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var(--border);background:var(--surface);color:var(--muted-foreground);letter-spacing:.02em;border-radius:99px;padding:4px 9px;font-size:10px;font-weight:650}.article-labels .difficulty{border-color:var(--success)}@supports (color:color-mix(in lab, red, red)){.article-labels .difficulty{border-color:color-mix(in srgb, var(--success) 32%, var(--border))}}.article-labels .difficulty{background:var(--success-soft);color:var(--success)}.article-hero h1{letter-spacing:-.065em;max-width:760px;margin:0;font-size:clamp(40px,5.6vw,70px);line-height:.98}.article-hero>p{max-width:720px;color:var(--muted-foreground);letter-spacing:-.012em;margin:24px 0 0;font-size:18px;line-height:1.7}.hero-actions{align-items:center;gap:18px;margin-top:26px;display:flex}.complete-button{border:1px solid var(--border-strong);background:var(--surface);min-height:44px;color:var(--foreground);border-radius:9px;align-items:center;gap:8px;padding:0 14px;font-size:12px;font-weight:650;transition:background .18s,border-color .18s,color .18s;display:inline-flex}.complete-button:hover{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-strong)}.complete-button.is-complete{border-color:var(--success)}@supports (color:color-mix(in lab, red, red)){.complete-button.is-complete{border-color:color-mix(in srgb, var(--success) 45%, transparent)}}.complete-button.is-complete{background:var(--success-soft);color:var(--success)}.article-version{color:var(--subtle-foreground);font-size:11px}.mobile-toc{display:none}.article-section{border-bottom:1px solid var(--border);grid-template-columns:42px minmax(0,1fr);gap:26px;padding:64px 0;display:grid}.section-number{color:var(--subtle-foreground);font:600 10px/1 var(--font-geist-mono), monospace;padding-top:5px}.section-kicker{color:var(--accent-strong);font:700 10px/1.2 var(--font-geist-mono), monospace;letter-spacing:.12em;margin-bottom:8px;display:block}.article-section h2{letter-spacing:-.045em;margin:0 0 20px;font-size:clamp(27px,3.2vw,38px);line-height:1.12}.article-section>div>p{max-width:720px;color:var(--muted-foreground);margin:0;font-size:16px;line-height:1.82}.key-idea{border:1px solid var(--accent);grid-template-columns:22px minmax(0,1fr);gap:13px;margin-top:28px;display:grid}@supports (color:color-mix(in lab, red, red)){.key-idea{border:1px solid color-mix(in srgb, var(--accent) 24%, var(--border))}}.key-idea{background:var(--accent-soft);border-radius:12px;padding:18px 20px}.key-idea>svg{color:var(--accent-strong);margin-top:2px}.key-idea strong{margin-bottom:4px;font-size:12px;display:block}.key-idea p{color:var(--muted-foreground);margin:0;font-size:13px;line-height:1.6}.visualizer-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow-md);border-radius:14px;overflow:hidden}.visualizer-toolbar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-start;gap:20px;padding:20px;display:flex}.visualizer-toolbar h3{letter-spacing:-.025em;margin:3px 0 0;font-size:17px}.target-control{color:var(--muted-foreground);align-items:center;gap:9px;font-size:11px;display:flex}.target-control select{border:1px solid var(--border-strong);background:var(--surface);min-width:68px;min-height:40px;color:var(--foreground);font:650 12px/1 var(--font-geist-mono), monospace;border-radius:8px;padding:0 10px}.array-track{grid-template-columns:repeat(9,minmax(38px,1fr));gap:7px;padding:42px 22px 20px;display:grid}.array-cell{aspect-ratio:1;border:1px solid var(--border-strong);background:var(--surface-soft);min-width:0;color:var(--foreground);font:650 13px/1 var(--font-geist-mono), monospace;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;display:flex}.array-cell small{color:var(--subtle-foreground);margin-top:5px;font-size:8px}.array-cell.is-mid{border-color:var(--accent);background:var(--accent);color:#fff;box-shadow:0 8px 20px var(--accent)}@supports (color:color-mix(in lab, red, red)){.array-cell.is-mid{box-shadow:0 8px 20px color-mix(in srgb, var(--accent) 28%, transparent)}}.array-cell.is-mid small{color:#ffffffb8}.array-cell.is-found{border-color:var(--success);background:var(--success)}.range-labels{color:var(--subtle-foreground);font:500 9px/1 var(--font-geist-mono), monospace;justify-content:space-between;gap:10px;padding:0 22px 18px;display:flex}.step-message{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface-soft);min-height:60px;color:var(--muted-foreground);align-items:center;gap:10px;padding:13px 20px;font-size:12px;line-height:1.5;display:flex}.step-message svg{color:var(--accent-strong);flex:none}.step-message.is-success{background:var(--success-soft);color:var(--success)}.step-message.is-success