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

      .fade-in {
         opacity: 0;
         transform: translateY(20px);
         animation: fadeUp 0.8s ease-out forwards;
         }

         .how-card:hover {
         border-color: hsl(185, 85%, 55%, 0.5);
         box-shadow: 0 0 40px hsl(185 85% 55% / 0.3);
         }

         @keyframes fadeUp {
         from {
            opacity: 0;
            transform: translateY(20px);
         }
         to {
            opacity: 1;
            transform: translateY(0);
         }
      }  


      :root {
        --background: hsl(220, 25%, 8%);
        --foreground: hsl(180, 5%, 95%);
        --card: hsl(220, 20%, 12%);
        --card-foreground: hsl(180, 5%, 95%);
        --primary: hsl(185, 85%, 55%);
        --primary-foreground: hsl(220, 25%, 8%);
        --primary-glow: hsl(185, 95%, 70%);
        --secondary: hsl(220, 18%, 16%);
        --muted-foreground: hsl(180, 5%, 65%);
        --border: hsl(220, 15%, 18%);
      }

      body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        background: linear-gradient(180deg, var(--background), hsl(220, 30%, 6%));
        color: var(--foreground);
        line-height: 1.6;
        min-height: 100vh;
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1.5rem;
      }

      /* Hero Section */
      .hero {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
        overflow: hidden;
        padding-top: 6rem;
      }

      .hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(circle at 50% 0%, hsl(185 85% 55% / 0.15), transparent 70%);
        opacity: 0.5;
      }

      .hero-bg-1 {
        position: absolute;
        top: 25%;
        left: 25%;
        width: 24rem;
        height: 24rem;
        background: hsl(185 85% 55% / 0.1);
        border-radius: 50%;
        filter: blur(80px);
        animation: pulse 3s ease-in-out infinite;
      }

      .hero-bg-2 {
        position: absolute;
        bottom: 25%;
        right: 25%;
        width: 24rem;
        height: 24rem;
        background: hsl(185 80% 45% / 0.1);
        border-radius: 50%;
        filter: blur(80px);
        animation: pulse 3s ease-in-out infinite 1s;
      }

      .hero-content {
        position: relative;
        z-index: 10;
        text-align: center;
        animation: fadeIn 1s ease-out;
      }

      .hero h1 {
        font-size: clamp(3rem, 8vw, 5rem);
        font-weight: bold;
        background: linear-gradient(135deg, hsl(185, 85%, 55%), hsl(200, 80%, 45%));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        margin-bottom: 1rem;
      }

      .hero-subtitle {
        font-size: clamp(1.5rem, 4vw, 2rem);
        color: hsl(180, 5%, 90%);
        font-weight: 300;
        margin-bottom: 2rem;
      }

      .hero-description {
        font-size: 1.25rem;
        color: var(--muted-foreground);
        max-width: 42rem;
        margin: 0 auto 2rem;
      }

      .btn {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 1.25rem 2rem;
        font-size: 1.125rem;
        font-weight: 600;
        color: var(--primary-foreground);
        background: linear-gradient(135deg, hsl(185, 85%, 55%), hsl(200, 80%, 45%));
        border: none;
        border-radius: 0.75rem;
        cursor: pointer;
        transition: opacity 0.3s, transform 0.2s;
        box-shadow: 0 0 40px hsl(185 85% 55% / 0.3);
        animation: glowPulse 2s ease-in-out infinite;
      }

      .btn:hover {
        opacity: 0.9;
        transform: translateY(-2px);
      }

      .btn svg {
        width: 1.25rem;
        height: 1.25rem;
        transition: transform 0.2s;
      }

      .btn:hover svg {
        transform: translateX(4px);
      }

      .hero-note {
        margin-top: 1rem;
        font-size: 0.875rem;
        color: var(--muted-foreground);
      }

      /* Features Section */
      .features {
        padding: 6rem 1.5rem;
        position: relative;
      }

      .features-header {
        text-align: center;
        margin-bottom: 4rem;
        animation: fadeIn 1s ease-out;
      }

      .features h2 {
        font-size: clamp(2.5rem, 5vw, 3rem);
        font-weight: bold;
        margin-bottom: 1rem;
      }

      .features h2 .highlight {
        color: var(--primary);
      }

      .features-subtitle {
        font-size: 1.25rem;
        color: var(--muted-foreground);
        max-width: 42rem;
        margin: 0 auto;
      }

      .features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1.5rem;
      }

      .feature-card {
        padding: 2rem;
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: 0.75rem;
        transition: all 0.3s;
        animation: fadeIn 1s ease-out;
      }

      .feature-card:hover {
        border-color: hsl(185, 85%, 55%, 0.5);
        box-shadow: 0 0 40px hsl(185 85% 55% / 0.3);
      }

      .feature-icon {
        width: 3rem;
        height: 3rem;
        border-radius: 0.5rem;
        background: hsl(185 85% 55% / 0.1);
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1.5rem;
        transition: background 0.3s;
      }

      .feature-card:hover .feature-icon {
        background: hsl(185 85% 55% / 0.2);
      }

      .feature-icon svg {
        width: 1.5rem;
        height: 1.5rem;
        color: var(--primary);
      }

      .feature-card h3 {
        font-size: 1.5rem;
        font-weight: 600;
        margin-bottom: 1rem;
      }

      .feature-card p {
        color: var(--muted-foreground);
        line-height: 1.7;
      }

      /* Footer */
      footer {
        padding: 3rem 1.5rem;
        border-top: 1px solid var(--border);
      }

      .footer-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
      }

      @media (min-width: 768px) {
        .footer-content {
          flex-direction: row;
          justify-content: space-between;
        }
      }

