@charset "UTF-8";
:root{--paper:#fafafa;--ink:#242424;--muted:#737373;--line:#e3e3e3;--flags:#3966ce;--width:#b16b17;--precision:#268251;--length:#9255b7;--specifier:#cc4b45;--mono:"Cascadia Code","SFMono-Regular",Consolas,"Liberation Mono",monospace;--sans:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--flags);outline-offset:5px}code,pre{font-family:var(--mono)}.page{max-width:1280px;margin:0 auto;padding:0 56px}.masthead{height:112px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.wordmark{font:600 29px var(--mono);letter-spacing:-1.4px;text-decoration:none}.wordmark span{color:var(--specifier)}.edition{display:flex;align-items:center;gap:14px;font-size:13px;letter-spacing:1px;color:var(--muted)}.edition>span:first-child{font-family:var(--mono);color:var(--ink)}.edition-divider{color:#bfbfbf}.anatomy{padding-top:43px}.section-line{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}.section-line h1{font-size:16px;font-weight:500;margin:0;letter-spacing:1px}.interaction-hint{font-size:13px;color:var(--muted)}.inspector{min-height:157px;display:grid;grid-template-columns:240px 1fr;gap:30px;padding:24px 28px;border:1px solid var(--line);background:#fff;border-radius:8px;position:relative}.inspector:before{content:"";position:absolute;left:-1px;top:26px;bottom:26px;width:3px;background:var(--segment-color);border-radius:3px}.segment-number{font:12px var(--mono);letter-spacing:1px;color:var(--segment-color)}.inspector h2{font-size:21px;margin:8px 0;font-weight:550;letter-spacing:1px}.inspector p{font-size:13px;color:var(--muted);line-height:1.7;margin:0}.choices{display:flex;flex-wrap:wrap;align-content:center;align-items:stretch;gap:8px}.choice{display:flex;gap:9px;align-items:center;padding:9px 11px;border:1px solid var(--line);border-radius:5px;font-size:13px;min-height:38px;background:var(--paper)}.choice code{font-size:15px;color:var(--segment-color);min-width:12px;text-align:center;font-weight:500;white-space:pre}.choice span{color:#616161}.syntax{display:flex;align-items:flex-start;justify-content:center;padding:37px 0 27px;user-select:none}.token,.syntax-prefix{display:flex;flex-direction:column;align-items:center;flex-shrink:0;border:0;background:transparent;padding:0;position:relative}.syntax-prefix{padding-right:4px}.syntax-code{font:500 clamp(1.45rem,6.7vw,5.75rem)/1.35 var(--mono);letter-spacing:-.04em;white-space:nowrap}.bracket{opacity:.4;font-weight:300}.token-caption{font-size:13px;line-height:20px;margin-top:13px;letter-spacing:2px;font-family:var(--sans)}.token{color:var(--segment-color);border-radius:6px;transition:background .16s,color .16s}.token:after{content:"";position:absolute;bottom:-10px;left:24%;right:24%;height:2px;background:var(--segment-color);opacity:0;transform:scaleX(.6);transition:opacity .16s,transform .16s}.token:hover:after,.token.is-active:after,.token.is-preview:after{opacity:1;transform:scaleX(1)}.token.is-active .bracket,.token:hover .bracket{opacity:.8}.token[data-segment=flags]{--segment-color:var(--flags)}.token[data-segment=width]{--segment-color:var(--width)}.token[data-segment=precision]{--segment-color:var(--precision)}.token[data-segment=length]{--segment-color:var(--length)}.token[data-segment=specifier]{--segment-color:var(--specifier)}.syntax-prefix .token-caption{color:var(--muted)}.syntax-note{display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:12px;line-height:1.7;margin:7px 0 42px}.syntax-note code{font-size:14px;color:#454545}.pinned-note{white-space:nowrap}.playground{border-top:1px solid var(--line);padding-top:31px}.playground-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.playground h2{font-size:22px;font-weight:550;letter-spacing:1px;margin:0}.heading-period{margin-left:3px;color:#9a9a9a}.live-label{font-size:12px;letter-spacing:1px;color:var(--muted)}.inputs{display:grid;grid-template-columns:1fr 1fr;gap:24px}.field label{display:flex;align-items:center;gap:12px;font-size:14px;margin-bottom:11px}.field label span{font:11px var(--mono);letter-spacing:1px;color:#888}.input-shell{display:flex;align-items:center;gap:12px;min-height:64px;border:1px