/* roulang page: index */
:root {
      --primary: #0f172a;
      --primary-light: #1e293b;
      --accent: #0284c7;
      --accent-hover: #0369a1;
      --warning: #f59e0b;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-dark: #090d16;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #94a3b8;
      --border-color: #e2e8f0;
      --border-dark: rgba(255, 255, 255, 0.08);
      --font-mono: "JetBrains Mono", Inter, Menlo, Consolas, monospace;
      --radius: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 10px 15px -5px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
      --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    .top-bar {
      background-color: var(--primary);
      color: var(--text-light);
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-links {
      display: flex;
      gap: 20px;
    }

    .main-nav-bar {
      padding: 16px 0;
    }
    .main-nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--primary);
    }
    .brand-logo svg {
      width: 28px;
      height: 28px;
      fill: var(--accent);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9375rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn:hover {
      transform: translateY(-2px);
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
    }
    .btn-primary:hover {
      background-color: var(--accent);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
    }
    .btn-outline {
      border-color: var(--border-color);
      background-color: transparent;
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background-color: #ffffff;
    }
    .btn-sm {
      padding: 6px 14px;
      font-size: 0.8125rem;
    }

    /* 板块通用标准 */
    .section-spacing {
      padding: 96px 0;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #ffffff;
    }
    .section-alt {
      background-color: #f1f5f9;
    }
    .section-head {
      margin-bottom: 56px;
    }
    .section-head.text-center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--accent);
      background-color: rgba(2, 132, 199, 0.08);
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
    }
    .section-dark .section-badge {
      background-color: rgba(2, 132, 199, 0.2);
      color: #38bdf8;
    }
    .section-title {
      font-size: clamp(1.75rem, 3vw, 2.25rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .section-dark .section-desc {
      color: var(--text-light);
    }

    /* Hero 首屏 */
    .hero-section {
      position: relative;
      background: linear-gradient(rgba(15, 23, 42, 0.85), rgba(15, 23, 42, 0.92)), url('/assets/images/551700ecf41ec9ca.webp') center/cover no-repeat;
      color: #ffffff;
      padding: 100px 0 110px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: clamp(2.25rem, 5vw, 3.5rem);
      line-height: 1.15;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
    }
    .hero-h1 span {
      color: #38bdf8;
    }
    .hero-p {
      font-size: 1.0625rem;
      line-height: 1.75;
      color: #cbd5e1;
      margin-bottom: 32px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-specs-row {
      display: flex;
      gap: 28px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }
    .spec-item .num {
      font-family: var(--font-mono);
      font-size: 1.5rem;
      font-weight: 700;
      color: #38bdf8;
    }
    .spec-item .label {
      font-size: 0.8125rem;
      color: var(--text-light);
    }

    /* 首屏预约卡片 */
    .booking-box {
      background-color: var(--bg-card);
      color: var(--text-main);
      padding: 32px;
      border-radius: var(--radius);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25);
      border: 1px solid var(--border-color);
    }
    .booking-box h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .booking-box p {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .form-input, .form-select {
      width: 100%;
      padding: 10px 12px;
      font-size: 0.875rem;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--accent);
      background: #ffffff;
    }
    .slot-selector {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 8px;
      margin-bottom: 16px;
    }
    .slot-pill {
      font-size: 0.8125rem;
      padding: 8px;
      text-align: center;
      background: #f1f5f9;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      cursor: pointer;
    }
    .slot-pill.active {
      border-color: var(--accent);
      background-color: #e0f2fe;
      color: var(--accent);
      font-weight: 600;
    }

    /* 2. 倒计时与阶段推进 */
    .countdown-bar {
      background-color: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
    }
    .countdown-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .countdown-title {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
      font-size: 0.9375rem;
    }
    .countdown-title svg {
      width: 20px;
      height: 20px;
      fill: var(--warning);
    }
    .countdown-timer {
      display: flex;
      gap: 12px;
      font-family: var(--font-mono);
    }
    .time-node {
      background: #0f172a;
      color: #fff;
      padding: 4px 8px;
      border-radius: 4px;
      font-size: 0.875rem;
      font-weight: 700;
    }

    /* 3. 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px 28px;
      position: relative;
      transition: var(--transition);
    }
    .pain-card:hover {
      border-color: var(--warning);
      box-shadow: var(--shadow-sm);
    }
    .pain-icon {
      width: 44px;
      height: 44px;
      border-radius: 4px;
      background-color: #fef3c7;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .pain-icon svg {
      width: 22px;
      height: 22px;
      fill: var(--warning);
    }
    .pain-card h3 {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .pain-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 4. 技术与系统概述 */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .overview-img-wrap {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      position: relative;
    }
    .overview-img-wrap img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .overview-feature-list {
      list-style: none;
      margin-top: 24px;
    }
    .overview-feature-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
    }
    .check-icon {
      width: 18px;
      height: 18px;
      fill: var(--accent);
      flex-shrink: 0;
      margin-top: 3px;
    }

