:root{--ink:#172d4e;--muted:#64748b;--line:#dce5ed;--green:#09865e;--pale:#eaf7f1;--bg:#fff;--sidebar:#fafcfd;--amber:#a9630a;--red:#b64040;--blue:#245b9e}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}button,input,select{font:inherit;color:inherit}button,select,input[type=search]{min-height:44px;border:1px solid #bfcddc;border-radius:6px;background:white;padding:9px 13px}button,select{cursor:pointer}select{appearance:none;-webkit-appearance:none;padding-right:32px;background-image:linear-gradient(45deg,transparent 50%,#64748b 50%),linear-gradient(135deg,#64748b 50%,transparent 50%);background-position:calc(100% - 16px) 50%,calc(100% - 11px) 50%;background-size:5px 5px;background-repeat:no-repeat}button:hover{background:var(--pale);border-color:var(--green)}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #75b9eb;outline-offset:3px}.primary{display:inline-flex;align-items:center;justify-content:center;background:var(--green);border:1px solid var(--green);color:white;border-radius:6px;padding:10px 18px;min-height:44px;font-weight:600}.primary:hover{color:white;background:#066b4a;text-decoration:none}h1,h2,h3,p{margin-top:0}h1{font-size:38px;letter-spacing:-1px;line-height:1.3;margin-bottom:14px}h2{font-size:23px;line-height:1.5;margin-bottom:18px}h3{font-size:17px;line-height:1.5;margin-bottom:10px}p{margin-bottom:15px}small,.muted{color:var(--muted)}.sidebar{position:fixed;inset:0 auto 0 0;width:224px;padding:32px 22px;background:var(--sidebar);border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:3}.brand{font-size:22px;font-weight:800;letter-spacing:-.6px;color:var(--ink);white-space:nowrap}.brand span{color:var(--green)}.brand-note{font-size:11px;color:var(--muted);margin:6px 0 35px}.sidebar nav{display:grid;gap:8px}.sidebar nav a{display:flex;justify-content:space-between;padding:12px 15px;color:var(--ink);border-radius:6px}.sidebar nav a[aria-current=page]{background:var(--pale);color:var(--green);font-weight:700}.sidebar nav span{font-size:12px}.side-progress{margin-top:38px;font-size:12px}.side-progress>div{display:flex;justify-content:space-between}.side-progress p{font-size:11px;color:var(--muted);margin-top:7px}progress{width:100%;height:6px;border:0;appearance:none;background:#e6edf1;border-radius:8px;overflow:hidden;accent-color:var(--green)}progress::-webkit-progress-bar{background:#e6edf1}progress::-webkit-progress-value{background:var(--green)}progress::-moz-progress-bar{background:var(--green)}.side-foot{margin-top:auto;font-size:11px;color:var(--muted)}main{max-width:1590px;margin-left:224px;padding:40px 44px 60px;min-height:100vh;outline:none}.page-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:28px;margin-bottom:30px}.page-heading p{max-width:680px;color:var(--muted)}.page-heading .primary{white-space:nowrap;margin-top:7px}.overview{display:flex;align-items:center;gap:32px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin-bottom:30px}.metric{display:flex;align-items:baseline;gap:10px}.metric strong{font-size:25px;line-height:1.3}.metric span{font-size:12px;color:var(--muted)}.overview .hint{margin-left:auto;font-size:12px;color:var(--muted)}.topic-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.topic-tabs button{border-color:transparent;background:#f3f6f9;padding:7px 13px;min-height:38px;font-size:13px}.topic-tabs button[aria-pressed=true]{background:var(--pale);color:var(--green);border-color:#b2dfcb}.topic-tabs