/* The Post-Original Holbein — layout; components from /ui/components.css */
html, body { height: 100%; }
/* Paper ground: pure white is harsh under a long text column. Surfaces stay near-white so the
   lab panels still read as raised cards against it. */
[data-theme="light"] { --background: 43 22% 95%; --muted: 42 14% 91%; --border: 40 10% 85%; }
body { display: flex; flex-direction: column; overflow: hidden; }
code { font-family: var(--font-mono); font-size: var(--text-xs); background: hsl(var(--muted)); padding: 1px 5px; border-radius: 4px; }

.topbar { display: flex; align-items: center; gap: 20px; height: 52px; padding: 0 14px; border-bottom: 1px solid hsl(var(--border)); background: hsl(var(--background) / .85); backdrop-filter: blur(10px); flex: none; }
/* Wordmark doubles as the home control. */
.brand { display: flex; align-items: center; text-decoration: none; color: inherit; border-radius: 6px; padding: 3px 6px; margin-left: -6px; }
.brand:hover { background: hsl(var(--muted)); }
.brand:focus-visible { outline: 2px solid hsl(var(--primary)); outline-offset: 1px; }
.brand-name { font-size: var(--text-base); font-weight: var(--weight-semibold); letter-spacing: -0.015em; white-space: nowrap; }
.topnav { display: flex; gap: 2px; margin-left: 4px; }
/* stock .tabs-trigger; links carry aria-current rather than aria-selected */
.topnav .tabs-trigger[aria-current="page"] { background: hsl(var(--background)); color: hsl(var(--foreground)); box-shadow: var(--shadow-sm); }
.topnav .tabs-trigger { text-decoration: none; display: inline-flex; align-items: center; }
.topnav .tabs-trigger:hover:not([aria-current="page"]) { color: hsl(var(--foreground)); background: hsl(var(--background) / .5); }
.top-group { display: flex; align-items: center; gap: 6px; }
.top-group[hidden] { display: none; }
.group-label { grid-column: 1 / -1; margin: 6px 0 0; font-size: var(--text-xs); font-weight: var(--weight-medium); letter-spacing: var(--tracking-wide);
  text-transform: uppercase; color: hsl(var(--muted-foreground)); }
.group-label:first-child { margin-top: 0; }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 6px; }
#engine-pill .dot { background: hsl(var(--muted-foreground)); }
#engine-pill[data-state="ready"] .dot { background: hsl(var(--success)); }
#engine-pill[data-state="busy"] .dot { background: hsl(var(--warning)); animation: pulse 1.2s infinite; }

/* ---------- lab grid: [sidebar][stage][inspector] ---------- */
.lab { flex: 1; min-height: 0; display: grid; gap: 8px; padding: 8px; grid-template-columns: 272px minmax(0, 1fr) 292px; }
.lab.no-left { grid-template-columns: 0 minmax(0, 1fr) 292px; }
.lab.no-right { grid-template-columns: 272px minmax(0, 1fr) 0; }
.lab.no-left.no-right { grid-template-columns: 0 minmax(0, 1fr) 0; }
.lab.no-left #sidebar, .lab.no-right #inspector { display: none; }
body.clean .lab { grid-template-columns: 0 minmax(0, 1fr) 0; padding: 0; gap: 0; }
body.clean #sidebar, body.clean #inspector, body.clean .stage-reveal, body.clean [data-float] { display: none !important; }
body.clean .stage { border: 0; border-radius: 0; }

/* collapse control sits inside the panel it closes */
/* every report/log image opens in the shared viewer, same affordance as the essay */
.zoomable { cursor: zoom-in; transition: opacity .15s; }
.zoomable:hover { opacity: .88; }
.zoomable:focus-visible { outline: 2px solid hsl(var(--foreground)); outline-offset: 2px; }
.traj-desc { margin: 6px 0 2px; line-height: 1.5; }
.kf b { font-weight: var(--weight-medium); color: hsl(var(--foreground)); }
/* collapse control sits at the foot of the panel it closes, icon only */
.panel-foot { flex: none; display: flex; justify-content: flex-end; padding: 4px 2px 2px; }
.panel-collapse { display: grid; place-items: center; width: 26px; height: 26px; padding: 0; border: 0;
  border-radius: calc(var(--radius) - 4px); background: transparent; color: hsl(var(--muted-foreground));
  cursor: pointer; transition: color .15s, background .15s; }
.panel-collapse:hover { color: hsl(var(--foreground)); background: hsl(var(--muted)); }
.panel-collapse svg { width: 15px; height: 15px; }

