/* M09K03 · Thermal radiation */
.th-hero,.th-foundation,.th-lab-section,.th-boundary{padding-block:clamp(4rem,8vw,7rem)}
.th-hero{scroll-margin-top:calc(var(--header-h) + 24px);display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);gap:clamp(2rem,5vw,5rem);align-items:center}
.th-hero-copy{min-width:0}.th-hero :is(h1,h2){font-size:clamp(3rem,7vw,6.4rem);line-height:.94;letter-spacing:-.055em;max-width:12ch;margin:.55rem 0 1.15rem}.th-hero :is(h1,h2) em{font-style:normal;color:var(--warm)}.th-hero p{max-width:74ch;color:var(--muted);font-size:clamp(1rem,1.5vw,1.16rem);line-height:1.7}.th-hero-actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.6rem}
.th-hero-card{border:1px solid var(--line);border-radius:1.35rem;padding:clamp(1.25rem,3vw,2rem);background:linear-gradient(160deg,color-mix(in srgb,var(--panel) 91%,var(--warm) 9%),var(--panel));box-shadow:var(--shadow);min-width:0}.th-hero-card>span,.th-card>span,.th-boundary-grid article>span,.th-control-head span,.th-metric span,.th-reading>span{display:block;color:var(--muted);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase}.th-equation{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;font-size:clamp(1rem,2.1vw,1.35rem);margin:.72rem 0;overflow-wrap:anywhere}.th-equation.large{font-size:clamp(1.5rem,3.4vw,2.35rem);color:var(--warm)}.th-mini-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem;margin-top:1.2rem}.th-mini-grid div{border:1px solid var(--line);border-radius:.8rem;padding:.78rem;min-width:0}.th-mini-grid span{display:block;color:var(--muted);font-size:.72rem}.th-mini-grid strong{display:block;margin-top:.2rem;font-size:.94rem;overflow-wrap:anywhere}
.th-foundation-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2rem}.th-card{border:1px solid var(--line);border-radius:1rem;padding:1.25rem;background:var(--panel);min-width:0}.th-card.primary{background:linear-gradient(145deg,color-mix(in srgb,var(--panel) 86%,var(--warm) 14%),var(--panel))}.th-card h3{margin:.45rem 0 .55rem;font-size:1.12rem}.th-card p,.th-note p,.th-boundary-grid p{color:var(--muted);line-height:1.62;margin:0}.th-note{margin-top:1rem;border-left:3px solid var(--warm);padding:1rem 1.15rem;background:color-mix(in srgb,var(--panel) 80%,transparent);border-radius:0 .8rem .8rem 0}.th-note strong{display:block;margin-bottom:.35rem}
.th-lab-shell{display:grid;grid-template-columns:minmax(280px,.78fr) minmax(0,2.22fr);gap:1rem;align-items:start;margin-top:2rem}.th-controls{position:sticky;top:92px;display:grid;gap:.82rem;padding:1rem;border:1px solid var(--line);border-radius:1rem;background:var(--panel);min-width:0}.th-control-head{display:flex;justify-content:space-between;align-items:flex-start;gap:.8rem}.th-control-head strong{display:block}.th-status{padding:.28rem .55rem;border:1px solid var(--line);border-radius:999px;text-align:right;max-width:11rem}.th-controls label{display:grid;grid-template-columns:1fr auto;gap:.35rem .6rem;align-items:center;min-width:0}.th-controls label>span{font-size:.82rem}.th-controls output{font:600 .78rem/1.2 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;color:var(--warm);max-width:10rem;text-align:right;overflow-wrap:anywhere}.th-controls input{grid-column:1/-1;width:100%;min-width:0}.th-presets{margin:0;padding:.72rem;border:1px solid var(--line);border-radius:.8rem;min-width:0}.th-presets legend{padding:0 .3rem;color:var(--muted);font-size:.76rem}.th-presets div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.45rem}.th-presets button{min-width:0;padding:.58rem .48rem;border:1px solid var(--line);border-radius:.62rem;background:var(--panel-solid);color:var(--text);cursor:pointer}.th-presets button.is-active{border-color:var(--warm);box-shadow:inset 0 0 0 1px var(--warm)}.th-assumption{padding:.78rem;border-radius:.72rem;background:var(--panel-solid)}.th-assumption p{margin:.28rem 0 0;color:var(--muted);font-size:.8rem;line-height:1.5}
.th-stage{min-width:0;display:grid;gap:1rem}.th-metrics,.th-check-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.65rem}.th-metric,.th-check-grid>div{border:1px solid var(--line);border-radius:.72rem;background:var(--panel);padding:.75rem;min-width:0}.th-metric strong,.th-check-grid strong{display:block;margin-top:.22rem;font-size:.84rem;overflow-wrap:anywhere}.th-top-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.th-panel,.th-reading,.th-boundary-grid article{border:1px solid var(--line);border-radius:1rem;background:var(--panel);padding:1rem;min-width:0}.th-panel h3{margin:0 0 .65rem;font-size:1rem}.th-panel svg{display:block;width:100%;height:auto;overflow:visible}.th-reading>strong{display:block;margin:.35rem 0 .5rem}.th-reading p{margin:0;color:var(--muted);line-height:1.62}.th-boundary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2rem}.th-boundary-grid strong{display:block;margin:.35rem 0 .45rem}.th-upcoming{margin-top:clamp(3rem,7vw,6rem)}
.th-svg-axis{stroke:var(--muted);stroke-width:1.5}.th-svg-grid{stroke:var(--line);stroke-width:1}.th-svg-blackbody{fill:none;stroke:var(--accent);stroke-width:3}.th-svg-grey{fill:none;stroke:var(--warm);stroke-width:3}.th-svg-linear{fill:none;stroke:var(--muted);stroke-width:2;stroke-dasharray:7 6}.th-svg-current{stroke:var(--accent-2);stroke-width:2;stroke-dasharray:7 6}.th-svg-marker{fill:var(--panel-solid);stroke:var(--warm);stroke-width:3}.th-svg-label{fill:var(--text);font-size:16px;font-weight:700}.th-svg-small{fill:var(--muted);font-size:13px}.th-svg-accent{fill:var(--accent);font-size:14px;font-weight:700}.th-svg-warm{fill:var(--warm);font-size:14px;font-weight:700}.th-svg-violet{fill:var(--accent-2);font-size:14px;font-weight:700}
@media(max-width:1080px){.th-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:980px){.th-hero,.th-lab-shell{grid-template-columns:1fr}.th-controls{position:static}.th-foundation-grid,.th-boundary-grid,.th-top-grid{grid-template-columns:1fr}}
@media(max-width:640px){.th-hero{padding-top:2.5rem}.th-hero :is(h1,h2){font-size:clamp(2.3rem,12vw,3.8rem)}.th-mini-grid,.th-metrics,.th-check-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.th-panel{padding:.68rem}.th-controls{padding:.85rem}.th-equation{font-size:.84rem}.th-equation.large{font-size:.98rem}.th-exitance-svg,.th-sensitivity-svg{aspect-ratio:1.38}}
@media(max-width:380px){.th-mini-grid,.th-metrics,.th-check-grid,.th-presets div{grid-template-columns:1fr}.th-controls output{max-width:8rem}.th-hero :is(h1,h2),.th-foundation .section-heading h2,.th-boundary .section-heading h2{overflow-wrap:anywhere}}
.th-controls,.th-control-head,.th-stage,.th-panel,.th-metrics,.th-top-grid,.th-foundation-grid,.th-boundary-grid{min-width:0;max-width:100%}.th-foundation .section-heading h2,.th-boundary .section-heading h2{min-width:0;overflow-wrap:anywhere;word-break:break-word}