solid #d9d9d9;border-radius:6px;padding:0 19px;background:white;transition:border-color .16s,box-shadow .16s}.input-shell:focus-within{border-color:#555;box-shadow:0 0 0 3px #24242408}.input-shell input{font:20px var(--mono);color:var(--ink);width:100%;min-width:0;border:0;background:transparent;outline:none;padding:18px 0}.input-shell:has(input[aria-invalid=true]){border-color:var(--specifier)}.input-quote{font:24px Georgia,serif;color:#aaa}.field-help{font-size:12px;color:var(--muted);line-height:1.7;margin:9px 0 0}.field-help code{font-size:12px}.examples{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:23px 0 24px;font-size:12px;color:var(--muted)}.examples>span{margin-right:4px}.examples button{border:1px solid var(--line);border-radius:4px;display:flex;align-items:center;gap:10px;background:transparent;color:var(--ink);padding:7px 11px;font-size:12px;transition:border-color .16s,background .16s}.examples button:hover{border-color:#aaa;background:#fff}.examples code{font-size:12px}.examples button span{color:var(--muted)}.output-panel{background:#202122;border-radius:7px;color:#f5f5f5;padding:19px 25px 23px;min-height:147px;overflow:hidden;transition:box-shadow .16s}.output-bar{display:flex;justify-content:space-between;align-items:center;color:#989b9d;font:11px var(--mono);letter-spacing:1.5px}.output-bar span:last-child{font-family:var(--sans);letter-spacing:0;font-size:12px}#output{font-size:clamp(23px,2.4vw,32px);line-height:1.5;min-height:48px;margin:22px 0 0;white-space:pre;overflow:auto;padding-bottom:3px}.output-panel.has-error{box-shadow:inset 0 0 0 1px var(--specifier)}.output-error{font-size:14px;color:#ffaaa6;line-height:1.7;margin:18px 0 0}.result-note{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin:13px 0 0;font-size:12px;line-height:1.8;color:var(--muted)}.result-note code{overflow-wrap:anywhere}.result-note>span{white-space:nowrap}footer{display:flex;justify-content:space-between;align-items:flex-start;border-top:1px solid var(--line);padding:24px 0 30px;margin-top:49px;gap:30px;font-size:12px;color:#898989}footer details{max-width:480px;text-align:right}footer summary{cursor:pointer;list-style:none;text-decoration:underline;text-underline-offset:4px}footer summary::-webkit-details-marker{display:none}footer details p{font-size:13px;line-height:1.8;text-align:left;color:var(--muted);margin:14px 0}footer details a{font-size:13px}
@media(min-width:1500px){.page{max-width:1376px;padding:0 72px}.anatomy{padding-top:57px}.section-line{margin-bottom:32px}.inspector{min-height:163px}.syntax{padding-top:47px;padding-bottom:34px}.syntax-code{font-size:6.1rem}.syntax-note{margin-bottom:50px}.playground{padding-top:35px}}
@media(max-width:1000px){.page{padding:0 32px}.masthead{height:88px}.anatomy{padding-top:32px}.inspector{grid-template-columns:185px 1fr;gap:20px;padding:20px;min-height:158px}.choice{padding:7px 9px;gap:7px}.syntax-code{font-size:6.5vw}.syntax{padding-top:32px}.syntax-note{margin-bottom:30px}.inputs{gap:18px}.examples{gap:8px}.result-note>span{display:none}}
@media(max-width:600px){.page{padding:0 20px}.masthead{height:78px}.wordmark{font-size:26px}.edition{font-size:11px;gap:9px;letter-spacing:0}.anatomy{padding-top:27px}.section-line{margin-bottom:20px}.section-line h1{font-size:15px}.interaction-hint{font-size:11px}.inspector{grid-template-columns:1fr;gap:14px;padding:19px 18px;min-height:230px}.inspector-heading{display:grid;grid-template-columns:1fr auto;gap:7px;align-items:center}.segment-number{font-size:11px}.inspector h2{font-size:18px;margin:0}.inspector p{grid-column:1/-1;font-size:12px}.choices{gap:6px;align-content:flex-start}.choice{font-size:12px;min-height:32px;padding:6px 8px}.choice code{font-size:13px}.syntax{padding:29px 0 23px}.syntax-code{font-size:6.35vw;letter-spacing:-.055em}.syntax-prefix{padding-right:1px}.token-caption{font-size:11px;letter-spacing:0;margin-top:10px}.syntax-note{font-size:11px;margin:7px 0 29px}.pinned-note{display:none}.playground{padding-top:24px}.playground-heading{margin-bottom:23px}.playground