style.css

:root {
    --abyss: oklch(2.5% 0.005 260);
    --surface: oklch(7% 0.008 260);
    --surface-raised: oklch(10% 0.01 260);
    --seafoam: oklch(68% 0.14 195);
    --nebula: oklch(52% 0.22 285);
    --ember: oklch(72% 0.16 65);
    --ice: oklch(96% 0.003 255);
    --mist: oklch(65% 0.015 255);
    --frost: oklch(45% 0.015 255);
    --border: oklch(20% 0.01 260 / 0.4);
    --border-hover: oklch(35% 0.02 260 / 0.5);
    --error-bg: oklch(20% 0.08 25 / 0.3);
    --error-text: oklch(70% 0.12 25);
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
    --text-xs: 0.65rem;
    --text-sm: 0.85rem;
    --weight-semibold: 600;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 4rem;
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;
    --ease-out-quart: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
    --duration-instant: 150ms;
    --duration-short: 200ms;
    --duration-medium: 400ms;
    --duration-long: 800ms;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    -webkit-clip-path: inset(50%);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

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

body {
    background-color: var(--abyss);
    color: var(--ice);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
    overflow-x: hidden;
    min-height: 100vh;
}

.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.05;
    z-index: 1000;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xxl) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.hero {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.author-badge {
    display: inline-block;
    padding: 0.4rem 0.9rem;
    background: oklch(100% 0 0 / 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--mist);
    cursor: default;
    transition: background var(--duration-short) var(--ease-out-quart),
        border-color var(--duration-short) var(--ease-out-quart),
        color var(--duration-short) var(--ease-out-quart),
        transform var(--duration-short) var(--ease-out-quart);
}

.author-badge:hover {
    background: oklch(100% 0 0 / 0.06);
    border-color: var(--border-hover);
    color: var(--ice);
    transform: translateY(-1px);
}

.title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin: 0;
    color: var(--ice);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--mist);
    max-width: 600px;
}

.selector-pill {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-xs);
    background: oklch(100% 0 0 / 0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
}

.controls-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    width: 100%;
}

.settings-row {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.settings-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.control-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--mist);
    opacity: 0.8;
}

.selector-pill.small {
    padding: 0.25rem;
    gap: 0.25rem;
    border-radius: var(--radius-md);
}

.repo-btn,
.mode-btn,
.scale-btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    color: var(--mist);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    cursor: pointer;
    transition: color var(--duration-instant) var(--ease-out-quart),
        background-color var(--duration-instant) var(--ease-out-quart),
        transform var(--duration-instant) var(--ease-out-quart);
}

.mode-btn,
.scale-btn {
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.repo-btn:hover,
.mode-btn:hover,
.scale-btn:hover {
    color: var(--ice);
    transform: translateY(-1px);
}

.repo-btn:active,
.mode-btn:active,
.scale-btn:active {
    transform: scale(0.97);
}

.repo-btn:focus-visible,
.mode-btn:focus-visible,
.scale-btn:focus-visible {
    outline: 2px solid var(--seafoam);
    outline-offset: 2px;
}

.repo-btn.active,
.mode-btn.active,
.scale-btn.active {
    background: var(--seafoam);
    color: var(--abyss);
    font-weight: 600;
}

.repo-description {
    font-style: italic;
    font-size: 0.9rem;
    color: var(--mist);
    margin-top: var(--space-xs);
}

.surface-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
    transition: border-color var(--duration-short) var(--ease-out-quart);
}

.surface-panel:hover {
    border-color: var(--border-hover);
}

.visualization-canvas {
    min-height: 700px;
    display: flex;
    flex-direction: column;
    padding-bottom: var(--space-xl);
    position: relative;
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

.skeleton-loading-overlay {
    position: absolute;
    inset: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.5rem 1rem 1rem;
    background: transparent;
    pointer-events: auto;
}

