.shell{--rail-width: 248px;min-height:100vh}.rail{position:fixed;inset:0 auto 0 0;box-sizing:border-box;width:var(--rail-width);display:flex;flex-direction:column;gap:var(--space-2);padding:18px 14px;background:var(--surface-primary);border-right:1px solid var(--border-card);overflow-y:auto;z-index:20}.rail__brand{display:flex;align-items:center;gap:10px;padding:0 8px;text-decoration:none;min-height:44px}.rail__wordmark{font-family:var(--font-display);font-weight:600;font-size:19px;color:var(--navy-900)}.rail__nav{flex:1}.rail__nav ul{list-style:none;margin:0;padding:0}.rail__group+.rail__group{margin-top:var(--space-2)}.rail__grouptitle{margin:0 0 6px;padding:0 10px;font:600 12px var(--font-ui);letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted)}.rail__link{display:flex;align-items:center;gap:10px;min-height:44px;padding:0 10px;margin-bottom:2px;border-radius:var(--radius-nav);color:var(--slate-700);font:600 15px var(--font-ui);text-decoration:none}.rail__link:hover{background:var(--fill-subtle);color:var(--navy-900)}.rail__icon{flex:none;color:var(--text-muted)}.rail__link--active{background:var(--chip-demonstrated-bg);color:var(--teal-700);box-shadow:inset 2px 0 0 var(--teal-700)}.rail__link--active .rail__icon{color:var(--teal-700)}.rail__empty{margin:0;padding:0 10px;color:var(--text-muted);font-size:14px;line-height:1.55}.usercard{position:relative;border-top:1px solid var(--border-card);padding-top:12px}.usercard__button{display:flex;align-items:center;gap:10px;width:100%;min-height:52px;padding:6px 8px;border:none;border-radius:var(--radius-button);background:transparent;text-align:left;cursor:pointer;font:inherit}.usercard__button:hover{background:var(--fill-subtle)}.usercard__avatar{flex:none;display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--radius-pill);background:var(--teal-700);color:#fff;font:700 14px var(--font-ui)}.usercard__text{min-width:0;display:flex;flex-direction:column}.usercard__name{font:600 14.5px var(--font-ui);color:var(--navy-900);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.usercard__role{font-size:12.5px;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.usercard__chevron{flex:none;margin-left:auto;color:var(--text-muted)}.usercard__menu{position:absolute;left:0;right:0;bottom:calc(100% + 6px);display:flex;flex-direction:column;gap:6px;padding:10px;background:var(--surface-primary);border:1px solid var(--border-card);border-radius:var(--radius-button);box-shadow:0 6px 20px #17255424;z-index:30}.usercard__email{margin:0 4px 2px;font-size:12.5px;color:var(--text-muted);overflow-wrap:anywhere}.usercard__item{display:flex;align-items:center;gap:10px;min-height:44px;padding:0 8px;border-radius:var(--radius-nav);color:var(--navy-900);font:600 15px var(--font-ui);text-decoration:none}.usercard__item:hover{background:var(--fill-subtle)}.usercard__lang{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:4px 8px}.usercard__langlabel{font-size:13.5px;color:var(--text-muted)}.usercard__signout{display:flex}.usercard__signout .topbar__signout{width:100%}.rail__badge{margin-left:auto;min-width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;padding:0 6px;border-radius:var(--radius-pill);background:var(--chip-next-bg);border:1px solid var(--chip-next-border);color:var(--chip-next-text);font:700 12.5px var(--font-ui)}.shell__main{margin-left:var(--rail-width);min-height:100vh}.classbar{position:sticky;top:0;z-index:12;display:flex;align-items:center;gap:14px;min-height:60px;padding:8px 28px;background:var(--surface-primary);border-bottom:1px solid var(--border-card)}.classbar__spacer{flex:1}.classbar__scope{flex:0 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;color:var(--text-muted)}.classbar__role{display:inline-flex;align-items:center;gap:7px;flex:none;height:var(--touch-target-teacher);padding:0 