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.2s,margin-left .2s}.wb-side-rail--collapsed~.main{width:calc(100vw - var(--wb-side-collapsed-width) - 80px);margin-left:calc(var(--wb-side-collapsed-width) + 40px)}.bg-mascot{-webkit-user-select:none;user-select:none;display:block}.bg-mascot--head{object-fit:cover;border-radius:999px;width:48px;height:48px}.bg-mascot--friend{object-fit:contain;width:min(240px,42vw);height:auto}.bg-brand{align-items:center;gap:12px;display:inline-flex}.bg-brand__head{filter:drop-shadow(0 2px #0000002e);width:52px;height:52px}.bg-brand__word{color:#fff;font-family:var(--font-dm-serif), Georgia, serif;font-size:clamp(28px,2.8vw,36px);line-height:1}.bg-brand--compact .bg-brand__head{width:42px;height:42px}.bg-friend-note{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:12px;display:grid}.bg-friend-note__bubble{border:1px solid var(--wb-line-strong);border-radius:var(--radius);background:#ffffffd1;min-width:0;padding:18px 20px;position:relative;box-shadow:0 12px 26px #061a330f}.bg-friend-note__bubble:after{content:"";border-right:1px solid var(--wb-line-strong);border-bottom:1px solid var(--wb-line-strong);background:#ffffffd1;width:22px;height:22px;position:absolute;bottom:30px;right:-16px;transform:rotate(-45deg)}.bg-friend-note__eyebrow{color:var(--wb-ink);margin-bottom:8px;font-size:14px;font-weight:800;display:block}.bg-friend-note__bubble p{z-index:1;color:var(--wb-gold-dark);margin:0;font-size:17px;font-weight:800;line-height:1.45;position:relative}.bg-friend-note__friend{filter:drop-shadow(0 15px 12px #061a332e);width:clamp(180px,22vw,280px);margin-bottom:-4px}.bg-friend-note--hero{min-height:250px}.bg-friend-note--hero .bg-friend-note__bubble{align-self:start}.bg-friend-note--hero .bg-friend-note__friend{width:clamp(220px,26vw,330px);margin-bottom:-10px;margin-right:-8px}.bg-friend-note__action{z-index:2;margin-top:18px;position:relative}.bg-empty-state{text-align:left;justify-content:center;align-items:center;gap:16px;display:flex}.bg-empty-state__mark{flex:none;width:56px;height:56px;box-shadow:0 6px 18px #061a331f}.bg-empty-state__copy{max-width:520px}.bg-empty-title{color:var(--wb-ink);margin:0 0 4px;font-size:16px;font-weight:800}.bg-empty-body{color:var(--wb-muted);margin:0;font-size:14px;line-height:1.55}.bg-empty-actions{margin-top:14px}.bg-reaction{align-items:center;gap:9px;display:inline-flex}.bg-reaction__mark{flex:none;width:30px;height:30px}.card{border:1px solid var(--wb-line);border-radius:var(--radius);box-shadow:var(--shadow);background:#fffdf8f0;padding:24px}.progress-wrap{background:#061a331f;border-radius:999px;width:100%;height:8px;overflow:hidden}.progress-fill{border-radius:inherit;background:linear-gradient(90deg, var(--wb-gold), #f4c65c);height:100%;transition:width .2s}.timer-pill{background:#ffffff14;border:1px solid #ffffff38;border-radius:999px;align-items:center;gap:8px;min-height:34px;padding:0 12px;display:inline-flex}.timer-dot{border-radius:999px;width:8px;height:8px}.q-nav{flex-wrap:wrap;gap:8px;margin-bottom:18px;display:flex}.q-dot{border:1px solid var(--wb-line);background:var(--wb-paper);width:34px;height:34px;color:var(--wb-muted);border-radius:999px;place-items:center;font-size:13px;font-weight:800;display:grid}.q-dot:hover,.q-dot.active{border-color:var(--wb-gold);color:var(--wb-navy)}.q-dot.active{background:var(--wb-gold-light)}.q-dot.correct{border-color:var(--wb-green);background:var(--wb-green-light);color:var(--wb-green-dark)}.q-dot.wrong{border-color:var(--wb-red);background:var(--wb-red-light);color:var(--wb-red-dark)}.q-dot.answered{border-color:var(--wb-line-strong);color:var(--wb-ink);background:#fff}.q-meta{color:var(--wb-muted);flex-wrap:wrap;gap:8px;margin-bottom:16px;font-size:13px;font-weight:700;display:flex}.passage{border-left:4px solid var(--wb-gold);border-radius:var(--radius-sm);color:var(--wb-ink);white-space:pre-wrap;background:#fffaf0;margin:18px 0;padding:18px;font-size:16px;line-height:1.7}.graphic-container{border:1px solid var(--wb-line);border-radius:var(--radius);background:#fff;margin:18px 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var(--wb-line-strong);width:34px;height:34px;color:var(--wb-ink);background:#fff;border-radius:999px;place-items:center;font-weight:800;display:grid}.choice.selected .choice-letter{border-color:var(--wb-gold);background:var(--wb-gold-light);color:var(--wb-gold-dark)}.choice.correct .choice-letter{border-color:var(--wb-green);background:var(--wb-green);color:#fff}.choice.wrong .choice-letter{border-color:var(--wb-red);background:var(--wb-red);color:#fff}.feedback{border-radius:var(--radius);margin-top:18px;padding:14px 16px;font-size:15px;font-weight:800;line-height:1.5}.feedback.correct{background:var(--wb-green-light);color:var(--wb-green-dark);border:1px solid #2f7d4647}.feedback.wrong{background:var(--wb-red-light);color:var(--wb-red-dark);border:1px solid #b8424247}.explanation-box{border:1px solid var(--wb-line);border-radius:var(--radius);color:var(--wb-ink);background:#fffaf0;margin-top:16px;padding:18px;font-size:15px;line-height:1.6}.video-section{margin-top:18px}.video-placeholder{border:1px dashed var(--wb-line-strong);border-radius:var(--radius);min-height:180px;color:var(--wb-muted);background:#fffaf0;place-items:center;display:grid}.video-placeholder .play-icon{font-size:32px}.btn-row{flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:20px;display:flex}.btn{border:1px solid var(--wb-line);border-radius:var(--radius);min-height:40px;color:var(--wb-ink);background:#fff;justify-content:center;align-items:center;gap:8px;padding:0 16px;font-size:14px;font-weight:800;text-decoration:none;transition:background .15s,border-color .15s,transform 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#061a333d}.study-notes-header,.study-notes-footer{background:#fffaf0;padding:16px}.study-notes-header{border-bottom:1px solid var(--wb-line);justify-content:space-between;align-items:flex-start;gap:14px;display:flex}.study-notes-title{color:var(--wb-ink);font-size:16px;font-weight:800}.study-notes-subtitle,.study-notes-meta{color:var(--wb-muted);flex-wrap:wrap;align-items:center;gap:8px 12px;font-size:12px;line-height:1.4;display:flex}.study-notes-indicator{background:var(--wb-gray-400);border-radius:999px;width:8px;height:8px}.study-notes-indicator.active{background:var(--wb-green)}.study-notes-close{border:1px solid var(--wb-line);width:32px;height:32px;color:var(--wb-ink);background:#fff;border-radius:999px;place-items:center;font-size:20px;display:grid}.study-notes-body{padding:16px;overflow:auto}.study-notes-bg-presence{border:1px solid var(--wb-line);border-radius:var(--radius);background:linear-gradient(135deg,#fffdf8 0%,#f7eed8 100%);grid-template-columns:minmax(0,1fr) auto;align-items:end;min-height:170px;margin-bottom:14px;display:grid;overflow:hidden}.study-notes-bg-copy{align-self:start;padding:16px 0 16px 16px}.study-notes-bg-copy span{color:var(--wb-ink);margin-bottom:6px;font-size:13px;font-weight:800;display:block}.study-notes-bg-copy p{max-width:180px;color:var(--wb-gold-dark);margin:0;font-size:15px;font-weight:800;line-height:1.4}.study-notes-bg-friend{filter:drop-shadow(0 14px 12px #061a3329);width:172px;margin-bottom:-8px;margin-right:-14px}.study-notes-tips{border:1px solid var(--wb-line);border-radius:var(--radius);background:#fff;margin-bottom:14px;padding:14px}.study-notes-kicker{color:var(--wb-ink);margin-bottom:8px;font-size:13px;font-weight:800}.study-notes-tips ul{color:var(--wb-muted);margin:0;padding-left:18px;font-size:13px;line-height:1.6}.study-notes-context{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.study-notes-pill{background:var(--wb-gold-light);color:var(--wb-gold-dark);border-radius:999px;padding:5px 9px;font-size:12px;font-weight:800}.study-notes-textarea{border:1px solid var(--wb-line);border-radius:var(--radius);resize:vertical;width:100%;min-height:260px;color:var(--wb-ink);outline:none;padding:14px;line-height:1.55}.study-notes-textarea:focus{border-color:var(--wb-gold);box-shadow:0 0 0 3px #d9aa3a33}.study-notes-footer{border-top:1px solid var(--wb-line)}.study-notes-actions{flex-wrap:wrap;justify-content:flex-end;gap:10px;margin-top:12px;display:flex}.study-notes-error{color:var(--wb-red-dark);margin-top:10px;font-size:13px;font-weight:700}@media (max-width:1100px){.wb-side-rail{display:none}.wb-side-rail~.main{width:min(100% - calc(var(--wb-page-gutter) * 2), var(--wb-page-standard));margin:24px auto 44px}}@media (max-width:760px){:root{--wb-nav-height:66px}.nav{grid-template-columns:1fr auto;gap:14px;padding:10px 14px}.bg-brand__head{width:44px;height:44px}.bg-brand__word{font-size:26px}.nav-tabs{order:3;grid-column:1/-1;gap:20px;padding-top:2px}.nav-actions{gap:8px}.nav-avatar{width:34px;height:34px;font-size:12px}.nav-logout{display:none}.main,.main--catalog,.main--standard,.main--narrow,.main--form{width:min(100% - 24px,100%);margin-top:18px}.card{padding:18px}.choice{min-height:64px;padding:14px;font-size:15px}.bg-friend-note{grid-template-columns:1fr}.bg-friend-note__bubble:after{display:none}.bg-friend-note__friend{justify-self:end;width:150px}.bg-friend-note--hero{min-height:0}.bg-friend-note--hero .bg-friend-note__friend{width:170px;margin-right:0}.bg-empty-state{align-items:flex-start}.study-notes-launcher{border-radius:999px;width:auto;height:42px;min-height:42px;padding:0 14px;bottom:12px;right:12px}.study-notes-panel{width:auto;max-height:min(78vh,640px);inset:auto 12px 12px}.study-notes-bg-presence{min-height:145px}.study-notes-bg-friend{width:138px}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}