/* roulang page: index */
:root {
      --primary: #7022C4;
      --primary-light: #8E3FF3;
      --primary-dark: #4F1293;
      --accent: #00D2B4;
      --accent-hover: #00B39A;
      --bg-surface: #F7F8FC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B0C16;
      --bg-dark-card: #151829;
      --text-main: #161823;
      --text-sub: #5E6278;
      --text-muted: #8E93A6;
      --border-color: #E4E6EF;
      --border-dark: #23273E;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(22, 24, 35, 0.04);
      --shadow-md: 0 10px 30px -5px rgba(22, 24, 35, 0.08);
      --shadow-lg: 0 20px 40px -10px rgba(112, 34, 196, 0.15);
      --max-width: 1200px;
      --transition: all 0.28s ease;
    }

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

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-surface);
      line-height: 1.75;
      overflow-x: hidden;
    }

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

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

    ul, ol {
      list-style: none;
    }

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

    /* 顶部信息条 */
    .top-bar {
      background: #111222;
      color: #A5A8BD;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-status {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .status-pulse {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
      animation: pulseDot 2s infinite;
    }
    @keyframes pulseDot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }
    .top-links {
      display: flex;
      gap: 20px;
    }
    .top-links span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 主导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-symbol {
      width: 42px;
      height: 42px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-weight: 800;
      font-size: 20px;
      box-shadow: 0 4px 12px rgba(112, 34, 196, 0.3);
    }
    .logo-text {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .logo-tagline {
      font-size: 11px;
      color: var(--text-muted);
      letter-spacing: 0.8px;
      text-transform: uppercase;
      display: block;
      margin-top: -2px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-sub);
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
      min-height: 44px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #FFF;
      box-shadow: 0 6px 16px rgba(112, 34, 196, 0.28);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(112, 34, 196, 0.38);
    }
    .btn-accent {
      background: var(--accent);
      color: #072F29;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--border-color);
      background: #FFF;
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 通用板块样式 */
    .section-wrap {
      padding: 86px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #FFF;
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-light {
      background-color: var(--bg-surface);
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-header.text-center {
      text-align: center;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary);
      margin-bottom: 12px;
      background: rgba(112, 34, 196, 0.08);
      padding: 4px 12px;
      border-radius: 30px;
    }
    .section-dark .eyebrow {
      color: var(--accent);
      background: rgba(0, 210, 180, 0.12);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-sub);
      max-width: 780px;
      line-height: 1.8;
      text-align: left;
    }
    .section-header.text-center .section-desc {
      margin-left: auto;
      margin-right: auto;
    }
    .section-dark .section-desc {
      color: #A0A4BE;
    }

    /* 1. 斜切色块首屏 (#hero) */
    .hero-angled {
      position: relative;
      background: #0D0E1A;
      color: #FFF;
      padding: 100px 0 130px;
      overflow: hidden;
    }
    .hero-bg-layer {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      opacity: 0.18;
      background-image: url('/assets/images/8aa71c155764fa21.png');
      background-size: cover;
      background-position: center;
      mix-blend-mode: overlay;
    }
    .hero-slant {
      position: absolute;
      bottom: -60px;
      left: -5%;
      width: 110%;
      height: 120px;
      background: var(--bg-surface);
      transform: rotate(-2.2deg);
      z-index: 10;
    }
    .hero-content {
      position: relative;
      z-index: 5;
      max-width: 860px;
    }
    .hero-badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, rgba(112, 34, 196, 0.4), rgba(0, 210, 180, 0.2));
      border: 1px solid rgba(0, 210, 180, 0.35);
      border-radius: 40px;
      padding: 6px 18px;
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 24px;
    }
    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -1px;
    }
    .hero-h1 span {
      background: linear-gradient(135deg, #FFF 40%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 16px;
      line-height: 1.85;
      color: #CAD0E4;
      margin-bottom: 34px;
      text-align: left;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .hero-highlight-specs {
      display: flex;
      gap: 32px;
      margin-top: 48px;
      padding-top: 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }
    .spec-item h4 {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 4px;
    }
    .spec-item p {
      font-size: 13px;
      color: #9297B4;
    }

