:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #5a5a5a;
  --line: #e6e6e6;
  --card: #fafafa;
  --link: #111111;
  --max: 860px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --fg: #f2f2f2;
    --muted: #b8b8b8;
    --line: #2a2a2a;
    --card: #141414;
    --link: #f2f2f2;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.55;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover { opacity: 0.85; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 18px 56px;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0 18px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

nav a[aria-current="page"] {
  border-bottom-color: var(--fg);
}

h1, h2 {
  margin: 0 0 12px 0;
  line-height: 1.2;
}

h1 { font-size: 28px; letter-spacing: -0.01em; }
h2 { font-size: 18px; margin-top: 26px; }

p { margin: 0 0 12px 0; color: var(--fg); }

.muted { color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-top: 18px;
}

.btnrow {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--fg);
  text-decoration: none;
}

.btn.secondary {
  border-color: var(--line);
  background: transparent;
}

footer {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

ul { margin: 0 0 12px 18px; }
li { margin: 6px 0; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 22px 0;
}