:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --border: #e3e5e8;
  --primary: #1f6feb;
  --primary-text: #ffffff;
  --danger: #c62828;
  --ok: #2e7d32;
  --warn: #b26a00;
  --radius: 12px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1b1e24;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --border: #2c3038;
    --primary: #4c8dff;
    --danger: #ff6b6b;
    --ok: #5cc26b;
    --warn: #f0a742;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

header .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 16px;
}

header nav {
  display: flex;
  gap: 4px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 12px 8px;
  overflow-x: auto;
}

header nav a {
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

header nav a.active {
  background: var(--primary);
  color: var(--primary-text);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

h1, h2, h3 { margin: 0 0 12px; line-height: 1.25; }
h2 { font-size: 20px; }
h3 { font-size: 17px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.stack > * + * { margin-top: 8px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.field {
  display: block;
  margin-bottom: 12px;
}

.field span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 14px;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

input[type="checkbox"] { width: auto; }

.btn {
  display: inline-block;
  width: 100%;
  padding: 12px 16px;
  font: inherit;
  font-weight: 600;
  color: var(--primary-text);
  background: var(--primary);
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

.btn + .btn { margin-top: 8px; }
.btn.small { width: auto; padding: 6px 12px; font-size: 14px; margin-top: 0; }
.btn.secondary { color: var(--primary); background: transparent; border: 1px solid var(--primary); }
.btn.danger { background: var(--danger); }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn.busy::after { content: " …"; }
.btn.big { padding: 18px; font-size: 18px; }

button.link {
  padding: 0;
  font: inherit;
  color: var(--primary);
  background: none;
  border: none;
  cursor: pointer;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 13px;
  border-radius: 999px;
  background: var(--border);
}

.badge.ok { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.badge.warn { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.badge.danger { background: color-mix(in srgb, var(--danger) 18%, transparent); color: var(--danger); }

.muted { color: var(--muted); }
.center { text-align: center; }
.error { color: var(--danger); }
.hidden { display: none; }
.mono { font-family: ui-monospace, monospace; word-break: break-all; }

.hint {
  padding: 12px;
  margin-bottom: 12px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  padding: 8px 6px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

.table-wrap { overflow-x: auto; }

.cells {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
  gap: 6px;
}

.cell {
  padding: 6px;
  text-align: center;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.cell.taken { background: color-mix(in srgb, var(--primary) 15%, transparent); }
.cell.open { border-color: var(--warn); border-width: 2px; }
.cell.alarm { background: color-mix(in srgb, var(--danger) 25%, transparent); }
.cell.disabled { opacity: 0.4; }

#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  max-width: 90vw;
  padding: 12px 18px;
  color: #fff;
  background: #333;
  border-radius: 10px;
  transform: translateX(-50%) translateY(200%);
  transition: transform 0.25s;
  z-index: 100;
}

#toast.show { transform: translateX(-50%) translateY(0); }
#toast.error { background: var(--danger); }