    /* 2. 入口矩阵 (#portals) */
    .portal-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }
    .portal-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .portal-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(112, 34, 196, 0.3);
    }
    .portal-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(112, 34, 196, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 20px;
    }
    .portal-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .portal-desc {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .portal-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 3. 最新动态与实时调度观察 (#dispatch-news) */
    .news-dispatch-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: center;
    }
    .dispatch-monitor-card {
      background: #0B0D19;
      border-radius: var(--radius-md);
      padding: 30px;
      color: #FFF;
      border: 1px solid #1E233E;
    }
    .monitor-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #1C223A;
      padding-bottom: 14px;
      margin-bottom: 18px;
    }
    .monitor-stream-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .stream-row {
      background: rgba(255, 255, 255, 0.04);
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }
    .stream-name {
      font-weight: 600;
      color: #CAD0E8;
    }
    .stream-badge {
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 11px;
      font-weight: 600;
      background: rgba(0, 210, 180, 0.15);
      color: var(--accent);
    }
    .dynamic-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .dynamic-item {
      padding-left: 18px;
      border-left: 3px solid var(--primary);
    }
    .dynamic-meta {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 4px;
    }
    .dynamic-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .dynamic-brief {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 4. 精选分类 (#categories) */
    .category-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }
    .category-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .category-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .cat-thumb-wrap {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .cat-thumb-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .category-card:hover .cat-thumb-wrap img {
      transform: scale(1.05);
    }
    .cat-tag {
      position: absolute;
      top: 14px;
      right: 14px;
      background: rgba(11, 12, 22, 0.75);
      backdrop-filter: blur(8px);
      color: #FFF;
      font-size: 11px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .cat-body {
      padding: 24px;
    }
    .cat-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .cat-desc {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .cat-metrics {
      display: flex;
      justify-content: space-between;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 5. 核心优势矩阵 (#features) */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-box {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      transition: var(--transition);
      position: relative;
    }
    .feature-box:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .feature-pill {
      display: inline-block;
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      background: rgba(112, 34, 196, 0.1);
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .feature-text {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.75;
    }

    /* 6. 技术底座与实测凭证 (#about-engine) */
    .engine-proof-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .engine-proof-text .section-title {
      margin-bottom: 20px;
    }
    .proof-badge-box {
      background: #F1F4FA;
      border-left: 4px solid var(--accent);
      padding: 16px 20px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      margin: 24px 0;
      font-size: 14px;
      line-height: 1.75;
      color: #2D3148;
    }
    .proof-badge-box strong {
      color: #0E685C;
    }
    .engine-visual {
      background: #0E101D;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid #232742;
      color: #FFF;
      box-shadow: var(--shadow-lg);
    }
    .tech-pipeline {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .pipeline-step {
      display: flex;
      align-items: center;
      gap: 16px;
      background: rgba(255, 255, 255, 0.03);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.06);
    }
    .step-num {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
    }
    .step-content h5 {
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 2px;
    }
    .step-content p {
      font-size: 12px;
      color: #9AA0BF;
    }

    /* 7. 深色管线与计算理念 (#technology) */
    .tech-flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .flow-node {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      position: relative;
    }
    .flow-node::after {
      content: '→';
      position: absolute;
      right: -14px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--accent);
      font-size: 18px;
      font-weight: 700;
    }
    .flow-node:last-child::after {
      display: none;
    }
    .node-latency {
      font-size: 11px;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 8px;
      letter-spacing: 0.5px;
    }
    .node-title {
      font-size: 17px;
      font-weight: 700;
      color: #FFF;
      margin-bottom: 8px;
    }
    .node-desc {
      font-size: 13px;
      color: #8C92B0;
      line-height: 1.7;
    }

    /* 8. 标杆场景故事 (#stories) */
    .story-card-large {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      align-items: center;
      margin-bottom: 30px;
    }
    .story-card-large.reverse {
      direction: rtl;
    }
    .story-card-large.reverse .story-inner {
      direction: ltr;
    }
    .story-media img {
      width: 100%;
      height: 100%;
      min-height: 320px;
      object-fit: cover;
    }
    .story-inner {
      padding: 40px;
    }
    .story-quote {
      font-size: 15px;
      line-height: 1.8;
      color: var(--text-sub);
      margin-bottom: 24px;
      font-style: normal;
    }
    .story-result-chips {
      display: flex;
      gap: 16px;
    }
    .result-chip {
      background: #F4F6FC;
      border-radius: var(--radius-sm);
      padding: 8px 14px;
    }
    .result-chip strong {
      display: block;
      font-size: 18px;
      color: var(--primary);
      font-weight: 800;
    }
    .result-chip span {
      font-size: 11px;
      color: var(--text-muted);
    }

    /* 9. 运行数据与性能指标 (#metrics) */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: linear-gradient(135deg, #101223, #1B1E38);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      border: 1px solid #282D4F;
      color: #FFF;
    }
    .metric-item {
      text-align: center;
      position: relative;
    }
    .metric-item:not(:last-child)::after {
      content: '';
      position: absolute;
      right: 0;
      top: 15%;
      height: 70%;
      width: 1px;
      background: rgba(255, 255, 255, 0.1);
    }
    .metric-value {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
      background: linear-gradient(135deg, #FFF 30%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .metric-label {
      font-size: 15px;
      font-weight: 600;
      color: #CAD0E8;
      margin-bottom: 4px;
    }
    .metric-caption {
      font-size: 12px;
      color: #7E85A8;
    }

