/* roulang page: index */
:root {
      --primary: #0F1923;
      --primary-dark: #070B0E;
      --accent: #00D26A;
      --accent-hover: #00B85C;
      --tech-blue: #2563EB;
      --bg-main: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #0B0F17;
      --bg-dark-card: #151D2A;
      --text-main: #020617;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-light: #E2E8F0;
      --border-color: #E2E8F0;
      --border-dark: #222F3E;
      --radius: 8px;
      --shadow-sm: 0 2px 8px -1px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 10px 30px -4px rgba(15, 23, 42, 0.12);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-main);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      -webkit-font-smoothing: antialiased;
    }

    body {
      line-height: 1.65;
      overflow-x: hidden;
    }

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

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

    button, input {
      font-family: inherit;
      outline: none;
    }

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

    /* 顶栏与主导航 */
    .top-bar {
      background-color: var(--primary-dark);
      color: var(--text-muted);
      font-size: 0.8125rem;
      border-bottom: 1px solid var(--border-dark);
      padding: 6px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-right: 20px;
    }
    .status-dot {
      width: 7px;
      height: 7px;
      background-color: var(--accent);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 8px var(--accent);
    }
    .top-bar-right {
      display: flex;
      gap: 16px;
    }

    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .main-nav {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.25rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-badge {
      background: var(--primary);
      color: var(--accent);
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--tech-blue);
    }
    .nav-btn-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      border-radius: var(--radius);
      font-size: 0.875rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent);
      color: var(--primary);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      box-shadow: 0 4px 14px rgba(0, 210, 106, 0.35);
    }
    .btn-dark {
      background-color: var(--primary);
      color: #FFFFFF;
    }
    .btn-dark:hover {
      background-color: #1a2735;
      box-shadow: 0 4px 14px rgba(15, 25, 35, 0.25);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border-color);
      color: var(--text-body);
    }
    .btn-outline:hover {
      border-color: var(--tech-blue);
      color: var(--tech-blue);
    }
    .btn-outline-light {
      background-color: transparent;
      border-color: var(--border-dark);
      color: var(--text-light);
    }
    .btn-outline-light:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    /* 移动端菜单开关 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--primary);
    }

    /* 板块共有规范 */
    .section {
      padding: 88px 0;
      position: relative;
    }
    .section-white {
      background-color: #FFFFFF;
    }
    .section-gray {
      background-color: var(--bg-main);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-light);
    }
    .section-header {
      margin-bottom: 56px;
      max-width: 780px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--tech-blue);
      margin-bottom: 12px;
      background: rgba(37, 99, 235, 0.08);
      padding: 4px 12px;
      border-radius: 4px;
    }
    .section-dark .section-tag {
      color: var(--accent);
      background: rgba(0, 210, 106, 0.12);
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      line-height: 1.28;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* Section 01: Hero API/开发者风格舞台 */
    .hero-section {
      background: #090E17 linear-gradient(135deg, rgba(15, 25, 35, 0.95) 0%, rgba(11, 15, 23, 0.98) 100%);
      color: #FFFFFF;
      padding: 96px 0 110px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/d1399eb396dd0be9.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 210, 106, 0.12);
      border: 1px solid rgba(0, 210, 106, 0.3);
      color: var(--accent);
      font-size: 0.8125rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.18;
      margin-bottom: 22px;
      letter-spacing: -1px;
    }
    .hero-title span {
      color: var(--accent);
    }
    .hero-lead {
      font-size: 1.0625rem;
      line-height: 1.8;
      color: #94A3B8;
      margin-bottom: 36px;
      max-width: 620px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .code-console {
      background: #020408;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
      overflow: hidden;
    }
    .code-console-header {
      background: #0A0F17;
      padding: 12px 16px;
      border-bottom: 1px solid var(--border-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .code-dots {
      display: flex;
      gap: 6px;
    }
    .code-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .code-dot.red { background: #EF4444; }
    .code-dot.yellow { background: #F59E0B; }
    .code-dot.green { background: #10B981; }
    .code-title {
      font-size: 0.75rem;
      color: #64748B;
      font-family: monospace;
    }
    .code-body {
      padding: 20px;
      font-family: "Courier New", Courier, monospace;
      font-size: 0.875rem;
      line-height: 1.6;
      color: #CBD5E1;
      overflow-x: auto;
    }
    .code-body .token-kw { color: #F43F5E; }
    .code-body .token-fn { color: #38BDF8; }
    .code-body .token-str { color: #34D399; }
    .code-body .token-cmt { color: #64748B; font-style: italic; }

    /* Section 02: 架构与品牌 */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .arch-preview {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-md);
    }
    .arch-layer {
      border: 1px dashed #CBD5E1;
      background: #F8FAFC;
      border-radius: 6px;
      padding: 16px;
      margin-bottom: 12px;
      text-align: center;
      transition: var(--transition);
    }
    .arch-layer:hover {
      border-color: var(--tech-blue);
      background: #EFF6FF;
    }
    .arch-layer-title {
      font-weight: 700;
      font-size: 0.9375rem;
      color: var(--primary);
    }
    .arch-layer-sub {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 4px;
    }
    .feature-list-inline {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .feature-item-inline {
      display: flex;
      gap: 14px;
    }
    .feature-icon-badge {
      width: 28px;
      height: 28px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--tech-blue);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
      font-size: 0.8125rem;
    }

