/* =========================================================
   Interactive demos — same skin as the rest of the site
   ========================================================= */
:root{
  color-scheme: dark;
  --bg:      #191919;
  --panel:   #1f1f1f;
  --well:    #151515;
  --line:    rgba(255,255,255,.13);
  --line-2:  rgba(255,255,255,.28);
  --txt:     #f2f2f2;
  --dim:     #b0b0b0;
  --faint:   #8a8a8a;
  --data-a:  #4a9fe0;   /* area / authalic  */
  --data-b:  #e08a4f;   /* angle / conformal */
  --f:       "Source Sans 3","Source Sans Pro","Noto Sans TC",Helvetica,Arial,sans-serif;

  /* names kept for anything still referencing the old palette */
  --bg-color: var(--bg);
  --panel-bg: var(--panel);
  --text-color: var(--txt);
  --muted-color: var(--faint);
  --border-color: var(--line);
  --accent-color: var(--txt);
}

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

body{
  margin:0; min-height:100vh;
  background:var(--bg); color:var(--txt);
  font-family:var(--f); font-weight:300; font-size:16px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
::selection{ background:rgba(255,255,255,.85); color:#191919; }
::-webkit-scrollbar{ width:9px; height:9px; }
::-webkit-scrollbar-track{ background:#191919; }
::-webkit-scrollbar-thumb{ background:#333; border-radius:9px; }

/* ---------- standalone chrome (hidden inside the modal) ---------- */
.demo-top{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:14px clamp(16px,4vw,40px);
  border-bottom:1px solid var(--line);
}
.demo-top a{ color:var(--dim); text-decoration:none; font-size:.92rem; transition:color .25s; }
.demo-top a:hover{ color:#fff; }
.demo-top a span{ display:inline-block; transition:transform .3s cubic-bezier(.22,.61,.36,1); }
.demo-top a:hover span{ transform:translateX(-3px); }
.demo-top .kicker{ font-size:.74rem; letter-spacing:.18em; text-transform:uppercase; color:var(--faint); }
html.embedded .demo-top{ display:none; }
html.embedded .header{ padding-bottom:10px; }
html.embedded .header h2{ display:none; }
html.embedded .header p{ margin:0; font-size:.88rem; }
html.embedded .scene-view{ height:clamp(230px,32vh,330px); }
html.embedded .controls{ gap:14px; }

/* ---------- shell ---------- */
.container{
  display:flex; flex-direction:column; gap:clamp(18px,2.6vw,28px);
  width:100%; max-width:1140px; margin-inline:auto;
  padding:clamp(20px,3vw,34px) clamp(16px,4vw,40px) clamp(40px,6vw,64px);
  background:none; border-radius:0; box-shadow:none;
}
html.embedded .container{ padding-block:clamp(14px,2vw,22px) clamp(20px,3vw,30px); }

.header{ text-align:left; padding-bottom:clamp(10px,1.6vw,16px); border-bottom:1px solid var(--line); }
.header h2{
  margin:0; font-weight:300; letter-spacing:-.02em; color:var(--txt);
  font-size:clamp(1.3rem,2.6vw,1.85rem);
}
.header p{ margin:8px 0 0; color:var(--faint); font-size:.95rem; }

/* ---------- viewports ---------- */
.viewports{
  display:grid; gap:clamp(14px,2vw,22px);
  grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));
  align-items:start;
}
.viewport-card{
  display:flex; flex-direction:column; align-items:stretch; gap:10px;
  min-width:0; max-width:none; flex:initial;
}
.viewport-card h3{
  margin:0; text-align:left; font-weight:400;
  font-size:.76rem; letter-spacing:.16em; text-transform:uppercase; color:var(--faint);
}
.scene-view{
  position:relative; width:100%;
  height:clamp(290px,44vh,440px); min-height:0;
  overflow:hidden; border:1px solid var(--line); border-radius:4px;
  background:var(--well); box-shadow:none;
}
.scene-view model-viewer,
.scene-view canvas{ display:block; width:100%; height:100%; }
model-viewer{ --poster-color:transparent; }

.status-overlay{
  position:absolute; inset:0; z-index:3;
  display:flex; align-items:center; justify-content:center; padding:24px;
  background:rgba(21,21,21,.93); color:var(--faint);
  font-size:.86rem; line-height:1.5; text-align:center;
}
.status-overlay.hidden{ display:none; }
.status-overlay.error{ color:#e07a7a; }

.legend{
  display:flex; align-items:center; gap:10px; width:100%;
  color:var(--faint); font-size:.74rem; visibility:hidden;
}
.legend-bar{
  flex:1; height:6px; border:0; border-radius:3px;
  background:linear-gradient(to right,rgb(25,70,180),rgb(50,210,230),rgb(255,230,80),rgb(210,50,45));
}

/* IEM badges */
.scene-badge-row{ display:flex; flex-wrap:wrap; gap:14px; }
.scene-badge{ display:inline-flex; align-items:center; gap:7px; font-size:.76rem; color:var(--faint); }
.badge-dot{ width:8px; height:8px; border-radius:50%; display:inline-block; }
.badge-dot.outer{ background:#7b8fd6; }
.badge-dot.subregion{ background:#f08a45; }
.viewport-caption{ margin:0; font-size:.78rem; color:var(--faint); line-height:1.5; }

/* ---------- controls ---------- */
.controls{
  display:flex; flex-direction:column; gap:clamp(14px,2vw,20px);
  padding:clamp(16px,2.2vw,22px);
  border:1px solid var(--line); border-radius:4px; background:var(--panel);
}
.control-group{ display:flex; flex-direction:column; gap:10px; min-width:0; }
.label-line{
  display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between; gap:8px 18px;
}
.label-line label,
.control-group > label{ color:var(--faint); }
.label-line strong,
.control-group > label strong,
.meter-head strong,
.optimization-gauge > strong,
.ratio-gauge > strong{
  font-weight:400; font-size:.76rem; letter-spacing:.16em;
  text-transform:uppercase; color:var(--faint);
}
.iteration-state,
.priority-state,
.balance-state{
  color:var(--txt); font-size:.9rem; font-weight:400;
  font-variant-numeric:tabular-nums; letter-spacing:.01em;
}
.priority-state{ align-self:center; text-align:center; }

/* range slider */
input[type="range"]{
  -webkit-appearance:none; appearance:none;
  width:100%; height:20px; background:transparent; cursor:pointer;
}
input[type="range"]::-webkit-slider-runnable-track{
  height:2px; border-radius:2px; background:rgba(255,255,255,.18);
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none;
  width:13px; height:13px; margin-top:-5.5px; border:0; border-radius:50%;
  background:var(--txt); transition:transform .2s ease, background .2s ease;
}
input[type="range"]:hover::-webkit-slider-thumb{ transform:scale(1.18); }
input[type="range"]:disabled::-webkit-slider-thumb{ background:rgba(255,255,255,.3); }
input[type="range"]::-moz-range-track{ height:2px; border-radius:2px; background:rgba(255,255,255,.18); }
input[type="range"]::-moz-range-thumb{
  width:13px; height:13px; border:0; border-radius:50%; background:var(--txt);
}
input[type="range"]:disabled{ cursor:default; }

.slider-scale{
  display:grid; grid-template-columns:1fr 1fr 1fr;
  margin-top:-4px; color:var(--faint); font-size:.74rem;
}
.slider-scale span:nth-child(2){ text-align:center; }
.slider-scale span:nth-child(3){ text-align:right; }

/* summary blocks */
.progress-summary,
.tradeoff-summary{
  display:grid; gap:12px;
  grid-template-columns:minmax(0,1fr) minmax(200px,1.1fr) minmax(0,1fr);
}
.energy-meter,
.optimization-gauge,
.heatmap-option,
.ratio-gauge,
.tradeoff-summary .ratio-gauge{
  padding:14px 16px; border:1px solid var(--line); border-radius:4px; background:transparent;
}
.optimization-gauge,
.ratio-gauge,
.heatmap-option{
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  text-align:center; gap:6px;
}
.meter-head{
  display:flex; align-items:baseline; justify-content:space-between; gap:10px;
  margin-bottom:11px; font-size:.9rem;
}
.meter-value{
  font-family:var(--f); font-variant-numeric:tabular-nums;
  font-size:1rem; color:var(--txt); white-space:nowrap;
}
.meter-track{ height:3px; overflow:hidden; border-radius:2px; background:rgba(255,255,255,.14); }
.meter-fill{ width:0; height:100%; border-radius:inherit; background:var(--txt); transition:width .15s ease; }
.area-meter .meter-fill{ background:var(--data-a); }
.angle-meter .meter-fill{ background:var(--data-b); }
.meter-caption{ margin-top:9px; color:var(--faint); font-size:.74rem; line-height:1.45; }

.gauge-canvas-wrap{ width:180px; height:56px; }
#optimizationGauge,#ratioGauge{ display:block; width:100%; height:100%; }
.gauge-scale{
  display:flex; width:180px; justify-content:space-between;
  margin-top:-2px; color:var(--faint); font-size:.68rem;
}
.gauge-value{ font-variant-numeric:tabular-nums; font-size:.95rem; color:var(--txt); }

.toggle-container{ display:flex; align-items:center; gap:10px; font-weight:400; font-size:.92rem; }
.toggle-container label{ cursor:pointer; }
input[type="checkbox"]{ width:15px; height:15px; accent-color:#f2f2f2; cursor:pointer; }
.heatmap-option small{ margin-top:2px; color:var(--faint); font-size:.76rem; line-height:1.45; }

select{
  width:100%; padding:9px 11px; font:inherit; font-size:.92rem;
  color:var(--txt); background:var(--well);
  border:1px solid var(--line); border-radius:4px;
}
select:disabled{ color:var(--faint); }

button{
  min-height:38px; padding:8px 14px; font:inherit; font-size:.86rem;
  color:var(--dim); background:transparent; cursor:pointer;
  border:1px solid var(--line); border-radius:4px;
  transition:color .25s, border-color .25s, background .25s;
}
button:hover:not(:disabled){ color:#000; background:#f2f2f2; border-color:#f2f2f2; }
button:disabled{ color:var(--faint); cursor:default; opacity:.6; }

.control-row{
  display:grid; grid-template-columns:minmax(200px,1fr) 190px minmax(200px,1fr);
  align-items:end; gap:16px;
}

.note{
  margin:0; padding-top:14px; border-top:1px solid var(--line);
  color:var(--faint); font-size:.85rem; line-height:1.55;
}

@media (max-width:820px){
  .progress-summary,
  .tradeoff-summary,
  .control-row{ grid-template-columns:1fr; }
  .scene-view{ height:clamp(260px,40vh,360px); }
}