:root{--bg: #0a0e1a;--panel: #11182e;--panel2: #161f3a;--border: #25304f;--text: #eef2ff;--muted: #8a96c0;--accent: #60a5fa;--accent-ink: #08111f;--shadow: rgba(0, 0, 0, .35);--stage-top: #131c3a;--stage-bottom: #070a14;--stage-border: #243154;--caption-bg: rgba(18, 24, 44, .72);--caption-border: #2c3a63;--caption-text: #eef2ff;--code-bg: #0b1020;--code-fg: #d7e0ff;--code-border: #243154;--syn-keyword: #c792ea;--syn-fn: #82aaff;--syn-string: #c3e88d;--syn-number: #f78c6c;--syn-comment: #546e7a;--syn-built-in: #ffcb6b;--syn-params: #d7e0ff;--syn-punct: #89ddff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}:root[data-theme=light]{--bg: #eef1f8;--panel: #ffffff;--panel2: #f1f4fb;--border: #d7deec;--text: #161d33;--muted: #6a7494;--accent: #2563eb;--accent-ink: #ffffff;--shadow: rgba(40, 60, 110, .14);--stage-top: #e8edf6;--stage-bottom: #d8e0ed;--stage-border: #c5cfe0;--caption-bg: rgba(255, 255, 255, .88);--caption-border: #c5cfe0;--caption-text: #161d33;--code-bg: #f4f6fb;--code-fg: #1a2440;--code-border: #d7deec;--syn-keyword: #7c3aed;--syn-fn: #2563eb;--syn-string: #15803d;--syn-number: #c2410c;--syn-comment: #64748b;--syn-built-in: #b45309;--syn-params: #1a2440;--syn-punct: #0e7490}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text)}.app{display:grid;grid-template-columns:264px 1fr;grid-template-rows:1fr;height:100vh;height:100dvh;overflow:hidden}.main-column{min-height:0;height:100%;overflow:hidden;display:flex;flex-direction:column}.main-column>.stage-wrap{flex:1}.sidebar{display:flex;flex-direction:column;background:var(--panel);border-right:1px solid var(--border);height:100vh;height:100dvh;min-height:0}.sidebar-head{padding:22px 20px 14px;flex-shrink:0}.sidebar-brand{border:none;background:none;padding:0;cursor:pointer;text-align:left}.sidebar-brand:hover span{opacity:.9}.sidebar-search-btn{display:flex;align-items:center;justify-content:space-between;width:100%;margin-top:10px;height:36px;border-radius:9px;border:1px solid var(--border);background:var(--panel2);color:var(--muted);font-size:13px;padding:0 10px;cursor:pointer;transition:border-color .14s,color .14s}.sidebar-search-btn:hover{border-color:var(--accent);color:var(--text)}.sidebar-search-btn kbd{font-family:ui-monospace,monospace;font-size:10px;padding:2px 5px;border-radius:4px;border:1px solid var(--border);background:var(--panel);color:var(--muted)}.sidebar-nav{overflow-y:auto;flex:1;min-height:0;padding-bottom:8px}.sidebar-footer{display:flex;gap:8px;padding:12px 16px 16px;border-top:1px solid var(--border);flex-shrink:0}.sidebar-footer-btn{flex:1;padding:9px 10px;border-radius:9px;border:1px solid var(--border);background:var(--panel2);color:var(--muted);font-size:13px;font-weight:600;cursor:pointer;transition:background .14s,color .14s,border-color .14s}.sidebar-footer-btn:hover{color:var(--text)}.sidebar-subhead{display:flex;align-items:center;justify-content:space-between;gap:8px}.sidebar-contribute{display:inline-flex;align-items:center;gap:5px;padding:3px 8px;border-radius:7px;border:1px solid var(--border);color:var(--muted);font-family:inherit;font-size:11px;font-weight:600;text-decoration:none;white-space:nowrap;transition:color .14s,border-color .14s,background .14s}.sidebar-contribute:hover{color:var(--text);border-color:var(--accent);background:var(--panel2)}.sidebar-footer-btn[data-active=true]{color:var(--accent-ink);background:var(--accent);border-color:var(--accent)}.nav-item{display:flex;flex-direction:column;align-items:flex-start;gap:2px;width:100%;text-align:left;background:transparent;border:none;color:var(--muted);font-size:14.5px;padding:9px 20px;cursor:pointer;border-left:3px solid transparent;transition:background .14s,color .14s,border-color .14s}.nav-item-blurb{font-size:11px;color:var(--muted);line-height:1.3}.nav-item:hover{background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--text)}.nav-item[data-active=true]{color:var(--text);background:color-mix(in srgb,var(--accent) 14%,transparent);border-left-color:var(--accent);font-weight:600}.nav-group{margin-bottom:2px}.nav-group-head{display:flex;align-items:center;justify-content:space-between;width:100%;padding:10px 20px 6px;border:none;background:transparent;cursor:pointer;text-align:left;transition:color .14s}.nav-group-head:hover{color:var(--text)}.nav-group-label{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted)}.nav-group-head:hover .nav-group-label{color:var(--text)}.nav-group-meta{display:flex;align-items:center;gap:8px}.nav-group-count{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:10px;font-weight:700;color:var(--muted);background:var(--panel2);border:1px solid var(--border);border-radius:6px;padding:1px 6px;min-width:18px;text-align:center}.nav-group-chevron{width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .16s ease;margin-top:-3px}.nav-group[data-open=true] .nav-group-chevron{transform:rotate(-135deg);margin-top:3px}.nav-group-items{padding-bottom:4px}.link-section{font-size:11px;color:var(--muted);font-weight:500}.section-tabs{display:flex;gap:6px;padding:0 16px 14px}.section-tab{flex:1;min-width:0;padding:8px 6px;border-radius:9px;border:1px solid var(--border);background:var(--panel2);color:var(--muted);font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:12px;font-weight:700;letter-spacing:.5px;cursor:pointer;transition:background .14s,color .14s,border-color .14s}.section-tab:hover{color:var(--text);background:color-mix(in srgb,var(--accent) 10%,var(--panel2))}.section-tab[data-active=true]{color:var(--accent-ink);background:var(--accent);border-color:var(--accent)}.mobile-section-tabs{display:none;padding:0 0 12px;max-width:320px}.stage-wrap{min-height:0;height:100%;overflow-y:auto;overflow-x:hidden;padding:24px 32px 40px;display:flex;flex-direction:column;gap:16px}.stage-wrap>*{flex-shrink:0}.topic-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}.topic-head-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.page-head-actions{display:flex;align-items:center;flex-shrink:0}.sidebar-theme-toggle{flex:0 0 40px;width:40px}.stage{position:relative;overflow-x:auto;overflow-y:hidden;background:radial-gradient(circle at 50% 28%,var(--stage-top) 0%,var(--stage-bottom) 78%);border:1px solid var(--stage-border);border-radius:18px;display:flex;flex-direction:column;align-items:stretch;gap:20px;padding:28px 22px 22px}.stage-measure{position:absolute;left:22px;right:22px;top:28px;height:0;visibility:hidden;pointer-events:none;z-index:-1;overflow:hidden}.stage-measure-step{position:absolute;top:0;left:0;right:0;width:100%;display:flex;justify-content:center}.stage-canvas{width:100%;flex-shrink:0;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;display:flex;align-items:center;justify-content:center;padding:4px 2px}.stage-canvas-inner{width:100%;max-width:100%;display:flex;align-items:center;justify-content:center;min-height:min-content;padding:0 4px;box-sizing:border-box}.stage-caption-measure{position:absolute;left:22px;right:22px;bottom:22px;height:0;visibility:hidden;pointer-events:none;z-index:-1;overflow:hidden}.stage-caption-measure-step{position:absolute;top:0;left:0;right:0;display:flex;justify-content:center}.caption-block{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:8px;max-width:92%;align-self:center;flex-shrink:0}.caption{flex:0 0 auto;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:16px;line-height:1.4;color:var(--caption-text);background:var(--caption-bg);border:1px solid var(--caption-border);border-radius:12px;padding:10px 20px;text-align:center;width:100%}.step-insight{font-size:13.5px;line-height:1.45;color:var(--muted);text-align:center;padding:0 8px}.controls-bar{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:14px 16px}.controls-root{display:flex;flex-direction:column;gap:12px}.controls-toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.controls-playback{display:flex;align-items:center;gap:8px;flex:0 0 auto}.controls-step{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:13px;color:var(--muted);min-width:86px;flex:0 0 auto}.controls-extra{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-left:auto}.controls-speed{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.controls-speed-label{font-family:ui-monospace,monospace;font-size:13px;color:var(--muted)}.scrubber{width:100%}.ctrl{width:44px;height:44px;border-radius:11px;border:1px solid var(--border);background:var(--panel2);color:var(--text);font-size:15px;cursor:pointer;transition:background .14s,transform 80ms;flex:0 0 auto}.ctrl:hover{background:color-mix(in srgb,var(--accent) 14%,var(--panel2))}.ctrl:active{transform:scale(.94)}.ctrl-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:700;width:52px}.ctrl-primary:hover{background:color-mix(in srgb,var(--accent) 85%,white)}.chip{border:1px solid var(--border);background:var(--panel2);color:var(--muted);border-radius:9px;padding:6px 11px;font-size:13px;font-family:ui-monospace,monospace;cursor:pointer;transition:all .14s;flex:0 0 auto}.chip:hover{color:var(--text)}.chip[data-active=true]{background:color-mix(in srgb,var(--accent) 18%,transparent);color:var(--accent);border-color:var(--accent)}.scrubber{-webkit-appearance:none;-moz-appearance:none;appearance:none;height:6px;border-radius:6px;background:var(--panel2);outline:none;cursor:pointer}.scrubber::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--accent);border:2px solid color-mix(in srgb,var(--accent) 40%,white)}.scrubber-wrap{display:flex;flex-direction:column;gap:8px}.scrubber-track{position:relative;width:100%}.scrubber-markers{position:absolute;left:8px;right:8px;top:-2px;height:10px;pointer-events:none;z-index:1}.scrubber-marker{position:absolute;top:0;width:3px;height:10px;margin-left:-1.5px;border:none;border-radius:2px;background:var(--muted);opacity:.45;cursor:pointer;pointer-events:auto;padding:0;transition:opacity .14s,background .14s,height .14s}.scrubber-marker[data-past=true]{background:var(--accent);opacity:.55}.scrubber-marker[data-active=true]{background:var(--accent);opacity:1;height:14px;top:-2px}.scrubber-marker:hover{opacity:1;background:var(--accent)}.scrubber-track .scrubber{width:100%;position:relative;z-index:0}.chapter-now{display:flex;align-items:center;gap:10px}.chapter-now-text{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px;text-align:center}.chapter-now-kicker{font-family:ui-monospace,monospace;font-size:11px;letter-spacing:.5px;color:var(--muted);text-transform:uppercase}.chapter-now-title{font-size:14px;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chapter-jump{flex:0 0 36px;width:36px;height:36px;border-radius:9px;border:1px solid var(--border);background:var(--panel2);color:var(--text);font-size:15px;cursor:pointer;transition:background .14s,opacity .14s}.chapter-jump:hover:not(:disabled){background:color-mix(in srgb,var(--accent) 14%,var(--panel2));border-color:var(--accent)}.chapter-jump:disabled{opacity:.35;cursor:default}.kbd-hints{display:flex;gap:14px;font-family:ui-monospace,monospace;font-size:11px;color:var(--muted);opacity:.75}.topic-category{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:12px;letter-spacing:2px;color:var(--accent);text-transform:uppercase}.topic-title{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:clamp(1.5rem,4vw,2.125rem);font-weight:800;color:var(--text);margin:4px 0 0;line-height:1.15}.mobile-toolbar,.mobile-toolbar-shell{display:none;align-items:center;gap:10px;width:100%;flex-shrink:0;padding:max(10px,env(safe-area-inset-top)) 14px 0}.mobile-search-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:10px;border:1px solid var(--border);background:var(--panel);color:var(--text);font-size:18px;cursor:pointer;flex:0 0 auto}.mobile-search-btn:hover{background:var(--panel2)}.mobile-toolbar-topic{padding-bottom:0}.mobile-toolbar-topic .mobile-section-tabs{display:flex;flex:1;min-width:0;padding:0}.mobile-menu-btn{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 12px;border-radius:10px;border:1px solid var(--border);background:var(--panel);color:var(--text);font-size:14px;font-weight:600;cursor:pointer;flex:0 0 auto;transition:background .14s}.mobile-menu-btn:hover{background:var(--panel2)}.