/* roulang page: index */
:root {
      --primary: #1e40af;
      --primary-hover: #1d4ed8;
      --primary-dark: #0f172a;
      --accent: #2563eb;
      --accent-light: #eff6ff;
      --accent-border: #bfdbfe;
      --success: #10b981;
      --text-main: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --bg-main: #f8fafc;
      --bg-white: #ffffff;
      --bg-slate: #0b132b;
      --border-color: #e2e8f0;
      --border-focus: #3b82f6;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --shadow-hover: 0 20px 25px -5px rgba(30, 64, 175, 0.12), 0 8px 10px -6px rgba(30, 64, 175, 0.08);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    }

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

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-main);
      color: var(--text-body);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部服务信息条 */
    .top-bar {
      background: #0f172a;
      color: #94a3b8;
      font-size: 13px;
      border-bottom: 1px solid #1e293b;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 38px;
    }
    .top-bar-meta {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .top-bar-link {
      color: #cbd5e1;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .top-bar-link:hover {
      color: #ffffff;
    }
    .status-probe {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #cbd5e1;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: var(--success);
      border-radius: 50%;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
      100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }

    /* 主导航 */
    .header-main {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 20px;
      color: var(--text-main);
    }
    .brand-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--accent), var(--primary));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 800;
      font-size: 18px;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-item a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .nav-item a:hover {
      color: var(--accent);
    }
    .nav-btn {
      display: inline-flex;
      align-items: center;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      background: var(--accent);
      color: #ffffff !important;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .nav-btn:hover {
      background: var(--primary);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    /* Section 通用规范 */
    .section-wrap {
      padding: 90px 0;
    }
    .section-light {
      background-color: var(--bg-main);
    }
    .section-white {
      background-color: var(--bg-white);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-dark {
      background-color: var(--bg-slate);
      color: #f1f5f9;
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 10px;
      background: var(--accent-light);
      padding: 4px 12px;
      border-radius: 4px;
    }
    .section-dark .section-tag {
      background: rgba(37, 99, 235, 0.2);
      color: #60a5fa;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .section-dark .section-title {
      color: #ffffff;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }

    /* 板块 1: Hero (杂志分栏首屏) */
    .hero-section {
      padding: 60px 0 80px;
      background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }
    .hero-intro {
      font-size: 17px;
      line-height: 1.75;
      color: var(--text-body);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .btn-main {
      padding: 14px 28px;
      background: var(--accent);
      color: #ffffff;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid transparent;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
      transition: all 0.2s ease;
    }
    .btn-main:hover {
      background: var(--primary);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(30, 64, 175, 0.4);
    }
    .btn-ghost {
      padding: 14px 28px;
      background: #ffffff;
      color: var(--text-main);
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: inline-flex;
      align-items: center;
      transition: all 0.2s ease;
    }
    .btn-ghost:hover {
      background: var(--accent-light);
      border-color: var(--accent-border);
      color: var(--accent);
    }
    .hero-meta-points {
      display: flex;
      gap: 28px;
      padding-top: 24px;
      border-top: 1px solid #e2e8f0;
    }
    .meta-point-item {
      font-size: 13px;
      color: var(--text-muted);
    }
    .meta-point-item strong {
      display: block;
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 2px;
    }

