:root {
    --background: #0b100e;
    --foreground: #e9f1ed;
    --muted: #7f8c86;
    --border: #28332f;
    --grid: rgba(127, 140, 134, 0.14);
    --series: #bdff36;
    --series-post: #69c8ff;
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

html,
body {
    min-width: 320px;
    min-height: 100%;
}

body {
    display: grid;
    place-items: center;
    min-height: 100vh;
    margin: 0;
    background: var(--background);
    color: var(--foreground);
    font-family: var(--sans);
}

.tcp-lab {
    display: grid;
    gap: 22px;
    width: min(1120px, 100%);
    padding: clamp(28px, 6vw, 72px) clamp(18px, 5vw, 56px);
}

.chart-footer {
    margin-inline: 78px 18px;
}

.ping-picker {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
}

.ping-picker > span {
    color: var(--muted);
    font: 500 13px/1 var(--sans);
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.ping-picker output {
    color: var(--series);
    font: 500 15px/1 var(--mono);
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.ping-picker input {
    min-width: 0;
    width: 100%;
    height: 4px;
    appearance: none;
    border: 0;
    border-radius: 0;
    background: linear-gradient(
        90deg,
        var(--series) 0 var(--range-progress, 10.4%),
        var(--border) var(--range-progress, 10.4%) 100%
    );
    cursor: pointer;
}

.ping-picker input::-webkit-slider-thumb {
    width: 12px;
    height: 20px;
    appearance: none;
    border: 0;
    border-radius: 0;
    background: var(--series);
}

.ping-picker input::-moz-range-thumb {
    width: 12px;
    height: 20px;
    border: 0;
    border-radius: 0;
    background: var(--series);
}

.ping-picker input:focus-visible {
    outline: 2px solid var(--foreground);
    outline-offset: 6px;
}

.rtt-formula {
    display: flex;
    flex-wrap: wrap;
    gap: 5px 8px;
    align-items: baseline;
    margin-top: 18px;
    color: var(--muted);
    font: 400 12px/1.5 var(--mono);
}

.rtt-formula .formula-name,
.rtt-formula > span:nth-child(2) {
    color: var(--foreground);
    font-weight: 500;
}

.rtt-formula i {
    font-family: Georgia, serif;
}

.throughput-figure {
    min-width: 0;
    margin: 0;
}

#throughput-chart {
    display: block;
    width: 100%;
    min-height: 500px;
    overflow: visible;
}

.chart-frame,
.chart-grid,
.chart-guide,
.chart-line,
.chart-legend-line {
    vector-effect: non-scaling-stroke;
}

.chart-frame {
    fill: none;
    stroke: var(--border);
}

.chart-grid {
    stroke: var(--grid);
}

.chart-axis,
.chart-axis-title,
.chart-point-label,
.chart-legend {
    font-family: var(--mono);
    font-size: 11px;
}

.chart-axis,
.chart-axis-title {
    fill: var(--muted);
}

.chart-axis-title {
    letter-spacing: 0.06em;
}

.chart-line {
    fill: none;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.chart-line-tcp,
.chart-legend-line-tcp {
    stroke: var(--series);
}

.chart-line-post,
.chart-legend-line-post {
    stroke: var(--series-post);
}

.chart-legend-line {
    stroke-width: 3;
}

.chart-legend text {
    fill: var(--muted);
}

.chart-guide {
    stroke: var(--series);
    stroke-width: 1;
    opacity: 0.6;
}

.chart-marker {
    fill: var(--background);
    stroke-width: 3;
    vector-effect: non-scaling-stroke;
}

.chart-marker-tcp {
    stroke: var(--series);
}

.chart-marker-post {
    stroke: var(--series-post);
}

.chart-point-label {
    fill: var(--foreground);
}

.chart-point-label-post {
    fill: var(--series-post);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 520px) {
    .tcp-lab {
        gap: 18px;
    }

    .chart-footer {
        margin-inline: 58px 8px;
    }

    .ping-picker {
        gap: 10px;
    }

    #throughput-chart {
        min-height: 360px;
    }
}