:root {
  color-scheme: light;
  --ink: #1e2a26;
  --muted: #5b6b64;
  --paper: #f7f4ee;
  --card: #ffffff;
  --line: #e2ddd0;
  --accent: #2f6f5e;
  --accent-dark: #1f4f42;
  --warn-bg: #fff3cd;
  --warn-border: #f0c36d;
  --warn-ink: #663c00;
  --note-bg: #eef2f6;
  --note-border: #c7d2dc;
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  line-height: 1.55;
  background: var(--paper);
  color: var(--ink);
}

.banner {
  background: var(--warn-bg);
  color: var(--warn-ink);
  border: 1px solid var(--warn-border);
  border-radius: 0.6rem;
  padding: 0.85rem 1.1rem;
  margin: 1.25rem 0 2rem;
  font-size: 0.88rem;
}

.banner a { color: var(--warn-ink); font-weight: 600; }

header {
  padding: 1.5rem 0 1rem;
  border-bottom: 3px solid var(--accent);
  margin-bottom: 1.75rem;
}

header h1 {
  margin: 0 0 0.35rem;
  font-size: 2rem;
  letter-spacing: -0.02em;
  color: var(--accent-dark);
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  padding: 1.25rem 1.4rem;
  margin-bottom: 1.1rem;
}

.card.highlight {
  border-color: var(--accent);
  border-width: 2px;
  box-shadow: 0 2px 0 0 var(--accent);
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--accent-dark);
}

.card p { margin: 0; }
.card p + p { margin-top: 0.6rem; }

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}

@media (max-width: 30rem) {
  .grid { grid-template-columns: 1fr; }
}

.note {
  background: var(--note-bg);
  border: 1px solid var(--note-border);
  border-radius: 0.75rem;
  padding: 1.1rem 1.3rem;
  margin: 2rem 0;
  font-size: 0.92rem;
  color: var(--ink);
}

.note h2 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.note code {
  background: rgba(0, 0, 0, 0.06);
  padding: 0.1rem 0.35rem;
  border-radius: 0.3rem;
  font-size: 0.88em;
}

footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted);
}

footer a { color: var(--muted); }