:root{--bg-primary:#fff;--bg-subtle:#f8fafc;--bg-card:#fff;--bg-elevated:#f1f5f9;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--text-faint:#94a3b8;--border-light:#e2e8f0;--border-subtle:#cbd5e1;--border-focus:#0186cc;--accent-primary:#0186cc;--accent-hover:#026aa3;--accent-light:#f0f9ff;--accent-border:#bae6fd;--accent-ring:#0186cc33;--status-stable-bg:#f0fdf4;--status-stable-text:#166534;--status-stable-border:#bbf7d0;--status-warn-bg:#fffbeb;--status-warn-text:#92400e;--status-warn-border:#fde68a;--status-danger-bg:#fef2f2;--status-danger-text:#991b1b;--status-danger-border:#fecaca;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--max-width:1200px;--article-width:820px;--header-height:64px;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -2px #0000000d;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -4px #0000000a}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-sans);color:var(--text-primary);background-color:var(--bg-subtle);scroll-behavior:smooth;-webkit-font-smoothing:antialiased;font-size:16px;line-height:1.6}body{flex-direction:column;min-height:100vh;display:flex}.skip-to-content{z-index:9999;background:var(--accent-primary);color:#fff;border-radius:0 0 var(--radius-md) var(--radius-md);padding:.75rem 1.5rem;font-size:.9rem;font-weight:700;text-decoration:none;transition:top .2s;position:absolute;top:-100%;left:50%;transform:translate(-50%)}.skip-to-content:focus{outline:none;top:0}.site-header{z-index:100;height:var(--header-height);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border-light);background-color:#fffffff2;align-items:center;display:flex;position:sticky;top:0}.header-container{width:100%;max-width:var(--max-width);align-items:center;gap:1.75rem;margin:0 auto;padding:0 1.5rem;display:flex}.brand-link{color:var(--text-primary);letter-spacing:-.03em;flex:none;align-items:center;gap:.4rem;font-size:1.35rem;font-weight:800;text-decoration:none;display:flex}.brand-logo-img{object-fit:contain;flex:none;width:auto;height:62px}.brand-link-footer .brand-logo-img{width:auto;height:68px}.brand-name{font-family:"Sora", var(--font-sans);white-space:nowrap}.brand-name-accent{color:var(--accent-primary)}.header-nav{flex:auto;align-items:center;gap:1rem;min-width:0;display:flex}.nav-link{color:var(--text-secondary);white-space:nowrap;font-size:.925rem;font-weight:500;text-decoration:none;transition:color .15s}.nav-link:hover,.nav-link.active{color:var(--accent-primary)}.nav-toggle{border:1px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-primary);width:42px;height:42px;color:var(--text-primary);cursor:pointer;justify-content:center;align-items:center;font-size:1.05rem;transition:all .15s;display:none}.nav-toggle:hover{border-color:var(--accent-border);color:var(--accent-primary)}.header-container .nav-dashboard{flex:none;align-items:center;display:inline-flex}.nav-dashboard-icon{background:linear-gradient(180deg, #fff, var(--bg-subtle));width:37px;height:37px;color:var(--text-secondary);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:1.12rem;transition:color .18s,transform .18s;display:inline-flex;position:relative}.nav-dashboard-icon:before{content:"";background:conic-gradient(var(--accent-primary) calc(var(--progress,0) * 1%), var(--border-subtle) 0);border-radius:50%;transition:background .3s;position:absolute;top:0;bottom:0;left:0;right:0;-webkit-mask:radial-gradient(farthest-side,#0000 calc(100% - 3px),#000 calc(100% - 3px));mask:radial-gradient(farthest-side,#0000 calc(100% - 3px),#000 calc(100% - 3px))}.nav-dashboard-icon:after{content:"";z-index:2;background:#16a34a;border:2px solid #fff;border-radius:50%;width:10px;height:10px;position:absolute;bottom:0;right:0}.nav-dashboard-icon i{z-index:1;position:relative}.nav-dashboard:hover .nav-dashboard-icon{color:var(--accent-primary);transform:translateY(-1px)}.nav-dashboard.active .nav-dashboard-icon{color:var(--accent-primary)}.nav-item{position:relative}.nav-parent{align-items:center;display:inline-flex}.nav-caret{color:var(--text-faint);margin-left:.3rem;font-size:.62rem;transition:transform .15s}.nav-item:before{content:"";height:12px;position:absolute;top:100%;left:-12px;right:-12px}.nav-dropdown{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);min-width:264px;max-width:330px;max-height:min(70vh,480px);box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;z-index:120;padding:.5rem;transition:opacity .18s,transform .18s,visibility .18s;position:absolute;top:calc(100% + 8px);left:50%;overflow-y:auto;transform:translate(-50%,6px)}.nav-item:hover .nav-dropdown,.nav-item:focus-within .nav-dropdown{opacity:1;visibility:visible;transform:translate(-50%)}.nav-item:hover .nav-caret{transform:rotate(180deg)}.nav-dropdown-wide{grid-template-columns:1fr 1fr;align-content:start;gap:.15rem;min-width:500px;max-width:580px;display:grid}.nav-drop-link{border-radius:var(--radius-md);color:var(--text-secondary);justify-content:space-between;align-items:center;gap:1rem;padding:.6rem .8rem;font-size:.88rem;font-weight:500;line-height:1.4;text-decoration:none;transition:background .12s,color .12s;display:flex}.nav-drop-link:hover{background:var(--accent-light);color:var(--accent-primary)}.nav-drop-count{color:var(--text-faint);background:var(--bg-subtle);border-radius:999px;flex:none;padding:.12rem .55rem;font-size:.72rem;font-weight:700}.nav-drop-link:hover .nav-drop-count{color:var(--accent-primary)}@media (max-width:1024px){.nav-toggle{display:inline-flex}.header-nav{top:var(--header-height);background:var(--bg-primary);border-bottom:1px solid var(--border-light);box-shadow:var(--shadow-lg);z-index:90;flex-direction:column;align-items:stretch;gap:0;padding:.5rem 1rem 1rem;display:none;position:absolute;left:0;right:0}.header-nav.open{max-height:calc(100vh - var(--header-height) - 8px);max-height:calc(100dvh - var(--header-height) - 8px);overscroll-behavior:contain;-webkit-overflow-scrolling:touch;display:flex;overflow-y:auto}.header-nav .nav-link{border-bottom:1px solid var(--border-light);padding:.85rem .25rem;font-size:1rem;display:block}.header-nav .search-trigger-btn{flex:none;order:-1;justify-content:flex-start;width:100%;min-width:0;max-width:none;margin-bottom:.5rem;margin-left:0}.header-container .nav-dashboard{margin-left:auto}.nav-item:before{display:none}.nav-item .nav-caret{display:inline-block}.nav-item.open .nav-caret{transform:rotate(180deg)}.nav-dropdown{opacity:1;visibility:visible;min-width:0;max-width:none;max-height:none;box-shadow:none;border:none;border-left:2px solid var(--border-light);border-radius:0;margin:0 0 .25rem .25rem;padding:0 0 0 .5rem;display:none;position:static;overflow:visible;transform:none}.nav-item.open .nav-dropdown{display:block}.nav-item:hover .nav-dropdown,.nav-item:focus-within .nav-dropdown,.nav-item.open .nav-dropdown{transform:none}.nav-drop-link{padding:.55rem .6rem;font-size:.9rem}.search-kbd-group{display:none}}.back-btn{color:var(--text-secondary);background:var(--bg-primary);border:1px solid var(--border-light);box-shadow:var(--shadow-sm);border-radius:999px;align-items:center;gap:.5rem;margin-bottom:1.25rem;padding:.45rem .95rem;font-size:.85rem;font-weight:600;text-decoration:none;transition:all .15s;display:inline-flex}.back-btn i{font-size:.75rem;transition:transform .15s}.back-btn:hover{color:var(--accent-primary);border-color:var(--accent-border);background:var(--accent-light)}.back-btn:hover i{transform:translate(-3px)}.module-hero{background:linear-gradient(180deg, #fff 0%, var(--bg-subtle) 100%);border-bottom:1px solid var(--border-light);padding:3.5rem 1.5rem 3rem}.module-hero-container{max-width:860px;margin:0 auto}.module-badge-row{flex-wrap:wrap;gap:.5rem;margin-bottom:1rem;display:flex}.module-title{color:var(--text-primary);letter-spacing:-.025em;margin-bottom:1rem;font-size:2.25rem;font-weight:800;line-height:1.2}.module-desc{color:var(--text-secondary);margin-bottom:2rem;font-size:1.1rem;line-height:1.6}.module-stats-bar{border-top:1px solid var(--border-light);flex-wrap:wrap;gap:2rem;padding-top:1.5rem;display:flex}.module-stat-item{align-items:center;gap:.75rem;display:flex}.module-stat-item i{color:var(--accent-primary);font-size:1.25rem}.stat-val{color:var(--text-primary);font-size:.95rem;font-weight:700;display:block}.stat-label{color:var(--text-muted);font-size:.75rem;display:block}.module-content-container{max-width:908px;margin:0 auto;padding:3rem 1.5rem}.module-topics-list{flex-direction:column;gap:.75rem;margin-top:1.5rem;display:flex}.lesson-row{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);align-items:center;gap:1rem;padding:.9rem 