/* ==========================================================================
   Apple Liquid Glass Design System
   Electricity Ingestion & Analysis System
   ========================================================================== */

:root {
  /* Ambient Multi-Point Canvas Background */
  --bg-mesh: radial-gradient(at 0% 0%, rgba(210, 230, 255, 0.75) 0px, transparent 55%),
             radial-gradient(at 100% 0%, rgba(230, 215, 255, 0.65) 0px, transparent 50%),
             radial-gradient(at 50% 100%, rgba(215, 245, 235, 0.7) 0px, transparent 55%),
             #f2f3f7;

  /* Glass Surface Tokens */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-bg-subtle: rgba(255, 255, 255, 0.45);
  --glass-bg-hover: rgba(255, 255, 255, 0.82);
  --glass-bg-active: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-border-subtle: rgba(0, 0, 0, 0.07);
  --glass-specular: inset 0 1px 1.5px 0 rgba(255, 255, 255, 0.85);
  --glass-shadow: 0 12px 32px -4px rgba(0, 0, 0, 0.05), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
  --glass-shadow-hover: 0 20px 44px -6px rgba(0, 0, 0, 0.09), 0 6px 16px -2px rgba(0, 0, 0, 0.04);
  --glass-blur: blur(28px) saturate(190%);

  /* Apple System Palette */
  --apple-blue: #0071e3;
  --apple-blue-light: #47a0ff;
  --apple-blue-glow: rgba(0, 113, 227, 0.25);
  --apple-green: #34c759;
  --apple-green-glow: rgba(52, 199, 89, 0.22);
  --apple-orange: #ff9500;
  --apple-orange-glow: rgba(255, 149, 0, 0.22);
  --apple-red: #ff3b30;
  --apple-red-glow: rgba(255, 59, 48, 0.22);
  --apple-teal: #30b0c7;
  --apple-indigo: #5856d6;

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;

  /* Radii & Motion */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --spring-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s var(--spring-ease);
  --transition-smooth: 0.35s var(--spring-ease);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-mesh: radial-gradient(at 0% 0%, rgba(20, 38, 70, 0.8) 0px, transparent 55%),
               radial-gradient(at 100% 0%, rgba(45, 20, 65, 0.7) 0px, transparent 50%),
               radial-gradient(at 50% 100%, rgba(15, 45, 38, 0.75) 0px, transparent 55%),
               #09090b;
    --glass-bg: rgba(28, 28, 32, 0.72);
    --glass-bg-subtle: rgba(28, 28, 32, 0.48);
    --glass-bg-hover: rgba(42, 42, 48, 0.85);
    --glass-bg-active: rgba(55, 55, 62, 0.95);
    --glass-border: rgba(255, 255, 255, 0.14);
    --glass-border-subtle: rgba(255, 255, 255, 0.08);
    --glass-specular: inset 0 1px 1px 0 rgba(255, 255, 255, 0.22);
    --glass-shadow: 0 16px 40px -4px rgba(0, 0, 0, 0.55), 0 4px 16px -2px rgba(0, 0, 0, 0.35);
    --glass-shadow-hover: 0 24px 50px -4px rgba(0, 0, 0, 0.65), 0 8px 24px -2px rgba(0, 0, 0, 0.45);
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;
    --apple-blue: #2997ff;
    --apple-blue-light: #64b5ff;
    --apple-blue-glow: rgba(41, 151, 255, 0.3);
  }
}

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

body {
  font-family: var(--font-family, var(--font-system));
  background: var(--bg-mesh);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: 60px;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Glass Header */
.glass-header {
  position: sticky;
  top: 16px;
  z-index: 100;
  margin-bottom: 32px;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular), var(--glass-shadow);
  border-radius: var(--radius-xl);
  transition: all var(--transition-smooth);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--apple-blue) 0%, var(--apple-indigo) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 14px var(--apple-blue-glow);
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.brand-title p {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Glass Select & Controls */
.glass-select {
  appearance: none;
  background: var(--glass-bg-hover);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 36px 8px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.glass-select:hover, .glass-select:focus {
  background-color: var(--glass-bg-active);
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 3px var(--apple-blue-glow);
}

