:root {
  --navy:#0d1b2e; --ink:#152842; --muted:#60728a; --line:#d9e2eb; --canvas:#eef3f7; --panel:#fff;
  --blue:#0072b2; --orange:#e69f00; --purple:#cc79a7; --green:#009e73; --red:#d55e00;
  --shadow:0 10px 26px rgba(24,49,79,.07);
}
*{box-sizing:border-box} html{font-size:16px} body{margin:0;background:var(--canvas);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif} button,input{font:inherit} button{cursor:pointer}
.topbar{height:66px;padding:0 clamp(16px,2.2vw,34px);display:flex;align-items:center;justify-content:space-between;background:var(--navy);color:white}.brand{display:flex;align-items:center;gap:13px}.brand h1{margin:0;font-size:1.2rem;letter-spacing:-.02em}.brand p{margin:2px 0 0;color:#a8b9ce;font-size:.82rem}.brand-dots{width:38px;height:38px;padding:8px;display:grid;grid-template-columns:1fr 1fr;gap:4px;border:1px solid #344861;border-radius:10px}.brand-dots i{border-radius:50%}.brand-dots i:nth-child(1){background:var(--blue)}.brand-dots i:nth-child(2){background:var(--orange)}.brand-dots i:nth-child(3){background:var(--purple)}.brand-dots i:nth-child(4){background:var(--green)}
.synthetic-note{font-size:.82rem;color:#d4deeb;border:1px solid #344861;padding:7px 11px;border-radius:999px}.synthetic-note i{display:inline-block;width:7px;height:7px;background:#f0e442;border-radius:50%;margin-right:7px}
main{max-width:1760px;margin:auto;padding:14px clamp(12px,1.8vw,28px) 28px}.control-strip{display:grid;grid-template-columns:minmax(500px,1.2fr) minmax(310px,.8fr) 190px;gap:18px;align-items:center;background:white;border:1px solid var(--line);border-radius:13px;padding:12px 14px;box-shadow:var(--shadow)}
.method-switch{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:#eaf0f5;padding:4px;border-radius:9px}.method-button{min-height:44px;border:0;border-radius:7px;background:transparent;color:#52677f;display:flex;align-items:center;justify-content:center;gap:9px;font-size:.88rem}.method-button span{width:22px;height:22px;display:grid;place-items:center;border:1px solid #aebdcb;border-radius:50%;font-size:.7rem;font-weight:800}.method-button.active{background:white;color:var(--blue);box-shadow:0 2px 8px rgba(20,45,73,.12)}.method-button.active span{background:var(--blue);border-color:var(--blue);color:white}
.sample-control label{display:flex;justify-content:space-between;align-items:center;font-size:.86rem;font-weight:750}.sample-control output{background:var(--navy);color:white;padding:4px 10px;border-radius:6px;font-weight:800}.sample-control>div{display:grid;grid-template-columns:28px 1fr 34px;gap:8px;align-items:center;color:#74859b;font-size:.75rem;margin-top:6px}.sample-control input{width:100%;accent-color:var(--blue)}
.primary-button,.secondary-button{border:0;border-radius:8px;font-weight:800}.primary-button{height:46px;color:white;background:var(--blue)}.primary-button:hover{background:#005f94}.primary-button span{font-size:1.1rem;margin-right:5px}.secondary-button{padding:11px 16px;background:var(--navy);color:white}.secondary-button:disabled{opacity:.6;cursor:wait}
.flow-label{height:49px;display:grid;grid-template-columns:1fr 48px 1fr;align-items:center;text-align:center}.flow-label>div{display:flex;align-items:baseline;justify-content:center;gap:9px}.flow-label span,.eyebrow{font-size:.7rem;letter-spacing:.12em;color:var(--blue);font-weight:850}.flow-label b{font-size:.82rem}.flow-label strong{color:#8a9aab;font-size:1.35rem}
.workspace{display:grid;grid-template-columns:minmax(290px,1fr) minmax(290px,1fr) minmax(400px,1.15fr);gap:12px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:13px;box-shadow:var(--shadow)}.workspace>.panel{min-height:448px;padding:16px}.panel-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.panel-head h2,.repeat-section h2,.reflection h2{margin:3px 0 0;font-size:1.05rem;letter-spacing:-.01em}.count-chip{padding:5px 8px;border-radius:6px;background:#eff3f7;color:#596d84;font-size:.73rem;font-weight:800}.count-chip.accent{background:#e7f4fb;color:#00699f}
