.lesson-page{--black:#1d1d1f;--gray:#86868b;--gray-light:#f5f5f7;--white:#fff;--blue:#0071e3;--blue-dark:#0077ed;--gradient-text:linear-gradient(90deg,#7c3aed,#2563eb,#06b6d4);--accent:#7c3aed;--accent-light:#7c3aed14;--green:#059669;--green-light:#10b9810f;--red:#dc2626;--red-light:#dc26260a;--orange:#d97706;--amber:#d97706;--amber-light:#d977060f}.lesson-page svg{fill:none;stroke-linecap:round;stroke-linejoin:round}.lesson-page .page-layout{display:flex}.lesson-page .main-content{flex:1;min-width:0}.lesson-page .course-sidebar{background:var(--gray-light);scrollbar-width:thin;scrollbar-color:#0000001f transparent;scroll-behavior:smooth;border-right:1px solid #0000000f;flex-shrink:0;width:280px;height:calc(100vh - 52px);padding:24px 0;position:sticky;top:52px;overflow-y:auto}.lesson-page .course-sidebar::-webkit-scrollbar{width:4px}.lesson-page .course-sidebar::-webkit-scrollbar-thumb{background:#0000001f;border-radius:4px}.lesson-page .sidebar-header{border-bottom:1px solid #0000000f;margin-bottom:12px;padding:0 20px 20px}.lesson-page .sidebar-header h2{letter-spacing:-.01em;font-size:16px;font-weight:700}.lesson-page .sidebar-header h2 a{color:inherit;text-decoration:none}.lesson-page .sidebar-header p{color:var(--gray);margin-top:4px;font-size:12px}.lesson-page .tree-group{margin-bottom:4px}.lesson-page .tree-level{-webkit-user-select:none;user-select:none;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:600;transition:background .2s;display:flex}.lesson-page .tree-level:hover{background:#00000008}.lesson-page .level-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.lesson-page .level-name{flex:1}.lesson-page .level-link{color:var(--black);min-width:0;text-decoration:none}.lesson-page .level-link:hover,.lesson-page .level-link.active{color:var(--accent)}.lesson-page .tree-toggle{cursor:pointer;background:0 0;border:none;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;transition:background .2s;display:flex}.lesson-page .tree-toggle:hover{background:#0000000d}.lesson-page .chevron{width:16px;height:16px;stroke:var(--gray);stroke-width:2px;flex-shrink:0;transition:transform .3s}.lesson-page .tree-level.open .chevron{transform:rotate(90deg)}.lesson-page .tree-lessons{padding:0 0 8px}.lesson-page .tree-lesson{color:#555;border-left:3px solid #0000;align-items:center;gap:8px;padding:8px 20px 8px 36px;font-size:13px;line-height:1.4;text-decoration:none;transition:all .2s;display:flex}.lesson-page .tree-lesson:hover{color:var(--black);background:#00000008}.lesson-page .tree-lesson.active{color:var(--accent);border-left-color:var(--accent);background:#7c3aed0f;font-weight:600}.lesson-page .tl-num{color:var(--gray);flex-shrink:0;width:24px;font-size:11px;font-weight:700}.lesson-page .sidebar-overlay{display:none}.lesson-page .sidebar-toggle{z-index:999;background:var(--blue);color:#fff;cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:52px;height:52px;transition:transform .2s;display:none;position:fixed;bottom:24px;right:24px;box-shadow:0 4px 24px #0071e34d}.lesson-page .sidebar-toggle:hover{transform:scale(1.05)}.lesson-page .sidebar-toggle svg{stroke:#fff;stroke-width:2px;width:22px;height:22px}@media (max-width:960px){.lesson-page .course-sidebar{z-index:900;width:280px;height:calc(100vh - 52px);display:none;position:fixed;top:52px;left:0;box-shadow:4px 0 24px #0000001a}.lesson-page .course-sidebar.mobile-open{display:block}.lesson-page .sidebar-toggle{display:flex}.lesson-page .sidebar-overlay.active{z-index:899;background:#0000004d;display:block;position:fixed;inset:52px 