:root {
    --primary-600: #7c3aed;
    --primary-700: #6d28d9;
    --primary-50: rgba(124, 58, 237, 0.05);
    --primary-100: rgba(124, 58, 237, 0.1);
    --primary-200: rgba(124, 58, 237, 0.2);
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --success-500: #059669;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  }

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

  html {
    scroll-behavior: smooth;
  }

  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
    }
  }

  body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--primary-100) 1px, transparent 1px);
    background-size: 32px 32px;
    background-repeat: repeat;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
  }

  /* Header */
  .site-header {
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-shrink: 0;
  }

  .site-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    position: relative;
  }

  .logo-img {
    height: 56px;
    width: auto;
    max-width: 180px;
    object-fit: contain;
    transition: opacity 0.3s ease;
  }

  .logo-img:not([src]),
  .logo-img[src=""] {
    display: none;
  }

  .logo-fallback {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.025em;
  }

  .logo-skeleton {
    height: 32px;
    width: 120px;
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: 4px;
  }

  @keyframes loading {
    0% {
      background-position: 200% 0;
    }

    100% {
      background-position: -200% 0;
    }
  }

  .social-links {
    display: flex;
    gap: 1rem;
    align-items: center;
  }

  .social-links a {
    color: var(--gray-500);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: transparent;
  }

  .social-links a:hover {
    color: var(--primary-600);
    background: var(--primary-50);
    transform: translateY(-2px);
  }

  .social-links a:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  /* Main container */
  .landing-container {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
    position: relative;
    z-index: 1;
  }

  /* Hero section - responsive grid */
  .hero-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: start;
    margin-bottom: 4rem;
  }

  @media (min-width: 1024px) {
    .hero-section {
      grid-template-columns: 1fr 480px;
      gap: 4rem;
    }
  }

  .hero-content {
    display: flex;
    flex-direction: column;
  }

  .hero-title {
    font-weight: 800;
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.05;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
    letter-spacing: -0.025em;
  }

  .hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    color: var(--gray-600);
    margin-bottom: 2rem;
    line-height: 1.6;
    max-width: 32rem;
  }

  .hero-ctas {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .hero-tagline {
    font-size: 0.875rem;
    color: var(--gray-400);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .hero-tagline::before {
    content: "•";
    color: var(--primary-600);
    font-weight: 700;
  }

  .hero-tagline::after {
    content: "•";
    color: var(--primary-600);
    font-weight: 700;
  }

  .btn {
    padding: 0.875rem 1.75rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
  }

  .btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
  }

  .btn:hover::before {
    left: 100%;
  }

  .btn-primary {
    background: var(--primary-600);
    color: white;
    box-shadow: var(--shadow-lg);
  }

  .btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-xl);
  }

  .btn-primary:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  .btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 1.5px solid var(--gray-300);
    box-shadow: var(--shadow-sm);
  }

  .btn-secondary:hover {
    border-color: var(--gray-400);
    background: var(--gray-50);
    transform: translateY(-1px) scale(1.02);
    box-shadow: var(--shadow-md);
  }

  .btn-secondary:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  /* Demo card - improved design */
  .demo-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--gray-200);
    backdrop-filter: blur(16px);
    width: 100%;
    max-width: 480px;
    justify-self: center;
  }

  @media (min-width: 1024px) {
    .demo-card {
      justify-self: start;
    }
  }

  /* Improved tabs */
  .demo-tabs {
    display: flex;
    background: var(--gray-100);
    border-radius: 10px;
    padding: 4px;
    margin-bottom: 1.5rem;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .demo-tabs::-webkit-scrollbar {
    display: none;
  }

  .demo-tab {
    padding: 0.625rem 1rem;
    border-radius: 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-600);
    transition: all 0.2s ease;
    white-space: nowrap;
    font-family: inherit;
    font-size: 0.875rem;
    flex: 1;
    min-width: fit-content;
    position: relative;
  }

  .demo-tab:hover {
    color: var(--gray-700);
  }

  .demo-tab:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  .demo-tab.active {
    background: white;
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
  }

  /* Demo content with improved spacing */
  .demo-content {
    display: none;
  }

  .demo-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
  }

  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(8px);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .demo-content.active {
      animation: none;
    }
  }

  .demo-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.75rem;
    font-weight: 600;
  }

  .demo-question {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    padding: 1rem;
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: 1.5rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    line-height: 1.5;
    min-height: auto;
    transition: all 0.3s ease;
  }

  .demo-question.updated {
    border-color: var(--primary-200);
    background: var(--primary-50);
  }

  .demo-question[aria-live] {
    outline: none;
  }

  .demo-question[aria-live]:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  .demo-sql-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
  }

  .demo-success {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success-500);
    font-size: 0.875rem;
    font-weight: 600;
    opacity: 0;
    transition: all 0.3s ease;
    transform: translateX(8px);
  }

  .demo-success.show {
    opacity: 1;
    transform: translateX(0);
  }

  .demo-sql {
    background: var(--gray-900);
    border: 1px solid var(--gray-700);
    border-radius: 10px;
    padding: 1.25rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.8125rem;
    color: #e5e7eb;
    overflow-x: auto;
    overflow-y: auto;
    white-space: pre-wrap;
    line-height: 1.4;
    margin-bottom: 1.5rem;
    height: 180px;
    max-height: 180px;
    position: relative;
  }

  /* Enhanced SQL syntax highlighting */
  .demo-sql .sql-keyword {
    color: #818cf8;
    font-weight: 600;
  }