svg{color:var(--success)}.visualizer-actions{justify-content:center;align-items:center;gap:8px;padding:14px;display:flex}.visualizer-actions button{border-radius:8px;justify-content:center;align-items:center;gap:7px;min-height:42px;padding:0 12px;font-size:11px;font-weight:650;transition:background .18s,border-color .18s,opacity .18s;display:inline-flex}.visualizer-actions button:disabled{opacity:.38}.icon-text-button,.reset-button{border:1px solid var(--border);background:var(--surface);color:var(--muted-foreground)}.icon-text-button:hover:not(:disabled),.reset-button:hover{border-color:var(--border-strong);background:var(--surface-soft);color:var(--foreground)}.primary-action{border:1px solid var(--accent);background:var(--accent);color:#fff}.primary-action:hover{background:var(--accent-strong)}.reset-button{width:42px;padding:0!important}.strategy-grid{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.strategy-step{border:1px solid var(--border);background:var(--surface);min-height:156px;box-shadow:var(--shadow-sm);border-radius:12px;padding:18px}.strategy-step>span{color:var(--accent-strong);font:700 10px/1 var(--font-geist-mono), monospace}.strategy-step p{color:var(--muted-foreground);margin:36px 0 0;font-size:13px;line-height:1.55}.complexity-grid{border:1px solid var(--border);background:var(--surface);border-radius:12px;grid-template-columns:repeat(4,1fr);display:grid;overflow:hidden}.complexity-grid>div{border-right:1px solid var(--border);flex-direction:column;justify-content:space-between;min-height:112px;padding:16px;display:flex}.complexity-grid>div:last-child{border-right:0}.complexity-grid span{color:var(--muted-foreground);font-size:10px}.complexity-grid strong{color:var(--accent-strong);font:650 13px/1.35 var(--font-geist-mono), monospace}.article-section .analysis-note{color:var(--subtle-foreground);margin-top:18px;font-size:11px;line-height:1.6}.code-panel{border:1px solid var(--code-border);background:var(--code-bg);box-shadow:var(--shadow-md);border-radius:12px;overflow:hidden}.code-toolbar{border-bottom:1px solid var(--code-border);justify-content:space-between;align-items:center;gap:16px;min-height:52px;padding:0 12px;display:flex}.language-tabs{align-items:center;gap:3px;display:flex}.language-tabs button,.copy-button{color:#8090aa;background:0 0;border:0;border-radius:7px;min-height:36px;padding:0 10px;font-size:10px;transition:background .18s,color .18s}.language-tabs button:hover,.copy-button:hover{color:#dbeafe;background:#172237}.language-tabs button.is-active{color:#fff;background:#1d2c46}.copy-button{align-items:center;gap:6px;display:inline-flex}.code-panel pre{color:var(--code-text);scrollbar-color:#3b4d68 transparent;margin:0;padding:24px;overflow-x:auto}.code-panel code{font:500 12px/1.85 var(--font-geist-mono), monospace;white-space:pre}.pitfall-list{gap:9px;display:grid}.pitfall-list>div{border:1px solid var(--border);background:var(--surface);border-radius:10px;grid-template-columns:38px minmax(0,1fr);align-items:center;gap:14px;padding:14px 16px;display:grid}.pitfall-list span{color:var(--warning);font:700 10px/1 var(--font-geist-mono), monospace}.pitfall-list p{color:var(--muted-foreground);margin:0;font-size:13px}.source-section{border-bottom:0}.source-guide{max-width:760px;margin-bottom:24px}.source-guide>p{max-width:720px;color:var(--muted-foreground);margin:0 0 18px;font-size:14px;line-height:1.7}.source-lenses{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.source-lenses>div{border:1px solid var(--border);background:var(--surface);min-height:180px;box-shadow:var(--shadow-sm);border-radius:12px;flex-direction:column;padding:18px;display:flex}.source-lenses span{color:var(--accent-strong);font:700 9px/1 var(--font-geist-mono), monospace;letter-spacing:.08em}.source-lenses strong{margin-top:28px;font-size:16px}.source-lenses p{color:var(--muted-foreground);margin:9px 0 0;font-size:12px;line-height:1.6}.source-takeaway{border-left:3px solid var(--accent);background:var(--accent-soft);color:var(--accent-strong);grid-template-columns:22px minmax(0,1fr);gap:10px;margin-top:12px;padding:14px 16px;display:grid}.source-takeaway p{color:var(--foreground);margin:0;font-size:12px;font-weight:600;line-height:1.6}.source-list{gap:10px;max-width:760px;display:grid}.source-list a{border:1px solid var(--border);background:var(--surface);min-height:86px;color:var(--foreground);border-radius:10px;grid-template-columns:22px minmax(0,1fr) 18px;align-items:center;gap:12px;padding:12px 15px;font-size:12px;font-weight:600;text-decoration:none;transition:border-color .18s,background .18s;display:grid}.source-list a:hover{border-color:var(--accent);background:var(--accent-soft)}.source-list a:focus-visible{outline:3px solid var(--accent)}@supports (color:color-mix(in lab, red, red)){.source-list a:focus-visible{outline:3px solid color-mix(in srgb, var(--accent) 35%, transparent)}}.source-list a:focus-visible{outline-offset:2px}.source-list a>svg:first-child{color:var(--accent-strong)}.source-list a>svg:last-child{color:var(--subtle-foreground)}.source-copy{flex-direction:column;gap:5px;min-width:0;display:flex}.source-copy>strong{font-size:13px}.source-copy>small{color:var(--muted-foreground);font-size:11px;font-weight:500;line-height:1.5}.source-meta{flex-wrap:wrap;align-items:center;gap:5px 9px;display:flex}.source-meta b{color:var(--accent-strong);font:700 9px/1 var(--font-geist-mono), monospace;letter-spacing:.06em;text-transform:uppercase}.source-meta>span{color:var(--subtle-foreground);font-size:9px;font-weight:500}.right-sidebar section+section{margin-top:30px}.aside-heading{margin-bottom:12px}.graph-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow-sm);border-radius:12px;overflow:hidden}.graph-stage{background:radial-gradient(circle at 50% 48%, var(--accent), transparent 38%), linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);height:190px;position:relative}@supports (color:color-mix(in lab, red, red)){.graph-stage{background:radial-gradient(circle at 50% 48%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 38%), linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px)}}.graph-stage{background-position:0 0,-1px -1px,-1px -1px;background-size:auto,24px 24px,24px 24px}.graph-edge{z-index:1;transform-origin:0;background:var(--border-strong);width:73px;height:1px;position:absolute;top:50%;left:50%}.edge-one{transform:rotate(-36deg)}.edge-two{transform:rotate(42deg)}.edge-three{transform:rotate(152deg)}.graph-node{z-index:2;border:2px solid var(--surface);background:var(--surface-strong);width:40px;height:40px;color:var(--muted-foreground);box-shadow:0 0 0 1px var(--border), var(--shadow-sm);font:700 9px/1 var(--font-geist-mono), monospace;border-radius:50%;place-items:center;transition:background .18s,color .18s,box-shadow .18s;display:grid;position:absolute}.graph-node:hover{background:var(--accent-soft);color:var(--accent-strong);box-shadow:0 0 0 2px var(--accent), var(--shadow-md)}.graph-center{background:var(--accent);color:#fff;width:44px;height:44px;top:calc(50% - 22px);left:calc(50% - 22px)}.graph-related-1{top:24%;left:71%}.graph-related-2{top:67%;left:68%}.graph-related-3{top:69%;left:22%}.graph-card p{border-top:1px solid var(--border);color:var(--subtle-foreground);margin:0;padding:10px 12px;font-size:9px;line-height:1.5}.toc-section nav{flex-direction:column;gap:2px;display:flex}.toc-section a{min-height:34px;color:var(--muted-foreground);border-radius:7px;grid-template-columns:12px minmax(0,1fr);align-items:center;gap:7px;padding:3px 7px;font-size:11px;text-decoration:none;transition:background .18s,color .18s;display:grid}.toc-section a:hover{background:var(--surface-soft);color:var(--foreground)}.toc-section a>span{background:var(--border-strong);border-radius:50%;justify-self:center;width:5px;height:5px}.toc-section a.is-active{background:var(--accent-soft);color:var(--accent-strong);font-weight:650}.toc-section a.is-active>span{background:var(--accent);box-shadow:0 0 0 4px var(--accent)}@supports (color:color-mix(in lab, red, red)){.toc-section a.is-active>span{box-shadow:0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent)}}.keyboard-card{border:1px solid var(--border);background:var(--surface-soft);border-radius:10px;padding:13px}.keyboard-card>strong{margin-bottom:10px;font-size:11px;display:block}.keyboard-card>div{min-height:31px;color:var(--muted-foreground);justify-content:space-between;align-items:center;font-size:9px;display:flex}.command-overlay,.mobile-nav-overlay{z-index:100;background:var(--overlay);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);position:fixed;inset:0}.command-overlay{justify-content:center;align-items:flex-start;padding:min(14vh,120px) 18px 18px;display:flex}.command-dialog{border:1px solid var(--border-strong);background:var(--surface);width:min(100%,620px);box-shadow:var(--shadow-lg);border-radius:15px;overflow:hidden}.command-input-wrap{border-bottom:1px solid var(--border);min-height:64px;color:var(--muted-foreground);grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:11px;padding:0 17px;display:grid}.command-input-wrap input{width:100%;height:58px;color:var(--foreground);background:0 