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;border-radius:10px;border:1px solid var(--border);background:var(--panel);color:var(--text);font-size:14px;cursor:pointer;transition:background .14s}.theme-toggle:hover{background:var(--panel2)}.nav-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;background:#0408128c;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.nav-drawer{width:min(300px,88vw);height:100%;height:100dvh;background:var(--panel);border-right:1px solid var(--border);box-shadow:8px 0 32px var(--shadow);overflow:hidden;display:flex;flex-direction:column;animation:drawer-in .18s ease-out}.nav-drawer .sidebar{display:flex;width:100%;height:100%;border-right:none}@keyframes drawer-in{0%{transform:translate(-100%)}to{transform:translate(0)}}.info{display:grid;grid-template-columns:1fr 1fr;gap:16px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:18px 20px;min-width:0}.panel-title{font-size:12px;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);margin-bottom:12px}.explanation{white-space:pre-wrap;line-height:1.6;color:var(--text);opacity:.92;font-size:14.5px;margin:0}.code{margin:0;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:13.5px;line-height:1.55;color:var(--code-fg);background:var(--code-bg);border:1px solid var(--code-border);border-radius:10px;padding:16px;overflow-x:auto}.code code{font-family:inherit;font-size:inherit;background:none;padding:0}.code .hljs-keyword{color:var(--syn-keyword)}.code .hljs-title.function_,.code .hljs-title.class_{color:var(--syn-fn)}.code .hljs-string{color:var(--syn-string)}.code .hljs-number{color:var(--syn-number)}.code .hljs-comment{color:var(--syn-comment);font-style:italic}.code .hljs-built_in{color:var(--syn-built-in)}.code .hljs-params{color:var(--syn-params)}.code .hljs-punctuation{color:var(--syn-punct)}.code .hljs-variable{color:var(--code-fg)}.code .hljs-property{color:var(--syn-built-in)}.code-line{display:flex;gap:12px;padding:1px 4px;border-radius:4px;margin:0 -4px}.code-line-active{background:color-mix(in srgb,var(--accent) 16%,transparent);box-shadow:inset 3px 0 0 var(--accent)}.code-ln{flex:0 0 2ch;text-align:right;color:var(--muted);opacity:.55;-webkit-user-select:none;user-select:none}.code-body{flex:1;min-width:0}.code-block-wrap{position:relative}.code-copy-btn{position:absolute;top:10px;right:10px;z-index:1;border:1px solid var(--border);background:var(--panel);color:var(--muted);font-size:11px;font-weight:600;padding:4px 8px;border-radius:6px;cursor:pointer;transition:color .14s,border-color .14s}.code-copy-btn:hover{color:var(--text);border-color:var(--accent)}.color-legend-panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;overflow:hidden}.color-legend-summary{padding:10px 14px;font-size:12px;font-weight:600;letter-spacing:.5px;color:var(--muted);cursor:pointer;list-style:none;-webkit-user-select:none;user-select:none}.color-legend-summary::-webkit-details-marker{display:none}.color-legend-summary:after{content:"▾";float:right;color:var(--muted)}.color-legend-panel[open] .color-legend-summary:after{content:"▴"}.color-legend{display:flex;flex-wrap:wrap;gap:10px 18px;padding:0 14px 12px;font-size:12px;color:var(--muted)}.legend-item{display:inline-flex;align-items:center;gap:6px}.legend-swatch{width:12px;height:12px;border-radius:3px;flex-shrink:0}.chapter-panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:0;overflow:hidden}.chapter-panel-toggle{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:12px 14px;border:none;background:transparent;color:var(--text);cursor:pointer;text-align:left;transition:background .14s}.chapter-panel-toggle:hover{background:color-mix(in srgb,var(--accent) 6%,transparent)}.chapter-panel-toggle-left{display:flex;align-items:center;gap:10px;min-width:0;flex:1}.chapter-panel-collapsed-hint{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chapter-panel-chevron{flex:0 0 auto;font-size:12px;color:var(--muted)}.chapter-chips{display:flex;flex-wrap:wrap;gap:8px;padding:0 14px 12px}.chapter-chip{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);border-radius:10px;background:var(--panel2);color:var(--muted);padding:8px 12px;font-size:13px;cursor:pointer;transition:border-color .14s,background .14s,color .14s;max-width:100%}.chapter-chip:hover{border-color:var(--accent);color:var(--text)}.chapter-chip[data-past=true]{opacity:.7}.chapter-chip[data-active=true]{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--panel2));color:var(--text);font-weight:600}.chapter-chip-num{flex:0 0 auto;font-family:ui-monospace,monospace;font-size:11px;font-weight:700;color:var(--accent)}.chapter-chip-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-meta{margin-top:10px;width:100%}.topic-blurb{margin:0;font-size:14.5px;color:var(--muted);line-height:1.5;max-width:640px}.topic-badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.badge{font-family:ui-monospace,monospace;font-size:11px;padding:4px 