1.15rem;text-decoration:none;transition:border-color .15s,box-shadow .15s,transform .15s;display:flex}.lesson-row:hover{border-color:var(--accent-border);box-shadow:var(--shadow-md);transform:translateY(-1px)}.lesson-row-num{font-family:var(--font-mono);color:var(--text-muted);background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);flex:none;padding:.3rem .5rem;font-size:.8rem;font-weight:700}.lesson-row:hover .lesson-row-num{color:var(--accent-primary);border-color:var(--accent-border);background:var(--accent-light)}.lesson-row-body{flex-direction:column;flex:1;gap:.1rem;min-width:0;display:flex}.lesson-row-title{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;font-size:1rem;font-weight:700;line-height:1.4;overflow:hidden}.lesson-row-headline{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;font-size:.83rem;line-height:1.45;overflow:hidden}.lesson-row-meta{text-transform:uppercase;letter-spacing:.04em;color:var(--text-faint);font-size:.72rem;font-weight:600}.lesson-row-go{background:var(--bg-subtle);border:1px solid var(--border-light);width:2.25rem;height:2.25rem;color:var(--text-muted);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:.85rem;transition:all .15s;display:inline-flex}.lesson-row:hover .lesson-row-go{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}@media (max-width:640px){.lesson-row{gap:.75rem;padding:.85rem 1rem}.lesson-row-num{padding:.25rem .4rem;font-size:.72rem}.lesson-row-title{white-space:normal;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:.95rem;display:-webkit-box}.lesson-row-headline{white-space:normal;-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box}.lesson-row-go{display:none}.section-header .badge{white-space:normal;text-align:left;max-width:100%;line-height:1.45}}.module-topic-card{border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);background:#fff;flex-direction:column;gap:1rem;padding:1.75rem;transition:all .2s;display:flex}.module-topic-card:hover{border-color:var(--accent-border);box-shadow:var(--shadow-md);transform:translateY(-2px)}.module-topic-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.5rem;display:flex}.module-topic-badge-group{flex-wrap:wrap;align-items:center;gap:.5rem;display:flex}.lesson-number-badge{font-size:.75rem;font-family:var(--font-mono);text-transform:uppercase;color:#fff;background:var(--text-primary);border-radius:var(--radius-sm);padding:.2rem .6rem;font-weight:700}.topic-read-time{color:var(--text-muted);font-size:.8rem}.module-topic-title{color:var(--text-primary);margin-bottom:.4rem;font-size:1.35rem;font-weight:700}.module-topic-title a{color:inherit;text-decoration:none;transition:color .15s}.module-topic-title a:hover{color:var(--accent-primary)}.module-topic-headline{color:var(--text-secondary);margin-bottom:.6rem;font-size:.95rem;font-weight:500;line-height:1.5}.module-topic-takeaways{background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-md);overflow:hidden}.takeaways-preview-title{color:var(--text-primary);pointer-events:none;-webkit-user-select:none;user-select:none;align-items:center;gap:.4rem;padding:.6rem 1rem;font-size:.72rem;font-weight:700;list-style:none;display:flex}.takeaways-preview-title::-webkit-details-marker{display:none}.takeaways-chevron{color:var(--text-muted);margin-left:auto;font-size:.7rem;transition:transform .2s;display:none}.module-topic-takeaways[open] .takeaways-chevron{transform:rotate(180deg)}.module-takeaways-list{flex-direction:column;gap:.3rem;padding:0 1rem .85rem;font-size:.78rem;list-style:none;display:flex}.module-takeaways-list li{color:var(--text-secondary);align-items:flex-start;gap:.5rem;font-size:.85rem;line-height:1.45;display:flex}.module-topic-footer{border-top:1px solid var(--border-light);justify-content:space-between;align-items:center;margin-top:.5rem;padding-top:1rem;display:flex}.module-sections-count{color:var(--text-muted);font-size:.8rem}.btn-open-lesson{color:#fff;background:var(--accent-primary);border-radius:var(--radius-md);align-items:center;gap:.45rem;padding:.5rem 1rem;font-size:.875rem;font-weight:600;text-decoration:none;transition:background .15s;display:inline-flex}.btn-open-lesson:hover{background:var(--accent-hover)}.search-trigger-btn{background:var(--bg-subtle);border:1px solid var(--border-light);min-width:180px;max-width:260px;height:36px;color:var(--text-muted);cursor:pointer;white-space:nowrap;border-radius:8px;flex:0 210px;order:20;align-items:center;gap:.6rem;margin-left:auto;padding:0 .6rem 0 .85rem;font-family:inherit;font-size:.9rem;transition:all .15s;display:inline-flex;overflow:hidden}.search-trigger-btn .search-btn-text{text-align:left;text-overflow:ellipsis;flex:auto;min-width:0;overflow:hidden}.search-trigger-btn:hover{border-color:var(--accent-border);color:var(--text-secondary);background:var(--bg-primary);box-shadow:0 0 0 3px var(--accent-ring)}.search-trigger-btn:focus-visible{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-ring);outline:none}.search-kbd-group{flex:none;align-items:center;gap:4px;margin-left:auto;display:inline-flex}.search-kbd{min-width:22px;height:22px;font-size:.72rem;font-weight:500;line-height:1;font-family:var(--font-mono);color:var(--text-muted);background:var(--bg-primary);border:1px solid var(--border-light);border-bottom-width:2px;border-radius:6px;justify-content:center;align-items:center;padding:0 5px;display:inline-flex}.search-trigger-btn:hover .search-kbd{background:var(--bg-subtle);border-color:var(--border-subtle);color:var(--text-secondary)}.main-content{flex:1;width:100%}.site-footer{background:var(--bg-primary);border-top:1px solid var(--border-light);margin-top:4rem;padding:2.5rem 1.5rem 2rem}.footer-container{max-width:var(--max-width);flex-direction:column;gap:1.5rem;margin:0 auto;display:flex}.footer-top{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:2rem;display:flex}.footer-desc{max-width:480px;color:var(--text-muted);margin-top:.5rem;font-size:.875rem}.footer-links{gap:2rem;display:flex}.footer-col h5{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:.75rem;font-size:.8rem}.footer-col ul{flex-direction:column;gap:.5rem;list-style:none;display:flex}.footer-col a{color:var(--text-secondary);font-size:.875rem;text-decoration:none;transition:color .15s}.footer-col a:hover{color:var(--accent-primary)}.footer-note{align-items:center;gap:.4rem;display:inline-flex}.footer-note i{color:var(--accent-primary)}.footer-bottom{border-top:1px solid var(--border-light);color:var(--text-muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;padding-top:1.5rem;font-size:.8rem;display:flex}.footer-brand-text{font-family:"Sora", var(--font-sans);letter-spacing:-.03em;color:var(--text-primary);font-size:1.35rem;font-weight:800;display:inline-block}.back-to-top{z-index:90;border:1px solid var(--border-light);background:var(--bg-primary);width:44px;height:44px;color:var(--text-secondary);cursor:pointer;box-shadow:var(--shadow-md);opacity:0;pointer-events:none;border-radius:50%;justify-content:center;align-items:center;font-size:1rem;transition:opacity .25s,transform .25s,background .15s,color .15s,border-color .15s;display:inline-flex;position:fixed;bottom:2rem;right:2rem;transform:translateY(12px)}.back-to-top.visible{opacity:1;pointer-events:auto;transform:translateY(0)}.back-to-top:hover{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff;box-shadow:var(--shadow-lg)}@media (max-width:768px){.back-to-top{width:40px;height:40px;font-size:.9rem;bottom:1.25rem;right:1.25rem}}.search-modal{z-index:200;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0f172a66;justify-content:center;align-items:flex-start;padding:4rem 1.5rem;display:none;position:fixed;top:0;bottom:0;left:0;right:0}.search-modal.active{display:flex}.search-dialog{background:var(--bg-primary);border-radius:var(--radius-lg);border:1px solid var(--border-light);width:100%;max-width:600px;box-shadow:var(--shadow-lg);overflow:hidden}.search-input-box{border-bottom:1px solid var(--border-light);align-items:center;gap:.75rem;padding:1rem 1.25rem;display:flex}.search-input{color:var(--text-primary);background:0 0;border:none;outline:none;flex:1;font-family:inherit;font-size:1.05rem}.search-close-btn{cursor:pointer;color:var(--text-muted);background:0 0;border:none;padding:.25rem;font-size:1.1rem}.search-results-list{max-height:380px;padding:.5rem;list-style:none;overflow-y:auto}.search-result-item{border-radius:var(--radius-md);cursor:pointer;padding:.85rem 1rem;text-decoration:none;transition:background .15s;display:block}.search-result-item:hover,.search-result-item.selected{background:var(--accent-light)}.search-result-title{color:var(--text-primary);margin-bottom:.25rem;font-size:.95rem;font-weight:600}.search-result-meta{color:var(--accent-primary);margin-bottom:.25rem;font-size:.8rem}.search-result-desc{color:var(--text-muted);font-size:.825rem;line-height:1.4}.search-empty{text-align:center;color:var(--text-muted);padding:2rem;font-size:.9rem}a.badge{text-decoration:none}a.badge:visited{color:inherit}a.badge-primary:visited{color:var(--accent-primary)}a.badge-secondary:visited{color:var(--text-secondary)}.badge{border-radius:var(--radius-sm);letter-spacing:.02em;align-items:center;padding:.2rem .55rem;font-size:.75rem;font-weight:600;display:inline-flex}.badge-primary{background:var(--accent-light);color:var(--accent-primary);border:1px solid var(--accent-border)}.badge-secondary{background:var(--bg-elevated);color:var(--text-secondary);border:1px solid var(--border-light)}@media (max-width:768px){.header-container{gap:.75rem;padding:0 1rem}.brand-link{gap:.4rem;font-size:1.2rem}.brand-logo-img{height:48px}.brand-link-footer .brand-logo-img{height:56px}.nav-toggle{display:inline-flex}.header-nav{top:var(--header-height);background:var(--bg-primary);border-bottom:1px solid var(--border-light);box-shadow:var(--shadow-lg);z-index:90;flex-direction:column;align-items:stretch;gap:0;padding:.5rem 1rem 1rem;display:none;position:absolute;left:0;right:0}.header-nav.open{display:flex}.header-nav .nav-link{border-bottom:1px solid var(--border-light);padding:.85rem .25rem;font-size:1rem;display:block}.header-nav .search-trigger-btn{flex:none;order:-1;justify-content:flex-start;width:100%;min-width:0;max-width:none;margin-bottom:.5rem;margin-left:0}.search-kbd-group{display:none}.module-topic-badge-group{-webkit-overflow-scrolling:touch;scrollbar-width:none;flex-wrap:nowrap;width:100%;padding-bottom:.25rem;overflow-x:auto}.module-topic-badge-group::-webkit-scrollbar{display:none}.module-topic-badge-group>*{flex:none}.takeaways-preview-title{pointer-events:auto;cursor:pointer;padding:.75rem 1.1rem;font-size:.8rem}.takeaways-chevron{display:inline-block}.module-takeaways-list{padding:0 1.1rem 1rem;font-size:.85rem}.footer-links{flex-direction:column;gap:1.5rem}}.home-hero{background:linear-gradient(180deg, #fff 0%, var(--bg-subtle) 100%);border-bottom:1px solid var(--border-light);text-align:center;padding:4.5rem 1.5rem 3.5rem}.hero-container{flex-direction:column;align-items:center;max-width:820px;margin:0 auto;display:flex}.hero-logo{width:340px;max-width:100%;height:auto;margin-bottom:1.5rem}.hero-brand{font-family:"Sora", var(--font-sans);letter-spacing:-.03em;color:var(--text-primary);margin-bottom:1.25rem;font-size:1.6rem;font-weight:800}.hero-badge{background:var(--accent-light);border:1px solid var(--accent-border);color:var(--accent-primary);border-radius:9999px;align-items:center;gap:.5rem;margin-bottom:1.5rem;padding:.35rem .85rem;font-size:.825rem;font-weight:600;display:inline-flex}.badge-dot{font-size:.6rem}.hero-title{letter-spacing:-.035em;color:var(--text-primary);margin-bottom:1.25rem;font-size:2.75rem;font-weight:800;line-height:1.2}.hero-subtitle{color:var(--text-secondary);max-width:680px;margin-bottom:2.25rem;font-size:1.15rem;line-height:1.6}.hero-search-bar{background:var(--bg-primary);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);width:100%;max-width:560px;box-shadow:var(--shadow-md);color:var(--text-muted);cursor:pointer;align-items:center;gap:.75rem;padding:.85rem 1.25rem;font-size:.95rem;transition:all .2s;display:flex}.hero-search-bar:hover{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-ring);color:var(--text-secondary)}.hero-kbd-group{flex:none;align-items:center;gap:4px;margin-left:auto;display:inline-flex}.hero-kbd{min-width:24px;height:24px;font-family:var(--font-mono);background:var(--bg-subtle);border:1px solid var(--border-light);border-bottom-width:2px;border-radius:6px;justify-content:center;align-items:center;padding:0 6px;font-size:.8rem;line-height:1;display:inline-flex}.hero-search-rotate{white-space:nowrap;flex:1;min-width:0;overflow:hidden}.hero-rotate-text{color:var(--text-secondary);font-weight:500}.hero-rotate-cursor{color:var(--accent-primary);font-weight:300;animation:.8s step-end infinite blink-cursor}@keyframes blink-cursor{0%,to{opacity:1}50%{opacity:0}}.home-content-container{max-width:var(--max-width);flex-direction:column;gap:4rem;margin:0 auto;padding:3rem 1.5rem;display:flex}.home-section{flex-direction:column;gap:2rem;display:flex}.section-header{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:1rem;display:flex}.section-tag{text-transform:uppercase;letter-spacing:.05em;color:var(--accent-primary);margin-bottom:.4rem;font-size:.8rem;font-weight:700}.section-heading{letter-spacing:-.025em;color:var(--text-primary);margin-bottom:.35rem;font-size:1.85rem;font-weight:800}.section-desc{color:var(--text-muted);max-width:680px;font-size:1rem}.topics-grid{grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:1.75rem;display:grid}.topic-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);flex-direction:column;padding:1.75rem;transition:all .2s;display:flex}.topic-card:hover{border-color:var(--accent-border);box-shadow:var(--shadow-md);transform:translateY(-2px)}.topic-card-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.topic-card-time{color:var(--text-muted);font-size:.8rem}.topic-card-title{margin-bottom:.75rem;font-size:1.35rem;font-weight:700;line-height:1.35}.topic-card-title a{color:var(--text-primary);text-decoration:none;transition:color .15s}.topic-card-title a:hover{color:var(--accent-primary)}.topic-card-desc{color:var(--text-secondary);flex:1;margin-bottom:1.25rem;font-size:.95rem;line-height:1.55}.topic-card-footer{border-top:1px solid var(--border-light);padding-top:1.25rem}.topic-card-link{color:var(--accent-primary);align-items:center;gap:.5rem;font-size:.925rem;font-weight:600;text-decoration:none;display:inline-flex}.topic-card-link .arrow{transition:transform .15s}.topic-card-link:hover .arrow{transform:translate(4px)}.home-showcase-banner{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:2.5rem}.showcase-content h2{color:var(--text-primary);margin:.75rem 0 .5rem;font-size:1.75rem;font-weight:800}.showcase-content p{color:var(--text-secondary);max-width:650px;margin-bottom:1.5rem;font-size:1rem;line-height:1.6}.showcase-links{flex-wrap:wrap;gap:1rem;display:flex}.btn-primary-action{background:var(--accent-primary);color:#fff;border-radius:var(--radius-md);padding:.65rem 1.25rem;font-size:.925rem;font-weight:600;text-decoration:none;transition:background .15s}.btn-primary-action:hover{background:var(--accent-hover)}.btn-secondary-action{background:var(--bg-elevated);border:1px solid var(--border-light);color:var(--text-primary);border-radius:var(--radius-md);padding:.65rem 1.25rem;font-size:.925rem;font-weight:600;text-decoration:none;transition:background .15s}.btn-secondary-action:hover{background:var(--bg-subtle)}.roadmap-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;display:grid}.roadmap-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);flex-direction:column;padding:1.5rem;display:flex}.roadmap-code{font-size:.75rem;font-family:var(--font-mono);color:var(--text-muted);margin-bottom:.4rem;font-weight:700}.roadmap-title{color:var(--text-primary);margin-bottom:.5rem;font-size:1.1rem;font-weight:700}.roadmap-desc{color:var(--text-secondary);flex:1;margin-bottom:1.25rem;font-size:.875rem;line-height:1.5}.roadmap-meta{border-top:1px solid var(--border-light);color:var(--text-muted);justify-content:space-between;align-items:center;padding-top:.75rem;font-size:.75rem;display:flex}.series-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem;display:grid}.series-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);align-items:flex-start;gap:1rem;padding:1.1rem 1.25rem;text-decoration:none;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex}.series-card:hover{border-color:var(--accent-border);box-shadow:var(--shadow-md);transform:translateY(-2px)}.series-card-icon{background:var(--accent-light);width:2.75rem;height:2.75rem;color:var(--accent-primary);border-radius:.8rem;flex:none;justify-content:center;align-items:center;font-size:1.2rem;display:inline-flex}.series-card-body{flex-direction:column;gap:.15rem;min-width:0;display:flex}.series-card-title{color:var(--text-primary);font-size:.98rem;font-weight:700;line-height:1.35}.series-card-desc{color:var(--text-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:.83rem;line-height:1.5;display:-webkit-box;overflow:hidden}.series-card-meta{color:var(--accent-primary);align-items:center;gap:.35rem;margin-top:.3rem;font-size:.78rem;font-weight:700;display:inline-flex}.series-card-meta