.skeleton-loading-overlay > * {
    pointer-events: none;
}

.skeleton-pill,
.skeleton-tick,
.skeleton-wave {
    background: linear-gradient(
        90deg,
        oklch(100% 0 0 / 0.04) 0%,
        oklch(100% 0 0 / 0.10) 40%,
        oklch(68% 0.14 195 / 0.08) 55%,
        oklch(100% 0 0 / 0.04) 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 1.8s infinite linear;
    border-radius: var(--radius-full);
}

.skeleton-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid oklch(100% 0 0 / 0.04);
}

.skeleton-pill {
    height: 14px;
    border-radius: var(--radius-full);
}

.skeleton-pill:nth-child(1) { width: 60px; animation-delay: 0s; }
.skeleton-pill:nth-child(2) { width: 80px; animation-delay: 0.15s; }
.skeleton-pill:nth-child(3) { width: 70px; animation-delay: 0.3s; }
.skeleton-pill:nth-child(4) { width: 65px; animation-delay: 0.45s; }

.skeleton-chart {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.skeleton-chart-inner {
    flex: 1;
    display: flex;
    gap: 0.75rem;
    min-height: 400px;
}

.skeleton-y-axis {
    width: 40px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-end;
    padding: 0.25rem 0;
}

.skeleton-tick {
    height: 10px;
    border-radius: 4px;
}

.skeleton-y-axis .skeleton-tick { width: 32px; }
.skeleton-y-axis .skeleton-tick:nth-child(1) { animation-delay: 0s; }
.skeleton-y-axis .skeleton-tick:nth-child(2) { animation-delay: 0.1s; }
.skeleton-y-axis .skeleton-tick:nth-child(3) { animation-delay: 0.2s; }
.skeleton-y-axis .skeleton-tick:nth-child(4) { animation-delay: 0.3s; }
.skeleton-y-axis .skeleton-tick:nth-child(5) { animation-delay: 0.4s; }

.skeleton-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 0;
    border-radius: 0.75rem;
    overflow: hidden;
    position: relative;
}

.skeleton-wave {
    border-radius: 0;
    animation-timing-function: var(--ease-out-quart);
}

.skeleton-wave.wave-1 { flex: 2; animation-delay: 0.05s; opacity: 0.8; }
.skeleton-wave.wave-2 { flex: 3; animation-delay: 0.2s; opacity: 0.6; }
.skeleton-wave.wave-3 { flex: 4; animation-delay: 0.35s; opacity: 0.4; }

.skeleton-x-axis {
    display: flex;
    justify-content: space-between;
    padding: 0 44px 0 48px;
}

.skeleton-x-axis .skeleton-tick.short {
    width: 30px;
    height: 10px;
}

.skeleton-x-axis .skeleton-tick:nth-child(1) { animation-delay: 0s; }
.skeleton-x-axis .skeleton-tick:nth-child(2) { animation-delay: 0.1s; }
.skeleton-x-axis .skeleton-tick:nth-child(3) { animation-delay: 0.2s; }
.skeleton-x-axis .skeleton-tick:nth-child(4) { animation-delay: 0.3s; }
.skeleton-x-axis .skeleton-tick:nth-child(5) { animation-delay: 0.4s; }
.skeleton-x-axis .skeleton-tick:nth-child(6) { animation-delay: 0.5s; }

@keyframes pulse {
    0% { opacity: 0.3; }
    50% { opacity: 0.8; }
    100% { opacity: 0.3; }
}

@keyframes error-slide {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.error-banner {
    background: var(--error-bg);
    color: var(--error-text);
    border: 1px solid oklch(20% 0.08 25 / 0.4);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-sm);
    text-align: center;
    animation: error-slide var(--duration-short) var(--ease-out-quart) both;
}

.hidden {
    display: none;
}

.chart-wrapper {
    flex: 1;
    width: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
}

svg#main-chart {
    width: 100%;
    flex: 1;
    min-height: 550px;
}

svg#main-chart rect[tabindex="0"]:focus {
    outline: 2px solid var(--seafoam);
    outline-offset: -2px;
}

