:root{--color-sky-1:var(--pf-sky-1);--color-sky-2:var(--pf-sky-2);--color-sky-3:var(--pf-sky-3);--color-sky-4:var(--pf-sky-4);--color-sky-5:var(--pf-sky-5);--color-cloud:var(--pf-cloud);--color-wall:var(--pf-wall-base);--color-wall-deep:var(--pf-wall-forest);--color-rim:var(--pf-rim-2);--color-rim-hi:var(--pf-rim-1);--color-rim-lo:var(--pf-rim-4);--color-sand:var(--pf-sand);--color-ink:var(--pf-outline);--color-ink-2:oklch(34% .06 140);--color-beak:var(--beak);--color-beak-deep:oklch(52% .12 62);--color-bird:#338773;--color-bird-eye:#f3efe2;--color-on-wall:oklch(97% .03 120);--color-on-wall-2:oklch(88% .06 125);--color-link:oklch(42% .14 250);--color-link-on-wall:oklch(92% .1 110);--color-focus:oklch(42% .16 250);--color-scrim:oklch(25% .05 140/.45);--font-display:"Lilita One", "Arial Rounded MT Bold", system-ui, sans-serif;--font-body:"Figtree", system-ui, sans-serif;--outline:3px;--shadow-hard:6px 6px 0 var(--color-ink);--radius:14px;--container:72rem;--measure:44rem;--gutter:clamp(16px, 4vw, 40px);--ease-snap:cubic-bezier(.22, 1, .36, 1);--color-card:color-mix(in oklab, var(--color-sand) 38%, var(--color-cloud));--paper-surface:var(--surface);--paper-panel:var(--surface-panel);--paper-ink:var(--ink);--paper-ink-muted:var(--ink-muted);--paper-ink-soft:var(--ink-soft);--paper-accent:var(--accent);--paper-line:var(--line)}.sky{--font:var(--font-body);min-height:100vh;color:var(--color-ink);font:400 18px/1.55 var(--font-body);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}html:has(.sky){background:var(--color-sky-5);overflow-x:clip}html:has(.sky) body{background:var(--color-sky-5);overflow-x:clip}.sky :is(h1,h2,h3){font-family:var(--font-display);overflow-wrap:break-word;text-wrap:balance;min-width:0;font-weight:400;line-height:1.02}.sky h1{font-size:clamp(3rem,7.4vw,6.2rem)}.sky h2{font-size:clamp(2.1rem,4.4vw,3.6rem)}.sky h3{font-size:1.45rem}.sky 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var(--color-ink);cursor:pointer;white-space:nowrap;transition:translate .12s var(--ease-snap), box-shadow .12s var(--ease-snap), background-color .12s var(--ease-snap);justify-content:center;align-items:center;padding:4px 24px 0;text-decoration:none;display:inline-flex}.sky .sky-btn{color:var(--color-ink)}.sky-btn:hover:not(:disabled){box-shadow:0 7px 0 var(--color-ink);translate:0 -2px}.sky-btn:active:not(:disabled){box-shadow:0 1px 0 var(--color-ink);translate:0 4px}.sky-btn:disabled{opacity:.55;cursor:not-allowed}.sky-btn-ghost{box-shadow:none;background:0 0}.sky-btn-ghost:hover:not(:disabled){box-shadow:none;background:var(--color-cloud)}.sky-btn-ghost:active:not(:disabled){box-shadow:none}.sky-btn-small{min-height:44px;padding:4px 16px 0;font-size:1.05rem}.sky-center{justify-self:center}.sky-chip{border:2px solid var(--color-ink);min-height:44px;font:600 1rem/1 var(--font-body);color:var(--color-ink);background:var(--color-cloud);box-shadow:0 4px 0 var(--color-ink);cursor:pointer;transition:translate .12s var(--ease-snap), box-shadow .12s var(--ease-snap);border-radius:999px;align-items:center;gap:4px;padding:0 16px;display:inline-flex}.sky-chip:hover{box-shadow:0 5px 0 var(--color-ink);translate:0 -1px}.sky-chip:active{box-shadow:0 0 0 var(--color-ink);translate:0 4px}.sky-chip[aria-checked=true]{background:var(--color-beak)}.sky-chip-pinyin{font-weight:400}.sky-tags{flex-wrap:wrap;gap:8px;list-style:none;display:flex}.sky-tags li{border:2px solid var(--color-ink);background:var(--color-cloud);border-radius:999px;padding:8px 16px;font-size:.92rem;font-weight:600}.sky-panel{border:var(--outline) solid var(--color-ink);border-radius:var(--radius);background:var(--color-cloud);box-shadow:var(--shadow-hard);padding:12px}.sky-ground{color:var(--color-on-wall);margin-top:40px;position:relative}.sky-ground>.sky-inner{background:var(--color-wall);padding:24px max(var(--gutter), calc((100% - var(--container)) / 2 + var(--gutter))) 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.sky-brand{font-size:1.3rem}.sky-nav-bar.is-compact .sky-brand .pip{width:30px;height:30px}.sky-scrollbird{z-index:15;border:2px solid var(--color-ink);background:var(--color-sky-5);width:48px;height:48px;box-shadow:2px 2px 0 var(--color-ink);transition:translate .12s var(--ease-snap);border-radius:50%;place-items:center;display:grid;position:fixed;bottom:16px;left:16px}.sky-scrollbird:hover{translate:0 -2px}.sky-scrollbird:active{translate:0 2px}.sky-scrollbird-bird{will-change:transform;line-height:0;display:block}@media (prefers-reduced-motion:reduce){.sky-nav-bar,.sky-nav{transition:none}}.sky-nav-links{gap:4px;margin-left:auto;list-style:none;display:flex}.sky .sky-nav-links>li>a,.sky-learn>summary{min-height:40px;color:var(--color-ink);cursor:pointer;border-radius:10px;align-items:center;padding:0 12px;font-size:.98rem;font-weight:600;text-decoration:none;list-style:none;display:inline-flex}.sky-learn>summary::-webkit-details-marker{display:none}.sky 