    /* 10. 资讯动态与技术周报 (#insights) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(112, 34, 196, 0.25);
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 14px;
    }
    .news-badge {
      font-size: 11px;
      font-weight: 700;
      color: var(--primary);
      background: rgba(112, 34, 196, 0.08);
      padding: 3px 8px;
      border-radius: 4px;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.45;
    }
    .news-summary {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .news-arrow-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 11. 版本更新与运行演进 (#releases) */
    .release-timeline {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .release-item {
      display: grid;
      grid-template-columns: 140px 1fr;
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 24px 28px;
      border: 1px solid var(--border-color);
      align-items: start;
    }
    .release-tag-box {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .release-ver {
      font-size: 16px;
      font-weight: 800;
      color: var(--primary);
    }
    .release-time {
      font-size: 12px;
      color: var(--text-muted);
    }
    .release-detail h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .release-detail p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 12. 多端同步架构 (#multi-platform) */
    .devices-display-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .device-box {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .device-box:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    .device-icon-wrap {
      width: 56px;
      height: 56px;
      border-radius: 16px;
      background: linear-gradient(135deg, rgba(112, 34, 196, 0.1), rgba(0, 210, 180, 0.1));
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 700;
      margin: 0 auto 18px;
    }
    .device-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .device-desc {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 13. 快速解答 FAQ 手风琴 (#faq) */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 26px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 16px;
      font-weight: 600;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-indicator {
      font-size: 20px;
      font-weight: 400;
      color: var(--text-muted);
      transition: transform 0.25s ease;
    }
    .faq-card.active .faq-indicator {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #FAFBFE;
      padding: 0 26px;
    }
    .faq-card.active .faq-answer {
      max-height: 200px;
      padding: 0 26px 20px;
    }
    .faq-answer p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.8;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    /* 14. 平台保障承诺条 (#guarantee) */
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-cell {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .guarantee-tag {
      font-size: 11px;
      font-weight: 700;
      color: var(--accent);
      background: #0E1D22;
      display: inline-block;
      align-self: flex-start;
      padding: 3px 8px;
      border-radius: 4px;
    }
    .guarantee-title {
      font-size: 16px;
      font-weight: 700;
    }
    .guarantee-text {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 15. 底部收口行动区与表单 (#contact) */
    .cta-container {
      background: linear-gradient(135deg, #4A1286 0%, #7022C4 60%, #300C5E 100%);
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      color: #FFF;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .cta-info h2 {
      font-size: 2.2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
    }
    .cta-info p {
      font-size: 15px;
      color: #E2CEF7;
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .cta-quick-contacts {
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      color: #F1E5FD;
    }
    .cta-form-box {
      background: rgba(255, 255, 255, 0.96);
      border-radius: var(--radius-md);
      padding: 34px 28px;
      color: var(--text-main);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    }
    .cta-form-box h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 18px;
      text-align: center;
    }
    .form-group {
      margin-bottom: 14px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-input, .form-select {
      width: 100%;
      height: 44px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 0 14px;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: #FFF;
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(112, 34, 196, 0.15);
    }

    /* 页脚系统 */
    .site-footer {
      background: #090A13;
      color: #8D93AD;
      font-size: 14px;
      padding-top: 70px;
      padding-bottom: 30px;
      border-top: 1px solid #1A1D2E;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand .brand-logo {
      margin-bottom: 18px;
    }
    .footer-brand .logo-text {
      color: #FFF;
    }
    .footer-intro {
      font-size: 14px;
      line-height: 1.8;
      color: #8C93AF;
      margin-bottom: 20px;
    }
    .footer-col h4 {
      color: #FFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-meta-info {
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 13px;
      color: #838AA4;
    }
    .footer-bottom {
      border-top: 1px solid #161826;
      padding-top: 26px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #6C728E;
    }

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .portal-grid { grid-template-columns: repeat(2, 1fr); }
      .category-grid, .news-grid, .devices-display-grid { grid-template-columns: repeat(2, 1fr); }
      .tech-flow-grid { grid-template-columns: repeat(2, 1fr); }
      .tech-flow-grid .flow-node:nth-child(2)::after { display: none; }
      .metrics-bar { grid-template-columns: repeat(2, 1fr); gap: 30px; }
      .metrics-bar .metric-item:nth-child(2)::after { display: none; }
      .guarantee-bar { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .top-links { display: none; }
      .nav-menu { display: none; }
      .mobile-toggle { display: block; }
      .hero-h1 { font-size: 2.1rem; }
      .news-dispatch-layout, .engine-proof-layout, .story-card-large, .cta-container { grid-template-columns: 1fr; }
      .category-grid, .feature-grid, .news-grid, .devices-display-grid, .guarantee-bar { grid-template-columns: 1fr; }
      .hero-highlight-specs { flex-direction: column; gap: 16px; }
      .release-item { grid-template-columns: 1fr; gap: 8px; }
      .metrics-bar { grid-template-columns: 1fr; }
      .metrics-bar .metric-item::after { display: none; }
      .cta-container { padding: 36px 20px; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    }