.custom-tooltip {
    position: absolute;
    pointer-events: none;
    background: var(--abyss);
    border: 1px solid var(--border);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    z-index: 100;
    min-width: 340px;
    max-width: min(340px, 90vw);
    overflow-wrap: break-word;
    box-shadow: 0 30px 60px oklch(0% 0 0 / 0.8);
    opacity: 0;
    visibility: hidden;
    transform: scale(0.96);
    transform-origin: top left;
    transition: opacity var(--duration-short) var(--ease-out-quart),
        transform var(--duration-short) var(--ease-out-quart),
        visibility 0s var(--duration-short);
}

.custom-tooltip.hidden {
    display: block;
}

.custom-tooltip:not(.hidden) {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
    transition-delay: 0s;
}

.milestone-banner {
    border: 1px solid oklch(52% 0.22 285 / 0.3);
    border-radius: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    margin-bottom: 1rem;
}

.milestone-title {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--ice);
    margin-bottom: 0.2rem;
}

.milestone-desc {
    font-size: 0.7rem;
    color: var(--mist);
    line-height: 1.4;
}

.milestone-marker text {
    transition: all var(--duration-short) var(--ease-out-quart);
}

.milestone-marker:hover text {
    filter: drop-shadow(0 0 8px oklch(68% 0.14 195 / 0.8));
}

.tooltip-header {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--frost);
    margin-bottom: 0.6rem;
}

.tooltip-total {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ice);
    margin-bottom: 0.75rem;
}

.tooltip-breakdown {
    border-top: 1px solid var(--border);
    padding-top: 0.6rem;
}

.tooltip-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    padding: 0.2rem 0;
}

.color-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.tooltip-row-label {
    color: var(--mist);
    margin-right: auto;
}

.tooltip-row-value {
    color: var(--ice);
    font-variant-numeric: tabular-nums;
}

.tooltip-row-pct {
    font-size: 0.7rem;
    color: var(--frost);
    min-width: 4.2ch;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.chart-legend {
    position: relative;
    display: flex;
    justify-content: center;
    padding: var(--space-xs) 0;
    margin-bottom: var(--space-md);
    border-bottom: 1px solid oklch(100% 0 0 / 0.05);
}

.legend-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--mist);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: color var(--duration-instant) var(--ease-out-quart),
        border-color var(--duration-instant) var(--ease-out-quart);
    -webkit-user-select: none;
    user-select: none;
}

.legend-trigger:hover,
.legend-trigger:focus-visible {
    color: var(--ice);
    border-color: var(--seafoam);
    outline: none;
}

.legend-trigger-icon {
    display: inline-block;
    width: 0.45rem;
    height: 0.45rem;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(-45deg);
    margin-top: -0.1rem;
    transition: transform var(--duration-short) var(--ease-out-quart);
}

.legend-trigger[aria-expanded="true"] .legend-trigger-icon {
    transform: rotate(45deg);
}

.legend-panel {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    padding: 1rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    z-index: 50;
    min-width: 200px;
    max-width: min(420px, 90vw);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-short) var(--ease-out-quart),
        visibility 0s var(--duration-short);
    box-shadow: 0 20px 50px oklch(0% 0 0 / 0.7);
}

.chart-legend:hover .legend-panel,
.chart-legend:focus-within .legend-panel {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.65rem;
    font-family: var(--font-mono);
    color: var(--mist);
    cursor: pointer;
    padding: 0.15rem 0;
    white-space: nowrap;
    transition: color var(--duration-instant) var(--ease-out-quart);
}

.legend-item:hover {
    color: var(--ice);
}

.legend-item .color-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    flex-shrink: 0;
}

@media (prefers-reduced-motion: reduce) {
    .legend-panel {
        transition: none;
    }
}

.legend-item:hover {
    color: var(--ice);
}

.insights-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    position: relative;
}

@media (min-width: 640px) {
    .insights-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .insights-grid {
        grid-template-columns: repeat(3, 1fr);
        z-index: 1;
    }

    #card-ancestry {
        grid-column: span 2;
    }
}

#card-ancestry .card-content-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    align-items: end;
}

.insight-card {
    padding: 2.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: transform var(--duration-medium) var(--ease-out-quint),
        border-color var(--duration-short) var(--ease-out-quart);
}

.insight-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-hover);
}

.card-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
    color: var(--mist);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.1rem;
    height: 1.1rem;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--mist);
    background: oklch(100% 0 0 / 0.08);
    border: 1px solid oklch(100% 0 0 / 0.15);
    border-radius: 50%;
    cursor: help;
    position: relative;
    flex-shrink: 0;
    transition: all var(--duration-short) var(--ease-out-quart);
    z-index: 10;
}

.help-icon:hover,
.help-icon:focus-visible {
    background: var(--seafoam);
    color: var(--abyss);
    border-color: var(--seafoam);
    outline: none;
}

.help-icon::after {
    content: attr(data-tooltip);
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translateX(-50%);
    margin-top: -100px;
    background: oklch(0% 0 0 / 0.95);
    border: 1px solid var(--border);
    color: var(--ice);
    padding: var(--space-xs) 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 400;
    text-transform: none;
    letter-spacing: normal;
    line-height: 1.4;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-short) var(--ease-out-quart);
    z-index: 10000;
    width: max-content;
    max-width: 300px;
    min-width: 180px;
    box-shadow: 0 10px 30px oklch(0% 0 0 / 0.5);
    text-align: center;
}

.help-icon:hover::after,
.help-icon:focus-visible::after {
    opacity: 1;
}

.metric-value {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-xs);
    color: var(--seafoam);
}

.metric-value.small {
    font-size: 2.2rem;
}

.metric-label {
    font-size: 0.9rem;
    color: var(--mist);
    line-height: 1.4;
}

.footer {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

.footer-text {
    font-size: 0.8rem;
    color: var(--mist);
}

.personal-narrative {
    width: 100%;
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    text-align: center;
}

.narrative-title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.8rem);
    font-weight: 500;
    color: var(--ice);
    cursor: pointer;
    user-select: none;
}

.narrative-title::-webkit-details-marker {
    color: var(--mist);
}

.narrative-title::marker {
    color: var(--mist);
    font-size: 0.8em;
}

.narrative-title:hover {
    opacity: 0.85;
}

.narrative-content {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--mist);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 75ch;
    margin: 1.5rem auto 0;
}

.narrative-content p {
    margin: 0;
}

.philosophy-link {
    color: var(--seafoam);
    text-decoration: none;
    border-bottom: 1px solid oklch(68% 0.14 195 / 0.3);
    transition: all var(--duration-short) var(--ease-out-quart);
}

.philosophy-link:hover {
    border-bottom-color: var(--seafoam);
    background: oklch(68% 0.14 195 / 0.05);
}

.signature {
    margin-top: 3.5rem;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.4rem;
    color: var(--ice);
    opacity: 0.9;
    line-height: 1.4;
}

.signature-subtitle {
    font-style: normal;
    font-size: 0.85rem;
    color: var(--mist);
    display: block;
    margin-top: var(--space-xs);
    letter-spacing: 0.05em;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--abyss);
}

::-webkit-scrollbar-thumb {
    background: oklch(100% 0 0 / 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: oklch(100% 0 0 / 0.2);
}

.fossil-finder {
    padding: var(--space-xl);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--ice);
    text-align: center;
}

.fossil-hint {
    text-align: center;
    font-size: 0.8rem;
    color: var(--mist);
    margin-bottom: 2.5rem;
    font-style: italic;
}

.fossil-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}

@media (min-width: 768px) {
    .fossil-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@keyframes fossil-enter {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fossil-card {
    background: oklch(100% 0 0 / 0.02);
    border: 1px solid oklch(100% 0 0 / 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-lg);
    position: relative;
    overflow: hidden;
    text-align: left;
    cursor: pointer;
    animation: fossil-enter var(--duration-medium) var(--ease-out-quint) both;
    transition: transform var(--duration-medium) var(--ease-out-quint),
        border-color var(--duration-short) var(--ease-out-quart),
        box-shadow var(--duration-medium) var(--ease-out-quint);
}

