/* ═══════════════════════════════════════════════════════════
   Boiler Monitor — Mobile-first CSS
   ═══════════════════════════════════════════════════════════ */

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-card-alt: #222636;
  --text: #e8eaf0;
  --text-dim: #8b90a0;
  --accent: #4f8cff;
  --accent-dim: #3a6bcc;
  --green: #34d399;
  --red: #f87171;
  --orange: #fbbf24;
  --radius: 14px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
  overflow-x: hidden;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

/* ─── Header ─────────────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  padding: 14px 16px 10px;
  gap: 10px;
}
.header h1 {
  font-size: 20px;
  font-weight: 700;
  flex: 0 0 auto;
}
.header-status {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot.online { background: var(--green); box-shadow: 0 0 6px var(--green); }
.dot.offline { background: var(--red); }
.icon-btn {
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; padding: 6px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.icon-btn:active { background: rgba(255,255,255,.08); }

/* ─── Tabs ───────────────────────────────────────────── */
.tabs {
  display: flex;
  padding: 0 16px;
  gap: 4px;
  margin-bottom: 16px;
}
.tab {
  flex: 1;
  background: var(--bg-card);
  border: none;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 0;
  border-radius: 10px;
  cursor: pointer;
  transition: all .2s;
}
.tab.active {
  background: var(--accent);
  color: #fff;
}

/* ─── Tab content ────────────────────────────────────── */
.tab-content { display: none; padding: 0 16px 24px; }
.tab-content.active { display: block; }

/* ─── Temperature cards ──────────────────────────────── */
.temp-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}
/* When 4+ cards, use 2-column layout on narrow screens */
@media (max-width: 400px) {
  .temp-cards { grid-template-columns: repeat(2, 1fr); }
}
.temp-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px 10px;
  text-align: center;
}
.temp-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 500;
}
.temp-value {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.temp-unit {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 2px;
}

/* Temperature color coding */
.temp-cold { color: #60a5fa; }
.temp-ok { color: var(--green); }
.temp-warm { color: var(--orange); }
.temp-hot { color: var(--red); }

/* ─── Setpoints summary card ─────────────────────────── */
.setpoints-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 16px;
  cursor: pointer;
  transition: background .15s;
}
.setpoints-card:active { background: var(--bg-card-alt); }
.setpoints-summary {
  display: flex;
  align-items: center;
  gap: 10px;
}
.sp-summary-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dim);
  flex: 1;
}
.sp-summary-values {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.sp-val-max { color: var(--orange); }

/* ─── Thermostat bottom-sheet ────────────────────────── */
.thermostat-sheet {
  padding: 0 20px calc(20px + var(--safe-bottom));
  text-align: center;
  overflow-x: hidden;
}
.sheet-handle {
  width: 36px; height: 4px;
  background: rgba(255,255,255,.2);
  border-radius: 2px;
  margin: 10px auto 8px;
}
.thermo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0 0;
  font-size: 17px;
  font-weight: 700;
}
.thermo-close {
  background: rgba(255,255,255,.1);
  border: none;
  color: #fff;
  font-size: 28px;
  line-height: 1;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 50%;
  flex-shrink: 0;
}
.thermo-close:active { background: rgba(255,255,255,.2); }
.thermo-current {
  font-size: 16px;
  font-weight: 600;
  color: var(--green);
  margin: 8px 0 4px;
}
.thermo-dial-wrap {
  position: relative;
  width: 85%;
  max-width: 280px;
  margin: 0 auto;
  aspect-ratio: 300/280;
}
#thermo-svg {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}
.thermo-center {
  position: absolute;
  top: 46%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
}
.thermo-center-label {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.thermo-center-value {
  font-size: 48px;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

/* Preset buttons */
.thermo-presets {
  display: flex;
  gap: 8px;
  margin: 12px 0 8px;
}
.thermo-preset {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 6px;
  border: 1.5px solid var(--bg-card-alt);
  border-radius: 12px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all .15s;
}
.thermo-preset.active {
  border-color: var(--orange);
  background: rgba(251,191,36,.08);
  color: var(--text);
}
.thermo-preset:active { transform: scale(0.96); }
.preset-icon { font-size: 20px; line-height: 1; }
.preset-name { font-size: 12px; font-weight: 600; }
.preset-temp { font-size: 16px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--orange); }
.thermo-status {
  font-size: 13px;
  text-align: center;
  min-height: 20px;
  margin: 8px 0;
}
.thermo-status.ok { color: var(--green); }
.thermo-status.err { color: var(--red); }
.thermo-status.loading { color: var(--text-dim); }

