/* ─────────────────────────────────────────────
   Charts — ChartFrame component, card stack, drawer
   ───────────────────────────────────────────── */

/* ── ChartFrame container ── */
.chart-frame {
    container-type: inline-size;
    container-name: chart;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    overflow: hidden;
    position: relative;
    transition: background-color var(--duration-slow) var(--ease-in-out),
                border-color var(--duration-slow) var(--ease-in-out);
}

/* ── Header bar ── */
.chart-frame__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--border-subtle);
    min-height: 36px;
}

.chart-frame__title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.chart-frame__actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.chart-frame__action {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out),
                background var(--duration-fast) var(--ease-out);
}

.chart-frame__action:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

/* ── Canvas area ── */
.chart-frame__body {
    flex: 1;
    position: relative;
    min-height: 200px;
}

.chart-frame__body canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* ── States ── */

/* Loading: shimmer skeleton */
.chart-frame--loading .chart-frame__body::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
        var(--bg-secondary) 0%,
        var(--bg-hover) 40%,
        var(--bg-secondary) 80%);
    background-size: 200% 100%;
    animation: shimmer 1.5s var(--ease-linear) infinite;
    z-index: var(--z-base);
}

/* Empty: centered message */
.chart-frame--empty .chart-frame__body::after {
    content: attr(data-empty-message);
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* Error: red tint + retry */
.chart-frame--error {
    border-color: var(--danger-dim);
}

.chart-frame--error .chart-frame__body::after {
    content: attr(data-error-message);
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--danger);
    font-size: var(--font-size-sm);
    background: var(--danger-dim);
}

/* ── Legend (inside chart) ── */
.chart-frame .chart-legend {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    border-top: 1px solid var(--border-subtle);
    flex-wrap: wrap;
}

.chart-legend__item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.chart-legend__swatch {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ── Container queries: auto-hide at small sizes ── */
@container chart (max-width: 400px) {
    .chart-frame .chart-legend {
        display: none;
    }
    .chart-frame__header {
        padding: var(--space-1) var(--space-2);
    }
}

@container chart (max-width: 300px) {
    .chart-frame .chart-axis-y {
        display: none;
    }
}

/* ── Mobile card stack ── */
@media (max-width: 767px) {
    .chart-stack {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 0;
        scroll-padding: 0;
    }

    .chart-stack > .chart-frame {
        flex: 0 0 100%;
        scroll-snap-align: start;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    .chart-stack > .chart-frame + .chart-frame {
        border-top: none;
    }
}

/* Desktop grid */
@media (min-width: 768px) {
    .chart-stack {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: var(--space-3);
    }
}

/* ── Dot navigation (mobile card position indicator) ── */
.chart-dot-nav {
    display: none;
    justify-content: center;
    gap: 6px;
    padding: var(--space-2) 0;
}

@media (max-width: 767px) {
    .chart-dot-nav {
        display: flex;
    }
}

.chart-dot-nav__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: background var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out);
}

.chart-dot-nav__dot.active {
    background: var(--accent);
    transform: scale(1.3);
}

/* ── Bottom drawer (mobile tooltip) ── */
.chart-drawer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: var(--shadow-lg);
    max-height: 40vh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-overlay);
    padding: var(--space-3) var(--space-4);
}

.chart-drawer.open {
    transform: translateY(0);
}

.chart-drawer__handle {
    width: 32px;
    height: 4px;
    background: var(--border);
    border-radius: var(--radius-pill);
    margin: 0 auto var(--space-2);
}

.chart-drawer__backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: calc(var(--z-overlay) - 1);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-slow) var(--ease-out);
}

.chart-drawer__backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

/* ── ChartFrame sizes ── */
.chart-frame--compact .chart-frame__body {
    min-height: 150px;
}

.chart-frame--tall .chart-frame__body {
    min-height: 350px;
}

/* ── Fullscreen mode ── */
.chart-frame--fullscreen {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    border-radius: 0;
    border: none;
}