:root {
  --blue: #2563eb;
  --blue-dark: #1e3a8a;
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  color: white;
  padding: 28px 20px 22px;
  text-align: center;
}

.topbar h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
}

.subtitle {
  margin: 0;
  opacity: 0.85;
  font-size: 0.9rem;
}

.container {
  flex: 1;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.control-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
  align-items: center;
  margin-bottom: 14px;
}

.status-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-text {
  font-size: 0.85rem;
  color: var(--muted);
}

.refresh-btn {
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: 10px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--blue);
  transition: background .15s ease;
}
.refresh-btn:hover { background: #eef2ff; }
.refresh-btn:disabled { opacity: 0.5; cursor: default; }

.floor-group-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

#floorGroupSelect {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  font-size: 1rem;
  color: var(--text);
  min-width: 140px;
}

.floor-group-hint {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.floor-plan-row {
  display: flex;
  gap: 16px;
  margin-bottom: 22px;
  align-items: stretch;
}

@media (max-width: 640px) {
  .floor-plan-row { flex-direction: column; }
}

.floor-plan-box {
  flex: 2;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}

.floor-plan-img {
  max-width: 100%;
  max-height: 480px;
  object-fit: contain;
  border-radius: 6px;
}

.floor-plan-placeholder {
  color: var(--muted);
  font-size: 0.9rem;
}

.floor-position-box {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  min-width: 160px;
}

.position-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--text);
}

.position-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.position-btn {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text);
  text-align: center;
}

.position-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: white;
}

.main-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 12px;
}

@media (max-width: 640px) {
  .main-cards { grid-template-columns: 1fr; }
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  border: 1px solid var(--border);
}

.card-icon {
  font-size: 2rem;
  line-height: 1;
}

.card-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.card-value {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text);
}

.card-unit {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--muted);
  margin-left: 4px;
}

.device-meta {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 20px;
  padding: 0 4px;
}

.device-meta .dot {
  margin: 0 6px;
}

.error-box {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.9rem;
}

.footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  padding: 16px;
}