.student-hub{width:100%;min-width:0;display:grid;grid-template-columns:220px minmax(0,1fr);max-width:1660px;margin:auto;min-height:85vh;color:#173f35;background:#f4f6f1}.hub-rail{padding:32px 16px;background:#e9eee4;display:flex;flex-direction:column;border-right:1px solid #d6ded0;position:-webkit-sticky;position:sticky;top:76px;align-self:start;height:calc(100dvh - 76px)}.hub-wordmark{font-weight:700;padding:12px;font-size:15px;margin-bottom:26px}.hub-rail nav{display:grid;grid-gap:5px;gap:5px}.hub-rail nav a,.hub-rail nav button{display:flex;text-align:left;align-items:center;gap:12px;min-height:46px;padding:10px 14px;border:0;border-radius:12px;background:transparent;color:inherit;font:inherit;font-size:14px;text-decoration:none;cursor:pointer}.hub-rail nav [aria-current=page]{background:#173f35;color:white;box-shadow:0 6px 18px #173f351f}.hub-rail nav small{margin-left:auto}.hub-rail-bottom{margin-top:auto;padding:14px;font-size:13px}.hub-body{padding:40px clamp(16px,4vw,64px);min-width:0;animation:hub-appear .35s ease-out}.hub-top{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-bottom:24px}.hub-top h1{font-size:clamp(25px,3vw,42px);line-height:1.18;font-weight:550;letter-spacing:-1px;margin:8px 0}.hub-balance{background:white;padding:14px 22px;border:1px solid #d6ded0;border-radius:18px;font-size:27px;text-decoration:none;font-weight:700;white-space:nowrap}.hub-balance span{display:block;font-size:11px;font-weight:500}.hub-tools{display:flex;gap:12px;margin-bottom:28px}.hub-tools input{flex:1 1;min-width:0;border-radius:14px;border:1px solid #d3ddcd;background:#fff;padding:14px 18px;min-height:48px}.hub-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:16px;gap:16px;margin-bottom:24px}.hub-summary article{border:1px solid #d9e1d3;border-radius:18px;background:#fff;padding:24px}.hub-summary strong{font-size:36px;letter-spacing:-1px;font-weight:550}.hub-summary p{margin:2px 0 14px}.hub-summary button{border:0;background:none;padding:0;color:#176247;cursor:pointer;font:inherit}.hub-summary small{color:#5a6b64}.hub-continue{padding:32px;border-radius:24px;display:flex;align-items:center;justify-content:space-between;gap:20px;background:#dce9d0;border:1px solid #cedfc1;margin-bottom:24px}.hub-continue h2{font-size:clamp(23px,2.5vw,34px);margin:8px 0}.hub-split{display:grid;grid-template-columns:1fr 1fr;grid-gap:20px;gap:20px}.hub-panel{background:white;border:1px solid #dbe2d5;border-radius:20px;padding:28px;min-width:0}.hub-panel h2{font-size:25px;margin:8px 0 18px}.hub-panel p{color:#5a6b64;line-height:1.65}.hub-result{display:block;width:100%;text-align:left;border:0;border-top:1px solid #e3e8de;background:none;padding:18px 0;color:inherit;text-decoration:none;font:inherit;cursor:pointer;overflow-wrap:anywhere}.hub-result h3{font-size:16px;margin:0 0 6px}.hub-result p{font-size:13px;margin:0}.hub-result small{text-transform:uppercase;font-size:11px}.hub-lessons{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));grid-gap:18px;gap:18px;margin-top:24px}.hub-lessons a{padding:22px;border-radius:16px;border:1px solid #dce5d4;background:#f7f9f4;text-decoration:none;transition:transform .2s,box-shadow .2s}.hub-lessons a:hover{transform:translateY(-3px);box-shadow:0 12px 25px #163c3512}.hub-lessons h2{font-size:20px}.hub-lessons p{font-size:13px}.hub-lessons small{font-size:10px;letter-spacing:1px}.hub-error{padding:16px;border-radius:12px;background:#fff0e9;border:1px solid #ecc4b8;margin-bottom:20px;overflow-wrap:anywhere}.hub-error button{margin-left:12px}.hub-form{max-width:660px;display:grid;grid-gap:16px;gap:16px}.hub-form label{display:grid;grid-gap:7px;gap:7px}.hub-form input,.hub-form textarea{padding:12px;border:1px solid #cbd8c5;border-radius:10px;max-width:100%}.hub-exam{border-top:1px solid #dee5d7;margin-top:28px;padding-top:24px}.hub-exam ul,.hub-ledger{list-style:none;padding:0}.hub-exam li label{display:flex;gap:12px;padding:12px 0}.hub-exam small,.hub-ledger small{display:block;font-size:12px;color:#68786c;overflow-wrap:anywhere}.hub-exam input{width:22px;height:22px}.hub-answer{padding:32px;background:#f2f7ea;border-radius:16px;margin:24px 0;font-size:22px}.hub-ratings{display:flex;flex-wrap:wrap;gap:12px}.hub-review{min-height:400px}.hub-review h2{font-size:clamp(24px,3vw,38px)}.hub-ledger li{display:flex;gap:18px;padding:14px 0;border-bottom:1px solid #e5ebe0}.hub-ledger strong{min-width:50px}.hub-source{padding:20px 0;border-top:1px solid #dce5d6}.hub-source button{margin-left:18px}.student-hub :is(button,a,input,textarea):focus-visible{outline:3px solid #357a59;outline-offset:3px}.hub-composer .composer-area{max-width:100%}.hub-composer .study-composer{background:#f7faf2}.hub-panel .btn{min-height:44px}@keyframes hub-appear{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}@media (max-width:1050px){.student-hub{grid-template-columns:185px minmax(0,1fr)}.hub-body{padding:28px 20px}.hub-summary article{padding:18px}.hub-split{grid-template-columns:1fr}.hub-continue{flex-direction:column;align-items:start}}@media (max-width:720px){.student-hub{display:block}.hub-rail{position:static;width:100%;height:auto;padding:10px 12px;border:0;border-bottom:1px solid #d6ded0}.hub-rail-bottom,.hub-wordmark{display:none}.hub-rail nav{max-width:100%;min-width:0;display:flex;overflow:auto;gap:6px;scrollbar-width:thin}.hub-rail nav a,.hub-rail nav button{flex:none;min-height:44px;padding:10px;font-size:12px;white-space:nowrap}.hub-body{padding:24px 14px}.hub-top{gap:12px}.hub-top h1{letter-spacing:-.5px}.hub-balance{padding:10px 12px;font-size:22px}.hub-balance span{font-size:9px}.hub-tools{flex-wrap:wrap}.hub-tools input{flex-basis:100%}.hub-tools button{width:100%}.hub-summary{gap:8px;margin-bottom:18px}.hub-summary article{padding:14px 10px}.hub-summary strong{font-size:27px}.hub-summary p{font-size:12px}.hub-summary small{font-size:10px}.hub-summary button{font-size:11px;min-height:44px}.hub-panel{padding:20px 16px}.hub-continue{padding:24px}.hub-source button{margin:12px 0;display:block}.hub-form input,.hub-form textarea{width:100%;min-width:0}}@media (prefers-reduced-motion:reduce){.hub-body{animation:none}.hub-lessons a{transition:none}.hub-lessons a:hover{transform:none}}