/* re-open handles float over the stage rather than holding a column open */
.stage-reveal { position: absolute; top: 50%; transform: translateY(-50%); z-index: 3; display: none;
  align-items: center; justify-content: center; width: 22px; height: 52px; padding: 0;
  border: 1px solid hsl(var(--border)); background: hsl(var(--card) / .92); backdrop-filter: blur(6px);
  color: hsl(var(--muted-foreground)); cursor: pointer; transition: color .15s, background .15s; }
.stage-reveal:hover { color: hsl(var(--foreground)); background: hsl(var(--accent)); }
.stage-reveal svg { width: 15px; height: 15px; }
.stage-reveal.left { left: 0; border-left: 0; border-radius: 0 6px 6px 0; }
.stage-reveal.right { right: 0; border-right: 0; border-radius: 6px 0 0 6px; }
.lab.no-left #reveal-left, .lab.no-right #reveal-right { display: flex; }

/* collapsible sections */
.sidebar, .inspector { display: flex; flex-direction: column; min-height: 0; }
.inspector { gap: 8px; padding-right: 1px; }
.side-section { border-bottom: 1px solid hsl(var(--border)); }
.sidebar .side-section:last-child { border-bottom: 0; }
.inspector .side-section { border-bottom: 0; }
.side-section > summary { list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px; cursor: pointer; font-size: var(--text-sm); font-weight: var(--weight-semibold); user-select: none; }
.side-section > summary::-webkit-details-marker { display: none; }
.side-section > summary::before { content: "▸"; font-size: var(--text-2xs); color: hsl(var(--muted-foreground)); margin-right: 6px; transition: transform .15s; }
.side-section[open] > summary::before { transform: rotate(90deg); }
.side-section > summary > span:first-child { flex: 1; }
.side-body { padding: 0 12px 12px; display: flex; flex-direction: column; gap: 8px; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 8px; }

/* segmented control */
.seg { display: flex; padding: 3px; gap: 2px; border-radius: calc(var(--radius) - 2px); background: hsl(var(--muted)); }
.seg button { flex: 1; height: 26px; padding: 0 6px; border: 0; border-radius: 6px; background: transparent; color: hsl(var(--muted-foreground)); font-size: var(--text-xs); font-weight: var(--weight-medium); cursor: pointer; white-space: nowrap; }
.seg button[aria-selected="true"] { background: hsl(var(--background)); color: hsl(var(--foreground)); box-shadow: var(--shadow-sm); }

/* compact lists (viewpoints, trajectories, runs) */
.vp-list { display: flex; flex-direction: column; gap: 2px; }
.vp { display: grid; grid-template-columns: 10px 1fr auto; gap: 8px; align-items: center; width: 100%; padding: 5px 8px; border: 1px solid transparent; border-radius: 7px; background: transparent; color: inherit; text-align: left; cursor: pointer; font-size: var(--text-xs); }
.vp:hover { background: hsl(var(--accent) / .6); }
.vp.active { background: hsl(var(--accent)); border-color: hsl(var(--border)); }
.vp .sw { width: 9px; height: 9px; border-radius: 50%; }
.vp .name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: var(--weight-medium); }
.vp .sub { color: hsl(var(--muted-foreground)); font-size: var(--text-xs); font-variant-numeric: tabular-nums; white-space: nowrap; }
.vp .key { font-family: var(--font-mono); font-size: var(--text-2xs); color: hsl(var(--muted-foreground)); }
.vp .x { margin-left: 4px; color: hsl(var(--muted-foreground)); font-size: var(--text-xs); }
.vp .x:hover { color: hsl(var(--destructive)); }
.traj-controls { display: flex; align-items: center; gap: 6px; }
.kf-list { display: flex; flex-direction: column; gap: 2px; font-size: var(--text-xs); font-variant-numeric: tabular-nums; }
.kf-list .kf { display: flex; justify-content: space-between; gap: 6px; padding: 3px 8px; border-radius: 6px; background: hsl(var(--muted) / .6); }
.toggle-grid .switch-label { font-size: var(--text-xs); font-weight: var(--weight-regular); }