  .demo-sql .sql-string {
    color: #34d399;
  }

  .demo-sql .sql-func {
    color: #60a5fa;
    font-weight: 500;
  }

  .demo-sql .sql-number {
    color: #fbbf24;
  }

  .demo-sql .sql-comment {
    color: #9ca3af;
    font-style: italic;
  }

  .demo-sql.typing::after {
    content: '';
    display: inline-block;
    width: 2px;
    height: 1em;
    background: #818cf8;
    margin-left: 4px;
    vertical-align: baseline;
    animation: blink-caret 1s steps(1) infinite;
  }

  @keyframes blink-caret {

    0%,
    50% {
      opacity: 1;
    }

    51%,
    100% {
      opacity: 0;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .demo-sql.typing::after {
      animation: none;
      opacity: 1;
    }
  }

  .demo-cta {
    display: flex;
    gap: 0.75rem;
  }

  .demo-complexity {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
  }

  .complexity-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gray-300);
  }

  .complexity-dot.filled {
    background: var(--primary-600);
  }

  .btn-light {
    flex: 1;
    background: var(--primary-100);
    color: var(--primary-600);
    border: 1px solid var(--primary-200);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    text-align: center;
  }

  .btn-light:hover {
    background: var(--primary-200);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
  }

  .btn-light:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  /* Enhanced video container */
  .video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--gray-900);
    border: 1px solid var(--gray-700);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-md);
  }

  .video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: var(--gray-300);
    text-align: center;
    padding: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
  }

  .video-placeholder:hover {
    background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-800) 100%);
  }

  .video-placeholder svg {
    margin-bottom: 1rem;
    opacity: 0.8;
    width: 48px;
    height: 48px;
    transition: transform 0.3s ease;
  }

  .video-placeholder:hover svg {
    transform: scale(1.1);
  }

  .video-placeholder h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: white;
    font-weight: 600;
  }

  .video-placeholder p {
    font-size: 0.875rem;
    max-width: 200px;
    line-height: 1.4;
    opacity: 0.8;
  }

  .demo-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .video-description {
    color: var(--gray-500);
    font-size: 0.875rem;
    line-height: 1.5;
    margin-top: 0.75rem;
  }

  .video-fallback {
    display: none;
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    margin-bottom: 1rem;
  }

  .video-fallback.show {
    display: block;
  }

  .video-fallback a {
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 600;
  }

  .video-fallback a:hover {
    text-decoration: underline;
  }

  /* Enhanced features section */
  .features-section {
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 1px solid var(--gray-200);
  }

  .features-intro {
    text-align: center;
    margin-bottom: 3rem;
  }

  .features-intro h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
  }

  .features-intro p {
    color: var(--gray-600);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
  }

  .features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
  }

  .feature-card {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(8px);
    opacity: 0;
    transform: translateY(20px);
  }

  .feature-card.animate {
    opacity: 1;
    transform: translateY(0);
  }

  .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
  }

  .feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary-100);
    color: var(--primary-600);
  }

  .feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
  }

  .feature-desc {
    color: var(--gray-600);
    line-height: 1.6;
    font-size: 0.9375rem;
  }

  /* Enhanced footer */
  .footer {
    background: var(--gray-900);
    color: var(--gray-300);
    text-align: center;
    padding: 2rem 1.5rem;
    margin-top: auto;
    flex-shrink: 0;
    z-index: 2;
  }

  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
    font-size: 0.875rem;
  }

  .footer-content a {
    color: var(--gray-300);
    text-decoration: none;
    transition: color 0.2s ease;
  }

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

  .footer-content a:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
  }

  /* Error boundary */
  .error-fallback {
    background: #fee;
    border: 1px solid #fcc;
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    text-align: center;
  }

  /* Mobile optimizations */
  @media (max-width: 768px) {
    .landing-container {
      padding: 2rem 1.25rem;
    }

    .hero-section {
      gap: 2.5rem;
      margin-bottom: 3rem;
    }

    .hero-content {
      text-align: center;
    }

    .hero-ctas {
      flex-direction: column;
      width: 100%;
      max-width: 400px;
      margin: 0 auto 2rem;
      gap: 0.875rem;
    }

    .btn {
      width: 100%;
      justify-content: center;
      padding: 1rem 2rem;
      font-size: 1rem;
    }

    .demo-card {
      padding: 1.75rem 1.5rem;
      max-width: none;
      margin: 0;
    }

    .demo-sql {
      min-height: 160px;
      font-size: 0.75rem;
      padding: 1.125rem;
    }

    .features-section {
      margin-top: 3rem;
    }

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

    .feature-card {
      padding: 1.75rem;
    }
  }

  @media (max-width: 480px) {
    .site-header-inner {
      padding: 1rem 1.25rem;
    }

    .landing-container {
      padding: 1.5rem 1rem;
    }

    .social-links {
      gap: 0.75rem;
    }

    .social-links a {
      width: 36px;
      height: 36px;
    }

    .hero-ctas {
      max-width: 320px;
      gap: 0.75rem;
    }

    .btn {
      padding: 0.875rem 1.75rem;
      font-size: 0.9375rem;
    }

    .demo-card {
      padding: 1.5rem 1.25rem;
      border-radius: 12px;
    }

    .demo-sql {
      padding: 1rem;
      min-height: 140px;
      font-size: 0.8125rem;
    }

    .demo-tabs {
      margin-bottom: 1.25rem;
      padding: 3px;
    }

    .demo-tab {
      padding: 0.5625rem 0.875rem;
      font-size: 0.8125rem;
    }

    .features-intro h2 {
      font-size: 1.75rem;
    }

    .feature-card {
      padding: 1.5rem;
    }

    .feature-icon {
      width: 40px;
      height: 40px;
    }
  }

  /* Icon styles */
  .icon {
    width: 24px;
    height: 24px;
    fill: currentColor;
  }