/* ============================================
   SMART ENERGY MONITOR - PRO UI/UX SYSTEM
   High-end, clean, data-dense interface.
   No gradients, no glows, sharp borders.
   ============================================ */

:root {
  /* Strictly Monochrome Base */
  --bg-primary: #050505;
  --bg-card: #0A0A0A;
  --bg-surface: #121212;
  --bg-hover: #1A1A1A;
  
  /* Solid Professional Accents (Emerald Tone) */
  --accent-primary: #10b981;
  --accent-hover: #059669;
  
  /* Semantic Status Colors */
  --color-normal: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  /* Typography Colors */
  --text-primary: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-muted: #52525B;

  /* Architectural Elements */
  --border-light: #1A1A1A;
  --border-medium: #27272A;
  --border-focus: #3F3F46;

  /* Geometry & Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap-md: 16px;
  --gap-lg: 24px;
  --gap-xl: 32px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-full: 9999px;

  /* System Fonts */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
}

:root[data-theme="light"] {
  --bg-primary: #f4f4f5;
  --bg-card: #ffffff;
  --bg-surface: #f4f4f5;
  --bg-hover: #e4e4e7;
  
  --border-light: #e4e4e7;
  --border-medium: #d4d4d8;
  --border-focus: #a1a1aa;

  --text-primary: #09090b;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
}

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

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  margin: 0;
}

/* --- Utilities --- */
.hidden { display: none !important; }

/* --- Loading Screen --- */
.loading-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 10000;
  transition: opacity 0.5s ease;
}

.loading-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-content {
  text-align: center;
}

.loading-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-bottom: var(--gap-lg);
}

.loading-bar {
  width: 240px;
  height: 2px;
  background: var(--bg-surface);
  margin: 0 auto var(--gap-md);
  overflow: hidden;
}

.loading-bar-fill {
  width: 0%;
  height: 100%;
  background: var(--accent-primary);
  animation: load 2s ease forwards;
}

@keyframes load {
  0% { width: 0%; }
  50% { width: 60%; }
  100% { width: 100%; }
}

.loading-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Header --- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gap-xl);
  height: 64px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.logo {
  display: flex;
  align-items: center;
  color: var(--text-primary);
}

.header-text h1 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.header-subtitle {
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
}

/* System Status Pill */
.system-status {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
}

@keyframes blink-live {
  0% { opacity: 1; box-shadow: 0 0 4px var(--color-normal); }
  50% { opacity: 0.2; box-shadow: 0 0 0 var(--color-normal); }
  100% { opacity: 1; box-shadow: 0 0 4px var(--color-normal); }
}

@keyframes blink-fault {
  0% { opacity: 1; box-shadow: 0 0 8px var(--color-danger); }
  50% { opacity: 0.1; box-shadow: 0 0 0 var(--color-danger); }
  100% { opacity: 1; box-shadow: 0 0 8px var(--color-danger); }
}

.status-normal .status-dot { 
  background: var(--color-normal); 
  animation: blink-live 2s infinite ease-in-out;
}
.status-warning .status-dot { 
  background: var(--color-warning); 
}
.status-fault .status-dot { 
  background: var(--color-danger); 
  animation: blink-fault 0.5s infinite ease-in-out;
}

/* Header Meta */
.header-meta {
  display: flex;
  gap: var(--gap-lg);
}

.meta-item {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.meta-label {
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-value {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.connection-btn, .theme-toggle-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.connection-btn:hover, .theme-toggle-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-focus);
}

.connection-btn.connected { color: var(--color-normal); }
.connection-btn.disconnected { color: var(--color-danger); }

/* --- Main Dashboard --- */
.dashboard {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--gap-xl);
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

.section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--gap-md);
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
}

/* Sensor Grid */
.sensor-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--gap-md);
}

.sensor-card {
  padding: var(--gap-lg);
  display: flex;
  flex-direction: column;
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-md);
}

