:root {
    --bg: #ffffff;
    --bg-soft: #f4f6fa;
    --bg-card: #ffffff;
    --text: #1c2330;
    --text-muted: #5b6577;
    --rule: #e2e6ee;
    --accent: #2f6db5;
    --accent-2: #5e9c3f;
    --accent-soft: #e8f0fb;
    --button: #1f2733;
    --button-text: #ffffff;
    --code-bg: #f4f6fa;
    --shadow: 0 1px 2px rgba(20, 30, 50, 0.06), 0 6px 24px rgba(20, 30, 50, 0.08);
    --radius: 12px;
    --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-title: "Source Serif 4", Georgia, "Times New Roman", serif;
    --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #0f1319;
        --bg-soft: #161b23;
        --bg-card: #161b23;
        --text: #e4e8f0;
        --text-muted: #9aa4b5;
        --rule: #262d38;
        --accent: #6ea4e8;
        --accent-2: #8cc46b;
        --accent-soft: #1b2635;
        --button: #e4e8f0;
        --button-text: #0f1319;
        --code-bg: #161b23;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 24px rgba(0, 0, 0, 0.35);
        color-scheme: dark;
    }
}

:root[data-theme="dark"] {
    --bg: #0f1319;
    --bg-soft: #161b23;
    --bg-card: #161b23;
    --text: #e4e8f0;
    --text-muted: #9aa4b5;
    --rule: #262d38;
    --accent: #6ea4e8;
    --accent-2: #8cc46b;
    --accent-soft: #1b2635;
    --button: #e4e8f0;
    --button-text: #0f1319;
    --code-bg: #161b23;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.65 var(--font);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

main {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 16px 64px;
}

/* Header */

header.hero {
    text-align: center;
    padding: 56px 16px 24px;
    max-width: 980px;
    margin: 0 auto;
}

.venue {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 999px;
    padding: 4px 14px;
    margin-bottom: 18px;
}

h1 {
    font-family: var(--font-title);
    font-weight: 700;
    font-size: clamp(1.7rem, 4.2vw, 2.75rem);
    line-height: 1.18;
    margin: 0 auto 20px;
    max-width: 880px;
    text-wrap: balance;
}

.authors {
    font-size: 1.15rem;
    margin: 0 0 4px;
}

.authors span + span::before {
    content: "\00a0\00a0\00b7\00a0\00a0";
    color: var(--text-muted);
}

.affiliations {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0 0 26px;
}

.affiliations span + span::before {
    content: "\00a0\00a0\00a0";
}

.links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: 999px;
    border: none;
    background: var(--button);
    color: var(--button-text);
    font: 600 0.95rem var(--font);
    cursor: pointer;
    transition: transform 0.12s ease, opacity 0.12s ease;
}

.button:hover {
    text-decoration: none;
    transform: translateY(-1px);
    opacity: 0.92;
}

.button svg {
    width: 18px;
    height: 18px;
    flex: none;
}

.button.secondary {
    background: var(--bg-soft);
    color: var(--text);
    border: 1px solid var(--rule);
}

/* Sections */

section {
    padding-top: 44px;
}

h2 {
    font-family: var(--font-title);
    font-size: 1.65rem;
    margin: 0 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--rule);
}

h3 {
    font-size: 1.12rem;
    margin: 30px 0 8px;
}

p {
    margin: 0 0 14px;
}

.lead {
    font-size: 1.05rem;
}

.muted {
    color: var(--text-muted);
}

figure {
    margin: 20px 0;
}

figure img,
figure video {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: var(--bg-soft);
}

figcaption {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 10px;
    line-height: 1.5;
}

figcaption b {
    color: var(--text);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

.grid-2 figure {
    margin: 0;
}

/* Paper renders on white, letterboxed to a common height */
.grid-2 img {
    aspect-ratio: 1;
    object-fit: contain;
    background: #fff;
}

.side-by-side {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 24px;
    align-items: center;
}

.side-by-side figure img {
    box-shadow: none;
    background: transparent;
}

@media (max-width: 720px) {
    .grid-2,
    .side-by-side {
        grid-template-columns: 1fr;
    }
}

.equation {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 4px 0;
}

.card {
    background: var(--bg-soft);
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    padding: 18px 20px;
}

/* Pipeline diagram, scrolled sideways on narrow screens so that its text stays legible */

.pipeline-scroll {
    overflow-x: auto;
}

.pipeline {
    display: block;
    width: 100%;
    min-width: 640px;
    height: auto;
    margin: 8px 0 4px;
}

.pipeline .box {
    fill: var(--bg-card);
    stroke: var(--rule);
    stroke-width: 1.5;
}

.pipeline .box.accent {
    fill: var(--accent-soft);
    stroke: var(--accent);
}