12px;border:1.5px solid var(--border-card);border-radius:var(--radius-nav);background:var(--surface-soft);font:600 14px var(--font-ui);color:var(--slate-700)}.classbar__switcher{position:relative}.classbar__class{display:flex;align-items:center;gap:10px;min-height:44px;padding:4px 10px;border:none;border-radius:var(--radius-nav);background:transparent;cursor:pointer;font:inherit;color:var(--navy-900)}.classbar__class:hover{background:var(--fill-subtle)}.classbar__chip{display:inline-flex;align-items:center;padding:4px 12px;border-radius:var(--radius-nav);background:var(--navy-900);color:var(--cloud-50);font:700 15px var(--font-ui);letter-spacing:.02em}.classbar__meta{font:600 14.5px var(--font-ui);color:var(--slate-700)}.classbar__menu{position:absolute;top:calc(100% + 6px);left:0;min-width:220px;margin:0;padding:8px;list-style:none;background:var(--surface-primary);border:1px solid var(--border-card);border-radius:var(--radius-button);box-shadow:0 6px 20px #17255424;z-index:30}.classbar__option{display:flex;align-items:baseline;gap:10px;width:100%;min-height:44px;padding:0 10px;border:none;border-radius:var(--radius-nav);background:transparent;cursor:pointer;font:inherit;color:var(--navy-900);text-align:left}.classbar__option:hover{background:var(--fill-subtle)}.classbar__option--active{background:var(--chip-demonstrated-bg);color:var(--teal-700)}.classbar__option span{font-size:13px;color:var(--text-muted)}.classbar__live{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--text-muted)}.classbar__livedot{width:8px;height:8px;border-radius:var(--radius-pill);background:var(--text-disabled)}.classbar__live--active{color:var(--teal-700);font-weight:600}.classbar__live--active .classbar__livedot{background:var(--teal-500)}.classbar__search{position:relative;display:flex;align-items:center}.classbar__search>svg{position:absolute;left:12px;color:var(--text-muted);pointer-events:none}.classbar__search input{width:220px;height:var(--touch-target-teacher);padding:0 12px 0 36px;border:1.5px solid var(--border-neutral);border-radius:var(--radius-nav);background:var(--surface-primary);font:500 14.5px var(--font-ui);color:var(--navy-900)}.classbar__search input::placeholder{color:var(--text-disabled)}.classbar__results{position:absolute;top:calc(100% + 6px);right:0;min-width:260px;margin:0;padding:8px;list-style:none;background:var(--surface-primary);border:1px solid var(--border-card);border-radius:var(--radius-button);box-shadow:0 6px 20px #17255424;z-index:30}.classbar__results button{display:flex;align-items:center;gap:10px;width:100%;min-height:44px;padding:0 10px;border:none;border-radius:var(--radius-nav);background:transparent;cursor:pointer;font:600 14.5px var(--font-ui);color:var(--navy-900);text-align:left}.classbar__results button:hover{background:var(--fill-subtle)}.classbar__noresult{padding:10px;font-size:14px;color:var(--text-muted)}.classbar__avatar{flex:none;display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:var(--radius-pill);background:var(--fill-subtle);color:var(--slate-700);font:700 12px var(--font-ui)}.classbar--term{color:var(--text-muted);font-size:14.5px}.classbar__term{font-weight:600}@media(max-width:899px){.classbar{padding:8px 12px;overflow-x:auto}.classbar__scope{display:none}.classbar__search input{width:150px}}.classbar--narrow{flex-direction:column;align-items:stretch;gap:6px;overflow:visible}.classbar__row{display:flex;align-items:center;gap:9px}.classbar__note{margin:0;font:400 12px/1.35 var(--font-ui);color:var(--text-muted)}.classbar__sheetbutton{min-height:var(--touch-target-teacher);padding:0 12px;border:1.5px solid var(--border-neutral);border-radius:var(--radius-nav);background:var(--surface-primary);font:600 13px var(--font-ui);color:var(--navy-900);cursor:pointer}.classbar__sheet{display:flex;flex-direction:column;gap:10px;padding:12px 