@font-face{font-family:Onest;font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/onest-latin-ext-variable-BB1CCQzJ.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:Onest;font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/onest-latin-variable-BXvespbm.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:Unbounded;font-style:normal;font-weight:200 900;font-display:swap;src:url(/assets/unbounded-latin-ext-variable-gahC9mFq.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:Unbounded;font-style:normal;font-weight:200 900;font-display:swap;src:url(/assets/unbounded-latin-variable-CRXBNjfR.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:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/inter-latin-ext-variable-B_-bZUTo.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:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/inter-latin-variable-8kRkwJBP.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}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--platform-paper:oklch(97.8% .014 292);--platform-paper-strong:oklch(95.2% .026 292);--platform-card:var(--platform-paper);--platform-ink:oklch(22% .055 282);--platform-ink-muted:oklch(46% .044 282);--platform-ink-muted-strong:oklch(34% .047 282);--platform-violet:oklch(43% .235 291);--platform-violet-strong:oklch(36% .22 291);--platform-citron:oklch(89% .185 116);--platform-coral:oklch(72% .18 32);--platform-focus:var(--platform-coral);--platform-on-accent:oklch(20% .045 282);--platform-primary-foreground:white;--platform-selected:var(--platform-citron);--platform-selected-foreground:var(--platform-on-accent);--platform-line:oklch(79% .04 289);--platform-line-strong:oklch(62% .06 287);--platform-danger:#a23126;--platform-danger-surface:#ffede4;--platform-success:#28613d;--platform-success-surface:#e5f4da;--platform-rare-ink:#24627b;--platform-rare-surface:#e5f1f7;--platform-gold-ink:#795d1b;--platform-gold-surface:#fbefc9;--platform-font-sans:"Onest", system-ui, sans-serif;--platform-font-display:"Unbounded", "Onest", system-ui, sans-serif;--platform-radius:2px;--platform-control-radius:2px;--platform-menu-border-width:2px;--platform-shadow:6px 6px 0 color-mix(in oklch, var(--platform-line) 75%, transparent);--platform-active-shadow:2px 2px 0 var(--platform-violet);--platform-menu-shadow:5px 5px 0 var(--platform-line);--platform-editor-paper:var(--platform-paper);--platform-editor-ink:var(--platform-ink);--platform-editor-muted:var(--platform-ink-muted);--platform-editor-line:var(--platform-line);--platform-editor-accent:var(--platform-violet);--platform-editor-selection:var(--platform-violet);--platform-editor-selection-ink:var(--platform-primary-foreground);--platform-soft-accent:color-mix(in oklch, var(--platform-citron) 35%, var(--platform-paper))}:root.dark{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--platform-paper:oklch(18% .038 286);--platform-paper-strong:oklch(21.5% .046 286);--platform-ink:oklch(94% .016 292);--platform-ink-muted:oklch(73% .034 290);--platform-ink-muted-strong:oklch(82% .026 290);--platform-violet:oklch(72% .19 292);--platform-violet-strong:oklch(77% .17 292);--platform-citron:oklch(86% .17 116);--platform-coral:oklch(74% .17 32);--platform-primary-foreground:var(--platform-on-accent);--platform-line:oklch(34% .055 287);--platform-line-strong:oklch(50% .07 287);--platform-danger:#ffb3a7;--platform-danger-surface:#3b2027;--platform-success:#a4ddad;--platform-success-surface:#203329;--platform-rare-ink:#a4d8ef;--platform-rare-surface:#1b303c;--platform-gold-ink:#edcf85;--platform-gold-surface:#342c1e;--platform-soft-accent:color-mix(in oklch, var(--platform-citron) 12%, var(--platform-paper))}:root[data-interface-theme=onia-v1]{--platform-paper:#fff;--platform-paper-strong:#f1f5f9;--platform-card:#fff;--platform-ink:#0f1729;--platform-ink-muted:#65758b;--platform-ink-muted-strong:color-mix(in oklch, var(--platform-ink) 82%, var(--platform-ink-muted));--platform-violet:#2463eb;--platform-violet-strong:#1555e0;--platform-citron:#7c3bed;--platform-coral:#0da2e7;--platform-focus:var(--platform-violet);--platform-on-accent:white;--platform-primary-foreground:white;--platform-selected:var(--platform-violet);--platform-selected-foreground:var(--platform-primary-foreground);--platform-line:#e1e7ef;--platform-line-strong:color-mix(in