i{font-size:.7rem;transition:transform .15s}.series-card:hover .series-card-meta i{transform:translate(3px)}.subtopic-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}.subtopic-card{height:420px}.subtopic-code-row{justify-content:space-between;align-items:center;gap:.5rem;margin-bottom:.4rem;display:flex}.subtopic-code-row .roadmap-code{margin-bottom:0}.subtopic-scroll-hint{text-transform:uppercase;letter-spacing:.04em;color:var(--accent-primary);background:var(--accent-light);border:1px solid var(--accent-border);white-space:nowrap;border-radius:999px;align-items:center;gap:.3rem;padding:.15rem .5rem;font-size:.7rem;font-weight:600;display:inline-flex}.subtopic-scroll-hint i{font-size:.65rem}.subtopic-card .roadmap-desc{flex:none;margin-bottom:.75rem}.subtopic-card .roadmap-title a{color:inherit;text-decoration:none;transition:color .15s}.subtopic-card .roadmap-title a:hover{color:var(--accent-primary)}.subtopic-chapter-list{border-top:1px solid var(--border-light);scrollbar-width:thin;scrollbar-color:var(--border-subtle) var(--bg-elevated);background:linear-gradient(var(--bg-primary) 30%, #fff0) center top, linear-gradient(#fff0, var(--bg-primary) 70%) center bottom, radial-gradient(farthest-side at 50% 0, #0f172a29, #0f172a00) center top, radial-gradient(farthest-side at 50% 100%, #0f172a29, #0f172a00) center bottom;background-repeat:no-repeat;background-size:100% 1.75rem,100% 1.75rem,100% .6rem,100% .6rem;background-attachment:local,local,scroll,scroll;flex-direction:column;flex:auto;gap:.15rem;min-height:0;padding:.5rem .5rem .75rem 0;list-style:none;display:flex;overflow-y:auto}.subtopic-chapter-list::-webkit-scrollbar{width:8px}.subtopic-chapter-list::-webkit-scrollbar-track{background:var(--bg-elevated);border-radius:999px}.subtopic-chapter-list::-webkit-scrollbar-thumb{background:var(--border-subtle);border-radius:999px}.subtopic-chapter-list::-webkit-scrollbar-thumb:hover{background:var(--text-faint)}.subtopic-chapter-list li a{color:var(--text-secondary);border-radius:var(--radius-sm);padding:.3rem .45rem;font-size:.82rem;line-height:1.4;text-decoration:none;transition:background .15s,color .15s;display:block}.subtopic-chapter-list li a:hover{background:var(--bg-subtle);color:var(--accent-primary)}@media (max-width:768px){.hero-title{font-size:2rem}.topics-grid{grid-template-columns:1fr}.subtopic-card{height:auto}.subtopic-chapter-list{max-height:220px}}.reading-progress-bar{top:var(--header-height);background:var(--accent-primary);z-index:99;width:0%;height:3px;transition:width .1s ease-out;position:fixed;left:0}body:has(.topic-page-layout) .header-container{max-width:1440px;padding:0 2rem}.topic-page-layout{grid-template-columns:300px minmax(0,1fr) 270px;align-items:start;gap:2.5rem;max-width:1440px;margin:0 auto;padding:2rem 2rem 4rem;display:grid}.topic-main-column{width:100%;min-width:0;max-width:860px;margin:0 auto}.topic-breadcrumbs{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:1.5rem;font-size:.85rem;display:flex}.topic-breadcrumbs a{color:var(--text-secondary);text-decoration:none;transition:color .15s}.topic-breadcrumbs a:hover{color:var(--accent-primary)}.topic-breadcrumbs .crumb-sep{color:var(--text-faint)}.toc-card-head{justify-content:space-between;align-items:center;gap:.5rem;margin-bottom:.85rem;display:flex}.toc-card-head .toc-title{margin-bottom:0}.panel-collapse{border-radius:var(--radius-sm);color:var(--text-faint);cursor:pointer;background:0 0;border:none;flex:none;padding:.3rem .4rem;font-size:.78rem;transition:all .15s}.panel-collapse:hover{color:var(--accent-primary);background:var(--accent-light)}.sidebar-rail{z-index:90;background:var(--bg-primary);border:1px solid var(--border-light);width:34px;height:68px;color:var(--text-muted);cursor:pointer;justify-content:center;align-items:center;font-size:.8rem;transition:all .15s;display:none;position:fixed;top:50%;transform:translateY(-50%)}.rail-left{border-left:none;border-radius:0 10px 10px 0;left:0}.rail-right{border-right:none;border-radius:10px 0 0 10px;right:0}.sidebar-rail:hover{color:var(--accent-primary);border-color:var(--accent-border);background:var(--accent-light)}.topic-page-layout.no-left .rail-left,.topic-page-layout.no-right .rail-right{display:inline-flex}@media (max-width:1200px){.rail-right{display:none!important}}@media (max-width:992px){.sidebar-rail{display:none!important}}.topic-page-layout.no-left{grid-template-columns:minmax(0,1fr) 270px}.topic-page-layout.no-left .course-sidebar{display:none}.topic-page-layout.no-right{grid-template-columns:300px minmax(0,1fr)}.topic-page-layout.no-right .topic-sidebar{display:none}.topic-page-layout.no-left.no-right{grid-template-columns:minmax(0,1fr)}.topic-page-layout.no-left.no-right .topic-main-column{max-width:960px}.topic-header{border-bottom:1px solid var(--border-light);margin-bottom:2.5rem;padding-bottom:2rem}.topic-module-tag{text-transform:uppercase;letter-spacing:.05em;color:var(--accent-primary);align-items:center;gap:.5rem;margin-bottom:.75rem;font-size:.8rem;font-weight:600;display:inline-flex}.topic-title{letter-spacing:-.03em;color:var(--text-primary);margin-bottom:1rem;font-size:2.4rem;font-weight:800;line-height:1.25}.topic-headline{color:var(--text-secondary);margin-bottom:1.25rem;font-size:1.2rem;font-weight:400;line-height:1.5}.topic-meta-strip{color:var(--text-muted);align-items:center;gap:1.25rem;font-size:.85rem;display:flex}.topic-meta-item{align-items:center;gap:.35rem;display:flex}.takeaways-box{background:var(--bg-primary);border:1px solid var(--border-light);border-left:4px solid var(--accent-primary);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);margin-bottom:2.5rem;padding:1.5rem}.takeaways-box:not([open]){padding-top:1rem;padding-bottom:1rem}.takeaways-header{color:var(--text-primary);letter-spacing:-.01em;cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:.5rem;font-size:1rem;font-weight:700;list-style:none;display:flex}.takeaways-header::-webkit-details-marker{display:none}.takeaways-header::marker{content:""}.takeaways-box:not([open]) .takeaways-header{margin-bottom:0}.takeaways-box[open] .takeaways-header{margin-bottom:1rem}.takeaways-count{color:var(--text-muted);background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:999px;padding:.1rem .55rem;font-size:.75rem;font-weight:600}.takeaways-toggle{color:var(--text-muted);margin-left:auto;font-size:.8rem;transition:transform .2s}.takeaways-box[open] .takeaways-toggle{transform:rotate(180deg)}.takeaways-header:hover .takeaways-toggle{color:var(--accent-primary)}@media (max-width:640px){.takeaways-box{padding-left:1rem;padding-right:1rem}.takeaways-header{gap:.4rem;font-size:.88rem}.takeaways-title{white-space:nowrap;text-overflow:ellipsis;min-width:0;overflow:hidden}.takeaways-count{flex:none;font-size:.68rem}.table-wrap table{min-width:600px}.topic-table th,.topic-table td,.comparison-table th,.comparison-table td{padding:.55rem .65rem;font-size:.82rem}}.takeaways-list{flex-direction:column;gap:.65rem;list-style:none;display:flex}.takeaways-list li{color:var(--text-secondary);align-items:flex-start;gap:.65rem;font-size:.925rem;line-height:1.5;display:flex}.takeaway-bullet{color:var(--accent-primary);flex-shrink:0;margin-top:.2rem;font-size:.85rem}.article-section{scroll-margin-top:calc(var(--header-height) + 1.5rem);margin-bottom:3rem}.article-section h2{letter-spacing:-.02em;color:var(--text-primary);border-bottom:1px solid var(--border-light);margin-bottom:1.25rem;padding-bottom:.5rem;font-size:1.55rem;font-weight:700}.article-section h4{color:var(--text-primary);margin:1.5rem 0 .75rem;font-size:1.1rem;font-weight:600}.article-section p{color:var(--text-secondary);margin-bottom:1.25rem;font-size:1.025rem;line-height:1.7}.article-section p a,.article-section li a{color:var(--accent-primary);text-underline-offset:2px;text-decoration:underline}.article-section p a:visited,.article-section li a:visited{color:var(--accent-primary)}.article-section p a:hover,.article-section li a:hover{color:var(--accent-hover)}.article-section ul,.article-section ol{color:var(--text-secondary);flex-direction:column;gap:.6rem;margin:0 0 1.5rem 1.5rem;font-size:1rem;line-height:1.6;display:flex}.callout{border-radius:var(--radius-md);border:1px solid #0000;margin:1.75rem 0;padding:1.25rem 