:root {
  color-scheme: light dark;
  --navy: #0b1f4b;
  --accent: #0e8f9a;
  --canvas: #f5f7fb;
  --surface: #ffffff;
  --text: #122033;
  --muted: #5e6e82;
  --line: #d9e1eb;
  --danger: #b42318;
  --ok: #0e7a4b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #07111f;
    --surface: #102033;
    --text: #f5f7fb;
    --muted: #b7c3d1;
    --line: #24364c;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.45 "Segoe UI", sans-serif; background: var(--canvas); color: var(--text); }
header, main, aside, section { background: var(--surface); }
.shell { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
aside { border-right: 1px solid var(--line); padding: 20px 12px; }
main { padding: 24px; }
button, input, select, textarea { font: inherit; }
button { background: var(--navy); color: white; border: 0; border-radius: 8px; padding: 10px 14px; }
button.quiet { background: transparent; color: var(--text); border: 1px solid var(--line); }
nav button { display: block; width: 100%; text-align: left; margin: 4px 0; background: transparent; color: var(--text); }
nav button[aria-current="true"] { background: var(--accent); color: white; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 0 0 16px; }
label { display: block; margin: 10px 0; color: var(--muted); }
input, select, textarea { width: 100%; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--canvas); color: var(--text); }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.status { font-weight: 700; }
.ok { color: var(--ok); }
.bad { color: var(--danger); }
@media (max-width: 800px) {
  .shell { grid-template-columns: 1fr; }
  aside { border-right: 0; border-bottom: 1px solid var(--line); }
}