0 4px;border-top:1px solid var(--border-card)}.classbar--narrow .classbar__scope{display:block}.classbar--narrow .classbar__search input{width:100%}@media print{.classbar{display:none!important}}.shell__mobilebar,.shell__scrim{display:none}@media(max-width:899px){.shell__mobilebar{position:sticky;top:0;z-index:15;display:flex;align-items:center;gap:10px;height:56px;padding:0 12px;background:var(--surface-primary);border-bottom:1px solid var(--border-card)}.shell__hamburger{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:none;border-radius:var(--radius-nav);background:var(--fill-subtle);color:var(--navy-900);cursor:pointer}.shell__mobilebrand{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font:600 17px var(--font-display);color:var(--navy-900)}.shell__mobilewho{margin-left:auto;max-width:40%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;color:var(--text-muted)}.rail{transform:translate(-100%);visibility:hidden;transition:transform .18s ease-out;box-shadow:0 0 24px #1725542e}.shell--drawer-open .rail{transform:translate(0);visibility:visible}.shell__scrim{display:block;position:fixed;inset:0;z-index:18;background:#17255459}.shell__main{margin-left:0}}.offline-pill{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;padding:8px 16px;background:var(--navy-900);color:var(--cloud-50);font-size:var(--text-label-min);line-height:1.5}.offline-pill__label{font-weight:700}.offline-pill__note{color:var(--ondark-body)}.pub{max-width:780px;margin:0 auto;padding:var(--space-3) var(--space-3) 64px}.pub-skip{position:absolute;left:-9999px;top:0;background:var(--surface-primary);color:var(--navy-900);border:1.5px solid var(--navy-900);border-radius:var(--radius-sm);padding:0 16px;min-height:44px;display:inline-flex;align-items:center;font:600 15px var(--font-ui);z-index:10}.pub-skip:focus{left:var(--space-2);top:var(--space-1)}.pub-header{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:var(--space-2) 0 var(--space-3);border-bottom:1px solid var(--border-card)}.pub-header__logo{display:flex;align-items:center;min-height:44px;gap:10px;text-decoration:none}.pub-header__wordmark{font-family:var(--font-display);font-weight:600;font-size:19px;color:var(--navy-900)}.pub-header__spacer{flex:1 1 auto}.pub-header__login{font:600 14.5px var(--font-ui);color:var(--teal-700);text-decoration:none;border:1.5px solid var(--border-neutral);border-radius:var(--radius-nav);padding:0 16px;min-height:44px;display:inline-flex;align-items:center}.pub-header__login:hover{border-color:var(--teal-700)}.pub h1{font-family:var(--font-display);font-weight:600;font-size:30px;line-height:1.25;margin:var(--space-4) 0 var(--space-1);color:var(--navy-900)}.pub-meta{display:flex;flex-wrap:wrap;gap:6px 16px;margin:0 0 var(--space-3);font-size:14px;color:var(--text-muted)}.pub-lede{font-size:17px;line-height:1.65;color:var(--slate-700);margin:0 0 var(--space-2)}.pub-draft{background:var(--tint-warning-card);border:1.5px solid var(--chip-next-border);border-left-width:5px;border-radius:var(--radius-map);padding:16px 20px;margin:0 0 var(--space-3)}.pub-draft__title{margin:0 0 6px;font:700 15px var(--font-ui);color:var(--text-warning-dark);display:flex;align-items:center;gap:8px}.pub-draft p{margin:0 0 8px;font-size:15px;line-height:1.6;color:var(--slate-700)}.pub-draft p:last-child{margin-bottom:0}.pub-section{margin:var(--space-4) 0 0}.pub-section h2{font-size:21px;line-height:1.35;margin:0 0 var(--space-1);color:var(--navy-900);scroll-margin-top:var(--space-2)}.pub-section h3{font-size:16.5px;margin:var(--space-3) 0 6px;color:var(--navy-900)}.pub-section p{font-size:16px;line-height:1.7;color:var(--slate-700);margin:0 0 var(--space-2)}.pub-section ul,.pub-section ol{margin:0 0 var(--space-2);padding-left:22px;font-size:16px;line-height:1.7;color:var(--slate-700)}.pub-section