0 0}}.lesson-page .page-header{background:var(--gray-light);border-bottom:1px solid #0000000a;padding:48px 24px}.lesson-page .page-header-inner{max-width:800px;margin:0 auto}.lesson-page .breadcrumb{color:var(--gray);margin-bottom:28px;font-size:13px}.lesson-page .breadcrumb a{color:var(--blue);text-decoration:none;transition:opacity .2s}.lesson-page .breadcrumb a:hover{opacity:.7}.lesson-page .lesson-badge{background:var(--accent-light);color:var(--accent);border-radius:980px;align-items:center;gap:8px;margin-bottom:20px;padding:6px 16px;font-size:13px;font-weight:600;display:inline-flex}.lesson-page .page-header h1{letter-spacing:-.03em;margin-bottom:20px;font-size:clamp(32px,5vw,48px);font-weight:700;line-height:1.15}.lesson-page .driving-q{color:var(--gray);border-left:3px solid var(--accent);background:var(--accent-light);border-radius:0 12px 12px 0;margin-bottom:16px;padding:16px 20px;font-size:18px;font-style:italic}.lesson-page .takeaway-badge{color:var(--green);background:var(--green-light);border-radius:12px;align-items:flex-start;gap:8px;padding:12px 16px;font-size:15px;display:flex}.lesson-page .takeaway-badge svg{width:18px;height:18px;stroke:var(--green);flex-shrink:0;margin-top:2px}.lesson-page .article{padding:64px 24px 80px}.lesson-page .article-inner{max-width:800px;margin:0 auto}.lesson-page .article-inner h2{letter-spacing:-.02em;margin:56px 0 20px;padding-top:8px;font-size:clamp(24px,3.5vw,32px);font-weight:700;line-height:1.25}.lesson-page .article-inner h2:first-child{margin-top:0}.lesson-page .article-inner h3{letter-spacing:-.01em;margin:32px 0 14px;font-size:20px;font-weight:700}.lesson-page .article-inner h4{letter-spacing:-.01em;color:var(--black);margin:24px 0 12px;font-size:18px;font-weight:700}.lesson-page .article-inner p{color:#333;margin-bottom:16px;font-size:17px;line-height:1.8}.lesson-page .article-inner ul,.lesson-page .article-inner ol{margin:16px 0 20px;padding-left:24px}.lesson-page .article-inner li{color:#333;margin-bottom:8px;font-size:17px;line-height:1.8}.lesson-page .article-inner strong{color:var(--black);font-weight:600}.lesson-page .article-inner em{color:var(--accent)}.lesson-page .experiment-box{background:linear-gradient(135deg,#7c3aed0a,#2563eb0a);border:1px solid #7c3aed1f;border-radius:20px;margin:28px 0;padding:28px 28px 24px;position:relative}.lesson-page .experiment-box:before{content:"🧪";background:var(--white);border-radius:8px;padding:0 6px;font-size:22px;position:absolute;top:-14px;left:20px}.lesson-page .experiment-box h4{color:var(--accent);margin-bottom:12px;padding-top:4px;font-size:16px;font-weight:700}.lesson-page .experiment-box p,.lesson-page .experiment-box li{color:#444;font-size:15px;line-height:1.8}.lesson-page .experiment-box ol{margin:8px 0;padding-left:20px}.lesson-page .game-box{background:linear-gradient(135deg,#2563eb0d,#06b6d40d);border:1px solid #2563eb1f;border-radius:20px;margin:28px 0;padding:24px 26px}.lesson-page .game-box h4{color:var(--blue);margin-bottom:10px;font-size:16px;font-weight:700}.lesson-page .fill-blank{color:#2f2f39;background:#fff;border:1px dashed #0071e338;border-radius:14px;margin:14px 0;padding:16px 18px;font-size:17px;line-height:1.8}.lesson-page .fill-blank .blank{min-width:72px;color:var(--blue);text-align:center;border-bottom:2px solid #0071e359;padding:0 6px;font-weight:700;display:inline-block}.lesson-page .prompt-block{border-left:3px solid var(--accent);color:#333;background:#7c3aed0a;border-radius:0 12px 12px 0;margin:12px 0;padding:14px 90px 14px 16px;font-size:15px;line-height:1.7;position:relative}.lesson-page .copy-btn{color:var(--accent);cursor:pointer;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#fffc;border:1px solid #7c3aed33;border-radius:8px;align-items:center;gap:6px;padding:6px 14px;font-size:12px;font-weight:600;transition:all .2s;display:flex;position:absolute;top:10px;right:10px}.lesson-page .copy-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.lesson-page .copy-btn svg{stroke:currentColor;stroke-width:2px;width:14px;height:14px}.lesson-page .copy-btn.copied{color:#fff;background:#059669;border-color:#059669}.lesson-page .ai-answer-toggle{color:var(--accent);cursor:pointer;background:#7c3aed0a;border:1px solid #7c3aed26;border-radius:10px;align-items:center;gap:6px;margin:12px 0;padding:8px 16px;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex}.lesson-page .ai-answer-toggle:hover{background:#7c3aed1a}.lesson-page .ai-answer-toggle svg{stroke:currentColor;stroke-width:2px;width:16px;height:16px;transition:transform .3s}.lesson-page .ai-answer-toggle.open svg{transform:rotate(180deg)}.lesson-page .ai-answer-content{max-height:0;margin:0;transition:max-height .5s cubic-bezier(.4,0,.2,1);overflow:hidden}.lesson-page .ai-answer-content.open{max-height:2000px}.lesson-page .ai-answer-inner{background:#7c3aed08;border:1px dashed #7c3aed26;border-radius:16px;margin-top:8px;padding:20px}.lesson-page .ai-answer-inner p{color:#555;margin-bottom:10px;font-size:14px;line-height:1.8}.lesson-page .ai-answer-inner .ai-label{color:var(--accent);text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px;font-size:12px;font-weight:700}.lesson-page .annotation{border-bottom:2px solid var(--amber);cursor:help;background:#d977061a;border-radius:2px;padding:0 2px;display:inline;position:relative}.lesson-page .annotation-safe{border-bottom-color:var(--green);background:#05966914}.lesson-page .annotation-legend{border-top:1px dashed #00000014;gap:16px;margin-top:14px;padding-top:10px;display:flex}.lesson-page .annotation-legend span{color:var(--gray);align-items:center;gap:4px;font-size:12px;display:flex}.lesson-page .annotation-legend .dot{border-radius:50%;flex-shrink:0;width:10px;height:10px}.lesson-page .annotation-legend .dot.safe{background:#0596694d}.lesson-page .annotation-legend .dot.caution{background:#d977064d}.lesson-page .article-inner blockquote{border-left:3px solid var(--accent);background:var(--accent-light);color:#444;border-radius:0 12px 12px 0;margin:24px 0;padding:16px 20px;font-size:16px;line-height:1.7}.lesson-page .article-inner blockquote strong{color:var(--accent)}.lesson-page .highlight-box{background:var(--gray-light);border:1px solid #0000000a;border-radius:16px;margin:28px 0;padding:24px 28px}.lesson-page .highlight-box h4{margin-bottom:10px;font-size:16px;font-weight:700}.lesson-page .highlight-box p{color:#444;margin-bottom:0;font-size:15px;line-height:1.8}.lesson-page .highlight-box ul{margin:8px 0 0;padding-left:20px}.lesson-page .highlight-box li{color:#444;margin-bottom:4px;font-size:15px;line-height:1.7}.lesson-page .warning-box,.lesson-page .redline-box{border-radius:16px;margin:28px 0;padding:22px 24px}.lesson-page .warning-box{background:#d977060f;border:1px solid #d9770629}.lesson-page .redline-box{background:#dc26260d;border:1px solid #dc262624}.lesson-page .warning-box h4{color:var(--amber);margin-bottom:10px;font-size:15px;font-weight:700}.lesson-page .redline-box