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var(--color-border);margin-bottom:8px;padding:0 24px 20px}.lesson-sidebar-back{color:var(--color-text-muted);align-items:center;gap:6px;margin-bottom:14px;font-size:13px;text-decoration:none;transition:color .15s;display:inline-flex}.lesson-sidebar-back:hover{color:var(--color-text)}.lesson-sidebar-course-title{color:var(--color-text);margin:0;font-size:15px;font-weight:600;line-height:1.4}.lesson-sidebar-chapter{margin-bottom:6px;padding:0 16px}.lesson-sidebar-chapter-title{color:var(--color-text-muted);letter-spacing:.04em;margin:0;padding:12px 8px 6px;font-size:12px;font-weight:600}.lesson-sidebar-item{color:var(--color-text-secondary);border-radius:8px;align-items:center;gap:10px;padding:9px 10px;font-size:13px;line-height:1.45;text-decoration:none;transition:background .15s,color .15s;display:flex}.lesson-sidebar-item:hover{background:var(--color-primary-soft);color:var(--color-text)}.lesson-sidebar-item--active{background:var(--color-primary-soft);color:var(--color-primary);font-weight:500}.lesson-sidebar-item--locked{cursor:default;opacity:.45}a.lesson-sidebar-item--locked{cursor:pointer}.lesson-sidebar-item-icon{flex:none;width:16px;height:16px}.lesson-sidebar-item-text{flex:1;min-width:0}.lesson-sidebar-item-badge{background:var(--color-primary-soft);color:var(--color-text-muted);border-radius:4px;margin-top:4px;padding:2px 6px;font-size:10px;font-weight:500;line-height:1.4;display:inline-block}.lesson-mobile-header{display:none}.lesson-content{box-sizing:border-box;flex:1;min-width:0;max-width:800px;min-height:min-content;margin:0 auto;padding:40px 48px 48px}.lesson-breadcrumb{color:var(--color-text-muted);flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:24px;font-size:13px;display:flex}.lesson-breadcrumb a{color:var(--color-text-muted);text-decoration:none;transition:color .15s}.lesson-breadcrumb a:hover{color:var(--color-text)}.lesson-breadcrumb-sep{color:var(--color-border)}.lesson-article-title{color:var(--color-text);font-family:var(--font-serif);letter-spacing:0;margin:0 0 12px;font-size:32px;font-style:italic;font-weight:400;line-height:1.3}.lesson-reading-time{color:var(--color-text-muted);margin:0 0 32px;font-size:13px}.blog-article-content{color:var(--color-text);font-size:16px;line-height:1.75}.lesson-content .blog-article-content{letter-spacing:0;font-size:16.5px;line-height:1.8}.blog-article-content p{margin:0 0 16px}.lesson-content .blog-article-content p{margin:0 0 26px}.blog-article-content h2{color:var(--color-text);margin:48px 0 16px;font-size:22px;font-weight:600}.lesson-content .blog-article-content h2{border-top:1px solid var(--color-border);margin:56px 0 18px;padding-top:32px;font-size:23px;font-weight:700}.blog-article-content ol,.blog-article-content ul{margin:0 0 16px;padding-left:24px}.blog-article-content li{margin-bottom:6px}.blog-article-content blockquote{border-left:3px solid var(--color-accent);background:var(--color-accent-soft);color:var(--color-text-secondary);border-radius:0 8px 8px 0;margin:24px 0;padding:16px 20px;font-style:italic}.blog-article-content blockquote p{margin:0}.blog-article-content cite{color:var(--color-text-muted);margin-top:8px;font-size:13px;font-style:normal;display:block}.lesson-lead{color:var(--color-text-secondary);font-size:17px}.lesson-callout{color:var(--color-text);border-radius:12px;margin:24px 0;padding:16px 18px;font-size:14px;line-height:1.7}.lesson-callout--info{border:1px solid var(--color-accent)}@supports (color:color-mix(in lab,red,red)){.lesson-callout--info{border:1px solid color-mix(in srgb,var(--color-accent)35%,transparent)}}.lesson-callout--info{background:var(--color-accent-soft)}.lesson-callout--warn{background:#ef444414;border:1px solid #ef444447}.lesson-upsell{border:1px solid var(--color-border);background:var(--color-surface);text-align:center;border-radius:16px;justify-items:center;margin-top:44px;padding:28px 20px;display:grid}.lesson-upsell-icon{color:var(--color-accent)}.lesson-upsell-text{max-width:420px;color:var(--color-text-secondary);margin:12px 0 18px;font-size:14px;line-height:1.7}.lesson-upsell-cta{background:var(--color-primary);color:var(--color-bg);border-radius:12px;padding:10px 18px;font-size:14px;font-weight:500;text-decoration:none;display:inline-flex}.lesson-nav{border-top:1px solid