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h1{font-family:var(--font-display);margin:0;font-size:clamp(2.6rem,6vw,5rem);font-weight:400;line-height:1.02}.lesson-article h2{font-family:var(--font-display);margin-top:42px;font-size:2.1rem;font-weight:400}.lesson-article p,.lesson-article li{color:var(--gl-earth-mid);font-size:1.05rem;line-height:1.78}.lesson-article blockquote{border-left:3px solid var(--gl-sun);background:var(--gl-paper-warm);border-radius:4px;margin:28px 0;padding:14px 18px}.lesson-equation{vertical-align:middle;max-width:100%;padding:3px 0 5px;display:inline-block;overflow:auto hidden}.lesson-equation .katex{color:var(--gl-earth);font-size:1.05em}.lesson-article blockquote .lesson-equation{margin:8px 0;display:block}.lesson-plain-title{color:var(--gl-grass-shadow);font-size:1.35rem;font-style:italic}.lesson-paywall{background:var(--gl-cream);border:1px solid 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var(--gl-sun));height:100%;display:block}.deck-scene{box-shadow:0 12px 32px var(--gl-shadow);background:linear-gradient(#d6e7f3 0%,#edf0d8 54%,#f1ecdb 100%);border:1px solid #6b8e3d4d;border-radius:16px;position:relative;overflow:hidden}.deck-scene svg{width:100%;height:auto;display:block}.deck-scene-label{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--gl-earth-mid);background:#fffcf0b3;border-radius:999px;padding:4px 10px;font-size:.64rem;position:absolute;bottom:12px;left:14px}.deck-viewport{min-height:320px;position:relative}.deck-card{background:var(--gl-cream);box-shadow:0 1px 0 var(--gl-shadow);cursor:grab;touch-action:pan-y;border:1px solid #6b8e3d47;border-radius:16px;padding:28px 30px}.deck-card:active{cursor:grabbing}.deck-card-finish{background:#f4b83a14;border-color:#f4b83a80}.deck-card-title{font-family:var(--font-display);color:var(--gl-earth);margin:0 0 14px;font-size:1.7rem;font-weight:500}.deck-card-body{color:var(--gl-earth-mid)}.deck-card-body p,.deck-card-body li{color:var(--gl-earth-mid);font-size:1.04rem;line-height:1.72}.deck-card-body p{margin:0 0 14px}.deck-card-body p:last-child{margin-bottom:0}.deck-card-body ol,.deck-card-body ul{gap:8px;margin:0;padding-left:20px;display:grid}.deck-card-body a{color:var(--gl-grass-shadow);font-weight:500;-webkit-text-decoration:underline #3f5d1f59;text-decoration:underline #3f5d1f59}.deck-card-body blockquote{border-left:3px solid var(--gl-sun);background:var(--gl-paper-warm);border-radius:4px;margin:18px 0;padding:14px 18px}.deck-card-body blockquote p{margin:0 0 6px}.deck-card-body .lab-handoff{margin:18px 0 0}.deck-controls{justify-content:space-between;align-items:center;gap:12px;display:flex}.deck-controls .qp-button:disabled{opacity:.4;cursor:not-allowed;transform:none}.deck-footer{color:var(--gl-earth-soft);justify-content:space-between;align-items:center;gap:12px;font-size:.85rem;display:flex}.deck-footer a:hover{color:var(--gl-grass-shadow)}.hud{background:var(--gl-cream);box-shadow:0 1px 0 var(--gl-shadow);border:1px solid #6b8e3d47;border-radius:14px;gap:14px;padding:16px;display:grid}.hud-divider{background:#6b8e3d2e;height:1px;margin:0 -4px}.hud-row{align-items:center;gap:12px;display:flex}.hud-stat{font-family:var(--font-mono);color:var(--gl-grass-shadow);align-items:center;gap:6px;font-size:.78rem;font-weight:600;display:inline-flex}.hud-stat:nth-child(2){color:var(--gl-sun-deep)}.hud-sound{width:30px;height:30px;color:var(--gl-earth-mid);cursor:pointer;background:0 0;border:1px solid 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