/* roulang page: index */
:root {
      --bg-dark: #070c18;
      --bg-card: rgba(15, 23, 42, 0.72);
      --bg-card-hover: rgba(26, 38, 66, 0.85);
      --primary: #00e5ff;
      --primary-glow: rgba(0, 229, 255, 0.45);
      --primary-dark: #0098b3;
      --secondary: #3b82f6;
      --accent: #10b981;
      --text-main: #f1f5f9;
      --text-muted: #94a3b8;
      --text-dim: #64748b;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 229, 255, 0.35);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    ul, ol {
      list-style: none;
    }

    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: 100;
      background: rgba(7, 12, 24, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-subtle);
      transition: all 0.3s ease;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: #fff;
    }

    .brand-logo-icon {
      width: 34px;
      height: 34px;
      border-radius: 8px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #070c18;
      font-weight: 900;
      box-shadow: 0 0 16px var(--primary-glow);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .nav-link {
      font-size: 0.95rem;
      color: var(--text-muted);
      transition: color 0.2s ease;
      position: relative;
      padding: 6px 0;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }

    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #00b4d8);
      color: #050b14;
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0, 229, 255, 0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.04);
      border-color: var(--border-subtle);
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0, 229, 255, 0.06);
    }

    /* 通用板块外框 */
    .section-block {
      padding: 86px 0;
      position: relative;
    }

    .section-alt {
      background: linear-gradient(180deg, rgba(15, 23, 42, 0.45) 0%, rgba(7, 12, 24, 0.8) 100%);
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }

    .section-header {
      margin-bottom: 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary);
      background: rgba(0, 229, 255, 0.1);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
      border: 1px solid rgba(0, 229, 255, 0.2);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 14px;
      color: #fff;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.7;
    }

    /* 1. 首屏板块 */
    .hero-section {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(0, 229, 255, 0.09) 0%, transparent 60%),
                  radial-gradient(circle at 10% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
                  url('/assets/images/d9902aec001638a3.webp') center/cover no-repeat;
      position: relative;
      border-bottom: 1px solid var(--border-subtle);
    }

    .hero-overlay {
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(7, 12, 24, 0.88);
      z-index: 1;
    }

    .hero-container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.9rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-content h1 span {
      background: linear-gradient(90deg, #fff 20%, var(--primary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 首屏右侧玻璃拟态看板 */
    .hero-dashboard-card {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(20px);
    }

    .dashboard-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--border-subtle);
      padding-bottom: 14px;
      margin-bottom: 18px;
    }

    .indicator-group {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      color: var(--primary);
    }

    .dot-live {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-bottom: 20px;
    }

    .metric-pill {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-subtle);
      padding: 12px 14px;
      border-radius: var(--radius-sm);
    }

    .metric-label {
      font-size: 0.75rem;
      color: var(--text-dim);
      margin-bottom: 4px;
    }

    .metric-val {
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
      font-family: monospace;
    }

    .bus-stream-panel {
      background: rgba(0, 0, 0, 0.45);
      border: 1px solid rgba(0, 229, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 14px;
      font-family: monospace;
      font-size: 0.78rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .stream-row {
      display: flex;
      justify-content: space-between;
      border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
      padding: 3px 0;
    }

    .stream-row span.tx { color: #38bdf8; }
    .stream-row span.rx { color: #4ade80; }

    /* 2. 诊断服务与总线矩阵 4列卡片 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .matrix-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
    }

    .matrix-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 229, 255, 0.12);
    }

    .card-badge {
      position: absolute;
      top: 18px;
      right: 18px;
      font-size: 0.7rem;
      background: rgba(0, 229, 255, 0.12);
      color: var(--primary);
      padding: 3px 8px;
      border-radius: 4px;
    }

    .matrix-icon {
      font-size: 1.6rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .matrix-card h3 {
      font-size: 1.15rem;
      margin-bottom: 10px;
      color: #fff;
    }