.structure-stage{margin-top:13px;height:188px;padding:55px 16px 18px;border:1px solid #e1e8ef;border-radius:9px;background:linear-gradient(180deg,#fafcfe,#f3f7fa);display:flex;flex-direction:column;justify-content:center}.sample-structure{background:linear-gradient(180deg,#f8fbfd,#eef4f8)}.stacked-structure{display:flex;width:100%;height:68px;overflow:hidden;border-radius:8px;background:#e2e9f0;box-shadow:inset 0 0 0 1px rgba(13,27,46,.08)}.bar-segment{height:100%;display:flex;align-items:center;justify-content:center;border-right:2px solid rgba(255,255,255,.8);color:white;font-size:.8rem;font-weight:850;text-shadow:0 1px 2px rgba(0,0,0,.32);transition:width .28s ease;overflow:hidden;white-space:nowrap}.bar-segment:last-child{border-right:0}.bar-scale{display:flex;justify-content:space-between;margin-top:8px;color:#7b8ca0;font-size:.66rem}.channel-legend{display:grid;grid-template-columns:1fr 1fr;gap:8px 14px;margin-top:13px}.legend-item{display:grid;grid-template-columns:12px 1fr auto;gap:7px;align-items:center;font-size:.78rem}.legend-item i{width:10px;height:10px;border-radius:3px}.legend-item b{font-size:.78rem}.legend-item span:last-child{color:var(--muted);font-variant-numeric:tabular-nums}
.method-explanation{margin:12px 0 0;padding:10px 11px;border-left:3px solid var(--blue);background:#eef7fc;color:#40566e;font-size:.79rem;line-height:1.45}.panel-head.compact{margin-bottom:9px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:.78rem}th{padding:9px 6px;color:#6a7b91;text-align:right;border-bottom:1px solid var(--line);font-size:.7rem}th:first-child,td:first-child{text-align:left}td{padding:10px 6px;text-align:right;border-bottom:1px solid #edf1f5;font-variant-numeric:tabular-nums}td:first-child{font-weight:750}td i{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:7px}.warning-box{display:none;margin-top:10px;padding:9px 10px;border:1px solid #edc97f;border-radius:8px;background:#fff8e8;color:#6b4b0b;font-size:.76rem;line-height:1.4}.warning-box.show{display:block}.warning-box.danger{background:#fff2ed;border-color:#efb29b;color:#7c3116}
.churn-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-top:12px}.churn-summary div{padding:10px;border:1px solid var(--line);border-radius:8px;background:#f8fafc}.churn-summary span,.churn-summary small{display:block;color:var(--muted);font-size:.67rem}.churn-summary strong{display:block;font-size:1.13rem;margin:4px 0}.churn-summary small{font-size:.62rem}
.exercise-callout{display:grid;grid-template-columns:42px 1fr 130px;gap:13px;align-items:center;margin:12px 0;background:#102a45;color:white;border-radius:11px;padding:11px 14px}.exercise-number{width:34px;height:34px;display:grid;place-items:center;border-radius:8px;background:var(--blue);font-size:.72rem;font-weight:850}.exercise-callout p{margin:0;color:#d9e5f2;font-size:.84rem;line-height:1.4}.exercise-callout p b{color:white;margin-right:7px}.draw-counter{text-align:right}.draw-counter span{display:block;color:#9fb2c8;font-size:.64rem}.draw-counter strong{font-size:1.25rem}
.repeat-section{display:grid;grid-template-columns:300px 1fr;gap:22px;padding:18px;margin-top:12px}.repeat-intro p{font-size:.8rem;line-height:1.5;color:var(--muted);margin:9px 0 14px}.repeat-results{display:grid;grid-template-columns:minmax(360px,.95fr) minmax(420px,1.25fr);gap:15px}.comparison-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.comparison-cards article{border:1px solid var(--line);border-radius:9px;padding:10px;background:#fafcfe}.comparison-cards article>span{display:block;min-height:32px;color:var(--muted);font-size:.67rem;line-height:1.25}.comparison-cards article>div{display:grid;grid-template-columns:1fr auto;align-items:baseline;margin-top:7px}.comparison-cards b{font-size:1.05rem}.comparison-cards small{font-size:.61rem;font-weight:800;color:#60748d}.comparison-cards small:nth-of-type(1){color:var(--orange)}.comparison-cards small:nth-of-type(2){color:var(--blue)}
