:root {
  --bg: #0f1419;
  --panel: #1a222c;
  --text: #e8eef4;
  --muted: #9aabbc;
  --accent: #f07c2e;
  --line: #2a3542;
  --link: #7ec8ff;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --display: "IBM Plex Serif", Georgia, serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, #243041 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #2a1f14 0%, transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

.top {
  padding: 1.5rem 1.25rem 0.5rem;
  max-width: 820px;
  margin: 0 auto;
}
.brand {
  font-family: var(--display);
  font-size: 1.35rem;
  letter-spacing: 0.02em;
  color: var(--accent);
}
.tag { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.95rem; }

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 1rem 1.25rem 3rem;
}

.hero h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  line-height: 1.2;
  margin: 1rem 0 0.75rem;
}
.hero p { color: var(--muted); max-width: 40rem; }
.meta { font-size: 0.9rem; }
.meta a, a { color: var(--link); }

.cards {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.card h2 {
  font-family: var(--display);
  font-size: 1.25rem;
  margin: 0 0 0.4rem;
  color: var(--text);
}
.card p { margin: 0; color: var(--muted); }

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.5rem 0 1.5rem;
  font-size: 0.95rem;
}
.nav a { text-decoration: none; }
.nav a:hover { text-decoration: underline; }

article h1 {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  margin: 0.5rem 0 1rem;
}
article h2 {
  font-family: var(--display);
  font-size: 1.25rem;
  margin: 2rem 0 0.6rem;
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}
article h3 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.4rem;
  color: #d5e0ea;
}
article p, article li { color: #c5d0db; }
article ul, article ol { padding-left: 1.25rem; }
article code, article pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
}
article code {
  background: #121820;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
article pre {
  background: #121820;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  color: #dce7f2;
}
.callout {
  background: #1c2834;
  border-left: 3px solid var(--accent);
  padding: 0.85rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
}
.callout strong { color: var(--text); }