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

      :root {
        --primary: #2563eb;
        --primary-dark: #1e40af;
        --secondary: #10b981;
        --text: #1f2937;
        --text-light: #6b7280;
        --bg: #ffffff;
        --bg-light: #f9fafb;
        --border: #e5e7eb;
        --success: #059669;
        --warning: #f59e0b;
        --learning-com: #00a651;
        --vh: 1vh;
      }

      html {
        height: -webkit-fill-available;
        scroll-behavior: smooth;
        scroll-padding-top: 80px;
      }

      body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          Oxygen, Ubuntu, sans-serif;
        line-height: 1.6;
        color: var(--text);
        background: var(--bg);
        min-height: 100vh;
        min-height: -webkit-fill-available;
      }

      /* Header */
      header {
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        position: sticky;
        top: 0;
        z-index: 1000;
        backdrop-filter: blur(10px);
        background: rgba(255, 255, 255, 0.95);
      }

      nav {
        max-width: 1200px;
        margin: 0 auto;
        padding: 1rem 2rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
      }

      .logo {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--primary);
        text-decoration: none;
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .integration-badge {
        background: var(--learning-com);
        color: white;
        padding: 0.25rem 0.75rem;
        border-radius: 2rem;
        font-size: 0.75rem;
        font-weight: 600;
      }

      .nav-links {
        display: flex;
        gap: 2rem;
        list-style: none;
      }

      .nav-links a {
        color: var(--text);
        text-decoration: none;
        font-weight: 500;
        transition: color 0.3s;
      }

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

      /* Hero Section */
      .hero {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        padding: 4rem 2rem;
        text-align: center;
        min-height: calc(var(--vh, 1vh) * 50);
        display: flex;
        align-items: center;
      }

      .hero .container {
        width: 100%;
      }

      .hero h1 {
        font-size: 3rem;
        margin-bottom: 1rem;
        font-weight: 800;
      }

      .hero .subtitle {
        font-size: 1.25rem;
        opacity: 0.95;
        max-width: 700px;
        margin: 0 auto 2rem;
      }

      .hero-buttons {
        display: flex;
        gap: 1rem;
        justify-content: center;
        flex-wrap: wrap;
      }

      .btn {
        padding: 0.75rem 2rem;
        border-radius: 0.5rem;
        text-decoration: none;
        font-weight: 600;
        transition: all 0.3s;
        display: inline-block;
        cursor: pointer;
        border: none;
        font-size: 1rem;
        will-change: transform;
      }

      .btn-primary {
        background: white;
        color: var(--primary);
      }

      @media (hover: hover) {
        .btn-primary:hover {
          transform: translateY(-2px);
          box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
      }

      .btn-primary:active {
        transform: scale(0.98);
      }

      .btn-secondary {
        background: transparent;
        color: white;
        border: 2px solid white;
      }

      @media (hover: hover) {
        .btn-secondary:hover {
          background: white;
          color: var(--primary);
        }
      }

      .btn-secondary:active {
        transform: scale(0.98);
      }

      .btn-learning {
        background: var(--learning-com);
        color: white;
      }

      /* Main Content */
      .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 2rem;
        width: 100%;
        box-sizing: border-box;
      }

      .section {
        margin-bottom: 4rem;
      }

      .section-header {
        text-align: center;
        margin-bottom: 3rem;
      }

      .section-header h2 {
        font-size: 2.5rem;
        margin-bottom: 1rem;
        color: var(--text);
      }

      .section-header p {
        font-size: 1.125rem;
        color: var(--text-light);
        max-width: 700px;
        margin: 0 auto;
      }

      /* Grid Layouts */
      .grid {
        display: grid;
        gap: 2rem;
      }

      .grid-3 {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      }

      .grid-2 {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
      }

      /* Cards */
      .card {
        background: var(--bg);
        border: 1px solid var(--border);
        border-radius: 0.75rem;
        padding: 1.5rem;
        transition: all 0.3s;
        cursor: pointer;
      }

      @media (hover: hover) {
        .card:hover {
          transform: translateY(-4px);
          box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }
      }