.distribution-chart{border:1px solid var(--line);border-radius:9px;padding:7px;background:#fafcfe}.distribution-chart svg{width:100%;height:170px;display:block}.chart-legend{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;color:#62748a;font-size:.66rem}.chart-legend i{display:inline-block;width:14px;height:7px;border-radius:2px;margin-right:5px}.srs-key{background:var(--orange)}.strat-key{background:var(--blue)}.chart-legend .true-key{height:0;border-top:2px dashed var(--green);border-radius:0}
.reflection{margin-top:12px;padding:16px;display:grid;grid-template-columns:240px 1fr 1fr;gap:16px;align-items:center}.question{border-left:1px solid var(--line);padding-left:16px}.question p{font-size:.78rem;font-weight:750;margin:0 0 8px}.question>div{display:flex;gap:5px;flex-wrap:wrap}.question button{border:1px solid #c8d3df;border-radius:6px;background:white;color:#4c6077;padding:6px 8px;font-size:.69rem;font-weight:750}.question button.selected{border-color:var(--blue);background:#eaf6fc;color:#005f92}.question small{display:block;min-height:17px;margin-top:6px;color:var(--green);font-size:.67rem}
.takeaway{display:grid;grid-template-columns:90px 1fr;gap:12px;align-items:center;margin-top:12px;padding:14px 16px;border-radius:11px;background:#e9f5f1;border:1px solid #b9ddd1;color:#214c40}.takeaway span{font-size:.72rem;letter-spacing:.12em;font-weight:900;text-transform:uppercase}.takeaway p{margin:0;font-size:.8rem;line-height:1.5;font-weight:650}
button:focus-visible,input:focus-visible{outline:3px solid rgba(0,114,178,.34);outline-offset:2px}
@media(max-width:1250px){.control-strip{grid-template-columns:1.2fr .8fr 170px}.workspace{grid-template-columns:1fr 1fr}.results-panel{grid-column:1/-1;min-height:0!important}.results-panel{display:grid;grid-template-columns:1.4fr .8fr;gap:0 16px}.results-panel .panel-head{grid-column:1/-1}.churn-summary{grid-column:2;grid-row:2}.warning-box{grid-column:1/-1}.repeat-section{grid-template-columns:250px 1fr}.repeat-results{grid-template-columns:1fr}.distribution-chart svg{height:150px}}
@media(max-width:900px){.control-strip{grid-template-columns:1fr 1fr}.method-switch{grid-column:1/-1}.primary-button{align-self:end}.repeat-section{grid-template-columns:1fr}.reflection{grid-template-columns:1fr}.question{border-left:0;border-top:1px solid var(--line);padding:12px 0 0}.repeat-results{grid-template-columns:1fr 1.1fr}}
@media(max-width:680px){.topbar{height:58px}.brand h1{font-size:1rem}.brand p,.synthetic-note{display:none}main{padding-inline:9px}.control-strip{grid-template-columns:1fr;gap:11px}.method-switch{grid-column:auto}.method-button{font-size:.73rem}.flow-label{grid-template-columns:1fr 28px 1fr}.flow-label>div{display:block}.workspace{grid-template-columns:1fr}.workspace>.panel{min-height:0}.structure-stage{height:150px;padding:38px 10px 14px}.stacked-structure{height:56px}.results-panel{grid-column:auto;display:block}.churn-summary{grid-column:auto}.exercise-callout{grid-template-columns:36px 1fr}.draw-counter{grid-column:2;text-align:left;display:flex;gap:8px;align-items:center}.repeat-results{grid-template-columns:1fr}.comparison-cards{grid-template-columns:1fr 1fr 1fr}.comparison-cards article>span{min-height:46px}.takeaway{grid-template-columns:1fr}.channel-legend{font-size:.7rem}}
@media(max-width:430px){.method-switch{grid-template-columns:1fr}.churn-summary{grid-template-columns:1fr 1fr}.churn-summary div:first-child{grid-column:1/-1}.comparison-cards{grid-template-columns:1fr}.comparison-cards article{display:grid;grid-template-columns:1fr 1.2fr}.comparison-cards article>span{min-height:0}.reflection{padding:14px}.chart-legend{justify-content:flex-start}}