:root {
  --bg: #0c1120;
  --bg-sidebar: #090d18;
  --bg-panel: #141b2d;
  --bg-panel-alt: #171f33;
  --bg-input: #1c2438;
  --border: #232c42;
  --border-soft: #1c2438;
  --text: #e8ecf4;
  --text-dim: #8891a7;
  --text-faint: #5c6680;

  --accent-blue: #4f9eff;
  --accent-green: #22c55e;
  --accent-red: #f0625b;
  --accent-yellow: #f5b93f;
  --accent-purple: #a78bfa;
  --accent-cyan: #22d3ee;
  --accent-orange: #f2994a;

  --radius: 12px;
  --radius-sm: 8px;
  --sidebar-w: 72px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
ul { list-style: none; margin: 0; padding: 0; }

/* ===================== Layout ===================== */

.app-shell {
  display: flex;
  min-height: 100vh;
}

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-content {
  flex: 1;
  padding: 20px 24px 32px;
}

/* ===================== Sidebar ===================== */

.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  transition: width .2s ease;
  flex-shrink: 0;
}

.sidebar.collapsed {
  width: 0;
  padding: 16px 0;
  overflow: hidden;
  border-right: none;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  align-items: center;
}

.nav-item {
  position: relative;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  flex-shrink: 0;
}

.nav-item:hover {
  background: var(--bg-panel);
  color: var(--text);
}

.nav-item.active {
  background: var(--accent-blue);
  color: #fff;
}

.nav-label { display: none; }

.nav-item[data-tooltip]:not([data-tooltip=""])::after,
.sidebar-collapse-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: #1f2942;
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s ease;
  z-index: 50;
  box-shadow: 0 4px 12px rgba(0,0,0,.4);
}

.nav-item[data-tooltip]:not([data-tooltip=""]):hover::after {
  opacity: 1;
}

.sidebar-collapse-btn {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-collapse-btn:hover {
  background: var(--bg-panel);
  color: var(--text);
}

.collapse-icon svg { transition: transform .2s ease; }
.sidebar.collapsed ~ .app-main .sidebar-collapse-btn .collapse-icon svg,
.sidebar-collapse-btn.is-collapsed .collapse-icon svg {
  transform: rotate(180deg);
}

/* ===================== Topbar ===================== */

.topbar {
  height: 64px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border-soft);
  gap: 16px;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 110px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, #1c2438, #232c42);
}

.topbar-center {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.topbar-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  white-space: nowrap;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
}

.status-badge.status-offline .status-dot { background: var(--accent-red); }
.status-badge.status-offline .status-text { color: var(--accent-red); }

.icon-btn {
  position: relative;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover { background: var(--bg-panel); color: var(--text); }
.icon-btn.small { width: 34px; height: 34px; background: var(--bg-input); }
.icon-btn.small:hover { background: var(--border); }
.icon-btn.spinning svg { animation: spin .6s linear; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.icon-dot {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-red);
  border: 2px solid var(--bg);
}

.icon-btn-wrap { position: relative; }

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--bg-panel-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 28px rgba(0,0,0,.45);
  padding: 6px;
  display: none;
  z-index: 60;
}

.dropdown.open { display: block; }

.dropdown-header {
  font-size: 12px;
  color: var(--text-faint);
  padding: 8px 10px 4px;
}

.dropdown-empty {
  padding: 14px 10px;
  color: var(--text-faint);
  font-size: 13px;
  text-align: center;
}

.dropdown-item {
  padding: 9px 10px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text);
}

.dropdown-item:hover { background: var(--bg-input); }

.topbar-clock {
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--text-dim);
  min-width: 46px;
  text-align: right;
}

/* ===================== Metric cards ===================== */

.metrics-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.metric-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 16px;
  transition: box-shadow .15s ease, border-color .15s ease;
}

.metric-card.editing {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 1px var(--accent-blue) inset;
}

.metric-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.metric-card-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 13px;
}

.metric-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-red { color: var(--accent-red); background: rgba(240,98,91,.12); }
.icon-blue { color: var(--accent-blue); background: rgba(79,158,255,.12); }
.icon-green { color: var(--accent-green); background: rgba(34,197,94,.12); }
.icon-yellow { color: var(--accent-yellow); background: rgba(245,185,63,.12); }
.icon-purple { color: var(--accent-purple); background: rgba(167,139,250,.12); }
.icon-cyan { color: var(--accent-cyan); background: rgba(34,211,238,.12); }

.edit-btn {
  width: 26px;
  height: 26px;
  border: none;
  background: transparent;
  color: var(--text-faint);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.edit-btn:hover { background: var(--bg-input); color: var(--text); }
.metric-card.editing .edit-btn { color: var(--accent-green); }

.metric-value-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 10px;
}

.metric-value {
  font-size: 28px;
  font-weight: 600;
  outline: none;
  border-radius: 4px;
}

.metric-value[contenteditable="true"],
.metric-target-value[contenteditable="true"] {
  background: var(--bg-input);
  padding: 0 4px;
  box-shadow: 0 0 0 1px var(--accent-blue);
}

.metric-unit {
  font-size: 13px;
  color: var(--text-dim);
}

.metric-target {
  width: 100%;
  background: transparent;
  border: none;
  border-top: 1px solid var(--border-soft);
  padding-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 12.5px;
}

.metric-target:hover { color: var(--text-dim); }
.metric-target .chevron { display: flex; opacity: .6; }
.metric-target-value { outline: none; border-radius: 4px; }

/* ===================== Panels ===================== */

.middle-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  margin-bottom: 16px;
  align-items: start;
}