h4{color:var(--red);margin-bottom:10px;font-size:15px;font-weight:700}.lesson-page .warning-box p,.lesson-page .warning-box li,.lesson-page .redline-box p,.lesson-page .redline-box li{color:#4b4b55;font-size:14px;line-height:1.75}.lesson-page .fake-ref{background:#fff;border:1px solid #00000014;border-radius:14px;padding:16px 18px;box-shadow:0 6px 18px #0000000a}.lesson-page .temp-demo{grid-template-columns:1fr 1fr;gap:16px;margin:28px 0;display:grid}.lesson-page .temp-card{border:1px solid #0000000f;border-radius:18px;padding:22px}.lesson-page .temp-card.low{background:linear-gradient(#2563eb0d,#fff 100%);border-color:#2563eb24}.lesson-page .temp-card.high{background:linear-gradient(#f43f5e0d,#fff 100%);border-color:#f43f5e24}.lesson-page .temp-label{letter-spacing:.03em;margin-bottom:10px;font-size:13px;font-weight:700}.lesson-page .temp-card.low .temp-label{color:#2563eb}.lesson-page .temp-card.high .temp-label{color:#e11d48}.lesson-page .temp-card h5{color:var(--black);margin-bottom:8px;font-size:17px;font-weight:700}.lesson-page .temp-card p{color:#555;margin:0;font-size:14px;line-height:1.7}.lesson-page .table-wrap{-webkit-overflow-scrolling:touch;border:1px solid #0000000f;border-radius:16px;margin:28px 0;overflow-x:auto}.lesson-page .table-wrap table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.6}.lesson-page .table-wrap thead{background:var(--gray-light)}.lesson-page .table-wrap th{text-align:left;color:var(--black);white-space:nowrap;border-bottom:1px solid #00000014;padding:14px 20px;font-size:14px;font-weight:600}.lesson-page .table-wrap td{color:#333;vertical-align:top;border-bottom:1px solid #0000000a;padding:14px 20px}.lesson-page .table-wrap tr:last-child td{border-bottom:none}.lesson-page .table-wrap tbody tr{transition:background .2s}.lesson-page .table-wrap tbody tr:hover{background:#7c3aed08}.lesson-page .concept-trio{grid-template-columns:repeat(3,1fr);gap:16px;margin:28px 0;display:grid}.lesson-page .concept-card{text-align:center;border:1px solid #0000000f;border-radius:20px;padding:28px 20px 24px;transition:all .3s;position:relative;overflow:hidden}.lesson-page .concept-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px #00000014}.lesson-page .concept-card .cc-icon{border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;margin:0 auto 16px;font-size:28px;display:flex}.lesson-page .concept-card:first-child .cc-icon{background:#2563eb14}.lesson-page .concept-card:nth-child(2) .cc-icon{background:#7c3aed14}.lesson-page .concept-card:nth-child(3) .cc-icon{background:#05966914}.lesson-page .concept-card .cc-wrong{color:var(--red);justify-content:center;align-items:center;gap:4px;margin-bottom:6px;font-size:14px;font-weight:700;display:flex}.lesson-page .concept-card .cc-title{color:var(--black);margin-bottom:10px;font-size:17px;font-weight:700}.lesson-page .concept-card .cc-desc{color:#555;font-size:14px;line-height:1.7}.lesson-page .concept-card .cc-stripe{height:3px;position:absolute;top:0;left:0;right:0}.lesson-page .concept-card:first-child .cc-stripe{background:linear-gradient(90deg,#2563eb,#60a5fa)}.lesson-page .concept-card:nth-child(2) .cc-stripe{background:linear-gradient(90deg,#7c3aed,#a78bfa)}.lesson-page .concept-card:nth-child(3) .cc-stripe{background:linear-gradient(90deg,#059669,#34d399)}@media (max-width:700px){.lesson-page .concept-trio{grid-template-columns:1fr}}.lesson-page .tab-compare{background:var(--white);border:1px solid #0000000f;border-radius:20px;margin:28px 0;overflow:hidden}.lesson-page .tab-bar{background:var(--gray-light);border-bottom:1px solid #0000000f;display:flex}.lesson-page .tab-btn{text-align:center;cursor:pointer;color:var(--gray);background:0 0;border:none;flex:1;padding:14px 20px;font-size:14px;font-weight:600;transition:all .2s;position:relative}.lesson-page .tab-btn:hover{color:var(--black);background:#00000005}.lesson-page .tab-btn.active{color:var(--accent);background:var(--white)}.lesson-page .tab-btn.active:after{content:"";background:var(--accent);border-radius:3px 3px 0 0;height:3px;position:absolute;bottom:0;left:20%;right:20%}.lesson-page .tab-panels{min-height:200px;position:relative}.lesson-page .tab-panel{padding:28px;display:none}.lesson-page .tab-panel.active{animation:.3s tabFadeIn;display:block}@keyframes tabFadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.lesson-page .compare-row{align-items:flex-start;gap:16px;margin-bottom:14px;display:flex}.lesson-page .compare-label{width:110px;color:var(--gray);flex-shrink:0;padding-top:2px;font-size:13px;font-weight:700}.lesson-page .compare-value{color:#333;flex:1;font-size:15px;line-height:1.7}.lesson-page .tab-panel .tab-icon{margin-bottom:16px;font-size:36px;display:block}.lesson-page .tab-panel .tab-title{color:var(--black);margin-bottom:16px;font-size:18px;font-weight:700}.lesson-page .tab-panel .tab-metaphor{border-left:3px solid var(--accent);color:#555;background:#7c3aed0a;border-radius:12px;margin-top:16px;padding:14px 18px;font-size:15px;line-height:1.7}.lesson-page .skill-section{margin:28px 0}.lesson-page .skill-section-title{align-items:center;gap:10px;margin-bottom:16px;font-size:18px;font-weight:700;display:flex}.lesson-page .skill-section-title .sst-dot{border-radius:50%;width:10px;height:10px}.lesson-page .skill-section-title .sst-dot.good{background:var(--green)}.lesson-page .skill-section-title .sst-dot.bad{background:var(--red)}.lesson-page .skill-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;display:grid}.lesson-page .skill-card{border:1px solid #0000000f;border-radius:14px;padding:18px 20px;transition:all .2s;position:relative;overflow:hidden}.lesson-page .skill-card:hover{transform:translateY(-2px);box-shadow:0 6px 24px #0000000f}.lesson-page .skill-card.good{background:linear-gradient(135deg,#05966908,#10b98105)}.lesson-page .skill-card.good:hover{border-color:#05966933}.lesson-page .skill-card.bad{background:linear-gradient(135deg,#dc262608,#ef444405)}.lesson-page .skill-card.bad:hover{border-color:#dc262626}.lesson-page .skill-card .sc-icon{margin-bottom:8px;font-size:24px;display:block}.lesson-page .skill-card .sc-name{color:var(--black);margin-bottom:6px;font-size:15px;font-weight:700}.lesson-page .skill-card .sc-example{color:#666;font-size:13px;line-height:1.6}.lesson-page .skill-card .sc-tag{border-radius:6px;padding:2px 8px;font-size:11px;font-weight:700;position:absolute;top:12px;right:12px}.lesson-page .skill-card.good .sc-tag{color:var(--green);background:#05966914}.lesson-page .skill-card.bad .sc-tag{color:var(--red);background:#dc26260f}.lesson-page .myth-grid{grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:16px;margin:20px 0;display:grid}.lesson-page .myth-card{cursor:default;border:1px solid #0000000f;border-radius:16px;transition:all .3s;overflow:hidden}.lesson-page .myth-card:hover{transform:translateY(-2px);box-shadow:0 8px 32px #00000014}.lesson-page .myth-top{background:#dc26260a;border-bottom:1px solid #dc262614;align-items:center;gap:12px;padding:16px 20px;display:flex}.lesson-page .myth-top .mt-x{width:28px;height:28px;color:var(--red);background:#dc26261a;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:14px;font-weight:800;display:flex}.lesson-page .myth-top .mt-text{color:var(--red);font-size:15px;font-weight:600}.lesson-page .myth-bottom{background:#05966908;align-items:center;gap:12px;padding:16px 20px;display:flex}.lesson-page .myth-bottom .mt-check{background:#0596691a;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;display:flex}.lesson-page .myth-bottom .mt-check svg{width:16px;height:16px;stroke:var(--green);stroke-width:2.5px}.lesson-page .myth-bottom .mt-text{color:#333;font-size:15px;line-height:1.6}.lesson-page .summary-card{background:linear-gradient(145deg,#f0f4ff,#e8ecff);border:1px solid #7c3aed1a;border-radius:20px;margin:56px 0 32px;padding:32px}.lesson-page .summary-card h2{margin-top:0!important;margin-bottom:20px!important;padding-top:0!important;font-size:24px!important}.lesson-page .takeaway-quote{background:var(--green-light);border:1px solid #10b98126;border-radius:16px;align-items:flex-start;gap:14px;margin:28px 0;padding:24px 28px;display:flex}.lesson-page .takeaway-quote svg{width:24px;height:24px;stroke:var(--green);flex-shrink:0;margin-top:2px}.lesson-page .takeaway-quote .tq-content{flex:1}.lesson-page .takeaway-quote .tq-label{color:var(--green);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px;font-size:13px;font-weight:700}.lesson-page .takeaway-quote .tq-text{color:#065f46;font-size:17px;font-weight:600;line-height:1.6}.lesson-page .takeaway-quiz{background:var(--green-light);border:1px solid #10b98126;border-radius:16px;margin:28px 0;padding:24px 28px}.lesson-page .takeaway-quiz .tq-label{color:var(--green);text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px;font-size:13px;font-weight:700}.lesson-page .takeaway-quiz .tq-question{color:var(--black);margin-bottom:16px;font-size:17px;font-weight:600;line-height:1.5}.lesson-page .tq-options{flex-direction:column;gap:8px;display:flex}.lesson-page .tq-option{cursor:pointer;background:var(--white);border:1px solid #00000014;border-radius:12px;padding:14px 18px;font-size:15px;line-height:1.6;transition:all .2s}.lesson-page .tq-option:hover{border-color:var(--green);background:#10b9810a}.lesson-page .tq-option.correct{border-color:var(--green);background:#10b98114}.lesson-page .tq-option.wrong{border-color:var(--red);background:#dc26260a}.lesson-page .tq-feedback{border-radius:12px;margin-top:12px;padding:14px 18px;font-size:14px;line-height:1.7}.lesson-page .principle-box{text-align:center;background:linear-gradient(135deg,#7c3aed0f,#2563eb0a);border:1px solid #7c3aed1f;border-radius:20px;margin:28px 0;padding:28px}.lesson-page .principle-box .pb-icon{margin-bottom:12px;font-size:40px}.lesson-page .principle-box .pb-title{color:var(--black);letter-spacing:-.02em;margin-bottom:10px;font-size:22px;font-weight:800}.lesson-page .principle-box .pb-desc{color:#444;max-width:560px;margin:0 auto;font-size:16px;line-height:1.8}.lesson-page .article-img{cursor:zoom-in;border:1px solid #0000000f;border-radius:16px;margin:28px 0;transition:all .3s;overflow:hidden}.lesson-page .article-img:hover{transform:translateY(-2px);box-shadow:0 8px 32px #0000001a}.lesson-page .article-img img{width:100%;display:block}.lesson-page .article-img-caption{color:var(--gray);text-align:center;background:var(--gray-light);border-top:1px solid #0000000a;padding:10px 16px;font-size:13px}.lesson-page .lightbox{z-index:2000;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);cursor:zoom-out;background:#000000d9;justify-content:center;align-items:center;padding:24px;animation:.25s lbFadeIn;display:none;position:fixed;inset:0}.lesson-page .lightbox.active{display:flex}.lesson-page .lightbox img{object-fit:contain;border-radius:12px;max-width:95%;max-height:90vh;box-shadow:0 24px 80px #0006}.lesson-page .lightbox-close{cursor:pointer;background:#ffffff26;border:none;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;transition:background .2s;display:flex;position:absolute;top:20px;right:24px}.lesson-page .lightbox-close:hover{background:#ffffff4d}.lesson-page .lightbox-close svg{stroke:#fff;stroke-width:2px;width:20px;height:20px}@keyframes lbFadeIn{0%{opacity:0}to{opacity:1}}.lesson-page .lesson-nav{border-top:1px solid #00000014;justify-content:space-between;align-items:center;margin-top:56px;padding-top:28px;display:flex}.lesson-page .lesson-nav a{color:var(--blue);border-radius:12px;align-items:center;gap:8px;padding:12px 20px;font-size:15px;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.lesson-page .lesson-nav a:hover{background:#0071e30f;gap:12px}.lesson-page .lesson-nav .ln-placeholder{width:1px}.lesson-page .caution-box{background:#d977060f;border:1px solid #d9770626;border-radius:16px;margin:28px 0;padding:20px 24px}.lesson-page .caution-box h4{color:var(--amber);margin-bottom:8px;font-size:15px;font-weight:700}.lesson-page .caution-box p,.lesson-page .caution-box li{color:#555;font-size:14px;line-height:1.7}.lesson-page .step-cards{gap:16px;margin:28px 0;display:grid}.lesson-page .step-card{border:1px solid #0000000f;border-radius:16px;gap:16px;padding:24px;transition:all .3s;display:flex}.lesson-page .step-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px #0000000f}.lesson-page .step-card .step-num{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:15px;font-weight:800;display:flex}.lesson-page .step-card .step-content h4{margin-bottom:6px;font-size:16px;font-weight:700}.lesson-page .step-card .step-content p{color:#555;margin:0;font-size:14px;line-height:1.7}.lesson-page .flow-diagram{text-align:center;margin:28px 0}.lesson-page .flow-steps{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;display:flex}.lesson-page .flow-step{white-space:nowrap;border-radius:12px;padding:12px 20px;font-size:14px;font-weight:600}.lesson-page .flow-arrow{color:var(--gray);font-size:18px}.lesson-page .fade-in{opacity:0;transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1);transform:translateY(30px)}.lesson-page .fade-in.visible{opacity:1;transform:translateY(0)}.lesson-page .fade-in-d1{transition-delay:.1s}.lesson-page .fade-in-d2{transition-delay:.2s}.lesson-page .fade-in-d3{transition-delay:.3s}.lesson-page .info-table{border-collapse:separate;border-spacing:0;border:1px solid #00000014;border-radius:16px;width:100%;margin:24px 0;font-size:15px;overflow:hidden}.lesson-page .info-table thead{background:var(--gray-light)}.lesson-page .info-table th{text-align:left;color:var(--gray);letter-spacing:.02em;border-bottom:1px solid #0000000f;padding:14px 18px;font-size:14px;font-weight:600}.lesson-page .info-table td{vertical-align:top;border-bottom:1px solid #0000000a;padding:14px 18px;line-height:1.6}.lesson-page .info-table tbody tr:last-child td{border-bottom:none}.lesson-page .info-table tbody tr{transition:background .2s}.lesson-page .info-table tbody tr:hover{background:#7c3aed08}.lesson-page .flow-box{background:var(--black);color:#fff;white-space:pre-wrap;border-radius:16px;margin:24px 