:root {
  --bg: #ffffff; --fg: #111827; --muted: #6b7280; --line: #e5e7eb;
  --accent: #2563eb; --accent-fg: #ffffff; --danger: #b91c1c; --card: #f9fafb;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111318; --fg: #e5e7eb; --muted: #9ca3af; --line: #2a2e37;
          --accent: #60a5fa; --accent-fg: #0b1220; --danger: #f87171; --card: #181b22; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
header { display: flex; justify-content: space-between; align-items: center; gap: 16px;
         padding: 12px 16px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
header nav { display: flex; gap: 16px; align-items: center; }
header form { margin: 0; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
footer { max-width: 760px; margin: 0 auto; padding: 16px; font-size: 14px; }
a { color: var(--accent); }
.brand { font-weight: 600; text-decoration: none; color: var(--fg); }
.muted { color: var(--muted); }
.error { color: var(--danger); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.button, button { display: inline-block; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--accent);
                  background: var(--accent); color: var(--accent-fg); font: inherit; text-decoration: none; cursor: pointer; }
.button.secondary { background: transparent; color: var(--accent); }
button.link { background: none; border: none; color: var(--accent); padding: 0; text-decoration: underline; }
button.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
label { display: block; margin: 16px 0 4px; font-weight: 600; }
input { width: 100%; max-width: 360px; padding: 8px; border: 1px solid var(--line); border-radius: 6px;
        background: var(--bg); color: var(--fg); font: inherit; }
form button[type=submit] { margin-top: 12px; }
ul.cards { list-style: none; padding: 0; display: grid; gap: 12px; }
ul.cards li { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; }
ul.cards h2 { margin: 0 0 4px; font-size: 18px; }
dl dt { font-weight: 600; margin-top: 8px; }
dl dd { margin: 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }