:root{color-scheme:light;--bg:#f7f6f2;--paper:#fffefa;--ink:#282d32;--muted:#777b7c;--line:#e4e3dc;--soft:#eeede6;--accent:#325b68;--accent-soft:#e7eef0;--jp:#355f78;--grammar:#ac4c31;--grammar-bg:#f9eee3;--contrast:#826333;--translation:#4d7867;--shadow:0 16px 48px #292d3210;--reading-size:18px;--reading-line:1.95;--serif:"Iowan Old Style","Baskerville","Noto Serif SC","Songti SC","Yu Mincho",serif;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","Hiragino Sans","Yu Gothic",sans-serif}:root[data-theme=dark]{color-scheme:dark;--bg:#171918;--paper:#202321;--ink:#e4e5dd;--muted:#a0a69e;--line:#383d38;--soft:#292e29;--accent:#acc6ba;--accent-soft:#293d36;--jp:#9cc5d9;--grammar:#ead56f;--grammar-bg:#393629;--contrast:#dca99a;--translation:#92bfab;--shadow:0 16px 48px #0003}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;margin:0;font-size:15px;line-height:1.65}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}button{color:inherit}button,input,select{accent-color:var(--accent)}button svg,a svg{flex-shrink:0}a,button{touch-action:manipulation}button{border:0}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:5px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.4}h1{font-size:36px;font-family:var(--serif);letter-spacing:.02em;font-weight:650}h2{font-size:19px;font-weight:650}button[hidden],[hidden]{display:none!important}main{min-height:65vh}main:focus{outline:none}::selection{background:var(--accent-soft);color:var(--ink)}.page-width{max-width:1080px;margin:auto;padding-inline:32px}.narrow-page{max-width:744px;margin:0 auto;padding:54px 28px 60px}.site-header{background:var(--bg)}.header-inner{justify-content:space-between;align-items:center;gap:24px;max-width:744px;min-height:64px;margin:auto;padding:10px 28px;display:flex}.brand{font-family:var(--sans);letter-spacing:.02em;font-size:17px;font-weight:600}.icon-button{min-width:44px;min-height:44px;color:var(--muted);background:0 0;border-radius:8px;justify-content:center;align-items:center;display:inline-flex}.icon-button:hover{background:var(--soft);color:var(--ink)}.skip-link{z-index:100;background:var(--paper);padding:12px;position:fixed;top:-100px;left:20px}.skip-link:focus{top:10px}.page-intro{margin-bottom:32px}.eyebrow{color:var(--accent);letter-spacing:.15em;margin-bottom:12px;font-size:11px;font-weight:600}.title-dot{color:var(--accent)}.page-description{color:var(--muted);margin-top:10px;font-size:14px;line-height:1.8}.title-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.tiny-dot{background:var(--accent);border-radius:50%;flex-shrink:0;width:5px;height:5px;display:inline-block}.note-list{margin:0;padding:0;list-style:none}.starter-label{color:var(--muted);white-space:nowrap;font-size:10px}.empty-state{text-align:center;color:var(--muted);padding:45px 15px}.empty-state>span{font-family:var(--serif);font-size:22px}.empty-state h2{color:var(--ink);margin:20px 0 8px}.empty-state p{font-size:13px}.article-layout{max-width:800px;padding-top:24px;padding-bottom:64px;display:block}.back-link{color:var(--muted);align-items:center;gap:8px;min-height:44px;font-size:12px;display:inline-flex}.article-header{margin:24px 0}.article-meta{color:var(--muted);align-items:center;gap:12px;margin-bottom:16px;font-size:11px;display:flex}.article-header h1{font-size:36px;line-height:1.6}.article-summary{color:var(--muted);margin-top:13px;font-size:15px;line-height:1.9}.article-submeta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:12px 24px;margin-top:22px;font-size:10px;display:flex}.reading-toolbar{border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);align-items:center;gap:12px;padding-block:10px;font-size:11px;display:flex}.reading-toolbar button{background:0 0;align-items:center;gap:9px;min-height:36px;padding:4px 5px;display:flex}.ruby-symbol{min-width:20px;color:var(--accent);flex-direction:column;align-items:center;font-size:9px;line-height:1.1;display:flex}.ruby-symbol