      .card:active {
        transform: scale(0.98);
      }

      .card-icon {
        width: 48px;
        height: 48px;
        background: var(--primary);
        border-radius: 0.5rem;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1rem;
        font-size: 1.5rem;
      }

      .card h3 {
        font-size: 1.25rem;
        margin-bottom: 0.5rem;
        color: var(--text);
      }

      .card p {
        color: var(--text-light);
        margin-bottom: 1rem;
      }

      /* Integration Section */
      .integration-section {
        background: linear-gradient(to bottom, var(--bg-light), white);
        padding: 4rem 0;
        margin: 0;
      }

      .integration-flow {
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        gap: 2rem;
        align-items: center;
        max-width: 900px;
        margin: 3rem auto;
      }

      .integration-box {
        background: white;
        border: 2px solid var(--border);
        border-radius: 1rem;
        padding: 2rem;
        text-align: center;
      }

      .integration-box.learning {
        border-color: var(--learning-com);
      }

      .integration-box.policy {
        border-color: var(--primary);
      }

      .integration-arrow {
        font-size: 2rem;
        color: var(--text-light);
      }

      .integration-box h3 {
        color: var(--text);
        margin-bottom: 1rem;
      }

      .integration-box ul {
        list-style: none;
        padding: 0;
      }

      .integration-box li {
        padding: 0.5rem 0;
        color: var(--text-light);
      }

      /* Prompt Categories */
      .prompt-categories {
        display: flex;
        gap: 1rem;
        margin-bottom: 2rem;
        flex-wrap: wrap;
        justify-content: center;
      }

      .category-btn {
        padding: 0.5rem 1.5rem;
        background: var(--bg-light);
        border: 2px solid var(--border);
        border-radius: 2rem;
        cursor: pointer;
        transition: all 0.3s;
        font-weight: 500;
      }

      .category-btn:hover,
      .category-btn.active {
        background: var(--primary);
        color: white;
        border-color: var(--primary);
      }

      .category-btn.learning-com {
        border-color: var(--learning-com);
      }

      .category-btn.learning-com.active {
        background: var(--learning-com);
        border-color: var(--learning-com);
      }

      /* Prompt Cards */
      .prompt-card {
        background: var(--bg-light);
        border-radius: 0.75rem;
        padding: 1.5rem;
        margin-bottom: 1.5rem;
      }

      .prompt-card.featured {
        border: 2px solid var(--learning-com);
        background: linear-gradient(
          to right,
          rgba(0, 166, 81, 0.05),
          transparent
        );
      }

      .prompt-header {
        display: flex;
        justify-content: space-between;
        align-items: start;
        margin-bottom: 1rem;
      }

      .prompt-title {
        font-size: 1.125rem;
        font-weight: 600;
        color: var(--text);
      }

      .prompt-badge {
        background: var(--primary);
        color: white;
        padding: 0.25rem 0.75rem;
        border-radius: 1rem;
        font-size: 0.875rem;
        font-weight: 500;
      }

      .prompt-badge.learning {
        background: var(--learning-com);
      }

      .prompt-content {
        background: white;
        border: 1px solid var(--border);
        border-radius: 0.5rem;
        padding: 1rem;
        padding-top: 3rem;
        margin: 1rem 0;
        font-family: "Courier New", monospace;
        font-size: 0.9rem;
        line-height: 1.5;
        position: relative;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
      }

      .prompt-content pre {
        margin: 0;
        white-space: pre-wrap;
        word-wrap: break-word;
      }

      .copy-btn {
        position: absolute;
        top: 0.5rem;
        right: 0.5rem;
        padding: 0.5rem 1rem;
        background: var(--primary);
        color: white;
        border: none;
        border-radius: 0.25rem;
        cursor: pointer;
        font-size: 0.875rem;
        font-weight: 500;
        transition: background 0.3s;
      }

      .copy-btn:hover {
        background: var(--primary-dark);
      }

      .copy-btn.copied {
        background: var(--success);
      }

      /* Checklist */
      .checklist {
        background: var(--bg-light);
        border-radius: 0.75rem;
        padding: 2rem;
      }

