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var(--font-scale));margin:0;font-weight:600;line-height:1.3}.muted{color:var(--text-muted)}.muted2{color:var(--text-muted-2)}.small{font-size:calc(var(--fs-small) * var(--font-scale))}.caption{font-size:calc(var(--fs-caption) * var(--font-scale));color:var(--text-muted-2)}.row{align-items:center;gap:10px;display:flex}.row--between{justify-content:space-between}.stack{flex-direction:column;gap:12px;display:flex}.grid2{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;display:grid}.prose{font-family:var(--font-read);font-size:calc(17.5px * var(--font-scale));color:var(--text);line-height:1.7}.prose p{margin:0 0 .9em}.prose strong{color:var(--text);font-weight:650}.prose ul,.prose ol{margin:0 0 .9em;padding-left:1.3em}.prose h1,.prose h2,.prose h3{font-family:var(--font-ui);letter-spacing:-.015em;margin:.6em 0 .4em}.prose code{font-family:var(--font-mono);background:var(--surface-2);border-radius:6px;padding:1px 6px;font-size:.9em}.prose .katex-display{margin:.6em 0 1em;overflow-x:auto}.prose .katex{font-size:1.08em}.prose blockquote{border-left:3px solid var(--accent);background:var(--accent-dim);border-radius:0 10px 10px 0;margin:0 0 .9em;padding:8px 14px}.glossary-term{border-bottom:1.5px dotted var(--accent);cursor:help}.callout{border:1px solid var(--border);background:var(--surface);border-radius:16px;margin-bottom:14px;padding:14px 16px}.callout--definition{background:var(--accent-dim);border-color:#6c7cff73}.callout--warning{background:#ffb02014;border-color:#ffb02073}.callout--example{background:#34d8b014;border-color:#34d8b073}.callout--tip{background:#5ac8fa14;border-color:#5ac8fa73}.callout--anchor_question{background:#d45d9b14;border-color:#d45d9b73}.callout__label{font-family:var(--font-ui);letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:6px;font-size:11px;font-weight:700}.player{background:var(--bg);flex-direction:column;height:100dvh;display:flex}.player__top{padding:calc(var(--safe-top) + 8px) 12px 8px;border-bottom:1px solid var(--border);flex:none;align-items:center;gap:10px;display:flex}.player__top .et-dots{flex:1;justify-content:center}.player__stage{scrollbar-width:none;flex:auto;min-height:0;padding:18px 16px 24px;overflow-y:auto}.player__stage::-webkit-scrollbar{display:none}.player__tutorbar{border-top:1px solid var(--border);background:var(--surface);flex:none;padding:8px 12px}.player__tutorbar-row{cursor:pointer;align-items:center;gap:10px;padding:4px 2px;display:flex}.player__tutorbar-row span{color:var(--text-muted);flex:1;font-size:14px}.player__chips{scrollbar-width:none;gap:6px;padding:6px 0 2px;display:flex;overflow-x:auto}.player__chips::-webkit-scrollbar{display:none}.player__footer{padding:10px 14px calc(var(--safe-bottom) + 12px);background:var(--surface);flex:none;align-items:center;gap:10px;display:flex}.player__footer .et-btn--primary{flex:1}.block-title{font-family:var(--font-ui);font-size:calc(var(--fs-h2) * var(--font-scale));letter-spacing:-.015em;margin:0 0 12px;font-weight:650;line-height:1.25}.block-enter{animation:block-in .18s var(--ease)}@keyframes block-in{0%{opacity:0;transform:translateY(8px)}}.required-ring{flex:none;width:26px;height:26px;position:relative}.required-ring svg{transform:rotate(-90deg)}.timebox{font-variant-numeric:tabular-nums;color:var(--text-muted-2);font-size:12px}.desk-player{grid-template-columns:1fr;gap:0;height:100dvh;display:grid}.desk-player--wide{grid-template-columns:1fr 360px}.desk-player .player{border-right:1px solid var(--border)}.desk-player .player__stage{padding:28px 40px 40px}.desk-player .player__stage>.block-enter{max-width:900px;margin:0 auto}.chat{flex-direction:column;flex:auto;min-height:0;display:flex}.chat__log{flex-direction:column;flex:auto;gap:10px;min-height:0;padding:12px 14px;display:flex;overflow-y:auto}.bubble{white-space:pre-wrap;word-break:break-word;border-radius:18px;max-width:86%;padding:10px 14px;font-size:15px;line-height:1.5}.bubble--tutor{background:var(--surface-2);border-bottom-left-radius:6px;align-self:flex-start}.bubble--student{background:var(--accent);color:#fff;border-bottom-right-radius:6px;align-self:flex-end}.bubble--system{color:var(--text-muted-2);background:0 0;align-self:center;font-size:12.5px}.bubble .ref{background:var(--accent-dim);color:#c7ccff;cursor:pointer;border:1px solid #6c7cff59;border-radius:999px;align-items:center;gap:4px;margin-top:6px;padding:3px 10px;font-size:12px;display:inline-flex}.chat__composer{padding:10px 12px calc(var(--safe-bottom) + 10px);border-top:1px solid var(--border);background:var(--surface);align-items:flex-end;gap:8px;display:flex}.chat__composer textarea{resize:none;flex:1;min-height:44px;max-height:120px}.chat__head{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:10px 14px;display:flex}.chat__head b{font-size:15px}.typing{gap:4px;padding:6px 2px;display:inline-flex}.typing i{background:var(--text-muted-2);border-radius:50%;width:6px;height:6px;animation:1.2s infinite typing}.