/* stage */
.stage { display: flex; flex-direction: column; min-height: 0; overflow: hidden; }
.stage-body { position: relative; flex: 1; min-height: 0; background: #000; }
#canvas { touch-action: none; }
#canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.split-handle { position: absolute; top: 0; bottom: 0; left: var(--split, 50%); width: 0; pointer-events: none; }
.split-handle span { position: absolute; top: 0; bottom: 0; left: -1px; width: 2px; background: hsl(0 0% 98%); box-shadow: 0 0 0 1px rgb(0 0 0 / .5); }
.split-handle::after { content: attr(data-label); position: absolute; top: 12px; left: 0; transform: translateX(-50%); padding: 2px 8px; border-radius: 999px; background: hsl(0 0% 98%); color: #000; font-size: var(--text-xs); white-space: nowrap; }
.stage-loading { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; background: rgb(0 0 0 / .55); backdrop-filter: blur(3px); }
.float { position: absolute; pointer-events: none; }
.float > * { pointer-events: auto; }
.float-tl { top: 10px; left: 10px; } .float-tr { top: 10px; right: 10px; } .float-bl { bottom: 10px; left: 10px; } .float-br { bottom: 10px; right: 10px; max-width: 46%; text-align: right; }
.hud-pose { padding: 7px 10px; border-radius: 8px; border: 1px solid hsl(var(--border)); background: hsl(var(--background) / .75); backdrop-filter: blur(6px); font-size: var(--text-xs); }
.hud-row { display: flex; gap: 6px; align-items: baseline; font-variant-numeric: tabular-nums; }
.hud-row b { font-weight: var(--weight-semibold); min-width: 40px; }
.minimap-wrap { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; }
#minimap { border-radius: 8px; border: 1px solid hsl(var(--border)); background: hsl(var(--background) / .85); cursor: crosshair; }
.minimap-wrap.collapsed #minimap { display: none; }
.hud-hint { display: inline-block; padding: 4px 8px; border-radius: 6px; background: hsl(var(--background) / .6); }
.stage-body:fullscreen .hud-hint { display: none; }

.controls { display: flex; flex-direction: column; gap: 8px; }
.control { display: flex; flex-direction: column; gap: 2px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 5px 12px; margin: 0; font-size: var(--text-xs); }
.kv dt { color: hsl(var(--muted-foreground)); }
.kv dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
.cap-recent { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.cap-recent img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 6px; border: 1px solid hsl(var(--border)); cursor: pointer; }