      .checklist-section {
        margin-bottom: 2rem;
      }

      .checklist-section h3 {
        color: var(--primary);
        margin-bottom: 1rem;
        font-size: 1.25rem;
      }

      .checklist-item {
        display: flex;
        align-items: start;
        margin-bottom: 0.75rem;
        padding-left: 1.5rem;
        position: relative;
      }

      .checklist-item input[type="checkbox"] {
        position: absolute;
        left: 0;
        top: 0.25rem;
        width: 18px;
        height: 18px;
        cursor: pointer;
      }

      .checklist-item label {
        cursor: pointer;
        user-select: none;
      }

      /* Statistics */
      .stats {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 2rem;
        margin: 3rem 0;
        padding: 2rem;
        background: var(--bg-light);
        border-radius: 1rem;
      }

      .stat {
        text-align: center;
      }

      .stat-value {
        font-size: 2.5rem;
        font-weight: 700;
        color: var(--primary);
      }

      .stat-label {
        color: var(--text-light);
        font-size: 0.875rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
      }

      /* Footer */
      footer {
        background: var(--text);
        color: white;
        padding: 3rem 2rem 2rem;
        margin-top: 4rem;
      }

      .footer-content {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 2rem;
        margin-bottom: 2rem;
      }

      .footer-section h4 {
        margin-bottom: 1rem;
        color: white;
      }

      .footer-section a {
        color: rgba(255, 255, 255, 0.8);
        text-decoration: none;
        display: block;
        margin-bottom: 0.5rem;
        transition: color 0.3s;
      }

      .footer-section a:hover {
        color: white;
      }

      .footer-bottom {
        text-align: center;
        padding-top: 2rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        color: rgba(255, 255, 255, 0.6);
      }

      /* Mobile Responsive */
      .mobile-menu {
        display: none;
        background: none;
        border: none;
        cursor: pointer;
        padding: 0.5rem;
        z-index: 1001;
      }

      .mobile-menu span {
        display: block;
        width: 25px;
        height: 3px;
        background: var(--text);
        margin: 5px 0;
        transition: 0.3s;
      }

      .mobile-menu.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
      }

      .mobile-menu.active span:nth-child(2) {
        opacity: 0;
      }

      .mobile-menu.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
      }

      /* Tab System */
      .tabs {
        border-bottom: 2px solid var(--border);
        margin-bottom: 2rem;
      }

      .tab-list {
        display: flex;
        gap: 2rem;
        overflow-x: auto;
      }

      .tab-button {
        padding: 1rem 0;
        background: none;
        border: none;
        border-bottom: 3px solid transparent;
        cursor: pointer;
        font-weight: 500;
        color: var(--text-light);
        transition: all 0.3s;
        white-space: nowrap;
      }

      .tab-button:hover {
        color: var(--text);
      }

      .tab-button.active {
        color: var(--primary);
        border-bottom-color: var(--primary);
      }

      .tab-content {
        display: none;
      }

      .tab-content.active {
        display: block;
      }

      /* CTA Section */
      .cta {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        padding: 4rem 2rem;
        border-radius: 1rem;
        text-align: center;
        margin: 4rem 0;
      }

      .cta h2 {
        font-size: 2rem;
        margin-bottom: 1rem;
      }

      .cta p {
        font-size: 1.125rem;
        margin-bottom: 2rem;
        opacity: 0.95;
      }

      /* Alert Box */
      .alert {
        background: linear-gradient(
          to right,
          rgba(0, 166, 81, 0.1),
          rgba(0, 166, 81, 0.05)
        );
        border-left: 4px solid var(--learning-com);
        padding: 1rem 1.5rem;
        margin: 2rem 0;
        border-radius: 0.5rem;
      }

      .alert-title {
        font-weight: 600;
        color: var(--text);
        margin-bottom: 0.5rem;
      }

      .alert-content {
        color: var(--text-light);
      }

      /* Back to Home Navigation */
      .back-to-home {
        margin-bottom: 2rem;
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--border);
      }