.btn-primary {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled {
  background: var(--bg-card-alt);
  color: var(--text-dim);
  cursor: default;
}

/* ─── Boiler card ────────────────────────────────────── */
.boiler-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.boiler-status {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}
.boiler-icon { color: var(--text-dim); }
.boiler-icon.on { color: var(--orange); }
.boiler-state {
  font-size: 15px;
  font-weight: 600;
}
.boiler-update {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}
.btn-relay {
  padding: 10px 18px;
  border: 2px solid var(--accent);
  border-radius: 10px;
  background: transparent;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all .15s;
}
.btn-relay:active { background: var(--accent); color: #fff; }
.btn-relay:disabled { border-color: var(--bg-card-alt); color: var(--text-dim); }
.btn-relay.on {
  border-color: var(--orange);
  color: var(--orange);
}

/* ─── Charts tab ─────────────────────────────────────── */
.chart-period {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}
.period-btn {
  flex: 1;
  padding: 8px;
  border: 1.5px solid var(--bg-card-alt);
  border-radius: 8px;
  background: transparent;
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.period-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(79, 140, 255, .1);
}
.chart-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 14px;
}
.chart-container h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.chart-container canvas {
  width: 100% !important;
  height: 200px !important;
}

/* ─── Runtime tab ────────────────────────────────────── */
.runtime-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 18px 16px;
  margin-bottom: 14px;
}
.runtime-card h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.runtime-bar-wrap {
  height: 10px;
  background: var(--bg-card-alt);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 10px;
}
.runtime-bar {
  height: 100%;
  background: var(--orange);
  border-radius: 5px;
  width: 0%;
  transition: width .6s ease;
}
.runtime-details {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.runtime-sep {
  color: var(--text-dim);
  font-size: 16px;
}
.runtime-details span:last-child {
  font-size: 16px;
  color: var(--text-dim);
}

.custom-range {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.custom-range input[type="date"] {
  flex: 1;
  padding: 8px;
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.range-sep {
  color: var(--text-dim);
  font-size: 14px;
}
.btn-range {
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(96,130,250,.12);
  border: 1px solid rgba(96,130,250,.3);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
}
.btn-range:active {
  background: rgba(96,130,250,.25);
}

.power-info {
  display: flex;
  gap: 20px;
}
.power-item {
  flex: 1;
}
.power-label {
  font-size: 12px;
  color: var(--text-dim);
  display: block;
  margin-bottom: 4px;
}
.power-value {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ─── Modal ──────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  transition: opacity .2s;
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--bg-card);
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 85dvh;
  overflow-y: auto;
  padding-bottom: calc(20px + var(--safe-bottom));
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 12px;
}
.modal-header h2 { font-size: 18px; font-weight: 700; }
.modal-header .icon-btn { font-size: 24px; }
.modal-body {
  padding: 0 20px 20px;
}
.modal-body label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 14px;
  font-weight: 500;
}
.modal-body input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 12px;
  border: 1.5px solid var(--bg-card-alt);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .15s;
}
.modal-body input:focus { border-color: var(--accent); }
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
}
.btn-secondary {
  flex: 1;
  padding: 12px;
  border: 1.5px solid var(--accent-dim);
  border-radius: 10px;
  background: transparent;
  color: var(--accent);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.modal-actions .btn-primary { flex: 1; }
.settings-msg {
  margin-top: 12px;
  font-size: 13px;
  text-align: center;
  min-height: 20px;
}
.settings-msg.ok { color: var(--green); }
.settings-msg.err { color: var(--red); }

/* ─── Alert banner ───────────────────────────────────── */
.alert-banner {
  margin: 0 16px 12px;
  padding: 12px 14px;
  background: rgba(248, 113, 113, .15);
  border: 1.5px solid var(--red);
  border-radius: 10px;
  color: var(--red);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
}
.alert-banner.hidden { display: none; }

.alert-btn {
  position: relative;
}
.alert-btn.hidden { display: none; }
.alert-badge {
  position: absolute;
  top: 0; right: 0;
  background: var(--red);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  min-width: 16px; height: 16px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 4px;
}

/* ─── Alert card in temp-card ────────────────────────── */
.temp-card.alert {
  border: 1.5px solid var(--red);
  animation: alertPulse 2s infinite;
}
@keyframes alertPulse {
  0%, 100% { border-color: var(--red); }
  50% { border-color: transparent; }
}

/* ─── Alerts list in modal ───────────────────────────── */
.alert-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--bg-card-alt);
  font-size: 13px;
}
.alert-item:last-child { border-bottom: none; }
.alert-item .alert-time {
  color: var(--text-dim);
  font-size: 11px;
  margin-bottom: 4px;
}
.alert-item .alert-msg { color: var(--red); }
.alert-item.acked .alert-msg { color: var(--text-dim); }

