:root {
    --teal: #8b5cf6;
    --teal-dark: #6d28d9;
    --yellow: #d946ef;
    --slate: #5b4e6c;
    --ink: #241f33;
    --muted: #776d8a;
    --line: #e2dcf0;
    --bg: #f5f2fb;
    --card: #ffffff;
    --danger: #b3261e;
    /* Chart series. Checked with the palette validator against both card
       surfaces: lightness band, chroma, colour-blind separation, contrast. */
    --viz-1: #7c3aed;
    --viz-2: #c026d3;
    --viz-grid: #e8e1f7;
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root {
        --ink: #ece7f7;
        --muted: #ab9fc4;
        --line: #3a3155;
        --bg: #15101f;
        --card: #1e1830;
        --slate: #cdc2e3;
        --danger: #f2b8b5;
        --viz-grid: #2f2748;
        color-scheme: dark;
    }
}

* { box-sizing: border-box; }

/* Elements with display rules of their own (the filter form is a flex box)
   would otherwise ignore the hidden attribute. */
[hidden] { display: none !important; }

.visually-hidden {
    position: absolute; width: 1px; height: 1px; overflow: hidden;
    clip: rect(0 0 0 0); white-space: nowrap;
}

body {
    margin: 0;
    font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color: var(--ink);
    /* Something for the glass to refract: drifting violet/magenta washes,
       like light pooling under liquid glass. */
    background:
        radial-gradient(1000px 650px at 10% -10%, color-mix(in srgb, var(--teal) 30%, transparent), transparent 70%),
        radial-gradient(900px 600px at 100% 0%, color-mix(in srgb, var(--yellow) 22%, transparent), transparent 65%),
        radial-gradient(800px 700px at 50% 110%, color-mix(in srgb, var(--viz-1) 16%, transparent), transparent 70%),
        var(--bg);
    background-attachment: fixed;
}

/* Frosted panels: translucent surface, deeply blurred backdrop, a bright
   specular hairline along the top edge, and a soft tinted shadow underneath -
   the liquid-glass look of light bending through a curved, lit surface. */
.glass,
.filters,
.tile,
.gate,
article {
    background:
        linear-gradient(165deg, color-mix(in srgb, #fff 20%, transparent), transparent 40%),
        color-mix(in srgb, var(--card) 68%, transparent);
    backdrop-filter: blur(28px) saturate(170%);
    -webkit-backdrop-filter: blur(28px) saturate(170%);
    border: 1px solid color-mix(in srgb, #fff 40%, var(--line) 60%);
    box-shadow:
        inset 0 1px 1px color-mix(in srgb, #fff 65%, transparent),
        inset 0 -1px 0 color-mix(in srgb, var(--teal) 12%, transparent),
        0 14px 36px color-mix(in srgb, var(--teal-dark) 14%, transparent),
        0 2px 8px rgba(36, 10, 60, 0.08);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .glass,
    :root:not([data-theme="light"]) .filters,
    :root:not([data-theme="light"]) .tile,
    :root:not([data-theme="light"]) .gate,
    :root:not([data-theme="light"]) article {
        background:
            linear-gradient(165deg, color-mix(in srgb, #fff 8%, transparent), transparent 45%),
            color-mix(in srgb, var(--card) 60%, transparent);
        border-color: color-mix(in srgb, #fff 14%, var(--teal) 10%);
        box-shadow:
            inset 0 1px 1px color-mix(in srgb, #fff 12%, transparent),
            inset 0 -1px 0 color-mix(in srgb, #000 20%, transparent),
            0 16px 40px rgba(0, 0, 0, 0.5),
            0 0 40px color-mix(in srgb, var(--teal) 10%, transparent);
    }
}

@supports not (backdrop-filter: blur(1px)) {
    .glass, .filters, .tile, .gate, article { background: var(--card); }
}

.top {
    background:
        linear-gradient(165deg, color-mix(in srgb, #fff 18%, transparent), transparent 50%),
        color-mix(in srgb, var(--card) 76%, transparent);
    backdrop-filter: blur(28px) saturate(170%);
    -webkit-backdrop-filter: blur(28px) saturate(170%);
    position: sticky;
    top: 0;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding: 14px 24px;
    border-bottom: 1px solid color-mix(in srgb, #fff 40%, var(--line) 60%);
    box-shadow: 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .top {
        background:
            linear-gradient(165deg, color-mix(in srgb, #fff 7%, transparent), transparent 55%),
            color-mix(in srgb, var(--card) 68%, transparent);
        border-bottom-color: color-mix(in srgb, #fff 12%, var(--teal) 10%);
        box-shadow: 0 1px 0 color-mix(in srgb, #fff 8%, transparent);
    }
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { margin: 0; font-size: 18px; font-weight: 600; color: var(--slate); }
.bar { display: flex; width: 28px; height: 6px; }
.bar i:first-child { flex: 1; background: var(--teal); }
.bar i:last-child { flex: 1; background: var(--yellow); }
.who { color: var(--muted); font-size: 14px; }

a { color: var(--teal-dark); }
@media (prefers-color-scheme: dark) { a { color: var(--teal); } }

main { max-width: 1200px; margin: 0 auto; padding: 20px 24px 48px; }
main.narrow { max-width: 560px; padding-top: 64px; }