li{margin-bottom:8px}.pub-section li>strong{color:var(--navy-900)}.pub-note{border-left:3px solid var(--border-neutral);background:var(--fill-subtle);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:12px 16px;margin:0 0 var(--space-2);font-size:15px;line-height:1.65;color:var(--text-no-evidence)}.pub-note--strong{border-left-color:var(--amber-500);background:var(--tint-warning-card);color:var(--slate-700)}.pub-tablewrap{overflow-x:auto;margin:0 0 var(--space-2);border:1px solid var(--border-card);border-radius:var(--radius-sm);background:var(--surface-primary)}.pub-table{width:100%;min-width:460px;border-collapse:collapse;font-size:15px}.pub-table caption{text-align:left;padding:10px 14px 0;font-size:13.5px;color:var(--text-muted)}.pub-table th,.pub-table td{text-align:left;vertical-align:top;padding:10px 14px;border-bottom:1px solid var(--fill-subtle);line-height:1.55}.pub-table thead th{font-size:13px;font-weight:700;color:var(--text-muted);border-bottom:1px solid var(--border-card)}.pub-table tbody tr:last-child td{border-bottom:none}.pub-table td:first-child{color:var(--navy-900);font-weight:600}.pub-contact{border:1px solid var(--border-card);border-radius:var(--radius-map);background:var(--surface-primary);padding:16px 20px;margin:0 0 var(--space-2);box-shadow:var(--shadow-card)}.pub-contact dl{margin:0}.pub-contact dt{font:600 13.5px var(--font-ui);color:var(--text-muted);margin-top:10px}.pub-contact dt:first-child{margin-top:0}.pub-contact dd{margin:2px 0 0;font-size:16px}.pub-contact dd a{display:inline-flex;align-items:center;min-height:44px;padding-right:4px}.pub-placeholder-flag{display:inline-block;margin-left:8px;padding:2px 8px;border:1.5px dashed var(--text-disabled);border-radius:var(--radius-pill);font:600 12px var(--font-ui);color:var(--text-no-evidence);vertical-align:middle}.pub-links{margin:var(--space-3) 0 0;padding:14px 16px;background:var(--fill-subtle);border-radius:var(--radius-nav)}.pub-links__label{margin:0 0 6px;font:600 14px var(--font-ui);color:var(--text-muted)}.pub-links ul{list-style:none;margin:0;padding:0}.pub-links li{margin:0}.pub-links a{display:flex;align-items:center;min-height:44px;font:600 15.5px var(--font-ui);color:var(--teal-700)}.pub-crosslinks{margin:var(--space-4) 0 0;padding-top:var(--space-3);border-top:1px solid var(--border-card)}.pub-crosslinks h2{font-size:15px;color:var(--text-muted);margin:0 0 10px}.pub-crosslinks h2+ul{margin-bottom:var(--space-3)}.pub-crosslinks ul:last-child{margin-bottom:0}.pub-crosslinks ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.pub-crosslinks a{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;border:1.5px solid var(--border-neutral);border-radius:var(--radius-nav);font:600 14.5px var(--font-ui);text-decoration:none;color:var(--teal-700)}.pub-crosslinks a:hover{border-color:var(--teal-700)}.pub-crosslinks a[aria-current=page]{background:var(--fill-subtle);border-color:var(--navy-900);color:var(--navy-900)}.public-footer{max-width:660px;margin:0 auto var(--space-4);padding:0 var(--space-3);text-align:center}.public-footer ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 6px}.public-footer a{display:inline-flex;align-items:center;min-height:44px;padding:0 10px;font-size:13.5px;color:var(--text-muted);text-decoration:underline}.public-footer a:hover{color:var(--teal-700)}@media(max-width:560px){.pub{padding-left:var(--space-2);padding-right:var(--space-2)}.pub h1{font-size:25px}.pub-section h2{font-size:19px}}.identity-buttons{display:flex;flex-direction:column;gap:10px;margin-top:16px}.identity-button{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:var(--touch-target);padding:0 16px;border:1px solid transparent;border-radius:var(--radius-button);font:600 16px var(--font-ui);cursor:pointer}.identity-button svg{flex:0 0 