0;border:0;outline:0;font-size:15px}.command-input-wrap input::placeholder{color:var(--subtle-foreground)}.command-results{max-height:min(52vh,430px);padding:8px;overflow-y:auto}.command-results>button{width:100%;min-height:58px;color:var(--foreground);text-align:left;background:0 0;border:0;border-radius:9px;grid-template-columns:36px minmax(0,1fr) auto;align-items:center;gap:10px;padding:6px 10px;display:grid}.command-results>button.is-active{background:var(--accent-soft)}.command-results>button.is-soon{opacity:.5}.result-icon{border:1px solid var(--border);background:var(--surface-soft);width:34px;height:34px;color:var(--muted-foreground);border-radius:8px;place-items:center;display:grid}.command-results>button>span:nth-child(2){flex-direction:column;min-width:0;display:flex}.command-results strong{font-size:12px}.command-results small{color:var(--subtle-foreground);font-size:9px}.command-results code{color:var(--muted-foreground);font:500 9px/1 var(--font-geist-mono), monospace}.empty-search{min-height:170px;color:var(--subtle-foreground);text-align:center;flex-direction:column;justify-content:center;align-items:center;display:flex}.empty-search strong{color:var(--foreground);margin-top:10px;font-size:13px}.empty-search span{margin-top:3px;font-size:10px}.command-footer{border-top:1px solid var(--border);background:var(--surface-soft);min-height:42px;color:var(--subtle-foreground);align-items:center;gap:16px;padding:0 14px;font-size:9px;display:flex}.command-footer span{align-items:center;gap:4px;display:inline-flex}.command-footer kbd{min-width:20px;min-height:19px;padding:0 4px}.mobile-header,.mobile-nav-overlay{display:none}@media (max-width:1240px){.app-shell{grid-template-columns:var(--left-width) minmax(0, 1fr)}.right-sidebar{display:none}.article-topbar,.article{width:min(100%,960px)}.mobile-toc{border:1px solid var(--border);background:var(--surface);border-radius:10px;margin-top:20px;display:block}.mobile-toc summary{min-height:46px;color:var(--muted-foreground);cursor:pointer;align-items:center;gap:8px;padding:0 14px;font-size:12px;font-weight:650;display:flex}.mobile-toc>div{border-top:1px solid var(--border);grid-template-columns:repeat(3,1fr);gap:4px;padding:10px;display:grid}.mobile-toc a{color:var(--muted-foreground);border-radius:6px;padding:6px 8px;font-size:10px;text-decoration:none}.mobile-toc a:hover{background:var(--surface-soft);color:var(--foreground)}}@media (max-width:860px){:root{--left-width:0px}html{scroll-padding-top:76px}.app-shell{padding-top:60px;display:block}.left-sidebar{display:none}.mobile-header{z-index:60;border-bottom:1px solid var(--border);background:var(--surface);justify-content:space-between;align-items:center;height:60px;display:flex;position:fixed;top:0;left:0;right:0}@supports (color:color-mix(in lab, red, red)){.mobile-header{background:color-mix(in srgb, var(--surface) 92%, transparent)}}.mobile-header{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding:0 10px}.mobile-header button{border-color:var(--border);color:var(--foreground)}.mobile-brand{letter-spacing:-.025em;align-items:center;gap:8px;font-size:14px;font-weight:700;display:flex}.mobile-brand span{color:var(--accent-strong);font:700 12px/1 var(--font-geist-mono), monospace}.mobile-nav-overlay{display:block}.mobile-nav-panel{background:var(--surface);width:min(88vw,320px);height:100%;box-shadow:var(--shadow-lg);flex-direction:column;padding:20px 18px;display:flex;overflow:hidden}.mobile-nav-panel .mobile-close{display:grid}.article-topbar{min-height:54px;padding:0 22px}.topbar-actions button:last-child{display:none}.article{padding:0 22px 90px}.article-hero{padding:34px 0 40px}.article-section{grid-template-columns:1fr;gap:10px;padding:48px 0}.section-number{padding:0}.strategy-grid,.source-lenses{grid-template-columns:1fr}.source-lenses>div{min-height:0}.source-lenses strong{margin-top:18px}.strategy-step{min-height:112px}.strategy-step p{margin-top:20px}.complexity-grid{grid-template-columns:repeat(2,1fr)}.complexity-grid>div:nth-child(2){border-right:0}.complexity-grid>div:nth-child(-n+2){border-bottom:1px solid var(--border)}}@media (max-width:580px){.article-topbar{padding:0 16px}.breadcrumbs span:first-child,.breadcrumbs 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code{font-size:11px}.command-overlay{align-items:flex-end;padding:10px}.command-dialog{border-radius:16px;max-height:84vh}.command-results{max-height:56vh}.command-footer{display:none}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!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 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