@font-face{font-family:JetBrains Mono;font-style:normal;font-display:swap;font-weight:400;src:url(./jetbrains-mono-latin-400-normal-V6pRDFza.woff2)format("woff2"),url(./jetbrains-mono-latin-400-normal-6-qcROiO.woff)format("woff")}@font-face{font-family:JetBrains Mono;font-style:normal;font-display:swap;font-weight:600;src:url(./jetbrains-mono-latin-600-normal-C8RAYTDA.woff2)format("woff2"),url(./jetbrains-mono-latin-600-normal-BfsvjouI.woff)format("woff")}:root,:root[data-theme=dark]{--lightningcss-light: 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;color-scheme:light;--bg:#f5f6fb;--bg-elevated:#fff;--surface:#fff;--surface-2:#eef0f8;--border:#d9dcec;--text:#171a2c;--text-muted:#4f5575;--text-faint:#626884;--accent:#4d5ee8;--accent-strong:#3a4bd6;--accent-contrast:#fff;--gold:#c98a00;--success:#12945c;--success-bg:#12945c1f;--danger:#d6334a;--danger-bg:#d6334a1a;--warn:#b86e00;--warn-bg:#b86e001a;--code-bg:#fbfbfe;--code-gutter:#9aa0bd;--code-line:#4d5ee80f;--code-error-line:#d6334a24;--tok-keyword:#8e3ec6;--tok-string:#2f8a18;--tok-number:#c2541f;--tok-comment:#8a90ad;--tok-builtin:#2b62d9;--tok-operator:#0f7fa3;--tok-atom:#a66a00;--shadow:0 8px 24px #14183c1f}:root{--font-ui:-apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-code:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;--radius:14px;--radius-sm:10px;--tap:44px;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);--safe-left:env(safe-area-inset-left,0px);--safe-right:env(safe-area-inset-right,0px);--nav-height:58px;--ease:cubic-bezier(.2, .8, .2, 1)}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%;background:var(--bg)}body{background:var(--bg);min-height:100dvh;color:var(--text);font-family:var(--font-ui);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;overscroll-behavior-y:none;margin:0;font-size:16px;line-height:1.5}button,input,select,textarea{font:inherit;color:inherit}input,select,textarea{font-size:16px}code,kbd,pre{font-family:var(--font-code)}a{color:var(--accent)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.app{min-height:100dvh;padding-top:var(--safe-top);padding-bottom:calc(var(--nav-height) + var(--safe-bottom));padding-left:var(--safe-left);padding-right:var(--safe-right)}.screen{max-width:760px;animation:screen-in .22s var(--ease);margin:0 auto;padding:12px 16px 24px}@keyframes screen-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.screen-header{justify-content:space-between;align-items:center;gap:12px;min-height:52px;margin-bottom:8px;display:flex}.screen-header h1{letter-spacing:-.01em;margin:0;font-size:1.6rem;line-height:1.2}.muted{color:var(--text-muted)}.faint{color:var(--text-faint);font-size:.875rem}.stack{flex-direction:column;gap:12px;display:flex}.row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.spacer{flex:1}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.card h2,.card h3{margin:0 0 8px;font-size:1.05rem}.section-title{text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);margin:20px 4px 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a{max-width:140px;min-height:var(--tap);color:var(--text-faint);border-radius:12px;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:2px;font-size:.72rem;font-weight:600;text-decoration:none;display:flex}.bottom-nav a[aria-current=page]{color:var(--accent)}.bottom-nav svg{width:26px;height:26px}.keyboard-open .bottom-nav{display:none}.keyboard-open .app{padding-bottom:64px}.banner{left:calc(12px + var(--safe-left));right:calc(12px + var(--safe-right));bottom:calc(var(--nav-height) + var(--safe-bottom) + 10px);z-index:30;border-radius:var(--radius);background:var(--surface-2);border:1px solid var(--border);max-width:640px;box-shadow:var(--shadow);animation:banner-in .26s var(--ease);align-items:center;gap:12px;margin:0 auto;padding:12px 12px 12px 16px;display:flex;position:fixed}@keyframes banner-in{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}.notice{border-radius:var(--radius-sm);background:var(--warn-bg);color:var(--text);border:1px 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12px;font-size:14px;line-height:1.55;overflow:auto}.console-empty{color:var(--text-faint);font-family:var(--font-ui)}.status-dot{background:var(--text-faint);border-radius:50%;width:8px;height:8px}.status-dot.ok{background:var(--success)}.status-dot.err{background:var(--danger)}.status-dot.run{background:var(--gold);animation:.9s infinite alternate pulse}@keyframes pulse{to{opacity:.3}}.error-card{border-radius:var(--radius);background:var(--danger-bg);border:1px solid color-mix(in srgb, var(--danger) 45%, transparent);animation:screen-in .2s var(--ease);margin-top:12px;padding:14px 16px}.error-card h3{color:var(--danger);align-items:center;gap:8px;margin:0 0 6px;font-size:1.02rem;display:flex}.error-card p{margin:6px 0}.error-card .tip{color:var(--text-muted)}.error-card .original{font-family:var(--font-code);color:var(--text-faint);word-break:break-word;margin-top:8px;font-size:.8rem}.chip{background:var(--surface-2);border:1px solid var(--border);min-height:26px;color:var(--text-muted);border-radius:13px;align-items:center;padding:0 10px;font-size:.8rem;font-weight:600;display:inline-flex}.inline-code,.md code{background:var(--surface-2);border-radius:6px;padding:1px 6px;font-size:.9em}.kbd-toolbar{z-index:40;padding:6px calc(8px + var(--safe-right)) 6px calc(8px + var(--safe-left));overscroll-behavior-x:contain;scrollbar-width:none;background:color-mix(in srgb, var(--bg-elevated) 96%, transparent);border-top:1px solid var(--border);-webkit-backdrop-filter:blur(12px);gap:6px;display:flex;position:fixed;left:0;right:0;overflow-x:auto}.kbd-toolbar::-webkit-scrollbar{display:none}.kbd-toolbar button{border:1px solid var(--border);background:var(--surface);min-width:44px;height:44px;color:var(--text);font-family:var(--font-code);touch-action:manipulation;-webkit-user-select:none;user-select:none;border-radius:10px;flex:none;padding:0 10px;font-size:18px}.kbd-toolbar button:active{background:var(--surface-2)}.kbd-toolbar .kbd-word{color:var(--tok-keyword);font-size:15px}.kbd-toolbar .kbd-nav{color:var(--text-muted);font-family:var(--font-ui)}.kbd-toolbar .kbd-run{background:var(--accent);color:var(--accent-contrast);font-family:var(--font-ui);border-color:#0000}.kbd-toolbar .kbd-sep{background:var(--border);flex:none;width:1px;margin:6px 2px}.sheet-backdrop{z-index:50;animation:fade-in .18s var(--ease);background:#00000073;position:fixed;inset:0}@keyframes fade-in{0%{opacity:0}}.sheet{z-index:51;max-width:640px;max-height:85dvh;padding:8px 16px calc(16px + var(--safe-bottom));background:var(--bg-elevated);box-shadow:var(--shadow);animation:sheet-in .24s var(--ease);border-radius:20px 20px 0 0;margin:0 auto;position:fixed;bottom:0;left:0;right:0;overflow:auto}@keyframes sheet-in{0%{transform:translateY(100%)}}.sheet-grip{background:var(--border);border-radius:3px;width:40px;height:5px;margin:4px auto 12px}.sheet h2{margin:0 0 12px;font-size:1.2rem}.list{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.list li{border-bottom:1px solid var(--border);align-items:center;gap:8px;min-height:52px;display:flex}.list li:last-child{border-bottom:0}.list .list-main{min-width:0;min-height:var(--tap);text-align:left;cursor:pointer;background:0 0;border:0;flex-direction:column;flex:1;justify-content:center;padding:6px 4px;display:flex}.list .list-main