.card-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.card-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-value {
  display: flex;
  align-items: baseline;
  gap: var(--gap-xs);
  margin-bottom: var(--gap-md);
}

.value-number {
  font-size: 2rem;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.value-unit {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-sparkline {
  height: 40px;
  margin-bottom: var(--gap-sm);
}

.card-footer {
  display: flex;
  justify-content: flex-end;
}

.card-trend {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-trend.up { color: var(--color-normal); }
.card-trend.down { color: var(--color-danger); }
.card-trend.neutral { color: var(--text-muted); }

/* --- Analytics & Controls Layout --- */
.charts-controls-row {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--gap-md);
}

.charts-panel, .controls-panel {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

/* --- Chart Card --- */
.chart-card {
  padding: var(--gap-lg);
  flex: 1;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--gap-lg);
}

.chart-tabs {
  display: flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 2px;
}

.chart-tab {
  padding: 4px 12px;
  background: transparent;
  border: none;
  font-size: 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.chart-tab:hover {
  color: var(--text-primary);
}

.chart-tab.active {
  background: var(--border-focus);
  color: var(--text-primary);
  font-weight: 500;
}

.chart-container {
  height: 320px;
}

/* --- Control Panels --- */
.relay-card, .energy-card, .alerts-card, .limits-card {
  padding: var(--gap-lg);
}

.card-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: var(--gap-lg);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: var(--gap-sm);
}

/* Relay Status */
.relay-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-md);
}

.relay-ring {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border-medium);
  background: var(--bg-surface);
  transition: border-color 0.2s;
}

.relay-ring.on {
  border-color: var(--color-normal);
  color: var(--color-normal);
}

.relay-ring.off {
  border-color: var(--border-focus);
  color: var(--text-secondary);
}

.relay-status-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.toggle-switch {
  position: relative;
  display: block;
  margin: var(--gap-lg) auto var(--gap-md);
  width: 60px;
  height: 32px;
  cursor: pointer;
}

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

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-surface);
  border: 2px solid var(--text-muted); /* Make border more visible when off */
  border-radius: var(--radius-full);
  transition: 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 24px;
  width: 24px;
  left: 2px;
  bottom: 2px;
  background: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Hover state for better UX */
.toggle-switch:hover .toggle-slider {
  border-color: var(--text-secondary);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--color-normal);
  border-color: var(--color-normal);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.3);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(28px);
  background: #ffffff;
}

.relay-note {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

/* Energy Forms */
.energy-input-group label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: var(--gap-xs);
}

.input-row {
  display: flex;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-lg);
}

.input-row input {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-family: var(--font-mono);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.85rem;
}

.input-row input:focus {
  border-color: var(--accent-primary);
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  padding: 0 16px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: 0.2s;
}

.btn-primary:hover {
  opacity: 0.9;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--gap-sm);
  font-size: 0.8rem;
}

.stat-label { color: var(--text-secondary); }
.stat-value { font-family: var(--font-mono); color: var(--text-primary); }

.energy-progress-container {
  margin-top: var(--gap-md);
}

.progress-bar {
  height: 6px;
  background: var(--bg-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--gap-xs);
}

.progress-fill {
  height: 100%;
  background: var(--accent-primary); /* Solid color, no gradient */
  transition: width 0.3s ease;
}

.energy-percent {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  text-align: right;
  display: block;
}

/* Alerts List */
.alerts-card {
  max-height: 400px;
  display: flex;
  flex-direction: column;
}

.alerts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--gap-md);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: var(--gap-sm);
}

.alerts-header .card-title {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
}

.btn-text:hover { color: var(--text-primary); }

.alerts-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  overflow-y: auto;
  flex: 1;
}

.alert-item {
  display: flex;
  align-items: flex-start;
  gap: var(--gap-sm);
  padding: var(--gap-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
}

.alert-icon { font-size: 0.9rem; }
.alert-content { flex: 1; }
.alert-message { font-size: 0.8rem; color: var(--text-primary); margin-bottom: 4px; }
.alert-time { font-size: 0.7rem; color: var(--text-muted); font-family: var(--font-mono); }
.alert-type-badge {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  text-transform: uppercase;
}