.filters {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 12px;
    padding: 16px;
    border-radius: 14px;
}

.filters label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.quick { display: flex; gap: 6px; }

input, select, button, .button {
    font: inherit;
    padding: 7px 10px;
    border: 1px solid color-mix(in srgb, #fff 30%, var(--line) 70%);
    border-radius: 999px;
    background: color-mix(in srgb, var(--card) 70%, transparent);
    backdrop-filter: blur(10px) saturate(150%);
    -webkit-backdrop-filter: blur(10px) saturate(150%);
    color: var(--ink);
}

button, .button { cursor: pointer; text-decoration: none; display: inline-block; }
button:hover, .button:hover { border-color: var(--teal); }
button.primary {
    background: linear-gradient(165deg, color-mix(in srgb, #fff 25%, var(--teal)), var(--teal-dark));
    border-color: var(--teal-dark);
    color: #fff;
    box-shadow:
        inset 0 1px 0 color-mix(in srgb, #fff 45%, transparent),
        0 6px 18px color-mix(in srgb, var(--teal-dark) 40%, transparent);
}

.status { min-height: 1.4em; color: var(--muted); }
.range { color: var(--muted); margin: 0 0 12px; }

.tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.tile {
    display: flex;
    flex-direction: column;
    padding: 14px 16px;
    border-top: 3px solid var(--teal);
    border-radius: 12px;
}

.tile:nth-child(even) { border-top-color: var(--yellow); }
.tile .n { font-size: 30px; font-weight: 650; font-variant-numeric: tabular-nums; }
.tile .l { color: var(--slate); font-weight: 500; }
.tile .s { color: var(--muted); font-size: 13px; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 16px;
}

article {
    padding: 16px 18px;
    border-radius: 14px;
    overflow-x: auto;
}

h2 { margin: 0 0 8px; font-size: 16px; color: var(--slate); }
h2 small { font-weight: 400; color: var(--muted); }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 6px 4px; border-bottom: 1px solid var(--line); text-align: left; }
th { font-size: 13px; color: var(--muted); font-weight: 500; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
td.empty { color: var(--muted); font-style: italic; }

.exports { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }

@media (max-width: 600px) {
    .top, main { padding-left: 16px; padding-right: 16px; }
    .grid { grid-template-columns: 1fr; }
}

.gate {
    max-width: 480px;
    margin: 48px auto;
    padding: 28px;
    border-top: 3px solid var(--teal);
    border-radius: 16px;
}

.gate h2 { font-size: 20px; }
.code-form { display: flex; gap: 8px; margin: 16px 0 8px; }
.code-form input { flex: 1; min-width: 0; font-size: 18px; letter-spacing: 0.08em; text-transform: uppercase; }
.error { color: var(--danger); min-height: 1.4em; margin: 0; }
.muted { color: var(--muted); font-size: 14px; }

/* Charts ------------------------------------------------------------- */

.charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.charts .wide { grid-column: 1 / -1; }

.chart-wrap { position: relative; }

.chart {
    width: 100%;
    height: auto;
    display: block;
    overflow: visible;
    --series: var(--viz-1);
    color: var(--series);           /* gradient stops use currentColor */
}

.chart.series-2 { --series: var(--viz-2); }
.chart:focus-visible { outline: 2px solid var(--series); outline-offset: 4px; }

.grid { stroke: var(--viz-grid); stroke-width: 1; }
/* A soft glow on the line and marks - light coming off the data, not extra ink. */
.line {
    fill: none;
    stroke: var(--series);
    stroke-width: 2;
    stroke-linejoin: round;
    stroke-linecap: round;
    filter: drop-shadow(0 0 6px color-mix(in srgb, var(--series) 45%, transparent));
}

.area { fill: var(--series); }
.bar { fill: var(--series); filter: drop-shadow(0 1px 6px color-mix(in srgb, var(--series) 30%, transparent)); }
/* Surface ring keeps markers legible where they cross the line. */
.marker { fill: var(--series); stroke: var(--card); stroke-width: 2; }
.marker-active { stroke-width: 2; }
.crosshair { stroke: var(--muted); stroke-width: 1; }
.hit { fill: transparent; cursor: pointer; }
.hit:hover ~ .bar, .hit:focus { outline: none; }

.tick { fill: var(--muted); font-size: 12px; font-family: inherit; }
.tick-y, .tick-value { font-variant-numeric: tabular-nums; }
.tick-value { fill: var(--ink); font-weight: 600; }
.tick-name { fill: var(--slate); }

.empty-chart { color: var(--muted); font-style: italic; margin: 24px 0; }

.chart-tip {
    position: absolute;
    pointer-events: none;
    background: color-mix(in srgb, var(--card) 88%, transparent);
    backdrop-filter: blur(12px) saturate(140%);
    -webkit-backdrop-filter: blur(12px) saturate(140%);
    border: 1px solid var(--line);
    border-left: 3px solid var(--series, var(--viz-1));
    border-radius: 8px;
    padding: 6px 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    line-height: 1.25;
    white-space: nowrap;
    z-index: 2;
}

.chart-tip strong { font-size: 15px; font-variant-numeric: tabular-nums; }
.chart-tip span { color: var(--muted); font-size: 12px; }