/* Glass Buttons */
.btn-glass {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  box-shadow: var(--glass-specular), var(--glass-shadow);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-glass:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-1px);
  box-shadow: var(--glass-shadow-hover);
}

.btn-primary {
  background: linear-gradient(180deg, var(--apple-blue-light) 0%, var(--apple-blue) 100%);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.4), 0 4px 14px var(--apple-blue-glow);
}

.btn-primary:hover {
  background: linear-gradient(180deg, var(--apple-blue) 0%, #005bb5 100%);
  box-shadow: 0 6px 18px var(--apple-blue-glow);
}

/* Flash Messages */
.flash-card {
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  box-shadow: var(--glass-specular), var(--glass-shadow);
  animation: slideDown 0.4s var(--spring-ease);
}

.flash-success {
  background: rgba(52, 199, 89, 0.15);
  border: 1px solid rgba(52, 199, 89, 0.35);
  color: var(--text-primary);
}

.flash-error {
  background: rgba(255, 59, 48, 0.15);
  border: 1px solid rgba(255, 59, 48, 0.35);
  color: var(--text-primary);
}

/* KPI Summary Cards Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.glass-card {
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-specular), var(--glass-shadow);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  transition: all var(--transition-smooth);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--glass-specular), var(--glass-shadow-hover);
}

.kpi-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.kpi-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.kpi-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

.kpi-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border-subtle);
}

.kpi-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.kpi-unit {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-left: 4px;
}

.kpi-subtext {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* Chart Container & Toolbar */
.chart-section {
  margin-bottom: 32px;
}

.chart-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.chart-title-group h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.chart-title-group p {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Apple-style Segmented Control */
.segmented-control {
  display: inline-flex;
  padding: 4px;
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border-subtle);
  border-radius: var(--radius-md);
  gap: 2px;
}

.segment-btn {
  background: transparent;
  border: none;
  padding: 6px 14px;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: calc(var(--radius-md) - 4px);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.segment-btn.active {
  background: var(--glass-bg-active);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), var(--glass-specular);
}

.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 380px;
  padding-top: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(140, 140, 150, 0.4) transparent;
}

/* Custom Apple Glass Scrollbar */
.chart-canvas-wrapper::-webkit-scrollbar {
  height: 7px;
}

.chart-canvas-wrapper::-webkit-scrollbar-track {
  background: var(--glass-bg-subtle);
  border-radius: 10px;
  margin: 0 16px;
}

.chart-canvas-wrapper::-webkit-scrollbar-thumb {
  background: rgba(140, 140, 150, 0.38);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 10px;
  border: 1.5px solid transparent;
  background-clip: padding-box;
  transition: background var(--transition-fast);
}

.chart-canvas-wrapper::-webkit-scrollbar-thumb:hover {
  background: rgba(140, 140, 150, 0.65);
}

/* Interactive SVG Chart */
.svg-chart {
  display: block;
  height: 100%;
  overflow: visible;
}

.chart-grid-line {
  stroke: var(--glass-border-subtle);
  stroke-dasharray: 4 4;
}

.chart-axis-text {
  fill: var(--text-tertiary);
  font-size: 11px;
  font-family: inherit;
}

.chart-line {
  fill: none;
  stroke: var(--apple-blue);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-area {
  fill: url(#areaGlowGradient);
}

.chart-peak-marker {
  fill: #fff;
  stroke: var(--apple-blue);
  stroke-width: 3;
  filter: drop-shadow(0 2px 8px var(--apple-blue-glow));
}

.chart-baseload-line {
  stroke: var(--apple-teal);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
  opacity: 0.75;
}

