:root{
  --ink:#173e4d;--muted:#66808a;--teal:#2f829c;--teal-dark:#216477;--teal-soft:#e9f4f5;
  --blue:#315fc7;--purple:#7750c9;--orange:#e98a20;--orange-soft:#fff1dd;--green:#278b68;
  --line:#c8dadd;--paper:#fff;--page:#f1f7f7;--shadow:0 16px 44px rgba(31,71,82,.12);
}
*{box-sizing:border-box}
body{margin:0;min-width:320px;color:var(--ink);background:linear-gradient(rgba(47,130,156,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(47,130,156,.035) 1px,transparent 1px),var(--page);background-size:32px 32px;font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",system-ui,sans-serif}
button,input{font:inherit}
.page-shell{width:min(1400px,calc(100% - 32px));margin:0 auto;padding:32px 0 52px}
.page-header{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;margin-bottom:22px;padding:0 4px}
.eyebrow{display:block;color:var(--orange);font-size:15px;font-weight:850;letter-spacing:.12em;margin-bottom:8px}
h1{font-size:clamp(32px,3.8vw,52px);line-height:1.08;margin:0 0 10px;letter-spacing:-.035em}
.page-header p{margin:0;color:var(--muted);font-size:17px}
.header-actions{display:flex;flex-direction:column;align-items:flex-end;gap:9px}.model-tags{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
.model-tags span{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.78);font-size:14px;font-weight:750}
.round-links{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.experiment-link{padding:9px 13px;border-radius:999px;background:var(--teal);color:#fff;text-decoration:none;font-size:13px;font-weight:850}.experiment-link.light{background:#fff;color:var(--teal-dark);border:1px solid var(--line)}.experiment-link:hover{background:var(--teal-dark);color:#fff}
.workspace{display:grid;grid-template-columns:330px minmax(0,1fr);gap:20px;align-items:start}
.control-panel,.experiment-panel,.data-panel,.conclusion-strip{background:var(--paper);border:1px solid rgba(152,184,190,.68);box-shadow:var(--shadow);border-radius:22px}
.control-panel{padding:21px;position:sticky;top:16px}
.experiment-panel{padding:19px;min-width:0}
.section-title{display:flex;align-items:center;gap:11px}
.step-number{display:grid;place-items:center;flex:0 0 auto;width:38px;height:38px;border-radius:12px;background:var(--orange-soft);color:var(--orange);font-size:14px;font-weight:900}
h2{font-size:20px;margin:0}.section-title p{margin:4px 0 0;color:var(--muted);font-size:13px}
.range-control{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:22px 0 10px;color:var(--muted);font-size:14px}
.range-control strong{color:var(--ink);font-size:17px;white-space:nowrap}
input[type=range]{width:100%;height:8px;appearance:none;background:linear-gradient(90deg,var(--teal) 0 50%,#dbe7e9 50%);border-radius:999px;outline:none}
input[type=range]::-webkit-slider-thumb{appearance:none;width:23px;height:23px;border-radius:50%;background:#fff;border:7px solid var(--teal);box-shadow:0 3px 10px rgba(23,62,77,.2);cursor:pointer}
input[type=range]::-moz-range-thumb{width:10px;height:10px;border-radius:50%;background:#fff;border:7px solid var(--teal);box-shadow:0 3px 10px rgba(23,62,77,.2);cursor:pointer}
.divider{height:1px;background:#dbe7e9;margin:23px 0 0}.b-control{margin-top:18px}
.drag-hint{margin:9px 0 18px;color:var(--teal-dark);font-size:13px;line-height:1.55}
.switch-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 0;border-top:1px solid #dbe7e9;cursor:pointer}
.switch-row>span:first-child{display:flex;flex-direction:column;gap:3px}.switch-row strong{font-size:14px}.switch-row small{color:var(--muted);font-size:12px;line-height:1.4}
.switch-control{position:relative;display:block;flex:0 0 auto;width:48px;height:28px}
.switch-control input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.switch-track{display:block;width:48px;height:28px;padding:3px;border-radius:999px;background:#c9d7da;transition:background .18s ease}
.switch-track span{display:block;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 2px 7px rgba(23,62,77,.22);transition:transform .18s ease}
.switch-control input:checked+.switch-track{background:var(--teal)}
.tangent-switch .switch-control input:checked+.switch-track{background:var(--orange)}
.switch-control input:checked+.switch-track span{transform:translateX(20px)}
.switch-control input:focus-visible+.switch-track{outline:3px solid rgba(233,138,32,.42);outline-offset:3px}
