:root {
    --color-bg: #0a0a0f;
    --color-text: #e0e0e0;
    --color-accent: #60a5fa;
    --color-accent-dark: #2563eb;
    --color-description: #c8cdd3;
    --color-date-dim: #1a1a2e;
    --color-graph-value: #f59e0b;
    --description-font-size: 1rem;
    --description-padding: 1rem;
    --description-line-gap: 0.5rem;
    --slider-gap: 1.4rem;
    --slider-track-opacity: 20%;
    --chart-height: 80px;
    --version-gap: 0.4rem;
    --version-font-size: 1.6rem;
    --gallery-frame-margin-y: 1rem;
    --version-inactive-opacity: 0.7;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: sans-serif;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem 0;
    overflow: hidden;
}

h1 {
    flex: 0 0 auto;
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    color: #9ca3af;
}

.container {
    width: 100%;
    flex: 0 1 auto;
    min-height: 0;
    display: grid;
    grid-template-columns: 15fr 70fr 15fr;
    grid-template-rows: minmax(0, 1fr) auto;
    row-gap: var(--slider-gap);
}

.side-column {
    min-width: 0;
    min-height: 0;
}

#versions-column {
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--version-gap);
}

.version-item {
    display: block;
    width: max-content;
    max-width: 100%;
    font: inherit;
    font-size: var(--version-font-size);
    text-align: center;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    line-height: 1.15;
    cursor: pointer;
    transition: color 0.05s, opacity 0.05s;
    margin: 0;
    padding: 0.15em 0.35em;
    border: none;
    background: transparent;
    color: inherit;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    touch-action: manipulation;
}

.version-item:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

#versions-column .version-item {
    --highlight: 0;
    color: color-mix(in srgb, var(--color-accent) calc(var(--highlight) * 100%), var(--color-date-dim));
    opacity: calc(var(--version-inactive-opacity) + (1 - var(--version-inactive-opacity)) * var(--highlight));
}

.version-item.active {
    color: var(--color-accent);
    opacity: 1;
}

#description-column {
    position: relative;
    min-height: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.text-layer {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    padding: var(--description-padding);
    opacity: var(--vis, 0);
}

.text-layer p {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--description-line-gap);
    font-size: var(--description-font-size);
    line-height: 1.5;
    color: var(--color-description);
}

.text-layer p .description-line {
    display: block;
}

.text-layer p strong {
    font-weight: 600;
    color: var(--color-text);
}

.text-layer p a.commit-link {
    color: inherit;
    text-decoration: none;
    cursor: pointer;
}

.text-layer p a.commit-link:hover {
    text-decoration: underline;
}

#gallery-frame {
    position: relative;
    display: grid;
    grid-template: 1fr / 1fr;
    justify-items: center;
    align-items: start;
    width: 100%;
    min-width: 0;
    min-height: 0;
    height: calc(100% - 2 * var(--gallery-frame-margin-y));
    margin: var(--gallery-frame-margin-y) 0;
    justify-self: stretch;
    align-self: stretch;
    overflow: hidden;
    background: var(--color-bg);
}

#gallery-frame img {
    grid-area: 1 / 1;
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    object-position: top center;
    opacity: var(--vis, 0);
    transition: opacity 0.05s linear;
    will-change: opacity;
    pointer-events: none;
}

.slider-left-spacer {
    align-self: start;
}

#slider-track {
    position: relative;
    align-self: start;
    height: var(--chart-height);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    cursor: pointer;
}

#slider-chart {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

#chart-area {
    fill: color-mix(in srgb, var(--color-accent) 12%, transparent);
    stroke: none;
}

#chart-line {
    fill: none;
    stroke: color-mix(in srgb, var(--color-accent) 30%, transparent);
    stroke-width: 1.5;
}

#slider-tooltip {
    position: absolute;
    top: 0;
    padding: 0.2rem 0.5rem;
    background: #1e293b;
    color: var(--color-accent);
    font-size: 0.8rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transform: translateX(-50%);
    white-space: nowrap;
}

#slider-track:hover #slider-tooltip {
    opacity: 1;
}

.slider-info {
    align-self: start;
    display: flex;
    justify-content: center;
    width: 100%;
    padding: 0 0.5rem;
}

#graph-info-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    cursor: default;
}

#graph-info-value {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    text-align: center;
    line-height: 1;
}

#graph-info-size {
    font-size: 3rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--color-graph-value);
}

#graph-info-unit {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-graph-value);
    letter-spacing: 0.04em;
    line-height: 1;
    text-transform: lowercase;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(90deg,
        color-mix(in srgb, #1e293b var(--slider-track-opacity, 40%), transparent),
        color-mix(in srgb, #334155 var(--slider-track-opacity, 40%), transparent));
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, var(--color-accent), var(--color-accent-dark));
    border: 2px solid #1e3a5f;
    box-shadow: 0 0 12px color-mix(in srgb, var(--color-accent-dark) 50%, transparent);
    transition: box-shadow 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    box-shadow: 0 0 20px color-mix(in srgb, var(--color-accent) 70%, transparent);
}

input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, var(--color-accent), var(--color-accent-dark));
    border: 2px solid #1e3a5f;
    box-shadow: 0 0 12px color-mix(in srgb, var(--color-accent-dark) 50%, transparent);
    cursor: pointer;
}