:root{color-scheme:light;box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}html{scroll-padding-top:env(safe-area-inset-top,0px)}body{margin:0;padding:0;font:14px -apple-system,BlinkMacSystemFont,sans-serif;background:#fff;color:#000}img{max-width:100%}[hidden]:not([hidden=until-found i]){display:none!important}

/* Layout: inspection bench. The 3D stage dominates; an inspection rail (right on desktop, below on phone) carries controls, the part card and the parts index. */
:root{
  --bg:#e9edee; --panel:#f7f9f9; --ink:#15212b; --muted:#56666f; --line:#cdd6db;
  --accent:#0e7c86; --accent-ink:#ffffff; --stage:#dfe5e7; --grid:#b4c0c6; --grid2:#cdd6da;
  --p-mesh:#0e7c86; --p-doc:#2f5fb3; --p-std:#7a4bb0; --p-est:#b06a12; --p-user:#56666f;
  --display:"Saira Condensed","Arial Narrow",sans-serif;
  --body:"IBM Plex Sans",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0f1519; --panel:#151d22; --ink:#dfe7ea; --muted:#8b9ba4; --line:#26323a;
  --accent:#3fc1c9; --accent-ink:#06262a; --stage:#11181d; --grid:#2b3840; --grid2:#1b252b;
  --p-mesh:#3fc1c9; --p-doc:#7aa2f0; --p-std:#b892e6; --p-est:#e3a14a; --p-user:#8b9ba4; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0f1519; --panel:#151d22; --ink:#dfe7ea; --muted:#8b9ba4; --line:#26323a;
  --accent:#3fc1c9; --accent-ink:#06262a; --stage:#11181d; --grid:#2b3840; --grid2:#1b252b;
  --p-mesh:#3fc1c9; --p-doc:#7aa2f0; --p-std:#b892e6; --p-est:#e3a14a; --p-user:#8b9ba4; color-scheme:dark}
[hidden]{display:none!important}
html,body{height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:14px;overflow:hidden}
.app{display:flex;flex-direction:column;height:100%}
.stage{position:relative;flex:1 1 55%;min-height:300px;background:var(--stage);touch-action:none}
.stage canvas{display:block;width:100%;height:100%}
.hud{position:absolute;top:12px;left:max(16px,env(safe-area-inset-left,0px));right:max(16px,env(safe-area-inset-right,0px));display:flex;justify-content:space-between;gap:8px;pointer-events:none;align-items:flex-start}
.plate{font-family:var(--display);line-height:1;min-width:0}
.plate b{display:block;font-size:30px;font-weight:700;letter-spacing:.01em}
.plate span{display:block;font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.03em;margin-top:4px}
.tval{font-family:var(--mono);font-size:11px;color:var(--muted);text-align:right;font-variant-numeric:tabular-nums}
.tval b{font-family:var(--display);font-size:28px;color:var(--accent);display:block;font-weight:700}
.loading{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--mono);font-size:12px;color:var(--muted);pointer-events:none}
.drop{position:absolute;inset:8px;border:2px dashed var(--accent);border-radius:6px;display:grid;place-items:center;font-family:var(--display);font-size:22px;color:var(--accent);background:color-mix(in srgb,var(--stage) 80%,transparent)}
.status{position:absolute;bottom:10px;left:max(16px,env(safe-area-inset-left,0px));right:max(16px,env(safe-area-inset-right,0px));font-family:var(--mono);font-size:11px;color:var(--muted);pointer-events:none}
.rail{flex:0 1 45%;overflow-y:auto;background:var(--panel);border-top:1px solid var(--line);
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:14px 28px;
  display:flex;flex-direction:column;gap:18px}
@media (min-width:880px){
  .app{flex-direction:row}
  .stage{flex:1 1 auto;min-height:0}
  .rail{flex:0 0 380px;border-top:0;border-left:1px solid var(--line);padding-left:20px}
}
section{display:flex;flex-direction:column;gap:8px;min-width:0}
h2{margin:0;font-family:var(--display);font-weight:500;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.seg{display:flex;flex-wrap:wrap;gap:6px}
button,.filebtn{font:500 13px var(--body);color:var(--ink);background:transparent;border:1px solid var(--line);border-radius:4px;padding:7px 11px;cursor:pointer;min-height:34px}
button:hover,.filebtn:hover{border-color:var(--accent)}
button[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
button:disabled{opacity:.45;cursor:default}
button:focus-visible,.filebtn:focus-within,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.filebtn{display:inline-flex;align-items:center;position:relative}
.filebtn input{position:absolute;inset:0;opacity:0;cursor:pointer}
input[type=range]{width:100%;accent-color:var(--accent)}
.row{display:flex;gap:10px;align-items:center}
.row label{font-family:var(--mono);font-size:11px;color:var(--muted);min-width:66px;font-variant-numeric:tabular-nums}
.formula{font-family:var(--mono);font-size:12px;line-height:1.55;border-left:2px solid var(--accent);padding:4px 0 4px 10px;display:flex;flex-direction:column;gap:4px}
.formula small{display:block;color:var(--muted);font-size:11px}
.card{border:1px solid var(--line);border-radius:6px;padding:12px;display:flex;flex-direction:column;gap:7px;background:var(--bg);min-width:0}
.card .k{font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.03em;overflow-wrap:anywhere}
.card .t{font-family:var(--display);font-size:22px;font-weight:700;line-height:1.05;text-wrap:balance}
.card p{margin:0;line-height:1.5}
.card dl{display:grid;grid-template-columns:auto minmax(0,1fr);gap:3px 10px;margin:2px 0 0;font-family:var(--mono);font-size:11px;font-variant-numeric:tabular-nums}
.card dt{color:var(--muted)} .card dd{margin:0;overflow-wrap:anywhere}
.card ul{margin:0;padding-left:16px;font-size:12px;line-height:1.5}
.card a{color:var(--accent);overflow-wrap:anywhere}
.badge{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;border:1px solid currentColor;border-radius:3px;padding:1px 6px;align-self:flex-start}
.badge i{width:7px;height:7px;border-radius:50%;background:currentColor}
.p-mesh{color:var(--p-mesh)} .p-doc{color:var(--p-doc)} .p-std{color:var(--p-std)} .p-est{color:var(--p-est)} .p-user{color:var(--p-user)}
.joints{display:flex;flex-direction:column;gap:4px}
.joints .row label{min-width:104px}
.joints output{font-family:var(--mono);font-size:11px;min-width:46px;text-align:right;font-variant-numeric:tabular-nums}
#pfilter{font:13px var(--body);color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:8px 10px;min-height:36px}
select{font:13px var(--body);color:var(--ink);background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:6px}
.counts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}
.counts div{border:1px solid var(--line);border-radius:4px;padding:6px 8px;display:flex;flex-direction:column;gap:2px;min-width:0}
.counts b{font-family:var(--display);font-size:20px;font-variant-numeric:tabular-nums;line-height:1}
.counts span{font-family:var(--mono);font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;overflow-wrap:anywhere}
details.grp{border-top:1px solid var(--line)}
details.grp>summary{list-style:none;cursor:pointer;padding:8px 0;display:flex;justify-content:space-between;gap:8px;font-weight:600;font-size:13px}
details.grp>summary::-webkit-details-marker{display:none}
details.grp>summary span{font-family:var(--mono);font-size:11px;color:var(--muted);font-weight:400}
.plist{display:flex;flex-direction:column;gap:2px;padding-bottom:8px;max-height:260px;overflow-y:auto}
.plist button{display:flex;align-items:center;gap:8px;text-align:left;border:0;border-radius:3px;padding:5px 6px;min-height:30px;font-size:12.5px;font-weight:400}
.plist button:hover{background:color-mix(in srgb,var(--accent) 12%,transparent)}
.plist button[aria-current="true"]{background:color-mix(in srgb,var(--accent) 22%,transparent)}
.plist button i{width:7px;height:7px;border-radius:50%;flex:none;background:currentColor}
.plist button em{font-style:normal;font-family:var(--mono);font-size:10.5px;color:var(--muted);margin-left:auto;white-space:nowrap}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:9px;height:9px;border-radius:50%;background:currentColor}
.gloss{font-size:12px;color:var(--muted);line-height:1.6;margin:0}
.gloss b{font-family:var(--mono);font-weight:500;color:var(--ink)}
.hint{font-size:12px;color:var(--muted);margin:0;line-height:1.5}
.hint b{color:var(--ink);font-weight:600}
.facts{margin:0;padding-left:16px;font-size:12.5px;line-height:1.55}
.src{display:flex;flex-direction:column;gap:4px;font-size:12px;line-height:1.45}
.src a{color:var(--accent);overflow-wrap:anywhere}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* Flashcards (additive): every selector is scoped to #flashcards; colours come from the page's existing tokens. */
#flashcards .fc{position:relative;display:flex;flex-direction:column;gap:10px;border:1px solid var(--line);border-radius:6px;padding:12px;background:var(--bg);min-width:0}
#flashcards .fc:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
#flashcards .fc-top{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;font-family:var(--mono);font-size:11px;color:var(--muted);min-width:0;min-height:20px}
#flashcards .fc-where{min-width:0;overflow-wrap:anywhere}
#flashcards .fc-count{margin-left:auto;color:var(--ink);font-variant-numeric:tabular-nums}
#flashcards .fc-bar{height:2px;background:var(--line);border-radius:1px;overflow:hidden}
#flashcards .fc-bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .25s ease}
#flashcards .fc-card{display:grid;grid-template-columns:112px minmax(0,1fr);gap:12px;align-items:start;min-height:120px;cursor:pointer;touch-action:pan-y;-webkit-user-select:none;user-select:none}
#flashcards .fc-card.fc-nothumb{grid-template-columns:minmax(0,1fr)}
#flashcards .fc-thumb{box-sizing:border-box;width:112px;height:112px;max-width:100%;border-radius:4px;background:var(--stage);border:1px solid var(--line);overflow:hidden}
/* A thin halo in the page's ink colour keeps white parts readable on light themes and black parts on dark ones. */
#flashcards .fc-thumb canvas{display:block;width:100%;height:100%;filter:drop-shadow(0 0 .6px color-mix(in srgb,var(--ink) 75%,transparent)) drop-shadow(0 0 .6px color-mix(in srgb,var(--ink) 50%,transparent))}
#flashcards .fc-face{display:flex;flex-direction:column;gap:6px;min-width:0}
#flashcards .fc-name{font-family:var(--display);font-size:20px;font-weight:700;line-height:1.05;text-wrap:balance;overflow-wrap:anywhere}
#flashcards .fc-q{margin:0;line-height:1.45}
#flashcards .fc-back{grid-column:1/-1;display:flex;flex-direction:column;gap:6px;border-top:1px dashed var(--line);padding-top:8px;animation:fc-in .2s ease}
#flashcards .fc-tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
#flashcards .fc-a{margin:0;line-height:1.45;font-weight:500}
#flashcards .fc-root,#flashcards .fc-terms{margin:0;font-size:12px;line-height:1.45;color:var(--muted)}
#flashcards .fc-root{font-style:italic}
#flashcards .fc-nav{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;gap:8px;align-items:stretch}
#flashcards .fc-nav button{min-height:44px}
#flashcards .fc-arrow{display:grid;place-items:center;padding:0}
#flashcards .fc-arrow svg{display:block}
#flashcards .fc-foot{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px}
#flashcards .fc-hint{flex:1 1 160px;min-width:0;margin:0;font-size:12px;line-height:1.45;color:var(--muted)}
#flashcards .fc-sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
#flashcards .fc-empty{margin:0;font-size:12.5px;line-height:1.5;color:var(--muted)}
@keyframes fc-in{from{opacity:0;transform:translateY(-3px)}to{opacity:1;transform:none}}
/* Phones: the page gives the rail under half the screen, so keep the card compact and the arrows always reachable. */
@media (max-width:879px){#flashcards .fc-nav{position:sticky;bottom:var(--fc-stick,0px);z-index:1;background:var(--bg);box-shadow:0 -1px 0 var(--line);padding:8px 0 4px;margin:-8px 0 -4px}}
@media (max-width:380px){#flashcards .fc-card{grid-template-columns:84px minmax(0,1fr);gap:10px}#flashcards .fc-thumb{width:84px;height:84px}#flashcards .fc-name{font-size:18px}}
@media (prefers-reduced-motion:reduce){#flashcards .fc-back{animation:none}#flashcards .fc-bar i{transition:none}}

/* Inspect 360° (additive): every selector is scoped to the new .ix elements in the stage; colours are the page's tokens. */
#stage .ix-open{position:absolute;z-index:3;right:max(16px,env(safe-area-inset-right,0px));bottom:40px;display:inline-flex;align-items:center;gap:8px;min-height:38px;padding:0 14px;background:var(--panel);font-family:var(--mono);font-size:12px;letter-spacing:.04em;box-shadow:0 6px 20px rgba(0,0,0,.12)}
#stage .ix-open svg{flex:none;color:var(--accent)}
#stage .ix{position:absolute;inset:0;z-index:4}
#stage .ix-veil{position:absolute;inset:0;background:var(--stage);opacity:0}
/* a thin outline in the page's ink colour keeps pale parts readable on light themes and black parts on dark ones */
#stage .ix-canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:grab;outline:none;opacity:0;filter:drop-shadow(0 0 1px color-mix(in srgb,var(--ink) 55%,transparent)) drop-shadow(0 0 .5px color-mix(in srgb,var(--ink) 40%,transparent))}
#stage .ix-canvas:focus-visible{outline:2px solid var(--accent);outline-offset:-4px}
#stage .ix-canvas.ix-grab{cursor:grabbing}
#stage .ix-bar{position:absolute;left:50%;bottom:12px;transform:translateX(-50%);width:max-content;max-width:calc(100% - 32px);display:flex;align-items:center;gap:8px;padding:8px 8px 8px 12px;background:var(--panel);border:1px solid var(--line);border-radius:6px;box-shadow:0 8px 28px rgba(0,0,0,.14)}
#stage .ix-text{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1 1 auto}
#stage .ix-name{display:flex;align-items:center;gap:8px;min-width:0}
#stage .ix-name .badge{flex:none;align-self:center}
#stage .ix-name b{min-width:0;font-family:var(--display);font-size:18px;font-weight:700;line-height:1.1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#stage .ix-meta{font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#stage .ix-bar button{flex:none}
#stage .ix-bar .ix-done{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
#stage .ix-scale{position:absolute;left:max(16px,env(safe-area-inset-left,0px));bottom:84px;display:flex;flex-direction:column;align-items:flex-start;gap:4px;font-family:var(--mono);font-size:11px;color:var(--ink);font-variant-numeric:tabular-nums;pointer-events:none;opacity:0;transition:opacity .3s ease}
#stage .ix-scale.on{opacity:1}
#stage .ix-scale i{display:block;height:6px;border:1.5px solid currentColor;border-top:0}
#stage .ix-sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
@media (max-width:560px){#stage .ix-bar{left:12px;right:12px;width:auto;max-width:none;transform:none}#stage .ix-name b{font-size:16px}#stage .ix-bar button{min-height:44px}}
@media (prefers-reduced-motion:reduce){#stage .ix-scale{transition:none}}