.pipeline .box.green {
    stroke: var(--accent-2);
}

.pipeline text {
    fill: var(--text);
    font: 600 13px var(--font);
}

.pipeline text.small {
    fill: var(--text-muted);
    font: 400 11.5px var(--font);
}

.pipeline .arrow {
    stroke: var(--text-muted);
    stroke-width: 1.6;
    fill: none;
}

.pipeline .loop {
    stroke: var(--accent);
    stroke-width: 1.6;
    stroke-dasharray: 5 4;
    fill: none;
}

.pipeline .head {
    fill: var(--text-muted);
}

.pipeline .head.accent {
    fill: var(--accent);
}

/* Steps */

.steps {
    counter-reset: step;
    list-style: none;
    padding: 0;
    margin: 18px 0 0;
}

.steps li {
    counter-increment: step;
    position: relative;
    padding-left: 44px;
    margin-bottom: 14px;
}

.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 1px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Demo */

.demo-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    background: #cddbf0 center / cover no-repeat;
}

@media (max-width: 720px) {
    .demo-frame {
        aspect-ratio: 4 / 5;
    }
}

.demo-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.demo-frame .launch {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: linear-gradient(rgba(15, 20, 30, 0.15), rgba(15, 20, 30, 0.45));
    color: #fff;
    border: 0;
    cursor: pointer;
    font: 600 1.05rem var(--font);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
}

.demo-frame .launch .play {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
    transition: transform 0.15s ease;
}

.demo-frame .launch:hover .play {
    transform: scale(1.06);
}

.scene-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 14px 0 6px;
}

.chip {
    border: 1px solid var(--rule);
    background: var(--bg-soft);
    color: var(--text);
    border-radius: 999px;
    padding: 5px 13px;
    font: 500 0.88rem var(--font);
    cursor: pointer;
}

.chip:hover,
.chip.active {
    border-color: var(--accent);
    color: var(--accent);
}

.controls-help {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 22px;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 12px;
}

.controls-help span {
    white-space: nowrap;
}

kbd {
    font: 600 0.8rem var(--font-mono);
    background: var(--bg-soft);
    border: 1px solid var(--rule);
    border-bottom-width: 2px;
    border-radius: 5px;
    padding: 1px 6px;
    color: var(--text);
}

/* Objective explorer */

.explorer {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 20px;
    align-items: start;
}

@media (max-width: 820px) {
    .explorer {
        grid-template-columns: 1fr;
    }
}

.explorer canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    touch-action: none;
    display: block;
    cursor: crosshair;
}

.panel {
    display: flex;
    flex-direction: column;
    gap: 14px;
    font-size: 0.92rem;
}

.panel label {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    margin-bottom: 4px;
}

.panel label output {
    font: 500 0.85rem var(--font-mono);
    color: var(--text-muted);
}

.panel input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

.segmented {
    display: flex;
    border: 1px solid var(--rule);
    border-radius: 10px;
    overflow: hidden;
}

.segmented button {
    flex: 1;
    border: 0;
    background: var(--bg-soft);
    color: var(--text);
    padding: 7px 6px;
    font: 500 0.84rem var(--font);
    cursor: pointer;
}

.segmented button + button {
    border-left: 1px solid var(--rule);
}

.segmented button.active {
    background: var(--accent);
    color: #fff;
}

.readout {
    font: 0.84rem/1.5 var(--font-mono);
    color: var(--text-muted);
    background: var(--bg-soft);
    border: 1px solid var(--rule);
    border-radius: 10px;
    padding: 10px 12px;
    min-height: 3.4em;
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    font-size: 0.84rem;
    color: var(--text-muted);
    margin-top: 10px;
}

.legend i {
    display: inline-block;
    width: 18px;
    height: 0;
    vertical-align: middle;
    margin-right: 6px;
    border-top: 2px solid;
}

/* Tables */

.table-wrap {
    overflow-x: auto;
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.92rem;
    font-variant-numeric: tabular-nums;
}

th,
td {
    text-align: right;
    padding: 7px 12px;
    border-bottom: 1px solid var(--rule);
}

th:first-child,
td:first-child {
    text-align: left;
}

thead th {
    color: var(--text-muted);
    font-weight: 600;
}

td.best {
    font-weight: 700;
    color: var(--accent);
}

/* Code */

pre {
    position: relative;
    background: var(--code-bg);
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    padding: 16px 18px;
    overflow-x: auto;
    font: 0.86rem/1.55 var(--font-mono);
    margin: 0;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.copy {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 12px;
    font-size: 0.8rem;
}

.code-map {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 6px 18px;
    font-size: 0.92rem;
}

.code-map code {
    color: var(--accent);
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 28px 16px 40px;
    border-top: 1px solid var(--rule);
}

.theme-toggle {
    position: fixed;
    top: 14px;
    right: 14px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--rule);
    background: var(--bg-soft);
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}