var(--color-border);justify-content:space-between;gap:16px;margin-top:56px;padding-top:24px;display:flex}.lesson-nav-link{max-width:48%;color:var(--color-text);border-radius:12px;padding:12px 14px;text-decoration:none;transition:background .15s}.lesson-nav-link:hover{background:var(--color-primary-soft)}.lesson-nav-link span{color:var(--color-text-muted);margin-bottom:4px;font-size:12px;display:block}.lesson-nav-link strong{font-size:14px;font-weight:500;line-height:1.45}.lesson-nav-link--next{text-align:right}@media (max-width:768px){.course-detail{padding:0 16px 100px}.course-detail-hero{margin-bottom:28px;padding:36px 0 28px}.course-detail-title{font-size:26px}.course-detail-subtitle{margin-bottom:16px;font-size:15px}.course-detail-meta{flex-wrap:wrap;gap:8px;font-size:12px}.course-info-section{margin-bottom:28px}.course-info-item{font-size:14px}.course-instructor{text-align:center;flex-direction:column;align-items:center;padding:20px}.course-instructor-avatar{width:48px;height:48px}.course-chapter-title{font-size:14px}.course-lesson-row{padding:8px 10px;font-size:13px}.course-plan-row{flex-direction:column;align-items:flex-start}.lesson-layout{height:auto;display:block;overflow:visible}.lesson-sidebar-wrapper{display:none}.lesson-skin .lesson-layout>.lesson-sidebar-wrapper{display:none!important}.lesson-mobile-header{z-index:50;border-bottom:1px solid var(--color-border);background:var(--color-bg);align-items:center;gap:12px;padding:10px 56px 10px 16px;display:flex;position:sticky;top:0}.lesson-skin .lesson-mobile-header{display:flex!important}.lesson-mobile-menu-btn{border:1px solid var(--color-border);width:36px;height:36px;color:var(--color-text-secondary);background:0 0;border-radius:8px;flex:none;justify-content:center;align-items:center;display:flex}.lesson-mobile-title{color:var(--color-text);text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:500;overflow:hidden}.lesson-content{max-width:100%;height:auto;padding:24px 20px 48px;overflow-y:visible}.lesson-breadcrumb{display:none}.lesson-article-title{margin-bottom:8px;font-size:24px}.lesson-reading-time{margin-bottom:24px}.lesson-nav{flex-direction:column}.lesson-nav-link{max-width:100%}.lesson-nav-link--next{text-align:left}.lesson-content .blog-article-content{font-size:15.5px;line-height:1.75}.lesson-content .blog-article-content h2{margin:40px 0 14px;padding-top:24px;font-size:20px}.lesson-content .blog-article-content p{margin-bottom:22px}}@media (max-width:480px){.course-detail-title{font-size:23px}.course-detail-subtitle{font-size:14px}.lesson-mobile-header{gap:10px;padding:8px 52px 8px 12px}.lesson-mobile-title{font-size:13px}.lesson-article-title{font-size:22px}}.course-welcome-banner{color:#15803d;text-align:center;background:#16a34a14;border:1px solid #16a34a;border-radius:12px;margin:0 0 20px;padding:12px 18px;font-size:14px;font-weight:600}.course-plan-row-right{flex-direction:column;flex:none;align-items:flex-end;gap:10px;display:flex}.course-plan-row-right strong{color:var(--color-text);font-size:22px}.course-plan-row-right strong span{color:var(--color-text-muted);font-size:13px;text-decoration:line-through}.course-plan-buy{background:var(--color-primary);color:var(--color-bg);white-space:nowrap;cursor:pointer;border:none;border-radius:9999px;justify-content:center;align-items:center;padding:10px 22px;font-size:14px;font-weight:600;transition:opacity .15s;display:inline-flex}.course-plan-buy:hover{opacity:.88}.course-plan-buy:disabled{opacity:.6;cursor:default}.course-buy-error{color:#dc2626;text-align:right;margin:6px 0 0;font-size:12px}.course-plan-restore{color:var(--color-text-secondary);margin:16px 0 0;font-size:13px}.course-plan-restore a{color:var(--color-primary);font-weight:600;text-decoration:none}.course-plan-restore a:hover{text-decoration:underline}.course-detail-cta{flex-wrap:wrap;align-items:center;gap:16px;margin-top:24px;display:flex}.course-detail-cta-btn{padding:12px 30px;font-size:15px}.course-detail-cta-login{color:var(--color-text-secondary);text-underline-offset:3px;font-size:13px;text-decoration:underline}.course-detail-cta-login:hover{color:var(--color-text)}.course-plan-view{text-decoration:none}.lesson-upsell-login{color:var(--color-text-secondary);text-underline-offset:3px;margin-top:12px;font-size:13px;text-decoration:underline}.lesson-upsell-login:hover{color:var(--color-text)}.course-login-page{justify-content:center;padding:64px 20px 96px;display:flex}.course-login-card{border:1px