html,body{height:100%}:root{--bg-1: #f3efe8;--bg-2: #e6eff5;--ink: #1b1d21;--muted: #5c6670;--accent: #d64a3a;--panel: #fffaf3;--line: #e3d9cd}*{box-sizing:border-box}body{margin:0;color:var(--ink);font-family:Avenir Next,Avenir,Gill Sans,Calibri,Trebuchet MS,sans-serif;background:radial-gradient(800px 500px at 10% 0%,#f9f2e9,#f9f2e900 70%),radial-gradient(700px 600px at 90% 20%,#e6f1f8,#e6f1f800 65%),linear-gradient(135deg,var(--bg-1),var(--bg-2));min-height:100vh}#root{min-height:100vh;display:grid;place-items:center;padding:32px 16px 48px}.shell{width:min(980px,100%);display:grid;gap:24px}header h1{margin:0 0 8px;letter-spacing:.02em;font-weight:700;font-size:clamp(28px,3.2vw,40px)}header p{margin:0;color:var(--muted);font-size:16px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 24px 60px #1b1d2114;animation:rise .52s ease-out}.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}label{display:grid;gap:6px;font-size:13px;color:var(--muted);letter-spacing:.02em}input{border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:15px;background:#fff;color:var(--ink)}input:focus{outline:2px solid rgba(214,74,58,.35);border-color:var(--accent)}.actions{margin-top:18px;display:flex;flex-wrap:wrap;gap:12px;align-items:center}button{background:var(--accent);color:#fff;border:none;border-radius:999px;padding:12px 20px;font-weight:600;letter-spacing:.03em;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease}button:hover{transform:translateY(-1px);box-shadow:0 10px 22px #d64a3a4d}.result{font-size:18px;font-weight:600}.status{color:var(--muted);font-size:14px}.track-controls{margin-bottom:14px;display:flex;justify-content:flex-end}.toggle-label{display:inline-flex;align-items:center;gap:10px;font-size:14px;color:var(--muted)}.toggle-label input{width:18px;height:18px;margin:0;padding:0}.result strong{color:var(--accent);font-size:22px}.track-frame{width:100%;height:360px;border-radius:16px;border:1px solid var(--line);background:#fffdf8}.track-layer path{transition:stroke .16s ease}.track-start-label{fill:var(--ink);font-size:12px;font-weight:700;letter-spacing:.04em}.track-meta{margin-top:12px;color:var(--muted);font-size:14px}.speed-legend{margin-top:14px}.speed-legend-title{font-size:13px;font-weight:600;color:var(--ink);margin-bottom:8px}.speed-legend-bar{height:14px;border-radius:999px;border:1px solid rgba(27,29,33,.12)}.speed-legend-scale{margin-top:6px;display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}.tooltip{position:fixed;z-index:10;background:#1b1d21eb;color:#fff;padding:8px 10px;border-radius:10px;font-size:12px;pointer-events:none;opacity:0;transform:translateY(-6px);transition:opacity .12s ease,transform .12s ease;white-space:nowrap}.tooltip.visible{opacity:1;transform:translateY(0)}@keyframes rise{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.preset-row{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px}.preset-row label{margin-right:12px}.preset-row select{border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:15px;background:#fff;color:var(--ink)}.preset-row select:focus{outline:2px solid rgba(214,74,58,.35);border-color:var(--accent)}.inputs-block{margin-top:14px}