:root{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;color:#243c36;background:#f8f7f2;line-height:1.65}*{box-sizing:border-box}body{margin:0}main{max-width:1040px;margin:0 auto;padding:48px 24px 100px}header{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid #d8dfd8;padding-bottom:20px;margin-bottom:38px}.brand{font-weight:800;letter-spacing:.06em}a{color:inherit}h1{font-family:Georgia,"Songti SC",serif;font-size:clamp(30px,5vw,52px);line-height:1.2;font-weight:500;margin:12px 0 20px}h2{font-size:22px;margin:0 0 12px}p{margin:8px 0 18px}.muted{color:#69776e;font-size:14px}.eyebrow{font-size:12px;letter-spacing:.2em;color:#728375}.pill{display:inline-block;background:#e4ece4;border:1px solid #cedacb;padding:4px 12px;border-radius:30px;font-size:13px}.hero{max-width:740px;margin-bottom:34px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{border:1px solid #d7ddd3;border-radius:20px;background:#fff;padding:24px;margin-bottom:18px;box-shadow:0 5px 20px #233d3504}.number{font:italic 32px Georgia;color:#849b7d;margin-bottom:18px}.card .desc{color:#6c796f;min-height:52px}button,.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 20px;border-radius:10px;border:1px solid #284d3c;background:#284d3c;color:#fff;font:inherit;font-size:15px;cursor:pointer;text-decoration:none;gap:8px}button.secondary,.button.secondary{background:transparent;color:#284d3c}button:disabled{background:#e9ece7;color:#899088;border-color:#dde2d8;cursor:not-allowed}input,select,textarea{font:inherit;padding:11px 12px;border:1px solid #c6d0c5;border-radius:9px;width:100%;background:#fff;color:#243c36}label{display:block;font-size:14px;margin:12px 0 7px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.row>*{flex:1}small{font-size:12px}.notice{border-left:3px solid #b69b60;padding:10px 16px;background:#f4efdf;margin:18px 0;font-size:14px}.error{color:#9d382f}.success{color:#2b6542}.wide{grid-column:1/-1}table{width:100%;border-collapse:collapse;font-size:14px}td,th{text-align:left;padding:10px;border-bottom:1px solid #e0e5de;vertical-align:top}.scroll{overflow:auto}.steps{font-size:14px;display:flex;gap:14px;color:#73816e}.source{font-size:13px;padding:12px;background:#f3f5ef;border-radius:8px;white-space:pre-wrap}.answer{white-space:pre-wrap}.hidden{display:none!important}footer{font-size:12px;color:#8b938a;margin-top:48px}@media(max-width:700px){main{padding:24px 18px 70px}.grid{grid-template-columns:1fr}header{margin-bottom:26px}.card .desc{min-height:0}.row>*{min-width:150px}.steps{display:none}h1{font-size:34px}}

/* Student library: editorial typography, open rows and quiet navigation. */
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.chat-turn{padding:22px 0;border-top:1px solid #ddd6cd}.chat-question{font-weight:600;color:#252c29}.chat-response{white-space:pre-wrap;line-height:1.9}.chat-turn .source{white-space:pre-wrap}.chat-turn small{display:block;margin-top:12px}

.learn-unit-switch{display:flex;align-items:center;gap:16px;margin-top:25px}.learn-unit-switch label{font-size:12px;color:#73776f;white-space:nowrap;margin:0}.learn-unit-switch select{width:auto;max-width:65%;border-radius:3px;background:transparent;font-size:13px}.learn-page #unit-title{max-width:950px} @media(max-width:600px){.learn-unit-switch{display:block}.learn-unit-switch select{margin-top:10px;width:100%;max-width:100%}}

[hidden]{display:none!important}
.learn-page header{margin-bottom:30px}.learn-page .hero{margin-bottom:32px}.learn-page h1{font-size:46px;line-height:1.2;letter-spacing:-1px;margin:14px 0}.learn-page #profile{margin-top:14px}
.learn-unit-switch{margin:0 0 24px}.learn-page #stages .card{padding:22px 0}.chat-sources{font-size:12px;color:#697169}.chat-sources summary{cursor:pointer;padding:4px 0}
@media(max-width:700px){.learn-page h1{font-size:34px}.learn-page header{margin-bottom:30px}.learn-page .hero{margin-bottom:26px}}