/* pages */
.page { flex: 1; min-height: 0; overflow: auto; padding: 24px 32px; }
.page-head h1 { font-size: var(--text-xl); font-weight: var(--weight-semibold); letter-spacing: var(--tracking-tight); line-height: 1.15; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.log-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.log-card { overflow: hidden; }
.log-card img, .log-card video { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; background: #000; cursor: pointer; }
.log-card .body { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 4px; font-size: var(--text-xs); }
.log-card .name { font-family: var(--font-mono); font-size: var(--text-xs); word-break: break-all; color: hsl(var(--muted-foreground)); }
.versions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.versions a { font-size: var(--text-xs); }
.reports { display: grid; grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); gap: 16px; }
.reports .card { padding: 16px; }
.reports h3 { font-size: var(--text-sm); margin-bottom: 8px; }
.reports table { width: 100%; border-collapse: collapse; font-size: var(--text-xs); font-variant-numeric: tabular-nums; }
.reports th, .reports td { padding: 5px 6px; border-bottom: 1px solid hsl(var(--border)); text-align: right; white-space: nowrap; }
.reports th:first-child, .reports td:first-child { text-align: left; }
.reports img { width: 100%; border-radius: 6px; border: 1px solid hsl(var(--border)); }
.reports svg { width: 100%; height: auto; }
.reports .full { grid-column: 1 / -1; }
.prose h2 { font-size: var(--text-base); margin: 22px 0 6px; }
.prose p, .prose li { margin-bottom: 8px; }
.prose table { border-collapse: collapse; font-size: var(--text-sm); margin: 8px 0 12px; }
.prose th, .prose td { border-bottom: 1px solid hsl(var(--border)); padding: 5px 10px; text-align: left; font-variant-numeric: tabular-nums; }
.lightbox-inner { display: flex; gap: 16px; max-width: 92vw; max-height: 90vh; }
.lightbox-inner img { max-width: 65vw; max-height: 88vh; border-radius: 8px; }
.lightbox-inner #lightbox-meta { width: 320px; max-height: 88vh; white-space: pre-wrap; padding: 12px; background: hsl(var(--card)); border: 1px solid hsl(var(--border)); border-radius: 8px; }
@media (min-width: 769px) and (max-width: 1100px) { .lab { grid-template-columns: 240px minmax(0, 1fr) 0; } #inspector, #reveal-right { display: none !important; } }

/* Header: shed the optional controls before the bar can push the page sideways. */
.topbar [data-tip]:hover::after { top: calc(100% + 8px); bottom: auto; }
.top-actions [data-tip]:hover::after { left: auto; right: 0; transform: none; }
.topnav { min-width: 0; }
.top-actions { min-width: 0; margin-left: auto; }
@media (max-width: 1040px) { #engine-pill { display: none; } }
@media (max-width: 900px)  { #btn-clean { display: none; } }
@media (max-width: 820px)  { #btn-run-sharp-top { display: none; } .brand-name { font-size: var(--text-base); } }
@media (max-width: 700px)  { .topnav .nav-link { padding-left: 7px; padding-right: 7px; } }

/* Keep the Lab laid out (but invisible, non-interactive) while another page is shown, so the WebGL canvas
   keeps its size and captures / SHARP runs work from any page. */
.lab[hidden] { display: grid !important; visibility: hidden; position: absolute; inset: 52px 0 0 0; pointer-events: none; }

/* explicit grid placement so hidden panels do not shift the stage into a collapsed column */
#sidebar { grid-column: 1; } .lab > .stage { grid-column: 2; } #inspector { grid-column: 3; }

/* ---------- reports: numbered sections, three-column grid ---------- */
.reports { display: block; }
.rsec { margin-bottom: 28px; }
.rsec-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 10px; }
.rsec-num { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); font-weight: var(--weight-semibold); font-size: var(--text-sm); flex: none; }
.rsec h2 { font-size: var(--text-base); }
.rgrid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.rgrid .span2 { grid-column: span 2; } .rgrid .span3 { grid-column: 1 / -1; }
.rcard { padding: 14px; min-width: 0; }
.rcard h3 { font-size: var(--text-sm); margin-bottom: 8px; }
.rcard table { width: 100%; border-collapse: collapse; font-size: var(--text-xs); font-variant-numeric: tabular-nums; }
.rcard th, .rcard td { padding: 4px 6px; border-bottom: 1px solid hsl(var(--border)); text-align: right; white-space: nowrap; }
.rcard th:first-child, .rcard td:first-child { text-align: left; }
.rcard img { width: 100%; border-radius: 6px; border: 1px solid hsl(var(--border)); }
.rcard svg { width: 100%; height: auto; }
.rdetails { border: 1px dashed hsl(var(--border)); border-radius: var(--radius); padding: 10px 14px; }
.rdetails > summary { cursor: pointer; font-size: var(--text-sm); font-weight: var(--weight-medium); }
.rdetails .rgrid { margin-top: 10px; }
@media (max-width: 1200px) { .rgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .rgrid .span2 { grid-column: 1 / -1; } }
/* ================= the essay: one column, one width ================= */
.page-article { padding: 0 24px 96px; }
.prose { max-width: var(--measure); margin: 0 auto; font-size: var(--text-base); line-height: var(--leading-relaxed);
  color: hsl(var(--foreground)); }
.prose > section { max-width: var(--measure); margin: 0 0 30px; }
.prose p { margin: 0 0 16px; }
.prose a { color: inherit; text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px;
  text-decoration-color: hsl(var(--foreground) / .3); }
.prose a:hover { text-decoration-color: hsl(var(--foreground)); }