small{font-size:15px}.toolbar-separator{background:var(--line);width:1px;height:17px}.toolbar-settings{justify-content:center;align-items:center;width:40px;height:36px;margin-left:auto;display:flex}.toggle-track{background:var(--accent);border-radius:20px;width:26px;height:15px;padding:2px;display:inline-block}.toggle-track>span{background:var(--paper);border-radius:50%;width:11px;height:11px;display:block;transform:translate(11px)}[data-translations=hide] .toggle-track{background:var(--line)}[data-translations=hide] .toggle-track>span{transform:none}.article-content{font-size:var(--reading-size);line-height:var(--reading-line)}.note-section{margin-top:44px;scroll-margin-top:110px}.note-section>h2{font-size:calc(var(--reading-size)*1.08);border-bottom:1px solid var(--line);align-items:baseline;gap:12px;margin-bottom:22px;padding-bottom:14px;display:flex}.section-number{font:10px var(--sans);color:var(--accent);letter-spacing:.05em;font-weight:500}.prose p{margin:12px 0}.prose p:first-child{margin-top:0}.prose p:last-child{margin-bottom:0}.prose ul,.prose ol{margin:14px 0;padding-left:1.5em}.prose li{margin:9px 0}.prose strong{font-weight:650}.prose a{color:var(--accent);text-underline-offset:4px;text-decoration:underline}.prose code{background:var(--soft);padding:2px 4px;font-size:.85em}.prose pre{background:var(--soft);border-radius:6px;padding:14px;overflow:auto}.rule-box{background:var(--paper);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:2px 8px 8px 2px;margin:18px 0;padding:22px 24px}.rule-label{letter-spacing:.1em;color:var(--muted);font-size:10px}.rule-formula{font-size:calc(var(--reading-size)*1.05);margin-top:9px}.rule-description{border-top:1px dashed var(--line);font-size:calc(var(--reading-size)*.82);color:var(--muted);margin-top:12px;padding-top:12px}.japanese{font-family:"Hiragino Kaku Gothic ProN","Yu Gothic","Noto Sans JP",var(--sans);word-break:normal;overflow-wrap:anywhere;line-height:2.5}.sentence-segment{position:relative}.sentence-part{-webkit-box-decoration-break:clone;box-decoration-break:clone}.japanese ruby{ruby-position:over;ruby-align:center}.japanese rt{letter-spacing:.015em;font-size:.48em;font-weight:400;line-height:1.5}.reading-romaji,[data-reading=romaji] .reading-kana{display:none}[data-reading=romaji] .reading-romaji{display:inline}[data-reading=off] rt{display:none}[data-reading=off] .japanese{line-height:1.9}.emphasis-grammar{color:var(--grammar)}.emphasis-contrast{color:var(--contrast)}.emphasis-muted{color:var(--muted)}.grammar-underline{text-underline-offset:6px;text-decoration:underline 1px dotted}.has-explanation{cursor:pointer;border-bottom:1px dashed var(--accent)}.example-list{margin:25px 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h2{font-size:16px;font-weight:500}.drawer-nav{flex-direction:column;gap:4px;display:flex}.drawer-nav a{min-height:46px;color:var(--muted);align-items:center;gap:13px;padding:9px 0;font-size:14px;display:flex}.drawer-nav a[aria-current=page],.drawer-nav a:hover{color:var(--accent)}.drawer-tags{border-top:1px solid var(--line);margin-top:26px;padding-top:24px}.drawer-tags h3{color:var(--muted);margin-bottom:12px;font-size:12px;font-weight:500}.drawer-tags a{min-height:36px;color:var(--muted);justify-content:space-between;align-items:center;gap:16px;font-size:12px;display:flex}.drawer-tags a:hover{color:var(--accent)}.drawer-tags small{font-size:10px}.drawer-status{border-top:1px solid var(--line);color:var(--muted);margin-top:24px;padding-top:22px;font-size:10px}.article-toc{border-block:1px solid var(--line);background:0 0;margin-top:22px;font-size:12px;display:block}.article-toc summary{cursor:pointer;color:var(--accent);justify-content:space-between;align-items:center;padding:14px 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h1{font-size:30px;line-height:1.6}.article-summary{margin-top:10px;font-size:13px}.article-meta{margin-bottom:12px}.article-submeta{gap:10px;margin-top:18px}.reading-toolbar{padding-block:8px}.article-toc{background:var(--paper);border:1px solid var(--line);border-radius:6px;margin-top:22px;font-size:12px;display:block}.article-toc summary{cursor:pointer;color:var(--accent);justify-content:space-between;align-items:center;padding:14px 17px;list-style:none;display:flex}.article-toc summary::-webkit-details-marker{display:none}.article-toc summary:after{content:"+";margin-left:10px}.article-toc[open] summary:after{content:"−"}.article-toc summary>span{color:var(--muted);margin-left:auto;font-size:10px}.article-toc ol{color:var(--muted);margin:0 18px 16px;padding-left:20px}.article-toc a{min-height:35px;padding:7px 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