/* ===================================
   KPI CARD ORGANISM
   ===================================
   
   Unified KPI/Stat/Metric card for dashboards.
   Single source of truth for all dashboard stat cards.
   
   SPACING CONTRACT:
   - No external margins
   - Parent controls spacing via grid gap
   - Internal padding via design tokens
   
   STRUCTURE:
   ┌─────────────────────────────────┐
   │ [Icon]  Title                   │
   │         ═══════════════════     │
   │         VALUE                   │
   │         subtitle                │
   │         ─────────────────────   │
   │         ↗ +12.3% trend          │
   └─────────────────────────────────┘
*/

/* ===================================
   BASE CARD
   =================================== */

.kpi-card {
    background: var(--bg-surface);
    border: var(--border-width-1) solid var(--border-subtle);
    border-radius: var(--border-radius-xl);  /* 12px - matches Panel/Sidebar */
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transition: all var(--duration-200) var(--easing-out);
    margin: 0;  /* Parent controls spacing */
}

.kpi-card:hover {
    box-shadow: var(--shadow-sm);
}

.kpi-card.interactive {
    cursor: pointer;
}

.kpi-card.interactive:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-default);
}

/* ===================================
   CARD HEADER (Icon + Title)
   =================================== */

.kpi-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.kpi-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--space-8);
    height: var(--space-8);
    border-radius: var(--border-radius-lg);
    background: var(--bg-panel);
    color: var(--color-primary);
    flex-shrink: 0;
}

.kpi-card-title {
    font-size: var(--text-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    margin: 0;
    flex: 1;
    line-height: 1.3;
}

/* ===================================
   CARD BODY (Value + Subtitle)
   =================================== */

.kpi-card-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.kpi-card-value {
    font-size: var(--text-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    line-height: 1.2;
    margin: 0;
}

.kpi-card-subtitle {
    font-size: var(--text-xs);
    color: var(--text-muted);
    line-height: 1.4;
}

/* ===================================
   CARD FOOTER (Trend Indicator)
   =================================== */

.kpi-card-footer {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding-top: var(--space-2);
    border-top: var(--border-width-1) solid var(--border-subtle);
    margin-top: auto;  /* Push to bottom */
}

.kpi-card-trend {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--border-radius-sm);
}

/* Trend directions */
.kpi-card-trend.trend-up {
    color: var(--color-success);
    background: var(--color-success-light);
}

.kpi-card-trend.trend-down {
    color: var(--color-error);
    background: var(--color-error-light);
}

.kpi-card-trend.trend-neutral {
    color: var(--text-muted);
    background: var(--bg-panel);
}

.kpi-card-trend-arrow {
    font-size: var(--text-sm);
}

/* ===================================
   VALUE STATUS COLORS
   =================================== */

.kpi-card-value.status-excellent,
.kpi-card-value.status-good {
    color: var(--color-success);
}

.kpi-card-value.status-fair {
    color: var(--color-warning);
}

.kpi-card-value.status-poor {
    color: var(--color-error);
}

/* ===================================
   VARIANT STYLES
   =================================== */

/* Variants available for semantic use - clean styling, no left border accents */
.kpi-card.kpi-card-primary,
.kpi-card.kpi-card-success,
.kpi-card.kpi-card-warning,
.kpi-card.kpi-card-error,
.kpi-card.kpi-card-info {
    /* No visual differentiation - relies on content/value status colors */
}

/* Icon colors match variant */
.kpi-card.kpi-card-primary .kpi-card-icon { color: var(--color-primary); }
.kpi-card.kpi-card-success .kpi-card-icon { color: var(--color-success); }
.kpi-card.kpi-card-warning .kpi-card-icon { color: var(--color-warning); }
.kpi-card.kpi-card-error .kpi-card-icon { color: var(--color-error); }
.kpi-card.kpi-card-info .kpi-card-icon { color: var(--color-info); }

/* ===================================
   SIZE VARIANTS
   =================================== */

/* Small */
.kpi-card.kpi-card-sm {
    padding: var(--space-3);
    gap: var(--space-1);
}

.kpi-card.kpi-card-sm .kpi-card-value {
    font-size: var(--text-xl);
}

.kpi-card.kpi-card-sm .kpi-card-icon {
    width: var(--space-6);
    height: var(--space-6);
}

/* Large */
.kpi-card.kpi-card-lg {
    padding: var(--space-6);
    gap: var(--space-3);
}

.kpi-card.kpi-card-lg .kpi-card-value {
    font-size: var(--text-3xl);
}

.kpi-card.kpi-card-lg .kpi-card-icon {
    width: var(--space-10);
    height: var(--space-10);
}

/* ===================================
   GRID LAYOUT
   =================================== */

.kpi-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin: 0;
}

/* Fixed column variants */
.kpi-card-grid.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

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

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

/* ===================================
   RESPONSIVE
   =================================== */

@media (max-width: 1024px) {
    .kpi-card-grid.grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .kpi-card-grid,
    .kpi-card-grid.grid-2,
    .kpi-card-grid.grid-3,
    .kpi-card-grid.grid-4 {
        grid-template-columns: 1fr;
    }
    
    .kpi-card-value {
        font-size: var(--text-xl);
    }
    
    .kpi-card {
        padding: var(--space-3);
    }
}