/* masthead: title block, then the picture, both at the column width */
.mhead { padding: 44px 0 10px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.mhead h1 { font-size: var(--text-4xl); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight);
  font-weight: var(--weight-semibold); margin: 0 0 10px; }
.mhead .msub { font-size: var(--text-xl); line-height: var(--leading-snug); letter-spacing: var(--tracking-snug);
  font-weight: var(--weight-regular); color: hsl(var(--muted-foreground)); margin: 0 0 16px; }
.mmeta { font-size: var(--text-sm); color: hsl(var(--muted-foreground)); margin-bottom: 26px;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.mtag { font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase;
  padding: 3px 9px; border: 1px solid hsl(var(--border)); border-radius: 999px;
  color: hsl(var(--muted-foreground)); text-decoration: none; }
.mtag:hover { color: hsl(var(--foreground)); border-color: hsl(var(--foreground) / .4); }
.prose .mtag, .prose .mtag:hover { text-decoration: none; }   /* the pill is not a run of prose */
.mhead-fig { margin: 0 0 8px; }
.mhead-fig img { width: 100%; height: auto; display: block; border-radius: var(--radius); background: hsl(var(--muted)); }
.mhead-fig figcaption, .mfig figcaption { font-size: var(--text-sm); line-height: 1.5; color: hsl(var(--muted-foreground)); margin-top: 10px; }

/* headings carry weight, not rules */
.prose h2 { font-size: var(--text-lg); font-weight: var(--weight-semibold); letter-spacing: var(--tracking-snug);
  color: hsl(var(--foreground)); margin: 38px 0 12px; }
.prose h2 .num { color: hsl(var(--muted-foreground)); font-weight: var(--weight-regular); margin-right: 8px; }
.prose h3 { font-size: var(--text-sm); font-weight: var(--weight-medium); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: hsl(var(--muted-foreground)); margin: 24px 0 8px; }
.prose .lede { font-size: var(--text-lg); line-height: var(--leading-snug); color: hsl(var(--foreground)); margin: 0 0 28px; }
.pull { font-size: var(--text-lg); line-height: 1.55; font-weight: var(--weight-medium); margin: 24px 0; padding-left: 16px;
  border-left: 2px solid hsl(var(--border)); color: hsl(var(--foreground)); }
.prose ul, .prose ol { padding-left: 20px; margin: 0 0 16px; }
.prose li { margin-bottom: 9px; }
.prose code { font-family: var(--font-mono); font-size: .85em; background: hsl(var(--muted)); padding: 1px 5px; border-radius: 4px; }

/* figures sit at the column width, never wider */
.mfig { margin: 24px 0 26px; max-width: 100%; }
.mfig img { display: block; width: 100%; height: auto; border-radius: var(--radius); background: #fff;
  cursor: zoom-in; transition: opacity .15s; }
.mfig img:hover { opacity: .88; }
.mfig img:focus-visible { outline: 2px solid hsl(var(--ring, var(--foreground))); outline-offset: 3px; }
.mfig figcaption b { color: hsl(var(--foreground)); font-weight: var(--weight-semibold); }

/* reference tables: spacing instead of rules */
.prose table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); margin: 4px 0 16px; }
.prose .glossary th { width: 140px; text-align: left; vertical-align: top; padding: 7px 16px 7px 0;
  font-weight: var(--weight-medium); color: hsl(var(--muted-foreground)); }
.prose .glossary td { padding: 7px 0; line-height: 1.6; vertical-align: top; }


/* report, phase 5: a figure's two views stacked inside one column */
.rpair { display: grid; gap: 10px; }
.rpair figure { margin: 0; }
.rpair figcaption { margin-top: 4px; }