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}@keyframes typing{30%{opacity:1;transform:translateY(-4px)}}.voice-btn{border:1px solid var(--border);background:var(--surface-2);width:44px;height:44px;color:var(--text);cursor:pointer;border-radius:50%;flex:none;justify-content:center;align-items:center;display:inline-flex}.voice-btn.is-rec{background:var(--danger);color:#fff;border-color:#0000;animation:1s infinite et-pulse}.lesson-row{border-bottom:1px solid var(--border);cursor:pointer;align-items:center;gap:12px;padding:12px 4px;display:flex}.lesson-row:last-child{border-bottom:none}.lesson-row.is-locked{opacity:.5}.glyph{border:2px solid var(--text-muted-2);border-radius:50%;flex:none;justify-content:center;align-items:center;width:22px;height:22px;font-size:12px;display:inline-flex}.glyph--in_progress{background:linear-gradient(90deg,var(--accent) 50%,transparent 50%);border-color:var(--accent)}.glyph--content_completed,.glyph--assessed{background:var(--accent-2);border-color:var(--accent-2);color:#06201a}.glyph--mastered{background:var(--warn);border-color:var(--warn);color:#2a1a00}.glyph--review_due{border-color:var(--warn);color:var(--warn)}.glyph--locked{border-color:var(--border);color:var(--text-muted-2)}[data-focus=true] .et-streak,[data-focus=true] .player__chips{display:none}.hero-num{letter-spacing:-.03em;font-size:44px;font-weight:800;line-height:1}.kpi{grid-template-columns:repeat(3,1fr);gap:8px;display:grid}.kpi>div{background:var(--surface-2);text-align:center;border-radius:14px;padding:12px 10px}.kpi b{letter-spacing:-.02em;font-size:20px;display:block}.kpi span{color:var(--text-muted);font-size:11.5px}.settings-row{border-bottom:1px solid var(--border);cursor:pointer;align-items:center;gap:12px;padding:14px 4px;display:flex}.settings-row:last-child{border-bottom:none}.settings-row svg{color:var(--text-muted)}.settings-row span{flex:1}.heat{grid-template-columns:repeat(15,1fr);gap:4px;display:grid}.heat i{aspect-ratio:1;background:var(--surface-3);border-radius:4px;display:block}.range{width:100%;accent-color:var(--accent)}.bar-row{grid-template-columns:1fr auto;align-items:center;gap:8px;margin:8px 0;font-size:14px;display:grid}.flashcard{perspective:1000px;cursor:pointer;min-height:180px}.flashcard__inner{width:100%;min-height:180px;transition:transform var(--dur-slow) var(--ease);transform-style:preserve-3d;position:relative}.flashcard.is-flipped .flashcard__inner{transform:rotateY(180deg)}.flashcard__face{backface-visibility:hidden;text-align:center;border:1px solid var(--border);background:var(--surface);border-radius:18px;justify-content:center;align-items:center;padding:20px;font-size:18px;display:flex;position:absolute;inset:0}.flashcard__face--back{background:var(--accent-dim);font-size:15.5px;line-height:1.5;transform:rotateY(180deg)}.step{border-left:3px solid var(--border);background:var(--surface);border-radius:0 12px 12px 0;margin:0 0 8px;padding:8px 14px}.step.is-revealed{border-color:var(--accent)}.step__expr{font-family:var(--font-mono);color:var(--text);font-size:16px}.step__expl{color:var(--text-muted);margin-top:4px;font-size:14px;line-height:1.5}.xr-banner{background:linear-gradient(135deg,#6c7cff2e,#34d8b01f);border:1px solid #6c7cff59;border-radius:14px;align-items:center;gap:10px;padding:10px 12px;font-size:13.5px;display:flex}.slideshow{aspect-ratio:16/9;background:#000;border-radius:16px;position:relative;overflow:hidden}.slideshow img{object-fit:cover;width:100%;height:100%}.slideshow__text{color:#fff;background:linear-gradient(#0000,#000000d9);padding:14px 16px;font-size:16px;font-weight:600;position:absolute;bottom:0;left:0;right:0}.slideshow__placeholder{color:#9aa6b4;text-align:center;background:radial-gradient(600px 300px at 30% 20%,#1c2436,#0e1116);justify-content:center;align-items:center;width:100%;height:100%;padding:24px;font-size:14px;display:flex}.img-annot{background:var(--accent);color:#fff;cursor:pointer;border:2px solid #fff;border-radius:999px;justify-content:center;align-items:center;width:22px;height:22px;font-size:11px;font-weight:700;display:flex;position:absolute;transform:translate(-50%,-50%);box-shadow:0 2px 8px #0006}.timeline-h{scroll-snap-type:x mandatory;gap:12px;padding:8px 2px 14px;display:flex;overflow-x:auto}.timeline-h>div{scroll-snap-align:start;flex:0 0 240px}@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-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@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}