.force-control-group{padding:4px 12px 12px;border-radius:13px;background:#fff8ed;border:1px solid #efd3a8}.force-control{margin:4px 0 10px}.force-control strong{color:#a85c0d}.force-hint{margin:8px 0 0;color:#a56a2b;font-size:12px}.tangent-force-range::-webkit-slider-thumb{border-color:var(--orange)}.tangent-force-range::-moz-range-thumb{border-color:var(--orange)}
.button-row{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:14px}
.button-row.top-actions{margin:0 0 18px;padding-bottom:18px;border-bottom:1px solid #dbe7e9}
.primary-button,.secondary-button{border-radius:12px;min-height:44px;padding:10px 14px;font-weight:800;cursor:pointer}
.primary-button{grid-column:1/-1;border:0;background:var(--teal);color:#fff}.primary-button:hover{background:var(--teal-dark)}
.secondary-button{border:1px solid var(--line);background:#fff;color:var(--ink)}
button:disabled,input:disabled{opacity:.48;cursor:not-allowed}
button:focus-visible,input:focus-visible{outline:3px solid rgba(233,138,32,.42);outline-offset:3px}
.experiment-topline{display:flex;align-items:center;justify-content:space-between;margin-bottom:13px}
.status-badge{padding:8px 13px;border-radius:999px;font-size:14px;font-weight:850}.status-badge.uniform{background:var(--teal-soft);color:var(--teal-dark)}.status-badge.accelerated{background:var(--orange-soft);color:#a35b0d}
.canvas-wrap{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:17px;background:#f8fbfb;touch-action:none}
canvas{display:block;width:100%;height:auto;aspect-ratio:1200/720}
.canvas-tip{position:absolute;right:12px;bottom:10px;padding:6px 9px;border-radius:8px;background:rgba(255,255,255,.9);color:var(--muted);font-size:12px}
.live-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.live-metrics>div{padding:12px 14px;border-radius:14px;background:#f5f9f9;border:1px solid #dbe7e9}.live-metrics span{display:block;color:var(--muted);font-size:13px;margin-bottom:5px}.live-metrics strong{font-size:18px;font-variant-numeric:tabular-nums}
.live-metrics .measure-card{background:#f2f8fb;border-color:#bfd7df}.live-metrics .formula-card{background:#edf8f3;border-color:#b8dbc9}.live-metrics .formula-card strong{color:var(--green)}
.live-metrics.changing>div{background:#fff8ed;border-color:#efcf9e}.live-metrics.changing strong{color:#a85c0d}
.data-panel{margin-top:20px;padding:22px}.data-panel[hidden]{display:none}
.data-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:16px}.formula{padding:10px 15px;border-radius:12px;background:var(--teal-soft);color:var(--teal-dark);font-size:18px;font-weight:850}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px}
table{width:100%;border-collapse:collapse;min-width:680px}th,td{text-align:left;padding:13px 16px;border-bottom:1px solid #dbe7e9;font-size:14px}th{background:#eef5f6;color:#496772;font-weight:850}td:nth-child(2),td:nth-child(3){font-variant-numeric:tabular-nums;font-weight:750}.highlight-row{background:#f2f8fb}.verify-row{background:#edf8f3}tbody tr:last-child td{border-bottom:0}
.verification-result{margin-top:13px;padding:13px 15px;border-radius:12px;background:#edf8f3;color:var(--green);font-size:14px;font-weight:750}
.conclusion-strip{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px;padding:20px}
.conclusion-strip>div{display:flex;align-items:flex-start;gap:12px}.conclusion-mark{flex:0 0 auto;padding:6px 9px;border-radius:8px;background:var(--teal-soft);color:var(--teal-dark);font-size:13px;font-weight:900}.conclusion-mark.orange{background:var(--orange-soft);color:#a65b0b}.conclusion-strip p{margin:1px 0 0;color:var(--muted);font-size:15px;line-height:1.7}
@media(max-width:920px){.page-header{align-items:flex-start;flex-direction:column}.header-actions{align-items:flex-start}.model-tags{justify-content:flex-start}.workspace{grid-template-columns:1fr}.control-panel{position:static}.button-row{grid-template-columns:2fr 1fr 1fr}.primary-button{grid-column:auto}}
@media(max-width:640px){.page-shell{width:calc(100% - 18px);padding-top:20px}.control-panel,.experiment-panel,.data-panel{padding:15px;border-radius:17px}.page-header p{font-size:15px}.live-metrics{grid-template-columns:1fr}.data-heading,.experiment-topline{align-items:flex-start;flex-direction:column}.formula{font-size:15px}.conclusion-strip{grid-template-columns:1fr;padding:16px}.button-row{grid-template-columns:1fr 1fr}.primary-button{grid-column:1/-1}}
@media(prefers-reduced-motion:reduce){.switch-track,.switch-track span{transition:none}}