:root{--background: #0b1220;--panel: #111827;--panel-alt: #0f172a;--panel-border: #263244;--text: #e5e7eb;--muted: #94a3b8;--sync: #38bdf8;--nexttick: #4ade80;--microtask: #c084fc;--timer: #fb923c;--other: #9ca3af;--accent: #22c55e;--danger: #f87171;--radius: 8px;--font-mono: "Consolas", "Menlo", "Monaco", "Courier New", monospace;--font-sans: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{min-height:100%}body{margin:0;background:var(--background);color:var(--text);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,p{margin:0}button{font-family:inherit;cursor:pointer}.panel{background:var(--panel);border:1px solid var(--panel-border);border-radius:var(--radius)}.panel-title{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:10px 14px;border-bottom:1px solid var(--panel-border);display:flex;align-items:center;justify-content:space-between}.scroll{overflow:auto}.pill{display:inline-flex;align-items:center;gap:6px;padding:2px 8px;border-radius:999px;font-size:11px}.app{display:flex;flex-direction:column;height:100vh;gap:10px;padding:10px}.main-content{display:flex;flex-direction:column;flex:1;min-height:0;gap:10px}.top-row{display:flex;min-height:0;flex-shrink:0;gap:10px}.bottom-row{display:flex;flex:1;min-height:0;max-height:300px;gap:10px}.area-code{display:flex;flex-direction:column;min-height:0;flex-shrink:0}.area-runtime{display:flex;flex-direction:column;gap:10px;min-height:0;flex:1;min-width:0}.runtime-queues-wrap{display:flex;min-height:0;min-width:0;flex-shrink:0}.runtime-phases-wrap{display:flex;flex:1;min-height:0;min-width:0}.area-about,.area-output{min-height:0;display:flex;flex-shrink:0}.area-explanation{min-height:0;display:flex;flex:1;min-width:0}@media (max-width: 1024px){.app{height:auto!important;min-height:100vh;padding:10px;gap:10px;overflow-x:hidden}.main-content{display:flex;flex-direction:column;height:auto!important;flex:none!important;gap:0}.top-row,.bottom-row,.area-runtime{display:contents!important}.resizer-desktop{display:none!important}.resizer-mobile{display:flex!important;height:24px!important;margin:-4px 0!important;cursor:row-resize;touch-action:none;align-items:center;justify-content:center;position:relative;z-index:10;-webkit-user-select:none;user-select:none}.area-code{order:1;width:100%!important;height:auto!important;flex:none!important;display:flex;flex-direction:column}.area-code .code-editor-wrap{height:var(--mobile-code-h, 260px)!important;min-height:140px;width:100%!important;flex:none!important;display:flex;flex-direction:column}.resizer-mobile-code{order:2}.runtime-queues-wrap{order:3;width:100%!important;height:var(--mobile-queues-h, 280px)!important;min-height:140px;flex:none!important}.resizer-mobile-queues{order:4}.area-output{order:5;width:100%!important;height:var(--mobile-output-h, 200px)!important;min-height:120px;flex:none!important}.resizer-mobile-output{order:6}.runtime-phases-wrap{order:7;width:100%!important;height:var(--mobile-phases-h, 160px)!important;min-height:100px;flex:none!important}.resizer-mobile-phases{order:8}.area-explanation{order:9;width:100%!important;height:var(--mobile-explanation-h, 240px)!important;min-height:140px;flex:none!important}.resizer-mobile-explanation{order:10}.area-about{order:11;width:100%!important;height:auto!important;flex:none!important;margin-top:4px}}@media (max-width: 640px){.app{padding:6px;gap:6px}.resizer-mobile{height:16px}}.resizer{flex-shrink:0;background:transparent;position:relative;z-index:2;touch-action:none;display:flex;align-items:center;justify-content:center}.resizer:after{content:"";position:absolute;background:var(--panel-border);border-radius:999px;transition:background .15s ease,width .15s ease,height .15s ease,box-shadow .15s ease}.resizer.horizontal{width:12px;margin:0 -6px;cursor:col-resize}.resizer.horizontal:after{top:50%;left:50%;width:4px;height:36px;transform:translate(-50%,-50%)}.resizer.vertical{height:16px;margin:-6px 0;cursor:row-resize;width:100%}.resizer.vertical:after{top:50%;left:50%;height:4px;width:48px;transform:translate(-50%,-50%)}.resizer:hover:after,.resizer:active:after{background:var(--sync)}.resizer.vertical:hover:after,.resizer.vertical:active:after{background:var(--sync);width:72px;box-shadow:0 0 8px #38bdf873}.resizer.horizontal:hover:after,.resizer.horizontal:active:after{background:var(--sync);height:48px;box-shadow:0 0 8px #38bdf873}.resizer-mobile{display:none}.header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 14px;flex-wrap:wrap}.header-left{display:flex;align-items:center;gap:10px;font-weight:700;font-size:15px;white-space:nowrap}.header-logo{width:26px;height:26px;border-radius:6px;background:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:900;color:#06240f}.header-center{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.header-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}select.example-select{background:var(--panel-alt);color:var(--text);border:1px solid var(--panel-border);border-radius:6px;padding:6px 10px;font-size:13px}.btn{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:6px;border:1px solid var(--panel-border);background:var(--panel-alt);color:var(--text);font-size:13px}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#06240f;font-weight:700}.btn-secondary{background:#2563eb;border-color:#2563eb;color:#eff6ff}.speed-control{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}.speed-control input[type=range]{accent-color:var(--sync)}.autorun-toggle{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--muted)}.code-editor-wrap{flex:1;display:flex;flex-direction:column;min-height:0;height:100%;width:100%;position:relative}.code-editor-body{flex:1;min-height:0;height:100%;width:100%;position:relative;display:flex;flex-direction:column}.current-line-highlight{background:#38bdf838!important;border-left:3px solid var(--sync)}.queued-line-highlight{background:#94a3b81f!important;border-left:3px solid var(--muted)}.runtime-panel{flex:1;min-height:0;min-width:0;display:flex;flex-direction:column}.queues-row{display:grid;grid-template-columns:repeat(4,minmax(140px,1fr));gap:10px;padding:10px;overflow:auto;flex:1;min-width:0}.queue-col{display:flex;flex-direction:column;gap:8px;min-height:120px}.queue-col-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding-bottom:4px;border-bottom:2px solid transparent}.queue-col-title.sync{color:var(--sync);border-color:var(--sync)}.queue-col-title.nexttick{color:var(--nexttick);border-color:var(--nexttick)}.queue-col-title.microtask{color:var(--microtask);border-color:var(--microtask)}.queue-col-title.timer{color:var(--timer);border-color:var(--timer)}.queue-empty{font-size:12px;color:var(--muted);font-style:italic;padding:8px 2px}.item-card{border-radius:6px;padding:8px 10px;font-size:12px;animation:pop-in .2s ease-out;border:1px solid var(--panel-border);background:var(--panel-alt)}.item-card .item-name{font-weight:700;margin-bottom:2px}.item-card .item-line{color:var(--muted);font-size:11px}.item-card.sync{border-color:var(--sync);box-shadow:0 0 0 1px #38bdf840 inset}.item-card.nexttick{border-color:var(--nexttick);box-shadow:0 0 0 1px #4ade8040 inset}.item-card.microtask{border-color:var(--microtask);box-shadow:0 0 0 1px #c084fc40 inset}.item-card.timer{border-color:var(--timer);box-shadow:0 0 0 1px #fb923c40 inset}@keyframes pop-in{0%{opacity:0;transform:translateY(-6px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}.phases-panel{display:flex;flex-direction:column;flex:1;gap:12px;padding:14px;min-width:0}.phases-row{display:flex;align-items:stretch;gap:0;overflow-x:auto;overflow-y:hidden;padding-bottom:4px}.phase-box{flex:1 1 0;min-width:120px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:76px;border:1px solid var(--panel-border);border-radius:8px;padding:10px;text-align:center;background:var(--panel-alt);position:relative;color:var(--muted);transition:border-color .15s,background .15s,color .15s}.phase-box .phase-num{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:999px;background:var(--panel-border);font-size:10px;font-weight:700;color:var(--muted)}.phase-box .phase-title{font-size:11.5px;line-height:1.35;font-weight:500}.phase-box.active{border-color:var(--sync);background:#38bdf81f;color:var(--text);box-shadow:0 0 0 1px #38bdf859}.phase-box.active .phase-num{background:var(--sync);color:#06202e}.phase-box.active .phase-title{font-weight:700}.phase-box.done{border-color:var(--accent);color:var(--text)}.phase-box.done .phase-num{background:var(--accent);color:#06240f}.phase-arrow{flex:0 0 auto;align-self:center;color:var(--muted);font-size:14px;padding:0 6px}.current-phase-caption{text-align:center;font-size:11px;color:var(--sync);font-weight:700;letter-spacing:.04em;text-transform:uppercase}.output-panel{flex:1;min-height:0;display:flex;flex-direction:column}.output-body{flex:1;overflow:auto;padding:8px 0;font-family:var(--font-mono);font-size:13px}.output-line{display:flex;gap:10px;padding:2px 14px}.output-line .line-no{color:var(--muted);min-width:18px;text-align:right}.output-line .line-text{color:#a7f3d0}.output-empty{color:var(--muted);font-style:italic;padding:8px 14px}.clear-btn{background:transparent;border:1px solid var(--panel-border);color:var(--muted);border-radius:6px;font-size:11px;padding:2px 8px}.explanation-panel{flex:1;min-height:0;display:flex;flex-direction:column}.explanation-body{flex:1;overflow:auto;padding:14px;font-size:13px;line-height:1.6}.step-badge{color:var(--sync);font-weight:700;font-size:13px;margin-bottom:10px}.explanation-title{font-size:15px;font-weight:700;margin-bottom:10px;color:var(--text)}.explanation-section{margin-bottom:12px}.explanation-section h4{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin-bottom:4px}.explanation-section p{color:var(--text)}.explanation-history{margin-top:18px;padding-top:14px;border-top:1px solid var(--panel-border)}.explanation-history>h4{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin-bottom:10px}.explanation-history-list{display:flex;flex-direction:column;gap:8px}.history-step{border:1px solid var(--panel-border);border-radius:6px;padding:8px 10px;background:var(--panel-alt)}.history-step-num{font-size:11px;font-weight:700;color:var(--sync);margin-bottom:2px}.history-step-title{font-size:12px;font-weight:700;color:var(--text);margin-bottom:2px}.history-step-text{font-size:12px;color:var(--muted)}.call-stack-list{display:flex;flex-direction:column;gap:8px}.about-panel{flex:1;min-height:0;display:flex;flex-direction:column}.about-body{padding:12px 14px;font-size:13px;color:var(--muted);line-height:1.6;overflow:auto}.about-steps{display:flex;gap:8px;flex-wrap:wrap;padding:0 14px 14px}.about-step-chip{border:1px solid var(--panel-border);border-radius:6px;padding:8px;font-size:11px;min-width:70px;text-align:center;background:var(--panel-alt)}.about-step-chip .chip-num{font-weight:700;color:var(--sync)}.legend-panel{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding:10px 14px}.legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--muted)}.legend-swatch{width:12px;height:12px;border-radius:3px}.legend-note{color:var(--muted);font-size:11px;font-style:italic}.footer-tip{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;font-size:12px;color:var(--muted)}@media (max-width: 900px){.header{gap:12px;padding:10px 12px}.queues-row{grid-template-columns:repeat(2,1fr);gap:10px;padding:10px}.queue-col{min-height:100px}}@media (max-width: 768px){.header{flex-direction:column;align-items:stretch;gap:10px;padding:10px}.header-left{justify-content:flex-start;font-size:14px}.header-center{display:flex;flex-wrap:wrap;align-items:center;gap:8px;width:100%}select.example-select{flex:1 1 100%;width:100%;padding:8px 10px;font-size:14px}.header-center .btn{flex:1 1 calc(33.333% - 8px);justify-content:center;padding:8px 10px;font-size:13px;min-height:38px}.header-right{display:flex;justify-content:space-between;align-items:center;width:100%;gap:12px;padding-top:8px;border-top:1px solid var(--panel-border)}.speed-control{flex:1;min-width:0}.speed-control input[type=range]{flex:1;min-width:60px}.autorun-toggle{flex-shrink:0}.phases-panel{padding:10px 12px;gap:8px}.phases-row{-webkit-overflow-scrolling:touch;scrollbar-width:thin;padding-bottom:6px}.phases-row::-webkit-scrollbar{height:4px}.phases-row::-webkit-scrollbar-thumb{background:var(--panel-border);border-radius:4px}.phase-box{min-width:100px;min-height:64px;padding:8px 6px;gap:4px}.phase-box .phase-title{font-size:10.5px}.phase-arrow{padding:0 3px;font-size:11px}.about-body{padding:10px 12px;font-size:12.5px}.about-steps{padding:0 12px 10px;gap:6px}.about-step-chip{padding:6px 8px;min-width:55px;font-size:10.5px}.explanation-panel{display:flex;flex-direction:column;height:100%;min-height:0}.explanation-body{padding:10px 12px;font-size:12.5px;overflow:auto;flex:1;min-height:0}.explanation-title{font-size:14px}.output-panel{display:flex;flex-direction:column;height:100%;min-height:0}.output-body{overflow:auto;flex:1;min-height:0}.output-line{padding:2px 10px;font-size:12px}.output-empty{padding:8px 10px;font-size:12px}.legend-panel{gap:8px 12px;padding:10px 12px}.legend-item{font-size:11.5px}.legend-note{width:100%;margin-top:2px;font-size:10.5px}.footer-tip{flex-direction:column;gap:4px;text-align:center;padding:8px 12px;font-size:11px}}@media (max-width: 480px){.header-left{font-size:13.5px}.header-center .btn{font-size:12px;padding:6px;gap:4px}.queues-row{grid-template-columns:1fr 1fr;gap:6px;padding:6px}.item-card{padding:6px 8px;font-size:11px}.item-card .item-line{font-size:10px}.phase-box{min-width:88px;min-height:58px;padding:6px 4px}.phase-box .phase-title{font-size:9.5px}}@media (max-width: 360px){.queues-row{grid-template-columns:1fr}}