/* M09K04 · Blackbody spectrum */
.bb-hero,.bb-foundation,.bb-lab-section,.bb-boundary{padding-block:clamp(4rem,8vw,7rem)}
.bb-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}
.bb-hero-copy{min-width:0}.bb-hero :is(h1,h2){font-size:clamp(3rem,7vw,6.35rem);line-height:.94;letter-spacing:-.055em;max-width:12ch;margin:.55rem 0 1.15rem}.bb-hero :is(h1,h2) em{font-style:normal;color:var(--warm)}.bb-hero p{max-width:76ch;color:var(--muted);font-size:clamp(1rem,1.5vw,1.16rem);line-height:1.7}.bb-hero-actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.6rem}
.bb-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}.bb-hero-card>span,.bb-card>span,.bb-boundary-grid article>span,.bb-control-head span,.bb-metric span,.bb-reading>span{display:block;color:var(--muted);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase}.bb-equation{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;font-size:clamp(.92rem,1.75vw,1.2rem);margin:.72rem 0;overflow-wrap:anywhere}.bb-equation.large{font-size:clamp(1.02rem,2.25vw,1.55rem);color:var(--warm)}.bb-mini-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem;margin-top:1.2rem}.bb-mini-grid div{border:1px solid var(--line);border-radius:.8rem;padding:.78rem;min-width:0}.bb-mini-grid span{display:block;color:var(--muted);font-size:.72rem}.bb-mini-grid strong{display:block;margin-top:.2rem;font-size:.9rem;overflow-wrap:anywhere}
.bb-foundation-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2rem}.bb-card{border:1px solid var(--line);border-radius:1rem;padding:1.25rem;background:var(--panel);min-width:0}.bb-card.primary{background:linear-gradient(145deg,color-mix(in srgb,var(--panel) 86%,var(--warm) 14%),var(--panel))}.bb-card h3{margin:.45rem 0 .55rem;font-size:1.12rem}.bb-card p,.bb-note p,.bb-boundary-grid p{color:var(--muted);line-height:1.62;margin:0}.bb-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}.bb-note strong{display:block;margin-bottom:.35rem}
.bb-lab-shell{display:grid;grid-template-columns:minmax(280px,.78fr) minmax(0,2.22fr);gap:1rem;align-items:start;margin-top:2rem}.bb-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}.bb-control-head{display:flex;justify-content:space-between;align-items:flex-start;gap:.8rem}.bb-control-head strong{display:block}.bb-status{padding:.28rem .55rem;border:1px solid var(--line);border-radius:999px;text-align:right;max-width:12rem}.bb-controls label{display:grid;grid-template-columns:1fr auto;gap:.35rem .6rem;align-items:center;min-width:0}.bb-controls label>span{font-size:.82rem}.bb-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}.bb-controls input{grid-column:1/-1;width:100%;min-width:0}.bb-presets{margin:0;padding:.72rem;border:1px solid var(--line);border-radius:.8rem;min-width:0}.bb-presets legend{padding:0 .3rem;color:var(--muted);font-size:.76rem}.bb-presets div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.45rem}.bb-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}.bb-presets button.is-active{border-color:var(--warm);box-shadow:inset 0 0 0 1px var(--warm)}.bb-assumption{padding:.78rem;border-radius:.72rem;background:var(--panel-solid)}.bb-assumption p{margin:.28rem 0 0;color:var(--muted);font-size:.8rem;line-height:1.5}
.bb-stage{min-width:0;display:grid;gap:1rem}.bb-metrics,.bb-check-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.65rem}.bb-metric,.bb-check-grid>div{border:1px solid var(--line);border-radius:.72rem;background:var(--panel);padding:.75rem;min-width:0}.bb-metric strong,.bb-check-grid strong{display:block;margin-top:.22rem;font-size:.84rem;overflow-wrap:anywhere}.bb-top-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.bb-panel,.bb-reading,.bb-boundary-grid article{border:1px solid var(--line);border-radius:1rem;background:var(--panel);padding:1rem;min-width:0}.bb-panel h3{margin:0 0 .65rem;font-size:1rem}.bb-panel svg{display:block;width:100%;height:auto;overflow:visible}.bb-reading>strong{display:block;margin:.35rem 0 .5rem}.bb-reading p{margin:0;color:var(--muted);line-height:1.62}.bb-boundary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2rem}.bb-boundary-grid strong{display:block;margin:.35rem 0 .45rem}.bb-upcoming{margin-top:clamp(3rem,7vw,6rem)}
.bb-svg-axis{stroke:var(--muted);stroke-width:1.5}.bb-svg-grid{stroke:var(--line);stroke-width:1}.bb-svg-main{fill:none;stroke:var(--accent);stroke-width:3}.bb-svg-compare{fill:none;stroke:var(--warm);stroke-width:2.5;stroke-dasharray:8 6}.bb-svg-wien{stroke:var(--accent-2);stroke-width:2;stroke-dasharray:6 5}.bb-svg-probe{stroke:var(--muted);stroke-width:2;stroke-dasharray:4 5}.bb-svg-marker{fill:var(--panel-solid);stroke:var(--accent);stroke-width:3}.bb-svg-label{fill:var(--text);font-size:15px;font-weight:700}.bb-svg-small{fill:var(--muted);font-size:12px}.bb-svg-accent{fill:var(--accent);font-size:13px;font-weight:700}.bb-svg-warm{fill:var(--warm);font-size:13px;font-weight:700}.bb-svg-violet{fill:var(--accent-2);font-size:13px;font-weight:700}
@media(max-width:1080px){.bb-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:980px){.bb-hero,.bb-lab-shell{grid-template-columns:1fr}.bb-controls{position:static}.bb-foundation-grid,.bb-boundary-grid,.bb-top-grid{grid-template-columns:1fr}}
@media(max-width:640px){.bb-hero{padding-top:2.5rem}.bb-hero :is(h1,h2){font-size:clamp(2.3rem,12vw,3.8rem)}.bb-mini-grid,.bb-metrics,.bb-check-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.bb-panel{padding:.65rem}.bb-controls{padding:.85rem}.bb-equation{font-size:.82rem}.bb-equation.large{font-size:.9rem}.bb-spectrum-svg,.bb-shape-svg{aspect-ratio:1.42}}
@media(max-width:380px){.bb-mini-grid,.bb-metrics,.bb-check-grid,.bb-presets div{grid-template-columns:1fr}.bb-controls output{max-width:8rem}.bb-hero :is(h1,h2),.bb-foundation .section-heading h2,.bb-boundary .section-heading h2{overflow-wrap:anywhere}}
.bb-controls,.bb-control-head,.bb-stage,.bb-panel,.bb-metrics,.bb-top-grid,.bb-foundation-grid,.bb-boundary-grid{min-width:0;max-width:100%}.bb-foundation .section-heading h2,.bb-boundary .section-heading h2{min-width:0;overflow-wrap:anywhere;word-break:break-word}