/* site.css — MAGS-SLAM project page */

:root {
    --ink: #16181d;
    --accent: #003e74;
    --accent-ink: #002a50;
    --accent-tint: #e8eef5;
    --line: #e3e5e9;
    --surface: #f5f6f8;
    --stage: #f1f2f4;
    --arxiv: #b31b1b;
    --github: #24292f;
    --ieee: #003e74;
    --content: 1040px;
    --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    --radius: 10px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: #fff;
    color: var(--ink);
    font: 400 18.5px/1.65 var(--sans);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-ink); }
img, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }
sup { font-size: 0.68em; line-height: 0; }

.wrap { width: min(var(--content), 100% - 32px); margin-inline: auto; }

/* Navigation */

.nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    display: flex;
    align-items: center;
    gap: 28px;
    height: 60px;
    width: min(1240px, 100% - 32px);
    margin-inline: auto;
}

.nav-brand { font: 600 18.5px/1 var(--serif); color: var(--ink); letter-spacing: 0.01em; }
.nav-brand:hover { color: var(--ink); }

.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { position: relative; color: var(--ink); font-size: 15.5px; font-weight: 500; padding: 4px 0; }
.nav-links a:hover { color: var(--accent); }
.nav-links a.is-on { color: var(--accent); }
.nav-links a.is-on::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -2px;
    width: 14px;
    height: 2px;
    margin-left: -7px;
    border-radius: 1px;
    background: var(--accent);
}

/* Hero */

.hero { padding: 56px 0 8px; text-align: center; }

.title {
    margin: 0 auto;
    max-width: none;
    font: 600 clamp(32px, 5vw, 56px)/1.16 var(--serif);
    letter-spacing: -0.01em;
    text-wrap: balance;
}

.title-name { color: var(--accent); }
.nowrap { white-space: nowrap; }
/* On wide screens the title keeps its full size and sets in three fixed
   lines, running a little wider than the text column. */
.title-br { display: none; }
@media (min-width: 1180px) {
    .title-lines { width: 1148px; margin-inline: calc(50% - 574px); text-wrap: nowrap; }
    .title-br { display: inline; }
}

.authors {
    margin: 28px auto 0;
    font-size: 20px;
    line-height: 1.75;
}
.authors a { color: var(--ink); font-weight: 500; white-space: nowrap; }
.authors a:hover { color: var(--accent); }
.authors sup { margin-left: 1px; margin-right: 12px; }
.authors sup:last-child { margin-right: 0; }

.affiliations, .notes {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2px 16px;
    margin: 10px auto 0;
    max-width: 900px;
    font-size: 16.5px;
}
.notes { margin-top: 6px; font-size: 15.5px; }

.venue {
    margin: 18px 0 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
}

/* Buttons */

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 16px; }
.links-center { margin-top: 24px; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 37px;
    padding: 0 16px 0 14px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 500;
    color: #fff;
    background: var(--github);
    transition: filter 0.15s ease;
}
.btn:hover { color: #fff; filter: brightness(1.12); }
.btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn svg.fill { fill: currentColor; stroke: none; }
.btn-sm { height: 32px; padding: 0 14px; font-size: 14.5px; }
.btn-ieee { background: var(--ieee); }
.btn-arxiv { background: var(--arxiv); }
.btn-github { background: var(--github); }
.btn-data { background: var(--accent); }
.btn-outline { background: #fff; color: var(--ink); box-shadow: inset 0 0 0 1px #cfd3d9; }
.btn-outline:hover { color: var(--ink); filter: none; box-shadow: inset 0 0 0 1px var(--ink); }

/* Teaser */

.teaser { padding-top: 30px; }

.lead {
    margin: 0 auto 22px;
    text-align: center;
    font: 500 18.5px/1.5 var(--serif);
    text-wrap: balance;
}
.lead strong { color: var(--accent); font-weight: 600; }

.media { display: block; overflow: hidden; border-radius: var(--radius); background: var(--stage); }
.media video, .media img { width: 100%; height: auto; }

figure { margin: 0; }
figcaption { margin-top: 14px; font-size: 16px; line-height: 1.6; text-align: left; }
figcaption p { margin: 0 0 8px; }

