:root{--bg: #0d0d0d;--panel: #141414;--hairline: #262626;--text: #e6e4de;--muted: #6d6a63;--accent: #dd5a22;--accent-dim: #7a3a1c;--sans: "Helvetica Neue", Helvetica, Arial, "Inter", system-ui, sans-serif;--mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;overflow:hidden}#app{display:grid;grid-template-rows:auto 1fr auto;height:100vh;height:100dvh}#header{display:flex;align-items:flex-end;justify-content:space-between;padding:22px 28px 18px;border-bottom:1px solid var(--hairline)}.title-block h1{font-size:15px;font-weight:500;letter-spacing:.42em;text-indent:.42em}.subtitle{margin-top:6px;font-family:var(--mono);font-size:10.5px;letter-spacing:.04em;color:var(--muted)}#telemetry{display:flex;gap:30px}#telemetry div{text-align:right}#telemetry dt{font-family:var(--mono);font-size:9px;letter-spacing:.18em;color:var(--muted)}#telemetry dd{font-family:var(--mono);font-size:15px;font-weight:500;margin-top:3px;font-variant-numeric:tabular-nums}#stage{position:relative;overflow:hidden}#river{display:block;width:100%;height:100%}#hint{position:absolute;bottom:14px;left:50%;transform:translate(-50%);font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--muted);pointer-events:none;transition:opacity .6s ease}#hint.hidden{opacity:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}#third-faces{position:absolute;z-index:5;display:flex;flex-direction:column;gap:2px;border:0;padding:0;margin:0;background:transparent}#third-faces label{display:inline-flex;align-items:center;justify-content:center;color:var(--muted);cursor:pointer;line-height:0;opacity:.6;transition:color .15s ease,opacity .15s ease}#third-faces label:hover{color:var(--text);opacity:.85}#third-faces input:checked+label{color:var(--accent);opacity:1}#third-faces input:focus-visible+label{outline:1px solid var(--accent);outline-offset:2px}#tips-toggle{position:absolute;top:10px;right:12px;z-index:6;width:22px;height:22px;display:grid;place-items:center;font-family:var(--mono);font-size:11px;line-height:1;color:var(--accent);background:transparent;border:1px solid var(--accent);border-radius:0;cursor:pointer;opacity:.7;transition:opacity .15s ease,color .15s ease,border-color .15s ease}#tips-toggle:hover{opacity:1}#tips-toggle.off{color:var(--muted);border-color:var(--hairline)}[data-tip]{position:relative}[data-tip]:after{content:attr(data-tip);position:absolute;left:50%;bottom:calc(100% + 8px);transform:translate(-50%) translateY(4px);width:max-content;max-width:220px;padding:6px 8px;font-family:var(--mono);font-size:10px;line-height:1.35;letter-spacing:.01em;color:var(--text);background:var(--panel);border:1px solid var(--hairline);white-space:normal;text-align:left;pointer-events:none;opacity:0;z-index:50;transition:opacity .15s ease,transform .15s ease}[data-tip]:hover:after,[data-tip]:focus-within:after{opacity:1;transform:translate(-50%) translateY(0)}#third-faces [data-tip]:after{left:0;transform:translate(0) translateY(4px)}#third-faces [data-tip]:hover:after,#third-faces input:focus-visible+[data-tip]:after,#third-faces input:focus+[data-tip]:after{opacity:1;transform:translate(0) translateY(0)}body.tips-off [data-tip]:after{content:none}#controls{display:flex;align-items:center;gap:40px;padding:18px 28px;border-top:1px solid var(--hairline);background:var(--panel)}.transport{display:flex;gap:10px}.btn{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--text);background:transparent;border:1px solid var(--hairline);padding:9px 16px;cursor:pointer;transition:border-color .15s ease,color .15s ease,background .15s ease}.btn:hover{border-color:var(--muted)}.btn.active{color:var(--bg);background:var(--accent);border-color:var(--accent)}.params{display:flex;flex-wrap:wrap;gap:22px 40px;flex:1}.param{display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;column-gap:12px;align-items:center;min-width:150px;flex:1 1 180px}.param-label{grid-column:1;grid-row:1;font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:#b6b3aa}.param-val{grid-column:2;grid-row:1;justify-self:end;font-family:var(--mono);font-size:11px;color:var(--text);font-variant-numeric:tabular-nums}.param input[type=range]{grid-column:1 / 3;grid-row:2;margin-top:8px;-webkit-appearance:none;appearance:none;width:100%;height:1px;background:var(--hairline);cursor:pointer}.param input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:3px;height:14px;background:var(--accent);border:none;border-radius:0}.param input[type=range]::-moz-range-thumb{width:3px;height:14px;background:var(--accent);border:none;border-radius:0}@media (max-width: 860px){#controls{flex-direction:column;align-items:stretch;gap:18px}.params{flex-wrap:wrap;gap:18px 24px}#telemetry{gap:18px}}