/* ─── Settings sections ──────────────────────────────── */
.settings-section {
  font-size: 15px;
  font-weight: 700;
  margin: 20px 0 12px;
  padding-top: 16px;
  border-top: 1px solid var(--bg-card-alt);
  color: var(--text);
}
.settings-section:first-child { border-top: none; margin-top: 0; padding-top: 0; }

/* ─── Sensor config row ──────────────────────────────── */
.sensor-row {
  background: var(--bg);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 10px;
}
.sensor-row-header {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}
.sensor-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.sensor-fields label {
  margin-bottom: 0;
}
.sensor-fields input {
  margin-top: 4px;
  padding: 8px;
  font-size: 14px;
}
.sensor-fields .full-width {
  grid-column: 1 / -1;
}
.sensor-control-tag {
  display: inline-block;
  background: rgba(251,191,36,.15);
  color: var(--orange);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: 8px;
}

/* ─── Sensor calibration ─────────────────────────────── */
.sensor-calibration {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,.06);
}
.cal-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.cal-current {
  font-size: 13px;
  color: var(--text-dim);
}
.cal-current strong {
  color: var(--text);
}
.cal-offset {
  font-size: 12px;
  color: var(--text-dim);
  opacity: .7;
}
.cal-ref-label {
  flex: 1;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 0;
}
.cal-ref-label input {
  margin-top: 4px;
  padding: 8px;
  font-size: 14px;
  width: 100%;
}
.btn-calibrate {
  align-self: flex-end;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--orange);
  background: rgba(251,191,36,.1);
  border: 1px solid rgba(251,191,36,.3);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s;
}
.btn-calibrate:active {
  background: rgba(251,191,36,.2);
}

/* ─── Animations ─────────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}
.loading { animation: pulse 1.5s infinite; }

/* ─── Prevent overscroll bounce ──────────────────────── */
html { overscroll-behavior: none; }

/* ─── Login screen ──────────────────────────────────── */
.login-screen {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 20px;
  background: var(--bg);
}
.login-card {
  width: 100%; max-width: 340px;
  background: var(--bg-card); border-radius: 16px;
  padding: 32px 24px; text-align: center;
}
.login-logo { margin-bottom: 12px; }
.login-card h2 { color: var(--text); font-size: 22px; margin-bottom: 24px; }
.login-card form { display: flex; flex-direction: column; gap: 12px; }
.login-card input {
  padding: 12px; border-radius: 10px;
  border: 1px solid var(--bg-card-alt);
  background: var(--bg); color: var(--text);
  font-size: 15px; outline: none;
}
.login-card input:focus { border-color: var(--orange); }
.remember-me {
  display: flex; align-items: center; gap: 8px;
  color: var(--text-dim); font-size: 14px; cursor: pointer;
  flex-direction: row !important;
}
.remember-me input { width: 18px; height: 18px; accent-color: var(--orange); cursor: pointer; }
.login-btn {
  padding: 14px !important; font-size: 16px !important;
  border-radius: 12px !important; margin-top: 4px;
}
.login-error {
  color: var(--red); margin-top: 12px; font-size: 14px;
}
.hidden { display: none !important; }

/* ─── User management ──────────────────────────────── */
.user-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 0; border-bottom: 1px solid var(--bg-card-alt);
}
.user-info { flex: 1; }
.user-info strong { display: block; color: var(--text); font-size: 14px; }
.user-login { color: var(--text-dim); font-size: 12px; min-width: 60px; }
.user-role-tag {
  display: inline-block; font-size: 11px; padding: 2px 8px;
  border-radius: 6px; margin-top: 2px;
}
.user-role-tag.admin { background: rgba(251,191,36,.15); color: var(--orange); }
.user-role-tag.user { background: rgba(96,165,250,.15); color: #60a5fa; }
.btn-delete-user {
  background: transparent; border: none; color: var(--red);
  font-size: 18px; cursor: pointer; padding: 4px 8px;
  border-radius: 6px;
}
.btn-delete-user:hover { background: rgba(239,68,68,.15); }
.add-user-form {
  margin-top: 16px; display: flex; flex-direction: column; gap: 8px;
}
.add-user-form h4 { color: var(--text); font-size: 14px; margin: 8px 0 4px; }
.add-user-form input, .add-user-form select {
  padding: 10px; border-radius: 8px;
  border: 1px solid var(--bg-card-alt);
  background: var(--bg); color: var(--text);
  font-size: 14px;
}
.add-user-form select { appearance: auto; }