span{margin-left:5px;font-size:11px;color:var(--muted)}.filters{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0 0 18px}.search{flex:1;min-width:220px}.search input{width:100%;padding-left:14px}.filters label:not(.search){display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted)}.filters select{font-size:13px;min-width:108px}.list-meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px;margin:14px 0 10px}.list-meta button{padding:0;min-height:26px;border:0;color:var(--green);font-size:12px}.problem-list{border-top:1px solid var(--line)}.problem-row,.table-head{display:grid;grid-template-columns:38px minmax(180px,1fr) 115px 65px 88px 72px;gap:14px;align-items:center;padding:16px 10px;border-bottom:1px solid var(--line)}.table-head{padding-top:10px;padding-bottom:10px;background:#fafcfd;font-size:12px;color:var(--muted)}.problem-row:hover{background:#fafdfb}.problem-title{font-size:15px;font-weight:600;color:var(--ink)}.problem-title:hover{color:var(--green)}.problem-id{display:inline-block;min-width:35px;color:var(--muted);font-size:12px;font-weight:400;margin-right:8px}.row-topic{font-size:12px;color:var(--muted)}.difficulty{font-size:12px}.difficulty.easy{color:var(--green)}.difficulty.medium{color:var(--amber)}.difficulty.hard{color:var(--red)}.row-state{font-size:12px;color:var(--muted)}.row-state.done{color:var(--green)}.star{padding:0;min-height:38px;width:36px;border:0;background:transparent;font-size:22px;color:#8090a1}.star[aria-pressed=true]{color:#a9630a}.lesson-link{font-size:12px}.empty{padding:48px 16px;text-align:center;color:var(--muted)}.empty h2{color:var(--ink)}.footer{border-top:1px solid var(--line);padding-top:20px;margin-top:32px;font-size:12px;color:var(--muted)}.crumb{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px;margin-bottom:25px;flex-wrap:wrap}.lesson-heading{margin-bottom:28px}.lesson-heading .tags{display:flex;gap:14px;align-items:center;font-size:12px;margin:0 0 10px;color:var(--muted)}.lesson-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.lesson-actions button{font-size:13px}.lesson-actions a{font-size:13px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 166px;gap:40px;align-items:start}.lesson-content{min-width:0}.lesson-content section{margin-bottom:40px;scroll-margin-top:25px}.section-number{display:inline-block;color:var(--green);font:500 13px ui-monospace,monospace;margin-right:12px}.example{background:#f5f8fb;border-left:3px solid #9bb4cd;padding:16px 20px;white-space:pre-wrap;overflow-wrap:anywhere;font:13px/1.9 ui-monospace,monospace;border-radius:0 6px 6px 0}.callout{border-left:3px solid var(--green);background:var(--pale);padding:16px 18px;font-size:14px;white-space:pre-line;overflow-wrap:anywhere}.lesson-copy{white-space:pre-line;overflow-wrap:anywhere}.toc{position:sticky;top:30px;border-left:1px solid var(--line);padding-left:18px;font-size:12px}.toc strong{display:block;margin-bottom:16px}.toc a{display:block;color:var(--muted);margin:15px 0}.toc a.active{color:var(--green);font-weight:700}.toc a:hover{color:var(--green)}.visualizer{border:1px solid var(--line);border-radius:8px;overflow:hidden}.visual-top{padding:15px 20px;background:#fafcfd;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--muted)}.visual-top b{font-size:13px;color:var(--ink)}.scene{padding:24px 20px;min-height:210px}.scene