body{background:radial-gradient(circle at 8% 18%,rgba(207,238,228,.72),transparent 28rem),radial-gradient(circle at 92% 32%,rgba(255,224,188,.58),transparent 27rem),var(--paper)}
.hero h1 em{color:#3b9777}.back-link{background:#e8f7f1;border-color:#bfe5d7}.tools button:hover{background:#e8f7f1}.progress i{background:linear-gradient(90deg,#43a783,#edb85e)}.mission-card{background:linear-gradient(135deg,#dff5ed,#fff4dd);border-color:#bfe5d7}.mission-card small,.route{color:#3c755f}.phase-track .active b{background:#8bd1b7}.series-track .active{background:#e2f5ee;border-color:#9bd3bf}
.passage-workbench{grid-template-columns:minmax(0,1.12fr) minmax(300px,.88fr)}.discovery-card{background:linear-gradient(145deg,#fbfffd,#fffaf1);border:1px solid var(--line);border-radius:18px;overflow:hidden}.discovery-head{align-items:center;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;padding:12px 14px}.discovery-head span{font:900 13px Nunito,sans-serif}.discovery-head small{color:var(--muted);font-size:10px}.visual-stage{align-items:center;display:flex;justify-content:center;min-height:310px;padding:24px}.visual-card{width:100%}.visual-kicker{color:#397d64;display:block;font:900 10px Nunito,sans-serif;letter-spacing:.12em;margin-bottom:10px;text-align:center;text-transform:uppercase}.equation{font:900 clamp(30px,5vw,54px)/1.15 Nunito,sans-serif;text-align:center}.equation .blank{border-bottom:4px solid #43a783;color:#3b9777;display:inline-block;min-width:54px}.visual-note{color:var(--muted);font-size:14px;font-weight:700;line-height:1.5;margin:14px auto 0;max-width:470px;text-align:center}.mini-line{margin:28px auto 12px;max-width:520px;padding:28px 0 24px;position:relative}.mini-line::before{background:#5d625f;content:"";height:3px;left:3%;position:absolute;right:3%;top:38px}.mini-points{display:flex;justify-content:space-between;position:relative}.mini-points span{font:900 13px Nunito,sans-serif;min-width:52px;padding-top:30px;position:relative;text-align:center}.mini-points span::before{background:#fff;border:3px solid #6fb99f;border-radius:50%;content:"";height:13px;left:50%;position:absolute;top:2px;transform:translateX(-50%);width:13px}.mini-points span.focus::before{background:#f6c96d;border-color:#aa7d23;box-shadow:0 0 0 7px rgba(246,201,109,.24)}.fraction-row,.set-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.fraction-tile,.set-tile{align-items:center;background:#fff;border:2px solid #bfe5d7;border-radius:15px;box-shadow:0 7px 18px rgba(48,50,58,.06);display:flex;font:900 clamp(22px,4vw,35px) Nunito,sans-serif;justify-content:center;min-height:88px;min-width:105px;padding:14px}.fraction-tile small{color:var(--muted);font-size:13px;margin-left:7px}.set-row{align-items:center}.set-tile{border-radius:50%;height:108px;min-width:108px}.set-arrow{color:#3b9777;font:900 25px Nunito,sans-serif}.definition-card{background:#fff;border:2px dashed #9bd3bf;border-radius:18px;font:900 clamp(20px,3.5vw,32px)/1.45 Nunito,sans-serif;margin:auto;max-width:520px;padding:25px;text-align:center}.definition-card b{color:#3b9777}.choice.math-choice{font:900 17px Nunito,sans-serif;text-align:center}.passage-shell:fullscreen .passage-workbench,.passage-shell:-webkit-full-screen .passage-workbench{align-items:stretch}.passage-shell:fullscreen .discovery-card,.passage-shell:-webkit-full-screen .discovery-card{display:flex;flex-direction:column;justify-content:center}
@media(max-width:850px){.passage-workbench{grid-template-columns:1fr}.visual-stage{min-height:270px}}@media(max-width:600px){.visual-stage{min-height:240px;padding:18px 12px}.fraction-tile{min-height:70px;min-width:82px}.set-tile{height:80px;min-width:80px}}