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* var(--gutter));padding-inline:12px}.sky-burger{border:2px solid var(--color-ink);border-radius:var(--radius);background:var(--color-cloud);width:44px;height:44px;color:var(--color-ink);cursor:pointer;flex:none;place-items:center;display:inline-grid}.sky-burger svg{fill:none;stroke:currentColor;stroke-width:2.5px;stroke-linecap:round;width:24px;height:24px}.sky-burger:active{translate:0 2px}.sky-menu{margin:8px var(--gutter) 0;border:var(--outline) solid var(--color-ink);border-radius:var(--radius);background:var(--color-sky-5);box-shadow:4px 4px 0 var(--color-ink);gap:8px;padding:16px;display:grid}.sky-menu ul{list-style:none;display:grid}.sky-menu h3{margin-top:8px;font-size:1.05rem}.sky .sky-menu a{min-height:44px;color:var(--color-ink);border-radius:8px;align-items:center;padding:0 8px;font-weight:600;text-decoration:none;display:flex}.sky .sky-menu a:hover{background:var(--color-cloud)}}.sky-footer{max-width:var(--container);padding-inline:var(--gutter);margin:72px auto 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.footer-grid{flex-wrap:nowrap;gap:32px}.sky-footer .footer-brand{flex:0 14em;max-width:14em}}.sky-site{--surface:var(--color-cloud);--surface-panel:var(--color-sky-5);--surface-deep:var(--color-sky-4);--ink:var(--color-ink);--ink-muted:var(--color-ink-2);--ink-soft:var(--color-ink-2);--ink-dim:var(--color-ink-2);--accent:var(--color-wall);--accent-rgb:43, 110, 42;--accent-ink:var(--color-on-wall);--accent-bright:var(--color-wall-deep);--line:color-mix(in oklab, var(--color-ink) 18%, transparent);--line-soft:color-mix(in oklab, var(--color-ink) 9%, transparent);--line-strong:color-mix(in oklab, var(--color-ink) 30%, transparent);background:var(--color-sky-5)}.sky-site .sky-nav-bar:not(.is-compact){background:var(--color-sky-5)}.sky-site-main{max-width:var(--container);padding:clamp(16px, 3vw, 40px) var(--gutter) 0;max-width:1120px;margin-inline:auto}.sky-site .legal-body,.sky-site .site-wide .tm-head,.sky-site .legal-body 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article>section{gap:var(--space-3);margin-top:var(--space-6);flex-direction:column;display:flex}.site-page ul.site-rules{gap:var(--space-2);color:var(--ink-muted);flex-direction:column;padding-left:1.2em;line-height:1.6;display:flex}.site-page code{background:var(--surface-panel);color:var(--ink);border-radius:4px;padding:0 4px}.site-tone-chart{gap:var(--space-2);flex-direction:column;margin:0;display:flex}.site-tone-chart svg{width:100%;max-width:520px;height:auto}.site-tone-chart .grid{stroke:var(--line);stroke-width:1px}.site-tone-chart .axis{fill:var(--ink-muted);font-size:11px}.site-tone-chart figcaption{gap:var(--space-2) var(--space-3);flex-wrap:wrap;font-size:.85rem;display:flex}.site-tone-chart .legend{font-weight:600}.site-tone-chart .note{color:var(--ink-muted);flex-basis:100%}.site-examples{justify-content:center;gap:var(--space-2);grid-template-columns:repeat(auto-fit,156px);padding:0;list-style:none;display:grid}.site-examples li,.site-examples li{background:var(--surface-panel);border-radius:var(--radius-md);padding:var(--space-3) var(--space-4);flex-direction:column;align-items:flex-start;gap:4px;display:flex}.site-examples li{text-align:center;align-items:center}.site-examples li>span{display:block}.screen .site-play{margin-top:var(--space-2);font:inherit;border:1.5px solid var(--ink);border-radius:var(--radius-pill);background:var(--surface);color:var(--ink);cursor:pointer;align-items:center;gap:8px;padding:4px 12px 4px 8px;font-size:.85rem;font-weight:600;display:inline-flex}.screen .site-play svg path{fill:currentColor}.screen .site-play[data-state=playing]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.screen .site-play[data-state=playing] svg path{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round}.screen .site-play[data-state=failed]{color:var(--ink-muted);border-color:var(--ink-soft)}.site-examples .site-example-actions{justify-content:center;gap:var(--space-4);margin-top:var(--space-2);display:flex}.screen .site-example-actions .site-play{color:var(--ink-muted);background:0 0;border:none;flex-direction:column;gap:4px;margin:0;padding:0;font-size:.75rem;font-weight:600}.screen .site-example-actions .site-play svg{box-sizing:content-box;border:1.5px solid var(--ink);background:var(--surface);width:16px;height:16px;color:var(--ink);border-radius:50%;padding:8px}.screen .site-example-actions .site-play:hover svg{background:var(--ink);color:var(--surface)}.screen .site-example-actions .site-play[data-state=playing]{color:var(--accent);background:0 0}.screen .site-example-actions .site-play[data-state=playing] svg{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.screen .site-see svg path{fill:none;stroke:currentColor;stroke-width:2.2px;stroke-linecap:round}.word-viewer{box-sizing:border-box;width:min(440px,100% - 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