/* Sections */

.block { padding: 64px 0 0; margin-top: 64px; border-top: 1px solid var(--line); }
.teaser + .block { margin-top: 56px; }

h2 {
    margin: 0 0 24px;
    text-align: center;
    font: 600 32.5px/1.25 var(--serif);
    letter-spacing: -0.005em;
}

h3 {
    margin: 44px 0 14px;
    font: 600 21.5px/1.35 var(--serif);
}
h2 + h3 { margin-top: 0; }

.prose p, .intro { margin: 0 0 16px; text-align: left; }
.prose p:last-child { margin-bottom: 0; }
.intro { margin-bottom: 22px; }

.hint { margin: 10px 0 0; font-size: 15px; }

.stages { margin: 0; padding-left: 20px; }
.stages li { margin-bottom: 6px; padding-left: 2px; }

.zoomable { cursor: zoom-in; background: #fff; }

/* Segmented controls and chips */

.seg {
    display: inline-flex;
    flex-wrap: wrap;
    padding: 3px;
    gap: 2px;
    border-radius: 8px;
    background: #e9ebee;
}
.seg button, .chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 13px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}
.seg button:hover { background: rgba(255, 255, 255, 0.6); }
.seg button.is-on { background: #fff; box-shadow: 0 1px 2px rgba(16, 24, 40, 0.12); }
.seg button:disabled { opacity: 0.45; cursor: progress; }
.seg button i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.seg-center { display: flex; width: max-content; margin: 0 auto 18px; }

.chip { background: #e9ebee; height: 38px; border-radius: 8px; }
.chip.is-on { background: var(--accent-tint); color: var(--accent-ink); box-shadow: inset 0 0 0 1px #b7c6d8; }

.icon-btn {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
}
.icon-btn:hover { background: #e9ebee; }
.icon-btn svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn svg.fill { fill: currentColor; stroke: none; }
.icon-btn.is-on { background: var(--accent-tint); color: var(--accent-ink); }
.icon-btn .i-pause, .icon-btn.is-on .i-play { display: none; }
.icon-btn.is-on .i-pause { display: block; }

/* 3D viewer */

.viewer-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
}

.viewer {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--stage);
    touch-action: pan-y;
}
.viewer canvas { display: block; width: 100%; height: 100%; outline: none; }

.viewer-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 12px;
    padding: 10px 12px;
    border-top: 1px solid var(--line);
    background: var(--surface);
}
.viewer-bar .seg { background: #e6e8eb; }
.bar-end { display: flex; gap: 2px; margin-left: auto; }

.replay { display: flex; align-items: center; gap: 6px; flex: 1 1 200px; max-width: 320px; }
.replay input { flex: 1; accent-color: var(--accent); }

.viewer-legend {
    position: absolute;
    left: 14px;
    bottom: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    padding: 6px 10px;
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.92);
    font-size: 14px;
    font-weight: 500;
    pointer-events: none;
}
.viewer-legend:empty { display: none; }
.viewer-legend span { display: inline-flex; align-items: center; gap: 6px; }
.viewer-legend i { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }

.viewer-toast {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    padding: 10px 16px;
    border-radius: 8px;
    background: rgba(22, 24, 29, 0.82);
    color: #fff;
    font-size: 15px;
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}
.viewer-toast.is-on { opacity: 1; }

.viewer-loading {
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}
.viewer-loading.is-on { opacity: 1; }
.viewer-progress { height: 100%; background: rgba(0, 62, 116, 0.15); }
.viewer-progress span { display: block; height: 100%; width: 4%; background: var(--accent); transition: width 0.2s ease; }

.viewer-error {
    position: absolute;
    inset: 0;
    display: none;
    place-items: center;
    padding: 24px;
    text-align: center;
    font-size: 16px;
}
.has-error .viewer-error { display: grid; }

.viewer-card:fullscreen { display: flex; flex-direction: column; border: 0; border-radius: 0; }
.viewer-card:fullscreen .viewer { flex: 1; aspect-ratio: auto; }

/* Thumbnail pickers */

.picker { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px 28px; margin-top: 18px; }
.picker-group { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.picker-title { font-size: 14px; font-weight: 600; letter-spacing: 0.02em; }
.picker-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

