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20px;display:flex}.thread-head strong{font-size:1rem;font-weight:800}.thread-scroll{scrollbar-width:thin;flex-direction:column;flex:1;gap:10px;min-height:300px;max-height:calc(100dvh - 320px);padding:22px 20px;display:flex;overflow-y:auto}.bubble-row{justify-content:flex-start;display:flex}.bubble-row.mine{justify-content:flex-end}.bubble{background:var(--surface-2);border:1px solid var(--stroke);border-radius:16px;max-width:74%;padding:11px 15px}.bubble-row.mine .bubble{background:linear-gradient(135deg,#ffd50038,#ffb80024);border-color:#ffd50059}.bubble p{white-space:pre-wrap;word-break:break-word;margin:0;font-size:.94rem;line-height:1.45}.bubble time{color:var(--muted);margin-top:5px;font-size:.68rem;display:block}.thread-composer{border-top:1px solid var(--stroke);background:var(--surface-2);padding:14px 16px}.composer{align-items:flex-end;gap:10px;display:flex}.composer-input{resize:none;background:var(--bg-2);border:1px solid var(--stroke-strong);min-height:44px;max-height:160px;color:var(--text);border-radius:14px;flex:1;padding:12px 14px;font-size:.94rem;line-height:1.4;transition:border-color .2s,box-shadow .2s}.composer-input:focus{border-color:var(--yellow);outline:none;box-shadow:0 0 0 3px #ffd50029}.composer-disabled{color:var(--muted);text-align:center;font-size:.88rem}.composer-disabled p{margin:0}@media (max-width:900px){.book-layout{grid-template-columns:1fr}.book-aside{position:static}.messages-shell{grid-template-columns:1fr}.session-card{grid-template-columns:1fr;gap:12px}.session-actions{justify-content:flex-start}}[data-theme=light]{--bg:#f6f4ee;--bg-2:#fff;--surface:#14120809;--surface-2:#1412080f;--surface-3:#1412081a;--stroke:#1412081f;--stroke-strong:#14120838;--text:#17161c;--muted:#5f5e6b;--yellow-soft:#ffc40029;--yellow-ink:#8f6b00;--green:#1d8a4a;--red:#c43d3d;--shadow-glow:0 0 60px #ffd50033}[data-theme=light] .grain{opacity:.12}[data-theme=light] 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.quiz-result.pass{background:radial-gradient(120% 120% at 50% 0%, #1d8a4a1a, transparent 55%), var(--surface-2);border-color:#1d8a4a66}[data-theme=light] .quiz-result.fail{background:radial-gradient(120% 120% at 50% 0%, #c43d3d14, transparent 55%), var(--surface-2);border-color:#c43d3d66}[data-theme=light] .opt.correct{background:#1d8a4a14;border-color:#1d8a4a80}[data-theme=light] .opt.wrong{background:#c43d3d14;border-color:#c43d3d80}[data-theme=light] .bubble-row.mine .bubble{background:linear-gradient(135deg,#ffd50052,#ffb8002e)}[data-theme=light] .landing-glyphs span{color:#8f6b0024}[data-theme=light] .ledger-delta.neg{color:var(--muted)}.theme-toggle{text-align:left;background:0 0;width:100%}.user-chip-link{border:1px solid #0000;transition:background .2s,border-color .2s}.user-chip-link:hover{background:var(--surface);border-color:var(--stroke)}.user-chip .avatar 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small{color:var(--muted);font-size:.78rem}.switch-row{border-bottom:1px solid var(--stroke);justify-content:space-between;align-items:center;gap:16px;padding:14px 0;display:flex}.switch-row:last-child{border-bottom:0}.switch-row .sw-meta{line-height:1.4}.switch-row .sw-meta strong{font-size:.95rem;font-weight:700;display:block}.switch-row .sw-meta small{color:var(--muted);font-size:.82rem}.switch{flex:none;width:46px;height:26px;display:inline-block;position:relative}.switch input{opacity:0;cursor:pointer;z-index:2;margin:0;position:absolute;inset:0}.switch i{background:var(--surface-3);border:1px solid var(--stroke-strong);border-radius:999px;transition:background .25s,border-color .25s;position:absolute;inset:0}.switch i:after{content:"";background:var(--text);opacity:.75;width:20px;height:20px;transition:transform .25s var(--ease), background .25s, opacity .25s;border-radius:50%;position:absolute;top:2px;left:2px}.switch input:checked+i{background:linear-gradient(135deg, 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--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 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