:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1a1d21;
  --muted: #6b7280;
  --border: #e2e5ea;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --ok: #15803d;
  --warn: #b45309;
  --err: #b91c1c;
  --ok-bg: #dcfce7;
  --warn-bg: #fef3c7;
  --err-bg: #fee2e2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1319;
    --panel: #171c24;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2a313c;
    --accent: #3b82f6;
    --ok: #4ade80;
    --warn: #fbbf24;
    --err: #f87171;
    --ok-bg: #12331d;
    --warn-bg: #3a2c0d;
    --err-bg: #3b1212;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
}
main { max-width: 1100px; margin: 0 auto; padding: 1.25rem 1rem 3rem; }
h1 { font-size: 1.25rem; margin: 0.5rem 0 1rem; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.6rem 1rem; background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; }
.topbar nav { display: flex; align-items: center; gap: 1rem; }
.topbar a { color: var(--text); text-decoration: none; }
.topbar a:hover { color: var(--accent); }
.inline-form { display: inline; margin: 0; }
.linklike {
  background: none; border: none; color: var(--muted);
  cursor: pointer; font-size: inherit; padding: 0;
}
.linklike:hover { color: var(--accent); }

/* system strip */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem; margin: 1rem 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 0.7rem 0.9rem; }
.card-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.card-value { font-size: 1.05rem; font-weight: 600; margin-top: 0.15rem; }
.card-sub { font-size: 0.8rem; color: var(--muted); margin-top: 0.15rem; overflow-wrap: anywhere; }

.banner { border-radius: 8px; padding: 0.6rem 0.9rem; margin: 0.75rem 0; }
.banner.ok { background: var(--ok-bg); color: var(--ok); }
.banner.err, .banner.warn { background: var(--err-bg); color: var(--err); }
.banner.warn { background: var(--warn-bg); color: var(--warn); }
.hidden { display: none; }

/* table */
.section-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; }
.add-form { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.table-wrap { overflow-x: auto; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; margin-top: 0.75rem; }
table { border-collapse: collapse; width: 100%; min-width: 900px; }
th, td { text-align: left; padding: 0.5rem 0.65rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
tr:last-child td { border-bottom: none; }
td.empty { text-align: center; color: var(--muted); padding: 1.5rem; }
.tail-cell { font-weight: 700; }
.age-ok { color: var(--ok); }
.age-warn { color: var(--warn); }
.age-err { color: var(--err); }
.err-cell { color: var(--err); white-space: normal; max-width: 220px; }
.muted { color: var(--muted); }

/* inputs */
input, select, button {
  font: inherit; color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 0.4rem 0.6rem;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button { cursor: pointer; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
button.danger { color: var(--err); }
table input[type="text"] { width: 9rem; }
table input[type="checkbox"] { width: auto; accent-color: var(--accent); }

/* login */
.login-box { max-width: 320px; margin: 12vh auto; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 1.5rem; }
.login-box form { display: flex; flex-direction: column; gap: 0.6rem; }
.error { color: var(--err); }

/* settings */
.settings-form { max-width: 560px; display: flex; flex-direction: column; gap: 1rem; }
fieldset { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; display: flex; flex-direction: column; gap: 0.75rem; }
legend { font-weight: 700; padding: 0 0.4rem; }
.settings-form label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.9rem; }
.hint { color: var(--muted); font-size: 0.85rem; margin: 0; }