h2{font-size:20px}.inputs{grid-template-columns:1fr;gap:20px}.field label{margin-bottom:9px}.input-shell{min-height:57px;padding:0 16px}.input-shell input{font-size:18px;padding:15px 0}.examples{margin:22px 0 20px;gap:7px}.examples>span{width:100%;margin:0 0 2px}.examples button{gap:7px;padding:7px 8px}.examples button span{font-size:11px}.output-panel{padding:19px 19px 21px;min-height:140px}#output{font-size:27px}.result-note{font-size:11px;margin-top:11px}footer{margin-top:36px;padding-top:20px;font-size:11px;gap:15px}footer details{max-width:64%}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important}}
.masthead{height:86px;border-bottom:0}.anatomy{padding-top:36px}.inspector{grid-template-columns:100px 1fr;min-height:130px;align-items:center}.inspector h2{font-size:18px;margin:0}.syntax{padding-top:52px;padding-bottom:35px}.syntax-note{justify-content:center;margin-bottom:46px}.playground{padding-top:31px}.output-panel{margin-top:26px}.output-bar>span:first-child{font:12px var(--sans);letter-spacing:2px}footer{border:0;margin-top:0;padding-top:19px;justify-content:flex-end}.inspector-heading{display:block}
@media(min-width:1500px){.anatomy{padding-top:54px}.syntax{padding-top:65px;padding-bottom:41px}.syntax-note{margin-bottom:55px}}
@media(max-width:1000px){.inspector{grid-template-columns:90px 1fr}}
@media(max-width:600px){.masthead{height:72px}.anatomy{padding-top:21px}.inspector{grid-template-columns:1fr;min-height:196px;gap:13px;align-content:center}.syntax{padding-top:34px;padding-bottom:27px}.syntax-note{margin-bottom:29px}.output-panel{margin-top:24px}footer{margin-top:0}.inspector h2{font-size:16px}.syntax .token-caption{font-size:10px}}
.format-editor{position:relative;flex:1;min-width:0;overflow:hidden}.input-highlight{position:absolute;inset:0;display:flex;align-items:center;pointer-events:none;overflow:hidden;font:20px var(--mono);white-space:pre}.input-highlight>span{display:block;flex-shrink:0;will-change:transform}.format-editor input{position:relative;color:transparent;caret-color:var(--ink);-webkit-text-fill-color:transparent}.format-editor input::placeholder{color:#a0a0a0;-webkit-text-fill-color:#a0a0a0}.format-editor input::selection{background:#3966ce30;color:transparent}.inspector{min-height:190px}
@media(max-width:600px){.input-highlight{font-size:18px}.inspector{min-height:196px}}
@media(forced-colors:active){.format-editor input{color:CanvasText;-webkit-text-fill-color:CanvasText}.input-highlight{display:none}}
/* Stable page geometry: only the contents of the reserved inspector change. */
.masthead{display:flex;align-items:center;justify-content:space-between}
.anatomy{display:grid;grid-template-rows:190px 242px 44px;padding-top:36px}
.inspector{height:190px;min-height:0;grid-template-columns:100px minmax(0,1fr);align-items:center;overflow:hidden}
.choices{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));grid-auto-rows:38px;gap:8px;align-content:start;align-items:start;height:130px;overflow:auto}
.choice{display:grid;grid-template-columns:45px minmax(0,1fr);gap:5px;height:38px;min-height:0;padding:6px 8px}
.choice code{font-size:14px;text-align:left}.choice span{font-size:12px;line-height:1.35;overflow-wrap:anywhere}
.syntax{display:grid;grid-template-columns:1fr 4fr 4fr 5fr 4fr 2fr;align-items:start;justify-items:center;width:100%;height:242px;padding:47px 0 30px}
.token,.syntax-prefix{display:grid;grid-template-rows:auto 20px;justify-items:center;align-content:start}
.syntax-prefix{padding:0}.token-caption{margin-top:13px}.syntax-note{height:44px;margin:0;display:block;text-align:center}
.playground{display:grid;grid-template-rows:auto auto;row-gap:26px;padding-top:31px}.output-panel{margin-top:0}
.input-shell{display:grid;grid-template-columns:14px minmax(0,1fr) 14px;gap:12px}.field:not(.format-field) .input-shell{grid-template-columns:minmax(0,1fr)}
.output-bar{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px}.output-bar span:last-child{text-align:right}
footer{display:grid;justify-items:end}