    .matrix-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
      margin-bottom: 16px;
    }

    .tag-cluster {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .mini-tag {
      font-size: 0.72rem;
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-muted);
      padding: 2px 7px;
      border-radius: 4px;
    }

    /* 3. 研发实力与技术参数说明 */
    .profile-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .profile-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-glow);
      position: relative;
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
    }

    .profile-info h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
      color: #fff;
    }

    .profile-info p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 0.95rem;
    }

    .specs-table {
      width: 100%;
      border-collapse: collapse;
      margin-bottom: 24px;
    }

    .specs-table th, .specs-table td {
      padding: 12px 14px;
      text-align: left;
      font-size: 0.88rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .specs-table th {
      color: var(--text-dim);
      font-weight: 500;
      width: 38%;
    }

    .specs-table td {
      color: #fff;
      font-weight: 600;
    }

    /* 4. 六维研发优势 2x3 卡片 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
    }

    .adv-card:hover {
      border-color: var(--border-glow);
      background: var(--bg-card-hover);
      transform: translateY(-3px);
    }

    .adv-num {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 12px;
      font-family: monospace;
    }

    .adv-card h3 {
      font-size: 1.15rem;
      color: #fff;
      margin-bottom: 10px;
    }

    .adv-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 5. 热门套件对比 3列 */
    .suites-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .suite-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: all 0.3s ease;
    }

    .suite-card.highlight {
      border-color: var(--primary);
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.15);
      background: linear-gradient(180deg, rgba(15, 23, 42, 0.9) 0%, rgba(10, 18, 35, 0.8) 100%);
    }

    .suite-ribbon {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #070c18;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
      letter-spacing: 0.5px;
    }

    .suite-title {
      font-size: 1.4rem;
      color: #fff;
      margin-bottom: 6px;
    }

    .suite-sub {
      font-size: 0.85rem;
      color: var(--text-dim);
      margin-bottom: 20px;
    }

    .suite-features {
      margin: 20px 0;
      flex-grow: 1;
    }

    .suite-feature-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .suite-feature-item span.icon {
      color: var(--primary);
      font-weight: bold;
    }

    /* 6. 前后效能基准对比看板 */
    .benchmark-container {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 36px;
    }

    .benchmark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .benchmark-col {
      padding: 24px;
      border-radius: var(--radius-md);
    }

    .benchmark-col.old {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid rgba(255, 255, 255, 0.06);
    }

    .benchmark-col.new {
      background: rgba(0, 229, 255, 0.04);
      border: 1px solid rgba(0, 229, 255, 0.25);
    }

    .bench-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .bench-meter {
      margin-bottom: 18px;
    }

    .bench-meta {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      margin-bottom: 6px;
    }

    .bar-wrap {
      width: 100%;
      height: 8px;
      background: rgba(255, 255, 255, 0.08);
      border-radius: 4px;
      overflow: hidden;
    }

    .bar-fill {
      height: 100%;
      border-radius: 4px;
    }

    .bar-old { background: #64748b; }
    .bar-new { background: linear-gradient(90deg, #00e5ff, #38bdf8); }

    /* 7. 汽车软件开发生命周期流程板块 */
    .lifecycle-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-badge {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: rgba(0, 229, 255, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 14px;
      border: 1px solid rgba(0, 229, 255, 0.3);
    }

    .step-card h3 {
      font-size: 1.1rem;
      color: #fff;
      margin-bottom: 10px;
    }

    .step-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 8. 汽车电子行业场景矩阵 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scenario-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .scenario-card:hover {
      border-color: var(--border-glow);
    }

    .scenario-img {
      height: 160px;
      width: 100%;
      object-fit: cover;
    }

    .scenario-body {
      padding: 22px;
    }

    .scenario-body h3 {
      font-size: 1.15rem;
      color: #fff;
      margin-bottom: 8px;
    }

    .scenario-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }

    /* 9. 汽车软件技术资讯与发布动态 */
    .news-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 28px;
    }

