/* ============================================================
   Smart LTLH Dashboard — Premium Dark Theme
   ============================================================ */

:root {
  /* Color Palette */
  --bg-primary:    #0a0e1a;
  --bg-secondary:  #111827;
  --bg-card:       rgba(17, 24, 39, 0.7);
  --bg-glass:      rgba(255, 255, 255, 0.04);
  --border-glass:  rgba(255, 255, 255, 0.08);
  --border-hover:  rgba(255, 255, 255, 0.15);

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;

  --accent-blue:    #3b82f6;
  --accent-cyan:    #06b6d4;
  --accent-purple:  #8b5cf6;
  --accent-pink:    #ec4899;
  --accent-green:   #10b981;
  --accent-orange:  #f59e0b;
  --accent-red:     #ef4444;

  --grad-temp:      linear-gradient(135deg, #ef4444, #f97316);
  --grad-hum:       linear-gradient(135deg, #06b6d4, #3b82f6);
  --grad-power:     linear-gradient(135deg, #f59e0b, #eab308);
  --grad-energy:    linear-gradient(135deg, #10b981, #059669);

  --shadow-card:    0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow:    0 0 30px rgba(59, 130, 246, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  font-size: 14px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
}

/* ============================================================
   Header
   ============================================================ */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(17, 24, 39, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: var(--radius-md);
  color: white;
}
.logo-icon svg { width: 22px; height: 22px; }

header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #f1f5f9, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.connection-badge, .uptime-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
}

.connection-badge.online {
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
}
.connection-badge.offline {
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--accent-red);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}
.connection-badge.online .pulse-dot {
  background: var(--accent-green);
  animation: pulse 2s ease-in-out infinite;
}
.connection-badge.offline .pulse-dot {
  background: var(--accent-red);
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
}

.uptime-badge {
  color: var(--text-secondary);
}

/* ============================================================
   Main Layout
   ============================================================ */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ============================================================
   Sensor Cards Grid
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.sensor-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.sensor-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0.8;
}

#cardTemp::before  { background: var(--grad-temp); }
#cardHum::before   { background: var(--grad-hum); }
#cardPower::before { background: var(--grad-power); }
#cardEnergy::before{ background: var(--grad-energy); }

.sensor-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.card-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: white;
}
.card-icon svg { width: 18px; height: 18px; }

.temp-icon   { background: var(--grad-temp); }
.hum-icon    { background: var(--grad-hum); }
.power-icon  { background: var(--grad-power); }
.energy-icon { background: var(--grad-energy); }

.card-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.card-value {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 12px;
}

.value-number {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  transition: color 0.3s;
}

#cardTemp .value-number  { color: #f97316; }
#cardHum .value-number   { color: #3b82f6; }
#cardPower .value-number { color: #f59e0b; }
#cardEnergy .value-number{ color: #10b981; }

.value-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.card-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 2px;
  margin-bottom: 12px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.temp-bar { background: var(--grad-temp); }
.hum-bar  { background: var(--grad-hum); }

.card-footer {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.card-footer strong { color: var(--text-secondary); }

.card-sub-values {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}
.sub-val {
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.sub-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 2px;
}

/* ============================================================
   Glass Panels (Device Status, Control, Setpoints)
   ============================================================ */
.panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color 0.3s;
}

.glass-panel:hover {
  border-color: var(--border-hover);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-glass);
}
.panel-title svg { color: var(--accent-blue); flex-shrink: 0; }

/* Device Status */
.device-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.device-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid transparent;
  transition: all 0.3s;
}

.device-item.active {
  border-color: rgba(16, 185, 129, 0.2);
  background: rgba(16, 185, 129, 0.05);
}

.device-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: all 0.3s;
}

.device-indicator.on {
  background: var(--accent-green);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
}

.device-info {
  flex: 1;
}

.device-name {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
}

.device-state {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.device-item.active .device-state {
  color: var(--accent-green);
}

.pid-bar-container {
  width: 60px;
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  position: relative;
  overflow: hidden;
}

.pid-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-red));
  border-radius: 3px;
  transition: width 0.5s;
}

.pid-label {
  position: absolute;
  right: -30px;
  top: -5px;
  font-size: 0.65rem;
  color: var(--text-muted);
  width: 28px;
}

/* ============================================================
   Mode Toggle
   ============================================================ */
.mode-toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
  padding: 12px;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.mode-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.3s;
  min-width: 55px;
  text-align: center;
}
.mode-label.active { color: var(--accent-blue); }

