:root {
  --teal: #1B7A75; --deep: #0F2E2C; --ink: #14201F; --muted: #4A6563;
  --bg: #F4F7F6; --card: #FFFFFF; --line: #DCE5E3;
}
@media (prefers-color-scheme: dark) {
  :root { --teal: #4FB8B0; --deep: #0B1F1E; --ink: #E8F1EF; --muted: #9FBAB7; --bg: #101716; --card: #17201F; --line: #26332F; }
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.65; font-size: 17px; }
header { background: var(--deep); color: #fff; }
header .inner, nav ul, main, footer .inner { max-width: 760px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
header .inner { padding-top: 28px; padding-bottom: 24px; }
header .brand { font-weight: 700; letter-spacing: .02em; opacity: .85; font-size: 15px; }
header h1 { margin: 6px 0 0; font-size: 30px; line-height: 1.2; }
nav { background: var(--card); border-bottom: 1px solid var(--line); }
nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 20px; padding-top: 12px; padding-bottom: 12px; margin: 0 auto; }
nav a { color: var(--teal); text-decoration: none; font-weight: 600; }
nav a[aria-current="page"] { color: var(--ink); }
main { padding-top: 28px; padding-bottom: 48px; }
section { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 4px 22px 14px; margin-bottom: 16px; }
h2 { font-size: 20px; margin: 18px 0 6px; }
p, li { color: var(--ink); }
.meta, .note { color: var(--muted); font-size: 15px; }
a { color: var(--teal); }
footer { color: var(--muted); font-size: 14px; }
footer .inner { padding-top: 8px; padding-bottom: 32px; }