:root {
  --bg: #141a26;
  --card: #1d2738;
  --card-2: #232e42;
  --text: #f1f4fa;
  --text-dim: #8a96ab;
  --temp: #46d6a4;
  --humidity: #4ea8f5;
  --abs: #5ad1d1;
  --dew: #7aa6ff;
  --vpd: #e8a23d;
  --danger: #ef5b5b;
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 18px;
}

header h1 {
  font-size: 19px;
  margin: 0;
  flex: 1;
}

select#sensorSelect {
  background: var(--card);
  color: var(--text);
  border: none;
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 14px;
}

.icon-btn {
  background: var(--card);
  border: none;
  color: var(--text);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
}

.live-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.live-cards.secondary {
  grid-template-columns: 1fr 1fr 1fr;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
}

.card.small { padding: 12px 10px; }

.card-label {
  color: var(--text-dim);
  font-size: 12.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-value {
  font-size: 26px;
  font-weight: 700;
}

.card.small .card-value { font-size: 17px; }

.card-value .unit {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  margin-left: 2px;
}

nav.range-tabs, nav.metric-tabs {
  display: flex;
  gap: 6px;
  background: var(--card);
  border-radius: 14px;
  padding: 5px;
  margin-bottom: 12px;
  overflow-x: auto;
}

nav.range-tabs button, nav.metric-tabs button {
  flex: 1;
  white-space: nowrap;
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 9px 10px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
}

nav.range-tabs button.active, nav.metric-tabs button.active {
  background: var(--card-2);
  color: var(--text);
}

.chart-card, .summary-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 16px;
  margin-bottom: 12px;
}

.chart-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: 12px;
}

.chart-stats .stat-label {
  display: block;
  color: var(--text-dim);
  font-size: 11px;
}

.chart-stats > div {
  text-align: center;
  font-size: 15px;
  font-weight: 600;
}

.chart-wrap { position: relative; height: 220px; }

.summary-card h3 {
  margin: 0 0 10px;
  font-size: 15px;
  color: var(--text-dim);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  padding: 6px 0;
  border-bottom: 1px solid var(--card-2);
}

#exportBtn {
  width: 100%;
  margin-top: 12px;
  background: var(--card-2);
  color: var(--text);
  border: none;
  border-radius: 12px;
  padding: 12px;
  font-size: 14px;
  cursor: pointer;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.hidden { display: none; }

.modal-content {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  width: 100%;
  max-width: 380px;
}

.modal-content h3 { margin-top: 0; font-size: 16px; }

fieldset {
  border: 1px solid var(--card-2);
  border-radius: 12px;
  margin-bottom: 12px;
}

fieldset legend { color: var(--text-dim); font-size: 13px; padding: 0 6px; }

fieldset label {
  display: inline-flex;
  flex-direction: column;
  font-size: 12px;
  color: var(--text-dim);
  width: 47%;
  margin: 6px 1%;
}

fieldset input {
  margin-top: 4px;
  background: var(--card-2);
  border: none;
  border-radius: 8px;
  padding: 8px;
  color: var(--text);
  font-size: 14px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
}

.modal-actions button {
  flex: 1;
  padding: 11px;
  border-radius: 10px;
  border: none;
  font-size: 14px;
  cursor: pointer;
}

.modal-actions button[type="submit"] {
  background: var(--temp);
  color: #0b1620;
  font-weight: 600;
}

.modal-actions button[type="button"] {
  background: var(--card-2);
  color: var(--text);
}