/* roulang page: index */
:root {
      --bg-base: #0c0f14;
      --bg-surface: #141922;
      --bg-card: #161c28;
      --bg-card-hover: #1e2638;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 242, 254, 0.35);
      --primary: #00f2fe;
      --accent: #4facfe;
      --signal: #ff3366;
      --success: #00e676;
      --text-main: #f0f4f8;
      --text-muted: #8a99ad;
      --text-dark: #0a0d12;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --container-max: 1240px;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --transition-smooth: cubic-bezier(0.16, 1, 0.3, 1);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-base);
    }
    body {
      font-family: var(--font-stack);
      color: var(--text-main);
      background-color: var(--bg-base);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s var(--transition-smooth);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select, textarea {
      font-family: inherit;
      color: inherit;
      border: none;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(12, 15, 20, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-subtle);
      transition: border-color 0.3s ease;
    }
    .status-bar {
      background: rgba(8, 10, 14, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
      font-size: 12px;
      color: var(--text-muted);
      padding: 6px 0;
    }
    .status-bar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-items {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .pulse-dot {
      width: 7px;
      height: 7px;
      background-color: var(--success);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--success);
      animation: pulseGreen 2s infinite;
    }
    @keyframes pulseGreen {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }
    .main-nav-bar {
      padding: 16px 0;
    }
    .nav-flex {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 18px;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--text-main);
    }
    .brand-icon-box {
      width: 34px;
      height: 34px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, var(--primary), var(--accent));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: var(--text-dark);
      font-size: 16px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }
    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 0;
      position: relative;
    }
    .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 var(--transition-smooth);
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 11px 24px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.3s var(--transition-smooth);
      white-space: nowrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: var(--text-dark);
      box-shadow: 0 4px 16px rgba(0, 242, 254, 0.25);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 242, 254, 0.45);
    }
    .btn-outline {
      background: rgba(255, 255, 255, 0.03);
      color: var(--text-main);
      border: 1px solid var(--border-subtle);
    }
    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    /* Section通用结构 */
    section {
      padding: 96px 0;
      position: relative;
      border-bottom: 1px solid var(--border-subtle);
    }
    .section-alt {
      background-color: var(--bg-surface);
    }
    .section-head {
      margin-bottom: 48px;
      max-width: 760px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.12em;
      color: var(--primary);
      margin-bottom: 12px;
      background: rgba(0, 242, 254, 0.08);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      border: 1px solid rgba(0, 242, 254, 0.2);
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    /* 1. 首屏Hero：自测选型短问卷架构 */
    .hero-section {
      padding: 80px 0 100px;
      background: radial-gradient(circle at 80% 20%, rgba(79, 172, 254, 0.12) 0%, transparent 60%),
                  radial-gradient(circle at 20% 80%, rgba(0, 242, 254, 0.06) 0%, transparent 50%),
                  var(--bg-base);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.03em;
      margin-bottom: 24px;
      background: linear-gradient(135deg, #ffffff 40%, #8a99ad 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-summary {
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .hero-benchmark-row {
      display: flex;
      gap: 24px;
      margin-bottom: 36px;
      padding: 16px 20px;
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
    }
    .benchmark-item strong {
      display: block;
      font-size: 20px;
      color: var(--primary);
      font-weight: 700;
    }
    .benchmark-item span {
      font-size: 12px;
      color: var(--text-muted);
    }
    /* 选型测评卡片组件 */
    .eval-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
      position: relative;
    }
    .eval-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-subtle);
    }
    .eval-card-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
    }
    .eval-badge {
      font-size: 11px;
      padding: 3px 8px;
      border-radius: var(--radius-full);
      background: rgba(0, 242, 254, 0.1);
      color: var(--primary);
      border: 1px solid rgba(0, 242, 254, 0.25);
    }
    .eval-field {
      margin-bottom: 18px;
    }
    .eval-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .eval-select, .eval-input {
      width: 100%;
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      transition: all 0.25s ease;
    }
    .eval-select:focus, .eval-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 12px rgba(0, 242, 254, 0.2);
    }
    .eval-result-preview {
      background: rgba(0, 242, 254, 0.04);
      border: 1px dashed rgba(0, 242, 254, 0.3);
      padding: 14px;
      border-radius: var(--radius-sm);
      margin-bottom: 20px;
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .eval-result-preview b {
      color: var(--primary);
    }
    /* 2. 实时研发指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .metric-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: all 0.3s var(--transition-smooth);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-glow);
      box-shadow: 0 12px 30px rgba(0, 242, 254, 0.08);
    }
    .metric-val {
      font-size: 38px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.1;
      margin-bottom: 8px;
      font-family: monospace, var(--font-stack);
    }
    .metric-val span {
      font-size: 20px;
      color: var(--primary);
    }
    .metric-name {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    /* 3. 核心能力与底层引擎 */
    .engine-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .engine-media {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }
    .engine-media img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      filter: brightness(0.85);
      transition: transform 0.5s ease;
    }
    .engine-media:hover img {
      transform: scale(1.03);
    }
    .engine-media-tag {
      position: absolute;
      bottom: 16px;
      left: 16px;
      background: rgba(12, 15, 20, 0.85);
      backdrop-filter: blur(8px);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-subtle);
      font-size: 12px;
      color: var(--primary);
    }
    .feature-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 24px;
    }
    .feature-item {
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }
    .feature-icon-mark {
      width: 20px;
      height: 20px;
      background: rgba(0, 242, 254, 0.15);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      flex-shrink: 0;
      margin-top: 3px;
    }
    /* 4. 行业场景实战 */
    .scenario-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 var(--transition-smooth);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
    }
    .scenario-img-wrap {
      height: 190px;
      overflow: hidden;
