/* ========================================
   Design System - Based on diseño.md
   ======================================== */

:root {
  /* Colors - Dark Theme */
  --bg-primary: #0B0F17;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2234;
  --bg-hover: #1f2937;
  
  /* Text */
  --text-primary: #f3f4f6;
  --text-secondary: rgba(156, 163, 175, 0.9);
  --text-muted: rgba(107, 114, 128, 0.8);
  
  /* Accent - Purple/Blue elegant */
  --accent: #8b5cf6;
  --accent-hover: #7c3aed;
  --accent-subtle: rgba(139, 92, 246, 0.15);
  --accent-glow: rgba(139, 92, 246, 0.3);
  
  /* States */
  --success: #10b981;
  --success-subtle: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-subtle: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-subtle: rgba(239, 68, 68, 0.15);
  
  /* Borders & Shadows */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: var(--accent);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 15px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  
  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* ========================================
   Reset & Base
   ======================================== */

*, *::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-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
}

/* ========================================
   App Layout
   ======================================== */

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========================================
   Header
   ======================================== */

.header {
  margin-bottom: var(--space-8);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.logo-icon {
  color: var(--accent);
  font-size: 28px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 42px;
  padding: 0 var(--space-5);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md), 0 0 20px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

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

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

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  margin-left: var(--space-2);
  font-family: inherit;
  font-size: 11px;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

/* Alert Badge */
.alert-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-size: 11px;
  font-weight: 600;
  background: var(--danger);
  color: white;
  border-radius: 9px;
  display: none;
}

.alert-badge.visible {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

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

/* ========================================
   Dashboard Stats
   ======================================== */

.dashboard-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.stat-card {
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0.6;
}

.stat-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
  letter-spacing: -0.5px;
}

.stat-subtitle {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ========================================
   Charts Section
   ======================================== */

.charts-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.chart-card {
  min-height: 300px;
}

.chart-container {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 220px;
}

#categoryChart {
  max-width: 180px;
  max-height: 180px;
}

.chart-legend {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

.legend-label {
  flex: 1;
  color: var(--text-secondary);
}

.legend-value {
  font-weight: 600;
  color: var(--text-primary);
}

/* Top Cost List */
.top-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.top-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

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

.top-rank {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-subtle);
  border-radius: 6px;
}

.top-name {
  flex: 1;
  font-weight: 500;
}

.top-price {
  font-weight: 600;
  color: var(--text-primary);
}

.top-freq {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ========================================
   Subscriptions Table
   ======================================== */

.subscriptions-section {
  flex: 1;
  margin-bottom: var(--space-6);
}

.table-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.search-box {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-3);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.search-input {
  width: 180px;
  height: 36px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-size-sm);
  outline: none;
}

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

.select-filter {
  height: 38px;
  padding: 0 var(--space-3);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.select-filter:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.select-filter:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.table-container {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.table tbody tr {
  transition: background var(--transition-fast);
}

.table tbody tr:hover {
  background: var(--bg-tertiary);
}

.table tbody tr.selected {
  background: var(--accent-subtle);
}

.table tbody tr:focus {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.sub-name {
  font-weight: 500;
  color: var(--text-primary);
}

.sub-category {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  background: var(--bg-tertiary);
  border-radius: 20px;
  color: var(--text-secondary);
}

.sub-price {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.sub-frequency {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.sub-billing {
  font-variant-numeric: tabular-nums;
}

.sub-billing.soon {
  color: var(--warning);
}

/* Status Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: 20px;
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-active {
  background: var(--success-subtle);
  color: var(--success);
}

.status-active::before {
  background: var(--success);
}

.status-paused {
  background: var(--warning-subtle);
  color: var(--warning);
}

.status-paused::before {
  background: var(--warning);
}

.status-cancelled {
  background: var(--danger-subtle);
  color: var(--danger);
}

.status-cancelled::before {
  background: var(--danger);
}

/* Row Actions */
.row-actions {
  display: flex;
  gap: var(--space-1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.table tbody tr:hover .row-actions,
.table tbody tr.selected .row-actions {
  opacity: 1;
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.action-btn.delete:hover {
  background: var(--danger-subtle);
  color: var(--danger);
}

/* Empty State */
.empty-row td {
  padding: var(--space-8);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: var(--space-6);
}

.empty-hint {
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
}

.empty-hint kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 8px;
  font-size: 12px;
  font-weight: 500;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin: 0 2px;
}

/* ========================================
   Alerts Panel
   ======================================== */

.alerts-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 360px;
  max-width: 100%;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.alerts-panel.open {
  transform: translateX(0);
  box-shadow: var(--shadow-lg);
}

.alerts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  border-bottom: 1px solid var(--border-color);
}

.alerts-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.alerts-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.alert-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

.alert-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.alert-icon.warning {
  background: var(--warning-subtle);
  color: var(--warning);
}

.alert-icon.danger {
  background: var(--danger-subtle);
  color: var(--danger);
}

.alert-icon.info {
  background: var(--accent-subtle);
  color: var(--accent);
}

.alert-body {
  flex: 1;
  min-width: 0;
}

.alert-title {
  font-weight: 500;
  margin-bottom: 2px;
}

.alert-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ========================================
   Modal
   ======================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 200;
}

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

.modal {
  width: 100%;
  max-width: 480px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.modal-form {
  padding: var(--space-5);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.form-group input,
.form-group select {
  width: 100%;
  height: 44px;
  padding: 0 var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-group input:hover,
.form-group select:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

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

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-color);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border-color);
}

.shortcuts {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-6);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.shortcuts kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 8px;
  margin-right: var(--space-2);
  font-size: 12px;
  font-weight: 500;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
  .app {
    padding: var(--space-4);
  }
  
  .header-content {
    flex-wrap: wrap;
  }
  
  .btn span:not(.alert-badge) {
    display: none;
  }
  
  .btn kbd {
    display: none;
  }
  
  .chart-container {
    flex-direction: column;
    height: auto;
  }
  
  #categoryChart {
    max-width: 160px;
    max-height: 160px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .table th,
  .table td {
    padding: var(--space-3);
  }
  
  .search-input {
    width: 140px;
  }
}

/* ========================================
   Focus Visible (Keyboard Navigation)
   ======================================== */

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline-offset: 0;
}

/* ========================================
   Animations
   ======================================== */

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

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

.table tbody tr {
  animation: slideIn 0.2s ease forwards;
}

.stat-card {
  animation: fadeIn 0.3s ease forwards;
}

.stat-card:nth-child(2) { animation-delay: 0.05s; }
.stat-card:nth-child(3) { animation-delay: 0.1s; }