:root {
    --bg: #060714;
    --bg-alt: #0c0f1f;
    --card-bg: #121528;
    --text: #f5f7ff;
    --muted: #9ca3c7;
    --accent: #4f46e5;
    --accent-soft: rgba(79, 70, 229, 0.15);
    --border: #1f233a;
    --radius: 10px;
    --shadow: 0 18px 45px rgba(15, 23, 42, 0.8);
    --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  html,
  body {
    margin: 0;
    padding: 0;
    background: radial-gradient(circle at top, #111827 0, #020617 45%, #020617 100%);
    color: var(--text);
    font-family: var(--font-main);
    -webkit-font-smoothing: antialiased;
  }
  
  a {
    color: var(--accent);
    text-decoration: none;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  .container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1.5rem;
  }
  
  .section {
    padding: 3.5rem 0;
  }
  
  .section-alt {
    background: radial-gradient(circle at top left, #020617 0, #020617 40%, #050816 100%);
  }
  
  h1,
  h2,
  h3 {
    margin: 0 0 0.75rem;
    letter-spacing: 0.02em;
  }
  
  h1 {
    font-size: 2.1rem;
    font-weight: 700;
  }
  
  h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
  }
  
  h3 {
    font-size: 1.1rem;
  }
  
  p {
    margin: 0 0 0.75rem;
    color: var(--muted);
    line-height: 1.6;
  }
  
  /* Header */
  
  .site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(18px);
    background: linear-gradient(to bottom, rgba(2, 6, 23, 0.92), rgba(2, 6, 23, 0.7));
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  }
  
  .header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 0;
  }
  
  .tagline {
    font-size: 0.9rem;
    color: var(--muted);
  }
  
  /* Nav */
  
  .nav-links {
    display: flex;
    gap: 0.75rem;
    font-size: 0.9rem;
  }
  
  .nav-links a {
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    color: #e5e7eb;
    border: 1px solid transparent;
    background: transparent;
    transition: all 0.18s ease-out;
  }
  
  .nav-links a:hover {
    border-color: rgba(148, 163, 184, 0.5);
    background: rgba(15, 23, 42, 0.8);
  }
  
  /* Cards & layout */
  
  .card {
    background: radial-gradient(circle at top left, #111827, #020617);
    border-radius: var(--radius);
    padding: 1.4rem 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.35);
    box-shadow: var(--shadow);
    margin-bottom: 1.3rem;
  }
  
  .card .meta {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 0.6rem;
  }
  
  .card ul {
    margin: 0.4rem 0 0;
    padding-left: 1.25rem;
    color: var(--muted);
  }
  
  .card ul li {
    margin-bottom: 0.4rem;
  }
  
  .card-grid {
    display: grid;
    gap: 1.1rem;
  }
  
  @media (min-width: 720px) {
    .card-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }
  }
  
  /* Contact */
  
  .contact-list {
    list-style: none;
    padding: 0;
    margin: 0.75rem 0 0;
  }
  
  .contact-list li {
    margin-bottom: 0.4rem;
  }
  
  /* Footer */
  
  .site-footer {
    border-top: 1px solid rgba(148, 163, 184, 0.18);
    padding: 1rem 0 1.5rem;
    background: rgba(2, 6, 23, 0.98);
  }
  
  .footer-content {
    text-align: center;
    font-size: 0.8rem;
    color: var(--muted);
  }
  
  /* Small screens */
  
  @media (max-width: 640px) {
    .header-content {
      flex-direction: column;
      align-items: flex-start;
      gap: 0.4rem;
    }
  
    h1 {
      font-size: 1.6rem;
    }
  
    .section {
      padding: 2.5rem 0;
    }
  }