:root{color-scheme:light;--paper:#f2f3ef;--ink:#253037;--muted:#55636a;--rule:#c7cfce;--control:#718087;--quiz:#81601b;--quiz-button:#ebce83;--quiz-on:#292315;--review:#a5482b;--review-button:#b84c2e;--review-on:#fff;--focus:#347d79;--preview:#e4e9e7;--preview-ink:#425354;--pill:#e3e8e4}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--paper:#151d22;--ink:#edf0ec;--muted:#b2c0c4;--rule:#46555b;--control:#819497;--quiz:#e5c77c;--quiz-button:#e5c77c;--quiz-on:#292315;--review:#eead8b;--review-button:#eead8b;--review-on:#2c211b;--focus:#82b9b2;--preview:#243237;--preview-ink:#c0d2d1;--pill:#344348}}
body:has(#theme-light:checked){color-scheme:light;--paper:#f2f3ef;--ink:#253037;--muted:#55636a;--rule:#c7cfce;--control:#718087;--quiz:#81601b;--quiz-button:#ebce83;--quiz-on:#292315;--review:#a5482b;--review-button:#b84c2e;--review-on:#fff;--focus:#347d79;--preview:#e4e9e7;--preview-ink:#425354;--pill:#e3e8e4}
body:has(#theme-dark:checked){color-scheme:dark;--paper:#151d22;--ink:#edf0ec;--muted:#b2c0c4;--rule:#46555b;--control:#819497;--quiz:#e5c77c;--quiz-button:#e5c77c;--quiz-on:#292315;--review:#eead8b;--review-button:#eead8b;--review-on:#2c211b;--focus:#82b9b2;--preview:#243237;--preview-ink:#c0d2d1;--pill:#344348}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Noto Sans JP",-apple-system,BlinkMacSystemFont,"Segoe UI","Yu Gothic UI",Meiryo,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit}svg{flex:none}.preview-bar{min-height:44px;padding:6px 28px;display:flex;align-items:center;justify-content:center;gap:30px;background:var(--preview);color:var(--preview-ink);font-size:12px}.preview-state{display:flex;gap:10px;align-items:center}.preview-state strong{font-weight:500;padding-left:10px;border-left:1px solid var(--control)}.theme-control{border:0;display:flex;gap:3px;padding:0;margin:0;min-width:0;align-items:center}.theme-control legend{float:left;padding:0 8px 0 0;font-size:12px}.theme-control label{position:relative;min-height:30px;display:flex;align-items:center;padding:4px 9px;border-radius:4px;cursor:pointer;white-space:nowrap}.theme-control label:has(:checked){background:var(--paper);color:var(--ink);box-shadow:0 0 0 1px var(--control)}.theme-control label:has(:focus-visible){outline:2px solid var(--focus);outline-offset:2px}.theme-control input{appearance:none;position:absolute;inset:0;width:100%;height:100%;margin:0;cursor:pointer}.page{max-width:1120px;margin:0 auto;padding:0 40px}.site-header{min-height:132px;display:flex;gap:24px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--rule)}h1{margin:0;font-size:34px;line-height:1.2;font-weight:750;letter-spacing:-1.1px}h1 a{text-decoration:none;display:flex;align-items:center}h1 span:not(.brand-dot){font-weight:440;margin-left:5px}.brand-dot{margin-left:8px;align-self:flex-end;width:5px;height:5px;border-radius:1px;background:var(--focus);margin-bottom:6px}.site-header p{font-size:14px;color:var(--muted);margin:0;line-height:1.6}.apps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));padding:30px 0 33px;gap:0}.app{--app-accent:var(--quiz);--app-button:var(--quiz-button);--app-on:var(--quiz-on);display:flex;flex-direction:column;min-width:0;text-decoration:none;position:relative;padding:39px 36px 20px 0;border-top:3px solid var(--app-accent)}.app-review{--app-accent:var(--review);--app-button:var(--review-button);--app-on:var(--review-on);border-left:1px solid var(--rule);padding-left:36px;padding-right:0}.app-heading{display:flex;align-items:center;gap:14px;margin-bottom:24px}.app-icon{color:var(--app-accent)}h2{margin:0;font-size:30px;line-height:1.3;font-weight:700;letter-spacing:-.6px}.app-summary{font-size:18px;font-weight:650;line-height:1.65;margin:0 0 12px;letter-spacing:.01em}.app-description{font-size:15px;line-height:1.9;color:var(--muted);margin:0 0 21px}.app-features{display:flex;flex-wrap:wrap;column-gap:17px;row-gap:7px;list-style:none;padding:0;margin:0 0 27px;font-size:13px;color:var(--muted)}.app-features