.rt-lab{--ink:#173343;--muted:#607681;--blue:#176b9a;--orange:#c86b30;--teal:#008875;color:var(--ink);max-width:1380px;margin:auto;padding:12px 12px 60px}.rt-back{color:var(--muted);text-decoration:none;font-size:14px}.rt-intro{padding:30px 0 25px}.rt-eyebrow{font-size:12px;letter-spacing:.09em;color:var(--teal);font-weight:700}.rt-intro h2{font-size:clamp(26px,3.5vw,42px);border:0;margin:10px 0}.rt-intro p{color:var(--muted);margin-bottom:18px}.rt-equation{font-family:Georgia,serif;font-size:clamp(17px,2vw,25px);padding:16px 22px;background:#edf5f7;border-left:3px solid var(--blue);border-radius:0 10px 10px 0}.rt-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start}.rt-controls{background:#f3f6f6;border:1px solid #dce6e8;padding:20px;border-radius:14px;display:grid;gap:15px}.rt-controls label{font-size:13px;display:grid;gap:6px;font-weight:600}.rt-lab input:not([type=checkbox]),.rt-lab select{width:100%;border:1px solid #ccdadd;border-radius:7px;background:white;padding:8px;color:var(--ink);font-size:14px;min-width:0}.rt-lab input[type=range]{padding:0;accent-color:var(--blue)}.rt-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px}.rt-lab button{border:1px solid #cbdadd;border-radius:8px;background:white;color:var(--ink);padding:9px 13px;font-size:14px;cursor:pointer}.rt-lab button:hover{border-color:var(--blue);background:#eef6fa}.rt-lab button:disabled{opacity:.4;cursor:default}.rt-lab .rt-primary{background:var(--blue);color:white;border-color:var(--blue)}.rt-lab button:focus-visible,.rt-lab input:focus-visible,.rt-lab select:focus-visible{outline:3px solid #64bad2;outline-offset:2px}.rt-presets{display:grid;gap:6px}.rt-presets button{font-size:12px}.rt-note{font-size:12px;color:var(--muted);line-height:1.65;margin:0}.rt-rule{font-size:14px;padding-top:14px;border-top:1px solid #d8e4e6;line-height:1.8}.rt-controls .rt-check{display:flex;align-items:center;gap:8px}.rt-main{min-width:0}.rt-panel{border:1px solid #dce6e8;border-radius:14px;background:white;padding:22px}.rt-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.rt-lab h3{font-size:20px;border:0;margin:5px 0 8px}.rt-heading #rt-badge{background:#e5f3ed;padding:5px 9px;border-radius:20px;font-size:12px;white-space:nowrap}#rt-chart svg{width:100%;height:auto;display:block;overflow:visible}#rt-chart{margin-top:8px;min-height:230px}.rt-legend{display:flex;gap:20px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin:5px 0 15px}.rt-legend span:before{content:'';display:inline-block;width:16px;height:3px;margin-right:6px;vertical-align:middle;background:var(--blue)}.rt-legend .point:before{background:var(--orange)}.rt-legend .aux:before{background:var(--teal)}.rt-explain{background:#f2f7fa;border-radius:8px;padding:13px 16px;font-size:14px;line-height:1.8;min-height:83px}.rt-playback{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.rt-scrub-label{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted);margin-top:15px}.rt-scrub-label input{flex:1}.rt-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0}.rt-stats>div{padding:15px 18px;background:#edf5f7;border-radius:10px;min-width:0}.rt-stats span{font-size:12px;color:var(--muted);display:block}.rt-stats strong{display:block;font-size:clamp(16px,1.8vw,23px);margin-top:5px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.rt-table-wrap{max-height:250px;overflow:auto}.rt-history table{width:100%;font-size:13px;font-variant-numeric:tabular-nums;border-collapse:collapse;margin:10px 0}.rt-history th,.rt-history td{text-align:right;padding:8px;border-bottom:1px solid #e6eef0;white-space:nowrap}.rt-history th{background:#f4f7f8;position:sticky;top:0}.rt-history tr:last-child td{background:#eef7f7}#rt-error{color:#b53b2d;font-size:13px;margin:0}svg text{font-family:system-ui,sans-serif}@media(max-width:850px){.rt-layout{grid-template-columns:1fr}.rt-controls{grid-template-columns:1fr 1fr}.rt-rule,.rt-note,#rt-error{grid-column:1/-1}.rt-controls .rt-presets{align-content:start}.rt-panel{padding:14px}.rt-stats{gap:7px}.rt-stats>div{padding:10px}.rt-intro{padding-top:20px}}@media(prefers-reduced-motion:reduce){.rt-lab *{scroll-behavior:auto!important}}

/* Compact lecture view: the figure and its results form one panel. */
.rt-intro{padding:18px 0}.rt-equation{font-size:clamp(18px,2vw,24px)}
.rt-controls{gap:12px}.rt-controls #rt-error:empty{display:none}
#rt-chart{margin-top:0}.rt-legend{font-size:15px;margin-bottom:12px}
.rt-panel>.rt-stats{margin:10px 0 14px}.rt-stats span{font-size:14px}
.rt-stats strong{font-size:clamp(19px,2vw,25px)}
.rt-playback{margin-top:12px}.rt-scrub-label{font-size:14px}