:root {
  color-scheme: light dark;
  --background: #fffaf5;
  --surface: rgba(255, 255, 255, 0.82);
  --text: #2b211b;
  --muted: #6f6259;
  --accent: #b44824;
  --border: #e8d9cd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #1d1815;
    --surface: rgba(45, 36, 31, 0.9);
    --text: #fff5ec;
    --muted: #cbb9ab;
    --accent: #ff9a70;
    --border: #5a463a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 90% 0%, rgba(224, 104, 57, 0.16), transparent 32rem),
    var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
}

main {
  width: min(100% - 2rem, 760px);
  margin: 0 auto;
  padding: 4rem 0;
}

header { margin-bottom: 2.5rem; }
h1 { margin: 0 0 0.5rem; font-size: clamp(2rem, 7vw, 3.5rem); line-height: 1.2; }
h2 { margin-top: 2.5rem; line-height: 1.4; }
p, li { overflow-wrap: anywhere; }
.lead { color: var(--muted); font-size: 1.08rem; }
.card {
  margin: 1rem 0;
  padding: 1.25rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}
a { color: var(--accent); text-underline-offset: 0.2em; }
nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; margin-top: 1.5rem; }
footer { margin-top: 3rem; color: var(--muted); font-size: 0.9rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }