:root{--bg:#faf9f6;--surface:#fff;--text:#1f1e1c;--text-secondary:#5f5e5a;--border:#0000001f;--border-strong:#00000040;--accent:#a81a32;--trail:#a81a32;--circle:#5f5e5a59;--arm:#5f5e5acc;--guide:#5f5e5a66;--pen:#1f1e1c;--radius:10px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#1a1a19;--surface:#232322;--text:#ecebe6;--text-secondary:#b4b2a9;--border:#ffffff1f;--border-strong:#ffffff47;--accent:#a81a32;--trail:#a81a32;--circle:#b4b2a94d;--arm:#b4b2a9bf;--guide:#b4b2a959;--pen:#ecebe6;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#1a1a19;--surface:#232322;--text:#ecebe6;--text-secondary:#b4b2a9;--border:#ffffff1f;--border-strong:#ffffff47;--accent:#a81a32;--trail:#a81a32;--circle:#b4b2a94d;--arm:#b4b2a9bf;--guide:#b4b2a959;--pen:#ecebe6;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}.page{max-width:720px;margin:0 auto;padding:2rem 16px 3rem}h1{margin:0 0 .5rem;font-size:1.75rem;font-weight:500}.lead,footer p{color:var(--text-secondary);margin:0 0 1.5rem}.formula{white-space:nowrap;font-family:ui-serif,Georgia,serif}.stage canvas{background:var(--surface);border:1px solid var(--border);border-radius:14px;width:100%;height:min(60vh,460px);display:block}.controls{margin:0 0 12px}.stage{margin:0 0 1.5rem}.slider-row{align-items:center;gap:12px;margin-top:12px;font-size:.9rem;display:flex}.slider-row label{color:var(--text-secondary);min-width:64px}.slider-row input{accent-color:var(--accent);flex:1;min-width:0}.slider-row button{min-width:84px}.slider-row output{text-align:right;font-variant-numeric:tabular-nums;min-width:40px;font-weight:500}.buttons{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;display:grid}.tri{color:var(--accent);font-weight:bolder}@media (width>=560px){.buttons{grid-template-columns:repeat(4,minmax(0,1fr))}}button{font:inherit;color:var(--text);border:1px solid var(--border-strong);border-radius:var(--radius);cursor:pointer;background:0 0;padding:.5rem .75rem;font-size:.9rem;transition:background .15s,border-color .15s}@media (hover:hover){button:hover{background:var(--border)}}button:active{transform:scale(.98)}button.on{border-color:var(--accent);color:var(--accent)}button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}footer p{font-size:.85rem}