.student-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:12px}.student-heading .page-heading{margin:0}.student-heading>.text-link{margin-right:12px}.student-support{color:var(--muted);margin:0 0 24px;line-height:1.7}.student-home .student-support{color:var(--ink);margin-bottom:20px}.student-subjects{display:flex;align-items:center;gap:36px;margin:0 0 42px;overflow-x:auto;padding-bottom:3px;scrollbar-width:thin}.student-subjects>span{font-weight:600;white-space:nowrap}.student-subject{font:inherit;color:var(--ink);padding:8px 0 11px;border:0;background:none;position:relative;white-space:nowrap;cursor:pointer}.student-subject.is-active{color:var(--accent);font-weight:600}.student-subject.is-active:after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--accent)}.student-section{margin-top:39px}.student-section .section-title{margin:0 0 8px}.student-open-row{display:grid;grid-template-columns:minmax(0,1fr) 120px 110px;align-items:center;gap:24px;min-height:47px;line-height:1.6}.student-open-row>.text-link{justify-self:end;margin-right:12px}.student-subject-meta{color:var(--muted)}.student-ruled{border-top:1px solid var(--line);padding-top:28px;margin-top:24px}.student-week{display:grid;grid-template-columns:160px 1fr auto;gap:24px;align-items:center}.student-week .section-title{margin:0}.student-week>.text-link{margin-right:12px}.student-topic-picker{border-block:1px solid var(--line);margin-top:26px;padding:24px 0 16px}.student-topic-picker .section-title{margin:0 0 10px}.student-reading{max-width:790px}.student-question-meta{display:flex;align-items:center;gap:22px;color:var(--muted);margin:26px 0 22px;font-variant-numeric:tabular-nums}.student-bookmark{margin-left:auto;display:inline-flex;align-items:center;gap:7px;background:none;border:0;font:inherit;color:var(--muted);cursor:pointer;padding:8px}.student-bookmark.is-active{color:var(--accent)}.student-question-title{font-size:1.1875rem;font-weight:600;margin:0 0 10px;line-height:1.5}.student-question-text{font-size:1.125rem;line-height:1.8;margin:0;max-width:42em;text-wrap:pretty}.student-diagram{display:block;width:min(100%,600px);height:auto;margin:20px auto 24px;color:var(--ink);overflow:visible}.student-diagram text{font-family:inherit;font-size:16px}.student-options{display:grid;gap:0;margin-top:16px;border-top:1px solid var(--line)}.student-option{display:flex;align-items:center;gap:20px;min-height:58px;padding:15px 16px;text-align:start;background:none;border:0;border-bottom:1px solid var(--line);font:inherit;line-height:1.6;color:var(--ink);cursor:pointer;transition:background .18s var(--ease),color .18s var(--ease)}.student-option:hover:not(:disabled){background:rgba(167,46,42,.035)}.student-option.is-selected{background:rgba(167,46,42,.055)}.student-option-letter{display:grid;place-items:center;width:29px;height:29px;border:1px solid var(--line);border-radius:50%;flex:none;font-size:.875rem}.is-selected .student-option-letter{color:var(--surface-bright);background:var(--accent);border-color:var(--accent)}.student-option.is-correct{background:rgba(80,111,74,.07)}.is-correct .student-option-letter{color:#fff;background:#486b40;border-color:#486b40}.student-option.is-wrong .student-option-letter{background:var(--accent);border-color:var(--accent)}.student-option:disabled{cursor:default;opacity:1}.student-option-result{margin-left:auto;white-space:nowrap;color:#416438;font-size:.875rem}.student-buttons{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-top:26px}.student-inline-error{color:var(--accent);margin:14px 0 0}.student-hint{margin-top:22px;border-left:1px solid var(--accent);padding:1px 0 1px 18px;color:var(--muted)}.student-hint p{margin:4px 0;line-height:1.7}.student-hint strong{color:var(--ink);font-weight:600}.student-explanation{margin-top:28px;padding-top:23px;border-top:1px solid var(--line)}.student-explanation h3{font-size:1.1875rem;line-height:1.5;margin:0 0 12px}.student-explanation h3 span{font-size:1rem;font-weight:400;color:var(--muted);margin-left:20px}.student-explanation p{line-height:1.8;margin:10px 