      position: relative;
    }
    .scenario-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scenario-body {
      padding: 24px;
    }
    .scenario-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .scenario-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .scenario-tag-row {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .pill-tag {
      font-size: 11px;
      padding: 2px 8px;
      background: rgba(255, 255, 255, 0.05);
      border-radius: var(--radius-full);
      color: var(--text-muted);
    }
    /* 5. 全栈服务矩阵（6核心卡片） */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all 0.3s var(--transition-smooth);
      position: relative;
    }
    .service-card:hover {
      border-color: var(--border-glow);
      background: var(--bg-card-hover);
      transform: translateY(-4px);
    }
    .service-num {
      font-size: 28px;
      font-weight: 800;
      color: rgba(255, 255, 255, 0.1);
      margin-bottom: 12px;
      font-family: monospace;
    }
    .service-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .service-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .service-spec {
      font-size: 12px;
      color: var(--primary);
      border-top: 1px solid var(--border-subtle);
      padding-top: 12px;
    }
    /* 6. 技术结果对比区（蓝图对比选型） */
    .compare-container {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-subtle);
      font-size: 14px;
    }
    .compare-table th {
      background: rgba(255, 255, 255, 0.02);
      color: var(--text-muted);
      font-weight: 600;
    }
    .compare-table th.col-highlight, .compare-table td.col-highlight {
      background: rgba(0, 242, 254, 0.03);
      border-left: 1px solid rgba(0, 242, 254, 0.15);
      border-right: 1px solid rgba(0, 242, 254, 0.15);
      color: var(--text-main);
      font-weight: 600;
    }
    .badge-bad {
      color: var(--signal);
      font-weight: 600;
    }
    .badge-good {
      color: var(--success);
      font-weight: 600;
    }
    /* 7. 资质与技术合规墙 */
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .trust-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }
    .trust-icon {
      font-size: 26px;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .trust-title {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .trust-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    /* 8. 工程交付与协同流程 */
    .process-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-number {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .step-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* 9. 客户成功与落地证据 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-card-img {
      height: 220px;
      overflow: hidden;
    }
    .case-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-card-body {
      padding: 28px;
    }
    .case-card-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .case-card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }
    .case-metric-pills {
      display: flex;
      gap: 16px;
      border-top: 1px solid var(--border-subtle);
      padding-top: 16px;
    }
    .case-pill strong {
      font-size: 16px;
      color: var(--primary);
    }
    .case-pill span {
      display: block;
      font-size: 11px;
      color: var(--text-muted);
    }
    /* 10. 研发里程碑与技术演进 */
    .timeline-wrap {
      position: relative;
      padding-left: 28px;
      border-left: 2px solid var(--border-subtle);
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .timeline-node {
      position: relative;
    }
    .timeline-node::before {
      content: '';
      position: absolute;
      left: -35px;
      top: 6px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--primary);
      border: 3px solid var(--bg-base);
    }
    .timeline-time {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .timeline-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .timeline-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* 11. 技术动态与研发资讯 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.3s ease;
    }
    .news-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      line-height: 1.45;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .news-brief {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .news-link {
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    /* 12. 常见研发问题手风琴 */
    .faq-accordion {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 920px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.25s ease;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: rgba(0, 0, 0, 0.15);
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }
    /* 13. 高转化对接表单 */
    .cta-wrapper {
      max-width: 820px;
      margin: 0 auto;
      background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(20, 25, 34, 0.7) 100%);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 48px;
      position: relative;
      box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
    }
    .cta-wrapper::before {
      content: '';
      position: absolute;
      top: -1px;
      left: 20%;
      right: 20%;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
    }
    .cta-form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }
    .form-full {
      grid-column: span 2;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-ctrl {
      width: 100%;
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 13px 16px;
      font-size: 14px;
      color: var(--text-main);
      transition: all 0.25s ease;
    }
    .form-ctrl:focus {
      border-color: var(--primary);
      box-shadow: 0 0 14px rgba(0, 242, 254, 0.25);
    }
    .form-submit-row {
      margin-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .form-guarantee {
      font-size: 12px;
      color: var(--text-muted);
    }
    /* 页脚设计 */
    .site-footer {
      background: #080a0e;
      border-top: 1px solid var(--border-subtle);
      padding: 60px 0 30px;
      font-size: 13px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand-desc {
      font-size: 13px;
      line-height: 1.7;
      margin: 16px 0 20px;
      color: var(--text-muted);
    }
    .footer-col-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: 0.04em;
    }
    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-list 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;
      font-size: 12px;
      color: #637286;
    }
    .footer-meta-links {
      display: flex;
      gap: 18px;
    }
    .footer-meta-links a:hover {
      color: var(--text-muted);
    }
    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .scenario-grid { grid-template-columns: repeat(2, 1fr); }
      .trust-grid { grid-template-columns: repeat(2, 1fr); }
      .process-steps { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      section { padding: 64px 0; }
      .hero-h1 { font-size: 34px; }
      .engine-grid, .case-grid { grid-template-columns: 1fr; }
      .scenario-grid, .news-grid { grid-template-columns: 1fr; }
      .cta-form-grid { grid-template-columns: 1fr; }
      .form-full { grid-column: span 1; }
      .nav-links { display: none; }
      .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        padding: 24px;
        border-bottom: 1px solid var(--border-subtle);
        gap: 16px;
      }
      .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        padding: 6px;
      }
      .mobile-menu-btn span {
        width: 22px;
        height: 2px;
        background: var(--text-main);
      }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
      .form-submit-row { flex-direction: column; align-items: stretch; text-align: center; }
    }
    @media (min-width: 769px) {
      .mobile-menu-btn { display: none; }
    }