:root {
  --bg: #f4f6fb; --card: #fff; --text: #1b2430; --muted: #5b6776; --line: #dde3ee;
  --accent: #2459d6; --accent-text: #fff; --err: #b3261e; --err-bg: #fdecea; --ok-bg: #e8f3ec; --ok: #1e6b3a;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #10151d; --card: #182030; --text: #e8edf5; --muted: #9aa7ba; --line: #2b374b;
          --accent: #6b9bff; --accent-text: #0b1020; --err: #ff8b84; --err-bg: #3a1a19; --ok-bg: #16301f; --ok: #7bd69a; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; padding: .75rem 1rem; background: var(--card); border-bottom: 1px solid var(--line); }
.topbar nav { display: flex; gap: 1rem; align-items: center; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
a { color: var(--accent); }
.container { flex: 1; width: 100%; max-width: 720px; margin: 0 auto; padding: 1.25rem 1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1.5rem; }
.narrow { max-width: 440px; margin: 1rem auto; }
h1 { margin-top: 0; font-size: 1.5rem; }
label { display: block; margin: 1rem 0 .25rem; font-weight: 600; }
input { width: 100%; padding: .65rem .75rem; font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
input:focus-visible, .btn:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.btn { display: inline-block; margin-top: 1.25rem; padding: .65rem 1.1rem; font: inherit; font-weight: 600; color: var(--accent-text); background: var(--accent); border: 0; border-radius: 8px; text-decoration: none; cursor: pointer; }
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.row { display: flex; gap: .75rem; flex-wrap: wrap; }
.row form { margin: 0; }
form.inline { display: inline; margin: 0; }
button.link { background: none; border: 0; padding: 0; font: inherit; color: var(--accent); cursor: pointer; text-decoration: underline; }
.error { color: var(--err); background: var(--err-bg); padding: .5rem .75rem; border-radius: 8px; margin: .5rem 0 0; }
.notice { color: var(--ok); background: var(--ok-bg); padding: .5rem .75rem; border-radius: 8px; }
.muted { color: var(--muted); }
.grid { display: grid; grid-template-columns: max-content 1fr; gap: .4rem 1.25rem; margin: 1rem 0; }
.grid dt { color: var(--muted); } .grid dd { margin: 0; word-break: break-word; }
.footer { text-align: center; color: var(--muted); font-size: .85rem; padding: 1rem; }
@media (max-width: 480px) { .grid { grid-template-columns: 1fr; gap: 0; } .grid dd { margin-bottom: .6rem; } .btn { width: 100%; text-align: center; } }