oklch, var(--platform-line) 78%, var(--platform-ink));--platform-font-sans:"Inter", system-ui, sans-serif;--platform-font-display:"Inter", system-ui, sans-serif;--platform-radius:12px;--platform-control-radius:8px;--platform-menu-border-width:1px;--platform-shadow:0 1px 3px #0f172914, 0 10px 28px #0f17290b;--platform-active-shadow:0 1px 2px #0f17291f;--platform-menu-shadow:0 18px 45px #0f172929;--platform-soft-accent:color-mix(in oklch, var(--platform-citron) 10%, var(--platform-paper))}:root.dark[data-interface-theme=onia-v1]{--platform-paper:#0f1729;--platform-paper-strong:#1d283a;--platform-card:#1d283a;--platform-ink:#f8fafc;--platform-ink-muted:#9aa1ac;--platform-violet:#5284ef;--platform-violet-strong:#6a95f1;--platform-citron:#8e5ce6;--platform-coral:#35b7f3;--platform-on-accent:#0f1729;--platform-primary-foreground:#0f1729;--platform-line:#293851;--platform-shadow:0 1px 3px #0003, 0 10px 28px #0000001f;--platform-menu-shadow:0 18px 45px #0000004d}:root{font-family:var(--platform-font-sans);color:var(--platform-ink);background:var(--platform-paper);font-synthesis:none;--editor-paper:var(--platform-editor-paper);--editor-ink:var(--platform-editor-ink);--editor-muted:var(--platform-editor-muted);--editor-line:var(--platform-editor-line);--success-ink:var(--platform-success);--error-ink:var(--platform-danger);--font-code:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;font-size:14px;font-weight:400}*{box-sizing:border-box}body{margin:0}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid var(--platform-focus);outline-offset:3px}a{color:inherit;text-decoration:none}.lab{max-width:1100px;margin:0 auto;padding:28px}.embedded{padding:22px}.standalone{padding-top:30px}.standalone-header{border-bottom:1px solid var(--platform-line-strong);justify-content:space-between;align-items:center;gap:16px;margin-bottom:40px;padding-bottom:20px;font-size:13px;display:flex}.brand{align-items:center;gap:5px;font-size:24px;font-weight:750;display:flex}.brand>span{color:var(--platform-violet)}.standalone-header>a:last-child:hover{color:var(--platform-violet);text-decoration:underline}.challenge-eyebrow{letter-spacing:1.2px;color:var(--platform-violet);flex-wrap:wrap;align-items:center;gap:9px;font-size:10px;font-weight:700;display:flex}.eyebrow-dot{background:var(--platform-citron);width:7px;height:7px;box-shadow:2px 2px 0 var(--platform-violet)}.free-tag{letter-spacing:0;color:var(--platform-ink-muted);margin-left:auto;font-size:11px;font-weight:500}h1{font-family:var(--platform-font-display);letter-spacing:-.04em;overflow-wrap:anywhere;text-wrap:balance;margin:16px 0 12px;font-size:clamp(20px,3vw,25px);font-weight:640;line-height:1.25}.challenge p{color:var(--platform-ink-muted-strong);white-space:pre-line;margin:0 0 24px;font-size:14px;line-height:1.7}.challenge code,.hint code{font:.92em/1.6 var(--font-code);color:var(--platform-ink);overflow-wrap:anywhere}.challenge h2{margin:0 0 9px;font-size:13px;line-height:1.5}.function-signature{background:var(--platform-paper-strong);border:1px solid var(--platform-line);border-radius:var(--platform-radius);flex-wrap:wrap;align-items:center;gap:8px 14px;margin-bottom:22px;padding:12px 14px;display:flex}.function-signature>span{color:var(--platform-ink-muted);font-size:11px}.function-signature>code{font-weight:650}.requirements{margin-bottom:22px}.requirements ul{color:var(--platform-ink-muted-strong);margin:0;padding-left:21px;font-size:13px;line-height:1.7}.requirements li+li{margin-top:7px}.examples{margin-bottom:24px}.example{border:1px solid var(--platform-line);border-radius:var(--platform-radius);padding:12px 14px}.example+.example{margin-top:8px}.example dl,.test-comparison{gap:7px;margin:0;display:grid}.example dl>div,.test-comparison>div{grid-template-columns:85px minmax(0,1fr);align-items:baseline;gap:10px;display:grid}.example dt,.test-comparison dt{color:var(--platform-ink-muted);font-size:10px;font-weight:650}.example dd,.test-comparison dd{min-width:0;margin:0}.example dd code,.test-comparison dd code{font:12px/1.6 var(--font-code);white-space:pre-wrap;overflow-wrap:anywhere}.example p{margin:8px 0 0;font-size:12px}.code-panel{background:var(--editor-paper);border-radius:var(--platform-radius);border:1px solid var(--platform-line-strong);box-shadow:var(--platform-shadow);overflow:hidden}.code-panel:focus-within{outline:3px solid var(--platform-focus);outline-offset:3px}.editor-toolbar{border-bottom:1px solid var(--editor-line);height:49px;color:var(--editor-ink);justify-content:space-between;align-items:center;padding:0 18px;font-size:11px;display:flex}.file-label{align-items:center;gap:9px;display:flex}.python-mark{color:var(--platform-editor-accent);font:600 11px var(--font-code)}.file-dot{background:var(--editor-muted);border-radius:100%;width:5px;height:5px;margin-left:3px}.editor-note{color:var(--editor-muted);font-size:10px}.editor-body{height:245px;padding:19px 0 10px;display:flex;position:relative}.line-numbers{color:var(--editor-muted);text-align:right;min-width:46px;font:12px/24px var(--font-code);-webkit-user-select:none;user-select:none;padding:0 12px 0 8px;overflow:hidden}.editor-body textarea{box-shadow:none;min-width:0;height:100%;min-height:100%;color:var(--editor-ink);font:12px/24px var(--font-code);tab-size:4;caret-color:var(--platform-editor-accent);resize:none;background:0 0;border:0;outline:none;flex:1;padding:0 18px 0 4px}.editor-body textarea::selection{background:var(--platform-editor-selection);color:var(--platform-editor-selection-ink)}.editor-bottom{min-height:37px;color:var(--editor-muted);border-top:1px solid var(--editor-line);justify-content:space-between;align-items:center;gap:12px;padding:8px 17px;font-size:10px;display:flex}.actions{flex-wrap:wrap;justify-content:space-between;gap:12px;padding:20px 0;display:flex}.primary-actions,.secondary-actions{align-items:center;gap:8px;display:flex}.primary-actions{margin-left:auto}.action-help{color:var(--platform-ink-muted);margin:-7px 0 20px;font-size:11px;line-height:1.7}.action-help strong{color:var(--platform-ink-muted-strong);font-weight:600}.button{border-radius:var(--platform-radius);white-space:nowrap;border:1px solid #0000;justify-content:center;align-items:center;gap:7px;min-height:44px;padding:0 14px;font-size:12px;font-weight:650;transition:background-color .15s,color .15s,border-color .15s,transform .15s;display:inline-flex}.button:active:not(:disabled){transform:translateY(1px)}.text-button,.icon-button{color:var(--platform-ink-muted-strong);background:0 0}.text-button{padding-left:4px}.text-button:hover,.icon-button:hover{background:var(--platform-paper-strong);border-color:var(--platform-line);color:var(--platform-violet)}.icon-button{min-width:44px;padding:0 12px}.run-button{background:var(--platform-paper);border-color:var(--platform-line-strong);color:var(--platform-ink)}.run-button:hover{background:var(--platform-paper-strong);border-color:var(--platform-violet)}.verify-button{background:var(--platform-violet);border-color:var(--platform-violet);color:var(--platform-primary-foreground);box-shadow:var(--platform-active-shadow)}.verify-button:hover:not(:disabled){background:var(--platform-violet-strong)}.stop-button{background:color-mix(in oklch, var(--platform-coral) 20%, var(--platform-paper));border-color:var(--platform-coral);color:var(--error-ink)}.stop-icon{background:currentColor;width:9px;height:9px}.hint{border:1px solid var(--platform-line-strong);border-left:4px solid var(--platform-citron);background:var(--platform-paper-strong);border-radius:var(--platform-radius);color:var(--platform-ink-muted-strong);gap:12px;margin:0 0 18px;padding:15px;font-size:12px;display:flex}.hint>svg{color:var(--platform-violet);flex:none;margin-top:1px}.hint strong{color:var(--platform-ink);font-size:13px}.hint p{white-space:pre-line;margin:6px 0 0;line-height:1.7}.console{border:1px solid var(--platform-line-strong);border-radius:var(--platform-radius);background:var(--platform-paper);overflow:hidden}.console-header{border-bottom:1px solid var(--platform-line);background:var(--platform-paper-strong);justify-content:space-between;align-items:center;gap:10px;padding:14px 17px;display:flex}.console-header h2{margin:0;font-size:13px;font-weight:650}.status{color:var(--platform-ink-muted);align-items:center;gap:6px;font-size:10px;display:flex}.status:before{content:"";background:var(--platform-ink-muted);border-radius:50%;flex-shrink:0;width:6px;height:6px}.status-working{color:var(--platform-violet)}.status-working:before{background:var(--platform-violet)}.status-success{color:var(--success-ink)}.status-success:before{background:var(--success-ink)}.console-content{min-height:90px;max-height:350px;padding:17px;overflow:auto}.console-content pre,.test-results pre{font:12px/1.8 var(--font-code);white-space:pre-wrap;overflow-wrap:anywhere;color:var(--platform-ink-muted-strong);margin:0}.console-placeholder{color:var(--platform-ink-muted);align-items:center;gap:9px;margin:0;font-size:12px;line-height:1.8;display:flex}.console-placeholder>span:first-child:not(.spinner){color:var(--platform-violet);font:18px monospace}.console-content pre.error-output{color:var(--error-ink)}.test-results{border-top:1px solid var(--platform-line);padding:16px}.test-heading{justify-content:space-between;align-items:center;gap:8px;font-size:12px;display:flex}.test-heading>span{color:var(--platform-ink-muted);font-size:10px}.test-results ul{gap:9px;margin:13px 0 0;padding:0;list-style:none;display:grid}.test-results li{gap:9px;font-size:12px;line-height:1.7;display:flex}.test-results li+li{border-top:1px solid var(--platform-line);padding-top:13px}.test-detail{flex:1;min-width:0}.test-call{font:11px/1.7 var(--font-code);color:var(--platform-ink-muted);overflow-wrap:anywhere;margin-top:3px;display:block}.test-message{color:var(--platform-ink-muted-strong);margin:8px 0}.test-comparison{background:var(--platform-paper-strong);border-left:3px solid var(--error-ink);padding:10px 12px}.test-comparison dd code{color:var(--platform-ink)}.verification-note{color:var(--platform-ink-muted-strong);margin:0;padding:0 17px 17px;font-size:12px;line-height:1.7}.test-symbol{border-radius:50%;flex:none;justify-content:center;align-items:center;width:19px;height:19px;font-weight:700;display:inline-flex}.passed .test-symbol{color:var(--success-ink);background:var(--platform-success-surface)}.failed .test-symbol{color:var(--error-ink);background:var(--platform-danger-surface)}.failed details{margin-top:7px}.failed summary{color:var(--error-ink);cursor:pointer;font-size:11px}.test-results pre{color:var(--error-ink);margin-top:7px;font-size:11px}.success-message{background:var(--platform-success-surface);border-left:3px solid var(--success-ink);color:var(--success-ink);margin:16px 0 0;padding:12px;font-size:12px;line-height:1.7}.privacy-note{color:var(--platform-ink-muted);margin:16px 0 0;font-size:11px;line-height:1.6}.spinner{border:2px solid var(--platform-line);border-top-color:var(--platform-violet);border-radius:50%;flex:none;width:13px;height:13px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.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}@media (width<=550px){.embedded{padding:16px}.lab:not(.embedded){padding:18px}.button{padding:0 12px;font-size:12px}.icon-button{min-width:44px}.editor-note{display:none}.editor-body{height:260px}.editor-bottom{padding:8px 11px;font-size:10px}h1{font-size:20px}.challenge p{font-size:13px}.test-heading{flex-direction:column;align-items:flex-start}.example dl>div,.test-comparison>div{grid-template-columns:minmax(0,1fr);gap:2px}.standalone-header{flex-wrap:wrap;align-items:flex-start;margin-bottom:30px}.console-header{flex-wrap:wrap;padding:13px}.status{font-size:10px}}@media (prefers-reduced-motion:reduce){.spinner{animation:none}.button{transition:none}}.button{border-radius:var(--platform-control-radius)}html[data-interface-theme=onia-v1] h1{letter-spacing:-.035em;font-weight:700}html[data-interface-theme=onia-v1] .eyebrow-dot{box-shadow:none;background:var(--platform-violet);border-radius:50%}.library-note{color:var(--platform-ink-muted);font-size:.875rem}.plot-output{border:1px solid var(--platform-line);background:var(--platform-paper-strong);min-width:0;margin-top:1.5rem;padding:1.25rem}.plot-output h2{margin:0 0 1rem;font-size:1rem}.plot-output figure{margin:1rem 0 0}.plot-output img{background:#fff;width:auto;max-width:100%;height:auto;margin:0 auto;display:block}.plot-output figcaption{color:var(--platform-ink-muted);overflow-wrap:anywhere;margin-top:.5rem;font-size:.875rem}