solid var(--color-border);background:var(--color-surface);border-radius:18px;width:100%;max-width:420px;padding:36px 28px}.course-login-title{color:var(--color-text);margin:0;font-size:22px}.course-login-subtitle{color:var(--color-text-secondary);margin:12px 0 24px;font-size:14px;line-height:1.7}.course-login-form{gap:12px;display:grid}.course-login-input{border:1px solid var(--color-border);background:var(--color-bg);width:100%;color:var(--color-text);border-radius:12px;padding:12px 14px;font-size:14px}.course-login-input:focus{border-color:var(--color-primary);outline:none}.course-login-submit{background:var(--color-primary);color:var(--color-bg);cursor:pointer;border:none;border-radius:9999px;padding:12px 20px;font-size:14px;font-weight:600;transition:opacity .15s}.course-login-submit:hover{opacity:.88}.course-login-submit:disabled{opacity:.6;cursor:default}.course-login-message{margin:4px 0 0;font-size:13px;line-height:1.6}.course-login-message--ok{color:#16a34a}.course-login-message--error{color:#dc2626}.mindmap{border:1px solid var(--color-border);background:linear-gradient(180deg,var(--color-surface),var(--color-bg));border-radius:18px;flex-direction:column;gap:14px;margin:28px 0;padding:22px;display:flex}.mindmap-root{background:var(--color-primary);color:var(--color-bg);border-radius:14px;flex-wrap:wrap;align-items:baseline;gap:10px;padding:14px 20px;display:flex;box-shadow:0 8px 22px #0000001f}.mindmap-root-title{font-size:18px;font-weight:700;line-height:1.3}.mindmap-root-meta{opacity:.85;font-size:13px}.mindmap-branches{gap:12px;display:grid}.mindmap-branch{border:1px solid var(--color-border);border-left:3px solid var(--color-primary);background:var(--color-bg);border-radius:12px;flex-direction:column;gap:10px;padding:14px 16px;display:flex}.mindmap-node{align-items:center;gap:9px;display:flex}.mindmap-node-index{color:var(--color-primary);font-size:13px;font-weight:700}.mindmap-node-title{color:var(--color-text);font-size:15px;font-weight:700}.mindmap-node-count{color:var(--color-text-muted);white-space:nowrap;margin-left:auto;font-size:11px}.mindmap-outcome{background:var(--color-accent-soft);color:var(--color-text-secondary);border-radius:10px;align-items:flex-start;gap:8px;margin:0;padding:9px 12px;font-size:13px;line-height:1.55;display:flex}.mindmap-outcome strong{color:var(--color-text);font-weight:700}.mindmap-outcome-icon{color:var(--color-accent);flex:none;margin-top:2px}.mindmap .mindmap-leaves{flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none;display:flex}.mindmap .mindmap-leaf{border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text-secondary);border-radius:9999px;align-items:center;gap:5px;margin:0;padding:5px 10px;font-size:12px;transition:transform .12s,box-shadow .12s;display:inline-flex}.mindmap-leaf:hover{transform:translateY(-1px);box-shadow:0 4px 12px #00000014}.mindmap-leaf-icon{flex:none}.mindmap .mindmap-leaf--free{color:#15803d;border-color:#16a34a}.mindmap .mindmap-leaf--free .mindmap-leaf-icon{color:#16a34a}.mindmap .mindmap-leaf--unlocked{color:#a16207;background:#fef9c3;border-color:#eab308}.mindmap .mindmap-leaf--unlocked .mindmap-leaf-icon{color:#ca8a04}.mindmap .mindmap-leaf--paid .mindmap-leaf-icon{color:var(--color-primary)}.mindmap .mindmap-leaf--coming-soon{opacity:.55}@media (max-width:760px){.mindmap{padding:16px}.mindmap-root-title{font-size:16px}}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-space-x-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-gradient-position{syntax:"*";inherits:false}@property --tw-gradient-from{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-via{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-to{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-stops{syntax:"*";inherits:false}@property --tw-gradient-via-stops{syntax:"*";inherits:false}@property --tw-gradient-from-position{syntax:"<length-percentage>";inherits:false;initial-value:0}@property --tw-gradient-via-position{syntax:"<length-percentage>";inherits:false;initial-value:50%}@property --tw-gradient-to-position{syntax:"<length-percentage>";inherits:false;initial-value:100%}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-duration{syntax:"*";inherits:false}@property --tw-scale-x{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-y{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-z{syntax:"*";inherits:false;initial-value:1}