strong{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.text-input,.text-area{width:100%;min-height:var(--tap);border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);padding:10px 12px}.text-area{min-height:120px;font-family:var(--font-code);resize:vertical;font-size:14px}.check-list{margin:0;padding:0;list-style:none}.check-list li{border-bottom:1px solid var(--border);grid-template-columns:28px 1fr;gap:4px 8px;padding:10px 0;display:grid}.check-list .icon{font-size:1.1rem;line-height:1.4}.check-list .detail{color:var(--text-muted);word-break:break-word;grid-column:2;font-size:.88rem}.loader{place-items:center;min-height:100dvh;display:grid}.loader img{width:96px;height:96px;animation:.9s infinite alternate pulse}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important}}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.focus-mode{padding-bottom:calc(24px + var(--safe-bottom))}.md p{margin:0 0 10px}.md p:last-child{margin-bottom:0}.md ul{margin:0 0 10px;padding-left:1.2em}.md li{margin:2px 0}.status-bar{justify-content:space-between;align-items:center;gap:8px;min-height:48px;margin-bottom:12px;display:flex}.stat{color:var(--text-muted);font-variant-numeric:tabular-nums;align-items:center;gap:6px;font-size:.95rem;font-weight:700;display:inline-flex}.stat-hot{color:var(--warn)}.ring{width:26px;height:26px;transform:rotate(-90deg)}.ring circle{fill:none;stroke-width:5px}.ring-bg{stroke:var(--surface-2)}.ring-fg{stroke:var(--gold);stroke-linecap:round;transition:stroke-dasharray .4s var(--ease)}.hero h1{margin:0 0 8px;font-size:1.4rem}.hero p{margin:0}.continue-card{color:var(--text);border-color:color-mix(in srgb, var(--accent) 45%, var(--border));justify-content:space-between;align-items:center;gap:12px;margin:12px 0;text-decoration:none;display:flex}.continue-card strong{margin:2px 0;font-size:1.1rem;display:block}.training-hint{color:var(--text);align-items:center;gap:12px;margin:12px 0;font-size:.95rem;text-decoration:none;display:flex}.training-hint>span:first-child{font-size:1.8rem}.unit{background:var(--surface);border:1px solid var(--border);border-top:4px solid var(--unit-color,var(--accent));border-radius:18px;margin:20px 0 8px;padding:16px}.unit-locked .level-node,.unit-locked .progress{opacity:.75}.unit-header{justify-content:space-between;gap:8px;display:flex}.unit-number{text-transform:uppercase;letter-spacing:.06em;color:var(--unit-color,var(--accent));font-size:.78rem;font-weight:700}:root[data-theme=light] .unit-number{color:color-mix(in srgb, var(--unit-color,var(--accent)) 50%, #000)}.unit-title h2{margin:2px 0 4px;font-size:1.25rem}.unit-title p{margin:0 0 12px;font-size:.92rem}.badge-passed{background:var(--success-bg);color:var(--success);border-radius:12px;flex:none;align-self:flex-start;padding:4px 10px;font-size:.82rem;font-weight:700}.progress{background:var(--surface-2);border-radius:5px;height:10px;overflow:hidden}.progress-fill{background:var(--success);height:100%;transition:width .4s var(--ease);border-radius:5px}.level-path{flex-direction:column;gap:14px;margin:16px 0 8px;padding:0;list-style:none;display:flex}.level-node-wrap{align-items:center;gap:14px;display:flex}.level-node-wrap.offset-1{padding-left:18%}.level-node-wrap.offset-2{padding-left:36%}.level-node{width:64px;height:64px;color:var(--accent-contrast);background:var(--unit-color,var(--accent));box-shadow:0 5px 0 color-mix(in srgb, var(--unit-color,var(--accent)) 60%, #000);transition:transform .12s var(--ease);border-radius:50%;flex:none;place-items:center;font-size:1.35rem;font-weight:800;text-decoration:none;display:grid}.level-node:active{box-shadow:0 2px 0 color-mix(in srgb, var(--unit-color,var(--accent)) 60%, #000);transform:translateY(3px)}.level-node.done{background:var(--gold);color:#3b2a00;box-shadow:0 5px 0 color-mix(in srgb, var(--gold) 60%, #000)}.level-node.locked{background:var(--surface-2);color:var(--text-faint);box-shadow:0 5px 0 var(--border);font-size:1.1rem}.level-node.current{outline:4px solid color-mix(in srgb, var(--unit-color,var(--accent)) 35%, transparent);outline-offset:4px;animation:node-bounce 1.6s var(--ease) infinite}@keyframes node-bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-4px)}}.level-label{font-size:.95rem;font-weight:600}.unit-actions{flex-direction:column;gap:8px;margin-top:12px;display:flex}.level-screen{padding-top:4px}.level-top{z-index:10;padding:calc(6px + var(--safe-top)) 0 10px;margin-top:calc(-1 * var(--safe-top));background:var(--bg);align-items:center;gap:10px;display:flex;position:sticky;top:0}.level-progress{border-radius:7px;flex:1;height:14px}.intro-card h2{margin:6px 0 12px;font-size:1.35rem}.intro-card .code-view{margin:12px 0}.dots{justify-content:center;gap:6px;margin:14px 0;display:flex}.dot{background:var(--surface-2);width:8px;height:8px;transition:all .2s var(--ease);border-radius:50%}.dot.active{background:var(--accent);border-radius:4px;width:22px}.phase-title{margin:4px 0 0}.example-card h3{font-size:1.05rem}.confirm{border-color:color-mix(in srgb, var(--danger) 40%, var(--border));margin-bottom:12px}.summary-card{text-align:center;animation:pop-in .36s var(--ease)}@keyframes pop-in{0%{opacity:0;transform:scale(.94)}}.summary-icon{font-size:3.2rem;line-height:1.1}.summary-card h2{margin:6px 0 12px}.summary-stats{justify-content:center;gap:24px;margin-bottom:8px;display:flex}.summary-stats div{flex-direction:column;display:flex}.summary-stats strong{color:var(--gold);font-variant-numeric:tabular-nums;font-size:1.6rem}.summary-stats span{color:var(--text-muted);font-size:.85rem}.recommend{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.code-view{border-radius:var(--radius-sm);background:var(--code-bg);border:1px solid var(--border);font-family:var(--font-code);-webkit-user-select:text;user-select:text;margin:0;padding:10px 0;font-size:15px;line-height:1.6;overflow-x:auto}.code-line{text-align:left;width:100%;min-height:1.6em;font:inherit;color:inherit;white-space:pre;background:0 0;border:0;padding:0 12px;display:flex}.code-view.clickable .code-line{min-height:var(--tap);cursor:pointer;border-left:3px solid #0000;align-items:center}.code-line .ln{width:2em;color:var(--code-gutter);-webkit-user-select:none;user-select:none;flex:none}.selected-line{background:color-mix(in srgb, var(--accent) 18%, transparent);border-left-color:var(--accent)!important}.bug-line{background:var(--code-error-line);border-left-color:var(--danger)!important}.wrong-line{background:color-mix(in srgb, var(--warn) 16%, transparent)}.fixed-line{background:var(--success-bg)}.tok-keyword{color:var(--tok-keyword);font-weight:600}.tok-string{color:var(--tok-string)}.tok-number{color:var(--tok-number)}.tok-comment{color:var(--tok-comment);font-style:italic}.tok-builtin{color:var(--tok-builtin)}.tok-operator{color:var(--tok-operator)}.tok-atom{color:var(--tok-atom)}.exercise{animation:screen-in .22s var(--ease);flex-direction:column;gap:14px;display:flex}.exercise-type{text-transform:uppercase;letter-spacing:.06em;color:var(--accent);font-size:.78rem;font-weight:700}.question{font-size:1.1rem;font-weight:600}.options{flex-direction:column;gap:10px;display:flex}.option{border:2px solid var(--border);background:var(--surface);min-height:52px;color:var(--text);text-align:left;cursor:pointer;touch-action:manipulation;border-bottom-width:4px;border-radius:14px;align-items:center;padding:10px 14px;font-size:1rem;transition:border-color .12s,background-color .12s,transform 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