      .footer-brand h3 {
        font-size: 1.25rem;
        font-weight: bold;
        background: linear-gradient(135deg, hsl(185, 85%, 55%), hsl(200, 80%, 45%));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      .footer-brand p {
        font-size: 0.875rem;
        color: var(--muted-foreground);
        margin-top: 0.25rem;
      }

      .footer-copyright {
        font-size: 0.875rem;
        color: var(--muted-foreground);
      }
      
      .site-footer {
        padding: 2.5rem 1.5rem;
        border-top: 1px solid var(--border);
        background: var(--background);
      }

      .footer-content {
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        align-items: center;
      }

      .footer-left {
        text-align: left;
      }

      .footer-left h3 {
        margin: 0;
        font-size: 1.25rem;
      }

      .footer-left p {
        margin: 0.25rem 0 0;
        color: var(--muted-foreground);
        font-size: 0.9rem;
      }

      .footer-center {
        text-align: center;
      }

      .footer-center a {
        color: var(--muted-foreground);
        text-decoration: none;
        font-size: 0.95rem;
        padding: 0.5rem 1.25rem;
        border: 1px solid var(--border);
        border-radius: 999px;
        transition: all 0.2s ease;
      }

      .footer-center a:hover {
        background: var(--secondary);
        color: var(--primary);
      }

      .footer-right {
        text-align: right;
        color: var(--muted-foreground);
        font-size: 0.9rem;
      }

      /* Modal */
      .modal-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.8);
        z-index: 50;
        animation: fadeIn 0.2s ease-out;
      }

      .modal-overlay.active {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 1rem;
      }

      .modal {
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: 0.75rem;
        padding: 2rem;
        max-width: 28rem;
        width: 100%;
        animation: scaleIn 0.2s ease-out;
      }

      .modal h2 {
        font-size: 1.5rem;
        font-weight: bold;
        margin-bottom: 0.5rem;
      }

      .modal-description {
        color: var(--muted-foreground);
        margin-bottom: 1.5rem;
      }

      .form-group {
        margin-bottom: 1rem;
      }

      .form-input {
        width: 100%;
        padding: 0.75rem 1rem;
        background: var(--secondary);
        border: 1px solid var(--border);
        border-radius: 0.5rem;
        color: var(--foreground);
        font-size: 1rem;
        transition: border-color 0.2s;
      }

      .form-input:focus {
        outline: none;
        border-color: var(--primary);
      }

      .form-input::placeholder {
        color: var(--muted-foreground);
      }

      .form-input.error {
        border-color: hsl(0, 72%, 51%);
      }

      .error-message {
        color: hsl(0, 72%, 51%);
        font-size: 0.875rem;
        margin-top: 0.25rem;
        display: none;
      }

      .error-message.visible {
        display: block;
      }

      .btn-submit {
        width: 100%;
        padding: 0.75rem;
        background: linear-gradient(135deg, hsl(185, 85%, 55%), hsl(200, 80%, 45%));
        color: var(--primary-foreground);
        border: none;
        border-radius: 0.5rem;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        transition: opacity 0.3s;
      }

      .btn-submit:hover:not(:disabled) {
        opacity: 0.9;
      }

      .btn-submit:disabled {
        opacity: 0.6;
        cursor: not-allowed;
      }

      .loading-spinner {
        display: inline-block;
        width: 1rem;
        height: 1rem;
        border: 2px solid var(--primary-foreground);
        border-top-color: transparent;
        border-radius: 50%;
        animation: spin 0.6s linear infinite;
        margin-right: 0.5rem;
      }

      /* Toast */
      .toast {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: 0.5rem;
        padding: 1rem 1.5rem;
        box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
        animation: slideIn 0.3s ease-out;
        z-index: 100;
        max-width: 350px;
      }

      .toast.success {
        border-color: hsl(142, 71%, 45%);
      }

      .toast.error {
        border-color: hsl(0, 72%, 51%);
      }

      /* Animations */
      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(10px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      @keyframes fadeOut {
        from {
          opacity: 1;
        }
        to {
          opacity: 0;
        }
      }

      @keyframes scaleIn {
        from {
          transform: scale(0.95);
          opacity: 0;
        }
        to {
          transform: scale(1);
          opacity: 1;
        }
      }

      @keyframes pulse {
        0%, 100% {
          opacity: 1;
        }
        50% {
          opacity: 0.7;
        }
      }

      @keyframes glowPulse {
        0%, 100% {
          box-shadow: 0 0 40px hsl(185 85% 55% / 0.3);
        }
        50% {
          box-shadow: 0 0 60px hsl(185 85% 55% / 0.5);
        }
      }

      @keyframes spin {
        to {
          transform: rotate(360deg);
        }
      }

      @keyframes slideIn {
        from {
          transform: translateX(100%);
          opacity: 0;
        }
        to {
          transform: translateX(0);
          opacity: 1;
        }
      }

            /* Header Navigation */
      .site-header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        background: var(--secondary);
        border-bottom: 1px solid var(--border);
        z-index: 1000;
        backdrop-filter: blur(8px);
        padding: 0.75rem 0;
      }

      .header-container {
        display: flex;
        justify-content: space-between;
        align-items: center;
      }

      .logo {
        font-size: 1.25rem;
        font-weight: bold;
        background: linear-gradient(135deg, hsl(185, 85%, 55%), hsl(200, 80%, 45%));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      .nav-links {
        display: flex;
        gap: 1.5rem;
      }

      .nav-links a {
        color: var(--muted-foreground);
        text-decoration: none;
        font-weight: 500;
        transition: color 0.2s;
      }

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

      /* Prevent header overlap when scrolling */
      html {
        scroll-behavior: smooth;
        scroll-padding-top: 80px;
      }