.deep-lesson{max-width:1180px;margin:auto;padding:35px 28px 90px}.deep-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px}.deep-lesson h1{font-size:clamp(34px,5vw,54px);letter-spacing:-2px;margin:12px 0}.lesson-lead{color:#b9c7d8;line-height:1.65;font-size:17px;max-width:760px}.objective-row{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}.objective-row span{padding:7px 9px;background:#17273c;border-radius:6px;color:#9cb1c8;font:11px 'DM Mono'}.visual-explainer{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:22px 14px;margin:28px 0;border:1px solid #72e6d34c;border-radius:15px;background:radial-gradient(circle at 50%,#1d4b52,#0c1b2e 70%);overflow:hidden}.visual-step{z-index:1;padding:15px 10px;min-height:88px;border:1px solid #ffffff1a;border-radius:9px;background:#0d2636d9}.visual-step b{display:block;color:#71e6d3;font:11px 'DM Mono';margin-bottom:9px}.visual-step span{font-size:12px;font-weight:700}.visual-beam{position:absolute;left:7%;right:7%;height:2px;top:50%;background:#71e6d3;box-shadow:0 0 12px #71e6d3;animation:beam 2.8s ease-in-out infinite}.deep-section{margin:35px 0}.concept-list{display:grid;gap:10px;margin-top:13px}.concept-list article{display:flex;gap:14px;padding:17px;border:1px solid var(--line);border-radius:11px;background:#0c192b}.concept-list article>span{color:#71e6d3;font:13px 'DM Mono'}.concept-list h3{margin:0 0 5px;font-size:15px}.concept-list p{margin:0;color:#aebed0;line-height:1.6}.analogy{padding:22px;border-left:3px solid #b8a6ff;border-radius:0 11px 11px 0;background:#1e1b3a}.analogy span,.warning span,.takeaway span{color:#c9b9ff;font:11px 'DM Mono';letter-spacing:1px}.analogy p{font-size:17px;line-height:1.55;margin:8px 0 0}.task-panel{margin:30px 0;padding:22px;border:1px solid #ffbb7082;border-radius:14px;background:linear-gradient(130deg,#342619,#15243b)}.task-panel h2{font-size:18px;margin:8px 0}.task-panel p{color:#b9c5d1;font-size:13px}.task-panel textarea{box-sizing:border-box;width:100%;min-height:92px;margin:8px 0;background:#081524;border:1px solid #4a596c;border-radius:8px;padding:11px;color:white;font:12px 'DM Mono'}.task-actions{display:flex;align-items:center;justify-content:space-between;gap:15px}.task-actions span{font-size:12px;color:#7ee8d8}.deep-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.deep-grid article{padding:18px;border-radius:11px}.warning{background:#321e2b;border:1px solid #ff788044}.takeaway{background:#133b39;border:1px solid #72e6d348}.warning p,.takeaway p{margin:8px 0 0;line-height:1.55;font-size:13px}.warning span{color:#ffadb4}.takeaway span{color:#7ee8d8}.next-challenge{margin-top:30px;padding:20px;border:1px solid var(--line);border-radius:13px;background:#0d1c30;display:flex;align-items:center;justify-content:space-between;gap:16px}.next-challenge h2{margin:6px 0;font-size:19px}.next-challenge p{color:var(--muted);margin:0;font-size:12px}.deep-side{height:max-content;position:sticky;top:20px;padding:16px;border:1px solid var(--line);border-radius:13px;background:#0c192a}.deep-side b{display:block;color:#8c9bb0;font:10px 'DM Mono';letter-spacing:1px;margin:5px 0 9px}.deep-side a,.deep-side button{display:block;width:100%;padding:8px 0;background:none;text-align:left;color:#b7c5d6;font-size:11px}.deep-side button.active{color:#71e6d3}.deep-side hr{border:0;border-top:1px solid var(--line);margin:12px 0}@keyframes beam{0%,100%{opacity:.3;transform:scaleX(.35)}50%{opacity:1;transform:scaleX(1)}}@media(max-width:850px){.deep-layout{grid-template-columns:1fr}.deep-side{display:none}}@media(max-width:600px){.deep-lesson{padding:30px 18px 60px}.visual-explainer{grid-template-columns:1fr 1fr}.visual-step{min-height:72px}.visual-beam{display:none}.deep-grid{grid-template-columns:1fr}.next-challenge{align-items:flex-start;flex-direction:column}.task-actions{align-items:flex-start;flex-direction:column}}