li::before{content:'·';margin-right:6px;color:var(--app-accent);font-weight:750}.app-link{display:flex;flex-direction:column;align-items:flex-start;gap:9px;margin-top:auto}.app-link>span{display:flex;align-items:center;justify-content:space-between;gap:28px;background:var(--app-button);color:var(--app-on);border-radius:6px;min-height:46px;padding:10px 17px;font-weight:650;font-size:15px;transition:filter .15s}.app-link small{font-size:12px;color:var(--muted);padding-left:1px;letter-spacing:.02em}.creator-links{display:grid;grid-template-columns:145px 1fr;align-items:start;gap:20px;border-top:1px solid var(--rule);padding:26px 0 30px}.creator-links h2{font-size:15px;font-weight:650;letter-spacing:0;padding-top:7px;line-height:1.6}.channels{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px}.channel{display:flex;flex-direction:column;gap:5px;text-decoration:none;align-items:flex-start;min-height:53px;padding:5px 0}.channel-name{display:flex;gap:20px;align-items:center;font-size:17px;font-weight:650;line-height:1.4;letter-spacing:-.2px}.diagonal-arrow{font-size:16px;font-weight:400;color:var(--muted)}.channel-caption{font-size:13px;color:var(--muted);line-height:1.6}.unset{cursor:default}.unset-label{display:inline-block;color:var(--muted);font-size:10px;line-height:1.5;padding:0 4px;background:var(--pill);border-radius:2px;font-weight:400;white-space:nowrap;vertical-align:middle;margin-left:6px}.channel>.unset-label{margin-left:0;margin-top:0}footer{border-top:1px solid var(--rule);font-size:13px;line-height:1.7;color:var(--muted);padding:21px 0 27px}.support{display:flex;align-items:center;gap:24px;flex-wrap:wrap;min-height:30px}.footer-label{font-size:12px;margin-right:2px}.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:12px;font-size:12px}.footer-bottom p{margin:0}a:focus-visible{outline:2px solid var(--focus);outline-offset:6px}a.app:focus-visible{outline-offset:5px}.app-link svg{transition:transform .15s}
@media(hover:hover){a.app:hover .app-link>span{filter:brightness(1.07)}a.app:hover .app-link svg{transform:translateX(3px)}a.channel:hover .channel-name{text-decoration:underline;text-underline-offset:4px}h1 a:hover{color:var(--focus)}}
@media(max-width:900px){.page{padding:0 28px}.site-header{min-height:116px}h1{font-size:31px}.app{padding-right:24px}.app-review{padding-left:24px;padding-right:0}h2{font-size:26px}.app-heading{gap:10px}.app-icon{width:32px;height:32px}.app-summary{font-size:17px}.app-description{font-size:14px}.app-description br{display:none}.app-features{display:block;margin-bottom:22px}.app-features li+li{margin-top:4px}.creator-links{grid-template-columns:110px 1fr;gap:16px}.channels{gap:16px}.channel-caption{font-size:12px}}
@media(max-width:620px){.preview-bar{padding:9px 18px;flex-direction:column;gap:9px;font-size:11px}.preview-state{gap:8px}.theme-control label{min-height:30px;font-size:11px}.theme-control legend{font-size:11px}.page{padding:0 22px}.site-header{min-height:108px;align-items:flex-start;justify-content:center;flex-direction:column;gap:9px}h1{font-size:29px}.site-header p{font-size:12px}.apps{grid-template-columns:1fr;padding:21px 0 0}.app{padding:24px 0 25px}.app-review{border-left:0}.app-heading{margin-bottom:15px;gap:11px}.app-icon{width:32px;height:32px}h2{font-size:27px}.app-summary{font-size:17px;margin-bottom:9px}.app-description{font-size:14px;line-height:1.8;margin-bottom:14px}.app-features{display:flex;font-size:12px;gap:5px 13px;margin-bottom:19px}.app-features li+li{margin-top:0}.app-link{flex-direction:row;align-items:center;justify-content:space-between;gap:12px}.app-link>span{font-size:14px;gap:14px;padding:10px 13px;min-height:44px}.app-link small{font-size:10px;letter-spacing:0}.creator-links{padding:22px 0;grid-template-columns:1fr;gap:13px}.creator-links h2{font-size:14px;padding-top:0}.channels{gap:13px}.channel-name{font-size:16px;gap:10px}.channel-caption{font-size:11px}.channel>.unset-label{font-size:9px}.support{gap:11px 18px;font-size:12px}.footer-label{flex-basis:100%;font-size:11px}.footer-bottom{align-items:flex-start;gap:9px;flex-direction:column;font-size:11px}footer{padding-top:17px;padding-bottom:24px}.unset-label{font-size:9px}}
