:root{color-scheme:dark;--bg:#0a0a0a;--panel:#111;--line:#252525;--text:#ececec;--muted:#777;--soft:#aaa}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--soft);font-family:'DM Mono',monospace}.site-header{max-width:1500px;margin:auto;padding:24px 28px;display:flex;justify-content:space-between}.back{color:var(--muted);text-decoration:none;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}.shell{max-width:1500px;margin:auto;padding:20px 28px 50px}.intro{max-width:850px;margin-bottom:30px}.eyebrow{font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:#555}.intro h1{font-family:'Instrument Serif',serif;font-size:clamp(2.6rem,5vw,5.2rem);font-weight:400;line-height:.96;color:var(--text);margin:.5rem 0 1rem}.intro p:last-child{line-height:1.8;color:var(--muted);max-width:760px}.workspace{display:grid;grid-template-columns:minmax(275px,330px) minmax(470px,1fr) minmax(270px,330px);gap:16px;align-items:start}.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:20px;min-width:0}.panel h2{font-family:'Instrument Serif',serif;color:var(--text);font-weight:400;font-size:1.65rem;margin:0 0 18px}.panel h3{font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:#666;margin:18px 0 8px}fieldset{border:0;padding:0;margin:0 0 22px}legend{font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;color:#555;margin-bottom:10px}label{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:7px 0;font-size:.72rem;color:#858585}input,select,button{font:inherit}input[type=number],select{background:#0d0d0d;color:var(--text);border:1px solid #2b2b2b;border-radius:4px;padding:7px}input[type=number]{width:78px;text-align:right}select{width:132px}input[type=range]{width:110px}button{background:#181818;color:var(--text);border:1px solid #333;border-radius:5px;padding:8px 13px;cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}.validation{font-size:.68rem;line-height:1.6;border-top:1px solid var(--line);padding-top:12px}.validation.valid{color:#858585}.validation.valid::before{content:'Inputs are within the model range.'}.validation.invalid{color:#d49b9b}.visual-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.visual-header .controls{display:flex;align-items:center;gap:12px;font-size:.67rem;color:#777}.views{display:grid;grid-template-columns:1fr 1fr;gap:12px}.view-card{border:1px solid #202020;border-radius:6px;padding:10px;background:#0d0d0d}.view-card p{font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;color:#555;margin:0 0 6px}.view-card svg{width:100%;height:auto;display:block}.structure{stroke:#777;stroke-width:7;stroke-linecap:round}.torso-axis{stroke:#3e3e3e;stroke-width:14;stroke-linecap:round}.arm-segment{stroke:#c6c6c6;stroke-width:12;stroke-linecap:round}.arm-segment.right{stroke:#727272;stroke-width:10}.joint{fill:#111;stroke:#ddd;stroke-width:3}.hand{fill:#aaa}.torso-top{fill:#161616;stroke:#555;stroke-width:3}.yaw-arrow{stroke:#bbb;stroke-width:3}.trace{fill:none;stroke-width:2}.trace.legs{stroke:#666}.trace.arms{stroke:#bdbdbd}.trace.residual{stroke:#f0f0f0;stroke-width:3}.trace-zero{stroke:#292929;stroke-width:1}.trace-cursor{stroke:#777;stroke-width:1}.legend{display:flex;gap:14px;font-size:.6rem;color:#666;margin-top:5px}.legend span::before{content:'—';margin-right:4px}.results dl{display:grid;grid-template-columns:1fr auto;margin:0}.results dt,.results dd{font-size:.66rem;padding:8px 0;border-bottom:1px solid #1f1f1f}.results dt{color:#666}.results dd{margin:0;color:var(--text);text-align:right}.suggestion{margin-top:18px;padding:14px;border:1px solid #292929;border-radius:6px;font-size:.68rem;line-height:1.7;color:#888}.suggestion strong{color:var(--text);font-weight:400}.suggestion span{color:#666}.note{font-size:.62rem;line-height:1.7;color:#555;margin-top:18px}@media(max-width:1100px){.workspace{grid-template-columns:310px 1fr}.results{grid-column:1/-1}}@media(max-width:760px){.site-header,.shell{padding-left:16px;padding-right:16px}.workspace{grid-template-columns:1fr}.results{grid-column:auto}.views{grid-template-columns:1fr}.visual-header{display:block}.visual-header .controls{margin-bottom:12px;justify-content:space-between}.visual{order:1}.inputs{order:2}.results{order:3}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