    /* Section 03: 6卡片核心优势网格 */
    .card-grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .tech-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .tech-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .tech-card-icon {
      width: 48px;
      height: 48px;
      background: #0F1923;
      color: var(--accent);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 20px;
    }
    .tech-card-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .tech-card-text {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.65;
    }

    /* Section 04: 产品与中间件矩阵 (3卡大纵深) */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-deep-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-deep-card:hover {
      border-color: var(--tech-blue);
      box-shadow: var(--shadow-lg);
    }
    .product-img-wrap {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-deep-card:hover .product-img-wrap img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--tech-blue);
      margin-bottom: 8px;
      display: inline-block;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .product-desc {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.65;
      margin-bottom: 20px;
      flex: 1;
    }
    .spec-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .spec-badge {
      background: #F1F5F9;
      color: #475569;
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 500;
    }

    /* Section 05: 车规级安全认证展示 (深色反差) */
    .cert-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .cert-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition);
    }
    .cert-card:hover {
      border-color: var(--accent);
      transform: translateY(-3px);
    }
    .cert-level {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 8px;
      font-family: monospace;
    }
    .cert-name {
      font-size: 1rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 8px;
    }
    .cert-desc {
      font-size: 0.8125rem;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* Section 06: 多元化落地场景 (分栏展示) */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      background: #FFFFFF;
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .scenario-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .scenario-badge {
      width: 36px;
      height: 36px;
      background: #EFF6FF;
      color: var(--tech-blue);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }
    .scenario-card h3 {
      font-size: 1.125rem;
      color: var(--primary);
      font-weight: 700;
    }
    .scenario-body {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.65;
    }
    .scenario-tags {
      margin-top: 16px;
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }
    .scenario-tags span {
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      font-size: 0.75rem;
      padding: 2px 8px;
      border-radius: 3px;
      color: var(--text-muted);
    }

    /* Section 07: OEM 合作与工程落地案例 */
    .case-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
      box-shadow: var(--shadow-md);
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      min-height: 360px;
    }
    .case-content {
      padding: 48px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-stats {
      display: flex;
      gap: 24px;
      margin: 24px 0;
    }
    .case-stat-item h4 {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
    }
    .case-stat-item p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* Section 08: 关键性能与量产数据统计条 */
    .stats-bar-section {
      background: var(--primary);
      color: #FFFFFF;
      padding: 60px 0;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-box-val {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--accent);
      font-family: monospace;
      line-height: 1;
      margin-bottom: 8px;
    }
    .stat-box-label {
      font-size: 0.9375rem;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 4px;
    }
    .stat-box-desc {
      font-size: 0.75rem;
      color: #94A3B8;
    }

    /* Section 09: 客户与合作伙伴口碑墙 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
      font-size: 0.875rem;
    }
    .author-meta h5 {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--primary);
    }
    .author-meta p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* Section 10: 技术前瞻与行业快讯 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .news-img {
      height: 170px;
      overflow: hidden;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-content {
      padding: 20px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 6px;
    }
    .news-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-excerpt {
      font-size: 0.8125rem;
      color: var(--text-body);
      line-height: 1.6;
      flex: 1;
    }

    /* Section 11: 常见问题 FAQ */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item summary {
      padding: 20px 24px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: "+";
      font-size: 1.25rem;
      color: var(--text-muted);
      font-weight: normal;
    }
    .faq-item[open] summary::after {
      content: "-";
    }
    .faq-item[open] {
      border-color: var(--tech-blue);
    }
    .faq-content {
      padding: 0 24px 20px 24px;
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.7;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }

    /* Section 12: 开发者接入 CTA 转化区 */
    .cta-card-full {
      background: linear-gradient(135deg, #0F1923 0%, #172433 100%);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 60px 48px;
      color: #FFFFFF;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .cta-form-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 24px;
      border-radius: var(--radius);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-input {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-dark);
      background: #090E17;
      color: #FFFFFF;
      font-size: 0.875rem;
    }
    .form-input:focus {
      border-color: var(--accent);
    }

    /* 页脚 Footer */
    .site-footer {
      background: var(--primary-dark);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 64px 0 28px;
      border-top: 1px solid var(--border-dark);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 48px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-dark);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-grid, .case-container, .cta-card-full {
        grid-template-columns: 1fr;
      }
      .card-grid-6 {
        grid-template-columns: repeat(2, 1fr);
      }
      .cert-grid, .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 2.25rem;
      }
      .card-grid-6, .card-grid-3, .scenario-grid, .reviews-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .case-content {
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .cta-card-full {
        padding: 32px 20px;
      }
    }

    @media (max-width: 520px) {
      .cert-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 1.625rem;
      }
      .hero-title {
        font-size: 1.875rem;
      }
    }