/* Layout System - Grid & Flex - Black & White */

/* App Container */
.app {
  display: flex;
  min-height: 100vh;
  background: var(--bg-primary);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: width var(--transition-base);
}

.sidebar-header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--border);
}

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

.sidebar-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--text-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  flex-shrink: 0;
  color: var(--text-inverse);
}

.sidebar-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--text-primary);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3);
  overflow-y: auto;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  margin-bottom: var(--space-1);
}

.sidebar-nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-nav-item.active {
  background: var(--text-primary);
  color: var(--text-inverse);
}

.sidebar-nav-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
}

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

/* Main Content */
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-base);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  z-index: var(--z-sticky);
}

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

.header-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--text-primary);
}

.header-date {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

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

/* Content Area */
.content {
  flex: 1;
  padding: var(--space-5);
  overflow-y: auto;
}

/* Section */
.section {
  display: none;
}

.section.active {
  display: block;
}

/* Grid Systems */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Flex Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.flex-1 { flex: 1; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }

/* Container */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
}

/* Page Header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.page-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--text-primary);
}

.page-actions {
  display: flex;
  gap: var(--space-3);
}

/* Category Grid Specific */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

/* Budget Item Layout */
.budget-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border-subtle);
}

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

.budget-item-info {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 150px;
}

.budget-item-input {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  max-width: 200px;
}

.budget-item-input .currency-symbol {
  color: var(--text-secondary);
}

.budget-item-progress {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.budget-item-progress .progress-bar {
  flex: 1;
}

.budget-item-percent {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  min-width: 40px;
  text-align: right;
}

/* Category Card */
.category-card {
  position: relative;
}

.category-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
}

.category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.category-info {
  flex: 1;
}

.category-name {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.category-type {
  font-size: var(--text-xs);
}

.category-stats {
  margin-bottom: var(--space-4);
}

.category-stats .stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
}

.category-stats .stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.category-stats .stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.category-actions {
  display: flex;
  gap: var(--space-2);
}

/* Subscription Info in Settings */
#subscription-info {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.subscription-detail {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.subscription-detail:last-child {
  border-bottom: none;
}

.subscription-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.subscription-value {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}