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block}.scroll-progress-bar{background:var(--accent);transform-origin:0;width:100%;height:100%;animation:linear both scroll-progress;animation-timeline:--article}.prose{color:var(--prose-body);max-width:78ch;font-size:.9375rem;line-height:1.8}.prose>*+*{margin-top:1.25em}.callout-body>*+*{margin-top:.75em}.prose h1,.prose h2,.prose h3,.prose h4{letter-spacing:-.01em;font-weight:600;line-height:1.3}.prose h2{color:var(--prose-h2);letter-spacing:-.01em;border-bottom:none;border-left:none;margin-top:0;margin-bottom:.875rem;padding-bottom:0;padding-left:0;font-size:1.4rem}.prose *+h2{border-top:1px solid var(--border);margin-top:4.5rem;padding-top:1.5rem}.prose h3{color:var(--prose-h3);margin-top:2rem;margin-bottom:.5rem;font-size:1.05rem;font-weight:600}.prose h4{color:var(--prose-h4);text-transform:uppercase;letter-spacing:.07em;margin-top:1.5rem;margin-bottom:.375rem;font-size:.8rem;font-weight:600}.prose p{color:var(--prose-body);max-width:78ch}.prose strong{color:var(--text-primary);font-weight:500}.prose a{color:var(--text-primary);text-decoration:underline;-webkit-text-decoration-color:var(--border-strong);-webkit-text-decoration-color:var(--border-strong);-webkit-text-decoration-color:var(--border-strong);text-decoration-color:var(--border-strong);text-underline-offset:3px;transition:text-decoration-color .15s}.prose a:hover{-webkit-text-decoration-color:var(--text-primary);-webkit-text-decoration-color:var(--text-primary);-webkit-text-decoration-color:var(--text-primary);text-decoration-color:var(--text-primary)}.prose ul{padding-left:1.5rem;list-style-type:disc}.prose ol{padding-left:1.5rem;list-style-type:decimal}.prose ul ul{list-style-type:circle}.prose li{color:var(--text-secondary);display:list-item}.prose li+li{margin-top:.3rem}.prose li::marker{color:var(--text-tertiary)}.prose blockquote{border-left:2px solid var(--border-strong);color:var(--text-secondary);padding-left:1.25rem;font-style:italic}.prose code{background:var(--bg-elevated);border:1px solid var(--border-strong);color:var(--text-primary);border-radius:3px;padding:2px 5px;font-family:IBM Plex Mono,ui-monospace,monospace;font-size:.8125em}.prose table{border-collapse:collapse;width:100%;font-size:.875rem}.prose th{text-align:left;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.06em;border-bottom:1px solid var(--border);padding:.625rem 1rem;font-size:.75rem;font-weight:500}.prose td{border-bottom:1px solid var(--border);color:var(--text-secondary);vertical-align:top;padding:.625rem 1rem}.prose tr:last-child td{border-bottom:none}.prose hr{border:none;border-top:1px solid var(--border);margin:2.5rem 0}.prose h2 .anchor-link,.prose h3 .anchor-link{opacity:0;color:var(--text-tertiary);margin-left:.5rem;font-size:.875em;text-decoration:none;transition:opacity .15s}.prose h2:hover .anchor-link,.prose h3:hover .anchor-link{opacity:1}.page-container{padding-left:32px;padding-right:32px}.sidebar{top:var(--nav-height);width:var(--panel-width);height:calc(100vh - var(--nav-height));flex-shrink:0;transition:transform .26s cubic-bezier(.4,0,.2,1);position:sticky}.toc-rail{display:block}.sidebar-toggle,.sidebar-overlay{display:none}.problem-grid-header,.problem-grid-row{grid-template-columns:32px 1fr 140px 80px 90px;align-items:center;gap:0 16px;display:grid}@media (max-width:1100px){.toc-rail{display:none}}@media (max-width:900px){:root{--panel-width:240px}.problem-grid-header,.problem-grid-row{grid-template-columns:1fr 80px!important}.col-num,.col-cat,.col-date{display:none!important}}@media (max-width:768px){.sidebar{top:var(--nav-height);height:calc(100vh - var(--nav-height));z-index:40;box-shadow:none;position:fixed;left:0;transform:translate(-100%);width:82vw!important;max-width:320px!important}.sidebar.open{transform:translate(0);box-shadow:4px 0 24px #0006}.sidebar-toggle{background:var(--bg-elevated);border:1px solid var(--border-strong);width:44px;height:44px;color:var(--text-primary);cursor:pointer;z-index:45;border-radius:12px;justify-content:center;align-items:center;transition:background .15s;display:flex;position:fixed;bottom:24px;left:20px;box-shadow:0 4px 16px #0000004d}.sidebar-toggle:hover{background:var(--bg-hover)}.sidebar-overlay{inset:0;top:var(--nav-height);z-index:39;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#00000080;display:block;position:fixed}.problem-grid-header{display:none}.problem-grid-row{padding:14px 0;grid-template-columns:1fr auto!important}.col-num,.col-cat,.col-date{display:none!important}.prose h2{font-size:1.15rem}.prose h3{font-size:1rem}.prose *+h2{margin-top:3rem}.page-container{padding-left:20px;padding-right:20px}}@media (max-width:480px){.page-container{padding-left:16px;padding-right:16px}}.prose .table-wrapper{margin:var(--space-6) 0;position:relative;overflow-x:auto}.prose .table-wrapper:after{content:"";background:linear-gradient(to right, transparent, var(--bg-base));pointer-events:none;opacity:0;width:40px;transition:opacity .15s;position:absolute;top:0;bottom:0;right:0}.prose .table-wrapper.overflowing:after{opacity:1}@media (max-width:640px){.filter-bar-row{-webkit-overflow-scrolling:touch;scrollbar-width:none;padding-bottom:4px;overflow-x:auto;flex-wrap:nowrap!important}.filter-bar-row::-webkit-scrollbar{display:none}.branding-grid-2,.branding-grid-3{grid-template-columns:1fr!important}.branding-grid-5,.branding-grid-4{grid-template-columns:repeat(2,1fr)!important}}@media (max-width:768px){.article-content{padding:24px 20px 64px!important}}.featured-grid{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}@media (max-width:860px){.featured-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:560px){.featured-grid{grid-template-columns:1fr}}.problem-nav-wrapper{padding-top:var(--space-10);margin-top:var(--space-10);border-top:1px solid var(--border);justify-content:space-between;gap:12px;display:flex}.problem-nav-card{flex:1;max-width:48%}@media (max-width:560px){.problem-nav-wrapper{flex-direction:column}.problem-nav-card{max-width:100%}}@media (max-width:400px){.nudge-toast-right{max-width:none!important;left:12px!important;right:12px!important}}details{border:1px solid var(--border-strong);background:var(--bg-elevated);border-radius:8px;margin:2rem 0;overflow:hidden}details summary{cursor:pointer;-webkit-user-select:none;user-select:none;color:var(--text-secondary);font-size:.875rem;font-family:var(--font-family-sans);align-items:center;gap:10px;padding:13px 16px;list-style:none;transition:background .12s;display:flex}details summary::-webkit-details-marker{display:none}details summary::marker{display:none}details summary:before{content:"›";color:var(--text-tertiary);text-align:center;flex-shrink:0;width:14px;font-size:1.1rem;line-height:1;transition:transform .15s;display:inline-block}details[open] summary:before{transform:rotate(90deg)}details summary:after{content:"Senior";font-size:10px;font-family:var(--font-family-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--accent-focus);background:#5b8dee14;border:1px solid #5b8dee38;border-radius:4px;flex-shrink:0;margin-left:auto;padding:3px 7px;font-weight:500}details summary:hover{background:var(--bg-hover);color:var(--text-primary)}details summary:hover:before{color:var(--text-secondary)}details[open] summary{border-bottom:1px solid var(--border);color:var(--text-primary)}details>:not(summary){padding:4px 18px 20px}details>:not(summary) h4,details>:not(summary) h5{color:var(--text-primary);margin:1.25rem 0 .4rem;font-size:.9rem;font-weight:600}.shiki-block code{font-family:IBM Plex Mono,monospace;font-size:inherit;white-space:pre;background:0 0;border:none;border-radius:0;padding:0}[data-theme=light] .code-block-wrapper{background:#fff!important}[data-theme=light] .code-block-header{background:#f3f3f3!important;border-bottom-color:#e0e0e0!important}[data-theme=dark] .shiki-block span{color:var(--shiki-dark)!important;font-style:var(--shiki-dark-font-style)!important;font-weight:var(--shiki-dark-font-weight)!important;-webkit-text-decoration:var(--shiki-dark-text-decoration)!important;-webkit-text-decoration:var(--shiki-dark-text-decoration)!important;-webkit-text-decoration:var(--shiki-dark-text-decoration)!important;text-decoration:var(--shiki-dark-text-decoration)!important}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@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-ease{syntax:"*";inherits:false}