/* Design Tokens - Books by LeanAtom */
:root {
  --color-bg: #f5f3f7;
  --color-surface: #ffffff;
  --color-primary: #7c3aed;
  --color-primary-light: #a78bfa;
  --color-income: #059669;
  --color-expense: #dc2626;
  --color-border: #e9e5f0;
  --color-text: #1e1b2e;
  --color-muted: #6b6180;
  --shadow-card: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, #7c3aed, #9333ea);
  color: #ffffff;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.app-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  white-space: nowrap;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.header-controls input[type="date"] {
  padding: 0.375rem 0.625rem;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  background: rgba(255,255,255,0.15);
  color: #ffffff;
  font-size: 0.8125rem;
}

.header-controls input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(1);
}

.btn-signout {
  padding: 0.375rem 0.75rem;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  background: rgba(255,255,255,0.1);
  color: #ffffff;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-signout:hover {
  background: rgba(255,255,255,0.2);
}

/* Navigation Tabs */
.nav-tabs {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 0;
  padding: 0 1.5rem;
  overflow-x: auto;
}

.nav-tab {
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--color-primary);
}

.nav-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Main Content */
.main-content {
  padding: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.stat-card .stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  margin-bottom: 0.375rem;
}

.stat-card .stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.stat-card .stat-value.income {
  color: var(--color-income);
}

.stat-card .stat-value.expense {
  color: var(--color-expense);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1rem;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

thead th {
  text-align: left;
  padding: 0.625rem 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}

thead th:hover {
  color: var(--color-primary);
}

thead th.sorted-asc::after {
  content: ' \u25B2';
  font-size: 0.625rem;
}

thead th.sorted-desc::after {
  content: ' \u25BC';
  font-size: 0.625rem;
}

tbody tr {
  cursor: pointer;
  transition: background 0.15s;
}

tbody tr:hover {
  background: #f9f7fc;
}

tbody td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.text-income { color: var(--color-income); font-weight: 600; }
.text-expense { color: var(--color-expense); font-weight: 600; }
.text-muted { color: var(--color-muted); }

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn:hover { opacity: 0.9; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: linear-gradient(135deg, #7c3aed, #9333ea);
  color: #ffffff;
}

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

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
}

/* Filter Pills */
.filter-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.filter-pill {
  padding: 0.375rem 0.875rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  cursor: pointer;
  transition: all 0.2s;
}

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

.filter-pill.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

/* Chart Containers */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.chart-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.chart-card .chart-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.chart-card canvas {
  width: 100% !important;
  height: 200px !important;
}

/* Detail View */
.detail-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: border-color 0.2s;
}

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

.detail-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

/* COGS Form */
.cogs-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.75rem;
  align-items: end;
}

.cogs-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.cogs-form .form-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
}

.cogs-form .form-group input,
.cogs-form .form-group select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--color-text);
}

.cogs-form .form-group input:focus,
.cogs-form .form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.cogs-list {
  margin-top: 1rem;
}

.cogs-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: var(--color-surface);
}

.cogs-item-info {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8125rem;
}

.cogs-item-info span {
  color: var(--color-muted);
}

.cogs-item-info strong {
  color: var(--color-text);
}

.btn-delete {
  padding: 0.25rem 0.5rem;
  border: none;
  border-radius: 4px;
  background: #fef2f2;
  color: var(--color-expense);
  font-size: 0.75rem;
  cursor: pointer;
}

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

/* Inventory Form */
.inventory-form {
  display: grid;
  grid-template-columns: repeat(5, 1fr) auto;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 1.5rem;
}

.inventory-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.inventory-form .form-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
}

.inventory-form .form-group input {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--color-text);
}

.inventory-form .form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

/* Reorder Config */
.reorder-config {
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.reorder-config input {
  width: 60px;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.8125rem;
}

/* Text utility classes */
.text-expense {
  color: var(--color-expense);
  font-weight: 600;
}

.text-income {
  color: var(--color-income);
  font-weight: 600;
}

/* Page sections */
.page-section {
  display: none;
}

.page-section.active {
  display: block;
}

/* Loading */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.loading::after {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-left: 0.5rem;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* Export button */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .charts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: 0.75rem 1rem;
  }

  .app-header h1 {
    font-size: 1rem;
  }

  .main-content {
    padding: 1rem;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .stat-card {
    padding: 1rem;
  }

  .stat-card .stat-value {
    font-size: 1.25rem;
  }

  .cogs-form {
    grid-template-columns: 1fr;
  }

  .inventory-form {
    grid-template-columns: 1fr 1fr;
  }

  .nav-tabs {
    padding: 0 1rem;
  }

  .nav-tab {
    padding: 0.625rem 1rem;
    font-size: 0.8125rem;
  }
}

@media (max-width: 480px) {
  .stats-row {
    grid-template-columns: 1fr;
  }

  .header-controls {
    width: 100%;
    justify-content: space-between;
  }
}