/* the introduction: a dialog over whichever page is showing */
.intro-card { width: min(560px, calc(100vw - 32px)); max-height: calc(100vh - 48px); overflow: auto; padding: 18px 22px 18px;
  border: 1px solid hsl(var(--border)); border-radius: var(--radius); background: hsl(var(--card)); box-shadow: var(--shadow-lg);
  font-size: var(--text-sm); line-height: var(--leading-normal); color: hsl(var(--foreground)); animation: pop .15s ease; }
.intro-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 0 -8px 10px 0; }
.intro-label { font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: hsl(var(--muted-foreground)); }
.intro-card p { margin: 0 0 12px; }
.intro-card ul { margin: 0 0 6px; padding-left: 18px; }
.intro-card li { margin-bottom: 6px; }
.intro-card b { font-weight: var(--weight-semibold); }
.intro-card i { font-style: italic; }
.intro-foot { display: flex; justify-content: flex-end; margin-top: 10px; }
@media (max-width: 768px) { .intro-card { padding: 16px; max-height: calc(100vh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom)); } }

/* published copy: read-only, so the controls that write are replaced by a line saying where they run */
.static-note { display: none; }
body.static-build .static-note { display: block; }
body.static-build .static-hide { display: none; }
body.static-build .side-body:has(> #btn-run-sharp) > :not(.static-note) { display: none; }
body.static-build .side-body:has(> #cap-tag) > :not(.static-note, #cap-recent) { display: none; }
.stage-note { max-width: 420px; display: grid; gap: 8px; padding: 20px 22px; text-align: left;
  border: 1px solid hsl(var(--border)); border-radius: var(--radius); background: hsl(var(--card));
  font-size: var(--text-sm); line-height: var(--leading-normal); color: hsl(var(--muted-foreground)); }
.stage-note b { color: hsl(var(--foreground)); font-weight: var(--weight-semibold); }
body.static-build #btn-capture, body.static-build #btn-run-sharp-top { display: none; }

/* ---------- tooltips ----------
   The stock [data-tip]::after is laid out inside the trigger and cannot leave a
   scrolling ancestor, so it is disabled here and one fixed node does the work. */
[data-tip]:hover::after { content: none !important; }
.tip { position: fixed; z-index: 100; padding: 5px 9px; border-radius: 6px; pointer-events: none;
  background: hsl(var(--popover)); color: hsl(var(--popover-foreground));
  border: 1px solid hsl(var(--border)); box-shadow: var(--shadow);
  font-size: var(--text-xs); line-height: 1.35; max-width: 280px; white-space: nowrap; }
.tip[hidden] { display: none; }

/* ---------- stacking order, stated once ----------
   0 stage content · 3 stage furniture · 4 floats · 20 header · 60 dialog · 100 tooltip */
.topbar { z-index: 20; position: relative; }
.float { z-index: 4; }
.stage-reveal { z-index: 3; }
.dialog-backdrop { z-index: 60; }

/* numbered notes: markers in the text, list at the foot, links both ways */
.fnref { font-size: .68em; line-height: 0; vertical-align: super; margin-left: 1px; }
.fnref a { text-decoration: none; color: hsl(var(--muted-foreground)); padding: 0 1px; }
.fnref a:hover { color: hsl(var(--foreground)); text-decoration: underline; }
.footnotes { list-style: decimal outside; padding-left: 26px; margin: 4px 0 14px; }
.footnotes li { font-size: var(--text-sm); line-height: 1.55; margin-bottom: 10px; padding-left: 4px; }
.footnotes li::marker { color: hsl(var(--muted-foreground)); }
.fnback { text-decoration: none; color: hsl(var(--muted-foreground)); margin-left: 2px; }
.fnback:hover { color: hsl(var(--foreground)); }
.fn-flash { animation: fnflash 1.2s ease; border-radius: 3px; }
@keyframes fnflash { 0%, 40% { background: hsl(var(--muted)); } 100% { background: transparent; } }

