:root {
  color-scheme: light;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --link: #1d4ed8;
  --border: #dbe3ee;
  --accent: #047857;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0b0f19;
    --card: #151d30;
    --text: #f8fafc;
    --muted: #cbd5e1;
    --link: #93c5fd;
    --border: #334155;
    --accent: #6ee7b7;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 32px auto;
  padding: clamp(24px, 5vw, 48px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
}

nav { margin-bottom: 28px; }
h1 { line-height: 1.15; margin: 0 0 8px; }
h2 { line-height: 1.25; margin: 34px 0 10px; }
p, li { color: var(--muted); }
strong { color: var(--text); }
a { color: var(--link); text-underline-offset: 3px; }
a:focus-visible {
  outline: 3px solid var(--link);
  outline-offset: 3px;
}
.effective { margin-top: 0; }
.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: 8px;
}
footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding-top: 20px;
  color: var(--muted);
}

@media (max-width: 480px) {
  main { width: min(100% - 20px, 760px); margin: 10px auto; border-radius: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}