/* ===================================
   Finance Dashboard - Design System
   Mobile-first, Dark Theme
   =================================== */

/* CSS Variables */
:root {
  /* Colors */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  
  --success: #22c55e;
  --success-light: rgba(34, 197, 94, 0.15);
  
  --warning: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.15);
  
  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.15);
  
  --info: #06b6d4;
  --info-light: rgba(6, 182, 212, 0.15);
  
  /* Surfaces */
  --bg-base: #0f0f0f;
  --bg-surface: #1a1a1a;
  --bg-surface-2: #242424;
  --bg-surface-3: #2e2e2e;
  --bg-hover: #333333;
  
  /* Text */
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Borders */
  --border-color: #333333;
  --border-color-light: #404040;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Z-index */
  --z-dropdown: 100;
  --z-modal: 200;
  --z-fab: 300;
  --z-toast: 400;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }
.text-4xl { font-size: 2.5rem; }

.text-mono { font-family: var(--font-mono); }
.text-muted { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.page {
  padding-bottom: calc(80px + var(--spacing-lg));
}

/* App Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  background: linear-gradient(to bottom, var(--bg-base) 0%, var(--bg-base) 70%, transparent 100%);
  padding: var(--spacing-md) 0 var(--spacing-lg);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.app-logo {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Month Selector */
.month-selector {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--bg-surface);
  border-radius: var(--radius-full);
  padding: var(--spacing-xs) var(--spacing-sm);
}

.month-selector button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.month-selector button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.month-selector .current-month {
  font-weight: 600;
  min-width: 120px;
  text-align: center;
}

/* Summary Strip */
.summary-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.summary-item {
  background: var(--bg-surface);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.summary-item.featured {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--primary-light) 100%);
  border-color: var(--primary);
}

.summary-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.summary-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.summary-item.featured .summary-value {
  font-size: 2.5rem;
}

.summary-value.positive { color: var(--success); }
.summary-value.negative { color: var(--danger); }
.summary-value.warning { color: var(--warning); }

/* Cards */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--border-color-light);
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.card-title .icon {
  opacity: 0.7;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-body.no-padding {
  padding: 0;
}

/* Progress Bars */
.progress-container {
  margin-bottom: var(--spacing-md);
}

.progress-container:last-child {
  margin-bottom: 0;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--spacing-xs);
}

.progress-category {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.progress-category .dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
}

.progress-values {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.progress-bar {
  height: 8px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  background: var(--success);
}

.progress-fill.warning {
  background: linear-gradient(90deg, var(--success) 0%, var(--warning) 100%);
}

.progress-fill.over {
  background: linear-gradient(90deg, var(--warning) 0%, var(--danger) 100%);
}

/* Goal Bar */
.goal-bar {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
}

.goal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.goal-name {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.goal-name .icon {
  color: var(--info);
}

.goal-progress-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.goal-progress-bar {
  height: 12px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.goal-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--info) 0%, var(--primary) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  position: relative;
}

.goal-progress-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 30px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3));
}

/* Merchant List */
.merchant-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.merchant-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.merchant-item:last-child {
  border-bottom: none;
}

.merchant-name {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.merchant-rank {
  width: 24px;
  height: 24px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.merchant-amount {
  font-family: var(--font-mono);
  font-weight: 600;
}

/* Trend Chart Container */
.trend-chart {
  height: 200px;
  position: relative;
}

/* Floating Action Button */
.fab {
  position: fixed;
  bottom: calc(70px + var(--spacing-lg));
  right: var(--spacing-md);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  z-index: var(--z-fab);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.fab:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.5);
}

.fab:active {
  transform: scale(0.95);
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-sm) 0;
  padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
  z-index: var(--z-dropdown);
}

.nav-items {
  display: flex;
  justify-content: space-around;
  max-width: 500px;
  margin: 0 auto;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--spacing-xs) var(--spacing-md);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.625rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  border-radius: var(--radius-md);
}

.nav-item .icon {
  font-size: 1.25rem;
}

.nav-item:hover,
.nav-item.active {
  color: var(--primary);
}

.nav-item.active {
  background: var(--primary-light);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-surface);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background: var(--bg-surface);
}

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

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-surface-3);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--spacing-lg);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-surface-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

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

.form-input.large {
  font-size: 2rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-align: center;
  padding: var(--spacing-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);
  color: white;
}

.btn-primary:hover {
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-surface-2);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

.btn-danger {
  background: var(--danger-light);
  color: var(--danger);
}

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

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
}

/* Category Pills */
.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.category-pill {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-surface-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-pill:hover {
  border-color: var(--border-color-light);
}

.category-pill.selected {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

/* Transaction List */
.transaction-list {
  display: flex;
  flex-direction: column;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.transaction-item:hover {
  background: var(--bg-hover);
}

.transaction-item:last-child {
  border-bottom: none;
}

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

.transaction-category-dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.transaction-details {
  display: flex;
  flex-direction: column;
}

.transaction-merchant {
  font-weight: 500;
}

.transaction-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  gap: var(--spacing-sm);
}

.transaction-amount {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
}

/* Calendar */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.calendar-header {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  padding: var(--spacing-sm);
  font-weight: 600;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: var(--spacing-xs);
  position: relative;
}

.calendar-day:hover {
  background: var(--bg-hover);
}

.calendar-day.other-month {
  opacity: 0.3;
}

.calendar-day.today {
  border: 2px solid var(--primary);
}

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

.calendar-day .day-number {
  font-size: 0.875rem;
  font-weight: 500;
}

.calendar-day .day-amount {
  font-size: 0.625rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.calendar-day.selected .day-amount {
  color: rgba(255, 255, 255, 0.8);
}

.calendar-day .paycheck-dot {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--success);
}

.calendar-day .paycheck-dot.bonus {
  background: var(--warning);
}

/* Heat Intensity */
.calendar-day.heat-1 { background: rgba(239, 68, 68, 0.1); }
.calendar-day.heat-2 { background: rgba(239, 68, 68, 0.2); }
.calendar-day.heat-3 { background: rgba(239, 68, 68, 0.3); }
.calendar-day.heat-4 { background: rgba(239, 68, 68, 0.4); }
.calendar-day.heat-5 { background: rgba(239, 68, 68, 0.5); }

/* Budget Table */
.budget-table {
  width: 100%;
}

.budget-row {
  display: grid;
  grid-template-columns: 1fr 100px 100px 80px;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  align-items: center;
}

.budget-row.header {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.budget-row:last-child {
  border-bottom: none;
}

.budget-category {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.budget-input {
  width: 100%;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-surface-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-align: right;
}

.budget-input:focus {
  outline: none;
  border-color: var(--primary);
}

.budget-actual {
  font-family: var(--font-mono);
  text-align: right;
}

.budget-variance {
  font-family: var(--font-mono);
  text-align: right;
  font-weight: 600;
}

.budget-variance.positive { color: var(--success); }
.budget-variance.negative { color: var(--danger); }

/* Loading States */
.skeleton {
  background: linear-gradient(90deg, var(--bg-surface-2) 25%, var(--bg-surface-3) 50%, var(--bg-surface-2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: slideIn 0.3s ease;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state p {
  margin-bottom: var(--spacing-lg);
}

/* Responsive */
@media (min-width: 640px) {
  .summary-strip {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .summary-item.featured {
    grid-column: span 1;
  }
  
  .cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .modal {
    border-radius: var(--radius-xl);
    max-width: 600px;
    margin: auto;
  }
  
  .modal-overlay {
    align-items: center;
  }
}

/* Utilities */
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }

.hidden { display: none !important; }