/* bibliography: hanging indent */
.refs ul { list-style: none; padding: 0; margin: 0; }
.refs li { font-size: var(--text-sm); line-height: 1.55; margin-bottom: 11px; padding-left: 24px; text-indent: -24px; }
.notes { font-size: var(--text-sm); color: hsl(var(--muted-foreground)); }
.notes li { margin-bottom: 8px; }

/* ================= image viewer ================= */
.lightbox-panel { display: flex; flex-direction: column; gap: 12px; width: min(1100px, calc(100vw - 48px));
  max-height: calc(100vh - 48px); padding: 16px; border-radius: var(--radius); background: hsl(var(--background));
  border: 1px solid hsl(var(--border)); box-shadow: var(--shadow); animation: pop .15s ease; }
.lightbox-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lightbox-head .dialog-title { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: var(--weight-medium);
  color: hsl(var(--muted-foreground)); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lightbox-head-actions { display: flex; align-items: center; gap: 4px; flex: none; }
.lightbox-body { flex: 1; min-height: 0; display: flex; align-items: center; justify-content: center;
  border-radius: calc(var(--radius) - 2px); background: hsl(var(--muted)); overflow: hidden; }
.lightbox-body img { max-width: 100%; max-height: calc(100vh - 200px); object-fit: contain; display: block; }
#lightbox-cap { margin: 0; }
.lightbox-meta { margin: 0; max-height: 160px; font-family: var(--font-mono); font-size: var(--text-xs); line-height: 1.5;
  white-space: pre-wrap; padding: 10px; border-radius: calc(var(--radius) - 2px); background: hsl(var(--muted));
  color: hsl(var(--muted-foreground)); overflow: auto; }

/* ================= phones: the stage is the page, the panels are drawers ================= */
.drawer-head, .drawer-scrim, .stage-bar { display: none; }
@media (max-width: 768px) {
  :root { --topbar-h: 48px; }
  /* header: the tabs take the width; the title lives on the Method page */
  :root { --topbar-h: 56px; }
  .topbar { height: calc(var(--topbar-h) + env(safe-area-inset-top)); padding: env(safe-area-inset-top) 8px 0 8px; gap: 6px; }
  .brand { display: none; }
  .topnav { flex: 1; margin-left: 0; padding: 3px; }
  .topnav .tabs-trigger { flex: 1; justify-content: center; padding: 0 2px; height: 38px; font-size: var(--text-sm); font-weight: var(--weight-medium); }
  .top-actions { gap: 2px; }
  #lab-actions { display: none !important; }

  /* the lab: one stage, edge to edge */
  /* overflow hidden: an off-canvas drawer's transformed box would otherwise widen the
     scrollable area, and a phone browser answers that by zooming the whole page out */
  .lab, .lab.no-left, .lab.no-right, .lab.no-left.no-right { display: block; position: relative; padding: 0; gap: 0; overflow: hidden; }
  .lab[hidden] { display: block !important; inset: calc(var(--topbar-h) + env(safe-area-inset-top)) 0 0 0; }
  .lab > .stage { position: absolute; inset: 0; border: 0; border-radius: 0; }
  .panel-foot, .stage-reveal { display: none !important; }

  /* the two panels slide in over the stage */
  #sidebar, #inspector, .lab.no-left #sidebar, .lab.no-right #inspector {
    display: flex; position: absolute; top: 0; bottom: 0; width: min(86vw, 360px); z-index: 6; margin: 0;
    border-radius: 0; overflow-y: auto; background: hsl(var(--card)); box-shadow: var(--shadow-lg);
    transition: transform .22s ease; padding-bottom: env(safe-area-inset-bottom); }
  #sidebar { left: 0; transform: translateX(-102%); border-right: 1px solid hsl(var(--border)); }
  #inspector { right: 0; transform: translateX(102%); border-left: 1px solid hsl(var(--border)); padding: 0 8px 8px; gap: 8px; }
  .lab.open-left #sidebar, .lab.open-right #inspector { transform: none; }
  .drawer-head { display: flex; align-items: center; justify-content: space-between; flex: none; padding: 10px 6px 4px 12px;
    font-size: var(--text-sm); font-weight: var(--weight-semibold); }
  #inspector .drawer-head { padding-left: 6px; }
  .drawer-scrim { display: block; position: absolute; inset: 0; z-index: 5; background: rgb(0 0 0 / .5);
    opacity: 0; pointer-events: none; transition: opacity .2s; }
  .lab.open-left .drawer-scrim, .lab.open-right .drawer-scrim { opacity: 1; pointer-events: auto; }