0;max-width:44em;text-wrap:pretty}.student-formula{font-size:1.125rem;overflow-wrap:break-word}.student-tabs{display:flex;gap:28px;border-bottom:1px solid var(--line);margin:24px 0 10px}.student-tab{font:inherit;background:none;border:0;position:relative;color:var(--muted);padding:10px 0 14px;cursor:pointer}.student-tab.is-active{color:var(--accent);font-weight:600}.student-tab.is-active:after{content:'';position:absolute;bottom:-1px;height:2px;left:0;right:0;background:var(--accent)}.student-detail-row{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:24px 0;border-bottom:1px solid var(--line)}.student-detail-row h2{font-size:1.125rem;font-weight:500;line-height:1.6;margin:0 0 5px}.student-detail-row p{color:var(--muted);line-height:1.6;margin:0}.student-row-actions{display:flex;align-items:center;gap:24px;flex:none}.student-muted-button{font:inherit;border:0;background:none;padding:8px 0;color:var(--muted);cursor:pointer}.student-muted-button:hover{color:var(--accent)}.student-undo{display:flex;gap:22px;align-items:center;padding:13px 0;color:var(--muted)}.student-challenge{max-width:790px;padding-top:24px}.student-challenge>h2{font-size:1.1875rem;line-height:1.5;margin:0 0 12px}.student-challenge-facts{display:flex;gap:48px;border-block:1px solid var(--line);padding:18px 0;margin-top:30px}.student-challenge-facts div{display:flex;gap:16px}.student-challenge-facts dt{color:var(--muted)}.student-challenge-facts dd{margin:0}.student-challenge>p{line-height:1.8}.student-challenge-note{color:var(--muted)}.student-profile-intro{display:flex;align-items:center;gap:20px;padding:22px 0}.student-avatar{width:52px;height:52px;display:grid;place-items:center;background:var(--surface-bright);border:1px solid var(--line);border-radius:50%;font-size:1.1875rem}.student-profile-intro h2{font-size:1.1875rem;margin:0 0 4px;line-height:1.5}.student-profile-intro p{color:var(--muted);margin:0}.student-profile-summary{display:flex;gap:34px;color:var(--muted);padding:22px 0;border-bottom:1px solid var(--line)}.student-profile-summary strong{color:var(--ink);font-weight:500;font-variant-numeric:tabular-nums}.student-settings{padding:28px 0;max-width:510px}.student-settings label{display:block;margin-bottom:10px}.student-name-row{display:flex;gap:14px}.student-name-row input{min-width:0;flex:1;box-sizing:border-box;font:inherit;font-size:1rem;color:var(--ink);background:var(--surface-bright);padding:10px 12px;border:1px solid var(--line);border-radius:6px;outline-offset:3px}.student-settings p{color:var(--muted);line-height:1.6}.student-role-row{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);margin-top:14px;padding-top:28px;gap:24px}.student-role-row h2{font-size:1.1875rem;line-height:1.5;margin:0 0 8px}.student-role-row p{margin:0;color:var(--muted);line-height:1.7}.student-result-list{margin:30px 0}.student-home .page-heading{font-size:1.625rem}.student-home .btn-primary{min-width:132px}.student-reading button:focus-visible,.student-home button:focus-visible,.student-tab:focus-visible,.student-row-actions button:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
@media(min-width:1400px){.student-open-row{grid-template-columns:minmax(0,1fr) 160px 118px}.student-home{max-width:1000px}}
@media(max-width:700px){.student-subjects{gap:26px;margin-bottom:30px}.student-heading{gap:14px}.student-heading>.text-link{margin-right:0;white-space:nowrap}.student-open-row{grid-template-columns:minmax(0,1fr) 48px 68px;gap:12px;min-height:54px}.student-open-row>.text-link{margin-right:0}.student-week{grid-template-columns:1fr auto;gap:10px}.student-week>span{grid-column:1;grid-row:2;color:var(--muted)}.student-week>.text-link{grid-column:2;grid-row:1 / 3;margin-right:0}.student-section{margin-top:32px}.student-detail-row{align-items:flex-start;gap:16px;padding:22px 0}.student-row-actions{flex-direction:column;gap:5px;align-items:flex-end}.student-detail-row p{font-size:.9375rem}.student-question-meta{gap:14px;margin-top:18px}.student-bookmark{padding-right:0}.student-question-text{font-size:1.125rem}.student-option{padding:14px 8px;gap:12px}.student-option-result{font-size:.8125rem}.student-challenge-facts{flex-direction:column;gap:10px}.student-challenge-facts dt{width:40px}.student-diagram{margin:20px auto}.student-explanation h3 span{display:block;margin:5px 0 0}.student-role-row{align-items:flex-start;flex-direction:column}.student-name-row{gap:9px}.student-profile-summary{gap:22px}.student-reading .student-heading .page-heading{font-size:1.5rem}}
