:root{color-scheme:dark;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;font-size:15px;line-height:1.6;--bg: #0f1115;--bg-elev: #13151c;--bg-elev-2: #1a1d26;--border: #262a35;--border-soft: #1f222c;--text: #e8eaed;--text-dim: #b4b8cc;--text-faint: #8b90a8;--text-strong: #f5f6f8;--vue: #42b883;--vue-dim: #2d8f65;--vue-bg: rgba(66, 184, 131, .08);--vue-bg-strong: rgba(66, 184, 131, .14);--react: #61dafb;--react-dim: #3aa5cc;--react-bg: rgba(97, 218, 251, .08);--react-bg-strong: rgba(97, 218, 251, .14);--accent: #7aa2f7;--accent-warn: #f7bb7a;--accent-danger: #f77a7a;--accent-good: #7af7aa;--surface-1: #181b23;--surface-2: #1d2029;--surface-hover: #1c1f2a;--surface-active: #273449;--surface-active-hover: #324463;--surface-active-border: #3a4a68}:root[data-theme=light]{color-scheme:light;--bg: #ffffff;--bg-elev: #f7f8fa;--bg-elev-2: #eef0f4;--border: #e3e6ec;--border-soft: #eceef3;--text: #1f2328;--text-dim: #51606e;--text-faint: #7a8593;--text-strong: #0a0d11;--vue: #1f8a5f;--vue-dim: #106b46;--vue-bg: rgba(31, 138, 95, .07);--vue-bg-strong: rgba(31, 138, 95, .12);--react: #087ea4;--react-dim: #055f7e;--react-bg: rgba(8, 126, 164, .07);--react-bg-strong: rgba(8, 126, 164, .12);--accent: #4f72d9;--accent-warn: #c56e10;--accent-danger: #c9302c;--accent-good: #2e9c57;--surface-1: #f5f6f9;--surface-2: #f0f2f6;--surface-hover: #eceef3;--surface-active: #dce5f4;--surface-active-hover: #c9d5ec;--surface-active-border: #b2c2dd}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}code,pre{font-family:JetBrains Mono,ui-monospace,Menlo,Monaco,Consolas,monospace;font-size:13px}pre{background:var(--bg-elev);border:1px solid var(--border);border-radius:8px;padding:14px 16px;overflow-x:auto;line-height:1.55}:not(pre)>code,code.inline{background:var(--surface-2);border:1px solid var(--border);border-radius:4px;padding:1px 5px;font-size:.88em}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{color:var(--text-strong)}h2{margin:1.8em 0 .6em;border-bottom:1px solid var(--border);padding-bottom:.3em;font-size:22px}h3{margin:1.6em 0 .5em;font-size:17px}ul,ol{padding-left:22px}li{margin:4px 0}.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{border-right:1px solid var(--border);padding:20px 16px;background:var(--bg-elev);overflow-y:auto;max-height:100vh;position:sticky;top:0}.sidebar h1{font-size:14px;margin:0 0 18px;letter-spacing:.05em;text-transform:uppercase;color:var(--text-dim)}.sidebar-brand{display:flex;align-items:center;gap:8px;margin:0 0 22px;padding:4px 2px;color:var(--text-strong);font-weight:700;font-size:17px;text-decoration:none}.sidebar-brand:hover{text-decoration:none;color:var(--text-strong)}.logo-mark{display:block;overflow:visible}.sidebar-wordmark{letter-spacing:-.01em;font-family:JetBrains Mono,ui-monospace,Menlo,monospace;font-size:15px}.wm-vue{color:var(--vue)}.wm-two{color:var(--text-faint)}.wm-react{color:var(--react)}.sidebar ol{list-style:none;padding:0;margin:0;counter-reset:lesson}.sidebar li{margin:2px 0;counter-increment:lesson}.sidebar ol a{display:block;padding:7px 10px;border-radius:6px;color:var(--text-dim);font-size:13.5px}.sidebar ol a:before{content:counter(lesson,decimal-leading-zero) ". ";color:var(--text-faint);margin-right:4px;font-variant-numeric:tabular-nums}.sidebar ol a:hover{background:var(--surface-hover);color:var(--text-strong);text-decoration:none}.sidebar ol a.active{background:var(--surface-active);color:var(--text-strong)}.main{padding:28px 40px 120px;max-width:1040px;overflow-x:hidden}.lesson-header{margin-bottom:12px}.lesson-header h1{margin:0 0 4px;font-size:28px}.lesson-header .sub{color:var(--text-faint);font-size:14px}.sub{color:var(--text-faint)}.tabs{display:flex;gap:2px;border-bottom:1px solid var(--border);margin:18px 0 24px}.tabs button{background:none;border:none;color:var(--text-faint);padding:9px 16px;font-size:14px;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;font-weight:500}.tabs button.active{color:var(--text-strong);border-bottom-color:var(--accent)}.tabs button:hover{color:var(--text-strong)}.tabs .tab-index{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;margin-right:6px;border-radius:50%;background:var(--bg-elev-2);color:var(--text-faint);font-size:11px;font-weight:600;font-variant-numeric:tabular-nums}.tabs button.active .tab-index{background:var(--accent);color:var(--bg)}.demo-box{border:1px solid var(--border);border-radius:10px;padding:22px;background:var(--bg-elev)}.demo-box button,.demo-box input,.demo-box select,.demo-box textarea{font:inherit;color:inherit}.demo-box button{background:var(--surface-active);color:var(--text-strong);border:1px solid var(--surface-active-border);padding:6px 14px;border-radius:6px;cursor:pointer}.demo-box button:disabled{opacity:.45;cursor:not-allowed}.demo-box button:hover:not(:disabled){background:var(--surface-active-hover)}.demo-box input,.demo-box select,.demo-box textarea{background:var(--bg);border:1px solid var(--surface-active-border);border-radius:6px;padding:6px 10px}.prose{font-size:15px}.prose>:first-child{margin-top:0}.prose p{margin:.9em 0}.prose strong{color:var(--text-strong)}.compare{margin:16px 0 22px;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--bg-elev)}.compare-header{display:grid;grid-template-columns:1fr 1fr;background:var(--bg-elev-2)}.compare-label{padding:9px 16px;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.compare-label.vue{color:var(--vue);border-right:1px solid var(--border);background:var(--vue-bg)}.compare-label.react{color:var(--react);background:var(--react-bg)}.compare-row{border-top:1px solid var(--border-soft)}.compare-row:first-child{border-top:none}.compare-desc{padding:10px 16px 4px;color:var(--text-dim);font-size:13px;font-weight:500;background:var(--surface-1)}.compare-pair{display:grid;grid-template-columns:1fr 1fr}.compare-cell{padding:12px 16px;font-family:JetBrains Mono,ui-monospace,Menlo,monospace;font-size:13px;overflow-x:auto;line-height:1.55;white-space:pre-wrap;word-break:break-word}.compare-cell>code{background:none;border:none;padding:0;font-size:inherit;white-space:pre-wrap}.compare-cell.vue{border-right:1px solid var(--border);background:var(--vue-bg)}.compare-cell.react{background:var(--react-bg)}.compare-note{padding:8px 16px 10px;color:var(--text-faint);font-size:12.5px;font-style:italic;border-top:1px dashed var(--border-soft);background:var(--surface-1)}.compare-dense .compare-cell{padding:8px 14px;font-size:12.5px}.sbs-wrapper{margin:16px 0 22px}.sbs-caption{color:var(--text-dim);font-size:13px;margin-bottom:6px}.sbs{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media (max-width: 900px){.sbs,.compare-header,.compare-pair{grid-template-columns:1fr}.compare-label.vue,.compare-cell.vue{border-right:none;border-bottom:1px solid var(--border)}}.sbs-col{border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--bg-elev)}.sbs-title{padding:7px 14px;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;border-bottom:1px solid var(--border)}.sbs-col.vue .sbs-title{color:var(--vue);background:var(--vue-bg)}.sbs-col.react .sbs-title{color:var(--react);background:var(--react-bg)}.sbs pre{margin:0;border:none;border-radius:0;background:var(--bg-elev)}.code-block{margin:14px 0}.callout{display:grid;grid-template-columns:24px 1fr;gap:10px;align-items:start;margin:16px 0;padding:12px 16px;border-radius:8px;border-left:3px solid}.callout-icon{font-weight:700;font-size:14px;text-align:center;width:22px;height:22px;line-height:22px;border-radius:999px;color:var(--text-strong)}.callout-title{font-weight:600;margin-bottom:4px;color:var(--text-strong)}.callout-body p:first-child{margin-top:0}.callout-body p:last-child{margin-bottom:0}.callout-body>*+*{margin-top:6px}.callout-info{border-color:var(--accent);background:#7aa2f714}.callout-info .callout-icon{background:#7aa2f740}.callout-warn{border-color:var(--accent-warn);background:#f7bb7a14}.callout-warn .callout-icon{background:#f7bb7a40}.callout-gotcha{border-color:var(--accent-danger);background:#f77a7a14}.callout-gotcha .callout-icon{background:#f77a7a40}.callout-success{border-color:var(--accent-good);background:#7af7aa14}.callout-success .callout-icon{background:#7af7aa40}.callout-tip{border-color:#c99af7;background:#c99af714}.callout-tip .callout-icon{background:#c99af740;font-size:13px}.practice{margin:24px 0 8px;padding:14px 18px;border:1px solid var(--border);border-left:3px solid var(--accent-good);border-radius:8px;background:#7af7aa0a}.practice-label{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-good);margin-bottom:4px}.landing{min-height:100vh;display:grid;place-items:center;padding:40px 24px;background:radial-gradient(1000px 600px at 80% -10%,var(--react-bg-strong),transparent 60%),radial-gradient(900px 500px at -10% 110%,var(--vue-bg-strong),transparent 55%),var(--bg)}.landing-inner{max-width:760px;width:100%;text-align:center}.landing-brand{display:inline-flex;align-items:center;gap:12px;margin-bottom:40px;font-size:20px;font-weight:700;color:var(--text-strong)}.landing-wordmark{letter-spacing:-.015em;font-family:JetBrains Mono,ui-monospace,Menlo,monospace;font-size:22px}.landing-headline{font-size:52px;line-height:1.1;letter-spacing:-.025em;margin:0 0 20px;color:var(--text-strong);font-weight:700}.landing-sub{font-size:17px;line-height:1.65;color:var(--text-dim);margin:0 auto 36px;max-width:640px}.landing-sub code{background:var(--bg-elev);border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-size:.88em;color:var(--text-strong)}.landing-cta{display:inline-flex;align-items:center;gap:10px;background:var(--accent);color:#0b0d12;padding:14px 24px;border-radius:10px;font-size:15px;font-weight:600;text-decoration:none;transition:transform .12s ease,box-shadow .12s ease;box-shadow:0 4px 20px #7aa2f740}.landing-cta:hover{transform:translateY(-1px);box-shadow:0 6px 24px #7aa2f766;text-decoration:none}.landing-cta-arrow{transition:transform .12s ease;font-weight:400}.landing-cta:hover .landing-cta-arrow{transform:translate(3px)}.landing-meta{display:flex;justify-content:center;align-items:center;gap:10px;margin-top:28px;color:var(--text-faint);font-size:13px}.landing-meta-dot{opacity:.5}@media (max-width: 640px){.landing-headline{font-size:36px}.landing-sub{font-size:15px}}.demo-view{display:grid;gap:18px}.demo-stage{border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--bg-elev)}.demo-stage-label{padding:8px 14px;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);border-bottom:1px solid var(--border);background:#7aa2f714}.demo-stage-box{padding:22px}.demo-stage-box button,.demo-stage-box input,.demo-stage-box select,.demo-stage-box textarea{font:inherit;color:inherit}.demo-stage-box button{background:var(--surface-active);color:var(--text-strong);border:1px solid var(--surface-active-border);padding:6px 14px;border-radius:6px;cursor:pointer}.demo-stage-box button:disabled{opacity:.45;cursor:not-allowed}.demo-stage-box button:hover:not(:disabled){background:var(--surface-active-hover)}.demo-stage-box input,.demo-stage-box select,.demo-stage-box textarea{background:var(--bg);border:1px solid var(--surface-active-border);border-radius:6px;padding:6px 10px}.demo-sources .sbs-col pre{max-height:520px;overflow:auto}.exercise-view{display:grid;gap:18px}.exercise-instructions{border:1px solid var(--border);border-left:3px solid var(--accent-good);border-radius:8px;background:#7af7aa0a;padding:14px 18px}.exercise-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.exercise-label>span{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-good)}.solution-toggle{background:transparent;color:var(--text-dim);border:1px solid var(--border);padding:4px 10px;border-radius:6px;font-size:12px;cursor:pointer}.solution-toggle:hover{color:var(--text-strong);border-color:var(--accent)}.exercise-instructions-body{color:var(--text)}.exercise-instructions-body p:first-child{margin-top:0}.exercise-instructions-body p:last-child{margin-bottom:0}.exercise-instructions-body ol,.exercise-instructions-body ul{margin:0;padding-left:22px}.exercise-view .sp-wrapper,.exercise-view .sp-layout{border-radius:10px!important;border:1px solid var(--border)!important}.theme-toggle{position:fixed;top:14px;right:16px;z-index:50;display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;border-radius:9px;border:1px solid var(--border);background:var(--bg-elev);color:var(--text-dim);cursor:pointer;transition:color .12s ease,background .12s ease,border-color .12s ease}.theme-toggle:hover{color:var(--text-strong);background:var(--bg-elev-2);border-color:var(--text-faint)}.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sidebar-burger{display:none;position:fixed;top:14px;left:16px;z-index:70;align-items:center;justify-content:center;width:36px;height:36px;padding:0;border-radius:9px;border:1px solid var(--border);background:var(--bg-elev);color:var(--text-dim);cursor:pointer;transition:color .12s ease,background .12s ease,border-color .12s ease}.sidebar-burger:hover{color:var(--text-strong);background:var(--bg-elev-2);border-color:var(--text-faint)}.sidebar-burger:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sidebar-backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;z-index:55;opacity:0;pointer-events:none;transition:opacity .2s ease}@media (max-width: 1024px){.app{grid-template-columns:1fr}.sidebar-burger{display:inline-flex}.sidebar{position:fixed;top:0;left:0;bottom:0;width:280px;max-height:100vh;z-index:60;transform:translate(-100%);transition:transform .24s ease;box-shadow:2px 0 24px #00000059}.app.sidebar-visible .sidebar{transform:translate(0)}.sidebar-backdrop{display:block}.app.sidebar-visible .sidebar-backdrop{opacity:1;pointer-events:auto}.sidebar-burger{transition:left .24s ease,color .12s ease,background .12s ease,border-color .12s ease}.app.sidebar-visible .sidebar-burger{left:230px}.main{padding:68px 24px 120px}}@media (max-width: 640px){.main{padding:68px 16px 120px}}
