:root {
  --bg: #ffffff;
  --fg: #1f2933;
  --muted: #52606d;
  --line: #d9e2ec;
  --accent: #3b82f6;
  --danger: #c0392b;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --line: #374151;
    --danger: #ef6b5f;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 36rem;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

h1 { font-size: 1.6rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; border-top: 1px solid var(--line); padding-top: 1.5rem; }
.muted { color: var(--muted); }
.footer { margin-top: 3rem; font-size: 0.9rem; color: var(--muted); }
a { color: var(--accent); }

/* `hidden` must win over any display rule below — without this, a rule like
   `#passkeys li .confirm { display: flex }` out-specifies the browser's own
   [hidden] style and every passkey's remove confirmation shows at once. */
[hidden] { display: none !important; }

button {
  font: inherit;
  padding: 0.55rem 1rem;
  border-radius: 0.4rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { border-color: var(--danger); color: var(--danger); }
button.link { border: 0; padding: 0; color: var(--accent); text-decoration: underline; }
button:disabled { opacity: 0.5; cursor: default; }

label { display: block; margin-top: 0.75rem; }
input {
  font: inherit;
  width: 100%;
  box-sizing: border-box;
  padding: 0.5rem;
  margin: 0.25rem 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: transparent;
  color: var(--fg);
}

details { margin-top: 1.5rem; }
summary { cursor: pointer; color: var(--accent); }
#apps li { margin: 0.4rem 0; }
#passkeys { padding-left: 0; list-style: none; }
#passkeys li { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; justify-content: space-between;
  padding: 0.5rem 0; border-bottom: 1px solid var(--line); }
#passkeys li .confirm { width: 100%; display: flex; gap: 0.5rem; align-items: center; }
#sessions { padding-left: 0; list-style: none; }
#sessions li { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; justify-content: space-between;
  padding: 0.5rem 0; border-bottom: 1px solid var(--line); }
#sessions .when { width: 100%; color: var(--muted); font-size: 0.9rem; }
.confirm-box { margin-top: 1rem; padding: 1rem; border: 1px solid var(--danger); border-radius: 0.4rem; }
#status { padding: 0.75rem; border: 1px solid var(--line); border-radius: 0.4rem; }
#delete-confirm { margin-top: 1rem; padding: 1rem; border: 1px solid var(--danger); border-radius: 0.4rem; }