@layer reset, base, layout, components, utilities;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body, h1, h2, h3, p, ul { margin: 0; }
  ul { padding: 0; list-style: none; }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }
}

@layer base {
  :root {
    color-scheme: light;
    --bg: #fdfdfd;
    --text: #0f0f0f;
    --muted: #4a4a4a;
    --line: #0f0f0f;
    --accent: #0f0f0f;
    --radius: 14px;
    --grid-max: 1080px;
    font-family: "Space Grotesk", system-ui, -apple-system, sans-serif;
    background: var(--bg);
  }

  body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
  }
}

@layer layout {
  .page {
    padding: 36px clamp(18px, 3vw, 32px) 72px;
    max-width: var(--grid-max);
    margin: 0 auto;
    display: grid;
    gap: 48px;
  }

  header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px 20px;
    position: sticky;
    top: 12px;
    backdrop-filter: blur(6px);
    background: rgba(253, 253, 253, 0.92);
  }

  nav ul {
    display: flex;
    gap: 16px;
    font-weight: 600;
  }

  main {
    display: grid;
    gap: 42px;
  }

  .section {
    display: grid;
    gap: 16px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .split {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  }

  footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px 20px;
  }

  footer a {
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  footer a:is(:hover, :focus-visible) {
    opacity: 0.85;
  }
}

@layer components {
  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    letter-spacing: 0.3px;
  }

  .brand__mark {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1.5px solid var(--line);
    display: grid;
    place-items: center;
    font-family: "IBM Plex Mono", monospace;
    font-weight: 600;
  }

  h1 {
    font-size: clamp(2rem, 4vw, 2.7rem);
    line-height: 1.2;
    letter-spacing: -0.5px;
  }

  h2 {
    font-size: 1.2rem;
    letter-spacing: -0.1px;
  }

  .muted { color: var(--muted); }

  .pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border: 1.5px solid var(--line);
    border-radius: 12px;
    font-weight: 700;
    transition: transform 150ms ease;
  }

  .btn:is(:hover, :focus-visible) { transform: translateY(-2px); }

  .list {
    display: grid;
    gap: 10px;
  }

  .list li {
    display: flex;
    gap: 10px;
  }

  .list li::before {
    content: "—";
    font-family: "IBM Plex Mono", monospace;
  }

  .card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px;
  }

  .mono {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.92rem;
  }
}

@layer utilities {
  .grid-two {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .stack { display: grid; gap: 8px; }
}

@media (max-width: 720px) {
  header { position: static; }
  nav ul { flex-wrap: wrap; }
}