@media(min-width:1500px){.anatomy{padding-top:54px;grid-template-rows:190px 265px 48px}.syntax{height:265px;padding-top:62px}.syntax-note{height:48px}}
@media(max-width:1100px) and (min-width:601px){.anatomy{grid-template-rows:224px 210px 42px}.inspector{height:224px;grid-template-columns:80px minmax(0,1fr);padding:20px}.choices{grid-template-columns:repeat(4,minmax(0,1fr));height:184px}.syntax{height:210px;padding-top:42px}.syntax-note{height:42px}.choice{grid-template-columns:38px minmax(0,1fr);padding:5px}}
@media(max-width:600px){.anatomy{padding-top:21px;grid-template-rows:324px 155px 38px}.inspector{height:324px;grid-template-columns:minmax(0,1fr);grid-template-rows:22px 230px;gap:15px;align-content:start;padding:19px 18px}.choices{grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:40px;height:230px;gap:6px;overflow:auto}.choice{height:40px;grid-template-columns:minmax(0,1fr);grid-template-rows:16px 16px;gap:0;padding:4px 5px}.choice code{font-size:12px}.choice span{font-size:10px;line-height:1.3;overflow-wrap:normal}.syntax{height:155px;padding:34px 0 23px}.syntax-note{height:38px}.playground{row-gap:24px;padding-top:24px}.input-shell{gap:10px}.output-panel{margin-top:0}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.token-caption{white-space:nowrap;word-break:keep-all}
:root{--literal:var(--muted)}
.output-panel{display:grid;align-content:center;padding:25px}.output-panel #output{margin:0}.output-error{margin:0}
.anatomy{grid-template-rows:112px 242px 44px}
.inspector{height:112px;display:block;border:0;border-radius:0;background:transparent;padding:0;overflow:hidden}.inspector:before{display:none}
.choices{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));grid-auto-rows:34px;gap:12px 14px;height:100%;align-content:center;overflow:hidden}
.choice{display:block;height:34px;border:0;border-radius:0;background:transparent;padding:0;text-align:center;line-height:34px}
.choice code{font-size:19px;font-weight:500;text-align:center;line-height:34px}
@media(min-width:1500px){.anatomy{grid-template-rows:112px 265px 48px}}
@media(max-width:1100px) and (min-width:601px){.anatomy{grid-template-rows:112px 210px 42px}.inspector{height:112px;padding:0}.choices{height:112px}}
@media(max-width:600px){.anatomy{grid-template-rows:154px 155px 38px}.inspector{height:154px;display:block;padding:0}.choices{grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:26px;height:154px;gap:8px 10px;align-content:center}.choice{height:26px;padding:0;line-height:26px}.choice code{font-size:15px;line-height:26px}}
.choice{cursor:help}.choice:hover code{text-decoration:underline;text-underline-offset:5px}.choice:focus-visible{outline-color:var(--segment-color);outline-offset:3px}
.rule-tooltip{position:fixed;z-index:20;width:max-content;max-width:min(340px,calc(100vw - 24px));padding:10px 13px;border:1px solid var(--line);border-radius:5px;background:#fff;color:var(--ink);box-shadow:0 4px 18px #0000000d;font:14px/1.65 var(--sans);overflow-wrap:anywhere}.rule-tooltip[hidden]{display:none}
.anatomy{grid-template-rows:112px 242px}
@media(min-width:1500px){.anatomy{grid-template-rows:112px 265px}}
@media(max-width:1100px) and (min-width:601px){.anatomy{grid-template-rows:112px 210px}}
@media(max-width:600px){.anatomy{grid-template-rows:154px 155px}}
#output [data-part="specifier"]{color:#f18d87}#output [data-part="literal"]{color:#b6b8ba}
#output [data-part="count"]::after{content:attr(data-value);margin:0 .12em;font-size:.42em;vertical-align:super;color:#f18d87;opacity:.75}
.reset{display:grid;place-items:center;width:38px;height:38px;margin-right:-9px;padding:0;border:0;border-radius:8px;background:transparent;color:var(--muted);transition:color .16s,background .16s,opacity .16s}.reset:hover{color:var(--ink);background:#0000000a}.reset:focus-visible{outline-offset:2px}.reset:disabled{opacity:.35;cursor:default;color:var(--muted);background:transparent}.reset svg{width:20px;height:20px}.reset.is-spinning svg{animation:reset-spin .45s ease}
@keyframes reset-spin{to{transform:rotate(-360deg)}}
@media(prefers-reduced-motion:reduce){.reset.is-spinning svg{animation:none}}