:root {
  --bg: #F5FAF9; --card: #FFFFFF; --text: #1B2B2E; --muted: #5A6D70;
  --accent: #0F4C5C; --line: #DDE8E6;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0E1A1C; --card: #152427; --text: #E6EEEE; --muted: #9DB0B2; --accent: #7CC4D3; --line: #24383B; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin: 24px 0; }
.card p { margin: 4px 0; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: .9rem; color: var(--muted); }
[hidden] { display: none !important; }
.status { font-weight: 600; }
.status.ok { color: #1E8A5A; }
.status.err { color: #C0392B; }
.status.err:empty { display: none; }
@media (prefers-color-scheme: dark) { .status.ok { color: #5FD39A; } .status.err { color: #FF8A7A; } }
label { display: block; font-weight: 600; margin: 12px 0 4px; }
input { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.hint { color: var(--muted); font-size: .9rem; }
button { margin-top: 12px; width: 100%; font: inherit; font-weight: 600; padding: 12px; border: 0; border-radius: 8px; background: var(--accent); color: var(--card); cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }