/* SR-72 Darkstar interactive cutaway — drafting-room identity
   cool steel neutrals + heat-tint bronze accent (from the airframe's own thermal tinting) */

:root{
  --ground:#0B0F13;
  --panel:#11171D;
  --panel-2:#171F26;
  --rule:#232E38;
  --rule-soft:#1A232B;
  --ink:#DDE4EA;
  --muted:#7C8A97;
  --accent:#E08B3C;      /* heat straw */
  --accent-dim:#8A5320;
  --steel:#5CA6C8;       /* cold inlet air */
  --good:#5FB98B;
  --display:'Archivo',system-ui,-apple-system,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,Consolas,monospace;
  --pane-w:264px;
  --bar-h:52px;
  --status-h:30px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--ground);color:var(--ink);
  font-family:var(--mono);font-size:13px;
  overflow:hidden;-webkit-font-smoothing:antialiased;
}
button{font:inherit;color:inherit}

#app{
  height:100%;
  display:grid;
  grid-template-columns:var(--pane-w) 1fr var(--pane-w);
  grid-template-rows:var(--bar-h) 1fr var(--status-h);
  grid-template-areas:
    "top top top"
    "left view right"
    "status status status";
}
#app.panels-hidden{grid-template-columns:0 1fr 0}
#app.panels-hidden #left,#app.panels-hidden #right{display:none}

/* ---------------- top bar ---------------- */
#topbar{
  grid-area:top;display:flex;align-items:center;gap:20px;
  padding:0 16px;background:var(--panel);
  border-bottom:1px solid var(--rule);
}
.brand{display:flex;align-items:baseline;gap:9px;min-width:0}
.brand-mark{
  font-family:var(--display);font-weight:700;font-size:17px;
  letter-spacing:-.01em;color:var(--accent);
}
.brand-name{font-family:var(--display);font-weight:600;font-size:17px;letter-spacing:-.01em}
.brand-sub{
  color:var(--muted);font-size:11px;letter-spacing:.04em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

/* variant tabs — V1 beauty / V2 technical */
.variants{display:flex;gap:0;margin-left:18px;border:1px solid var(--rule);flex:none}
.variant{
  background:transparent;border:none;border-left:1px solid var(--rule);
  padding:8px 14px;font-size:11px;letter-spacing:.08em;cursor:pointer;
  color:var(--muted);white-space:nowrap;transition:color .12s,background .12s;
}
.variant:first-child{border-left:none}
.variant:hover{color:var(--ink);background:var(--panel-2)}
.variant[aria-pressed="true"]{color:var(--ink);background:var(--panel-2);font-weight:600;box-shadow:inset 0 -2px 0 var(--accent)}

.modes{display:flex;margin-left:auto;border:1px solid var(--rule)}
.mode{
  background:transparent;border:none;border-left:1px solid var(--rule);
  padding:8px 13px;font-size:11px;letter-spacing:.09em;text-transform:uppercase;
  cursor:pointer;color:var(--muted);transition:color .12s,background .12s;
}
.mode:first-child{border-left:none}
.mode:hover{color:var(--ink);background:var(--panel-2)}
.mode[aria-pressed="true"]{background:var(--accent);color:#12181D;font-weight:600}

.topactions{display:flex;gap:8px;margin-left:12px}
.btn{
  background:transparent;border:1px solid var(--rule);padding:8px 15px;
  font-size:11px;letter-spacing:.09em;text-transform:uppercase;cursor:pointer;
  transition:border-color .12s,background .12s;
}
.btn:hover{border-color:var(--ink)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#12181D;font-weight:600}
.btn.primary:hover{opacity:.88}
button:focus-visible,input:focus-visible{outline:2px solid var(--steel);outline-offset:2px}

/* ---------------- side panels ---------------- */
#left{grid-area:left;border-right:1px solid var(--rule)}
#right{grid-area:right;border-left:1px solid var(--rule)}
#left,#right{background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
#left::-webkit-scrollbar,#right::-webkit-scrollbar,.tree::-webkit-scrollbar{width:9px}
#left::-webkit-scrollbar-thumb,#right::-webkit-scrollbar-thumb{background:var(--rule);border:3px solid var(--panel)}

.pane{border-bottom:1px solid var(--rule);padding:14px 14px 16px}
.pane h2{
  margin:0 0 11px;font-size:10px;font-weight:600;letter-spacing:.15em;
  text-transform:uppercase;color:var(--muted);
}
.pane-tools{display:flex;gap:5px;margin-bottom:10px;flex-wrap:wrap}
.mini{
  background:var(--panel-2);border:1px solid var(--rule);padding:5px 9px;
  font-size:10px;letter-spacing:.06em;text-transform:uppercase;cursor:pointer;color:var(--muted);
}
.mini:hover{color:var(--ink);border-color:var(--muted)}

/* component tree */
.tree{display:flex;flex-direction:column;gap:1px}
.tnode{display:flex;align-items:center;gap:8px;padding:6px 7px;cursor:pointer;background:transparent}
.tnode:hover{background:var(--panel-2)}
.tnode.child{padding-left:22px;font-size:11.5px}
.tnode.sel{background:var(--accent-dim)}
.tnode input{accent-color:var(--accent);margin:0;cursor:pointer;flex:none;width:13px;height:13px}
.tnode .swatch{width:3px;height:13px;flex:none}
.tnode .tlabel{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tnode .tcount{color:var(--muted);font-size:10px;font-variant-numeric:tabular-nums}
.tgroup > .expander{
  flex:none;width:13px;text-align:center;color:var(--muted);
  font-size:10px;user-select:none;
}

/* environment picker */
.envs{display:flex;flex-direction:column;gap:1px;background:var(--rule);border:1px solid var(--rule)}
.env,.cfg,.ab{
  background:var(--panel-2);border:none;padding:8px 10px;text-align:left;cursor:pointer;
  font-size:11px;letter-spacing:.06em;color:var(--muted);transition:color .12s,background .12s;
}
.env:hover,.cfg:hover,.ab:hover{color:var(--ink)}
.env[aria-pressed="true"],.cfg[aria-pressed="true"],.ab[aria-pressed="true"]{color:var(--ink);background:var(--accent-dim);font-weight:600}

/* slider + checks */
.slider{display:block;margin-bottom:10px}
.slider-label{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:7px}
.slider-label b{color:var(--ink);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--accent)}
.check{display:flex;align-items:center;gap:8px;font-size:11.5px;cursor:pointer}
.check input{accent-color:var(--accent)}
.hint{color:var(--muted);font-size:11px;line-height:1.55;margin:10px 0 0}

/* GA list */
.ga{margin:0}
.ga div{display:flex;justify-content:space-between;gap:10px;padding:6px 0;border-bottom:1px solid var(--rule-soft)}
.ga div:last-child{border-bottom:none}
.ga dt{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.04em}
.ga dd{margin:0;font-weight:600;font-size:12px;font-variant-numeric:tabular-nums}

/* info panel */
#info h3{font-family:var(--display);font-size:15px;font-weight:600;margin:0 0 4px}
#info .info-sub{color:var(--accent);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;margin:0 0 10px}
#info p{font-size:12px;line-height:1.62;color:var(--ink);margin:0 0 10px}
#info .info-empty{color:var(--muted);font-size:11.5px;line-height:1.6}
#info em{color:var(--accent);font-style:normal}
#info dl{margin:10px 0 0;border-top:1px solid var(--rule-soft);padding-top:8px}
#info dl div{display:flex;justify-content:space-between;gap:10px;padding:4px 0}
#info dt{color:var(--muted);font-size:11px}
#info dd{margin:0;font-size:11.5px;font-weight:600;font-variant-numeric:tabular-nums}

/* ---------------- viewport ---------------- */
#viewport{grid-area:view;position:relative;background:var(--ground);min-width:0;min-height:0}
#c{display:block;width:100%;height:100%;touch-action:none}

#views{
  position:absolute;left:14px;bottom:14px;display:flex;gap:1px;flex-wrap:wrap;
  background:var(--rule);border:1px solid var(--rule);
}
#views button{
  background:rgba(17,23,29,.92);border:none;padding:7px 11px;cursor:pointer;
  font-size:10px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);
}
#views button:hover{color:var(--ink);background:var(--panel-2)}
#views button.on{color:var(--accent)}

#readout{
  position:absolute;right:14px;top:14px;min-width:190px;
  background:rgba(17,23,29,.92);border:1px solid var(--rule);padding:9px 11px;
  backdrop-filter:blur(6px);
}
.ro-row{display:flex;justify-content:space-between;gap:12px;padding:3px 0;font-size:10.5px}
.ro-row span{color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.ro-row b{font-weight:600;font-variant-numeric:tabular-nums;text-align:right}

#scalebar{
  position:absolute;right:14px;bottom:14px;display:flex;align-items:center;gap:8px;
  color:var(--muted);font-size:10px;letter-spacing:.08em;
}
#scalebar i{display:block;height:1px;background:var(--muted);width:var(--scale-w,90px)}
#scalebar i::before,#scalebar i::after{content:"";position:absolute;width:1px;height:7px;background:var(--muted);margin-top:-3px}

#loading{
  position:absolute;inset:0;display:grid;place-items:center;
  background:var(--ground);z-index:5;transition:opacity .4s ease;
}
#loading.done{opacity:0;pointer-events:none}
/* id selector outranks the UA [hidden] rule, so state it explicitly */
#loading[hidden]{display:none!important}
.load-inner{text-align:center}
.load-label{display:block;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.load-bar{width:190px;height:2px;background:var(--rule);overflow:hidden}
.load-bar i{display:block;height:100%;width:38%;background:var(--accent);animation:sweep 1.1s ease-in-out infinite}
@keyframes sweep{0%{transform:translateX(-100%)}100%{transform:translateX(360%)}}

#drophint{
  position:absolute;inset:16px;border:1px dashed var(--accent);
  display:none;place-content:center;text-align:center;gap:6px;
  background:rgba(224,139,60,.07);z-index:6;pointer-events:none;
}
#drophint.on{display:grid}
#drophint strong{font-family:var(--display);font-size:16px;color:var(--accent)}
#drophint span{font-size:11px;color:var(--muted)}

/* gallery */
#gallery{display:grid;grid-template-columns:1fr 1fr;gap:6px}
#gallery a{display:block;border:1px solid var(--rule);line-height:0}
#gallery img{width:100%;height:auto;display:block}
#gallery a:hover{border-color:var(--accent)}

/* ---------------- gallery ---------------- */
#app.gallery-on{grid-template-columns:1fr;grid-template-areas:"top" "gal" "status"}
#app.gallery-on #left,#app.gallery-on #right,#app.gallery-on #viewport{display:none}
/* viewer-only controls have no meaning on the gallery */
#app.gallery-on .modes,#app.gallery-on #snapshot,#app.gallery-on #togglepanel{display:none}
#galleryview{grid-area:gal;overflow-y:auto;background:var(--ground);padding:30px 30px 60px}
#app.gallery-on #galleryview{display:block}

.gal-head{max-width:760px;margin:0 0 28px}
.gal-head h1{
  font-family:var(--display);font-size:26px;font-weight:700;letter-spacing:-.015em;
  margin:0 0 8px;color:var(--ink);
}
.gal-head p{margin:0;font-size:12.5px;line-height:1.65;color:var(--muted);max-width:64ch}
.gal-notice{margin-top:10px!important;font-size:11px;letter-spacing:.08em;color:var(--accent)!important}

.gal-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:18px}
.gal-card{
  border:1px solid var(--rule);background:var(--panel);cursor:zoom-in;
  display:flex;flex-direction:column;transition:border-color .14s;
}
.gal-card:hover{border-color:var(--accent)}
.gal-card img{width:100%;height:auto;display:block;background:var(--panel-2)}
.gal-meta{padding:11px 13px 13px;border-top:1px solid var(--rule)}
.gal-meta h3{font-family:var(--display);font-size:14px;font-weight:600;margin:0 0 5px;color:var(--ink)}
.gal-meta p{margin:0;font-size:11.5px;line-height:1.55;color:var(--muted)}
.gal-dims{
  display:block;margin-top:7px;font-size:10px;letter-spacing:.08em;
  color:var(--muted);opacity:.75;font-variant-numeric:tabular-nums;
}

/* lightbox */
#lightbox{
  position:fixed;inset:0;z-index:60;background:rgba(6,9,12,.97);
  display:flex;flex-direction:column;
}
#lightbox[hidden]{display:none!important}
.lb-bar{
  display:flex;align-items:center;gap:10px;padding:11px 14px;
  border-bottom:1px solid var(--rule);flex:none;
}
.lb-title{font-family:var(--display);font-size:14px;font-weight:600;flex:1;min-width:0;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lb-zoom{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;min-width:46px;text-align:right}
.lb-count{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;letter-spacing:.08em}
.lb-nav{
  position:absolute;top:50%;transform:translateY(-50%);z-index:2;
  width:44px;height:76px;border:1px solid var(--rule);
  background:rgba(11,15,19,.82);color:var(--ink);
  font-size:26px;line-height:1;cursor:pointer;
  display:grid;place-items:center;transition:background .14s,border-color .14s;
}
.lb-nav:hover{background:var(--accent);border-color:var(--accent);color:#12181d}
.lb-nav.prev{left:12px}
.lb-nav.next{right:12px}
.lb-nav[disabled]{opacity:.28;pointer-events:none}
.lb-stage{flex:1;overflow:hidden;position:relative;cursor:grab;min-height:0}
.lb-stage.dragging{cursor:grabbing}
#lb-img{
  position:absolute;top:50%;left:50%;transform-origin:0 0;
  max-width:none;user-select:none;-webkit-user-drag:none;
}
.lb-cap{
  margin:0;padding:11px 16px;border-top:1px solid var(--rule);flex:none;
  font-size:11.5px;line-height:1.55;color:var(--muted);
}

@media (max-width:820px){
  #galleryview{padding:18px 14px 50px}
  .gal-grid{grid-template-columns:1fr}
  .lb-bar{flex-wrap:wrap}
  .lb-title{flex-basis:100%}
}

/* ---------------- status bar ---------------- */
#statusbar{
  grid-area:status;display:flex;align-items:center;gap:12px;padding:0 14px;
  background:var(--panel);border-top:1px solid var(--rule);
  font-size:10.5px;color:var(--muted);letter-spacing:.05em;
}
.spacer{flex:1}
.kbd-hints{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
kbd{
  background:var(--panel-2);border:1px solid var(--rule);padding:2px 5px;
  font-family:var(--mono);font-size:9.5px;color:var(--ink);
}

/* ---------------- responsive ---------------- */
@media (max-width:1100px){
  :root{--pane-w:224px}
  .brand-sub{display:none}
}
@media (max-width:820px){
  #app{
    grid-template-columns:1fr;
    grid-template-rows:auto 1fr auto var(--status-h);
    grid-template-areas:"top" "view" "left" "status";
  }
  #right{display:none}
  #left{border-right:none;border-top:1px solid var(--rule);max-height:38vh}
  #topbar{flex-wrap:wrap;height:auto;padding:10px 12px;gap:10px}
  .modes{margin-left:0;width:100%}
  .mode{flex:1;padding:8px 4px;font-size:10px}
  .topactions{margin-left:auto}
  #views{left:8px;bottom:8px}
  #readout{right:8px;top:8px;min-width:150px}
  #scalebar{display:none}
  .kbd-hints{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
}