auto}.identity-button--apple{background:#000;color:#fff}.identity-button--google{background:#fff;color:#1f1f1f;border-color:#747775}.identity-button:disabled{opacity:.6;cursor:default}.student-page{max-width:720px;margin:0 auto;padding:var(--space-3) var(--space-2) var(--space-4);font-size:var(--text-student-body);line-height:var(--leading-student);color:var(--slate-700)}.student-page h1{font-family:var(--font-display);font-weight:600;font-size:var(--text-student-heading);line-height:var(--leading-student-heading);color:var(--navy-900);margin:0 0 var(--space-1)}.student-page h2{font-size:20px;color:var(--navy-900);margin:0 0 var(--space-1)}@media(min-width:768px){.student-page{max-width:620px;padding:44px 40px var(--space-4)}}@media(min-width:900px){.student-page{max-width:640px;padding-top:34px}}.stage-cue{display:flex;align-items:baseline;gap:10px;margin-bottom:var(--space-2)}.stage-cue .stage-cue__kicker{font-family:var(--font-ui);font-size:14px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--teal-700);margin:0}.stage-cue .stage-cue__title{font-family:var(--font-ui);font-weight:700;font-size:20px;color:var(--navy-900);margin:0 0 var(--space-1)}.no-help-mode .stage-cue__kicker{color:var(--navy-900)}.proof-banner{display:flex;align-items:center;gap:12px;background:var(--navy-900);color:var(--cloud-50);border-radius:var(--radius-map);padding:12px 18px;margin-bottom:var(--space-2);font-size:15.5px}.proof-banner__label{font-weight:800;letter-spacing:.08em;font-size:14px;border:1.5px solid var(--ondark-muted);border-radius:var(--radius-pill);padding:3px 10px;white-space:nowrap}.student-card{background:var(--surface-primary);border:1px solid var(--border-card);border-radius:var(--radius-card);padding:22px 24px;box-shadow:var(--shadow-card);margin-bottom:var(--space-2)}.no-help-mode .student-card{border:2px solid var(--navy-900)}.student-page .chip{font-size:var(--text-label-min)}.home-grid{display:grid;gap:var(--space-2)}.home-card__q{font-size:14px;font-weight:700;color:var(--text-muted);letter-spacing:.04em;text-transform:uppercase;margin-bottom:6px}.home-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:var(--space-2)}.item-stem{font-size:20px;color:var(--navy-900);margin-bottom:var(--space-2)}.math-input{height:var(--touch-target);font-size:var(--text-math);font-family:var(--font-ui);border:1.5px solid var(--border-neutral);border-radius:var(--radius-button);padding:0 14px;color:var(--navy-900);width:100%;max-width:340px}.answer-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:var(--space-2);align-items:center}.option-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}.option-btn{display:flex;align-items:flex-start;gap:12px;width:100%;min-height:var(--touch-target);text-align:left;font-size:18px;font-family:var(--font-ui);color:var(--navy-900);background:var(--surface-primary);border:1.5px solid var(--border-neutral);border-radius:var(--radius-button);padding:11px 14px;cursor:pointer}.option-btn[aria-pressed=true]{border-color:var(--teal-700);box-shadow:inset 0 0 0 1.5px var(--teal-700);background:var(--chip-demonstrated-bg)}.no-help-mode .option-btn[aria-pressed=true]{border-color:var(--navy-900);box-shadow:inset 0 0 0 1.5px var(--navy-900);background:var(--fill-subtle)}.option-btn__key{font-weight:700;color:var(--text-muted);border:1px solid var(--border-card);border-radius:8px;min-width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;font-size:15px;flex:none}.option-btn__text{white-space:pre-line}.option-btn__tick{margin-left:auto;padding-left:12px;font-weight:700;font-size:20px;line-height:1;color:var(--teal-700);flex:none}.no-help-mode .option-btn__tick{color:var(--navy-900)}.option-btn--answer,.option-btn--answer[aria-pressed=true],.no-help-mode .option-btn--answer[aria-pressed=true]{border-color:var(--teal-700);box-shadow:inset 0 0 0 1.5px 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