.fossil-card:nth-child(2) {
    animation-delay: 100ms;
}

.fossil-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at top left, oklch(68% 0.14 195 / 0.08), transparent 50%),
        radial-gradient(ellipse at bottom right, oklch(72% 0.16 65 / 0.08), transparent 50%);
    pointer-events: none;
    opacity: 0.6;
}

.fossil-card:hover {
    border-color: oklch(68% 0.14 195 / 0.3);
    box-shadow: 0 0 40px oklch(68% 0.14 195 / 0.1);
    transform: translateY(-4px);
}

.fossil-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.fossil-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--seafoam);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.fossil-label::after {
    content: '\2197';
    font-size: 0.7rem;
    opacity: 0;
    transition: opacity var(--duration-medium) var(--ease-out-quart);
}

.fossil-card:hover .fossil-label::after {
    opacity: 0.6;
}

.fossil-year {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ice);
    opacity: 0.8;
}

.fossil-meta {
    font-size: 0.8rem;
    color: var(--mist);
    margin-bottom: 1.25rem;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.fossil-link {
    color: var(--seafoam);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: oklch(68% 0.14 195 / 0.4);
    cursor: pointer;
    transition: all var(--duration-short) var(--ease-out-quart);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    background: oklch(68% 0.14 195 / 0.05);
    display: inline-block;
}

.fossil-link:hover {
    background: oklch(68% 0.14 195 / 0.15);
    text-decoration-color: oklch(68% 0.14 195 / 0.8);
}

.fossil-commit {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ember);
    background: oklch(72% 0.16 65 / 0.1);
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
}

.fossil-code {
    background: oklch(0% 0 0 / 0.4);
    border: 1px solid oklch(100% 0 0 / 0.08);
    border-radius: 0.75rem;
    padding: 0.6rem var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--ice);
    opacity: 0.8;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    text-align: left;
}

.fossil-code::before {
    content: '>';
    color: var(--seafoam);
    opacity: 0.5;
    flex-shrink: 0;
    display: inline;
}

.fossil-description {
    font-size: 0.75rem;
    font-style: italic;
    color: var(--mist);
    margin-top: 1.25rem;
    line-height: 1.5;
}

.repo-request {
    text-align: center;
    padding: var(--space-lg);
}

.repo-request-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: var(--weight-semibold);
    color: var(--ice);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.repo-request-icon {
    display: inline-block;
    font-size: var(--text-sm);
    color: var(--mist);
    opacity: 0.6;
    transition: color 0.4s var(--ease-out-quart),
        transform 0.6s var(--ease-out-quint);
}

.repo-request-title:hover .repo-request-icon {
    transform: rotate(-3deg);
}

.repo-request-desc {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--mist);
    margin-bottom: var(--space-md);
}

.repo-request-form {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.repo-request-field {
    position: relative;
}

.repo-request-input {
    padding: 0.6rem 1rem;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--ice);
    background: oklch(0% 0 0 / 0.4);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    width: 240px;
    max-width: 100%;
    outline: none;
    transition: border-color var(--duration-instant) var(--ease-out-quart);
}

.repo-request-input::placeholder {
    color: var(--mist);
    opacity: 0.5;
}

.repo-request-input:focus {
    border-color: var(--seafoam);
}

.repo-request-input:focus-visible {
    border-color: var(--seafoam);
    box-shadow: 0 0 0 2px var(--seafoam);
}

.repo-request-hint {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--mist);
    opacity: 0.75;
    margin-top: 0.25rem;
    text-align: left;
}

.repo-request-submit {
    padding: 0.6rem 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--abyss);
    background: var(--seafoam);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: opacity var(--duration-instant) var(--ease-out-quart),
        transform var(--duration-instant) var(--ease-out-quart);
    white-space: nowrap;
}