    /* Hero 右侧精选卡片 */
    .hero-feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .terminal-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 12px;
      margin-bottom: 16px;
    }
    .terminal-dots {
      display: flex;
      gap: 6px;
    }
    .terminal-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .dot-red { background: #ef4444; }
    .dot-yellow { background: #f59e0b; }
    .dot-green { background: #10b981; }
    .terminal-title {
      font-size: 12px;
      font-family: var(--font-mono);
      color: #64748b;
    }
    .preview-canvas {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 16px;
      aspect-ratio: 16/9;
      background: #000;
    }
    .preview-canvas img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.9;
    }
    .overlay-badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(4px);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
      color: #38bdf8;
      font-family: var(--font-mono);
    }
    .overlay-latency {
      position: absolute;
      bottom: 12px;
      right: 12px;
      background: rgba(16, 185, 129, 0.9);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
      color: #ffffff;
      font-weight: 600;
    }
    .engine-metrics {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      background: #f8fafc;
      padding: 12px;
      border-radius: var(--radius-sm);
    }
    .metric-col small {
      display: block;
      font-size: 11px;
      color: #64748b;
      margin-bottom: 2px;
    }
    .metric-col span {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    /* 板块 2: 杂志资讯双栏排版（左资讯流 / 右热榜入口） */
    .stream-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr;
      gap: 40px;
    }
    .stream-post-item {
      display: flex;
      gap: 24px;
      padding: 24px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .stream-post-item:first-child {
      padding-top: 0;
    }
    .stream-img-box {
      width: 200px;
      height: 130px;
      flex-shrink: 0;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #e2e8f0;
    }
    .stream-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .stream-post-item:hover .stream-img-box img {
      transform: scale(1.05);
    }
    .stream-post-content {
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .stream-meta {
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 6px;
    }
    .stream-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
      line-height: 1.4;
    }
    .stream-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .rank-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .rank-card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 2px solid var(--accent);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .rank-list {
      list-style: none;
    }
    .rank-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      padding: 14px 0;
      border-bottom: 1px dashed var(--border-color);
    }
    .rank-item:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }
    .rank-num {
      width: 24px;
      height: 24px;
      border-radius: 4px;
      background: #f1f5f9;
      color: #64748b;
      font-size: 13px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .rank-item:nth-child(1) .rank-num { background: #ef4444; color: #fff; }
    .rank-item:nth-child(2) .rank-num { background: #f97316; color: #fff; }
    .rank-item:nth-child(3) .rank-num { background: #3b82f6; color: #fff; }
    .rank-info h4 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .rank-info p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块 3: 专题条 (长条横排展示) */
    .topics-strip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .topics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .topic-box {
      border-right: 1px solid var(--border-color);
      padding-right: 20px;
    }
    .topic-box:last-child {
      border-right: none;
      padding-right: 0;
    }
    .topic-badge {
      font-size: 11px;
      font-weight: 700;
      color: var(--accent);
      background: var(--accent-light);
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 8px;
      display: inline-block;
    }
    .topic-box h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .topic-box p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 4: 架构拆解 (Overview) */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-graphic {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-md);
    }
    .stack-layer {
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      padding: 16px 20px;
      margin-bottom: 12px;
      background: #f8fafc;
      transition: all 0.2s ease;
    }
    .stack-layer:hover {
      border-color: var(--accent);
      background: #eff6ff;
      transform: translateX(4px);
    }
    .stack-layer h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
    }
    .stack-layer p {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 4px;
    }
    .arch-list {
      list-style: none;
      margin-top: 24px;
    }
    .arch-list-item {
      display: flex;
      gap: 16px;
      margin-bottom: 20px;
    }
    .arch-icon-tag {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: var(--accent-light);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    /* 板块 5: 核心技术优势矩阵 (6卡片) */
    .feature-matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .matrix-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      position: relative;
    }
    .matrix-card:hover {
      border-color: var(--accent-border);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .matrix-icon-bar {
      font-size: 24px;
      margin-bottom: 16px;
      color: var(--accent);
    }
    .matrix-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .matrix-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .param-tag {
      display: inline-block;
      font-size: 12px;
      font-family: var(--font-mono);
      background: #f1f5f9;
      color: #475569;
      padding: 4px 8px;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
    }

    /* 板块 6: 试玩 API 产品系列 (3卡片横排) */
    .solution-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .solution-cover {
      height: 180px;
      overflow: hidden;
      background: #1e293b;
    }
    .solution-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .solution-card:hover .solution-cover img {
      transform: scale(1.05);
    }
    .solution-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .solution-body h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .solution-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex: 1;
    }
    .solution-specs {
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
      display: flex;
      justify-content: space-between;
      font-size: 12px;
      color: #64748b;
    }

    /* 板块 7: 深色沉浸式技术引擎 (#dark-engine) */
    .engine-terminal-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: center;
    }
    .code-window {
      background: #020617;
      border: 1px solid #1e293b;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    }
    .code-bar {
      background: #0f172a;
      padding: 10px 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #1e293b;
      font-family: var(--font-mono);
      font-size: 12px;
      color: #94a3b8;
    }
    .code-content {
      padding: 20px;
      color: #e2e8f0;
      font-family: var(--font-mono);
      font-size: 13px;
      line-height: 1.6;
      overflow-x: auto;
    }
    .code-token-func { color: #38bdf8; }
    .code-token-key { color: #f472b6; }
    .code-token-str { color: #4ade80; }
    .engine-spec-list {
      list-style: none;
    }
    .engine-spec-item {
      margin-bottom: 24px;
    }
    .engine-spec-item h4 {
      font-size: 16px;
      font-weight: 700;
      color: #38bdf8;
      margin-bottom: 6px;
    }
    .engine-spec-item p {
      font-size: 14px;
      color: #94a3b8;
      line-height: 1.6;
    }