h3{margin-bottom:20px}.cells{display:flex;gap:10px;flex-wrap:wrap;align-items:stretch;margin-bottom:22px}.cell{position:relative;display:flex;align-items:center;justify-content:center;min-width:62px;min-height:55px;max-width:100%;padding:12px 16px;border:1px solid #c9d6e0;border-radius:5px;background:#f8fafc;font:13px/1.65 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;text-align:center}.cell.active{border:2px solid var(--green);background:var(--pale);color:#076847;padding:11px 15px}.scene[data-topic='栈与堆'] .cells{border-left:3px solid #afbecb;padding-left:12px}.scene-explain{font-size:14px;white-space:pre-line;overflow-wrap:anywhere;margin-bottom:0}.visual-controls{border-top:1px solid var(--line);padding:16px 20px}.play-buttons{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.play-buttons button,.play-buttons select{font-size:12px;min-height:40px;padding:8px 12px}.play-buttons label{margin-left:auto;display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}.scrubber{display:flex;align-items:center;gap:12px;margin-top:16px;font-size:12px;color:var(--muted)}.scrubber{white-space:nowrap}.scrubber input{width:100%;min-width:0;accent-color:var(--green)}.visual-hint{font-size:12px;color:var(--muted);margin:14px 0 0}.code-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px}.code-head span{font-size:12px;color:var(--muted)}.code-head button{font-size:12px;min-height:34px;padding:6px 10px}pre{margin:0;padding:22px;background:#15283a;color:#deebf7;overflow:auto;border-radius:7px;font:13px/1.85 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:4}pre code{font:inherit}.complexity{margin-top:16px;font-size:13px;white-space:pre-line}.review{border-top:1px solid var(--line);padding:18px 0}.review summary{font-weight:600;cursor:pointer}.review p{margin:15px 0 0;white-space:pre-line}.lesson-bottom{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:22px;font-size:13px}.roadmap-intro{max-width:720px;color:var(--muted)}.stage{display:grid;grid-template-columns:60px 1fr;gap:24px;border-top:1px solid var(--line);padding:28px 0}.stage-number{font:600 27px ui-monospace,monospace;color:#88b2a4}.stage p{color:var(--muted);font-size:14px;max-width:780px}.stage-topics{display:flex;gap:10px;flex-wrap:wrap}.stage-topics button{font-size:13px}.stage-topics small{margin-left:10px}.stage-progress{max-width:500px;margin-top:15px;font-size:12px;color:var(--muted)}.progress-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:35px}.progress-stat{border-bottom:2px solid var(--line);padding:20px 0}.progress-stat b{font-size:36px;display:block;line-height:1.4}.progress-stat span{font-size:13px;color:var(--muted)}.progress-topic{display:grid;grid-template-columns:115px 1fr 70px;align-items:center;gap:20px;padding:13px 0;border-bottom:1px solid var(--line);font-size:13px}.progress-topic span{text-align:right;color:var(--muted);font-size:12px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:10px 18px;border-radius:6px;font-size:13px;z-index:10;max-width:90vw;box-shadow:0 4px 20px #172d4e25}#toast:empty{display:none}.skip-link{position:fixed;left:240px;top:-70px;padding:10px 20px;background:white;z-index:20}.skip-link:not(:focus-visible){clip-path:inset(50%);opacity:0}.skip-link:focus-visible{top:12px}
@media(min-width:1700px){main{margin-right:auto}}@media(max-width:1150px){.sidebar{width:195px;padding:26px 16px}main{margin-left:195px;padding:32px 26px}.brand{font-size:20px}.brand-note{font-size:10px}.lesson-layout{grid-template-columns:minmax(0,1fr) 140px;gap:23px}.problem-row,.table-head{grid-template-columns:32px minmax(145px,1fr) 88px 48px 64px 62px;gap:9px}.overview{gap:24px}.overview .hint{display:none}.metric{gap:7px}}
@media(max-width:850px){.lesson-layout{grid-template-columns:1fr}.toc{grid-row:1;position:static;display:flex;flex-wrap:wrap;gap:8px 16px;border-left:0;border-bottom:1px solid var(--line);padding:0 0 12px}.toc strong{display:none}.toc a{margin:0}.page-heading{display:block}.page-heading .primary{margin-top:0}.row-topic{display:none}.problem-row,.table-head{grid-template-columns:28px minmax(130px,1fr) 45px 60px;gap:9px}.lesson-link{display:none}.table-head .topic-head,.table-head .entry-head{display:none}.metric{display:block}.metric span{display:block}.filters{align-items:flex-start}.search{flex-basis:100%}h1{font-size:32px}}
@media(max-width:620px){.sidebar{position:static;width:auto;padding:17px 18px 12px;border-right:0;border-bottom:1px solid var(--line)}.brand-note{margin:3px 0 12px;font-size:11px}.sidebar nav{display:flex;gap:6px}.sidebar nav a{padding:8px 13px;font-size:13px;gap:13px}.side-progress,.side-foot{display:none}main{margin:0;padding:26px 18px 40px;min-height:70vh}.page-heading{margin-bottom:24px}h1{font-size:29px}h2{font-size:21px}.page-heading p{font-size:14px}.overview{gap:30px;padding:14px 0;margin-bottom:22px}.metric strong{font-size:23px}.topic-tabs{gap:6px}.topic-tabs button{font-size:12px;padding:6px 9px;min-height:36px}.filters{gap:8px}.filters label:not(.search){flex:1;display:grid;gap:3px}.filters select{width:100%;min-width:0;padding:8px;font-size:12px}.problem-row,.table-head{padding-left:0;padding-right:0;grid-template-columns:25px minmax(0,1fr) 35px 52px;gap:8px}.problem-title{font-size:13px}.problem-id{display:block;line-height:1.3;margin-bottom:4px}.row-state,.difficulty{font-size:11px}.star{width:25px}.crumb{margin-bottom:18px}.lesson-layout{gap:24px}.scene{padding:20px 14px;min-height:220px}.cell{font-size:12px;padding:10px 12px}.cell.active{padding:9px 11px}.visual-top,.visual-controls{padding:14px}.play-buttons label{margin:4px 0 0;width:100%}.lesson-content section{margin-bottom:30px}pre{padding:16px;font-size:12px}.stage{grid-template-columns:30px 1fr;gap:16px}.stage-number{font-size:22px}.stage-topics button{width:100%;text-align:left}.progress-summary{gap:12px}.progress-stat b{font-size:30px}.progress-stat span{font-size:12px}.progress-topic{grid-template-columns:80px 1fr 52px;gap:12px;font-size:12px}.skip-link{left:15px}.lesson-actions .primary{width:100%}}
.filters select,.play-buttons select{padding-right:32px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
/* ---------- 统一可视化引擎 ---------- */
.lab{--purple:#7c3aed;--amber-bg:#fff7e6;container-type:inline-size;outline:none}
.lab-input{border:1px solid var(--line);border-radius:8px;padding:16px 18px;margin-bottom:16px;background:#fff}
.lab-fields{display:flex;flex-wrap:wrap;gap:10px 14px;align-items:flex-end}
.lab-field{display:flex;flex-direction:column;gap:6px;flex:1 1 160px;font-size:13px;font-weight:700}
.lab-field.wide{flex-basis:100%}
.lab-field input,.lab-field textarea{font:14px ui-monospace,SFMono-Regular,Menlo,monospace;padding:10px 12px;border:1px solid #cbd5e1;border-radius:6px;color:var(--ink);background:#fff;width:100%;resize:vertical}
.lab-field input:focus,.lab-field textarea:focus{outline:2px solid var(--green);outline-offset:1px}
.lab-apply{min-height:42px}
.lab-hint{font-size:12px;color:var(--muted);margin:10px 0}
.lab-presets{display:flex;flex-wrap:wrap;gap:8px}
.lab-presets button{font-size:13px}
.lab-error{margin:10px 0 0;color:var(--red);font-size:13px;font-weight:700}
.lab-grid{display:grid;gap:16px}
@container (min-width:760px){.lab-grid{grid-template-columns:minmax(0,1.15fr) minmax(320px,1fr);align-items:start}.lab-side{position:sticky;top:16px;display:flex;flex-direction:column}.lab-codebox{order:-1;margin-bottom:6px}.lab-codebox h3{margin-top:0!important}.lab-stepbox h3{margin-top:18px!important}}
.lab-stage,.lab-side{border:1px solid var(--line);border-radius:8px;padding:16px 18px;min-width:0;background:#fff}
.lab-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:10px}
.lab-head b{font-size:17px}.lab-counter{font-size:12px;color:var(--muted)}
.lab-phases{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.lab-phases span{font-size:12px;padding:5px 9px;border-radius:5px;background:#f1f5f9;color:var(--muted)}
.lab-phases span.past{color:var(--green);background:var(--pale)}
.lab-phases span.on{background:var(--amber-bg);color:var(--amber);box-shadow:inset 0 -2px 0 var(--amber);font-weight:700}
.lab-views{display:flex;flex-direction:column;gap:14px;min-height:120px}
.lab-legend{font-size:12px;color:var(--muted);margin:12px 0 0;line-height:1.6}
.lab-predict{margin-top:12px;border:1px solid #c4b5fd;background:#f5f3ff;border-radius:8px;padding:12px 14px;font-size:14px}
.lab-options{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 4px}
.lab-options button.right{border-color:var(--green);background:var(--pale);color:var(--green)}
.lab-options button.wrong{border-color:var(--red);background:#fdeeee;color:var(--red)}
.lab-feedback{margin:8px 0;font-size:13px}.lab-feedback.ok{color:var(--green)}.lab-feedback.no{color:var(--red)}
.lab-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:16px}
.lab-speed{font-size:12px;color:var(--muted);display:flex;gap:6px;align-items:center}
.lab-timeline{display:flex;align-items:center;gap:10px;font-size:12px;font-weight:700;margin-top:12px}
.lab-timeline input{flex:1;accent-color:var(--green)}
.lab-predict-toggle{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--muted);margin-top:8px}
.lab-bar{height:4px;background:#eef2f6;border-radius:2px;margin-top:12px;overflow:hidden}.lab-bar i{display:block;height:100%;background:var(--green);transition:width .2s}
.lab-keys{font-size:12px;color:var(--muted);margin:8px 0 0}
.lab-side h3{font-size:16px;margin:0 0 10px}.lab-side h3:not(:first-child){margin-top:18px}
.lab-title{font-weight:700;margin:0 0 8px}
.lab-formula{background:#eef4fb;color:var(--blue);border-radius:6px;padding:10px 12px;font-size:13px;white-space:pre-wrap;word-break:break-word;margin:0 0 10px}
.lab-explain{font-size:14px;line-height:1.7;margin:0 0 10px}
.lab-insight{border-left:3px solid var(--green);background:var(--pale);padding:10px 12px;font-size:13px;line-height:1.65;margin-bottom:10px}
.lab-result{display:flex;flex-direction:column;gap:4px;padding:10px 0;border-top:1px solid var(--line)}
.lab-rlabel{font-size:12px;color:var(--muted)}.lab-rvalue{font-size:20px;color:var(--muted);word-break:break-all}.lab-result.final .lab-rvalue{color:var(--green);font-size:24px}
.lab-rdetail{font-size:12px;color:var(--muted);word-break:break-word}
.lab-code{background:#172537;color:#dbe7f3;border-radius:8px;padding:10px 0;max-height:420px;overflow:auto;font:12px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace}
.lab-line{display:flex;gap:10px;padding:0 10px 0 0;border-left:3px solid transparent;white-space:pre;width:max-content;min-width:100%}
.lab-line span{width:28px;text-align:right;color:#7f93a8;flex:none}.lab-line code{font:inherit;background:none;color:inherit;padding:0}
.lab-line.on{background:#2c5546;border-left-color:#5eead4}
.lab-codehint{font-size:12px;color:var(--muted);margin:8px 0 0}
/* 视图 */
.v-block{min-width:0}
.v-label{font-size:12px;font-weight:700;color:var(--muted);margin-bottom:6px}
.v-empty{font-size:13px;color:var(--muted);border:1px dashed var(--line);border-radius:6px;padding:10px;text-align:center}
.v-scroll{overflow-x:auto;padding-bottom:4px}
.v-array{display:flex;gap:6px;overflow-x:auto;padding:4px 2px 2px}
.v-cellwrap{display:flex;flex-direction:column;align-items:center;min-width:44px;padding:4px 2px;border-radius:6px}
.v-cellwrap.v-inwin{background:#eef4fb}.v-cellwrap.v-winl{box-shadow:inset 2px 0 0 var(--blue)}.v-cellwrap.v-winr{box-shadow:inset -2px 0 0 var(--blue)}.v-cellwrap.v-winl.v-winr{box-shadow:inset 2px 0 0 var(--blue),inset -2px 0 0 var(--blue)}
.v-cell{min-width:42px;height:42px;padding:0 6px;display:flex;align-items:center;justify-content:center;border:1.5px solid #cbd5e1;border-radius:6px;font:700 15px ui-monospace,Menlo,monospace;background:#fff;transition:all .2s}
.v-compact .v-cellwrap{min-width:34px}.v-compact .v-cell{min-width:32px;height:34px;font-size:13px}
.v-idx{font-size:11px;color:#94a3b8;margin-top:3px}
.v-sub{font-size:11px;color:var(--blue);margin-top:2px;white-space:nowrap}
.v-ptr{display:flex;flex-direction:column;align-items:center;min-height:14px}
.v-ptr span{font-size:11px;font-weight:700;color:var(--amber);white-space:nowrap}
.v-cur{border:2px dashed var(--amber)!important;background:var(--amber-bg)!important;color:var(--amber)}
.v-done{border-color:var(--green)!important;background:var(--pale)!important;color:var(--green)}
.v-hit{border-color:var(--green)!important;background:var(--green)!important;color:#fff!important}
.v-read{border-color:var(--purple)!important;box-shadow:inset 0 -3px 0 var(--purple);color:var(--purple)}
.v-bad{border-color:var(--red)!important;background:#fdeeee!important;color:var(--red)}
.v-dim{opacity:.45}
.v-new{border-color:var(--blue)!important;background:#eef4fb!important;color:var(--blue)}
.v-map,.v-vars{display:flex;flex-wrap:wrap;gap:6px}
.v-pair,.v-var{display:flex;align-items:center;gap:6px;border:1.5px solid #cbd5e1;border-radius:6px;padding:6px 10px;font:13px ui-monospace,Menlo,monospace;background:#fff}
.v-var span{color:var(--muted);font-size:12px}.v-var.v-hit span,.v-pair.v-hit span{color:#e6fff4}.v-var b{font-size:14px}
.v-arrow{color:#94a3b8}
.v-list{display:flex;align-items:flex-start;gap:4px;overflow-x:auto;padding:4px 2px}
.v-lnode-wrap{display:flex;flex-direction:column;align-items:center}
.v-lnode{min-width:42px;height:42px;border:1.5px solid #cbd5e1;border-radius:21px;display:flex;align-items:center;justify-content:center;font:700 14px ui-monospace,Menlo,monospace;background:#fff;padding:0 8px}
.v-null{height:42px;display:flex;align-items:center;font:12px ui-monospace,Menlo,monospace;color:var(--muted);border:1.5px dashed #cbd5e1;border-radius:6px;padding:0 8px}
.v-link{height:42px;display:flex;align-items:center;color:#94a3b8;font-weight:700}
.v-link.v-cur{border:0!important;background:none!important;color:var(--amber)}.v-link.v-bad{border:0!important;background:none!important;text-decoration:line-through}.v-link.v-done{border:0!important;background:none!important}
.v-cycle{font-size:12px;color:var(--purple);margin-top:4px}
.v-tree,.v-graph{display:block;margin:0 auto;max-width:none}
.t-edge,.g-edge{stroke:#cbd5e1;stroke-width:2}
.t-edge.v-cur,.g-edge.v-cur{stroke:var(--amber);stroke-dasharray:5 3}.t-edge.v-done,.g-edge.v-done{stroke:var(--green)}.g-edge.v-read{stroke:var(--purple)}.g-edge.v-bad{stroke:var(--red)}
.t-node circle{fill:#fff;stroke:#94a3b8;stroke-width:2}.t-node text{font:700 13px ui-monospace,Menlo,monospace;text-anchor:middle;fill:var(--ink)}
.t-node text.t-note{font:11px system-ui,sans-serif;fill:var(--blue);font-weight:600}
.t-node.v-cur circle{stroke:var(--amber);stroke-dasharray:4 2;fill:var(--amber-bg)}
.t-node.v-done circle{stroke:var(--green);fill:var(--pale)}
.t-node.v-hit circle{stroke:var(--green);fill:var(--green)}.t-node.v-hit text:not(.t-note){fill:#fff}
.t-node.v-read circle{stroke:var(--purple);fill:#f5f3ff}
.t-node.v-bad circle{stroke:var(--red);fill:#fdeeee}
.t-node.v-dim{opacity:.4}
.t-node.v-new circle{stroke:var(--blue);fill:#eef4fb}
.v-grid{border-collapse:separate;border-spacing:3px;margin:0 auto}
.v-grid td,.v-grid th{width:40px;min-width:0;height:38px;text-align:center;font:600 13px ui-monospace,Menlo,monospace;border-radius:5px;position:relative;padding:0 4px}
.v-grid td{border:1.5px solid #cbd5e1;background:#fff}.v-grid th{color:var(--muted);font-size:11px;background:#f8fafc}
.v-grid td small{position:absolute;right:2px;bottom:0;font-size:9px;color:var(--amber)}
.v-grid.v-small td,.v-grid.v-small th{width:30px;height:28px;font-size:11px}
.v-grid td.v-land{background:#d9f0e3;border-color:#9cd3b6}.v-grid td.v-water{background:#e3eefb;border-color:#b7cfe9;color:#7d9cc0}
.v-grid td.v-path{background:#fef3c7;border-color:#f59e0b}
.v-stack{display:flex;align-items:center;gap:6px;overflow-x:auto;padding:4px 2px;border:1.5px solid #cbd5e1;border-radius:8px;background:#f8fafc;padding:8px}
.v-stack.v-stack{border-right:3px solid var(--blue)}
.v-sitem{min-width:40px;height:40px;padding:0 8px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:1.5px solid #cbd5e1;border-radius:6px;background:#fff;font:700 14px ui-monospace,Menlo,monospace;white-space:nowrap}
.v-sitem small{font:10px system-ui;color:var(--muted)}
.v-end{font-size:11px;color:var(--muted);white-space:nowrap}
.v-bars{display:flex;gap:4px;align-items:flex-end;min-width:min-content}
.v-barcol{display:flex;flex-direction:column;align-items:center;min-width:30px}
.v-barstack{display:flex;flex-direction:column-reverse;justify-content:flex-start;width:26px;position:relative}
.v-bar{background:#94a3b8;border-radius:3px 3px 0 0;width:100%;transition:height .2s}
.v-bar.v-cur{background:var(--amber)!important;border:0!important}.v-bar.v-done{background:var(--green)!important}.v-bar.v-read{background:var(--purple)!important;box-shadow:none}.v-bar.v-bad{background:var(--red)!important}.v-bar.v-hit{background:var(--green)!important}.v-bar.v-new{background:var(--blue)!important}
.v-water{background:#93c5fd;width:100%;font-size:10px;color:#1e3a8a;text-align:center;overflow:hidden}
.v-area{position:absolute;bottom:0;left:-2px;right:-2px;background:rgba(9,134,94,.16);border-top:2px solid var(--green)}
.v-barval{font:600 11px ui-monospace,Menlo,monospace;margin-top:3px}
.v-compare{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.v-option{border:1.5px solid var(--line);border-radius:8px;padding:12px 14px;background:#f8fafc;display:flex;flex-direction:column;gap:4px}
.v-option b{font-size:15px}.v-option span{font-size:12px;color:var(--muted)}.v-option strong{font-size:22px;font-family:ui-monospace,Menlo,monospace}
.v-option.v-win{border-color:var(--green);background:var(--pale)}.v-option.v-win strong{color:var(--green)}
.v-option.v-lose{opacity:.6}.v-option.v-cur{border-style:dashed}
.v-note{border:1px dashed #c4b5fd;background:#faf8ff;border-radius:8px;padding:10px 12px;font:13px/1.6 ui-monospace,Menlo,monospace;color:#4c1d95;white-space:pre-wrap;word-break:break-word}
.v-note.v-done{border:1px solid #9cd3b6;background:var(--pale);color:#065f46}.v-note.v-bad{border:1px solid #f0b7b7;background:#fdeeee;color:var(--red)}
.v-row{display:flex;flex-wrap:wrap;gap:14px}.v-row>*{flex:1 1 200px}
.v-intervals{display:flex;flex-direction:column;gap:6px}
.v-iv-row{display:flex;align-items:center;gap:8px}.v-iv-name{width:56px;font-size:11px;color:var(--muted);text-align:right;flex:none}
.v-iv-track{position:relative;height:26px;flex:1;background:#f8fafc;border-radius:4px}
.v-iv{position:absolute;top:3px;height:20px;background:#cbd5e1;border-radius:4px;display:flex;align-items:center;justify-content:center;font:11px ui-monospace,Menlo,monospace;white-space:nowrap;border:1.5px solid #94a3b8}
.v-iv-axis{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-left:64px}
@media(max-width:620px){.lab-input,.lab-stage,.lab-side{padding:13px}.lab-controls button{padding-left:10px;padding-right:10px}}
@media(prefers-reduced-motion:reduce){.v-cell,.v-bar,.lab-bar i{transition:none}}
.v-link.v-rev{transform:scaleX(-1);color:var(--green)}.v-link.v-cut{color:#e2e8f0}
.v-grid td.v-sunk{background:#f1f5f9;border-color:#cbd5e1;color:#94a3b8}
/* 代码语言切换 */
.code-langs,.lab-langs{display:flex;flex-wrap:wrap;gap:4px;margin:0 0 8px}
.code-langs button,.lab-langs button{font-family:inherit;font-size:12px;line-height:1.2;min-height:30px;padding:5px 9px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);cursor:pointer}
.code-langs button[aria-pressed="true"],.lab-langs button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.code-langs button:focus-visible,.lab-langs button:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.lab-code,#source,pre{tab-size:4;-moz-tab-size:4}.stmt-lead{color:var(--muted);font-size:14px;border-left:3px solid var(--line);padding-left:12px}.stmt-body p{overflow-wrap:anywhere}.ic{font:13px ui-monospace,SFMono-Regular,Consolas,monospace;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:4px;padding:1px 5px;overflow-wrap:anywhere}.stmt-ex{margin:20px 0}.stmt-ex>b{display:block;font-size:14px;margin-bottom:8px}.ex-k{color:var(--muted)}.stmt-explain{font-size:14px;margin:8px 0 0;color:#334155;overflow-wrap:anywhere}.stmt-h{margin-top:24px}.stmt-cons{margin:0 0 15px;padding-left:22px}.stmt-cons li{margin:4px 0;overflow-wrap:anywhere}.stmt-follow{background:#fff8eb;border-left:3px solid var(--amber);padding:12px 16px;border-radius:0 6px 6px 0;font-size:14px}.stmt-note{font-size:12px;color:var(--muted);margin-top:18px}
.side-links{margin:0 0 10px;font-size:12px;line-height:1.9}.side-links a{white-space:nowrap}