/* ------------------------------------------- */
/* ------ PERFORMANCE (v9 - Polished Edition) ---- */
/* ------------------------------------------- */

/* --- Overall Layout & Theming --- */
.performance-screen-layout {
    display: flex;
    flex-direction: column;
    gap: 24px;
    height: 100%;
}
:root {
    --perf-bg-widget: var(--bg-secondary);
    --perf-border: var(--border-secondary);
    --perf-text-header: var(--text-primary);
    --perf-text-body: var(--text-secondary);
    --perf-accent-1: var(--accent-primary);
    --perf-accent-2: var(--accent-secondary);
}

/* Stagger Animation */
.perf-stagger-in {
    animation: stagger-fade-in 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
    animation-delay: calc(var(--stagger, 0) * 120ms);
}

/* --- Controls Header --- */
.performance-controls-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background-color: var(--perf-bg-widget);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}
.view-toggle {
    display: flex;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 6px;
}
.view-toggle .toggle-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--perf-text-body);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.view-toggle .toggle-btn.active {
    background-color: var(--bg-secondary);
    color: var(--perf-accent-1);
    box-shadow: var(--shadow-sm);
}
.filter-group {
    display: flex;
    gap: 16px;
    align-items: center;
}

/* --- KPI Cards --- */
.kpi-widget-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}
.kpi-card-perf {
    background-color: var(--perf-bg-widget);
    padding: 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--perf-accent-1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.kpi-card-perf:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.kpi-card-perf .label {
    font-size: var(--font-size-sm);
    color: var(--perf-text-body);
    font-weight: 500;
    margin-bottom: 8px;
}
.kpi-card-perf .value {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--perf-text-header);
    line-height: 1.1;
}
.kpi-card-perf .unit {
    font-size: 1rem;
    font-weight: 500;
    color: var(--perf-text-body);
    margin-left: 4px;
}

/* --- Main Grid Layout --- */
.performance-grid-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    flex-grow: 1;
    min-height: 0; /* Important for flexbox children to scroll */
}
@media (min-width: 1024px) {
    .performance-grid-layout {
        grid-template-columns: minmax(350px, 1.5fr) 3fr;
    }
}

/* --- Widgets --- */
.leaderboard-widget, .main-chart-widget {
    background-color: var(--perf-bg-widget);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 24px;
    display: flex;
    flex-direction: column;
    min-height: 0;
}
.widget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--perf-border);
}
.widget-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

/* --- Tables (Leaderboard & Drilldown) --- */
.performance-table-container, .drilldown-table-wrapper {
    overflow-y: auto;
    flex-grow: 1;
}
.performance-table {
    width: 100%;
    border-collapse: collapse;
}
.performance-table th, .performance-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--perf-border);
    font-size: var(--font-size-sm);
    vertical-align: middle;
}
.performance-table th {
    font-weight: 600;
    color: var(--perf-text-body);
    position: sticky;
    top: 0;
    background-color: var(--perf-bg-widget);
    z-index: 1;
}
.performance-table tbody tr {
    transition: background-color var(--transition-fast);
    cursor: pointer;
}
.performance-table tbody tr:hover {
    background-color: var(--bg-tertiary);
}
.performance-table tbody tr.selected {
    background-color: var(--accent-primary-light);
    box-shadow: inset 4px 0 0 0 var(--perf-accent-1);
}
.rank-cell {
    font-weight: 700;
    font-size: 1.1em;
    width: 60px;
    text-align: center;
}
.medal { font-size: 1.3em; }
.name-cell { font-weight: 600; color: var(--perf-text-header); }
.metric-cell { font-family: var(--font-monospace); text-align: right; font-weight: 600; }
#drilldown-empty-state { text-align: center; padding: 20px; font-style: italic; color: var(--text-placeholder); }

/* --- Main Chart & Drilldown --- */
.main-chart-container {
    height: 250px;
    margin-bottom: 24px;
}
.shipment-drilldown-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}