:root{color-scheme:light;--bg:#fafafa;--fg:#243141;--muted:#586779;--line:#cbd2d9;--accent:#166a9b;--surface:#eef3f7;--low:#e8edf0;--high:#176793;font-family:system-ui,sans-serif;font-size:15px}
:root.dark{color-scheme:dark;--bg:#111827;--fg:#e5edf5;--muted:#adbdce;--line:#435166;--accent:#7ccaf2;--surface:#1d2b3e;--low:#26354a;--high:#84c8e8}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg)}main{padding:14px 16px;max-width:900px;margin:auto}h2{font-size:1.08rem;font-weight:500;margin:0 0 14px}.controls{display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin-bottom:10px;min-height:44px}label{display:flex;align-items:center;gap:9px}.slider{flex:1;min-width:170px;gap:10px}input[type=range]{accent-color:var(--accent);min-width:90px;width:100%;height:32px}select,button{font:inherit;color:var(--fg);background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:6px 9px;min-height:36px}select:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.orbital-panels{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:18px}.sphere-panel{position:relative;text-align:center}canvas{display:block;width:100%;height:auto}.north,.south{position:absolute;left:50%;transform:translateX(-50%);font-size:13px}.north{top:0}.south{bottom:68px}.color-key{display:flex;align-items:center;gap:8px;justify-content:center;margin:6px 0}.gradient{display:inline-block;width:100px;height:10px;background:linear-gradient(to right,var(--low),var(--high))}.plot{position:relative;width:100%;height:290px}.plot svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.plot-label{position:absolute;white-space:nowrap;transform:translate(-50%,-50%);font-size:12px;pointer-events:none}.plot-label.y-title{transform:translate(-50%,-50%) rotate(-90deg)}.formula{text-align:center;margin:10px 0;font-size:14px}.caption{font-size:13px;line-height:1.5;color:var(--muted);margin:10px 0 0}.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:13px}.legend>span{display:flex;align-items:center;gap:7px}.filled,.open{display:inline-block;width:10px;height:10px;border-radius:50%;border:2px solid var(--accent)}.filled{background:var(--accent)}.open{background:var(--bg)}.spectrum-plot{height:280px}.state-picker{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0}.state-picker button{min-width:38px;padding:5px 8px;cursor:pointer;font-size:14px}.state-picker button[aria-pressed=true]{border-color:var(--accent);box-shadow:inset 0 -2px var(--accent)}.selected{min-height:32px;font-size:14px}.katex{font-size:1em}.hit{cursor:pointer;fill:transparent;stroke:none}.hit:focus{outline:none;stroke:var(--accent);stroke-width:1;stroke-dasharray:3 3}.spectrum-plot svg{touch-action:pan-y}
@media(max-width:520px){main{padding:12px}.orbital-panels{grid-template-columns:1fr;gap:6px}.sphere-panel{width:220px;margin:auto}.profile-panel .plot{height:205px}.controls{gap:10px}.slider{min-width:160px}#count{font-size:13px}.spectrum-plot{height:270px}.legend{gap:10px;font-size:12px}.selected{font-size:13px;min-height:45px}h2{font-size:1rem}.caption{font-size:12px}.north,.south{font-size:12px}.south{bottom:60px}}

.sector{display:flex;gap:5px;flex-wrap:wrap}.sector button{font-size:13px;cursor:pointer}.sector button[aria-pressed=true]{border-color:var(--accent);box-shadow:inset 0 -2px var(--accent)}
.slider>span{flex-shrink:0;white-space:nowrap}.sphere-panel{max-width:340px;margin:auto;width:100%}.plot-label .katex{white-space:nowrap}.color-key .katex{font-size:13px}
@media(max-width:520px){.sphere-panel{width:200px}.profile-panel .plot{height:190px}.controls>.slider{flex-basis:100%;min-width:0}.controls>#count{margin-top:-6px}.plot-label{font-size:12px}}