/* Floating Glass Tooltip */
.glass-tooltip {
  position: absolute;
  pointer-events: none;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(18, 18, 22, 0.82);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.8rem;
  line-height: 1.4;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.15s ease, transform 0.15s ease;
  transform: translate(-50%, -120%);
}

.glass-tooltip.visible {
  opacity: 1;
}

/* Drag and Drop Zone */
.glass-dropzone {
  border: 2px dashed var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-smooth);
  background: var(--glass-bg-subtle);
}

.glass-dropzone:hover, .glass-dropzone.dragover {
  border-color: var(--apple-blue);
  background: rgba(0, 113, 227, 0.08);
  box-shadow: 0 0 0 6px var(--apple-blue-glow);
  transform: scale(1.005);
}

.dropzone-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background: var(--glass-bg-hover);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--apple-blue);
  box-shadow: var(--glass-specular);
}

.dropzone-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.dropzone-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* Glass Tables */
.glass-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  margin-top: 14px;
}

.glass-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.85rem;
}

.glass-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--glass-border-subtle);
  background: var(--glass-bg-subtle);
}

.glass-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--glass-border-subtle);
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.badge-success {
  background: rgba(52, 199, 89, 0.18);
  color: #28a745;
  border: 1px solid rgba(52, 199, 89, 0.3);
}

.badge-warning {
  background: rgba(255, 149, 0, 0.18);
  color: #d97706;
  border: 1px solid rgba(255, 149, 0, 0.3);
}

.badge-error {
  background: rgba(255, 59, 48, 0.18);
  color: #dc3545;
  border: 1px solid rgba(255, 59, 48, 0.3);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }
  .chart-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .kpi-value {
    font-size: 1.6rem;
  }
}

/* Top Header Date Filter Panel */
.date-filter-panel {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 6px 10px;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.6), 0 2px 8px rgba(0, 0, 0, 0.03);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

@media (prefers-color-scheme: dark) {
  .date-filter-panel {
    background: rgba(255, 255, 255, 0.06);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.12), 0 2px 8px rgba(0, 0, 0, 0.2);
  }
}

.date-picker-row {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
}

.date-picker-input {
  padding: 4px 8px;
  height: 30px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.date-picker-btn {
  padding: 4px 12px;
  height: 30px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.quick-range-group {
  display: flex;
  align-items: center;
  gap: 4px;
  width: 100%;
}

/* Quick Date Range Shortcut Buttons */
.btn-shortcut {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 3px 6px;
  font-family: var(--font-family);
  font-size: 0.71rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  box-shadow: var(--glass-specular), 0 1px 2px rgba(0, 0, 0, 0.03);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn-shortcut:hover {
  background: var(--glass-bg-hover);
  color: var(--apple-blue);
  border-color: rgba(0, 113, 227, 0.35);
  box-shadow: 0 2px 8px var(--apple-blue-glow);
  transform: translateY(-1px);
}

.btn-shortcut:active {
  transform: translateY(0);
  background: var(--glass-bg-active);
}

.btn-shortcut.active {
  background: var(--apple-blue);
  color: #ffffff;
  border-color: var(--apple-blue);
  box-shadow: 0 2px 8px var(--apple-blue-glow);
}

/* Status Dot for Database Connection */
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  cursor: help;
  position: relative;
}

.status-dot.status-online {
  background: var(--apple-green);
  box-shadow: 0 0 0 2px rgba(52, 199, 89, 0.22), 0 0 8px var(--apple-green-glow);
}

.status-dot.status-offline {
  background: var(--apple-red);
  box-shadow: 0 0 0 2px rgba(255, 59, 48, 0.22), 0 0 8px var(--apple-red-glow);
}

/* Text Link Buttons */
.btn-link {
  background: none;
  border: none;
  color: var(--apple-blue);
  cursor: pointer;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}
.btn-link:hover {
  opacity: 1;
  text-decoration: underline;
}