      .back-link {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--primary);
        text-decoration: none;
        font-weight: 500;
        padding: 0.5rem 1rem;
        border-radius: 0.5rem;
        transition: all 0.3s ease;
        background: var(--bg-light);
      }

      .back-link:hover {
        background: var(--primary);
        color: white;
        transform: translateX(-5px);
      }

      .back-link:focus {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
      }

      /* Non-functional placeholder links */
      .placeholder-link {
        color: #f59e0b !important;
        cursor: not-allowed;
        opacity: 0.8;
        position: relative;
      }

      .placeholder-link:hover {
        color: #d97706 !important;
        text-decoration: none;
      }

      .placeholder-link::after {
        content: " (Coming Soon)";
        font-size: 0.75em;
        opacity: 0.7;
      }

      /* Mobile Styles */
      @media (max-width: 768px) {
        nav {
          padding: 1rem;
        }

        .logo {
          font-size: 1.25rem;
        }

        .integration-badge {
          display: none;
        }

        .nav-links {
          display: none;
          position: absolute;
          top: 100%;
          left: 0;
          right: 0;
          background: white;
          flex-direction: column;
          padding: 1rem;
          box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
          gap: 0.5rem;
        }

        .nav-links.active {
          display: flex;
        }

        .nav-links a {
          padding: 0.75rem 1rem;
          border-radius: 0.5rem;
          transition: background 0.3s;
          display: block;
          min-height: 44px;
          display: flex;
          align-items: center;
        }

        .nav-links a:hover {
          background: var(--bg-light);
        }

        .mobile-menu {
          display: block;
        }

        .hero {
          padding: 3rem 1rem;
          min-height: calc(var(--vh, 1vh) * 60);
        }

        .hero h1 {
          font-size: 2rem;
          line-height: 1.2;
        }

        .hero .subtitle {
          font-size: 1rem;
          margin-bottom: 1.5rem;
        }

        .hero-buttons {
          flex-direction: column;
          width: 100%;
          max-width: 300px;
          margin: 0 auto;
        }

        .hero-buttons .btn {
          width: 100%;
          text-align: center;
        }

        .integration-flow {
          grid-template-columns: 1fr;
          gap: 1rem;
        }

        .integration-arrow {
          transform: rotate(90deg);
          margin: 1rem 0;
        }

        .stats {
          grid-template-columns: repeat(2, 1fr);
          gap: 1rem;
          padding: 1.5rem;
        }

        .stat-value {
          font-size: 2rem;
        }

        .stat-label {
          font-size: 0.75rem;
        }

        .section {
          margin-bottom: 3rem;
        }

        .back-to-home {
          margin-bottom: 1.5rem;
          padding-bottom: 0.75rem;
        }

        .back-link {
          padding: 0.5rem 0.75rem;
          font-size: 0.875rem;
        }

        .section-header {
          margin-bottom: 2rem;
        }

        .section-header h2 {
          font-size: 1.75rem;
        }

        .section-header p {
          font-size: 1rem;
        }

        .grid-3,
        .grid-2 {
          grid-template-columns: 1fr;
          gap: 1.5rem;
        }

        .card {
          padding: 1.25rem;
        }

        .card h3 {
          font-size: 1.125rem;
        }

        .prompt-categories {
          overflow-x: auto;
          display: flex;
          gap: 0.5rem;
          padding-bottom: 0.5rem;
          margin-bottom: 1.5rem;
          -webkit-overflow-scrolling: touch;
        }

        .category-btn {
          padding: 0.5rem 1rem;
          white-space: nowrap;
          font-size: 0.875rem;
        }

        .prompt-card {
          padding: 1.25rem;
          margin-bottom: 1rem;
        }

        .prompt-header {
          flex-direction: column;
          gap: 0.5rem;
          align-items: flex-start;
        }

        .prompt-title {
          font-size: 1rem;
        }

        .prompt-content {
          padding: 3.5rem 0.75rem 0.75rem;
          margin: 0.75rem 0;
          font-size: 0.8rem;
        }