  /* what stays on the stage: a small pose readout, the plan, and a bar of three controls */
  .stage-bar { display: flex; position: absolute; left: 10px; right: 10px; bottom: calc(10px + env(safe-area-inset-bottom)); z-index: 3;
    padding: 4px; gap: 4px; border-radius: 14px; border: 1px solid hsl(var(--border)); background: hsl(var(--card) / .92); backdrop-filter: blur(10px); box-shadow: var(--shadow-lg); }
  .bar-btn { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; height: 50px; border: 0; border-radius: 10px;
    background: transparent; color: hsl(var(--muted-foreground)); font: inherit; font-size: var(--text-2xs); font-weight: var(--weight-medium); letter-spacing: .02em; cursor: pointer; }
  .bar-btn svg { width: 20px; height: 20px; }
  .bar-btn:active { background: hsl(var(--muted)); }
  .lab.open-left .bar-btn[data-drawer="left"], .lab.open-right .bar-btn[data-drawer="right"] { background: hsl(var(--secondary)); color: hsl(var(--foreground)); }
  .float-bl { bottom: calc(76px + env(safe-area-inset-bottom)); }
  .float-tl { top: 8px; left: 8px; max-width: calc(100% - 16px); }
  .hud-pose { padding: 5px 8px; font-size: var(--text-2xs); }
  .hud-row b { min-width: 34px; }
  .float-tr, .float-br { display: none; }
  .float-bl { left: 8px; }
  #minimap { width: 150px; height: auto; }
  .stage-note { max-width: calc(100% - 32px); padding: 16px; }
  .stage-loading .progress { max-width: calc(100% - 48px); }

  /* pages */
  .page { padding: 16px 16px 48px; }
  .page-article { padding: 0 16px calc(64px + env(safe-area-inset-bottom)); }
  .mhead { padding: 22px 0 8px; }
  .mhead h1 { font-size: 30px; }
  .mhead .msub { font-size: var(--text-lg); }
  .prose .lede, .pull { font-size: var(--text-base); }
  .prose .glossary th { width: 96px; padding-right: 10px; }
  .rgrid { grid-template-columns: minmax(0, 1fr); }
  .rgrid .span2 { grid-column: auto; }
  .rcard { overflow-x: auto; }
  .versions a { max-width: 100%; white-space: normal; height: auto; padding-top: 4px; padding-bottom: 4px; }
  .lightbox-panel { width: calc(100vw - 16px); }
  .lightbox-body img { max-height: calc(100vh - 150px); }
  .toaster { left: 12px; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom)); }
  .toast { width: auto; }
}

/* ================= motion ================= */
/* Pages fade up as they arrive; dialogs fade and settle in, and play the same in reverse on the way out. */
@keyframes page-in { from { opacity: 0; transform: translateY(6px); } }
@keyframes fade-out { to { opacity: 0; } }
@keyframes pop-out { to { opacity: 0; transform: scale(.97); } }
.page:not([hidden]) { animation: page-in .22s ease; }
.dialog-backdrop.closing { animation: fade-out .18s ease forwards; pointer-events: none; }
.dialog-backdrop.closing > * { animation: pop-out .18s ease forwards; }
.lightbox-panel { animation: pop .18s ease; }
.toast { animation: slidein .22s cubic-bezier(.2, .8, .2, 1); }
@media (prefers-reduced-motion: reduce) {
  .page:not([hidden]), .dialog-backdrop, .dialog-backdrop.closing, .dialog-backdrop.closing > *, .lightbox-panel, .intro-card, .toast { animation: none; }
  #sidebar, #inspector, .drawer-scrim { transition: none; }
}