.app-shell{max-width:1180px;margin:auto;padding:18px 28px 46px}
.intro{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:24px;align-items:end;margin:14px 0 12px}
.eyebrow,.overline{margin:0 0 6px;color:var(--teal);font-size:.72rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase}
.intro h1{max-width:790px;margin:0;font-size:clamp(1.5rem,3vw,2.5rem);line-height:1.08;letter-spacing:-.03em}
.lede{max-width:740px;margin:8px 0 0;color:var(--muted);font-size:.9rem}
.formula{padding:12px 15px;border:1px solid #c8d9f1;border-radius:14px;background:#edf4ff;box-shadow:var(--shadow)}
.formula span,.formula small{display:block;color:var(--muted);font-size:.72rem;font-weight:750}
.formula strong{display:block;margin:4px 0 1px;font-size:.92rem;color:var(--blue)}

.card{padding:23px;border:1px solid var(--line);border-radius:20px;background:var(--card);box-shadow:var(--shadow)}
.toolbar{position:sticky;top:10px;z-index:30;display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:16px;padding:12px 20px}
.toolbar label{color:var(--muted);font-size:.78rem;font-weight:800}
.toolbar select{margin-left:6px;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font:inherit}
.control-step{color:var(--blue);font-size:.78rem;font-weight:900}
.tag{display:inline-flex;white-space:nowrap;border-radius:999px;padding:4px 9px;font-size:.69rem;font-weight:800;letter-spacing:.03em}
.tag-teal{background:#e3f5f3;color:#137674}
.tag-amber{background:#fff2da;color:#96600d}
.mode-picker{display:flex;align-items:center;gap:5px;flex-wrap:wrap}
.mode-button{border:1px solid var(--line);border-radius:8px;padding:7px 11px;background:#fff;color:var(--ink);font:800 .76rem inherit;cursor:pointer}
.mode-button.active{border-color:var(--blue);background:#eaf3ff;color:var(--blue)}
.param-row{display:flex;align-items:center;gap:9px}
.param-row[hidden]{display:none}
.param-row label{color:var(--muted);font-size:.78rem;font-weight:800}
.param-row input[type=range]{width:150px}
.param-value{min-width:34px;color:var(--ink);font-size:.8rem;font-weight:850;font-family:ui-monospace,SFMono-Regular,monospace}
.button-secondary{margin-left:auto;border:0;border-radius:9px;padding:9px 13px;background:var(--teal);color:#fff;cursor:pointer;font-size:.8rem;font-weight:850}

.main-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(330px,.82fr);gap:20px}
.main-grid .tree-section{grid-column:1/-1;margin-top:0}
.card-heading,.section-heading{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.card h2,.section-heading h2{margin:0;font-size:1.22rem}
.card-heading p,.section-heading>p{margin:6px 0 0;color:var(--muted);font-size:.88rem}
.chart-card svg.chart{display:block;width:100%;height:auto;max-height:406px;margin-top:10px;cursor:crosshair}
.hist-bg{fill:#fbfcfc;stroke:#dfe6ea}
.hist-active{fill:none;stroke:#2b67c5;stroke-width:1.6;stroke-dasharray:3 2}
.hist-caption{fill:#8a97a1;font-size:9px;font-weight:750}
.chart-card .point{cursor:pointer;transition:r .15s}
.chart-card .point:hover{stroke:#17212b;stroke-width:4}
.plot-axis{stroke:#8b9aa3;stroke-width:1.2}
.plot-grid{stroke:#e2e8ea;stroke-width:1}
.axis-label{fill:#64747e;font-size:12px;font-weight:800}
.decision-region{opacity:.19}
.window-ellipse{fill:rgba(20,138,136,.08);stroke:var(--teal);stroke-width:1.6;stroke-dasharray:5 3}
.test-hint{margin:12px 0 0;color:var(--blue);font-size:.78rem;font-weight:700}
.test-point{stroke-width:3}
.test-point-label{font-size:11px;font-weight:900}
.legend{display:flex;justify-content:center;gap:17px;margin-top:10px;color:var(--muted);font-size:.78rem}
.legend span{display:flex;align-items:center;gap:6px}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block}

.story-card{display:flex;flex-direction:column}
.story-card h2{font-size:1.4rem;line-height:1.1;margin:4px 0 10px}
.story-card>p:not(.overline){margin:0 0 10px;color:var(--muted);font-size:.82rem}
.window-summary{margin:12px 0 4px;padding:9px 11px;border-radius:9px;background:#f3f6f7;color:#3c4d55;font-size:.76rem;font-weight:700}
.score-list{display:grid;gap:8px;margin-top:10px}
.score-row{display:grid;grid-template-columns:12px 90px 1fr 42px 40px;align-items:center;gap:8px;font-size:.74rem;font-weight:750}
.score-row small{color:var(--muted);font-size:.68rem;font-weight:700;text-align:right}
.prob-dot{width:10px;height:10px;border-radius:50%}
.prob-track{height:11px;overflow:hidden;border-radius:99px;background:#eef1f2}
.prob-track i{display:block;height:100%;transition:width .25s}
.round-empty{padding:10px 2px;color:var(--muted);font-size:.8rem}
.confidence-note{margin:8px 0 0;color:var(--muted);font-size:.72rem;font-weight:650;line-height:1.4}
.loo-inline{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:14px;border-top:1px solid var(--line);color:var(--muted);font-size:.78rem;font-weight:750}
.loo-inline strong{color:var(--teal);font-size:1.05rem}

.tree-section{margin-top:28px;padding:25px;border:1px solid var(--line);border-radius:20px;background:#fff}
.section-heading{margin-bottom:12px}
.loo-chart{display:block;width:100%;height:auto;margin-top:6px}
.loo-area{fill:rgba(20,138,136,.12);stroke:none}
.loo-line{fill:none;stroke:var(--teal);stroke-width:2.4;stroke-linejoin:round}
.loo-current-line{stroke:#2b67c5;stroke-width:1.4;stroke-dasharray:4 3}
.loo-current-dot{fill:#2b67c5;stroke:#fff;stroke-width:2}
.loo-best-dot{fill:none;stroke:var(--amber);stroke-width:2.4}
.loo-rule-marker{fill:#8a5cc7;stroke:#fff;stroke-width:1.4}
.axis-label.loo-y{font-size:10px}
.axis-label.loo-y-title{font-size:9px}
.hist-likelihood{fill:none;stroke-width:1.8;opacity:.95}
.loo-legend{display:flex;flex-wrap:wrap;gap:14px 20px;margin-top:10px;color:var(--ink);font-size:.76rem;font-weight:700}
.loo-legend b{font-weight:900}
.legend-swatch{display:inline-block;width:10px;height:10px;margin-right:6px;vertical-align:middle}
.swatch-current{border-radius:50%;background:#2b67c5}
.swatch-best{border-radius:50%;background:#fff;border:2px solid var(--amber);box-sizing:border-box}
.swatch-rule{background:#8a5cc7;transform:rotate(45deg)}

.note{margin-top:18px;padding:15px 18px;border-left:4px solid var(--amber);border-radius:8px;background:#fff7e8;color:#66532d;font-size:.84rem}

@media(max-width:820px){
  .intro,.main-grid{grid-template-columns:1fr}
  .formula{max-width:400px}
}
@media(min-width:1700px){
  /* Ultrawide: don't just stretch the two cards wider — use the extra
     columns to bring the leave-one-out curve up beside them instead of
     making the visitor scroll for it. */
  .main-grid{grid-template-columns:minmax(0,1.15fr) minmax(300px,.72fr) minmax(380px,.95fr)}
  .main-grid .tree-section{grid-column:auto;margin-top:0}
  .loo-chart{height:100%}
}
@media(max-width:560px){
  .app-shell{padding:25px 16px 35px}
  .card,.tree-section{padding:16px}
  .card-heading,.section-heading{display:block}
  .tag{display:inline-block;margin-top:10px}
  .section-heading>p{margin-top:9px}
  .toolbar{gap:12px}
  .button-secondary{margin-left:0;width:100%}
  .param-row input[type=range]{flex:1}
}