1.5rem}.callout-title{margin-bottom:.5rem;font-size:.95rem;font-weight:700}.callout-info{background:var(--accent-light);border-color:var(--accent-border);color:var(--text-secondary)}.callout-info .callout-title{color:var(--accent-primary)}.callout-warning{background:var(--status-warn-bg);border-color:var(--status-warn-border);color:var(--text-secondary)}.callout-warning .callout-title{color:var(--status-warn-text)}.callout-danger{background:var(--status-danger-bg);border-color:var(--status-danger-border);color:var(--text-secondary)}.callout-danger .callout-title{color:var(--status-danger-text)}.formula-box{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-md);text-align:center;font-family:var(--font-mono);color:var(--text-primary);box-shadow:var(--shadow-sm);margin:1rem 0 1.25rem;padding:.85rem 1.25rem;font-size:1.1rem;font-weight:600}.concept-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.25rem;margin:1.5rem 0;display:grid}.concept-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:1.25rem}.concept-icon{color:var(--accent-primary);margin-bottom:.5rem;font-size:1.5rem}.concept-card h4,.concept-title{color:var(--text-primary);margin-top:0;margin-bottom:.5rem;font-size:1rem;font-weight:700;line-height:1.4}.concept-card p,.concept-desc{color:var(--text-secondary);margin-bottom:0;font-size:.9rem;line-height:1.5}.comparison-table{border-collapse:collapse;background:var(--bg-primary);border-radius:var(--radius-md);border:1px solid var(--border-light);width:100%;margin:1.5rem 0;font-size:.925rem;overflow:hidden}.comparison-table th{background:var(--bg-elevated);text-align:left;color:var(--text-primary);border-bottom:1px solid var(--border-light);padding:.85rem 1rem;font-weight:600}.comparison-table td{border-bottom:1px solid var(--border-light);color:var(--text-secondary);padding:.85rem 1rem;line-height:1.5}.comparison-table tr:last-child td{border-bottom:none}.steps-list{flex-direction:column;gap:.85rem;margin:1.5rem 0;display:flex}.step-item{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);align-items:flex-start;gap:1rem;padding:1rem 1.25rem;display:flex}.step-num{background:var(--accent-light);border:1px solid var(--accent-border);width:28px;height:28px;color:var(--accent-primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.85rem;font-weight:700;display:flex}.course-sidebar{top:calc(var(--header-height) + 2rem);max-height:calc(100vh - var(--header-height) - 4rem);overscroll-behavior:contain;scrollbar-width:thin;position:sticky;overflow-y:auto}.course-nav-card{background:var(--bg-subtle)}.course-sidebar .course-nav-list{margin-bottom:0}.course-nav-count{color:var(--accent-primary);margin-bottom:.75rem;font-size:.78rem;font-weight:600}.course-nav-list{flex-direction:column;gap:.25rem;margin-bottom:1rem;list-style:none;display:flex}.course-nav-link{border-radius:var(--radius-md);color:var(--text-secondary);border:1px solid #0000;align-items:flex-start;gap:.6rem;padding:.5rem .6rem;font-size:.85rem;line-height:1.45;text-decoration:none;transition:all .15s;display:flex}.course-nav-link:hover{background:var(--bg-primary);border-color:var(--border-light);color:var(--text-primary)}.course-nav-link.active{background:var(--bg-primary);border-color:var(--accent-border);color:var(--text-primary);box-shadow:var(--shadow-sm);font-weight:600}.course-nav-index{color:var(--text-muted);justify-content:center;align-items:center;font-size:.7rem;font-weight:700;display:inline-flex;position:absolute;top:0;bottom:0;left:0;right:0}.course-nav-link.active .course-nav-index{color:var(--accent-primary)}.course-nav-link.is-done .course-nav-index{color:#fff}.course-nav-ring{flex:none;width:30px;height:30px;margin-top:.05rem;position:relative}.course-nav-ring svg{width:30px;height:30px;display:block;transform:rotate(-90deg)}.course-nav-ring .ring-track{fill:none;stroke:var(--border-light);stroke-width:3px}.course-nav-ring .ring-fill{fill:none;stroke:var(--border-subtle);stroke-width:3px;stroke-linecap:round;stroke-dasharray:81.68;stroke-dashoffset:81.68px}.course-nav-link.active .ring-fill{stroke:var(--accent-primary)}.course-nav-link.is-done .course-nav-ring{background:var(--accent-primary);border-radius:50%}.course-nav-link.is-done .ring-track{stroke:#ffffff59}.course-nav-link.is-done .ring-fill{stroke:#fff;stroke-dashoffset:0}.course-nav-link.is-done .course-nav-index{font-size:.62rem}.course-nav-text{min-width:0}.course-nav-all{color:var(--accent-primary);border-top:1px solid var(--border-light);align-items:center;gap:.45rem;width:100%;padding-top:.85rem;font-size:.82rem;font-weight:600;text-decoration:none;display:inline-flex}.course-nav-all:hover{color:var(--accent-hover);text-decoration:underline}.course-drawer-backdrop{z-index:150;background:#0f172a73;justify-content:center;align-items:flex-end;display:none;position:fixed;top:0;bottom:0;left:0;right:0}.course-drawer-backdrop.open{display:flex}.course-drawer{background:var(--bg-primary);border-top:1px solid var(--border-light);width:100%;max-height:78vh;padding:1rem 1rem calc(1rem + env(safe-area-inset-bottom,0px));border-radius:16px 16px 0 0;flex-direction:column;display:flex;transform:translateY(12px);box-shadow:0 -12px 32px -12px #0f172a59}.course-drawer-backdrop.open .course-drawer{transform:none}.course-drawer-head{border-bottom:1px solid var(--border-light);justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:.75rem;padding-bottom:.75rem;display:flex}.course-drawer-kicker{color:var(--text-primary);font-size:.85rem;font-weight:700;line-height:1.4}.course-drawer-count{color:var(--accent-primary);margin-top:.15rem;font-size:.78rem;font-weight:600}.course-drawer-close{border:1px solid var(--border-light);background:var(--bg-subtle);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;border-radius:50%;flex:none;font-size:.95rem}.course-drawer-close:hover{color:var(--text-primary);border-color:var(--border-subtle)}.course-drawer-list{overscroll-behavior:contain;scrollbar-width:thin;margin-bottom:.75rem;padding-right:.25rem;overflow-y:auto}.topic-sidebar{top:calc(var(--header-height) + 2rem);flex-direction:column;gap:1.5rem;display:flex;position:sticky}.toc-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:1.25rem}.toc-title{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:.85rem;font-size:.85rem;font-weight:700}.toc-list{flex-direction:column;gap:.5rem;list-style:none;display:flex}.toc-link{color:var(--text-secondary);border-radius:var(--radius-sm);padding:.25rem .5rem;font-size:.85rem;line-height:1.4;text-decoration:none;transition:all .15s;display:block}.toc-link:hover,.toc-link.active{background:var(--accent-light);color:var(--accent-primary);font-weight:500}.toc-list-scroll{scrollbar-width:thin;scrollbar-color:var(--border-subtle) var(--bg-elevated);background:linear-gradient(var(--bg-subtle) 30%, #f8fafc00) center top, linear-gradient(#f8fafc00, var(--bg-subtle) 70%) center bottom, radial-gradient(farthest-side at 50% 0, #0f172a24, #0f172a00) center top, radial-gradient(farthest-side at 50% 100%, #0f172a24, #0f172a00) center bottom;background-repeat:no-repeat;background-size:100% 1.5rem,100% 1.5rem,100% .55rem,100% .55rem;background-attachment:local,local,scroll,scroll;max-height:22rem;padding-right:.4rem;overflow-y:auto}.toc-list-scroll::-webkit-scrollbar{width:8px}.toc-list-scroll::-webkit-scrollbar-track{background:var(--bg-elevated);border-radius:999px}.toc-list-scroll::-webkit-scrollbar-thumb{background:var(--border-subtle);border-radius:999px}.toc-list-scroll::-webkit-scrollbar-thumb:hover{background:var(--text-faint)}.topic-nav-footer{border-top:1px solid var(--border-light);justify-content:space-between;gap:1.5rem;margin-top:4rem;padding-top:2rem;display:flex}.topic-nav-btn{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);flex-direction:column;flex:1;gap:.25rem;max-width:360px;padding:1rem 1.25rem;text-decoration:none;transition:all .15s;display:flex}.topic-nav-btn:hover{border-color:var(--accent-border);box-shadow:var(--shadow-sm);background:var(--accent-light)}.topic-nav-label{text-transform:uppercase;color:var(--accent-primary);font-size:.75rem;font-weight:600}.topic-nav-title{color:var(--text-primary);font-size:.95rem;font-weight:600}@media (max-width:1200px){.topic-page-layout{grid-template-columns:270px minmax(0,1fr);gap:2rem}.topic-sidebar{display:none}.topic-main-column{max-width:100%}}@media (max-width:992px){.topic-page-layout{grid-template-columns:1fr;gap:2rem;padding:1.5rem 1.25rem 