0;padding:24px 28px;font-family:SF Mono,SFMono-Regular,Menlo,monospace;font-size:14px;line-height:1.9;overflow-x:auto}.lesson-page .flow-box .comment{color:#6b7280}.lesson-page .flow-box .highlight{color:#818cf8}.lesson-page .flow-box .arrow{color:#06b6d4}.lesson-page .comparison-grid{grid-template-columns:1fr 1fr;gap:20px;margin:24px 0;display:grid}.lesson-page .comparison-card{border:1px solid #00000014;border-radius:16px;padding:24px}.lesson-page .comparison-card.old{background:#fef2f2;border-color:#dc26261f}.lesson-page .comparison-card.new{background:#10b9810a;border-color:#10b98126}.lesson-page .comparison-card.before{background:#fef2f2;border-color:#dc26261f}.lesson-page .comparison-card.after{background:#10b9810a;border-color:#10b98126}.lesson-page .comparison-card h4{align-items:center;gap:8px;margin-bottom:12px;font-size:15px;font-weight:700;display:flex}.lesson-page .comparison-card.old h4{color:var(--red)}.lesson-page .comparison-card.new h4{color:var(--green)}.lesson-page .comparison-card.before h4{color:var(--red)}.lesson-page .comparison-card.after h4{color:var(--green)}.lesson-page .comparison-card p,.lesson-page .comparison-card ul{color:#555;font-size:15px;line-height:1.7}.lesson-page .comparison-card ul{margin:0;padding-left:18px}.lesson-page .comparison-card li{margin-bottom:6px}@media (max-width:600px){.lesson-page .comparison-grid{grid-template-columns:1fr}}.lesson-page .risk-low{color:var(--green);font-weight:700}.lesson-page .risk-mid{color:var(--orange);font-weight:700}.lesson-page .risk-high{color:var(--red);font-weight:700}.lesson-page .memory-box{background:linear-gradient(135deg,#7c3aed0a,#2563eb08);border:1px solid #7c3aed1f;border-radius:16px;margin:28px 0;padding:22px 24px}.lesson-page .memory-box h4{color:var(--accent);margin-bottom:12px;font-size:15px;font-weight:700}.lesson-page .memory-items{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.lesson-page .memory-item{background:#fff;border:1px solid #0000000f;border-radius:12px;padding:14px 16px}.lesson-page .memory-item .label{color:var(--gray);margin-bottom:6px;font-size:12px}.lesson-page .memory-item .value{font-size:15px;font-weight:700}.lesson-page .level-next{background:linear-gradient(135deg,#1d4ed8,#7c3aed);border-radius:20px;margin-top:28px;padding:28px;box-shadow:0 16px 36px #2563eb2e}.lesson-page .level-next a{color:#1d4ed8;background:#fff;border-radius:999px;align-items:center;gap:8px;padding:12px 18px;font-size:14px;font-weight:700;text-decoration:none;transition:transform .2s,box-shadow .2s;display:inline-flex}.lesson-page .level-next a:hover{transform:translateY(-1px);box-shadow:0 8px 20px #0000001f}.lesson-page .article-inner code{background:#0000000d;border-radius:4px;padding:2px 6px;font-family:SF Mono,SFMono-Regular,Menlo,monospace;font-size:14px}@media (max-width:600px){.lesson-page .page-header{padding:36px 16px}.lesson-page .article{padding:40px 16px 60px}.lesson-page .experiment-box{padding:20px}.lesson-page .prompt-block{padding-right:16px}.lesson-page .copy-btn{margin-top:10px;position:static}.lesson-page .summary-card{padding:20px}.lesson-page .lesson-nav{flex-direction:column;gap:12px}.lesson-page .lesson-nav a{justify-content:center;width:100%}.lesson-page .myth-grid,.lesson-page .skill-grid{grid-template-columns:1fr}.lesson-page .tab-bar{flex-wrap:wrap}.lesson-page .tab-btn{padding:10px 12px;font-size:13px}.lesson-page .concept-trio,.lesson-page .temp-demo,.lesson-page .memory-items{grid-template-columns:1fr}}