.alert-empty {
  text-align: center;
  color: var(--text-muted);
  padding: var(--gap-xl) 0;
  font-size: 0.8rem;
}

/* Flash Overlay */
.alert-flash {
  position: fixed;
  inset: 0;
  background: rgba(239, 68, 68, 0.2);
  pointer-events: none;
  z-index: 9999;
}

/* Toast */
.toast {
  position: fixed;
  bottom: var(--gap-lg);
  right: var(--gap-lg);
  padding: 12px 20px;
  background: var(--text-primary);
  color: var(--bg-primary);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  z-index: 1000;
  animation: toast-in 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes toast-in {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Footer */
.app-footer {
  text-align: center;
  padding: var(--gap-lg) 0 0 0;
  margin-top: var(--gap-md);
  border-top: 1px solid var(--border-light);
}

.app-footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.app-footer a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: opacity 0.2s;
}

.app-footer a:hover {
  opacity: 0.8;
}

/* --- Value Update Flash --- */
.value-updated {
  animation: value-flash 0.4s ease-out;
}

@keyframes value-flash {
  0% { color: var(--accent-primary); }
  100% { color: var(--text-primary); }
}

/* --- Reconnecting Pulse on Connection Button --- */
.connection-btn.reconnecting {
  color: var(--color-warning);
  animation: reconnect-pulse 1.2s infinite ease-in-out;
  border-color: var(--color-warning);
}

@keyframes reconnect-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4); }
  50% { opacity: 0.6; box-shadow: 0 0 8px 2px rgba(245, 158, 11, 0.3); }
}

/* --- Stale Data Indicator on Sensor Cards --- */
.sensor-card.stale {
  border-color: rgba(245, 158, 11, 0.3);
  animation: stale-glow 2s infinite ease-in-out;
}

@keyframes stale-glow {
  0%, 100% { border-color: rgba(245, 158, 11, 0.3); }
  50% { border-color: rgba(245, 158, 11, 0.1); }
}

.sensor-card.stale .card-label::after {
  content: ' • STALE';
  color: var(--color-warning);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
}

/* --- Relay Loading Spinner --- */
.relay-ring.loading {
  position: relative;
}

.relay-ring.loading::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  border-top-color: var(--accent-primary);
  animation: relay-spin 0.8s linear infinite;
}

@keyframes relay-spin {
  to { transform: rotate(360deg); }
}

/* --- Energy Stats Grid --- */
.energy-stats {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-md);
}

.energy-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.energy-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.energy-value {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.energy-value.accent {
  color: var(--accent-primary);
  font-weight: 600;
}

/* --- Energy Progress Bar --- */
.energy-progress-wrapper {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.energy-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.energy-progress-fill {
  height: 100%;
  background: var(--accent-primary);
  transition: width 0.3s ease;
  border-radius: var(--radius-full);
}

/* --- Ghost Button (Clear Alerts) --- */
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--bg-hover);
}

/* --- Toast Out Animation --- */
@keyframes toast-out {
  from { transform: translateY(0); opacity: 1; }
  to { transform: translateY(20px); opacity: 0; }
}

/* --- Card Glow (hidden by default) --- */
.card-glow {
  display: none;
}

/* Responsive */
@media (max-width: 1200px) {
  .sensor-cards { grid-template-columns: repeat(3, 1fr); }
  .charts-controls-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .dashboard { padding: var(--gap-md); }
  .sensor-cards { grid-template-columns: 1fr 1fr; }
  .app-header { padding: 0 var(--gap-md); }
  .header-meta { display: none; }
  .status-text { display: none; }
  .header-text h1 { font-size: 0.9rem; }
}

@media (max-width: 480px) {
  .dashboard { padding: var(--gap-sm); }
  .sensor-cards { grid-template-columns: 1fr; }
}