    .news-featured {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
    }

    .featured-img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .featured-text {
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .news-date {
      font-size: 0.78rem;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .featured-text h3 {
      font-size: 1.25rem;
      color: #fff;
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .featured-text p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 18px;
    }

    .news-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .news-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      transition: border-color 0.2s ease;
    }

    .news-item:hover {
      border-color: var(--border-glow);
    }

    .news-item h4 {
      font-size: 0.95rem;
      color: #fff;
      margin-bottom: 6px;
    }

    .news-item p {
      font-size: 0.8rem;
      color: var(--text-dim);
    }

    /* 10. 工业标准合规与可信平台保障 */
    .compliance-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .comp-box {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 22px;
      text-align: center;
    }

    .comp-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 8px;
    }

    .comp-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 11. 软硬件生态与兼容总线指标 */
    .bus-compat-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
    }

    .bus-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 16px 12px;
      text-align: center;
      transition: all 0.25s ease;
    }

    .bus-card:hover {
      border-color: var(--primary);
      box-shadow: 0 4px 16px rgba(0, 229, 255, 0.15);
    }

    .bus-name {
      font-size: 1rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 4px;
    }

    .bus-rate {
      font-size: 0.76rem;
      color: var(--primary);
      font-family: monospace;
    }

    /* 12. 研发测试高频技术解答 (FAQ) */
    .faq-layout {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: border-color 0.25s ease;
    }

    .faq-item:hover {
      border-color: rgba(0, 229, 255, 0.3);
    }

    .faq-q {
      font-size: 1.05rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .faq-q::before {
      content: "Q";
      color: var(--primary);
      font-weight: 900;
    }

    .faq-a {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.7;
      padding-left: 24px;
    }

    /* 13. 试用申请与联络收口表单 */
    .form-panel {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.9) 0%, rgba(10, 18, 35, 0.9) 100%);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
      max-width: 980px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 24px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full {
      grid-column: span 2;
    }

    .form-label {
      font-size: 0.85rem;
      color: var(--text-main);
      font-weight: 500;
    }

    .form-control {
      background: rgba(7, 12, 24, 0.7);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: #fff;
      font-size: 0.92rem;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.25);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 页脚 */
    .site-footer {
      background: #040810;
      border-top: 1px solid var(--border-subtle);
      padding: 60px 0 30px;
      color: var(--text-dim);
      font-size: 0.85rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-desc {
      color: var(--text-muted);
      line-height: 1.7;
      margin-top: 14px;
      font-size: 0.88rem;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 0.95rem;
      margin-bottom: 16px;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: var(--text-muted);
      transition: color 0.2s ease;
    }

    .footer-col ul li a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .matrix-grid { grid-template-columns: repeat(2, 1fr); }
      .advantage-grid { grid-template-columns: repeat(2, 1fr); }
      .suites-grid { grid-template-columns: 1fr; }
      .lifecycle-steps { grid-template-columns: repeat(2, 1fr); }
      .scenarios-grid { grid-template-columns: 1fr; }
      .bus-compat-grid { grid-template-columns: repeat(3, 1fr); }
      .compliance-bar { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .hero-container { grid-template-columns: 1fr; }
      .profile-layout { grid-template-columns: 1fr; }
      .benchmark-grid { grid-template-columns: 1fr; }
      .news-grid { grid-template-columns: 1fr; }
      .news-featured { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full { grid-column: span 1; }
      .hero-content h1 { font-size: 2.1rem; }
      .nav-links { display: none; }
      .section-block { padding: 60px 0; }
    }

    @media (max-width: 520px) {
      .matrix-grid { grid-template-columns: 1fr; }
      .advantage-grid { grid-template-columns: 1fr; }
      .lifecycle-steps { grid-template-columns: 1fr; }
      .bus-compat-grid { grid-template-columns: repeat(2, 1fr); }
      .compliance-bar { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .form-panel { padding: 24px 16px; }
    }