.thumb {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 120px;
    padding: 0;
    border: 0;
    background: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}
.thumb img {
    width: 120px;
    height: 78px;
    object-fit: cover;
    border-radius: 7px;
    box-shadow: 0 0 0 1px var(--line);
    transition: box-shadow 0.15s ease;
}
.thumb:hover img { box-shadow: 0 0 0 2px #b7c6d8; }
.thumb.is-on img { box-shadow: 0 0 0 2px var(--accent); }
.thumb.is-on span { color: var(--accent); font-weight: 600; }

.gallery .stage { aspect-ratio: 16 / 9; background: #fff; box-shadow: 0 0 0 1px var(--line); }
.gallery .stage video { width: 100%; height: 100%; object-fit: contain; }

/* Tables */

.table-figure { margin-top: 4px; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14.5px;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    border-top: 1.5px solid var(--ink);
    border-bottom: 1.5px solid var(--ink);
}
th, td { padding: 7px 8px; text-align: center; }
thead th { font-weight: 600; }
thead tr:first-child th[colspan] { border-bottom: 1px solid var(--line); }
thead tr:last-child th { border-bottom: 1px solid var(--ink); font-weight: 500; }
tbody th { text-align: left; font-weight: 500; padding-left: 4px; }
tbody tr.group-start > *, tbody tr.ours > * { border-top: 1px solid var(--line); }
tbody tr.ours { background: var(--accent-tint); }
tbody tr.ours th { font-weight: 600; }
td.best { font-weight: 700; }
td.second, .u { text-decoration: underline; text-underline-offset: 3px; }

/* Citation */

.bibtex, .code { position: relative; }
.bibtex pre, .code pre {
    margin: 0;
    padding: 20px 22px;
    overflow-x: auto;
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: inset 0 0 0 1px var(--line);
    font: 14.5px/1.65 var(--mono);
}
.copy {
    position: absolute;
    top: 12px;
    right: 12px;
    height: 30px;
    padding: 0 12px;
    border: 0;
    border-radius: 7px;
    background: #fff;
    box-shadow: inset 0 0 0 1px #cfd3d9;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}
.copy:hover { box-shadow: inset 0 0 0 1px var(--ink); }

.footer { margin-top: 72px; padding: 28px 0 40px; border-top: 1px solid var(--line); font-size: 15px; text-align: center; }
.footer p { margin: 0; }

/* Dataset page */

.hero-dataset { padding-top: 96px; }
.title-short { max-width: 960px; line-height: 1.24; }
.title-short + .venue { margin-top: 32px; }
.hero-dataset .links { margin-top: 30px; }
.venue a { color: inherit; text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin: 72px 0 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.stats div { padding: 28px 12px; }
.stats div + div { border-left: 1px solid var(--line); }
.stats dt { font: 600 32px/1.2 var(--serif); color: var(--accent); }
.stats dd { margin: 8px 0 0; font-size: 15.5px; white-space: nowrap; }

.features { margin: 0 0 16px; padding-left: 20px; }
.features li { margin-bottom: 6px; }

.scene { padding: 20px; margin-bottom: 20px; border: 1px solid var(--line); border-radius: var(--radius); }
.scene-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 2px 16px; margin-bottom: 14px; }
.scene-head h3 { margin: 0; font-size: 20.5px; }
.scene-head span { font-size: 15px; }
.scene-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 3fr); gap: 16px; align-items: center; }
.scene-mesh { width: 100%; height: auto; border-radius: 8px; }
.agents { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.agents.is-two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.agents figcaption { margin-top: 2px; text-align: center; font-size: 14.5px; font-weight: 500; }
.tile { position: relative; margin-bottom: 6px; }
.tile img { width: 100%; height: auto; border-radius: 6px; }
.tag { position: absolute; font-size: 12.5px; font-weight: 600; line-height: 1; color: #fff; text-shadow: 0 0 3px rgba(0, 0, 0, 0.85); }
.tag.tl { top: 6px; left: 7px; }
.tag.br { right: 7px; bottom: 6px; }
.subhead { margin: 32px 0 14px; text-align: center; }
.scene-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.scene-pair .scene { margin-bottom: 0; }

table.data { white-space: nowrap; font-size: 14px; }
table.data th, table.data td { text-align: left; padding: 7px 6px; }
table.data thead th { white-space: normal; vertical-align: bottom; line-height: 1.3; }
table.data td a { font-weight: 500; }
table.data tr.group-row td { padding-top: 12px; font-weight: 600; border-top: 1px solid var(--line); }
table.data.files { white-space: normal; font-size: 15px; }
table.data.files tbody th { white-space: nowrap; vertical-align: top; }
table.data.files td { line-height: 1.55; }
code { font: 0.9em var(--mono); }
.intro-gap { margin-top: 24px; margin-bottom: 10px; }
.table-gap { margin-top: 20px; }

