.lesson-spotlight{z-index:60;border:2px solid var(--accent);pointer-events:none;border-radius:10px;transition:left .25s,top .25s,width .25s,height .25s;animation:1.8s ease-in-out infinite lesson-pulse;position:fixed;box-shadow:0 0 0 2px #ff8c4259,0 0 22px #ff8c4273}@keyframes lesson-pulse{0%,to{box-shadow:0 0 0 2px #ff8c424d,0 0 16px #ff8c4259}50%{box-shadow:0 0 0 3px #ff8c4280,0 0 26px #ff8c4299}}.lesson-card{z-index:61;background:var(--panel-solid);border:1px solid var(--line-strong);border-radius:var(--radius);width:min(560px,100vw - 32px);max-height:70vh;box-shadow:var(--shadow);flex-direction:column;gap:12px;padding:18px 20px;display:flex;position:fixed;bottom:22px;left:50%;overflow-y:auto;transform:translate(-50%)}.lesson-card:focus{outline:none}.lesson-card-head{justify-content:space-between;align-items:center;display:flex}.lesson-kicker{font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-size:11px}.lesson-close{color:var(--text-dim);background:0 0;border:none;padding:4px;font-size:16px;line-height:1}.lesson-close:hover{color:var(--text)}.lesson-title{margin:0;font-size:19px}.lesson-body{color:var(--text);font-size:14px;line-height:1.6}.lesson-body p{margin:0 0 8px}.lesson-body .eq-flow{font-family:var(--mono);color:var(--altitude);background:var(--navy-900);border:1px solid var(--line);border-radius:var(--radius-sm);margin:8px 0;padding:8px 10px;font-size:13px;display:block;overflow-x:auto}.lesson-body .tex-eq{margin:8px 0}.lesson-body .caveat{border-left:2px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-dim);background:#ff8c4212;padding:8px 10px}.lesson-body strong{color:var(--text)}.lesson-widget{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--navy-900);padding:8px}.lesson-progress{flex-wrap:wrap;gap:6px;display:flex}.lesson-dot{border:1px solid var(--line-strong);background:0 0;border-radius:50%;width:9px;height:9px;padding:0;transition:background .15s}.lesson-dot:hover{background:var(--altitude-dim)}.lesson-dot.is-active{background:var(--accent);border-color:var(--accent)}.lesson-nav{justify-content:space-between;gap:10px;display:flex}.lesson-btn{border-radius:var(--radius-sm);border:1px solid var(--line-strong);padding:9px 18px;font-size:14px;font-weight:600}.lesson-btn.ghost{color:var(--text);background:0 0}.lesson-btn.ghost:disabled{opacity:.4;cursor:not-allowed}.lesson-btn.primary{background:var(--accent);border-color:var(--accent);color:#1a0e04}.lesson-btn.primary:hover{background:var(--accent-strong)}@media (max-width:760px){.lesson-card{border-radius:var(--radius) var(--radius) 0 0;max-height:60vh;bottom:0}}