8px;border-radius:7px;background:var(--panel2);border:1px solid var(--border);color:var(--muted)}.badge-use{color:var(--text);border-color:color-mix(in srgb,var(--accent) 30%,var(--border))}.topic-nav-bar{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;flex-shrink:0}.topic-nav-btn{display:flex;flex-direction:column;align-items:flex-start;gap:2px;min-height:52px;padding:10px 14px;border-radius:12px;border:1px solid var(--border);background:var(--panel);color:var(--text);cursor:pointer;text-align:left;transition:border-color .14s,background .14s}.topic-nav-btn-next{align-items:flex-end;text-align:right}.topic-nav-btn:hover:not(:disabled){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 6%,var(--panel))}.topic-nav-btn:disabled{opacity:.45;cursor:default}.topic-nav-label{font-family:ui-monospace,monospace;font-size:10px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:var(--muted)}.topic-nav-title{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.prereq-panel{margin:0}.prereq-hint{margin:0 0 10px;font-size:13px;color:var(--muted);line-height:1.4}.prereq-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.prereq-link{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);border-radius:9px;background:var(--panel2);color:var(--accent);padding:8px 12px;font-size:13px;font-weight:600;cursor:pointer;transition:border-color .14s}.prereq-link:hover{border-color:var(--accent)}.prereq-link-section{font-family:ui-monospace,monospace;font-size:10px;font-weight:700;color:var(--muted)}.related-panel{margin:0}.related-hint{margin:0 0 10px;font-size:13px;color:var(--muted);line-height:1.4}.related-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.related-link{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);border-radius:9px;background:var(--panel2);color:var(--accent);padding:8px 12px;font-size:13px;font-weight:600;cursor:pointer;transition:border-color .14s}.related-link:hover{border-color:var(--accent)}.related-link-section{font-family:ui-monospace,monospace;font-size:10px;font-weight:700;color:var(--muted)}.favorite-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;border-radius:10px;border:1px solid var(--border);background:var(--panel);color:var(--muted);cursor:pointer;transition:border-color .14s,color .14s,background .14s}.favorite-btn:hover{background:var(--panel2)}.favorite-btn[data-active=true]{color:#eab308;border-color:color-mix(in srgb,#eab308 40%,var(--border))}.page-wrap{gap:20px}.page-head{margin-bottom:4px}.page-title{font-size:clamp(1.5rem,4vw,2rem);font-weight:800;margin:0;color:var(--text)}.page-subtitle{margin:8px 0 0;font-size:14.5px;color:var(--muted);line-height:1.5;max-width:640px}.paths-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.path-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:18px 20px;display:flex;flex-direction:column;gap:10px}.path-card-title{margin:0;font-size:17px;font-weight:700;color:var(--text)}.path-card-meta{margin:0;font-size:12px;color:var(--muted)}.path-progress{height:6px;border-radius:999px;background:var(--panel2);overflow:hidden}.path-progress-bar{height:100%;border-radius:inherit;background:var(--accent);transition:width .2s ease}.path-topic-list{list-style:none;margin:4px 0 0;padding:0;display:flex;flex-direction:column;gap:4px}.path-topic-btn{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:1px solid transparent;border-radius:9px;background:var(--panel2);color:var(--text);padding:8px 10px;cursor:pointer;transition:border-color .14s,background .14s}.path-topic-btn:hover{border-color:var(--accent)}.path-topic-num{flex:0 0 22px;font-family:ui-monospace,monospace;font-size:11px;font-weight:700;color:var(--accent)}.path-topic-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}.path-topic-name{font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.path-topic-section{font-size:11px;color:var(--muted)}.path-start-btn{margin-top:4px;align-self:flex-start;border:none;background:none;color:var(--accent);font-size:14px;font-weight:600;cursor:pointer;padding:4px 0;text-decoration:underline;text-underline-offset:2px}.search-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:300;background:#04081299;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:flex;align-items:flex-start;justify-content:center;padding:min(12vh,80px) 