:root {
    --bg: #ffffff;
    --bg-light: #f8fafc;
    --surface: #ffffff;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --accent-dark: #1d4ed8;
    --muted: #64748b;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --radius: 1.25rem;
  }
  
  * {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #ffffff;
    color: var(--text-primary);
    line-height: 1.6;
  }
  
  a {
    color: inherit;
    text-decoration: none;
  }
  
  img {
    max-width: 100%;
    display: block;
  }
  
  .container {
    width: min(1100px, 100%);
    margin: 0 auto;
    padding: 0 1.5rem;
  }
  
  .topbar {
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
    z-index: 100;
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  }
  
  .nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
  }
  
  .logo {
    display: flex;
    align-items: center;
    height: 100%;
  }
  
  .logo img {
    height: 40px;
    width: auto;
    display: block;
  }
  
  .main-nav {
    display: flex;
    gap: 1rem;
    align-items: center;
  }
  
  .main-nav a {
    font-size: 0.9rem;
    padding: 0.4rem 0.6rem;
    border-radius: 9999px;
    transition: 0.2s ease;
  }
  
  .main-nav a:hover,
  .main-nav a.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--accent);
  }
  
  .btn {
    background: var(--accent);
    border: none;
    color: #ffffff;
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: 9999px;
    cursor: pointer;
    transition: 0.2s ease;
  }
  
  .btn:hover {
    background: var(--accent-dark);
    filter: brightness(1.05);
  }
  
  .btn-small {
    padding: 0.4rem 0.9rem;
  }
  
  .btn.ghost {
    background: rgba(37, 99, 235, 0.08);
    color: var(--accent);
    border: 1px solid rgba(37, 99, 235, 0.2);
  }
  
  .btn.ghost:hover {
    background: rgba(37, 99, 235, 0.12);
  }
  
  .hero {
    padding: 4.5rem 0 3.5rem 0;
    background: radial-gradient(circle at top, rgba(37, 99, 235, 0.08), rgba(255, 255, 255, 1) 45%);
  }
  
  .hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: center;
  }
  
  .badge {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 9999px;
    padding: 0.25rem 0.7rem;
    font-size: 0.7rem;
    margin-bottom: 1rem;
    color: var(--accent);
  }
  
  .hero h1 {
    font-size: clamp(2.4rem, 4vw, 3.1rem);
    line-height: 1.1;
    margin-bottom: 1rem;
  }
  
  .lead {
    color: var(--text-secondary);
    margin-bottom: 1.4rem;
  }
  
  .hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  
  .hero-meta {
    display: flex;
    gap: 2rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
  }
  
  .hero-img {
    border-radius: 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    box-shadow: 0 10px 40px rgba(37, 99, 235, 0.15);
  }
  
  .section {
    padding: 3.5rem 0;
  }
  
  .section-alt {
    background: var(--bg-light);
  }
  
  h1, h2, h3, h4 {
    color: var(--text-primary);
  }
  
  .section-title {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
  }
  
  .section-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
  }
  
  .grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.8rem;
  }
  
  .card {
    background: var(--bg);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  }
  
  .card:hover {
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.3);
  }
  
  .card h3 {
    margin-top: 0;
  }
  
  .project-card img {
    border-radius: 0.6rem;
    margin-bottom: 1rem;
    width: 100%;
    height: 200px;
    object-fit: cover;
  }
  
  .two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: center;
  }
  
  .checklist {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 0 0;
  }
  
  .checklist li {
    margin-bottom: 0.6rem;
    padding-left: 1.2rem;
    position: relative;
  }
  
  .checklist li::before {
    content: "•";
    color: var(--accent);
    position: absolute;
    left: 0;
  }
  
  .rounded-img {
    border-radius: 1.3rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
  }
  
  .footer {
    background: var(--bg-light);
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid rgba(148, 163, 184, 0.2);
  }
  
  .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
  }
  
  .footer h4 {
    margin-bottom: 0.6rem;
  }
  
  .footer a {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
  }
  
  .footer a:hover {
    color: var(--accent);
  }
  
  .footer-bottom {
    text-align: center;
    padding: 1.5rem 0 1.5rem;
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
  }
  
  .page-hero {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.05), var(--bg-light));
    padding: 3rem 0 2.5rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  }
  
  .contact-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 2.5rem;
  }
  
  .contact-form {
    background: var(--bg);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  }
  
  .form-group {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }
  
  input, textarea, select {
    background: var(--bg);
    border: 1px solid rgba(148, 163, 184, 0.3);
    border-radius: 0.6rem;
    padding: 0.5rem 0.6rem;
    color: var(--text-primary);
    font-family: inherit;
  }
  
  input:focus, textarea:focus, select:focus {
    outline: 1px solid rgba(37, 99, 235, 0.7);
    border-color: rgba(37, 99, 235, 0.4);
  }
  
  .mobile-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.4rem;
  }
  
  article code {
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 0.3rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--accent);
  }
  
  article h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.4rem;
  }
  
  article p {
    margin-bottom: 1.2rem;
    line-height: 1.7;
  }
  
  @media (max-width: 900px) {
    .hero-grid, .two-col, .contact-grid {
      grid-template-columns: 1fr;
    }
    .hero {
      padding-top: 5.5rem;
    }
    .main-nav {
      position: absolute;
      top: 64px;
      right: 1.5rem;
      background: rgba(255, 255, 255, 0.98);
      border: 1px solid rgba(148, 163, 184, 0.2);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      flex-direction: column;
      gap: 0.5rem;
      padding: 1rem;
      border-radius: 1rem;
      display: none;
    }
    .main-nav.open {
      display: flex;
    }
    .mobile-toggle {
      display: block;
    }
    .hero-actions {
      flex-wrap: wrap;
    }
  }