/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-hover: #1444B2;
      --primary-light: #EFF6FF;
      --secondary: #0EA5E9;
      --accent: #10B981;
      --dark-slate: #0F172A;
      --bg-slate: #1E293B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-base: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 12px 28px -4px rgba(26, 86, 219, 0.14);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-full: 9999px;
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-body);
      background-color: var(--bg-light);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      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: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
      min-height: 46px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(26, 86, 219, 0.3);
      transform: translateY(-2px);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      transform: translateY(-2px);
    }
    .btn-white {
      background-color: #fff;
      color: var(--dark-slate);
      font-weight: 700;
    }
    .btn-white:hover {
      background-color: #f1f5f9;
      transform: translateY(-2px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #fff;
    }
    .btn-accent:hover {
      background-color: #059669;
      transform: translateY(-2px);
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      font-size: 0.8rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      background: var(--primary-light);
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .badge-accent {
      background: rgba(16, 185, 129, 0.12);
      color: var(--accent);
    }
    .badge-gold {
      background: rgba(245, 158, 11, 0.15);
      color: #D97706;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 56px;
    }
    .section-header.text-left {
      text-align: left;
      margin-left: 0;
    }
    .section-header h2 {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-top: 12px;
      margin-bottom: 16px;
      line-height: 1.3;
      letter-spacing: -0.5px;
    }
    .section-header p {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .app-section {
      padding: 96px 0;
      position: relative;
    }
    .bg-white-section {
      background-color: var(--bg-white);
    }
    .bg-light-section {
      background-color: var(--bg-light);
    }
    .bg-dark-section {
      background-color: var(--dark-slate);
      color: #F8FAFC;
    }
    .card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-base);
      transition: var(--transition);
      overflow: hidden;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(26, 86, 219, 0.25);
    }

    /* Top Bar */
    .topbar {
      background: var(--dark-slate);
      color: #94A3B8;
      font-size: 0.8rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .topbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
    }
    .topbar-info {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .topbar-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--accent);
    }
    .status-dot {
      width: 7px;
      height: 7px;
      background: var(--accent);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 8px var(--accent);
    }

    /* Main Header */
    .header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
    }
    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .logo-symbol {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      box-shadow: 0 4px 12px rgba(26, 86, 219, 0.25);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-item {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-body);
      position: relative;
      padding: 6px 2px;
    }
    .nav-item:hover, .nav-item.active {
      color: var(--primary);
    }
    .nav-item::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    .nav-item:hover::after, .nav-item.active::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
    }

    /* 1. Hero Carousel Banner */
    .hero-banner {
      position: relative;
      background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
      padding: 100px 0 110px;
      color: #fff;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.75) 60%, rgba(15, 23, 42, 0.6) 100%);
    }
    .hero-container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.22;
      margin: 18px 0 20px;
      letter-spacing: -1px;
    }
    .hero-content h1 span {
      background: linear-gradient(135deg, #60A5FA, #38BDF8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-content p {
      font-size: 1.1rem;
      line-height: 1.75;
      color: #CBD5E1;
      margin-bottom: 32px;
      max-width: 620px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .hero-carousel-wrap {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-md);
      padding: 16px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
      position: relative;
    }
    .carousel-view {
      position: relative;
      border-radius: 12px;
      overflow: hidden;
      aspect-ratio: 16/10;
    }
    .carousel-slide {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .carousel-tag-float {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(15, 23, 42, 0.85);
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 0.8rem;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .carousel-controls {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 14px;
      padding: 0 4px;
    }
    .carousel-nav-btn {
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: #fff;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
    }
    .carousel-nav-btn:hover {
      background: var(--primary);
    }
    .carousel-dots {
      display: flex;
      gap: 8px;
    }
    .dot {
      width: 24px;
      height: 4px;
      background: rgba(255, 255, 255, 0.3);
      border-radius: 2px;
      cursor: pointer;
    }
    .dot.active {
      background: #38BDF8;
      width: 32px;
    }

    /* 2. Product Intro */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1.15fr;
      gap: 56px;
      align-items: center;
    }
    .intro-preview-card {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 20px 35px -10px rgba(15, 23, 42, 0.15);
      border: 1px solid var(--border-color);
    }
    .intro-float-tag {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      padding: 16px 20px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .intro-meta-list {
      margin-top: 24px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .intro-meta-item {
      background: #fff;
      padding: 18px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      border-left: 4px solid var(--primary);
    }
    .intro-meta-item h4 {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 4px;
    }
    .intro-meta-item p {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
    }

    /* 3. Core Features */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      padding: 32px 28px;
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-base);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(26, 86, 219, 0.3);
    }
    .feature-icon-box {
      width: 54px;
      height: 54px;
      border-radius: 14px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      font-weight: 800;
      margin-bottom: 22px;
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 4. Hardware Ecosystem */
    .hardware-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .hardware-card {
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .hardware-thumb {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .hardware-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .hardware-card:hover .hardware-thumb img {
      transform: scale(1.05);
    }
    .hardware-status-badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: rgba(15, 23, 42, 0.85);
      color: var(--accent);
      padding: 4px 10px;
      border-radius: var(--radius-full);
      font-size: 0.75rem;
      font-weight: 600;
    }
    .hardware-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .hardware-body h3 {
      font-size: 1.2rem;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .hardware-spec-list {
      margin: 16px 0;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
      flex: 1;
    }
    .hardware-spec-list li {
      font-size: 0.88rem;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
      margin-bottom: 8px;
    }
    .hardware-spec-list li strong {
      color: var(--text-body);
    }