16px 16px}.search-modal{width:min(560px,100%);background:var(--panel);border:1px solid var(--border);border-radius:14px;box-shadow:0 24px 64px var(--shadow);overflow:hidden;display:flex;flex-direction:column}.search-input-wrap{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--border)}.search-icon{font-size:18px;color:var(--muted);flex-shrink:0}.search-input{flex:1;border:none;background:transparent;color:var(--text);font-size:16px;outline:none;min-width:0}.search-input::placeholder{color:var(--muted)}.search-kbd{font-family:ui-monospace,monospace;font-size:10px;padding:3px 6px;border-radius:4px;border:1px solid var(--border);color:var(--muted);flex-shrink:0}.search-results{list-style:none;margin:0;padding:6px;max-height:min(50vh,400px);overflow-y:auto}.search-empty-row{padding:16px;font-size:14px;color:var(--muted);text-align:center}.search-result{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;text-align:left;border:none;border-radius:9px;background:transparent;color:var(--text);padding:10px 12px;cursor:pointer;transition:background .14s}.search-result:hover,.search-result[data-active=true]{background:color-mix(in srgb,var(--accent) 12%,transparent)}.search-result-main{display:flex;flex-direction:column;gap:2px;min-width:0}.search-result-title{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.search-result-meta{font-size:11px;color:var(--muted)}.search-result-fav{flex-shrink:0;font-size:14px;color:#eab308;line-height:1}.search-footer{display:flex;gap:16px;padding:10px 16px;border-top:1px solid var(--border);font-size:11px;color:var(--muted)}.search-footer kbd{font-family:ui-monospace,monospace;padding:1px 4px;border-radius:3px;border:1px solid var(--border);font-size:10px}.keyboard-help-modal{max-width:min(420px,100%)}.keyboard-help-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--border)}.keyboard-help-title{margin:0;font-size:16px;font-weight:700;color:var(--text)}.keyboard-help-close{border:none;background:transparent;color:var(--muted);font-size:22px;line-height:1;cursor:pointer;padding:4px 8px;border-radius:6px}.keyboard-help-close:hover{background:var(--panel2);color:var(--text)}.keyboard-help-list{margin:0;padding:8px 16px 12px;display:flex;flex-direction:column;gap:10px}.keyboard-help-row{display:grid;grid-template-columns:88px 1fr;gap:12px;align-items:baseline}.keyboard-help-row dt{margin:0}.keyboard-help-row dd{margin:0;font-size:13px;color:var(--text);line-height:1.4}.keyboard-help-kbd{display:inline-block;font-family:ui-monospace,monospace;font-size:11px;padding:4px 8px;border-radius:6px;border:1px solid var(--border);background:var(--panel2);color:var(--text)}.stage-wrap.focus-mode>.stage{margin-top:auto;margin-bottom:auto}.focus-mode .controls-bar{flex-shrink:0}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);z-index:150;background:var(--panel);border:1px solid var(--accent);color:var(--text);font-size:13px;font-weight:600;padding:10px 16px;border-radius:10px;box-shadow:0 8px 24px var(--shadow)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.sidebar-search{width:100%;margin-top:12px;height:36px;border-radius:9px;border:1px solid var(--border);background:var(--panel2);color:var(--text);font-size:13px;padding:0 10px}.sidebar-search::placeholder{color:var(--muted)}.search-empty{padding:12px 20px;font-size:13px;color:var(--muted);margin:0}.quiz-panel{margin-top:0}.quiz-q{margin-bottom:16px}.quiz-q:last-of-type{margin-bottom:8px}.quiz-question{margin:0 0 8px;font-weight:600;font-size:14.5px}.quiz-options{display:flex;flex-direction:column;gap:6px}.quiz-opt{text-align:left;border:1px solid var(--border);background:var(--panel2);color:var(--text);border-radius:9px;padding:10px 12px;font-size:14px;cursor:pointer;transition:border-color .14s,background .14s}.quiz-opt:hover:not(:disabled){border-color:var(--accent)}.quiz-opt[data-state=picked]{border-color:var(--accent)}.quiz-opt[data-state=correct]{border-color:#22c55e;background:color-mix(in srgb,#22c55e 12%,var(--panel2))}.quiz-opt[data-state=wrong]{border-color:#ef4444;background:color-mix(in srgb,#ef4444 10%,var(--panel2))}.quiz-feedback{margin:8px 0 