@font-face{font-family:Inter;src:url('/assets/inter-400.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:Inter;src:url('/assets/inter-500.woff2') format('woff2');font-weight:500;font-display:swap}

/* Match the 13–15px UI scale in wavelength.css, dose.css and room-program.css.
   Notes remain secondary; responsive layouts wrap instead of shrinking text. */
:root{
  font-family:Inter,Arial,sans-serif;font-size:100%;font-synthesis:none;
  color:#172125;background:#f7f8f8;
  --ink:#172125;--muted:#566267;--note:#5f6c71;--line:#dce1e2;--cyan:#007faa;
  --type-note:.75rem;--type-meta:.8125rem;--type-control:.875rem;--type-heading:.9375rem;
}
*{box-sizing:border-box}
body{margin:0;font-size:var(--type-control);line-height:1.5;-webkit-font-smoothing:antialiased}
button,input{font:inherit}
button{color:inherit;cursor:pointer;touch-action:manipulation;border-radius:0}
button:disabled{cursor:default;opacity:.4}
button:focus-visible,summary:focus-visible,input:focus-visible,canvas:focus-visible{outline:2px solid #00769e;outline-offset:4px}
button:hover:not(:disabled){color:#006d91}
[hidden]{display:none!important}

.study{max-width:1600px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1.72fr) minmax(290px,1fr);column-gap:40px;align-items:start;padding:8px 2px 16px}
.room-panel{min-width:0}
.scene-top{min-height:48px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:8px 16px}
.room-size{font-size:var(--type-meta);line-height:1.4;color:var(--muted)}
.room-size span{color:var(--note);margin:0 5px}
.view-tools{display:flex;gap:14px;flex-shrink:0}
.view-tools button{background:none;border:0;padding:10px 0;min-height:44px;font-size:var(--type-control);color:var(--muted);white-space:nowrap}
.view-tools button[aria-pressed=true]{color:#00749a;text-decoration:underline;text-underline-offset:5px}
.viewport{position:relative;height:530px;isolation:isolate}
.viewport canvas{display:block;width:100%;height:100%;touch-action:none;cursor:crosshair}
.viewport.orbit canvas{cursor:grab}
.viewport.orbit canvas:active,.viewport.dragging canvas{cursor:grabbing!important}
.scene-notice{position:absolute;top:8px;left:50%;transform:translateX(-50%);padding:8px 12px;background:rgba(255,255,255,.95);color:#405259;font-size:var(--type-meta);line-height:1.4;border:1px solid #dce1e2;pointer-events:none;width:max-content;max-width:95%;text-align:center}
.scene-notice.running{border-left:2px solid #007faa}
#loading{position:absolute;inset:40% 0 auto;text-align:center;color:var(--muted);font-size:var(--type-control)}
.loading-dot{display:inline-block;width:7px;height:7px;background:#009bcd;border-radius:50%;margin-right:8px}

.scene-bottom{position:relative;border-top:1px solid var(--line);padding-top:6px;display:flex;align-items:center;gap:4px 16px;flex-wrap:wrap}
.coverage-key{display:flex;gap:16px;flex-wrap:wrap}
.coverage-key span{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:var(--type-meta);white-space:nowrap;min-height:36px}
.coverage-key i,.coverage-legend i{width:8px;height:8px;border-radius:50%;display:block;flex-shrink:0}
.key-shadow{background:#97a3a9}
.key-reached{background:#35bfff;box-shadow:0 0 0 1px #35bfff33}
.ray-toggle{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:var(--type-meta);white-space:nowrap;min-height:36px;cursor:pointer}
.ray-toggle input{accent-color:#007ea6;width:15px;height:15px;margin:0}
.scene-guide{margin-left:auto;font-size:var(--type-meta);color:var(--muted)}
.scene-guide summary{cursor:pointer;white-space:nowrap;padding:8px 0;min-height:36px}
.scene-guide-copy{position:absolute;z-index:5;right:0;bottom:calc(100% + 8px);width:340px;max-width:100%;padding:14px 16px;background:#fff;border:1px solid var(--line);box-shadow:0 4px 18px #17212512}
.scene-guide-copy p,.scene-guide-copy .scene-help{font-size:var(--type-control);line-height:1.6;color:var(--muted);margin:0}
.scene-guide-copy p+p{margin-top:8px}
.top-view-key{font-size:var(--type-control);line-height:1.6;color:#405660;margin:8px 0 0}
.surface-readout{position:absolute;bottom:16px;left:16px;width:max-content;max-width:calc(100% - 32px);background:#fff;padding:10px 13px;border:1px solid var(--line);border-left:2px solid #0087b2;font-size:var(--type-control);line-height:1.5;pointer-events:none}
.surface-readout strong{display:block;font-weight:500}
.surface-readout span{color:var(--muted);font-size:var(--type-meta)}

.program{min-width:0;border-top:1px solid var(--line);padding-top:14px}
.coverage-results{border-bottom:1px solid var(--line);padding:0 0 12px;margin:0}
.coverage-results h2{font-size:var(--type-heading);font-weight:500;line-height:1.5;margin:0;color:var(--ink)}
.coverage-number{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:10px 0 12px}
.coverage-number strong{font-size:2.75rem;font-weight:400;line-height:1;letter-spacing:-.045em;color:#006f96;font-variant-numeric:tabular-nums;white-space:nowrap}
.coverage-number>span{font-size:var(--type-meta);line-height:1.45;color:var(--muted);text-align:right;max-width:150px}
.coverage-bar{display:flex;overflow:hidden;height:9px;background:#97a3a9}
.coverage-bar span{height:100%}
#bar-reached{background:#35bfff}
#bar-shadow{background:#97a3a9}
.coverage-legend{list-style:none;padding:0;display:flex;justify-content:space-between;gap:6px 12px;flex-wrap:wrap;margin:10px 0 8px}
.coverage-legend li{display:flex;align-items:center;gap:6px;font-size:var(--type-meta);color:var(--muted)}
.coverage-legend b{font-weight:500;color:#263f4a;font-variant-numeric:tabular-nums}
.coverage-scope{font-size:var(--type-note);line-height:1.5;color:var(--note);margin:0}
.coverage-results[aria-busy=true] .coverage-bar,.coverage-results[aria-busy=true] .coverage-legend{opacity:.35}