.mode-switch {
  position: relative;
  width: 52px;
  height: 28px;
  cursor: pointer;
}

.mode-switch input { opacity: 0; width: 0; height: 0; }

.mode-slider {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
  border-radius: 14px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mode-slider::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.mode-switch input:checked + .mode-slider {
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-red));
}

.mode-switch input:checked + .mode-slider::before {
  transform: translateX(24px);
}

/* ============================================================
   Control Toggles
   ============================================================ */
.control-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  opacity: 0.4;
  pointer-events: none;
  transition: all 0.3s;
}

.control-grid.enabled {
  opacity: 1;
  pointer-events: auto;
}

.control-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  cursor: pointer;
  flex-shrink: 0;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  transition: all 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  bottom: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent-green);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
  background: white;
}

/* ============================================================
   Setpoints
   ============================================================ */
.setpoint-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.setpoint-item label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 6px;
}

.setpoint-input-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.setpoint-input-group input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  outline: none;
}

.setpoint-input-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-blue);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(59, 130, 246, 0.4);
  transition: transform 0.2s;
}

.setpoint-input-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.setpoint-input-group input[type="number"] {
  width: 60px;
  padding: 6px 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.85rem;
  text-align: center;
  outline: none;
  transition: border-color 0.3s;
}

.setpoint-input-group input[type="number"]:focus {
  border-color: var(--accent-blue);
}

.btn-save {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  margin-top: 4px;
}

.btn-save:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-save:active {
  transform: translateY(0);
}

.btn-save.saved {
  background: linear-gradient(135deg, var(--accent-green), #059669);
}

/* ============================================================
   Chart Panel
   ============================================================ */
.chart-panel .panel-title {
  flex-wrap: wrap;
}

.chart-controls {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.chart-btn {
  padding: 4px 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.3s;
}

.chart-btn:hover, .chart-btn.active {
  background: var(--accent-blue);
  color: white;
  border-color: var(--accent-blue);
}

.chart-container {
  position: relative;
  height: 300px;
}

/* ============================================================
   Log Table
   ============================================================ */
.btn-export {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  padding: 6px 14px;
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  white-space: nowrap;
}

.btn-export:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.35);
}

.btn-export:active {
  transform: translateY(0);
}

.btn-export.saved {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
}
.table-wrapper {
  overflow-x: auto;
  max-height: 300px;
  overflow-y: auto;
}

.table-wrapper::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.table-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.table-wrapper::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

thead {
  position: sticky;
  top: 0;
  z-index: 1;
}

th {
  padding: 10px 12px;
  text-align: left;
  color: var(--text-muted);
  font-weight: 600;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-glass);
  white-space: nowrap;
}

td {
  padding: 8px 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  white-space: nowrap;
}

tr:hover td {
  background: var(--bg-glass);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 30px !important;
}

/* ============================================================
   Sensor Error Overlay
   ============================================================ */
.error-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.error-overlay.visible {
  display: flex;
}

.error-content {
  text-align: center;
  color: var(--accent-red);
}
.error-content h2 { margin: 16px 0 8px; font-size: 1.4rem; }
.error-content p { color: var(--text-secondary); max-width: 400px; }

/* ============================================================
   Footer
   ============================================================ */
footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .panel-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  html { font-size: 13px; }
  .card-grid { grid-template-columns: 1fr; }
  header { flex-direction: column; gap: 10px; }
  .header-right { flex-wrap: wrap; justify-content: center; }
  main { padding: 12px; gap: 12px; }
  .value-number { font-size: 1.8rem; }
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.sensor-card, .glass-panel {
  animation: fadeInUp 0.5s ease-out both;
}

.sensor-card:nth-child(1) { animation-delay: 0.05s; }
.sensor-card:nth-child(2) { animation-delay: 0.1s; }
.sensor-card:nth-child(3) { animation-delay: 0.15s; }
.sensor-card:nth-child(4) { animation-delay: 0.2s; }

.panel-grid .glass-panel:nth-child(1) { animation-delay: 0.25s; }
.panel-grid .glass-panel:nth-child(2) { animation-delay: 0.3s; }
.panel-grid .glass-panel:nth-child(3) { animation-delay: 0.35s; }

.chart-panel { animation-delay: 0.4s; }
.log-panel   { animation-delay: 0.45s; }

/* Number transition */
.value-changing {
  animation: numberPop 0.3s ease;
}

@keyframes numberPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}