    /* 5. Deep Dark Philosophy */
    .philosophy-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 56px;
      align-items: center;
    }
    .radar-visual-panel {
      background: var(--bg-slate);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
    }
    .radar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .radar-scale-bar {
      margin-bottom: 18px;
    }
    .radar-scale-label {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      color: #94A3B8;
      margin-bottom: 6px;
    }
    .radar-bar-track {
      height: 8px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 4px;
      overflow: hidden;
    }
    .radar-bar-fill {
      height: 100%;
      border-radius: 4px;
      background: linear-gradient(90deg, #0EA5E9, #10B981);
    }

    /* 6. Training Scenarios */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
    }
    .scenario-card h3 {
      font-size: 1.15rem;
      margin: 14px 0 8px;
      color: var(--text-main);
    }
    .scenario-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }
    .scenario-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      background: var(--primary-light);
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-block;
      align-self: flex-start;
    }

    /* 7. Algorithm Workflow */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step-card {
      background: #fff;
      padding: 30px 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: #E2E8F0;
      line-height: 1;
      margin-bottom: 12px;
    }
    .flow-step-card h3 {
      font-size: 1.1rem;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .flow-step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 8. User Stories */
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .story-card {
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1.1fr 1fr;
    }
    .story-image-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-content {
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-metric-box {
      background: var(--bg-light);
      border-radius: 8px;
      padding: 12px 16px;
      margin: 16px 0;
      display: flex;
      justify-content: space-between;
    }

    /* 9. Metrics Bar */
    .metrics-bar {
      background: linear-gradient(135deg, #1A56DB 0%, #0F172A 100%);
      color: #fff;
      padding: 64px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item .number {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.1;
      margin-bottom: 6px;
      letter-spacing: -1px;
    }
    .metric-item .label {
      font-size: 0.95rem;
      color: #CBD5E1;
    }

    /* 10. Testimonials */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
    }
    .testi-stars {
      color: #F59E0B;
      font-size: 1.1rem;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .testi-card p {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
      flex: 1;
    }
    .testi-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.05rem;
    }
    .user-meta h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 11. News & Insights */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-card .thumb {
      height: 180px;
      overflow: hidden;
    }
    .news-card .thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .news-card:hover .thumb img {
      transform: scale(1.05);
    }
    .news-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .news-content h3 {
      font-size: 1.15rem;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      flex: 1;
    }

    /* 12. FAQ Accordion */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item details {
      width: 100%;
    }
    .faq-item summary {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary);
      font-weight: 400;
      transition: var(--transition);
    }
    .faq-item details[open] summary::after {
      content: '−';
    }
    .faq-item .faq-answer {
      padding: 0 24px 22px;
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 13. Trust & Security */
    .trust-bar {
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      background: #fff;
      padding: 42px 0;
    }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .trust-box {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .trust-icon {
      width: 42px;
      height: 42px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
    }
    .trust-text h4 {
      font-size: 0.95rem;
      color: var(--text-main);
      margin-bottom: 2px;
    }
    .trust-text p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 14. Global CTA */
    .cta-card {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      border-radius: var(--radius-md);
      padding: 64px 48px;
      color: #fff;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow: 0 20px 40px rgba(15, 23, 42, 0.2);
    }
    .cta-download-box {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .qr-placeholder {
      width: 100px;
      height: 100px;
      background: #fff;
      border-radius: 8px;
      padding: 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--text-main);
      font-size: 0.72rem;
      text-align: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .qr-matrix {
      width: 100%;
      height: 70px;
      background: repeating-linear-gradient(45deg, #000, #000 4px, #fff 4px, #fff 8px);
      margin-bottom: 4px;
      border-radius: 4px;
    }

    /* Footer */
    .footer {
      background: #0B1120;
      color: #94A3B8;
      padding-top: 72px;
      padding-bottom: 36px;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-col h4 {
      font-size: 1rem;
      color: #F8FAFC;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a:hover {
      color: #38BDF8;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-container, .intro-grid, .philosophy-grid, .cta-card {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .features-grid, .hardware-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid, .flow-steps, .trust-grid, .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px;
      }
    }
    @media (max-width: 768px) {
      .app-section {
        padding: 56px 0;
      }
      .features-grid, .hardware-grid, .testimonials-grid, .news-grid, .stories-grid, .scenario-grid, .flow-steps, .metrics-grid, .trust-grid {
        grid-template-columns: 1fr;
      }
      .story-card {
        grid-template-columns: 1fr;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
      }
      .nav-menu.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .hero-content h1 {
        font-size: 2.1rem;
      }
      .cta-card {
        padding: 32px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }