#login-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

#login-overlay.hidden { display: none; }

.login-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem 2.25rem;
  width: 340px;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  text-align: center;
}

.login-icon {
  color: var(--fire);
  font-size: 1.6rem;
  line-height: 1;
  align-self: center;
}

.login-box h2 { font-size: 1.3rem; }
.login-box p { color: var(--muted); font-size: 0.88rem; }
.login-box input[type="password"] { width: 100%; }
.login-box button { align-self: stretch; }
.login-foot { margin-top: 0.2rem; font-size: 0.85rem; }

.remember-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.remember-row input[type="checkbox"] {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}

.remember-row input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.remember-row input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

main { max-width: 1140px; margin: 0 auto; padding: 1.75rem 1.5rem 3rem; }

.section { margin-bottom: 2.5rem; }

.section-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
}

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

.sensor-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--muted);
  border-radius: 6px;
  padding: 0.9rem 1rem;
}

.sensor-card.batt-ok   { border-left-color: var(--ok); }
.sensor-card.batt-warn { border-left-color: var(--warn); }
.sensor-card.batt-low  { border-left-color: var(--danger); }

.card-header {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.card-header span {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 400;
  margin-left: 0.4rem;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.22rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.86rem;
}

.metric-row:last-child { border-bottom: none; }
.metric-label { color: var(--muted); }
.metric-value { font-weight: 600; text-align: right; }

.chart-controls {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

.search-group, .preset-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.search-group label, .preset-group > label {
  font-size: 0.78rem;
  color: var(--muted);
}

.preset-btns { display: flex; }

.preset-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-right-width: 0;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 0;
}

.preset-btn:hover { background: var(--surface2); color: var(--text); }
.preset-btn:first-child { border-radius: 5px 0 0 5px; }
.preset-btn:last-child  { border-radius: 0 5px 5px 0; border-right-width: 1px; }

.preset-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (max-width: 720px) {
  .charts-grid { grid-template-columns: 1fr; }
}

.chart-tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem 1rem;
  height: 260px;
  display: flex;
  flex-direction: column;
}

.chart-tile-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.5rem;
  flex-shrink: 0;
}

.chart-tile canvas { flex: 1; min-height: 0; }