4rem}.topic-page-layout.no-left,.topic-page-layout.no-right,.topic-page-layout.no-left.no-right{grid-template-columns:1fr}.course-sidebar{max-height:none;position:static;overflow:visible}.course-nav-list{scrollbar-width:thin;max-height:16rem;padding-right:.4rem;overflow-y:auto}}.topic-figure{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin:2rem 0 2.5rem;overflow:hidden}.topic-figure-img,.topic-figure-svg{background:#fff;width:100%;height:auto;display:block}.topic-figure figcaption{background:var(--bg-subtle);border-top:1px solid var(--border-light);color:var(--text-secondary);padding:.85rem 1.25rem;font-size:.85rem;line-height:1.5}.topic-figure figcaption i{color:var(--accent-primary);margin-right:.35rem}.takeaway-bullet{color:var(--accent-primary);margin-right:.5rem;font-size:.85rem}.m3d{border:1px solid var(--border-light);border-radius:var(--radius-lg);background:var(--bg-primary);box-shadow:var(--shadow-sm);margin:2rem 0 2.5rem;overflow:hidden}.m3d-head{border-bottom:1px solid var(--border-light);background:linear-gradient(180deg, var(--accent-light), var(--bg-primary));padding:1rem 1.25rem}.m3d-title{color:var(--text-primary);align-items:center;gap:.5rem;font-size:.95rem;font-weight:700;display:flex}.m3d-title i{color:var(--accent-primary)}.m3d-sub{color:var(--text-muted);margin-top:.35rem;font-size:.83rem;line-height:1.55}.m3d-body{grid-template-columns:minmax(0,1fr) 286px;align-items:start;display:grid}.m3d.m3d-expanded{z-index:9999;background:var(--bg-primary);border:0;border-radius:0;flex-direction:column;margin:0;display:flex;position:fixed;top:0;bottom:0;left:0;right:0}.m3d.m3d-expanded .m3d-head,.m3d.m3d-expanded .m3d-controls{flex:none}.m3d.m3d-expanded .m3d-body{flex:auto;grid-template-columns:minmax(0,1fr) 300px;height:100%;min-height:0}.m3d.m3d-expanded .m3d-panel{height:100%;min-height:0;max-height:none;display:block}.m3d.m3d-expanded .m3d-stage{height:100%;min-height:0;max-height:none}.m3d-stage{touch-action:none;background:radial-gradient(circle at 50% 28%,#fff 0%,#eef4fa 100%);height:560px;min-height:460px;max-height:72vh;position:relative;overflow:hidden}.m3d-canvas{width:100%;height:100%;display:block;position:absolute;top:0;bottom:0;left:0;right:0}.m3d-fallback{text-align:center;color:var(--text-muted);justify-content:center;align-items:center;padding:1.5rem;font-size:.88rem;display:flex;position:absolute;top:0;bottom:0;left:0;right:0}.m3d-labels{pointer-events:none;z-index:2;position:absolute;top:0;bottom:0;left:0;right:0;overflow:hidden}.m3d-tag{border:1px solid var(--border-light);border-left:3px solid var(--tag-color,var(--accent-primary));color:var(--text-secondary);white-space:nowrap;letter-spacing:.01em;pointer-events:auto;cursor:pointer;background:#fffffff0;border-radius:999px;align-items:center;gap:.35rem;padding:.16rem .5rem .16rem .42rem;font-size:.68rem;font-weight:600;display:none;position:absolute;top:0;left:0;box-shadow:0 2px 6px -2px #0f172a40}.m3d-tag.on{display:inline-flex}.m3d-tag.on:hover{border-color:var(--accent-border);color:var(--text-primary);box-shadow:0 0 0 2px var(--accent-ring), 0 3px 8px -2px #0f172a4d}.m3d-tag.selected{color:var(--text-primary);box-shadow:0 0 0 2px var(--accent-ring), 0 3px 8px -2px #0f172a4d}.m3d-tag-dot{background:var(--tag-color,var(--accent-primary));border-radius:50%;width:7px;height:7px}.m3d-topbar{z-index:3;pointer-events:none;scrollbar-width:none;flex-direction:row;justify-content:flex-start;padding-bottom:.15rem;display:flex;position:absolute;top:.6rem;left:.7rem;right:.7rem;overflow-x:auto}.m3d-topbar::-webkit-scrollbar{display:none}.m3d-controls{border-top:1px solid var(--border-light);border-bottom:1px solid var(--border-light);background:var(--bg-subtle);flex-direction:column;align-items:flex-start;gap:.35rem;padding:.6rem .9rem;display:flex}.m3d-modes,.m3d-play{flex-wrap:wrap;gap:.3rem;display:flex}.m3d-mode,.m3d-action{white-space:nowrap;flex:none}.m3d-mode{-webkit-backdrop-filter:blur(8px);color:var(--text-secondary);cursor:pointer;background:#ffffffeb;border:1px solid #0f172a1f;border-radius:999px;padding:.32rem .65rem;font-size:.72rem;font-weight:600;transition:background .15s,color .15s,border-color .15s,box-shadow .15s;box-shadow:0 1px 4px -2px #0f172a40}.m3d-mode:hover{border-color:var(--accent-border);color:var(--accent-primary)}.m3d-mode.active{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff;box-shadow:0 2px 8px -2px #2563eb8c}.m3d-bottombar{pointer-events:auto;border:1px solid var(--border-light);-webkit-backdrop-filter:blur(10px);background:#ffffffe0;border-radius:12px;flex-direction:column;align-items:flex-start;gap:.35rem;max-width:100%;padding:.45rem .55rem;display:flex;box-shadow:0 6px 18px -10px #0f172a59}.m3d-bottombar:empty{display:none}.m3d-dock{z-index:4;pointer-events:none;flex-direction:column;gap:.45rem;display:flex;position:absolute;bottom:.6rem;left:.7rem;right:.7rem}.m3d-dock>*{pointer-events:auto}.m3d-readout{border:1px solid var(--border-light);color:var(--text-secondary);scrollbar-width:thin;background:#fffffff0;border-radius:10px;flex-direction:column;gap:.2rem;max-height:7.2rem;margin:0;padding:.55rem .7rem;font-size:.74rem;line-height:1.5;display:flex;overflow-y:auto}.m3d-readout strong{color:var(--text-primary)}.m3d-readout.has-component{border-color:var(--accent-border);box-shadow:0 6px 16px -8px #0f172a59}.m3d-readout-title{color:var(--text-primary);align-items:center;gap:.4rem;font-size:.78rem;font-weight:700;display:flex}.m3d-readout-dot{border-radius:50%;flex:none;width:9px;height:9px;box-shadow:inset 0 0 0 1px #0f172a2e}.m3d-readout-text{color:var(--text-secondary);scrollbar-width:thin;min-height:0;max-height:4.6em;padding-right:.25rem;overflow-y:auto}.m3d-panel{border-left:1px solid var(--border-light);background:var(--bg-subtle);overscroll-behavior:contain;scrollbar-width:thin;height:560px;min-height:460px;max-height:72vh;padding:.85rem .9rem;overflow-y:auto}.m3d-list-head{color:var(--text-faint);letter-spacing:.07em;text-transform:uppercase;margin:.7rem 0 .3rem;font-size:.66rem;font-weight:700}.m3d-list-head:first-child{margin-top:0}.m3d-item{width:100%;color:var(--text-secondary);text-align:left;cursor:pointer;background:0 0;border:0;border-radius:6px;align-items:center;gap:.5rem;padding:.3rem .4rem;font-size:.78rem;transition:background .15s,color .15s;display:flex}.m3d-item:hover,.m3d-item.active:hover{background:var(--accent-border);color:var(--accent-hover);cursor:pointer}.m3d-item.active{background:var(--accent-light);color:var(--accent-hover)}.m3d-swatch{border-radius:3px;flex:none;width:11px;height:11px;box-shadow:inset 0 0 0 1px #0f172a2e}.m3d-item-label{line-height:1.3}.m3d-toolbar{pointer-events:auto;flex-wrap:nowrap;gap:.3rem;margin-left:0;display:flex}.m3d-action{color:var(--text-secondary);cursor:pointer;background:#fff;border:1px solid #0f172a1f;border-radius:999px;padding:.3rem .65rem;font-size:.7rem;font-weight:600;transition:background .15s,color .15s,border-color .15s,box-shadow .15s;box-shadow:0 1px 3px -2px #0f172a40}.m3d-action:hover{border-color:var(--accent-border);color:var(--accent-primary);background:#fff}.m3d-action:active{transform:translateY(1px)}.m3d-action.is-on{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff;box-shadow:0 2px 8px -2px #2563eb8c}.m3d-action.is-on:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:#fff}.m3d-play .m3d-action{color:#fff;background:#0f172a;border-color:#0f172a}.m3d-play .m3d-action:hover{color:#fff;background:#1e293b;border-color:#1e293b}.m3d-play .m3d-action.is-on{color:#fff;background:#15803d;border-color:#15803d}.m3d-noscript{color:var(--text-muted);padding:1rem 1.25rem;font-size:.84rem}@media (max-width:860px){.m3d-body{grid-template-columns:1fr}.m3d-stage{height:60vh;min-height:360px}.m3d-panel{border-left:0;border-top:1px solid var(--border-light);height:auto;min-height:0;max-height:300px;overflow-y:auto}.m3d.m3d-expanded .m3d-body{grid-template-rows:minmax(0,1fr) auto;grid-template-columns:1fr;overflow-y:auto}.m3d.m3d-expanded .m3d-stage{height:52vh;min-height:46vh}.m3d.m3d-expanded .m3d-panel{border-top:1px solid var(--border-light);height:auto;max-height:34vh}.m3d-readout{font-size:.72rem}}@media (max-width:640px){.m3d-stage{min-height:320px}.m3d-topbar{-webkit-overflow-scrolling:touch;touch-action:pan-x;align-items:center;gap:.4rem;top:.5rem;left:.5rem;right:.5rem}.m3d-toolbar{flex-wrap:nowrap;flex:none}.m3d-mode,.m3d-action{white-space:nowrap;flex:none;padding:.26rem .55rem;font-size:.68rem}.m3d-dock{gap:.35rem;bottom:.5rem;left:.5rem;right:.5rem}.m3d-bottombar{padding:.35rem .45rem}.m3d-readout{max-height:3.6rem;padding:.4rem .55rem;font-size:.68rem;line-height:1.4;overflow:hidden}.m3d-readout-title{font-size:.72rem}.m3d-readout-text{-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}}.lab3d-picker{flex-wrap:wrap;gap:.5rem;margin-bottom:1.25rem;display:flex}.lab3d-tab{border:1px solid var(--border-light);background:var(--bg-primary);color:var(--text-secondary);cursor:pointer;border-radius:999px;align-items:center;gap:.5rem;padding:.5rem .95rem;font-family:inherit;font-size:.85rem;font-weight:600;transition:all .15s;display:inline-flex}.lab3d-tab i{color:var(--text-muted);transition:color .15s}.lab3d-tab:hover{border-color:var(--accent-border);color:var(--text-primary)}.lab3d-tab.active{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff;box-shadow:0 4px 10px -4px #0284c799}.lab3d-tab.active i{color:#fff}.lab3d .m3d{margin-top:0}.lab3d-footer{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;margin-top:1rem;display:flex}.lab3d-tip{color:var(--text-muted);align-items:center;gap:.4rem;font-size:.8rem;display:inline-flex}.lab3d-tip i{color:var(--accent-primary)}.lab3d-lesson-link{text-decoration:none}.topic-mobile-nav{display:none}@media (max-width:768px){.topic-mobile-nav{z-index:96;padding:.5rem .75rem calc(.5rem + env(safe-area-inset-bottom,0px));-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-top:1px solid var(--border-light);background:#fffffff7;gap:.5rem;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -6px 16px -10px #0f172a59}.topic-mobile-nav-btn{border:1px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-subtle);min-width:0;color:var(--text-secondary);white-space:nowrap;cursor:pointer;flex:1 1 0;justify-content:center;align-items:center;gap:.4rem;padding:.65rem .5rem;font-family:inherit;font-size:.85rem;font-weight:600;text-decoration:none;transition:transform .1s;display:inline-flex;overflow:hidden}.topic-mobile-nav-btn span{text-overflow:ellipsis;overflow:hidden}.topic-mobile-nav-index{color:var(--accent-primary);background:var(--accent-light);border-color:var(--accent-border);flex:none}.topic-mobile-nav-btn.is-disabled{visibility:hidden}.topic-mobile-nav-btn:active{transform:scale(.98)}body:has(.topic-mobile-nav) .site-footer{padding-bottom:calc(5.5rem + env(safe-area-inset-bottom,0px))}.course-sidebar{display:none}}.lab3d-footer-links{flex-wrap:wrap;gap:.5rem;display:inline-flex}.lab3d-open-link{text-decoration:none}.lab3d-library-head{margin:2rem 0 1rem}.lab3d-library-title{color:var(--text-primary);margin:0 0 .75rem;font-size:1.25rem}.lab3d-search{border:1px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-primary);align-items:center;gap:.6rem;max-width:560px;padding:.6rem .85rem;display:flex}.lab3d-search i{color:var(--text-muted);font-size:.85rem}.lab3d-search input{width:100%;font:inherit;color:var(--text-primary);background:0 0;border:0;outline:0;font-size:.9rem}.lab3d-count{color:var(--text-muted);margin:.5rem 0 0;font-size:.8rem}.lab3d-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem;margin-top:1rem;display:grid}.lab3d-card{border:1px solid var(--border-light);border-radius:var(--radius-lg,12px);background:var(--bg-primary);flex-direction:column;transition:border-color .15s,box-shadow .15s,transform .15s;display:flex;overflow:hidden}.lab3d-card:hover{border-color:var(--accent-border);transform:translateY(-2px);box-shadow:0 10px 24px -14px #0284c773}.lab3d-card.active{border-color:var(--accent-primary);box-shadow:0 0 0 2px var(--accent-border)}.lab3d-card-mini{flex-direction:column;align-items:stretch}.lab3d-card-main{font:inherit;text-align:left;cursor:pointer;width:100%;color:inherit;background:0 0;border:0;flex-direction:column;flex:1;align-items:flex-start;gap:.45rem;padding:1.1rem 1.1rem 1rem;text-decoration:none;display:flex}.lab3d-card-icon{background:var(--accent-light);width:2.75rem;height:2.75rem;color:var(--accent-primary);border-radius:.8rem;justify-content:center;align-items:center;font-size:1.2rem;display:inline-flex}.lab3d-card-name{text-transform:uppercase;letter-spacing:.07em;color:var(--accent-primary);font-size:.7rem;font-weight:700}.lab3d-card-title{color:var(--text-primary);font-size:1.02rem;font-weight:700;line-height:1.4}.lab3d-card-foot{border-top:1px solid var(--border-light);background:var(--bg-subtle);justify-content:space-between;align-items:center;gap:.5rem;padding:.7rem 1.1rem;display:flex}.lab3d-card-open{color:var(--accent-primary);align-items:center;gap:.45rem;font-size:.87rem;font-weight:700;text-decoration:none;display:inline-flex}.lab3d-card-open i{font-size:.75rem;transition:transform .15s}.lab3d-card:hover .lab3d-card-open i{transform:translate(3px)}.lab3d-card-lesson{background:var(--bg-primary);border:1px solid var(--border-light);width:2rem;height:2rem;color:var(--text-muted);border-radius:50%;justify-content:center;align-items:center;font-size:.75rem;text-decoration:none;transition:all .15s;display:inline-flex}.lab3d-card-lesson:hover{background:var(--accent-light);border-color:var(--accent-border);color:var(--accent-primary)}.lab3d-empty{color:var(--text-muted);margin-top:1rem;font-size:.9rem}.lab3d-empty button{color:var(--accent-primary);font:inherit;cursor:pointer;background:0 0;border:0;font-weight:700}.model3d-page .m3d{margin-top:0}.model3d-section{margin-top:2rem}.model3d-section h2{color:var(--text-primary);margin:0 0 .75rem;font-size:1.2rem}.model3d-section p{color:var(--text-secondary);font-size:.95rem;line-height:1.7}.model3d-section p a,.model3d-steps a{color:var(--accent-primary);text-underline-offset:2px;text-decoration:underline}.model3d-section p a:visited,.model3d-steps a:visited{color:var(--accent-primary)}.model3d-section p a:hover,.model3d-steps a:hover{color:var(--accent-hover)}.model3d-includes{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.5rem;margin:0;padding:0;list-style:none;display:grid}.model3d-includes li{border:1px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-primary);color:var(--text-secondary);align-items:center;gap:.55rem;padding:.55rem .75rem;font-size:.85rem;display:flex}.model3d-includes li i{color:var(--accent-primary);font-size:.75rem}.model3d-steps{color:var(--text-secondary);gap:.6rem;margin:0;padding-left:1.25rem;font-size:.92rem;line-height:1.6;display:grid}.model3d-faq{border:1px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-primary);margin-bottom:.6rem;padding:.75rem 1rem}.model3d-faq summary{color:var(--text-primary);cursor:pointer;font-size:.9rem;font-weight:700}.model3d-faq p{margin:.5rem 0 0;font-size:.88rem}.model3d-related{border-top:1px solid var(--border-light);margin-top:2.5rem;padding-top:1.5rem}.model3d-related h2{margin:0 0 1rem;font-size:1.15rem}.lab3d-grid-mini .lab3d-card-mini{gap:.4rem;padding:1rem;text-decoration:none}.model3d-prevnext{flex-wrap:wrap;justify-content:space-between;gap:.75rem;margin-top:1.25rem;display:flex}.model3d-prevnext a{color:var(--accent-primary);font-size:.85rem;font-weight:600;text-decoration:none}.model3d-prevnext a:hover{text-decoration:underline}.graphic-placeholder{text-align:center;border-bottom:1px dashed var(--border-light);color:var(--text-secondary);background:repeating-linear-gradient(45deg,#f8fafc,#f8fafc 12px,#f1f5f9 12px 24px);padding:2rem 1.5rem}.graphic-placeholder i{color:var(--accent-primary);margin-bottom:.5rem;font-size:1.5rem}.graphic-placeholder code{background:var(--bg-subtle);border-radius:4px;padding:.1rem .35rem;font-size:.75rem}.table-wrap{border:1px solid var(--border-light);border-radius:var(--radius-lg);margin:1.25rem 0 1.75rem;overflow-x:auto}.topic-table{border-collapse:collapse;width:100%;font-size:.9rem;line-height:1.55}.topic-table th,.topic-table td{border-bottom:1px solid var(--border-light);text-align:left;vertical-align:top;padding:.7rem .9rem}.topic-table thead th{background:var(--bg-subtle);text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);font-size:.8rem}.topic-table tbody tr:last-child th,.topic-table tbody tr:last-child td{border-bottom:none}.stat-strip{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.75rem;margin:1.25rem 0 1.75rem;display:grid}.stat-chip{background:var(--bg-primary);border:1px solid var(--border-light);border-top:3px solid var(--accent-primary);border-radius:var(--radius-md);text-align:center;box-shadow:var(--shadow-sm);padding:.85rem .75rem}.stat-chip .stat-num{color:var(--accent-primary);font-size:1.3rem;font-weight:800;line-height:1.2;display:block}.stat-chip .stat-label{color:var(--text-muted);margin-top:.25rem;font-size:.75rem;line-height:1.4;display:block}.figure-duo{grid-template-columns:1fr 1fr;gap:1rem;margin:1.5rem 0 2rem;display:grid}.figure-duo .topic-figure{margin:0}@media (max-width:640px){.figure-duo{grid-template-columns:1fr}}.qa-list{flex-direction:column;gap:.85rem;margin:1.25rem 0 1.75rem;display:flex}.qa-item{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:.9rem 1.1rem}.qa-q{color:var(--text-primary);margin:0 0 .35rem;font-weight:700;line-height:1.5}.qa-q:before{content:"Q. ";color:var(--accent-primary)}.qa-a{color:var(--text-secondary);margin:0;font-size:.9rem;line-height:1.55}.qa-a:before{content:"A. ";color:var(--accent-primary);font-weight:700}.dash-wrap{flex-direction:column;gap:1.5rem;max-width:1080px;margin:0 auto;padding:2.5rem 1.5rem 4rem;display:flex}.dash-hero{background:linear-gradient(135deg, #0c4a6e 0%, var(--accent-primary) 60%, #38bdf8 130%);border-radius:var(--radius-lg);color:#fff;box-shadow:var(--shadow-lg);justify-content:space-between;align-items:center;gap:2rem;padding:2.25rem 2.5rem;display:flex;position:relative;overflow:hidden}.dash-hero:after{content:"";pointer-events:none;background:#ffffff14;border-radius:50%;width:280px;height:280px;position:absolute;top:-80px;right:-80px}.dash-kicker{text-transform:uppercase;letter-spacing:.08em;color:#bae6fd;align-items:center;gap:.45rem;margin-bottom:.5rem;font-size:.75rem;font-weight:700;display:inline-flex}.dash-hero h1{letter-spacing:-.025em;margin-bottom:.5rem;font-size:2.1rem;font-weight:800}.dash-sub{color:#e0f2fe;max-width:480px;margin-bottom:1.5rem;font-size:.95rem;line-height:1.6}.dash-hero-actions{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.dash-hero .btn-primary-action{color:#0c4a6e;background:#fff}.dash-hero .btn-primary-action:hover{background:#f0f9ff}.dash-reset{color:#fff;border-radius:var(--radius-md);cursor:pointer;background:0 0;border:1px solid #ffffff73;align-items:center;padding:.65rem 1.1rem;font-family:inherit;font-size:.85rem;font-weight:600;transition:background .15s;display:inline-flex}.dash-reset:hover{background:#ffffff26}.dash-hero-ring{flex:none;width:168px;height:168px;position:relative}.dash-hero-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.dash-ring-track{fill:none;stroke:#ffffff40;stroke-width:11px}.dash-ring-fill{fill:none;stroke:#fff;stroke-width:11px;stroke-linecap:round;stroke-dasharray:376.99;stroke-dashoffset:376.99px;transition:stroke-dashoffset .6s}.dash-ring-label{text-align:center;flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;top:0;bottom:0;left:0;right:0}.dash-ring-label strong{font-size:1.7rem;font-weight:800;line-height:1.1}.dash-ring-label span{color:#bae6fd;max-width:110px;font-size:.7rem;line-height:1.35}.dash-stats{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;display:grid}.dash-stat{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);align-items:center;gap:.9rem;padding:1.1rem 1.25rem;display:flex}.dash-stat-icon{border-radius:.85rem;flex:none;justify-content:center;align-items:center;width:2.75rem;height:2.75rem;font-size:1.15rem;display:inline-flex}.dash-stat-icon.is-done{color:#16a34a;background:#f0fdf4}.dash-stat-icon.is-streak{color:#ea580c;background:#fff7ed}.dash-stat-icon.is-series{background:var(--accent-light);color:var(--accent-primary)}.dash-stat-icon.is-active{color:#9333ea;background:#faf5ff}.dash-stat strong{color:var(--text-primary);font-size:1.3rem;font-weight:800;line-height:1.2;display:block}.dash-stat span{color:var(--text-muted);font-size:.78rem}.dash-continue{background:var(--bg-primary);border:1px solid var(--accent-border);border-left:4px solid var(--accent-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);align-items:center;gap:1.25rem;padding:1.25rem 1.5rem;display:flex}.dash-continue-icon{background:var(--accent-light);width:3rem;height:3rem;color:var(--accent-primary);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:1.25rem;display:inline-flex}.dash-continue-text{flex:1;min-width:0}.dash-continue-kicker{text-transform:uppercase;letter-spacing:.07em;color:var(--accent-primary);margin-bottom:.15rem;font-size:.72rem;font-weight:700}.dash-continue-text a{color:var(--text-primary);font-size:1.05rem;font-weight:700;line-height:1.4;text-decoration:none}.dash-continue-text a:hover{color:var(--accent-primary)}.dash-continue-text p{color:var(--text-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-top:.2rem;font-size:.85rem;line-height:1.5;display:-webkit-box;overflow:hidden}.dash-continue .btn-primary-action{white-space:nowrap;flex:none}.dash-filter{top:var(--header-height);z-index:50;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);background:#ffffffeb;gap:.5rem;padding:.75rem;display:flex;position:sticky;overflow-x:auto}.dash-tab{min-width:max-content;color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;white-space:nowrap;background:0 0;border:1px solid #0000;flex:1 1 0;padding:.55rem 1rem;font-family:inherit;font-size:.85rem;font-weight:600;transition:all .15s}.dash-tab:hover{background:var(--bg-subtle);color:var(--text-primary)}.dash-tab.is-active{background:var(--accent-primary);color:#fff;box-shadow:0 4px 10px -4px #0284c799}.dash-tab-count{opacity:.75;font-size:.78rem;font-weight:700}.dash-empty{text-align:center;background:var(--bg-primary);border:1px dashed var(--border-subtle);border-radius:var(--radius-lg);color:var(--text-secondary);flex-direction:column;align-items:center;gap:.75rem;padding:2.5rem 1.5rem;font-size:.92rem;display:flex}.dash-empty-icon{background:var(--bg-subtle);width:3rem;height:3rem;color:var(--text-faint);border-radius:50%;justify-content:center;align-items:center;font-size:1.25rem;display:inline-flex}.dash-module[hidden],.dash-series[hidden],.dash-empty[hidden]{display:none}.dash-modules{flex-direction:column;gap:1.25rem;display:flex}.dash-module{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:1.5rem 1.5rem 1.25rem}.dash-module-head{justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:.85rem;display:flex}.dash-module-head h3{letter-spacing:-.01em;color:var(--text-primary);margin-bottom:.25rem;font-size:1.15rem;font-weight:800}.dash-module-head p{color:var(--text-muted);max-width:640px;font-size:.85rem;line-height:1.55}.dash-module-count{color:var(--accent-primary);background:var(--accent-light);border:1px solid var(--accent-border);white-space:nowrap;border-radius:999px;flex:none;padding:.25rem .7rem;font-size:.78rem;font-weight:700}.dash-bar{background:var(--bg-elevated);border-radius:999px;height:8px;margin-bottom:1.25rem;overflow:hidden}.dash-bar-fill{background:linear-gradient(90deg, var(--accent-primary), #38bdf8);border-radius:999px;height:100%;transition:width .6s;display:block}.dash-series{border-top:1px solid var(--border-light);padding:1rem 0 .25rem}.dash-series-head{justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:.5rem;display:flex}.dash-series-head h4{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);font-size:.85rem;font-weight:700}.dash-series-count{color:var(--text-faint);white-space:nowrap;font-size:.75rem;font-weight:600}.dash-lessons{flex-direction:column;list-style:none;display:flex}.dash-lesson{border-radius:var(--radius-md);align-items:center;gap:.75rem;padding:.55rem .6rem;text-decoration:none;transition:background .15s;display:flex}.dash-lesson:hover{background:var(--bg-subtle)}.dash-dot{border:2px solid var(--border-subtle);color:#0000;border-radius:50%;flex:none;justify-content:center;align-items:center;width:1.4rem;height:1.4rem;font-size:.6rem;transition:all .15s;display:inline-flex}.dash-lesson.is-done .dash-dot{color:#fff;background:#16a34a;border-color:#16a34a}.dash-lesson.is-started .dash-dot{border-color:var(--accent-primary);background:var(--accent-light)}.dash-lesson.is-started .dash-lesson-done-at{color:var(--accent-primary)}.dash-lessons li[hidden]{display:none}.dash-lesson-title{min-width:0;color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:.92rem;font-weight:500;overflow:hidden}.dash-lesson:hover .dash-lesson-title{color:var(--accent-primary)}.dash-lesson.is-done .dash-lesson-title{color:var(--text-muted)}.dash-lesson-meta{color:var(--text-faint);flex:none;font-size:.75rem}.dash-lesson-done-at{color:#16a34a;flex:none;font-size:.72rem;font-weight:600}.dash-module.is-complete{border-color:#bbf7d0}.dash-footnote{color:var(--text-faint);text-align:center;justify-content:center;align-items:center;gap:.45rem;font-size:.8rem;display:flex}@media (max-width:768px){.dash-wrap{padding:1.5rem 1rem 4rem}.dash-hero{text-align:center;flex-direction:column;padding:2rem 1.5rem}.dash-sub{margin-left:auto;margin-right:auto}.dash-hero-actions{justify-content:center}.dash-continue{flex-wrap:wrap}.dash-continue .btn-primary-action{justify-content:center;width:100%}.dash-lesson-title{white-space:normal}}