    /* 5. 核心技术优势矩阵 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: var(--transition);
    }
    .advantage-card:hover {
      border-color: var(--accent);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }
    .adv-icon {
      width: 40px;
      height: 40px;
      border-radius: 4px;
      background: #e0f2fe;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
    }
    .adv-icon svg {
      width: 22px;
      height: 22px;
      fill: var(--accent);
    }
    .advantage-card h3 {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .advantage-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 6. 产品与套件 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
    }
    .product-thumb {
      height: 200px;
      overflow: hidden;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.04);
    }
    .product-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      font-size: 0.75rem;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 6px;
    }
    .product-title {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .product-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      flex: 1;
    }
    .product-meta {
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 7. 部署与作业流程 */
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 20px;
      position: relative;
    }
    .step-num {
      font-family: var(--font-mono);
      font-size: 1.75rem;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 12px;
      line-height: 1;
    }
    .step-item h3 {
      font-size: 1.0625rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 8. 实景案例与对比 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background-color: #111827;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }
    .case-card:hover {
      border-color: rgba(2, 132, 199, 0.4);
    }
    .case-thumb {
      height: 180px;
    }
    .case-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-body {
      padding: 24px;
    }
    .case-body h3 {
      font-size: 1.125rem;
      font-weight: 600;
      color: #ffffff;
      margin-bottom: 10px;
    }
    .case-body p {
      font-size: 0.875rem;
      color: var(--text-light);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .case-stat {
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      color: #38bdf8;
      border-left: 2px solid var(--accent);
      padding-left: 8px;
    }

    /* 9. 数据指标条 */
    .metrics-section {
      background-color: var(--primary);
      color: #ffffff;
      padding: 64px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-num {
      font-family: var(--font-mono);
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 700;
      color: #38bdf8;
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 0.875rem;
      color: var(--text-light);
    }

    /* 10. 用户口碑证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-text {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 24px;
      position: relative;
    }
    .author-info {
      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);
      font-size: 0.875rem;
    }
    .author-name {
      font-size: 0.9375rem;
      font-weight: 600;
    }
    .author-title {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 11. 行业动态与算法资讯 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .insight-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: var(--transition);
    }
    .insight-card:hover {
      border-color: var(--accent);
      transform: translateY(-2px);
    }
    .insight-date {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .insight-card h3 {
      font-size: 1.0625rem;
      font-weight: 600;
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .insight-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 12. 常见问题手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    details.faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 12px;
      padding: 16px 24px;
      transition: var(--transition);
    }
    details.faq-item[open] {
      border-color: var(--accent);
      box-shadow: var(--shadow-sm);
    }
    summary.faq-question {
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      outline: none;
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    .faq-icon {
      font-family: var(--font-mono);
      font-size: 1.25rem;
      color: var(--text-light);
      transition: transform 0.2s;
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }
    .faq-answer {
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px solid #f1f5f9;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 13. 底部咨询收口 CTA */
    .cta-section {
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 60px 48px;
      border: 1px solid var(--border-dark);
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .cta-info h2 {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.2;
    }
    .cta-info p {
      font-size: 0.9375rem;
      color: #cbd5e1;
      line-height: 1.65;
      margin-bottom: 24px;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .cta-input {
      width: 100%;
      padding: 12px 16px;
      border-radius: 4px;
      border: 1px solid rgba(255, 255, 255, 0.15);
      background: rgba(255, 255, 255, 0.05);
      color: #ffffff;
      font-size: 0.9375rem;
      outline: none;
    }
    .cta-input:focus {
      border-color: var(--accent);
      background: rgba(255, 255, 255, 0.1);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0b1120;
      color: #94a3b8;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 64px 0 32px;
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.65;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      color: #ffffff;
      font-size: 0.9375rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
    }

    /* 移动端菜单开关 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle svg {
      width: 24px;
      height: 24px;
      fill: var(--primary);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .overview-grid {
        grid-template-columns: 1fr;
      }
      .cta-section {
        grid-template-columns: 1fr;
      }
      .workflow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 24px;
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .section-spacing {
        padding: 64px 0;
      }
      .pain-grid, .product-grid, .cases-grid, .testimonial-grid, .insights-grid {
        grid-template-columns: 1fr;
      }
      .advantage-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .countdown-inner {
        flex-direction: column;
        align-items: flex-start;
      }
      .hero-specs-row {
        flex-direction: column;
        gap: 16px;
      }
    }