:root {
  --bg: #f2f3f7;
  --card: #ffffff;
  --text: #11131a;
  --muted: #5f6573;
  --accent: #2f5bea;
  --accent-soft: #e7edff;
  --border: #dde1ea;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1015;
    --card: #1a1d24;
    --text: #f2f3f7;
    --muted: #9aa0ad;
    --accent: #6e8eff;
    --accent-soft: #1e2748;
    --border: #2e333d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

header {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 800; font-size: 20px; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }

nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 14px; }
nav a:hover { color: var(--accent); }

main {
  max-width: 820px;
  margin: 0 auto 48px;
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
}

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 6px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }

table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }

.callout { background: var(--accent-soft); border-radius: 12px; padding: 14px 16px; margin: 16px 0; }
.todo { background: #fff4e0; color: #8a5300; padding: 0 4px; border-radius: 4px; }

.hero { text-align: center; padding: 16px 0 8px; }
.hero img { width: 96px; height: 96px; border-radius: 22px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 24px; }
.feature { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.feature strong { display: block; margin-bottom: 4px; }

footer { max-width: 820px; margin: 0 auto; padding: 0 16px 40px; color: var(--muted); font-size: 14px; text-align: center; }
footer a { color: var(--muted); margin: 0 8px; }