.repo-request-submit:focus-visible {
    outline: 2px solid var(--seafoam);
    outline-offset: 2px;
}

.repo-request-submit:hover {
    opacity: 0.85;
}

.repo-request-submit:active {
    transform: scale(0.97);
}

.repo-request-note {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--mist);
    opacity: 0.6;
    margin-top: var(--space-sm);
}

.repo-request-feedback {
    flex-basis: 100%;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    min-height: 1.5em;
    opacity: 0;
    transition: opacity var(--duration-short) var(--ease-out-quart);
}

.repo-request-feedback.visible {
    opacity: 1;
}

.repo-request-feedback.error {
    color: var(--ember);
}

.repo-request-feedback.success {
    color: var(--seafoam);
}

.repo-request-input.invalid {
    border-color: var(--ember);
}

/* --- Delight: Observatory star icon --- */

.repo-request-icon.seafoam {
    color: var(--seafoam);
    opacity: 1;
}

.repo-request-icon.pulse {
    animation: starPulse 0.7s var(--ease-out-quart);
}

@keyframes starPulse {
    0% { transform: scale(1); }
    40% { transform: scale(1.35); opacity: 0.75; }
    100% { transform: scale(1); opacity: 1; }
}

/* --- Delight: Button breath during submission --- */

.repo-request-submit.loading {
    animation: buttonBreath 1.4s ease-in-out infinite;
}

@keyframes buttonBreath {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.65; }
}

/* --- Delight: Section success glow --- */

.repo-request.glow {
    border-color: var(--seafoam);
    transition: border-color 0.5s var(--ease-out-quart);
}

@media (max-width: 639px) {
    .visualization-canvas {
        min-height: auto;
        aspect-ratio: 4 / 3;
    }

    svg#main-chart {
        min-height: auto;
    }

    .noise-overlay {
        opacity: 0;
    }

    .selector-pill {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .selector-pill::-webkit-scrollbar {
        display: none;
    }

    .settings-group .control-label {
        display: none;
    }

    .insight-card {
        padding: var(--space-md);
        border-radius: var(--radius-md);
    }

    .fossil-card {
        padding: var(--space-sm) var(--space-md);
    }

    .repo-request,
    .fossil-finder {
        padding: var(--space-md);
    }

    .repo-request-submit {
        width: 100%;
    }
}

@media (min-width: 640px) and (max-width: 1023px) {
    .visualization-canvas {
        min-height: auto;
        aspect-ratio: 16 / 9;
    }

    svg#main-chart {
        min-height: auto;
    }
}

@media (max-width: 480px) {
    .repo-request-input {
        width: 100%;
    }

    .repo-request-form {
        flex-direction: column;
        align-items: stretch;
    }

    .repo-request-submit {
        width: 100%;
    }
}

@media (max-height: 480px) and (orientation: landscape) {
    .visualization-canvas {
        min-height: auto;
        aspect-ratio: 16 / 9;
    }

    svg#main-chart {
        min-height: auto;
    }
}

@media (pointer: coarse) {
    .repo-btn,
    .mode-btn,
    .scale-btn {
        min-height: 44px;
    }

    .fossil-card,
    .repo-request-input,
    .repo-request-submit {
        min-height: 44px;
    }

    .help-icon {
        width: 44px;
        height: 44px;
    }

    .repo-btn:active,
    .mode-btn:active,
    .scale-btn:active {
        background: oklch(100% 0 0 / 0.08);
    }

    .fossil-card:active,
    .insight-card:active {
        transform: scale(0.98);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .insight-card:hover,
    .fossil-card:hover {
        transform: none;
    }

    .author-badge:hover {
        transform: none;
    }

    .repo-btn:hover,
    .mode-btn:hover,
    .scale-btn:hover {
        transform: none;
    }

    .skeleton-pill,
    .skeleton-tick,
    .skeleton-wave {
        animation: none;
    }
}