@media(prefers-reduced-motion:reduce){.student-option{transition:none}}
.student-hint{border-left-width:1px}
.student-catalog{max-width:1000px}.student-catalog .page-heading{font-size:1.625rem}.student-catalog-search{display:flex;align-items:center;gap:12px;max-width:520px;margin:27px 0 30px;border-bottom:1px solid var(--line);color:var(--muted)}.student-catalog-search input{flex:1;min-width:0;padding:12px 0;font:inherit;color:var(--ink);background:none;border:0;outline-offset:4px}.student-catalog-search input::placeholder{color:var(--muted)}.student-catalog-search>.text-link{white-space:nowrap}.student-chapter{border-bottom:1px solid var(--line)}.student-chapter h2{margin:0;font-size:1.1875rem;font-weight:500}.student-chapter-heading{display:flex;align-items:center;justify-content:space-between;width:100%;padding:23px 0;font:inherit;line-height:1.6;text-align:start;color:var(--ink);background:none;border:0;cursor:pointer}.student-chapter-toggle{font-size:1.25rem;font-weight:400;color:var(--muted);padding-right:12px}.student-chapter-points{padding:0 0 16px;animation:student-catalog-reveal .18s ease-out}.student-chapter-points[hidden]{display:none}.student-point-row{display:grid;grid-template-columns:minmax(0,1fr) 150px 52px;align-items:center;gap:24px;width:100%;min-height:52px;padding:10px 12px 10px 0;font:inherit;font-size:1rem;line-height:1.65;text-align:start;color:var(--ink);background:none;border:0;cursor:pointer}.student-point-row:hover .student-point-name,.student-point-action{color:var(--accent)}.student-point-count{color:var(--muted);font-size:.9375rem;font-variant-numeric:tabular-nums}.student-point-action{text-align:right}.student-catalog button:focus-visible,.student-catalog input:focus-visible,.student-breadcrumb button:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.student-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin:0 0 26px;color:var(--muted);font-size:.9375rem;line-height:1.8}.student-breadcrumb .text-link{font-size:inherit;padding:0;color:var(--muted)}.student-breadcrumb [aria-current]{color:var(--ink)}.student-tabs{overflow-x:auto}.student-tab{white-space:nowrap}.student-catalog .empty-state{text-align:left;padding:35px 0}.student-catalog .empty-state h2{font-size:1.1875rem;font-weight:500}.student-reading .empty-state h2{font-size:1.1875rem;font-weight:500}.student-reading .empty-state p{color:var(--muted);line-height:1.8}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@keyframes student-catalog-reveal{from{opacity:0;transform:translateY(-3px)}to{opacity:1;transform:none}}
@media(max-width:700px){.student-catalog-search{margin:22px 0}.student-chapter-heading{padding:20px 0}.student-point-row{grid-template-columns:minmax(0,1fr) 95px 36px;gap:12px;min-height:55px;padding-right:0}.student-point-count{font-size:.875rem}.student-chapter-toggle{padding-right:0}.student-breadcrumb{gap:7px;margin-bottom:22px;font-size:.875rem}.student-point-name{overflow-wrap:anywhere}}
@media(prefers-reduced-motion:reduce){.student-chapter-points{animation:none}}

.student-tabs{overflow-x:auto;scrollbar-width:none}.student-tab{flex-shrink:0;white-space:nowrap}
.student-written-answer{display:grid;gap:10px;margin-top:20px;font:inherit;line-height:1.7}.student-written-answer textarea{display:block;box-sizing:border-box;width:100%;min-width:0;min-height:8rem;resize:vertical;padding:10px 12px;font:inherit;font-size:1rem;line-height:1.7;color:var(--ink);background:var(--surface-bright);border:1px solid var(--line);border-radius:6px;outline-offset:4px}.student-written-answer textarea:focus-visible{outline:2px solid var(--accent)}