/* Narrow screens */

@media (max-width: 860px) {
    /* Section links move to a second, horizontally scrolling row. */
    html { scroll-padding-top: 108px; }
    .nav-inner { flex-wrap: wrap; justify-content: space-between; gap: 0 16px; height: auto; padding-top: 10px; }
    .nav-links {
        order: 3;
        flex: 0 0 100%;
        gap: 20px;
        margin: 0;
        padding: 8px 0 9px;
        overflow-x: auto;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links a { font-size: 14.5px; white-space: nowrap; }
}

@media (max-width: 640px) {
    body { font-size: 16.5px; }
    .hero { padding-top: 40px; }
    .authors { font-size: 17.5px; }
    .affiliations { font-size: 15px; }
    .lead { font-size: 17px; }
    .block { padding-top: 48px; margin-top: 48px; }
    h2 { font-size: 26px; }
    .viewer { aspect-ratio: 4 / 3; }
    .viewer-legend { left: 8px; bottom: 8px; font-size: 13px; }
    .title { font-size: 27px; line-height: 1.22; }
    .authors { margin-top: 20px; line-height: 1.7; }
    .authors sup { margin-right: 8px; }
    .venue { font-size: 16px; }
    figcaption { font-size: 15px; }
    .zoomable { position: relative; }
    .zoomable::after {
        content: 'Tap to enlarge';
        position: absolute;
        right: 8px;
        bottom: 8px;
        padding: 3px 8px;
        border-radius: 6px;
        background: rgba(22, 24, 29, 0.7);
        color: #fff;
        font-size: 12.5px;
        font-weight: 500;
    }

    /* Viewer controls in two rows: display options, then replay and view. */
    .viewer-bar { gap: 8px; padding: 8px 10px; }
    .replay { order: 5; flex: 1 0 60%; max-width: none; }
    .bar-end { order: 6; }
    .viewer-bar [data-role="layer"] { flex: 0 0 100%; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
    .viewer-bar [data-role="layer"]::-webkit-scrollbar { display: none; }
    #coverage-card .viewer-legend { display: none; }

    /* Thumbnail pickers become one horizontally scrolling strip. */
    .picker {
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: 18px;
        margin-inline: -16px;
        padding: 0 16px 6px;
        overflow-x: auto;
        scroll-snap-type: x proximity;
        scroll-padding-inline: 16px;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }
    .picker::-webkit-scrollbar { display: none; }
    .picker-group { align-items: flex-start; flex: none; }
    .picker-title { font-size: 13px; color: #5b6270; white-space: nowrap; }
    .picker-row { flex-wrap: nowrap; gap: 8px; }
    .thumb { scroll-snap-align: start; flex: none; }
    .thumb, .thumb img { width: 100px; }
    .thumb img { height: 64px; }
    .thumb span { white-space: nowrap; font-size: 13.5px; }

    /* Wide tables scroll sideways; a fade on the right shows there is more. */
    .table-scroll {
        margin-inline: -16px;
        padding-inline: 16px;
        -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 28px), transparent);
        mask-image: linear-gradient(to right, #000 calc(100% - 28px), transparent);
    }
    table { font-size: 13.5px; }
    th, td { padding: 6px 7px; }
    .bibtex pre, .code pre { padding: 16px; font-size: 12.5px; }
    .hero-dataset { padding-top: 56px; }
    .stats { grid-template-columns: repeat(2, 1fr); margin-top: 48px; }
    .stats div { padding: 20px 8px; }
    .stats dt { font-size: 26px; }
    .stats dd { font-size: 14px; white-space: normal; }
    .stats div:nth-child(3) { border-left: 0; }
    .stats div:nth-child(n+3) { border-top: 1px solid var(--line); }
    .scene { padding: 14px; }
    .scene-body { grid-template-columns: 1fr; }
    .scene-mesh { max-width: 240px; margin: 0 auto; }
    .agents { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .scene-pair { grid-template-columns: 1fr; }
}