    /* 板块 8: 客户成果与时间线 (#stories) */
    .case-timeline {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .case-tag {
      font-size: 12px;
      color: #f97316;
      font-weight: 700;
      background: #fff7ed;
      padding: 3px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .case-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .case-card p {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .case-timeline-steps {
      border-left: 2px solid #e2e8f0;
      padding-left: 16px;
      margin-left: 6px;
    }
    .step-item {
      position: relative;
      margin-bottom: 12px;
    }
    .step-item::before {
      content: "";
      position: absolute;
      left: -21px;
      top: 6px;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
    }
    .step-item strong {
      font-size: 13px;
      color: var(--text-main);
    }
    .step-item span {
      display: block;
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 板块 9: 关键运行数据指标条 (Stats Bar) */
    .stats-bar-inner {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 40px;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .stat-unit h3 {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-unit p {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-body);
      margin-bottom: 2px;
    }
    .stat-unit small {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 板块 10: 行业技术评价 (Testimonials) */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .quote-mark {
      font-size: 40px;
      line-height: 1;
      color: #cbd5e1;
      font-family: Georgia, serif;
      margin-bottom: 8px;
    }
    .testi-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .testi-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .testi-avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--accent);
      font-size: 14px;
    }
    .testi-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .testi-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 板块 11: 疑难解答 (#faq - 单列居中手风琴) */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .accordion-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .accordion-btn {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: transparent;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
    }
    .accordion-btn:hover {
      color: var(--accent);
    }
    .accordion-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: #94a3b8;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      background: #f8fafc;
    }
    .accordion-item.active {
      border-color: var(--accent-border);
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
      color: var(--accent);
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding: 16px 24px 24px;
    }

    /* 板块 12: 底部行动转化区 (#specs) */
    .cta-card {
      background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      text-align: center;
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .cta-card h2 {
      font-size: 34px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .cta-card p {
      font-size: 16px;
      color: #bfdbfe;
      max-width: 680px;
      margin: 0 auto 32px;
      line-height: 1.7;
    }
    .cta-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
    }
    .cta-btn-white {
      padding: 14px 32px;
      background: #ffffff;
      color: var(--primary);
      font-weight: 700;
      border-radius: var(--radius-sm);
      font-size: 15px;
      transition: all 0.2s ease;
    }
    .cta-btn-white:hover {
      background: #f1f5f9;
      transform: translateY(-2px);
    }
    .cta-btn-trans {
      padding: 14px 32px;
      background: rgba(255, 255, 255, 0.1);
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: #ffffff;
      font-weight: 600;
      border-radius: var(--radius-sm);
      font-size: 15px;
      transition: all 0.2s ease;
    }
    .cta-btn-trans:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      font-size: 14px;
      padding-top: 60px;
      padding-bottom: 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr repeat(3, 1fr);
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      color: #ffffff;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
      font-size: 13px;
    }
    .footer-col h5 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 18px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col li {
      margin-bottom: 10px;
    }
    .footer-col a {
      color: #94a3b8;
    }
    .footer-col a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
    }
    .footer-trust {
      display: flex;
      gap: 16px;
    }

    /* 移动端汉堡菜单 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--text-main);
      margin-bottom: 5px;
      transition: all 0.3s;
    }
    .mobile-toggle span:last-child {
      margin-bottom: 0;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .feature-matrix { grid-template-columns: repeat(2, 1fr); }
      .solution-cards { grid-template-columns: repeat(2, 1fr); }
      .topics-grid { grid-template-columns: repeat(2, 1fr); }
      .topic-box { border-right: none; margin-bottom: 16px; }
      .engine-terminal-grid { grid-template-columns: 1fr; }
      .stream-grid { grid-template-columns: 1fr; }
      .stats-bar-inner { grid-template-columns: repeat(2, 1fr); gap: 28px; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .mobile-toggle { display: block; }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
        gap: 16px;
      }
      .nav-menu.open { display: flex; }
      .hero-content h1 { font-size: 32px; }
      .section-title { font-size: 26px; }
      .feature-matrix { grid-template-columns: 1fr; }
      .solution-cards { grid-template-columns: 1fr; }
      .case-timeline { grid-template-columns: 1fr; }
      .testi-grid { grid-template-columns: 1fr; }
      .arch-grid { grid-template-columns: 1fr; }
      .stats-bar-inner { grid-template-columns: 1fr; }
      .cta-actions { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
      .stream-post-item { flex-direction: column; }
      .stream-img-box { width: 100%; height: 180px; }
    }