/* ===== CSS Variables ===== */
:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --secondary: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --pink: #ec4899;
  --cyan: #06b6d4;
  --blue: #3b82f6;
  
  --bg-primary: #f8fafc;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  
  --transition: all 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
  outline: none;
}

/* ===== App Container ===== */
.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

/* ===== Header ===== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  gap: 8px;
}

.nav-btn {
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  background: var(--bg-input);
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.nav-btn.active {
  background: var(--primary);
  color: white;
}

/* ===== Reminder Banner ===== */
.reminder-banner {
  background: linear-gradient(135deg, var(--warning), #fb923c);
  color: white;
  padding: 16px 24px;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  animation: slideDown 0.3s ease;
}

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

.reminder-banner p {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reminder-banner button {
  background: rgba(255,255,255,0.2);
  color: white;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: var(--transition);
}

.reminder-banner button:hover {
  background: rgba(255,255,255,0.3);
}

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== Metrics Grid ===== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.metric-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
  position: relative;
}

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

.metric-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.metric-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.metric-type-badge {
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 20px;
  background: var(--bg-input);
  color: var(--text-secondary);
  font-weight: 500;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  margin: 8px 0;
}

.metric-value .unit {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

.metric-empty {
  color: var(--text-muted);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.metric-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.btn-small {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.btn-edit {
  background: var(--bg-input);
  color: var(--text-secondary);
}

.btn-edit:hover {
  background: var(--border);
}

.btn-delete {
  background: #fef2f2;
  color: var(--danger);
}

.btn-delete:hover {
  background: #fee2e2;
}

/* Mini sparkline for last 7 days */
.metric-sparkline {
  height: 30px;
  display: flex;
  align-items: flex-end;
  gap: 2px;
  margin-top: 12px;
}

.sparkline-bar {
  flex: 1;
  background: var(--primary);
  opacity: 0.3;
  border-radius: 2px 2px 0 0;
  transition: var(--transition);
  min-height: 4px;
}

.sparkline-bar.filled {
  opacity: 1;
}

.sparkline-bar.today {
  background: var(--secondary);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 20px;
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Buttons ===== */
.btn {
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #059669;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
  padding: 20px;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 32px;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--border);
  color: var(--text-primary);
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  color: var(--text-primary);
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--primary);
  background: var(--bg-card);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Type selector */
.type-selector {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.type-option {
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.type-option:hover {
  border-color: var(--border-hover);
}

.type-option.selected {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

.type-option-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.type-option-label {
  font-weight: 500;
  font-size: 0.9rem;
}

.type-option-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Color picker */
.color-picker {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.color-swatch {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  border: 3px solid transparent;
}

.color-swatch:hover {
  transform: scale(1.1);
}

.color-swatch.selected {
  border-color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

/* Scale buttons */
.scale-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.scale-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  font-weight: 600;
  transition: var(--transition);
}

.scale-btn:hover {
  background: var(--border);
}

.scale-btn.selected {
  background: var(--primary);
  color: white;
}

/* Toggle switch */
.toggle-container {
  display: flex;
  gap: 12px;
}

.toggle-btn {
  flex: 1;
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1.1rem;
  transition: var(--transition);
}

.toggle-btn:hover {
  border-color: var(--border-hover);
}

.toggle-btn.selected-yes {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.toggle-btn.selected-no {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

/* Date picker */
.date-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding: 12px 16px;
  background: var(--bg-input);
  border-radius: var(--radius-md);
}

.date-picker-wrapper input[type="date"] {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.date-nav-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.date-nav-btn:hover {
  background: var(--border);
}

/* ===== Calendar ===== */
.calendar {
  margin-top: 16px;
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.calendar-month-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.calendar-month {
  font-weight: 600;
  font-size: 1.1rem;
  min-width: 150px;
  text-align: center;
}

.calendar-nav-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.calendar-nav-btn:hover {
  background: var(--border);
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-bottom: 8px;
}

.calendar-weekday {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 8px 0;
}

.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.calendar-day:hover:not(.empty):not(.future) {
  background: var(--bg-input);
}

.calendar-day.empty {
  cursor: default;
}

.calendar-day.today {
  background: var(--primary);
  color: white;
}

.calendar-day.complete {
  background: var(--success);
  color: white;
}

.calendar-day.partial {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.calendar-day.missed {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.calendar-day.future {
  color: var(--text-muted);
}

/* ===== Charts ===== */
.chart-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.chart-title {
  font-weight: 600;
  font-size: 1.1rem;
}

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

.period-btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-input);
  color: var(--text-secondary);
  transition: var(--transition);
}

.period-btn:hover {
  background: var(--border);
}

.period-btn.active {
  background: var(--primary);
  color: white;
}

.chart-wrapper {
  position: relative;
  width: 100%;
  height: 300px;
}

.chart-tooltip {
  position: absolute;
  background: var(--text-primary);
  color: white;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  pointer-events: none;
  z-index: 100;
  white-space: nowrap;
  transform: translate(-50%, -100%);
  margin-top: -10px;
}

.chart-tooltip::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--text-primary);
  border-bottom: none;
}

/* Heatmap */
.heatmap-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  justify-content: center;
}

.heatmap-cell {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--bg-input);
  transition: var(--transition);
  cursor: pointer;
}

.heatmap-cell:hover {
  transform: scale(1.3);
}

.heatmap-cell.level-1 { background: rgba(99, 102, 241, 0.2); }
.heatmap-cell.level-2 { background: rgba(99, 102, 241, 0.4); }
.heatmap-cell.level-3 { background: rgba(99, 102, 241, 0.6); }
.heatmap-cell.level-4 { background: rgba(99, 102, 241, 0.8); }
.heatmap-cell.level-5 { background: var(--primary); }

/* Bar chart for weekdays */
.weekday-chart {
  display: flex;
  justify-content: space-around;
  align-items: flex-end;
  height: 200px;
  padding: 20px 0;
  gap: 12px;
}

.weekday-bar-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  max-width: 60px;
}

.weekday-bar {
  width: 100%;
  background: linear-gradient(to top, var(--primary), var(--secondary));
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: var(--transition);
  min-height: 4px;
}

.weekday-bar:hover {
  opacity: 0.8;
}

.weekday-label {
  margin-top: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.weekday-value {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

/* ===== Analytics ===== */
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.analytics-card {
  background: var(--bg-input);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.analytics-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
}

.analytics-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: linear-gradient(135deg, var(--warning), #fb923c);
  color: white;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

/* ===== Legend ===== */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

/* ===== Loading ===== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  
  .header-nav {
    width: 100%;
    justify-content: center;
  }
  
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  
  .modal {
    padding: 24px;
  }
  
  .type-selector {
    grid-template-columns: 1fr;
  }
  
  .chart-wrapper {
    height: 250px;
  }
  
  .analytics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }