@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:100 800;font-display:swap;src:url(../media/258bd0ab5fdd762a-s.2f7nqdagzwx2-.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:100 800;font-display:swap;src:url(../media/99a2019bdfa8519b-s.176arc174-8zp.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:100 800;font-display:swap;src:url(../media/44e0cb21b0d052b7-s.0bp8oijd_gu96.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:100 800;font-display:swap;src:url(../media/f9cd5a77d065db98-s.1fby2rem9ngyr.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:100 800;font-display:swap;src:url(../media/954d21e04331b2ae-s.0vfdmo25voy_0.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:100 800;font-display:swap;src:url(../media/53897e768d329f66-s.p.3t6q91iet4nsy.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:JetBrains Mono Fallback;src:local(Arial);ascent-override:75.79%;descent-override:22.29%;line-gap-override:0.0%;size-adjust:134.59%}.WKSKIq_className{font-family:JetBrains Mono,JetBrains Mono Fallback;font-style:normal}.WKSKIq_variable{--font-jbmono:"JetBrains Mono", "JetBrains Mono Fallback"}
:root{--bg-page:#f7f6f2;--bg-surface:#fff;--bg-subtle:#f2f3ef;--text-primary:#202c39;--text-secondary:#526170;--text-muted:#687681;--border-default:#e7e3da;--border-strong:#c9d0cc;--brand-600:#446b62;--brand-700:#34564f;--brand-100:#eaf2ec;--brand-50:#f4f8f4;--focus-ring:#376eab;--info:#2867a0;--info-bg:#eaf3fa;--success:#28734a;--success-bg:#e9f4ec;--warning:#9a5a10;--warning-bg:#fff2dc;--danger:#b43c40;--danger-bg:#fbecee;--paper:var(--bg-page);--paper-raised:var(--bg-surface);--paper-sunken:var(--bg-subtle);--ink:var(--text-primary);--ink-soft:var(--text-secondary);--slate:var(--text-muted);--line:var(--border-default);--line-strong:var(--border-strong);--accent:var(--brand-600);--accent-deep:var(--brand-700);--accent-tint:var(--brand-100);--evt-model:#5b5bd6;--evt-tool:#b25e00;--evt-run:#0e7c7b;--evt-error:#c0392b;--ok:var(--success);--danger-bg-legacy:#fdf1ef;--console-bg:#101820;--console-ink:#c8d3dd;--console-bright:#e8f0f6;--console-line:#1e2b38;--font-ui:var(--font-inter), var(--font-noto-sc), "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;--font-mono:var(--font-jbmono), "SFMono-Regular", ui-monospace, Consolas, "Cascadia Mono", Menlo, monospace;--radius:8px;--radius-lg:12px}*{box-sizing:border-box}html{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}body{background:var(--paper);color:var(--ink);font-family:var(--font-ui);-webkit-font-smoothing:antialiased;margin:0;font-size:15px;line-height:1.55}:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px;border-radius:2px}@media (prefers-reduced-motion:reduce){*,:before,:after{transition:none!important;animation:none!important}}code,.mono{font-family:var(--font-mono);font-size:.92em}.landing{text-align:center;place-items:center;min-height:100vh;padding:48px 24px;display:grid}.landing-card{max-width:620px}.eyebrow{font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin:0 0 22px;font-size:11px}.btn{min-height:40px}.hero-trace{text-align:left;background:var(--console-bg);border-radius:var(--radius-lg);width:fit-content;min-width:400px;font-family:var(--font-mono);gap:5px;margin:36px auto 0;padding:14px 20px 16px;font-size:12.5px;display:grid;box-shadow:0 12px 30px -18px #1c2b3a80}.hero-trace-label{letter-spacing:.14em;text-transform:uppercase;color:#62788c;margin-bottom:4px;font-size:10.5px}.hero-trace .t{color:var(--console-ink)}.hero-trace .t--model{color:#9b9bf0}.hero-trace .t--tool{color:#e0a05e}.hero-trace .t--run{color:#6cc4c3}.landing h1{letter-spacing:-.018em;text-wrap:balance;max-width:16ch;margin:0 auto 16px;font-size:42px;font-weight:640;line-height:1.1}.landing .thesis{color:var(--ink-soft);text-wrap:pretty;max-width:46ch;margin:0 auto 32px;font-size:17px}.landing-actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.stage{margin-top:26px}.stage-head{border-bottom:2px solid var(--line);align-items:baseline;gap:10px;margin-bottom:10px;padding-bottom:6px;display:flex}.stage-id{color:#fff;background:var(--accent);border-radius:4px;padding:2px 7px;font-size:12px;font-weight:700}.stage-head h2{margin:0;font-size:16px;font-weight:640}.stage-blurb{font-family:var(--font-mono);color:var(--slate);margin-left:auto;font-size:11.5px}.stage .path-item{grid-template-columns:1fr auto;padding:10px 14px}.stage .path-body h3{margin:0 0 2px;font-size:14.5px;font-weight:600}.stage .path-body p{color:var(--ink-soft);margin:0;font-size:13px}.path-card{max-width:680px}.path-list{text-align:left;margin:8px 0 0;padding:0;list-style:none}.path-item{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-raised);grid-template-columns:44px 1fr auto;align-items:center;gap:14px;margin:9px 0;padding:15px 16px;display:grid}.path-item.open{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-tint)}.path-item:not(.open){opacity:.62}.path-step{color:var(--accent-deep);background:var(--accent-tint);border-radius:var(--radius);text-align:center;padding:6px 0;font-size:15px}.path-body h2{margin:0 0 3px;font-size:15.5px;font-weight:620}.path-body p{color:var(--ink-soft);margin:0;font-size:13.5px}.path-soon.locked{color:var(--evt-tool);border-color:var(--evt-tool)}.path-soon{font-size:12px;font-family:var(--font-mono);color:var(--slate);border:1px dashed var(--line-strong);border-radius:999px;padding:3px 10px}.btn{appearance:none;border:1px solid var(--line-strong);background:var(--paper-raised);color:var(--ink);font:inherit;border-radius:var(--radius);cursor:pointer;justify-content:center;align-items:center;gap:6px;padding:9px 16px;font-weight:560;transition:background-color .12s,border-color .12s,transform 60ms;display:inline-flex}.btn:hover{border-color:var(--accent);color:var(--accent-deep)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:default;transform:none}.btn--primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn--primary:hover{background:var(--accent-deep);border-color:var(--accent-deep);color:#fff}.btn--ghost{color:var(--ink-soft);background:0 0;border-color:#0000}.btn--ghost:hover{color:var(--accent-deep);background:var(--paper-sunken);border-color:#0000}.btn--sm{padding:5px 10px;font-size:13px;font-weight:520}.token-field{text-align:left;margin-top:28px}.token-field label{font-family:var(--font-ui);color:var(--text-secondary);font-size:12px;font-weight:500;display:block}.token-row{gap:8px;margin-top:7px;display:flex}.token-row input{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper-raised);min-width:240px;color:var(--ink);font:inherit;flex:1;padding:9px 12px}.token-hint{color:var(--slate);margin:8px 0 0;font-size:12.5px}.topbar{flex-wrap:wrap;align-items:baseline;gap:14px;padding:18px 28px 0;display:flex}.topbar h1{letter-spacing:-.01em;margin:0;font-size:19px;font-weight:620}.revision{font-family:var(--font-mono);color:var(--slate);font-size:12px}.tabbar{border-bottom:1px solid var(--line);gap:4px;margin:14px 28px 0;display:flex}.tab{appearance:none;font:inherit;color:var(--slate);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:8px 14px 10px;font-size:14px;font-weight:540}.tab:hover{color:var(--ink)}.tab[aria-current=page]{color:var(--accent-deep);border-bottom-color:var(--accent)}.chip{font-family:var(--font-mono);border:1px solid var(--line-strong);color:var(--slate);background:var(--paper-raised);border-radius:999px;align-items:center;gap:7px;padding:3px 10px;font-size:12px;display:inline-flex}.chip:before{content:"";background:var(--slate);border-radius:50%;width:7px;height:7px}.chip--ok:before{background:var(--ok)}.chip--running{color:var(--evt-model);border-color:var(--evt-model)}.chip--running:before{background:var(--evt-model);animation:1.2s ease-in-out infinite pulse}.chip--failed{color:var(--evt-error);border-color:var(--evt-error)}.chip--failed:before{background:var(--evt-error)}@keyframes pulse{50%{opacity:.35}}.notice{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:var(--radius);background:var(--accent-tint);color:var(--accent-deep);margin:0 0 16px;padding:9px 14px;font-size:14px}.alert-bar{border:1px solid var(--evt-error);border-radius:var(--radius);color:#7c2419;background:#fdf1ef;flex-wrap:wrap;align-items:center;gap:14px;margin:0 0 16px;padding:11px 14px;font-size:14px;display:flex}.alert-bar .btn{padding:5px 12px;font-size:13px}.learn-split{grid-template-columns:minmax(340px,68ch) minmax(0,1fr);align-items:start;gap:36px;display:grid}.lesson-col h2{letter-spacing:-.01em;margin:0 0 6px;font-size:26px}.lesson-meta{font-family:var(--font-mono);color:var(--slate);margin:0 0 24px;font-size:12px}.lesson-col h3{font-size:13px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.12em;color:var(--accent-deep);margin:30px 0 10px}.lesson-col .objectives{margin:0;padding-left:0;list-style:none}.lesson-col .objectives li{margin:7px 0;padding-left:26px;position:relative}.lesson-col .objectives li:before{content:"→";color:var(--accent);font-family:var(--font-mono);position:absolute;left:2px}.prose p{margin:0 0 13px}.prose h3.md{font-family:var(--font-ui);text-transform:none;letter-spacing:0;color:var(--ink);margin:24px 0 8px;font-size:17px}.prose ul{margin:0 0 13px;padding-left:22px}.prose li{margin:4px 0}.prose .md-code{font-family:var(--font-mono);background:var(--paper-sunken);border:1px solid var(--line);border-radius:4px;padding:1px 5px;font-size:.88em}.prose strong{font-weight:640}.quiz{margin:0;padding:0;list-style:none}.quiz li{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-raised);margin:10px 0;padding:12px 16px}.quiz p{margin:0 0 8px;font-weight:540}.quiz .answer{border-left:3px solid var(--accent);background:var(--accent-tint);border-radius:0 var(--radius) var(--radius) 0;color:var(--accent-deep);margin:8px 0 0;padding:8px 12px;font-size:14px}.practice{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-raised);padding:14px 16px}.practice-meta{font-family:var(--font-mono);color:var(--slate);margin:0 0 10px;font-size:13px}.practice-label{font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.1em;color:var(--slate);margin:12px 0 4px;font-size:12px}.practice-prompt-head{justify-content:space-between;align-items:center;gap:10px;display:flex}.practice-prompt-head .practice-label{margin:12px 0 6px}.practice-copy-error{color:var(--evt-error);margin:0 0 6px;font-size:13px}.practice-prompt pre{background:var(--paper-sunken);border:1px solid var(--line);border-radius:var(--radius);font-family:var(--font-mono);white-space:pre-wrap;word-break:break-word;margin:0;padding:12px 14px;font-size:13px;line-height:1.55}.practice-task{margin:0}.practice-list{margin:0;padding-left:0;list-style:none}.practice-list li{margin:5px 0;padding-left:24px;position:relative}.practice-list li:before{font-family:var(--font-mono);color:var(--accent);position:absolute;left:2px}.practice-list--deliverables li:before{content:"→"}.practice-list--acceptance li:before{content:"✓"}.code-pane{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-raised);overflow:hidden}.pane-head{border-bottom:1px solid var(--line);background:var(--paper-sunken);justify-content:space-between;align-items:center;gap:10px;padding:9px 14px;display:flex}.pane-title{font-family:var(--font-mono);color:var(--slate);font-size:12px}.pane-actions{flex-wrap:wrap;gap:8px;display:flex}.editor-frame{height:340px}.editor-frame .monaco-editor,.editor-frame .monaco-editor .overflow-guard{height:100%!important}.console{background:var(--console-bg);min-height:92px;max-height:200px;color:var(--console-ink);font-family:var(--font-mono);white-space:pre-wrap;margin:0;padding:12px 14px;font-size:12.5px;line-height:1.6;overflow:auto}.console:empty:before,.console.placeholder:before{content:"No output yet — run the workspace to see it here.";color:#5d7186}.console-label{font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:#62788c;background:var(--console-bg);padding:6px 14px 0;font-size:11px;display:block}.build-split{grid-template-columns:230px minmax(0,1fr);align-items:start;gap:22px;display:grid}.filetree{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-raised);padding:8px}.filetree ul{margin:0;padding:0;list-style:none}.filetree li{margin:1px 0}.filetree button{appearance:none;text-align:left;width:100%;font:inherit;font-family:var(--font-mono);color:var(--ink);border-radius:var(--radius);cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:center;gap:8px;padding:6px 9px;font-size:13px;display:flex}.filetree button:hover{background:var(--paper-sunken)}.filetree button[aria-current=true]{background:var(--accent-tint);color:var(--accent-deep);font-weight:600}.filetree .dirty-mark{color:var(--evt-tool);font-weight:700}.mode-switch{border:1px solid var(--line-strong);border-radius:999px;margin-left:auto;display:inline-flex;overflow:hidden}.mode-btn{appearance:none;font:inherit;color:var(--slate);cursor:pointer;background:0 0;border:none;padding:5px 14px;font-size:13px;font-weight:540}.mode-btn:hover{color:var(--ink)}.mode-btn.active{background:var(--accent);color:#fff}.diagram{background:var(--paper-raised);padding:18px 20px 8px}.diagram-head{justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:6px;display:flex}.diagram-title{font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--slate);font-size:12px}.diagram-steps{color:var(--accent-deep);background:var(--accent-tint);border-radius:999px;padding:2px 10px;font-size:12.5px}.diagram-hint{color:var(--ink-soft);margin:4px 0 10px;font-size:14px}.diagram svg{width:100%;height:auto;display:block}.diagram-node-label{fill:var(--ink);font-size:15px;font-weight:600}.diagram-node-sub{fill:var(--slate);font-size:10.5px;font-family:var(--font-mono)}.diagram-node.active rect{animation:1.4s ease-in-out infinite diagram-pulse}.diagram-edge-label{fill:var(--slate);font-size:11px}.diagram-edge.active{stroke-dasharray:7 5;animation:.9s linear infinite diagram-flow}.diagram-bubble{fill:#fff7ec;stroke:var(--evt-tool)}.diagram-bubble-text{fill:var(--ink);font-size:12px}.diagram-bubble-sub{fill:var(--slate);font-size:10px}@keyframes diagram-flow{to{stroke-dashoffset:-12px}}@keyframes diagram-pulse{50%{opacity:.75}}.stage-flow{flex-wrap:wrap;align-items:stretch;gap:0;margin:10px 0 6px;padding:0;list-style:none;display:flex}.stage-card{border:1.5px solid var(--line-strong);border-radius:var(--radius-lg);background:var(--paper-raised);flex:150px;align-content:start;gap:3px;min-width:150px;max-width:220px;margin-right:18px;padding:12px 14px 12px 16px;display:grid;position:relative}.stage-card:last-child{margin-right:0}.stage-card:not(:last-child):after{content:"→";color:var(--accent);font-size:15px;font-weight:700;position:absolute;top:50%;right:-16px;transform:translateY(-50%)}.stage-card.done{border-color:var(--accent);background:var(--accent-tint)}.stage-card.active{border-color:var(--accent);background:var(--accent-tint);box-shadow:0 0 0 3px var(--accent-tint);animation:1.4s ease-in-out infinite diagram-pulse}.stage-step{color:var(--accent-deep);font-size:10px}.stage-card-label{font-size:14.5px;font-weight:620}.stage-card-sub{font-size:11.5px;font-family:var(--font-mono);color:var(--slate)}.stage-card-detail{color:var(--ink-soft);font-size:11.5px}.stage-points{color:var(--accent-deep);margin:6px 0 0;padding-left:14px;font-size:11.5px}.stage-points li{margin:2px 0;list-style-type:"✓ "}.challenge-card{border:1px solid var(--accent);border-radius:var(--radius-lg);background:var(--accent-tint);margin:12px 14px 0;padding:10px 14px}.challenge-head{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.challenge-title{color:var(--accent-deep);align-items:center;gap:6px;font-size:13px;font-weight:700;display:inline-flex}.challenge-title svg{color:var(--accent)}.challenge-done{color:#fff;background:var(--ok);border-radius:999px;align-items:center;gap:4px;padding:2px 10px;font-size:12px;font-weight:700;display:inline-flex}.challenge-objectives{color:var(--ink);gap:2px;margin:0 0 8px;padding-left:18px;font-size:13px;display:grid}.challenge-step{color:var(--accent-deep);margin-right:4px}.challenge-flow{color:var(--ink-soft);flex-wrap:wrap;align-items:center;gap:6px;font-size:12px;display:flex}.challenge-stage{border:1px solid var(--line-strong);background:var(--paper-raised);border-radius:999px;padding:2px 10px}.challenge-stage.done{border-color:var(--ok);color:var(--ok);font-weight:700}.challenge-arrow{color:var(--accent);font-weight:700}.assessment-panel{border:1px solid var(--evt-tool);border-radius:var(--radius-lg);background:#fffaf3;margin:12px 14px 0;padding:10px 14px}.assessment-panel.passed{border-color:var(--ok);background:#f3fbf5}.assessment-head{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:6px;display:flex}.assessment-badge{border-radius:999px;align-items:center;gap:5px;padding:3px 12px;font-size:13px;font-weight:700;display:inline-flex}.assessment-badge.done{background:var(--ok);color:#fff}.assessment-badge.fail{color:var(--evt-error);border:1px solid var(--evt-error);background:#fdf1ef}.assessment-score{color:var(--ink-soft);font-size:12px}.assessment-checks{gap:3px;margin:0;padding:0;list-style:none;display:grid}.check{align-items:center;gap:8px;font-size:13px;display:flex}.check-mark{flex:none;display:inline-flex}.check.pass .check-mark{color:var(--ok)}.check.fail .check-mark,.check.fail .check-name{color:var(--evt-error)}.assessment-hint{color:var(--ink-soft);margin:6px 0 0;font-size:12px}.assessment-hint.ok{color:var(--ok)}.scorecard{border:1px solid var(--console-line);border-radius:var(--radius);background:var(--console-line);margin-bottom:10px;padding:8px 10px}.scorecard-title{color:var(--console-bright);align-items:center;gap:6px;margin-bottom:6px;font-size:12px;font-weight:600;display:flex}.scorecard.compact{border:none;border-top:1px dashed var(--console-line);background:0 0;margin:0;padding:8px 0 0}.scorecard-list{gap:3px;margin:0;padding:0;list-style:none;display:grid}.scorecard-item{color:var(--console-ink);align-items:center;gap:8px;font-size:12px;display:flex}.scorecard-mark{flex:none;display:inline-flex}.scorecard-item.hit .scorecard-mark{color:#7ee2a8}.scorecard-item.miss .scorecard-mark{color:#ff9d9d}.scorecard-element{min-width:3em;color:var(--console-bright);font-weight:600}.scorecard-advice{color:var(--console-ink)}.scorecard-item.miss .scorecard-advice{color:#ffd9a8}.mini-file-chip.ab-start{border-color:var(--accent);color:var(--accent-deep);margin-left:auto;font-weight:600}.ab-banner{color:var(--accent-deep);background:var(--accent-tint);border-bottom:1px solid var(--line);align-items:center;gap:6px;margin:0;padding:8px 12px;font-size:12px;display:flex}.ab-banner svg{color:var(--accent);flex:none}.ab-compare{border:1px solid var(--line-strong);border-radius:var(--radius-lg);margin:12px 14px 0;overflow:hidden}.ab-verdict{background:var(--accent-tint);color:var(--accent-deep);flex-wrap:wrap;align-items:baseline;gap:10px;padding:10px 14px;font-size:14px;display:flex}.ab-verdict-sub{color:var(--ink-soft);font-size:12px}.ab-panels{grid-template-columns:1fr 1fr;display:grid}.ab-panel{border-right:1px solid var(--line);background:var(--paper-raised);padding:12px 14px}.ab-panel:last-child{border-right:none}.ab-panel.winner{box-shadow:inset 0 3px 0 var(--ok);background:#f3fbf5}.ab-panel-head{align-items:center;gap:8px;margin-bottom:8px;display:flex}.ab-badge{background:var(--ink);color:#fff;border-radius:50%;place-items:center;width:22px;height:22px;font-size:12px;font-weight:700;display:inline-grid}.ab-score{font-family:var(--font-mono);color:var(--accent-deep);font-size:12px}.ab-win-tag{color:#fff;background:var(--ok);border-radius:999px;padding:2px 8px;font-size:11px;font-weight:700}.ab-features{flex-wrap:wrap;gap:5px;margin:0;padding:0;list-style:none;display:flex}.ab-feature{border-radius:999px;padding:2px 9px;font-size:11.5px}.ab-feature.hit{background:var(--accent-tint);color:var(--accent-deep)}.ab-feature.miss{color:var(--evt-error);background:#fdf1ef}@media (max-width:900px){.ab-panels{grid-template-columns:1fr}}.mini-editor{border:1px solid var(--line-strong);border-radius:var(--radius-lg);margin:12px 14px 0;overflow:hidden}.mini-editor-head{background:var(--paper-sunken);border-bottom:1px solid var(--line);flex-wrap:wrap;gap:6px;padding:8px 10px;display:flex}.mini-file-chip{appearance:none;border:1px solid var(--line-strong);background:var(--paper-raised);font:inherit;font-family:var(--font-mono);color:var(--ink);cursor:pointer;border-radius:999px;padding:4px 12px;font-size:12px}.mini-file-chip.selected{background:var(--accent);border-color:var(--accent);color:#fff}.mini-editor-frame{height:220px}.mini-editor-hint{color:var(--slate);background:var(--paper-sunken);margin:0;padding:6px 12px 8px;font-size:11.5px}.stdout-line.new{border-left:3px solid var(--ok);background:#2ea04338;margin-left:-7px;padding-left:4px;display:inline}.run-input-delta{flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:10px;display:flex}.run-delta-label{letter-spacing:.08em;text-transform:uppercase;color:#62788c;font-size:11px}.run-delta-chip{font-family:var(--font-mono);color:var(--console-bright);background:var(--console-line);border-radius:999px;padding:3px 10px;font-size:11.5px}.run-delta-chip .up,.run-metric-value .up{color:#7ee2a8}.run-delta-chip .down,.run-metric-value .down{color:#ff9d9d}.run-delta-note{color:#7ee2a8;margin-left:6px;font-size:11.5px}.run-output{background:var(--console-bg);border-radius:0 0 var(--ex-radius-lg) var(--ex-radius-lg);padding:12px 14px}.run-output.empty{background:var(--paper-raised);border:1px dashed var(--line-strong)}.run-output-empty{color:var(--slate);margin:0;font-size:13px}.run-metrics{flex-wrap:wrap;gap:8px;margin-bottom:10px;display:flex}.run-metric{border-radius:var(--radius);background:var(--console-line);color:var(--console-ink);gap:2px;padding:6px 12px;display:inline-grid}.run-metric.good{border:1px solid var(--ok)}.run-metric.warn{border:1px solid var(--evt-tool)}.run-metric.bad{border:1px solid var(--evt-error)}.run-metric-label{letter-spacing:.08em;text-transform:uppercase;color:#62788c;font-size:10.5px}.run-metric-value{color:var(--console-bright);font-size:14px;font-weight:620}.run-events{gap:3px;margin:0 0 8px;padding:0;list-style:none;display:grid}.run-event{color:var(--console-ink);align-items:baseline;gap:8px;font-size:12.5px;display:flex}.run-event-icon{color:var(--console-ink);flex:none;align-self:center}.run-event-seq{color:#62788c;min-width:3em}.run-event-text{color:var(--console-bright)}.run-raw summary{cursor:pointer;color:#62788c;-webkit-user-select:none;user-select:none;font-size:12px}.run-raw .console{border-radius:var(--radius);max-height:180px;margin-top:6px}.inspect-split{grid-template-columns:minmax(320px,480px) minmax(0,1fr);align-items:start;gap:26px;display:grid}.trace-runline{color:var(--ink-soft);flex-wrap:wrap;align-items:center;gap:12px;margin:0 0 18px;font-size:14px;display:flex}.trace-runline .mono{color:var(--ink);background:var(--paper-sunken);border-radius:4px;padding:2px 7px}.trace-empty{color:var(--slate);border:1px dashed var(--line-strong);border-radius:var(--radius-lg);padding:26px;font-size:14px}.trace{margin:0;padding:0 0 0 26px;list-style:none;position:relative}.trace:before{content:"";background:var(--line);border-radius:1px;width:2px;position:absolute;top:10px;bottom:10px;left:9px}.trace li{margin:1px 0;position:relative}.trace-item{appearance:none;width:100%;font:inherit;font-family:var(--font-mono);color:var(--ink);text-align:left;border-radius:var(--radius);cursor:pointer;background:0 0;border:1px solid #0000;align-items:center;gap:10px;padding:5px 10px;font-size:13px;display:flex}.trace-item:hover{background:var(--paper-sunken)}.trace-item[aria-pressed=true]{background:var(--accent-tint);border-color:var(--accent);color:var(--accent-deep)}.trace-item:before{content:"";border:2px solid var(--paper);background:currentColor;border-radius:3px;width:10px;height:10px;position:absolute;left:-22px;box-shadow:0 0 0 1px}.trace-item .seq{color:var(--slate);text-align:right;min-width:4.5ch;margin-right:2px;display:inline-block}.trace-item .evt--model{color:var(--evt-model)}.trace-item .evt--tool{color:var(--evt-tool)}.trace-item .evt--run,.trace-item .evt--agent{color:var(--evt-run)}.trace-item .evt--error{color:var(--evt-error)}.trace-item .evt--stream{color:var(--slate)}.trace-detail{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-raised);padding:18px 20px;position:sticky;top:16px}.trace-detail h3{font-family:var(--font-mono);margin:0 0 2px;font-size:16px}.trace-detail .detail-meta{font-family:var(--font-mono);color:var(--slate);margin:0 0 14px;font-size:12px}.trace-detail pre{background:var(--console-bg);color:var(--console-bright);border-radius:var(--radius);font-family:var(--font-mono);margin:0;padding:14px;font-size:12.5px;line-height:1.6;overflow:auto}.trace-detail .placeholder{color:var(--slate);font-family:var(--font-ui)}.flow-blocks{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-raised);gap:8px;margin:12px 14px 0;padding:10px 14px;display:grid}.flow-blocks__hint{color:var(--slate);margin:0;font-size:12px}.flow-step{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);align-items:center;gap:8px;padding:6px 8px;display:flex}.flow-step:focus-within,.flow-step--active{border-color:var(--accent)}.flow-step--active{box-shadow:0 0 0 2px var(--accent-tint)}.flow-step__handle{color:var(--slate);cursor:grab;touch-action:none;background:0 0;border:none;align-items:center;padding:0 2px;display:inline-flex}.flow-step__index{text-align:right;min-width:18px;font-family:var(--font-mono);color:var(--slate);font-size:12px}.flow-step__input{font:inherit;color:var(--ink);background:0 0;border:none;flex:1;min-width:0}.flow-step__input:focus{outline:none}.flow-step__btn{color:var(--slate);cursor:pointer;background:0 0;border:none;align-items:center;padding:2px 4px;display:inline-flex}.flow-step__btn:hover:not(:disabled),.flow-step__handle:hover{color:var(--ink)}.flow-step__btn:disabled{opacity:.35;cursor:default}.flow-settings{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-sunken);align-items:center;gap:18px;padding:8px 10px;font-size:13px;display:flex}.flow-settings--active{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-tint)}.flow-settings__toggle{align-items:center;gap:6px;display:flex}.flow-settings__fixes{color:var(--ink-soft);align-items:center;gap:8px;display:flex}.flow-settings__fixes button{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper-raised);cursor:pointer;padding:0 8px}.flow-settings__fixes button:disabled{opacity:.35;cursor:default}.flow-blocks__unknown{color:var(--slate);margin:0;font-size:12px}.workbench{grid-template-columns:250px minmax(0,1fr) minmax(300px,380px);align-items:start;gap:14px;padding:14px;display:grid}.wb-task{gap:12px;display:grid;position:sticky;top:14px}.wb-task .challenge-card{margin:0}.wb-task__learn{width:100%}.wb-task__tip{color:var(--slate);border-top:1px dashed var(--line-strong);margin:0;padding-top:10px;font-size:12px}.wb-main{gap:12px;min-width:0;display:grid}.wb-main .pane-head,.wb-main .mini-editor{margin-left:0;margin-right:0}.wb-result{gap:12px;min-width:0;display:grid;position:sticky;top:14px}.wb-result__summary{border:1px solid var(--accent);border-radius:var(--radius-lg);background:var(--accent-tint);color:var(--accent-deep);padding:10px 14px;font-size:13px;line-height:1.6}.mini-file-select{color:var(--slate);align-items:center;gap:8px;font-size:12px;display:flex}.mini-file-select select{font:inherit;font-family:var(--font-mono);border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper-raised);color:var(--ink);max-width:220px;padding:3px 6px}.wb-view-toggle{gap:4px;display:inline-flex}.teacher-view{gap:10px;display:grid}.teacher-view__note{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-sunken);color:var(--ink-soft);align-items:flex-start;gap:8px;margin:0;padding:10px 14px;font-size:13px;line-height:1.6;display:flex}.teacher-view__note svg{color:var(--accent);flex:none;margin-top:3px}.teacher-view__code{min-height:260px}.lab-section{gap:8px;display:grid}.lab-section__title{color:var(--ink-soft);align-items:center;gap:8px;margin:0;font-size:13px;font-weight:700;display:flex}.lab-section__file{font-family:var(--font-mono);color:var(--slate);background:var(--paper-sunken);border:1px solid var(--line);border-radius:999px;padding:1px 8px;font-size:11px;font-weight:400}.lab-fields{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:8px;display:grid}.lab-field{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-sunken);color:var(--ink);align-items:center;gap:8px;padding:7px 10px;font-size:13px;display:flex}.lab-field--wide{grid-column:1/-1}.lab-field select{font:inherit;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper-raised);padding:2px 4px}.lab-field button{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper-raised);cursor:pointer;padding:0 8px}.lab-field button:disabled{opacity:.35;cursor:default}.lab-field__input{font:inherit;color:var(--ink);background:0 0;border:none;flex:1;min-width:0}.lab-field__input:focus{outline:none}.lab-list{gap:6px;display:grid}.lab-list__label{color:var(--slate);font-size:12px}.lab-code{color:var(--slate);gap:4px;font-size:12px;display:grid}.lab-code textarea{border:1px solid var(--line);border-radius:var(--radius);background:var(--console-bg);color:var(--console-ink);font-family:var(--font-mono);resize:vertical;padding:8px;font-size:12.5px;line-height:1.6}@media (max-width:1100px){.learn-split,.inspect-split,.build-split,.workbench{grid-template-columns:1fr}.wb-task,.wb-result{position:static}.filetree ul{flex-wrap:wrap;gap:4px;display:flex}}.ex-root{--ex-bg:var(--bg-page);--ex-panel:var(--bg-surface);--ex-panel-2:var(--bg-subtle);--ex-ink:var(--text-primary);--ex-ink-dim:var(--text-secondary);--ex-ink-bright:var(--text-primary);--ex-line:var(--border-default);--ex-line-strong:var(--border-strong);--ex-accent:var(--brand-600);--ex-green:var(--success);--ex-amber:var(--warning);--ex-red:var(--danger);--ex-canvas:#fafaf7;--ex-radius-xs:3px;--ex-radius-sm:6px;--ex-radius-md:var(--radius);--ex-radius-lg:var(--radius-lg);--ex-pad-page:24px;--ex-gap-col:16px;--ex-pad-panel:16px;--ex-pad-canvas:8px;background:var(--ex-bg);min-height:100vh;color:var(--ex-ink);font-family:var(--font-ui);flex-direction:column;font-size:14px;line-height:1.6;display:flex}.ex-root .mono{font-family:var(--font-mono);color:var(--ex-ink)}.ex-root .ex-dim{color:var(--ex-ink-dim);font-weight:400}.ex-header{border-bottom:1px solid var(--ex-line);background:var(--ex-panel);flex-wrap:wrap;align-items:center;gap:28px;padding:14px 24px;display:flex}.ex-brand{align-items:center;gap:12px;display:flex}.ex-brand-mark{border-radius:var(--ex-radius-md);background:var(--brand-600);color:#fff;flex:none;place-items:center;width:36px;height:36px;display:grid}.ex-brand h1{letter-spacing:-.01em;color:var(--ex-ink-bright);font-size:16px;font-weight:600;font-family:var(--font-ui);margin:0}.ex-brand p{color:var(--ex-ink-dim);margin:2px 0 0;font-size:12px}.ex-now{border-left:3px solid var(--brand-600);flex-direction:column;gap:1px;padding:2px 0 2px 14px;display:flex}.ex-now-label{color:var(--ex-ink-dim);font-size:11px}.ex-now-lesson{color:var(--ex-ink-bright);font-size:14px;font-weight:600}.ex-now-step{color:var(--ex-ink-dim);font-size:12px}.ex-progress{flex-direction:column;gap:5px;min-width:300px;margin-left:auto;display:flex}.ex-progress-label{color:var(--ex-ink-dim);text-align:right;font-size:12px}.ex-progress-segments{gap:2px;display:flex}.ex-progress-segments .seg{border-radius:var(--ex-radius-xs);background:var(--ex-line);flex:1;height:5px}.ex-progress-segments .seg.done{background:var(--brand-600)}.ex-body{flex:1;grid-template-columns:280px minmax(0,1fr) 320px;align-items:start;gap:16px;padding:16px 24px 28px;display:grid}.ex-sidebar{border:1px solid var(--ex-line);background:var(--ex-panel);border-radius:var(--ex-radius-lg);flex-direction:column;max-height:calc(100vh - 120px);display:flex;position:sticky;top:16px}.ex-tabs{border-bottom:1px solid var(--ex-line);flex-wrap:wrap;gap:6px;padding:12px;display:flex}.ex-tab{color:var(--ex-ink-dim);border:1px solid var(--ex-line);border-radius:var(--ex-radius-sm);cursor:pointer;background:0 0;padding:4px 10px;font-family:inherit;font-size:12px;font-weight:500;transition:background-color .12s,color .12s,border-color .12s}.ex-tab:hover{color:var(--ex-ink);border-color:var(--ex-line-strong)}.ex-tab.active{color:var(--text-primary);background:var(--ex-panel-2);border-color:var(--ex-line-strong);font-weight:600}.ex-tab-count{opacity:.75;font-family:var(--font-mono);margin-left:3px;font-size:11px}.ex-lessons{scrollbar-width:thin;scrollbar-color:#d8d4c9 transparent;flex:1;padding:6px 10px 10px;overflow-y:auto}.ex-stage-group{margin-bottom:12px}.ex-stage-group-head{border-bottom:1px solid var(--ex-line);align-items:baseline;gap:8px;padding:8px 4px 6px;display:flex}.ex-stage-id{font-family:var(--font-mono);color:var(--brand-700);background:var(--brand-100);border-radius:var(--ex-radius-xs);padding:1px 6px;font-size:11px;font-weight:700}.ex-stage-theme{color:var(--ex-ink-bright);font-size:13px;font-weight:600}.ex-stage-blurb{color:var(--ex-ink-dim);margin-left:auto;font-size:11px}.ex-lesson-list{margin:4px 0 0;padding:0;list-style:none}.ex-lesson{margin-bottom:2px}.ex-lesson-head{border-radius:var(--ex-radius-md);width:100%;color:var(--ex-ink);cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:8px;padding:7px 8px;font-family:inherit;transition:background-color .12s;display:flex}.ex-lesson-head:hover{background:var(--ex-panel-2)}.ex-lesson-head.open{background:var(--brand-50)}.ex-lesson-dot{width:18px;height:18px;color:var(--text-muted);flex:none;justify-content:center;align-items:center;display:inline-flex}.ex-lesson-dot.done{color:var(--ex-green)}.ex-lesson-count{font-family:var(--font-mono);color:var(--brand-700);background:var(--brand-100);border-radius:var(--ex-radius-xs);justify-content:center;align-items:center;min-width:16px;height:16px;font-size:10.5px;font-weight:600;display:inline-flex}.ex-lesson-title{color:var(--ex-ink-bright);font-size:13.5px;font-weight:600}.ex-lesson-steps{color:var(--ex-ink-dim);font-size:11px;font-family:var(--font-mono);margin-left:auto}.ex-lesson-chevron{color:var(--text-muted);flex:none;display:inline-flex}.ex-step-list{margin:2px 0 6px;padding:0 0 0 24px;list-style:none}.ex-step-btn{text-align:left;width:100%;color:var(--ex-ink-dim);border-radius:0 var(--ex-radius-sm) var(--ex-radius-sm) 0;cursor:pointer;background:0 0;border:none;border-left:2px solid #0000;grid-template-columns:18px 1fr;grid-template-areas:"no name""no summary";column-gap:8px;margin:1px 0;padding:5px 6px 5px 8px;font-family:inherit;font-size:12.5px;transition:background-color .12s,color .12s;display:grid}.ex-step-btn:hover{color:var(--ex-ink);background:var(--ex-panel-2)}.ex-step-btn.seen{color:var(--text-secondary)}.ex-step-btn.active{color:var(--brand-700);background:var(--brand-100);border-left-color:var(--brand-600)}.ex-step-no{color:var(--text-muted);font-family:var(--font-mono);grid-area:no;padding-top:1px;font-size:11px}.ex-step-name{grid-area:name;font-weight:600}.ex-step-summary{opacity:.85;grid-area:summary;font-size:11.5px}.ex-sidebar-foot{border-top:1px solid var(--ex-line);color:var(--ex-ink-dim);padding:10px 14px;font-size:11px}.ex-main{gap:var(--ex-gap-col);flex-direction:column;min-width:0;display:flex}.ex-step-head .ex-eyebrow{color:var(--brand-700);margin:0 0 4px;font-size:12px;font-weight:600}.ex-step-head h2{letter-spacing:0;color:var(--ex-ink-bright);margin:0;font-size:22px;font-weight:600;line-height:30px}.ex-step-head .ex-step-summary{color:var(--brand-700);margin:4px 0 8px;font-size:14.5px;font-weight:500}.ex-step-head .ex-step-explain{color:var(--text-secondary);max-width:78ch;margin:0}.ex-stage{border:1px solid var(--ex-line);background:var(--ex-panel);border-radius:var(--ex-radius-lg);padding:var(--ex-pad-canvas)}.ex-stage svg{width:100%;height:auto;display:block}.ex-rel{margin:0}.ex-rel svg .canvas{fill:var(--ex-canvas)}.ex-rel svg{background:var(--ex-canvas);border-radius:4px}.ex-rel-caption{border-top:1px dashed var(--ex-line);color:var(--text-secondary);margin:10px 0 0;padding:10px 4px 2px;font-size:12px}.ex-rel-caption:before{content:"关系 ";color:var(--brand-700);font-weight:600}.ex-rel-edge{fill:none;stroke:#526170;stroke-width:1.5px;stroke-opacity:.75}.ex-rel-edge--control{stroke-dasharray:4 4}.ex-rel-edge--conflict{stroke:var(--danger);stroke-dasharray:2 4;stroke-opacity:.8}.ex-rel-edge--active{stroke-width:2.2px;stroke-opacity:1;stroke-dasharray:7 5;animation:.5s linear infinite ex-lane-flow}.ex-rel-edge--cat-model{stroke:var(--evt-model)}.ex-rel-edge--cat-tool{stroke:var(--evt-tool)}.ex-rel-edge--cat-lifecycle{stroke:var(--brand-600)}.ex-rel-edge--cat-error{stroke:var(--evt-error)}@keyframes ex-lane-flow{to{stroke-dashoffset:-13px}}.ex-rel-edge-label{fill:var(--text-secondary);paint-order:stroke;stroke:var(--ex-canvas);stroke-width:3px;font-size:10.5px}.ex-rel-edge-label.active{fill:var(--text-primary);font-weight:700}.ex-arrow-fill{fill:#526170;fill-opacity:.75}.ex-rel-node rect,.ex-rel-node circle,.ex-rel-node path{stroke:var(--border-strong)}.ex-rel-node .ex-rel-name{fill:var(--text-primary);paint-order:stroke;stroke:var(--ex-canvas);stroke-width:3px;font-size:12px;font-weight:600}.ex-rel-node .ex-rel-sub{fill:var(--text-secondary);paint-order:stroke;stroke:var(--ex-canvas);stroke-width:3px;font-size:9.5px}.ex-rel-node .ex-rel-value{font-size:10px;font-weight:700;font-family:var(--font-mono);fill:var(--brand-700);paint-order:stroke;stroke:var(--ex-canvas);stroke-width:3px}.ex-rel-node.touched .ex-rel-name{fill:var(--text-primary)}.ex-rel-node.touched rect,.ex-rel-node.touched circle{stroke:var(--brand-600)}.ex-rel-node--box rect{fill:#fff}.ex-rel-node--core circle.ex-rel-ring{fill:#edf4ee;stroke-width:1.5px}.ex-rel-node--core .ex-rel-skin-fill{fill:#fff}.ex-rel-node--core.touched circle.ex-rel-ring{stroke:var(--evt-model);animation:2.4s ease-in-out infinite ex-breathe}.ex-rel-node--person .ex-rel-skin{fill:#fffcf5;stroke:#d9cdb4;stroke-width:1.2px}.ex-rel-node--person .ex-rel-skin-fill{fill:#fffcf5}.ex-rel-node--doc rect{fill:#f0f4f8}.ex-rel-node--doc .ex-rel-doc-fold{fill:#dce5ee}.ex-rel-node--folder rect{fill:#fffcf5;stroke:#d9cdb4}.ex-rel-node--gate .ex-rel-gate{fill:#fff;stroke:var(--border-strong);stroke-width:1.2px}.ex-rel-node--gate .ex-rel-gate-door{stroke:var(--border-strong)}.ex-rel-node--gate .ex-rel-gate--open{stroke:var(--success);fill:var(--success-bg)}.ex-rel-node--gate .ex-rel-gate--blocked{stroke:var(--danger);fill:var(--danger-bg)}.ex-rel-node--meter .ex-rel-meter-frame{fill:#edebe4;stroke:var(--border-default)}.ex-rel-node--meter .ex-rel-meter-fill{fill:var(--ex-green)}.ex-rel-node--stack .ex-rel-stack-bar{fill:var(--brand-100);stroke:var(--brand-600)}@keyframes ex-breathe{0%,to{stroke-opacity:.55}50%{stroke-opacity:1}}.ex-packet{offset-rotate:0deg;animation-name:ex-packet-travel;animation-duration:.7s;animation-timing-function:cubic-bezier(.3,.7,.4,1);animation-fill-mode:forwards}.ex-packet--model{fill:var(--evt-model)}.ex-packet--tool{fill:var(--evt-tool)}.ex-packet--lifecycle{fill:var(--brand-600)}.ex-packet--error{fill:var(--evt-error)}.ex-packet--trail{opacity:.45;animation-delay:.13s}@keyframes ex-packet-travel{0%{offset-distance:0%;opacity:0}12%{opacity:1}82%{opacity:1}to{offset-distance:100%;opacity:.85}}.ex-arrive{fill:none;stroke-width:1.5px;animation:.55s ease-out forwards ex-arrive}.ex-arrive--model{stroke:var(--evt-model)}.ex-arrive--tool{stroke:var(--evt-tool)}.ex-arrive--lifecycle{stroke:var(--brand-600)}.ex-arrive--error{stroke:var(--evt-error)}@keyframes ex-arrive{0%{r:6;opacity:1}to{r:26;opacity:0}}.ex-pulse{animation:1.1s ease-out infinite ex-pulse}.ex-pulse--model{fill:var(--evt-model)}.ex-pulse--tool{fill:var(--evt-tool)}.ex-pulse--lifecycle{fill:var(--brand-600)}.ex-pulse--error{fill:var(--evt-error)}@keyframes ex-pulse{0%{r:4;opacity:1}to{r:16;opacity:0}}.ex-btn{color:var(--text-primary);background:var(--ex-panel);border:1px solid var(--border-strong);border-radius:var(--ex-radius-md);cursor:pointer;justify-content:center;align-items:center;gap:6px;min-height:36px;padding:8px 14px;font-family:inherit;font-size:13px;font-weight:500;transition:background-color .12s,border-color .12s,color .12s;display:inline-flex}.ex-btn:hover:not(:disabled){background:var(--bg-subtle);border-color:var(--brand-600);color:var(--brand-700)}.ex-btn:active:not(:disabled){transform:translateY(1px)}.ex-btn:disabled{opacity:.45;cursor:default}.ex-btn--primary{color:#fff;background:var(--brand-600);border-color:var(--brand-600);font-weight:600}.ex-btn--primary:hover:not(:disabled){color:#fff;background:var(--brand-700);border-color:var(--brand-700)}.ex-btn--block{width:100%;min-height:40px}.ex-rel{position:relative}.ex-playback{z-index:2;border:1px solid var(--ex-line);background:var(--ex-panel);background:color-mix(in srgb, var(--ex-panel) 86%, transparent);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border-radius:999px;align-items:center;gap:3px;padding:4px 7px;display:flex;position:absolute;top:20px;right:20px;box-shadow:0 2px 10px #00000014}.ex-playback .ex-btn{border-radius:999px;width:26px;min-height:26px;padding:0}.ex-playback .ex-btn--primary{width:30px;min-height:30px}.ex-playback-speed{width:auto;font-family:var(--font-mono);padding:0 7px;font-size:11.5px}.ex-playback-progress{color:var(--text-muted);white-space:nowrap;margin-left:5px;font-size:10.5px}.ex-overview{border:1px solid var(--ex-line);background:var(--ex-panel);border-radius:var(--ex-radius-lg);padding:var(--ex-pad-panel);scrollbar-width:thin;scrollbar-color:#d8d4c9 transparent;max-height:calc(100vh - 120px);position:sticky;top:16px;overflow-y:auto}.ex-eyebrow{color:var(--brand-700);font-size:11.5px;font-weight:600}.ex-overview-head h2{color:var(--ex-ink-bright);margin:2px 0 6px;font-size:18px;font-weight:600}.ex-overview-desc{color:var(--text-secondary);margin:0;font-size:13px;line-height:1.65}.ex-facts,.ex-sources,.ex-hands-on{border-top:1px solid var(--ex-line);margin-top:14px;padding-top:12px}.ex-facts h3,.ex-sources h3,.ex-hands-on h3{color:var(--ex-ink-bright);align-items:center;gap:6px;margin:0 0 10px;font-size:12.5px;font-weight:600;display:flex}.ex-facts h3 svg,.ex-sources h3 svg,.ex-hands-on h3 svg{color:var(--brand-600);flex:none}.ex-fact{margin-bottom:10px}.ex-fact dt{color:var(--brand-700);font-size:11px;font-weight:600}.ex-fact dd{color:var(--text-primary);margin:2px 0 0;font-size:13px}.ex-fact-src{color:var(--text-muted);margin-top:2px;font-size:11px;display:block}.ex-sources ul{gap:6px;margin:0;padding:0;list-style:none;display:grid}.ex-sources li{font-size:12px}.ex-sources a{color:var(--brand-700);text-decoration:underline;-webkit-text-decoration-color:var(--border-strong);text-decoration-color:var(--border-strong);text-underline-offset:3px}.ex-sources a:hover{-webkit-text-decoration-color:var(--brand-700);text-decoration-color:var(--brand-700)}.ex-src-icon{color:var(--text-muted);vertical-align:-1px;margin-left:4px}.ex-hint{color:var(--text-secondary);margin:10px 0 0;font-size:12.5px;line-height:1.6}.ex-error{border-radius:var(--ex-radius-sm);background:var(--danger-bg);color:var(--danger);align-items:center;gap:6px;margin:10px 0 0;padding:7px 10px;font-size:12.5px;display:flex}.ex-error svg{flex:none}.ex-rel-edge-glow{fill:none;stroke-width:7px;opacity:.18;stroke-linecap:round}.ex-rel-edge-glow--cat-model{stroke:var(--evt-model)}.ex-rel-edge-glow--cat-tool{stroke:var(--evt-tool)}.ex-rel-edge-glow--cat-lifecycle{stroke:var(--brand-600)}.ex-rel-edge-glow--cat-error{stroke:var(--evt-error)}.ex-packet--halo{opacity:.2}.ex-depart{fill:none;stroke-width:1.5px;animation:.6s ease-out forwards ex-arrive}.ex-depart--model{stroke:var(--evt-model)}.ex-depart--tool{stroke:var(--evt-tool)}.ex-depart--lifecycle{stroke:var(--brand-600)}.ex-depart--error{stroke:var(--evt-error)}.ex-rel-node.dst{transform-box:fill-box;transform-origin:50%;animation:.5s cubic-bezier(.3,1.4,.5,1) ex-node-pop}@keyframes ex-node-pop{0%{scale:1}40%{scale:1.07}to{scale:1}}.ex-rel-node--gate .ex-rel-gate-door{transform-box:fill-box;transform-origin:top;transition:transform .45s cubic-bezier(.3,1.2,.4,1)}.ex-rel-node--gate .ex-rel-gate--open+.ex-rel-gate-door{transform:rotate(-26deg)}.ex-rel-node--gate .ex-rel-gate--blocked{animation:.4s ex-shake}.ex-rel-node--gate .ex-rel-gate--blocked~.ex-rel-gate-door{stroke:var(--danger)}@keyframes ex-shake{0%,to{transform:translate(0)}25%{transform:translate(-2.5px)}60%{transform:translate(2px)}}.ex-rel-meter-fill{transition:width .5s cubic-bezier(.3,.8,.3,1)}.ex-rel-stack-bar:last-of-type{animation:.5s cubic-bezier(.2,.9,.3,1.2) both ex-drop-in}@keyframes ex-drop-in{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.ex-step-title{animation:.4s both ex-fade-up}@keyframes ex-fade-up{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.ex-rel-edge--active,.ex-packet,.ex-packet--trail,.ex-packet--halo,.ex-depart,.ex-rel-node.dst,.ex-rel-node--gate .ex-rel-gate--blocked,.ex-rel-stack-bar:last-of-type,.ex-step-title,.ex-rel-node--core.touched circle.ex-rel-ring{animation:none!important}.ex-rel-node--gate .ex-rel-gate-door,.ex-rel-meter-fill{transition:none!important}}.ex-process{background:var(--bg-subtle);border-radius:var(--ex-radius-md);align-items:center;gap:10px;min-height:32px;margin-top:10px;padding:8px 12px;display:flex}.ex-process-dot{background:var(--text-muted);border-radius:50%;flex:none;width:9px;height:9px;animation:1.1s ease-in-out infinite ex-phase-blink}.ex-process-dot--model{background:var(--evt-model)}.ex-process-dot--tool{background:var(--evt-tool)}.ex-process-dot--lifecycle{background:var(--brand-600)}.ex-process-dot--error{background:var(--evt-error)}.ex-process-dot--idle{background:var(--border-strong);animation:none}@keyframes ex-phase-blink{0%,to{opacity:1}50%{opacity:.35}}.ex-process-text{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:12.5px;overflow:hidden}.ex-process-dots{flex:none;gap:4px;display:flex}.ex-process-dots span{border-radius:var(--ex-radius-xs);background:var(--border-default);width:10px;height:4px;transition:background .3s}.ex-process-dots span.on{background:var(--brand-600)}@media (prefers-reduced-motion:reduce){.ex-process-dot{animation:none!important}}@media (max-width:1200px){.ex-body{grid-template-columns:260px minmax(0,1fr)}.ex-overview{grid-column:1/-1;max-height:none;position:static}}@media (max-width:900px){.ex-body{grid-template-columns:1fr;padding:12px 16px 20px}.ex-sidebar{max-height:none;position:static}.ex-progress{width:100%;min-width:0}}.ex-root{--ex-shadow-1:0 1px 2px #1c2b3a0d, 0 8px 24px #1c2b3a0f;--ex-shadow-2:0 2px 6px #1c2b3a12, 0 16px 40px #1c2b3a17;--ex-hairline:inset 0 1px 0 #ffffffd9}.ex-root ::selection{background:#446b622e}.ex-sidebar,.ex-console,.ex-overview,.ex-stage{box-shadow:var(--ex-shadow-1), var(--ex-hairline)}.ex-stage{box-shadow:var(--ex-shadow-2), var(--ex-hairline)}.ex-header{z-index:6;-webkit-backdrop-filter:blur(12px)saturate(1.15);backdrop-filter:blur(12px)saturate(1.15);background:color-mix(in srgb, var(--ex-panel) 84%, transparent);position:sticky;top:0}.ex-brand h1{letter-spacing:-.015em;font-weight:700}.ex-step-head h2,h2.ex-step-title{letter-spacing:.02em;font-size:23px;font-weight:600;line-height:1.3}.ex-overview-head h2{letter-spacing:.02em;font-size:20px;font-weight:600}.ex-eyebrow{letter-spacing:.14em;text-transform:uppercase;color:var(--brand-600);font-size:11px;font-weight:600}.ex-root :focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}.ex-btn--primary{box-shadow:0 1px 2px #446b6259,inset 0 1px #ffffff24}.ex-btn--primary:hover:not(:disabled){transform:translateY(-1px)}.ex-btn--primary:active:not(:disabled){transform:translateY(0)}.ex-lesson-head{border-radius:var(--ex-radius-md);transition:border-color .14s,background-color .14s,box-shadow .14s}.ex-lesson-head:hover{box-shadow:var(--ex-shadow-1);border-color:var(--ex-line-strong)}.ex-lesson-head.open{box-shadow:inset 2px 0 0 var(--brand-600)}.ex-progress-segments .seg{border-radius:var(--ex-radius-xs);transition:background-color .35s}.ex-rel-caption,.ex-process{background:var(--bg-subtle);border-radius:0 0 var(--ex-radius-lg) var(--ex-radius-lg)}.ex-rel-caption{border-top:1px dashed var(--ex-line)}.ex-challenge{border-top:1px solid var(--ex-line);margin-top:12px;padding-top:12px}.ex-challenge h3{letter-spacing:.06em;color:var(--text-primary);align-items:center;gap:6px;margin:0 0 8px;font-size:12px;display:flex}.ex-challenge-task{color:var(--text-primary);margin:0 0 8px;font-size:13px;font-weight:500}.ex-challenge-checks{gap:5px;margin:0;padding:0;list-style:none;display:grid}.ex-challenge-checks li{color:var(--text-secondary);padding-left:20px;font-size:12px;line-height:1.5;position:relative}.ex-challenge-checks li:before{content:"";border:1.5px solid var(--border-strong);border-radius:3px;width:12px;height:12px;position:absolute;top:3px;left:0}.challenge-spec{border-top:1px dashed var(--line);margin-top:10px;padding-top:10px}.challenge-spec-title{color:var(--ink-soft);align-items:center;gap:5px;margin:0 0 6px;font-size:12px;font-weight:600;display:flex}.challenge-spec-checks{gap:4px;margin:0;padding:0;list-style:none;display:grid}.challenge-spec-checks li{color:var(--slate);padding-left:18px;font-size:12px;line-height:1.5;position:relative}.challenge-spec-checks li:before{content:"";border:1.5px solid var(--line-strong);border-radius:3px;width:11px;height:11px;position:absolute;top:3px;left:0}.learn-split{grid-template-columns:minmax(0,1fr);gap:24px}.learn-split .lesson-col{width:100%;max-width:80ch;margin:0 auto}.lesson-meta{letter-spacing:.14em;text-transform:uppercase;color:var(--brand-600);font-size:11px;font-weight:600}.workspace-body{padding:16px 24px 40px}.workbench{grid-template-columns:250px minmax(0,1fr) minmax(320px,400px);gap:16px;width:100%;max-width:1400px;margin:0 auto;padding:0}.wb-task,.wb-result{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:4px;top:76px;box-shadow:0 1px 2px #1c2b3a0d,0 8px 24px #1c2b3a0f,inset 0 1px #ffffffd9}.wb-task .challenge-card,.wb-result .assessment-panel,.wb-result .run-output,.wb-result .console-label{border-radius:var(--radius);margin:8px}.topbar{z-index:6;-webkit-backdrop-filter:blur(12px)saturate(1.15);backdrop-filter:blur(12px)saturate(1.15);background:color-mix(in srgb, var(--bg-page) 86%, transparent);border-bottom:1px solid var(--border-default);padding:12px 24px 10px;position:sticky;top:0}.topbar h1,.topbar .ws-title{letter-spacing:.01em;font-size:17px;font-weight:600}.tabbar{border-bottom:1px solid var(--border-default);background:0 0;margin:0;padding:0 24px}.tabbar .tab{border:1px solid #0000;border-bottom:none;border-radius:8px 8px 0 0;font-weight:500}.tabbar .tab.active{background:var(--bg-surface);border-color:var(--border-default);color:var(--text-primary);font-weight:600}.ex-promo{background:var(--accent-tint);color:var(--brand-700,var(--brand-600));border-bottom:1px solid var(--border-default);letter-spacing:.02em;flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;padding:7px 24px;font-size:12.5px;font-weight:600;display:flex}.ex-promo-text{align-items:center;gap:6px;display:inline-flex}.ex-promo-sub{color:var(--text-secondary);font-size:11.5px;font-weight:400}