.bottom-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr 0.9fr;
  gap: 16px;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 18px;
}

.panel-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 14px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.panel-head .panel-title { margin: 0; }

/* ===================== Chart ===================== */

.chart-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.range-select {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 13px;
  outline: none;
}

.chart-body { position: relative; }

.chart-svg {
  width: 100%;
  height: 300px;
  display: block;
}

.chart-grid line {
  stroke: var(--border-soft);
  stroke-width: 1;
}

.line-temp { stroke: var(--accent-red); }
.line-hum { stroke: var(--accent-blue); }
.line-co2 { stroke: var(--accent-green); }
.line-light { stroke: var(--accent-yellow); }
.line-soil { stroke: var(--accent-purple); }
.line-water { stroke: var(--accent-cyan); }

.chart-x-axis {
  display: flex;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 12px;
  margin-top: 6px;
  padding: 0 4px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-dim);
}

.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.dot-temp { background: var(--accent-red); }
.dot-hum { background: var(--accent-blue); }
.dot-co2 { background: var(--accent-green); }
.dot-light { background: var(--accent-yellow); }
.dot-soil { background: var(--accent-purple); }
.dot-water { background: var(--accent-cyan); }

.chart-panel.fullscreen {
  position: fixed;
  inset: 16px;
  z-index: 200;
  overflow: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
}

.chart-panel.fullscreen .chart-svg { height: 60vh; }

/* ===================== Devices ===================== */

.device-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 18px;
}

.device-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 4px;
}

.device-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text);
}

.device-icon {
  color: var(--text-dim);
  display: flex;
}

.toggle-switch {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: #2a3350;
  border: none;
  position: relative;
  flex-shrink: 0;
  transition: background .15s ease;
}

.toggle-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ccd3e3;
  transition: transform .15s ease, background .15s ease;
}

.toggle-switch.on { background: var(--accent-green); }
.toggle-switch.on .toggle-knob { transform: translateX(18px); background: #fff; }

.quick-actions-title { margin-top: 4px; }

.quick-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quick-action-btn {
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: 13.5px;
  font-weight: 500;
  text-align: left;
  border: 1px solid;
  transition: background .15s ease, transform .05s ease;
}

.quick-action-btn:active { transform: scale(.98); }

.qa-green { color: var(--accent-green); border-color: rgba(34,197,94,.4); }
.qa-green:hover { background: rgba(34,197,94,.1); }
.qa-blue { color: var(--accent-blue); border-color: rgba(79,158,255,.4); }
.qa-blue:hover { background: rgba(79,158,255,.1); }
.qa-yellow { color: var(--accent-yellow); border-color: rgba(245,185,63,.4); }
.qa-yellow:hover { background: rgba(245,185,63,.1); }
.qa-red { color: var(--accent-red); border-color: rgba(240,98,91,.4); }
.qa-red:hover { background: rgba(240,98,91,.1); }

.quick-action-btn.pressed { background: currentColor; }
.quick-action-btn.pressed { color: #0c1120 !important; }

/* ===================== Events table ===================== */

.events-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.events-table th {
  text-align: left;
  color: var(--text-faint);
  font-weight: 500;
  padding: 8px 6px;
  border-bottom: 1px solid var(--border-soft);
}

.events-table td {
  padding: 10px 6px;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-dim);
}

.events-table tr:last-child td { border-bottom: none; }
.cell-red { color: var(--accent-red); }

/* ===================== Overview / weather ===================== */

.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px 12px;
}

.overview-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.overview-label {
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.3;
}

.overview-value {
  font-size: 20px;
  font-weight: 600;
}

.overview-value small { font-size: 12px; font-weight: 400; color: var(--text-dim); }

.color-red { color: var(--accent-red); }
.color-blue { color: var(--accent-blue); }
.color-green { color: var(--accent-green); }
.color-orange { color: var(--accent-orange); }

.weather-main {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-soft);
}

.weather-cloud-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
}

.weather-temp-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.weather-label { font-size: 12.5px; color: var(--text-faint); }
.weather-temp { font-size: 26px; font-weight: 600; }
.weather-temp small { font-size: 14px; font-weight: 400; color: var(--text-dim); }

.weather-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

.weather-value { font-size: 15px; font-weight: 600; }
.weather-value small { font-size: 11px; font-weight: 400; color: var(--text-dim); }
.weather-stat { display: flex; flex-direction: column; gap: 6px; }

/* ===================== Footer ===================== */

.app-footer {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-top: 1px solid var(--border-soft);
  font-size: 12.5px;
  color: var(--text-faint);
}

.footer-right { display: flex; align-items: center; gap: 10px; }
.footer-dot { opacity: .5; }
.footer-link:hover { color: var(--text); }

/* ===================== Empty pages ===================== */

.empty-page {
  height: calc(100vh - 64px - 100px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-faint);
  gap: 10px;
}

.empty-page-icon { color: var(--text-faint); margin-bottom: 6px; }
.empty-page-title { font-size: 18px; color: var(--text); margin: 0; }
.empty-page-text { margin: 0; font-size: 13.5px; max-width: 340px; }

/* ===================== Responsive ===================== */

@media (max-width: 1400px) {
  .metrics-row { grid-template-columns: repeat(3, 1fr); }
  .middle-row { grid-template-columns: 1fr; }
  .bottom-row { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .metrics-row { grid-template-columns: repeat(2, 1fr); }
  .bottom-row { grid-template-columns: 1fr; }
  .topbar-title { font-size: 17px; }
  .brand-logo { display: none; }
}