/* Interactive wave chart (```wavechart blocks, rendered by wavechart.js and
   loaded by build.py only on posts that use one).
   Tier colors are categorical slots 1-4, validated for colorblind separation;
   dark mode gets its own steps of the same hues. */
.wavechart {
    --wave-0: #2a78d6;
    --wave-1: #eb6834;
    --wave-2: #1baf7a;
    --wave-3: #eda100;
    margin: 1.8em 0;
    user-select: none;
    -webkit-user-select: none;
}

[data-theme="dark"] .wavechart {
    --wave-0: #3987e5;
    --wave-1: #d95926;
    --wave-2: #199e70;
    --wave-3: #c98500;
}

.wavechart .wc-tier-0 { --wave: var(--wave-0); }
.wavechart .wc-tier-1 { --wave: var(--wave-1); }
.wavechart .wc-tier-2 { --wave: var(--wave-2); }
.wavechart .wc-tier-3 { --wave: var(--wave-3); }

.wc-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 18px;
    font-size: 0.85em;
    color: var(--text-muted-2);
    margin-bottom: 8px;
}

.wc-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.wc-swatch {
    width: 14px;
    height: 3px;
    border-radius: 2px;
    background: var(--wave);
}

.wc-legend-value {
    color: var(--text);
    font-variant-numeric: tabular-nums;
    min-width: 1.6em;
}

.wc-chart svg {
    display: block;
    overflow: visible;
    touch-action: pan-y;
    font-family: inherit;
}

.wc-chart svg:focus { outline: none; }
.wc-chart svg:focus-visible { outline: 1px dotted var(--text-muted); outline-offset: 4px; }

.wc-grid { stroke: var(--border); stroke-width: 1; }
.wc-baseline { stroke: var(--border-strong); stroke-width: 1; }
.wc-axis-label { fill: var(--text-muted); font-size: 11px; }

.wc-future { fill: var(--code-bg); opacity: 0.6; }
.wc-today { stroke: var(--text-muted); stroke-width: 1; stroke-dasharray: 2 3; }
.wc-today-label { fill: var(--text-muted); font-size: 11px; font-style: italic; }
.wavechart .wc-shared { --wave: var(--text-muted); }

.wc-series { transition: opacity 0.25s ease; }
.wc-series.wc-dim { opacity: 0.22; }
.wc-line {
    fill: none;
    stroke: var(--wave);
    stroke-width: 2;
    stroke-linejoin: round;
    stroke-linecap: round;
}
.wc-projected { stroke-dasharray: 5 4; }

.wc-hit { fill: transparent; cursor: ew-resize; }
.wc-cross { pointer-events: none; }
.wc-hair { stroke: var(--text-muted); stroke-width: 1; }
.wc-dot {
    fill: var(--wave);
    stroke: var(--bg);
    stroke-width: 2;
    transition: opacity 0.25s ease;
}
.wc-dot.wc-dim { opacity: 0.25; }

.wc-marker {
    fill: var(--bg);
    stroke: var(--text-muted);
    stroke-width: 1.5;
    cursor: pointer;
}
.wc-marker:hover,
.wc-marker.wc-active { fill: var(--text); stroke: var(--text); }

.wc-note {
    min-height: 8.5em;
    margin-top: 10px;
    padding: 10px 14px;
    border-left: 3px solid var(--blockquote-border);
    transition: border-color 0.3s ease;
}

.wc-note-date {
    font-size: 0.8em;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.wc-note-title {
    font-weight: bold;
    margin: 2px 0 4px;
}

.wc-note-text {
    margin: 0;
    font-size: 0.95em;
    line-height: 1.55;
    color: var(--text-muted-2);
}

.wc-caption {
    margin-top: 10px;
    font-size: 0.8em;
    font-style: italic;
    color: var(--text-muted);
}