.layout-actions{display:flex;align-items:center;justify-content:space-between;gap:8px 16px;flex-wrap:wrap;margin:4px 0 8px}
.layout-actions button{border:0;background:none;font-size:var(--type-control);line-height:1.4;min-height:40px;padding:8px 0;text-decoration:underline;text-underline-offset:4px;color:#405d69;text-align:left}
.run{display:flex;gap:12px;width:100%;justify-content:space-between;align-items:center;border:0;background:#14232a;color:#fff;font-size:var(--type-control);font-weight:500;line-height:1.4;padding:13px 16px;min-height:48px;text-align:left}
.run:hover:not(:disabled){background:#20404d;color:#fff}
.run:disabled{opacity:.55}
.run.busy>#run-icon{width:16px;height:16px;box-sizing:border-box;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;font-size:0;animation:run-spin .8s linear infinite}
@keyframes run-spin{to{transform:rotate(360deg)}}
@keyframes run-pulse{50%{opacity:.3}}
@media(prefers-reduced-motion:reduce){.run.busy>#run-icon{animation:run-pulse 1.6s ease-in-out infinite}}
.run>span:last-child{font-size:18px;font-weight:400;flex-shrink:0}
.walkthrough-controls{padding-top:6px}
.walkthrough-step{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:var(--type-meta);color:var(--muted);font-variant-numeric:tabular-nums}
.walkthrough-step>span{text-align:center}
.walkthrough-controls button{border:0;background:none;font-size:var(--type-control);line-height:1.4;padding:8px 0;min-height:40px;color:#405d69;white-space:nowrap}
.walkthrough-controls>button{display:block;margin:0 auto;text-decoration:underline;text-underline-offset:3px}
.positions{margin-top:16px}
.point-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:10px}
.point-heading h2{font-size:var(--type-heading);font-weight:500;line-height:1.5;margin:0}
.point-heading>span{font-size:var(--type-control);color:var(--muted);white-space:nowrap}
.point-heading strong{color:var(--ink);font-weight:500}
/* One row of square tiles, one per point (max 6), so a point can be removed with × (Vivian, 5 Oct). */
.point-list{display:grid;grid-template-columns:repeat(6,minmax(0,56px));gap:6px;margin:0;padding:0;list-style:none}
.point-list li{position:relative;aspect-ratio:1;min-width:0;border:1px solid var(--line)}
.point-select{display:grid;place-items:center;width:100%;height:100%;border:0;background:none;padding:0;color:var(--muted)}
.point-select .number{display:grid;place-items:center;width:24px;height:24px;border:1px solid #a9bcc3;border-radius:50%;font-size:var(--type-meta);line-height:1;color:#405d69}
.point-list li.active{border-color:#89bbcc;background:#eff7f9}
.point-list li.active .number{background:#087fa6;color:#fff;border-color:#087fa6}
.point-name{display:none}
.remove-point{position:absolute;top:0;right:0;display:grid;place-items:center;width:24px;height:24px;padding:0;border:0;background:none;font-size:16px;line-height:1;color:var(--muted)}
.remove-point:hover:not(:disabled){color:var(--ink)}
.point-list .empty-list{grid-column:1/-1;aspect-ratio:auto;display:flex;align-items:center;min-height:56px;box-sizing:border-box;padding:6px 12px;font-size:var(--type-control);line-height:1.4;color:var(--muted);border:1px dashed var(--line)}
.selected-point{font-size:var(--type-control);font-weight:500;line-height:1.5;margin:8px 0 0;color:#385967;min-height:21px}
.status{font-size:var(--type-meta);color:var(--muted);line-height:1.5;margin:10px 0 0;min-height:20px}

@media(min-width:1350px){.viewport{height:550px}}
@media(max-width:999px){
  .study{column-gap:25px;grid-template-columns:minmax(0,1.35fr) minmax(285px,1fr)}
  .viewport{height:520px}.view-tools{gap:12px}.scene-top{gap:8px 12px}
}
@media(max-width:749px){
  .study{display:block;padding:0 2px 14px}.viewport{height:360px}
  .program{margin-top:12px;padding-top:14px}.coverage-number strong{font-size:2.375rem}
  .positions{margin-top:12px}
}
@media(max-width:430px){.viewport{height:310px}.scene-bottom{column-gap:12px}.coverage-key{gap:12px}}

#room-plan{position:absolute;inset:0}
.viewport:has(#room-plan:not([hidden])){background:radial-gradient(ellipse at center,#edf1f1 0%,#f7f8f8 72%)}
.coverage-results.final-reveal{border-color:#35bfff}
.final-reveal .coverage-number strong{color:#0089c2;animation:coverage-finale .9s ease-out both;transform-origin:left center}
@keyframes coverage-finale{0%{opacity:.45;transform:scale(.94)}60%{opacity:1;transform:scale(1.08)}100%{transform:scale(1)}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}.final-reveal .coverage-number strong{animation:none}.final-reveal .coverage-bar{transition:none}}