: 320px;
    }
    .footer-links h4 {
      font-size: 14px;
      font-weight: 700;color: #ffffff;
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .footer-links ul {
      list-style: none;
    }
    .footer-links ul li {
      margin-bottom: 10px;
    }
    .footer-links ul li a:hover {
      color: var(--accent);
    }
    .footer-contact-item {
      margin-bottom: 12px;
      line-height: 1.6;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 移动端响应式断点 */
    @media (max-width: 1024px) {
      .hero-matrix, .timeline-grid, .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid, .news-grid, .security-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .story-card-wrapper {
        grid-template-columns: 1fr;
      }
      .cta-card {
        grid-template-columns: 1fr;
        padding: 40px 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-contact {
        display: none;
      }
      header.main-header .container {
        height: 64px;
      }
      nav.nav-links {
        display: none;
      }
      .hero-title {
        font-size: 32px;
      }
      .hero-matrix, .timeline-grid, .kpi-grid, .services-grid, .news-grid, .security-grid, .compare-container {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .hero-action-group {
        flex-direction: column;
        align-items: stretch;
      }
      .btn-primary, .btn-secondary {
        justify-content: center;
      }
    }