@media(max-width:360px){.page{padding:0 17px}.app-link{align-items:flex-start;flex-direction:column;gap:6px}.channels{column-gap:10px}.channel-caption{font-size:10px}}
/* Concrete operation previews use the cards already used by the applications. */
.site-header{min-height:90px}.apps{padding-top:24px}.app{padding-top:26px}.app-heading{margin-bottom:16px}.app-description{margin-bottom:18px}.app-summary{margin-bottom:8px}
.operation-preview{margin:0 0 22px;padding:13px 15px 12px;border:1px solid var(--rule);border-radius:7px;background:light-dark(#fdfdfa,#1b282f);min-height:278px;display:flex;flex-direction:column}
.preview-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:13px;font-weight:650;margin-bottom:13px}.preview-heading>small{font-size:10px;color:var(--muted);font-weight:400;white-space:nowrap}.quiz-pair{display:flex;justify-content:center;align-items:center;gap:20px}.quiz-choice{width:117px;display:flex;flex-direction:column;gap:7px}.quiz-choice img{display:block;width:100%;height:auto;aspect-ratio:488/680;object-fit:contain;border-radius:5px}.quiz-choice>span{font-size:11px;text-align:center;border:1px solid var(--app-accent);border-radius:4px;color:var(--ink);padding:5px 2px;line-height:1.3}.versus{font-size:12px;color:var(--muted)}.operation-preview figcaption{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:7px;font-size:12px;line-height:1.5;margin-top:auto;padding-top:12px;color:var(--muted)}.operation-preview figcaption>span{color:var(--app-accent)}.operation-preview figcaption>small{font-size:10px}
.review-example{display:grid;grid-template-columns:125px minmax(0,1fr);gap:17px;align-items:center;flex:1}.review-example-card{display:block;width:100%;height:auto;aspect-ratio:488/680;object-fit:contain;border-radius:5px}.review-example-fields{min-width:0}.example-score-heading{display:flex;justify-content:space-between;align-items:center;gap:6px;font-size:12px;font-weight:650}.example-score-heading strong{font-size:31px;letter-spacing:-1px;font-weight:750;line-height:1;color:light-dark(#815c33,#f0dcbb);white-space:nowrap}.example-score-heading strong small{font-size:10px;letter-spacing:0;margin-left:3px;color:var(--muted);font-weight:500}.example-scale{display:flex;justify-content:space-between;margin-top:15px;color:var(--muted);font-size:12px;font-weight:600}.example-slider{height:5px;background:var(--rule);position:relative;border-radius:10px;margin-top:8px}.example-slider>span{display:block;background:var(--focus);width:62.5%;height:100%;border-radius:10px}.example-slider>i{position:absolute;left:62.5%;top:50%;width:10px;height:10px;background:var(--focus);border-radius:50%;transform:translate(-50%,-50%)}.example-comment{border:1px solid var(--control);border-radius:4px;padding:8px 9px;margin-top:17px;min-height:72px;font-size:12px;line-height:1.7;background:light-dark(#f3f6f5,#273640)}.example-comment>span{color:var(--muted);font-size:10px}.example-comment p{margin:3px 0 0}
@media(max-width:900px) and (min-width:621px){.operation-preview{padding:12px 10px;min-height:278px}.quiz-pair{gap:13px}.quiz-choice{width:99px}.review-example{grid-template-columns:93px minmax(0,1fr);gap:11px}.example-score-heading{flex-wrap:wrap}.example-score-heading strong{font-size:28px}.example-comment{font-size:11px;padding:6px 7px}.preview-heading{font-size:12px}}
@media(max-width:620px){.site-header{min-height:96px}.app{padding-top:22px}.app-heading{margin-bottom:14px}.app-description{margin-bottom:16px}.operation-preview{padding:12px 13px;margin-bottom:18px;min-height:265px}.quiz-pair{gap:18px}.quiz-choice{width:105px}.review-example{grid-template-columns:108px minmax(0,1fr);gap:14px}.example-comment{font-size:11px}.operation-preview figcaption{font-size:11px}.preview-heading{font-size:12px}}
@media(max-width:360px){.operation-preview{padding:11px 10px;min-height:253px}.quiz-pair{gap:11px}.quiz-choice{width:97px}.review-example{grid-template-columns:85px minmax(0,1fr);gap:11px}.example-score-heading{font-size:10px}.example-score-heading strong{font-size:27px}.example-comment{padding:6px 7px;min-height:75px}.preview-heading{font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important}}