0;font-size:13px;line-height:1.5}.quiz-feedback.ok{color:#22c55e}.quiz-feedback.bad{color:#ef4444}.quiz-summary{margin:12px 0 0;font-size:14px;font-weight:600}.quiz-summary.ok{color:#22c55e}@media(min-width:901px){.color-legend-panel{border:1px solid var(--border);border-radius:12px;background:var(--panel)}.color-legend-summary{display:none}.color-legend{padding:10px 14px}}@media(max-width:1100px){.app{grid-template-columns:240px 1fr}.stage-wrap{padding:20px 20px 36px}}@media(max-width:900px){.app{grid-template-columns:1fr}.app>.sidebar{display:none}.mobile-toolbar,.mobile-toolbar-shell{display:flex}.topic-head-actions,.page-head-actions{display:none}.mobile-section-tabs{display:flex;flex:1;min-width:0;padding:0;max-width:none}.info{grid-template-columns:1fr}.stage-wrap{padding:max(12px,env(safe-area-inset-top)) max(14px,env(safe-area-inset-right)) max(28px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left));gap:14px}.topic-head{flex-direction:column;align-items:stretch;gap:12px}.controls-extra{margin-left:0;width:100%;justify-content:center}.controls-toolbar{flex-direction:column;align-items:stretch;gap:12px}.controls-playback{justify-content:center}.controls-step{text-align:center;width:100%}.chapter-now-kicker{font-size:10px}.chapter-now-title{font-size:13px}}@media(max-width:640px){.stage{padding:16px 10px 12px;border-radius:14px;gap:14px}.caption{font-size:14px;padding:9px 14px;max-width:100%}.caption-block{max-width:100%}.step-insight{font-size:12.5px}.controls-bar{padding:12px 10px}.ctrl{width:48px;height:48px}.ctrl-primary{width:56px}.color-legend{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;font-size:11px}.kbd-hints{display:none}.topic-badges{gap:5px}.badge{font-size:10px}.topic-nav-bar{gap:8px}.topic-nav-btn{min-height:48px;padding:8px 12px}.topic-nav-title{font-size:13px}.chapter-chip{padding:7px 10px;font-size:12px}.panel{padding:14px 16px}.code{font-size:12.5px;padding:12px}.explanation{font-size:14px}.mobile-menu-btn span{display:none}.mobile-menu-btn{padding:0;width:40px;justify-content:center}}@media(max-width:400px){.controls-speed .chip{padding:6px 8px;font-size:12px}.color-legend{grid-template-columns:1fr}.section-tab{font-size:11px;padding:7px 4px}.paths-grid{grid-template-columns:1fr}}.complexity-panel{display:flex;flex-direction:column;gap:10px;padding:12px 16px;border-radius:12px;border:1px solid var(--border);background:var(--panel)}.complexity-badges{display:flex;flex-wrap:wrap;gap:6px}.complexity-badge{font-family:ui-monospace,monospace;font-size:11px;font-weight:600;padding:4px 10px;border-radius:999px;background:var(--panel2);border:1px solid var(--border);color:var(--text)}.complexity-progress-label{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:6px}.complexity-progress-track{height:5px;border-radius:999px;background:var(--panel2);overflow:hidden}.complexity-progress-fill{height:100%;border-radius:inherit;background:var(--accent);transition:width .18s ease}.compare-page .compare-presets{display:flex;flex-wrap:wrap;gap:8px}.compare-selectors{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.compare-select{display:flex;flex-direction:column;gap:4px;font-size:11px;color:var(--muted);flex:1;min-width:140px}.compare-select select{height:36px;border-radius:8px;border:1px solid var(--border);background:var(--panel2);color:var(--text);font-size:13px;padding:0 10px}.compare-sync-controls{border:1px solid var(--border);border-radius:12px;padding:12px;background:var(--panel)}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-pane{display:flex;flex-direction:column;gap:12px;border:1px solid var(--border);border-radius:14px;padding:14px;background:var(--panel);min-width:0}.compare-pane-head{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.compare-pane-title{margin:0;font-size:15px;font-weight:700}.compare-pane-cat{font-size:11px;color:var(--muted)}.compare-step-label{text-align:center;font-size:12px;color:var(--muted);font-family:ui-monospace,monospace}.compare-hint{font-size:13px;color:var(--muted);text-align:center}.text-link{border:none;background:none;color:var(--accent);font-size:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:2px;padding:0}@media(max-width:900px){.compare-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.nav-drawer{animation:none}}