        .prompt-content pre {
          white-space: pre-wrap;
          word-wrap: break-word;
        }

        .copy-btn {
          position: absolute;
          top: 0.5rem;
          right: 0.5rem;
          left: 0.5rem;
          width: calc(100% - 1rem);
          margin-bottom: 0;
          padding: 0.5rem;
        }

        .checklist {
          padding: 1.5rem;
        }

        .checklist-section h3 {
          font-size: 1.125rem;
        }

        .checklist-item {
          padding-left: 1.75rem;
          margin-bottom: 1rem;
        }

        .checklist-item label {
          font-size: 0.9rem;
          line-height: 1.4;
        }

        .checklist-item input[type="checkbox"] {
          width: 20px;
          height: 20px;
          top: 0;
        }

        .tab-list {
          gap: 1rem;
          padding-bottom: 0.5rem;
        }

        .tab-button {
          font-size: 0.875rem;
          padding: 0.75rem 0;
        }

        .btn {
          padding: 0.875rem 1.5rem;
          font-size: 0.9rem;
          width: 100%;
          max-width: 300px;
        }

        .cta {
          padding: 3rem 1.5rem;
          margin: 2rem 0;
        }

        .cta h2 {
          font-size: 1.5rem;
        }

        .cta p {
          font-size: 1rem;
        }

        .cta input[type="email"] {
          font-size: 16px;
        }

        footer {
          padding: 2rem 1rem 1.5rem;
        }

        .footer-content {
          grid-template-columns: 1fr;
          gap: 1.5rem;
        }

        .footer-section h4 {
          font-size: 1.125rem;
          margin-bottom: 0.75rem;
        }
      }

      @media (max-width: 480px) {
        .container {
          padding: 1rem;
        }

        .hero {
          padding: 3rem 1rem;
          min-height: calc(var(--vh, 1vh) * 60);
        }

        .hero h1 {
          font-size: 1.75rem;
        }

        .hero .subtitle {
          font-size: 0.9rem;
        }

        .stats {
          grid-template-columns: 1fr;
          gap: 1rem;
        }

        .section-header h2 {
          font-size: 1.5rem;
        }

        .section-header p {
          font-size: 0.9rem;
        }

        .card {
          padding: 1rem;
        }

        .card-icon {
          width: 40px;
          height: 40px;
          font-size: 1.25rem;
        }

        .prompt-categories {
          margin: 0 -1rem;
          padding: 0 1rem 0.5rem;
        }

        .cta {
          border-radius: 0;
          margin: 2rem -1rem;
          padding: 2.5rem 1rem;
        }

        .cta h2 {
          font-size: 1.25rem;
        }

        .footer-bottom {
          font-size: 0.875rem;
          padding: 1rem;
        }
      }

      /* Touch-friendly adjustments */
      @media (hover: none) and (pointer: coarse) {
        button,
        .btn,
        .category-btn,
        .tab-button {
          min-height: 44px;
          min-width: 44px;
        }

        .checklist-item input[type="checkbox"] {
          width: 24px;
          height: 24px;
        }
      }

      /* Landscape mobile */
      @media (max-width: 812px) and (orientation: landscape) {
        .hero {
          padding: 2rem 1rem;
        }

        .hero h1 {
          font-size: 1.75rem;
        }

        .stats {
          grid-template-columns: repeat(4, 1fr);
        }
      }

      /* Images - responsive and lazy loading ready */
      img {
        max-width: 100%;
        height: auto;
        display: block;
      }

      /* Smooth transitions */
      * {
        -webkit-tap-highlight-color: transparent;
      }

      /* Better focus styles for accessibility */
      *:focus {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
      }

      button:focus,
      .btn:focus {
        outline-offset: 4px;
      }

      /* Print styles */
      @media print {
        .mobile-menu,
        .nav-links,
        .hero-buttons,
        .copy-btn,
        .btn,
        footer {
          display: none !important;
        }

        .prompt-content {
          page-break-inside: avoid;
        }

        .checklist-item {
          page-break-inside: avoid;
        }
      }