:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --text: #1a1f29;
  --muted: #545d6b;
  --line: #d6dbe3;
  --primary: #1f4fd1;
  --primary-text: #ffffff;
  --focus: #f59e0b;
  --up: #c62828;
  --down: #1556b8;
  --ok: #1b7f3b;
  --ok-bg: #e5f4ea;
  --warn: #8a5300;
  --warn-bg: #fff3dc;
  --err: #b3261e;
  --err-bg: #fdeceb;
  --mock: #7a2e00;
  --mock-bg: #ffe2c7;
  --radius: 10px;
  --gap: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); min-height: 100vh; overflow-x: hidden; }
[hidden] { display: none !important; }

h2 { font-size: 1.05rem; margin: 0 0 12px; }
.mt { margin-top: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* 머리글 */
.top {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: var(--gap); flex-wrap: wrap;
  padding: 10px 24px; background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-name { font-weight: 700; font-size: 1.2rem; letter-spacing: .02em; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .85rem; font-weight: 700; white-space: nowrap; }
.badge-mock { background: var(--mock-bg); color: var(--mock); border: 1px solid #f0b88a; }
.engine { display: flex; align-items: center; gap: 8px; }
.engine .label { color: var(--muted); font-size: .9rem; }
.status { padding: 2px 10px; border-radius: 999px; font-weight: 600; font-size: .9rem; }
.status-off { background: #eceff3; color: var(--muted); }
.status-starting { background: var(--warn-bg); color: var(--warn); }
.status-running { background: var(--ok-bg); color: var(--ok); }
.status-faulted { background: var(--err-bg); color: var(--err); }
.top-actions { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }

.problem { margin: 12px 24px 0; padding: 10px 14px; border-radius: var(--radius); background: var(--err-bg); color: var(--err); font-weight: 600; }

/* 단추 */
.btn {
  font: inherit; font-size: .95rem; min-height: 40px; padding: 6px 14px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--text);
}
.btn:hover { background: #eef1f6; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); font-weight: 600; }
.btn-primary:hover { background: #183fae; }
.btn-danger { color: var(--err); border-color: #e7b3af; }
.btn-danger.armed { background: var(--err); color: #fff; }
.btn-quiet { border-color: transparent; color: var(--muted); }
.btn-small { min-height: 34px; padding: 4px 10px; font-size: .88rem; }

/* 탭 */
.tabs { display: flex; gap: 4px; padding: 12px 24px 0; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tabs [role="tab"] {
  font: inherit; font-weight: 600; padding: 10px 18px; min-height: 44px; cursor: pointer;
  border: 1px solid transparent; border-bottom: none; border-radius: 8px 8px 0 0; background: none; color: var(--muted);
}
.tabs [role="tab"][aria-selected="true"] { background: var(--surface); border-color: var(--line); color: var(--primary); margin-bottom: -1px; }

main { padding: var(--gap) 24px 32px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: var(--gap); }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--gap); align-items: start; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; min-width: 0; }
.hint { color: var(--muted); font-size: .9rem; margin: 4px 0 12px; }
.empty { color: var(--muted); margin: 12px 0 0; }

/* 표 */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { padding: 8px 6px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: .85rem; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.up { color: var(--up); }
.down { color: var(--down); }
.sub { color: var(--muted); font-size: .82rem; }

/* 세트 */
.set-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: var(--gap); }
.set-card h3 { margin: 0; font-size: 1.05rem; }
.set-card .set-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.set-card dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 12px 0; font-size: .92rem; }
.set-card dt { color: var(--muted); }
.set-card dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
.set-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.pill { padding: 2px 10px; border-radius: 999px; font-size: .85rem; font-weight: 600; }
.pill-on { background: var(--ok-bg); color: var(--ok); }
.pill-off { background: #eceff3; color: var(--muted); }
.pill-warn { background: var(--warn-bg); color: var(--warn); }

/* 로그 */
.logs { list-style: none; margin: 0; padding: 0; max-height: 70vh; overflow-y: auto; font-size: .92rem; }
.logs li { display: grid; grid-template-columns: 5.5em 4em 1fr; gap: 8px; padding: 6px 0; border-bottom: 1px solid var(--line); }
.logs time { color: var(--muted); font-variant-numeric: tabular-nums; }
.lv { font-weight: 700; font-size: .82rem; }
.lv-Info { color: var(--muted); }
.lv-Warning { color: var(--warn); }
.lv-Error { color: var(--err); }
.logs .msg { overflow-wrap: anywhere; }

/* 폼 */
label { display: block; font-weight: 600; font-size: .9rem; margin: 12px 0 4px; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="time"], select {
  width: 100%; font: inherit; min-height: 42px; padding: 8px 10px;
  border: 1px solid #a9b2bf; border-radius: 8px; background: #fff; color: var(--text);
}
fieldset { border: 1px solid var(--line); border-radius: 8px; margin: 12px 0 0; padding: 4px 12px 12px; min-width: 0; }
legend { font-weight: 700; font-size: .92rem; padding: 0 4px; }
.check { display: flex; align-items: center; gap: 8px; margin-top: 10px; }
.check input { width: 20px; height: 20px; margin: 0; }
.check label { margin: 0; font-weight: 500; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-actions { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }
.error { color: var(--err); background: var(--err-bg); border-radius: 8px; padding: 8px 10px; margin: 12px 0 0; font-size: .92rem; }
.error ul { margin: 4px 0 0; padding-left: 18px; }

/* 덮개 */
.overlay {
  position: fixed; inset: 0; z-index: 50; display: flex; align-items: flex-start; justify-content: center;
  padding: 6vh 16px; background: rgba(20, 26, 38, .55); overflow-y: auto;
}
.dialog { width: 100%; max-width: 420px; background: var(--surface); border-radius: 14px; padding: 20px 22px; box-shadow: 0 12px 40px rgba(0, 0, 0, .25); }
.dialog-wide { max-width: 560px; }
.dialog-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.dialog-head h2 { margin: 0; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 60;
  max-width: min(560px, calc(100vw - 32px)); padding: 10px 16px; border-radius: 10px;
  background: #1a1f29; color: #fff; box-shadow: 0 6px 20px rgba(0, 0, 0, .25);
}

@media (max-width: 640px) {
  .top { padding: 10px 16px; gap: 10px; }
  .top-actions { margin-left: 0; width: 100%; }
  .top-actions .btn { flex: 1 1 auto; }
  .tabs { padding: 8px 16px 0; }
  .tabs [role="tab"] { padding: 10px 12px; }
  main { padding: 12px 16px 24px; }
  .problem { margin: 12px 16px 0; }
  .grid-2, .row-2, .set-list { grid-template-columns: minmax(0, 1fr); }
}