:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color-scheme:light dark}*{box-sizing:border-box}body{margin:0;background:#111216}.page{--page:#f5f5f3;--surface:#fff;--surface-2:#eeeefa;--text:#18191d;--muted:#696b74;--line:#d9dae0;--track:#d8d4dc;--track-2:#e5e2e9;min-height:100vh;padding:72px 24px 36px;background:var(--page);color:var(--text);transition:background .25s ease,color .25s ease}.page[data-theme=dark]{--page:#111216;--surface:#1b1c21;--surface-2:#24252b;--text:#f4f4f7;--muted:#9a9ca6;--line:#32343c;--track:#0c0c0f;--track-2:#141419}.hero,.demo-card,footer{width:min(860px,100%);margin-inline:auto}.eyebrow{margin:0 0 14px;color:#9852d9;font-size:12px;font-weight:750;letter-spacing:.14em}.hero h1{max-width:720px;margin:0;font-size:clamp(44px,8vw,78px);font-weight:650;letter-spacing:-.055em;line-height:.98}.lede{max-width:650px;margin:22px 0 0;color:var(--muted);font-size:18px;line-height:1.55}.actions{display:flex;align-items:center;gap:18px;margin-top:28px}.actions a{color:var(--text);font-size:14px;font-weight:600;text-decoration:none}.actions .primary{padding:11px 16px;border-radius:22px;background:var(--text);color:var(--page)}.demo-card{margin-top:58px;padding:26px;border:1px solid var(--line);border-radius:24px;background:var(--surface);box-shadow:0 24px 60px #00000018}.demo-head{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:22px}.demo-head>div{display:flex;flex-direction:column;gap:3px}.label{color:var(--muted);font-size:13px}.demo-head strong{font-size:22px}.live{padding:5px 9px;border-radius:13px;background:var(--surface-2);color:var(--muted);font-size:11px}.rail-shell{padding:14px;border-radius:16px;background:var(--surface-2);overflow:hidden}.levels{display:flex;justify-content:space-between;margin-bottom:7px;padding:0 4px}.levels button{padding:0;border:0;background:transparent;color:var(--muted);font:inherit;font-size:12px;font-weight:550;cursor:pointer}.levels button.current{color:var(--text);font-weight:700}.track{position:relative;height:48px;overflow:hidden;border:1px solid var(--line);border-radius:14px;background:var(--track);isolation:isolate}.track-bg{position:absolute;inset:0;background:linear-gradient(135deg,var(--track-2),var(--track))}.dots{position:absolute;z-index:2;inset:0 23px;display:flex;align-items:center;justify-content:space-between}.dots i{width:5px;height:5px;border-radius:50%;background:var(--muted);opacity:.45}.is-max .dots{opacity:0}.nrs-energy{position:absolute;inset:0;z-index:3;width:100%;height:100%;opacity:var(--demo-opacity);mix-blend-mode:screen;pointer-events:none}.thumb{position:absolute;left:var(--demo-thumb-center);top:50%;z-index:5;width:44px;height:44px;border:.5px solid #00000014;border-radius:13px;background:linear-gradient(170deg,#fff,#eeeeef 52%,#dcdde0);box-shadow:0 2px 8px #0000004a,0 8px 16px #00000022;transform:translate(-50%,-50%);pointer-events:none}.track input{appearance:none;position:absolute;inset:0;z-index:7;width:100%;height:100%;margin:0;opacity:0;cursor:grab}.track input:active{cursor:grabbing}.track:has(input:focus-visible){outline:2px solid var(--demo-color);outline-offset:3px}.controls{display:flex;align-items:end;justify-content:space-between;flex-wrap:wrap;gap:20px;margin-top:20px}.controls fieldset{margin:0;padding:0;border:0}.controls legend,.color span{display:block;margin-bottom:7px;color:var(--muted);font-size:12px}.segmented{display:flex;padding:3px;border-radius:19px;background:var(--surface-2)}.segmented button{height:30px;padding:0 12px;border:0;border-radius:16px;background:transparent;color:var(--muted);font:inherit;font-size:12px;cursor:pointer}.segmented button.selected{background:var(--surface);color:var(--text);box-shadow:0 1px 4px #0000001a}.color{display:flex;flex-direction:column;align-items:flex-end}.color input{width:42px;height:34px;padding:3px;border:1px solid var(--line);border-radius:10px;background:var(--surface);cursor:pointer}footer{display:flex;justify-content:space-between;gap:20px;margin-top:22px;color:var(--muted);font-size:12px}@media(max-width:640px){.page{padding-top:44px}.demo-card{padding:18px;border-radius:20px}.controls,footer{align-items:stretch;flex-direction:column}.color{align-items:flex-start}.hero h1{font-size:48px}.track{height:44px}}@media(prefers-reduced-motion:reduce){.page{transition:none}}