@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* Design System Tokens */
:root {
  /* Default Light Theme */
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --bg-color: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --card-bg: rgba(255, 255, 255, 0.65);
  --card-border: rgba(255, 255, 255, 0.8);
  --card-shadow: 0 8px 32px 0 rgba(148, 163, 184, 0.15);
  --card-hover-shadow: 0 12px 40px 0 rgba(148, 163, 184, 0.25);
  
  --accent-primary: #3b82f6; /* Electric Blue */
  --accent-primary-rgb: 59, 130, 246;
  --accent-secondary: #06b6d4; /* Cyan */
  --accent-success: #10b981; /* Emerald */
  --accent-success-muted: rgba(16, 185, 129, 0.15);
  --accent-danger: #ef4444; /* Rose */
  --accent-danger-muted: rgba(239, 68, 68, 0.15);
  
  --calendar-empty: #e2e8f0;
  --calendar-scale-1: #dbeafe;
  --calendar-scale-2: #93c5fd;
  --calendar-scale-3: #3b82f6;
  --calendar-scale-4: #1d4ed8;

  --transition-speed: 0.3s;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Dark Theme Overrides */
    --bg-gradient: linear-gradient(135deg, #090d16 0%, #020617 100%);
    --bg-color: #020617;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --card-bg: rgba(15, 23, 42, 0.45);
    --card-border: rgba(255, 255, 255, 0.05);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --card-hover-shadow: 0 12px 48px 0 rgba(0, 0, 0, 0.5);
    
    --accent-primary: #60a5fa;
    --accent-primary-rgb: 96, 165, 250;
    --accent-secondary: #22d3ee;
    --accent-success: #34d399;
    --accent-success-muted: rgba(52, 211, 153, 0.15);
    --accent-danger: #fb7185;
    --accent-danger-muted: rgba(251, 113, 133, 0.15);
    
    --calendar-empty: #1e293b;
    --calendar-scale-1: #1e3a8a;
    --calendar-scale-2: #2563eb;
    --calendar-scale-3: #60a5fa;
    --calendar-scale-4: #93c5fd;
  }
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  padding: 40px 20px;
  transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Premium Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

/* Glassmorphism Card Style Base */
.glass-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), 
              box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1), 
              background var(--transition-speed) ease, 
              border var(--transition-speed) ease;
}

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

/* Header Section */
header {
  margin-bottom: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  text-align: center;
}

.brand-section h1 {
  font-size: 2.25rem;
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  font-weight: 800;
  letter-spacing: -0.05em;
}

.brand-section p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 4px;
  font-weight: 500;
}

.last-update-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 6px 12px;
  border-radius: 9999px;
  background: rgba(var(--accent-primary-rgb), 0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(var(--accent-primary-rgb), 0.15);
}

/* Highlighted Last Run Callout */
.last-run-callout {
  margin-bottom: 32px;
  border-left: 4px solid var(--accent-primary);
  background: linear-gradient(90deg, rgba(var(--accent-primary-rgb), 0.05) 0%, transparent 100%);
}

.last-run-callout h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.last-run-callout .run-details {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.last-run-callout .run-days-since {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
  font-weight: 600;
}

/* Metrics Section Layout */
.metrics-section {
  margin-bottom: 32px;
}

.metrics-section-title {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

@media (max-width: 1024px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
}

/* Stat Cards */
.stat-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.stat-value-container {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.stat-comparison {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

.trend-indicator {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  border-radius: 4px;
}

.trend-up {
  background-color: var(--accent-success-muted);
  color: var(--accent-success);
}

.trend-down {
  background-color: var(--accent-danger-muted);
  color: var(--accent-danger);
}

.trend-neutral {
  background-color: var(--card-border);
  color: var(--text-muted);
}

.stat-prev-val {
  color: var(--text-muted);
}

/* Charts Layout Grid */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

@media (max-width: 1024px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

.chart-card {
  min-height: 380px;
}

.chart-card h3 {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 600;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 10px;
}

/* Calendar Heatmap styles */
.heatmap-section {
  margin-bottom: 40px;
}

.heatmap-card {
  overflow-x: auto;
}

.heatmap-card h3 {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 600;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 10px;
}

/* Interactive SVG Calendar Heatmap styles */
.calendar-svg-container {
  width: 100%;
  min-width: 760px;
  margin: 0 auto;
}

.calendar-day {
  cursor: pointer;
  rx: 2px;
  ry: 2px;
  transition: stroke var(--transition-speed) ease, stroke-width var(--transition-speed) ease;
}

.calendar-day:hover {
  stroke: var(--text-primary);
  stroke-width: 1px;
}

.calendar-month-label, .calendar-day-label {
  fill: var(--text-secondary);
  font-size: 9px;
  font-weight: 500;
}

/* Legend inside heatmap */
.calendar-legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.legend-box {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.legend-box.empty { background-color: var(--calendar-empty); }
.legend-box.scale1 { background-color: var(--calendar-scale-1); }
.legend-box.scale2 { background-color: var(--calendar-scale-2); }
.legend-box.scale3 { background-color: var(--calendar-scale-3); }
.legend-box.scale4 { background-color: var(--calendar-scale-4); }

/* Tooltip design for Custom Calendar */
.heatmap-tooltip {
  position: absolute;
  background: var(--text-primary);
  color: var(--bg-color);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 100;
  white-space: nowrap;
}

/* Footer Section */
footer {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid var(--card-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--accent-primary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  transition: color var(--transition-speed) ease;
}

.footer-links a:hover {
  color: var(--accent-secondary);
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}