@keyframes _si{from{opacity:0}to{opacity:1}}

.legacy-content .lesson-header .kicker {color:var(--al)}.legacy-content .l-callout b {color:var(--al)}.legacy-content .btn-al {background:var(--al);color:#fff;border:none;padding:10px 24px;border-radius:999px;font-size:14px;font-weight:800;cursor:pointer;font-family:inherit;transition:filter .15s,transform .15s}.legacy-content .btn-al:hover:not(:disabled) {filter:brightness(1.08);transform:translateY(-1px)}.legacy-content .btn-al:disabled {background:#c4c8cf;cursor:not-allowed}.legacy-content .btn-ghost {background:var(--card);color:var(--sub);border:1.5px solid var(--border);padding:9px 20px;border-radius:999px;font-size:13px;font-weight:700;cursor:pointer;font-family:inherit;transition:border-color .15s,color .15s}.legacy-content .btn-ghost:hover {border-color:var(--al-line);color:var(--al)}.legacy-content .guess-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:20px 24px}.legacy-content .guess-strip {display:grid;grid-template-columns:repeat(20,1fr);gap:4px;margin-bottom:16px}.legacy-content .g-cell {aspect-ratio:1;border-radius:5px;background:rgba(219,39,119,.1);display:flex;align-items:center;justify-content:center;font-size:9.5px;font-weight:700;color:var(--al-deep);cursor:pointer;transition:background .2s,opacity .3s,transform .15s;-webkit-user-select:none;user-select:none;font-variant-numeric:tabular-nums}.legacy-content .g-cell:hover {transform:scale(1.15);background:rgba(219,39,119,.25)}.legacy-content .g-cell.dead {background:rgba(0,0,0,.05);color:#c4c8cf;opacity:.5;cursor:default}.legacy-content .g-cell.dead:hover {transform:none}.legacy-content .g-cell.tried {box-shadow:0 0 0 2px var(--amber) inset}.legacy-content .g-cell.hit {background:var(--success);color:#fff;transform:scale(1.2);box-shadow:0 0 0 3px rgba(22,163,74,.35)}.legacy-content .g-cell.hit:hover {transform:scale(1.2)}.legacy-content .g-cell.probing {background:var(--al);color:#fff;transform:scale(1.2)}.legacy-content .guess-status {display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:14px}.legacy-content .guess-msg {flex:1;min-width:200px;font-size:14px;font-weight:700;color:var(--text)}.legacy-content .guess-msg b {color:var(--al)}.legacy-content .guess-count {font-size:12.5px;font-weight:700;color:var(--sub);flex-shrink:0}.legacy-content .guess-count b {font-size:22px;font-weight:900;color:var(--text);font-variant-numeric:tabular-nums;margin-right:2px}.legacy-content .guess-controls {display:flex;gap:10px;flex-wrap:wrap;align-items:center}.legacy-content .guess-verdict {margin-top:14px;padding:14px 18px;background:var(--al-soft);border:1.5px dashed var(--al-line);border-radius:var(--radius-sm);font-size:13.5px;line-height:1.8;color:var(--sub);display:none}.legacy-content .guess-verdict.show {display:block}.legacy-content .guess-verdict b {color:var(--al-deep)}.legacy-content .log-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:20px 24px}.legacy-content .log-btns {display:flex;gap:9px;flex-wrap:wrap;margin-bottom:18px}.legacy-content .log-btn {border:1.5px solid var(--border);background:var(--card);border-radius:999px;padding:8px 20px;font-size:13.5px;font-weight:800;color:var(--text);cursor:pointer;font-family:inherit;transition:all .15s}.legacy-content .log-btn:hover {border-color:var(--al-line)}.legacy-content .log-btn.active {background:var(--al);border-color:var(--al);color:#fff}.legacy-content .log-display {display:flex;align-items:baseline;gap:10px;margin-bottom:16px;flex-wrap:wrap}.legacy-content .log-display .ld-text {font-size:14px;color:var(--sub);font-weight:700}.legacy-content .log-display .ld-num {font-size:38px;font-weight:900;color:var(--al);font-variant-numeric:tabular-nums;line-height:1}.legacy-content .fold-track {position:relative;height:34px;background:rgba(0,0,0,.05);border-radius:8px;overflow:hidden;margin-bottom:8px}.legacy-content .fold-fill {position:absolute;left:0;top:0;bottom:0;background:linear-gradient(90deg,var(--al),#f472b6);border-radius:8px;transition:width .22s cubic-bezier(.25,1,.5,1);display:flex;align-items:center;justify-content:flex-end;padding-right:10px;min-width:3px}.legacy-content .fold-fill span {font-size:11px;font-weight:800;color:#fff;white-space:nowrap}.legacy-content .fold-caption {font-size:12.5px;color:var(--sub);font-weight:700;min-height:20px;font-variant-numeric:tabular-nums}.legacy-content .fold-caption b {color:var(--al-deep)}.legacy-content .premise-card {background:linear-gradient(135deg,#fffbeb,#fef3c7);border:1.5px solid #fde68a;border-radius:var(--radius);padding:20px 24px;margin-top:24px}.legacy-content .premise-card h4 {font-size:15px;font-weight:800;color:#92400e;margin-bottom:8px}.legacy-content .premise-card p {font-size:13.5px;color:#78350f;line-height:1.85}.legacy-content .premise-card p b {color:#b45309}.legacy-content .irl-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.legacy-content .irl-card {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:16px 18px}.legacy-content .irl-card .irl-icon {font-size:24px;margin-bottom:8px}.legacy-content .irl-card h4 {font-size:14px;font-weight:800;color:var(--text);margin-bottom:5px}.legacy-content .irl-card p {font-size:12.5px;color:var(--sub);line-height:1.7}.legacy-content .takeaway-box {background:linear-gradient(135deg,#fdf2f8,#fce7f3);border:1.5px solid #fbcfe8;border-radius:var(--radius);padding:24px 28px;margin-top:36px}.legacy-content .takeaway-box h3 {font-size:17px;font-weight:800;color:#9d174d;margin-bottom:10px}.legacy-content .takeaway-box ul {list-style:none;padding:0;margin:0}.legacy-content .takeaway-box li {font-size:14.5px;color:#831843;line-height:1.8;padding:4px 0 4px 22px;position:relative}.legacy-content .takeaway-box li::before {content:'';position:absolute;left:0;top:13px;width:8px;height:8px;border-radius:50%;background:#db2777}@media (max-width:768px){.legacy-content .guess-strip {grid-template-columns:repeat(10,1fr)}.legacy-content .g-cell {font-size:10px}.legacy-content .irl-grid {grid-template-columns:1fr}.legacy-content .log-display .ld-num {font-size:30px}}

.legacy-content .xa-tldr {margin:18px 0 4px;padding:14px 18px;background:rgba(0,102,255,0.04);border:1px solid rgba(0,102,255,0.16);border-radius:10px}.legacy-content .xa-tldr .xa-tldr-tag {display:block;font-size:11px;font-weight:800;letter-spacing:1px;color:var(--accent,#0066ff);margin-bottom:6px}.legacy-content .xa-tldr p {margin:0;font-size:15px;line-height:1.8;color:var(--text,#1f2937)}