/*! tailwindcss v4.2.1 | MIT License | https://tailwindcss.com */
@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--spacing:.25rem;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before{box-sizing:border-box;border:0 solid;margin:0;padding:0}::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){-webkit-appearance:button;appearance:button}::file-selector-button{-webkit-appearance:button;appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.relative{position:relative}.start{inset-inline-start:var(--spacing)}.table{display:table}.overline{text-decoration-line:overline}}:root{--background:#fff;--text:#171717;--muted:#6b6b6b;--line:#e7e7e7;--soft:#f6f6f6;--content:760px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--background);color:var(--text);text-rendering:optimizelegibility;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}.page-shell{min-height:100vh}.site-header,.site-footer{justify-content:space-between;align-items:center;width:min(100% - 48px,1040px);margin:0 auto;display:flex}.site-header{border-bottom:1px solid var(--line);height:72px}.site-name{font-size:14px;font-weight:650}.site-header nav{color:var(--muted);gap:26px;font-size:13px;display:flex}:is(.site-header a:hover,.site-header a:focus-visible,.site-footer a:hover,.site-footer a:focus-visible){color:#000;text-underline-offset:4px;text-decoration:underline}.home-main{width:min(calc(100% - 48px), var(--content));margin:0 auto;padding:112px 0 120px}.intro{padding-bottom:104px}.overline{color:var(--muted);letter-spacing:.14em;text-transform:uppercase;margin:0 0 20px;font-size:11px}.intro h1{letter-spacing:-.04em;margin:0;font-size:clamp(38px,7vw,58px);font-weight:650;line-height:1.18}.intro>p:last-child{max-width:590px;color:var(--muted);margin:28px 0 0;font-size:16px;line-height:1.9}.note-index h2,.plain-section h2{margin:0 0 22px;font-size:13px;font-weight:650}.note-list{border-top:1px solid var(--text)}.note-link{border-bottom:1px solid var(--line);padding:30px 44px 30px 0;display:block;position:relative}:is(.note-link:hover h3,.note-link:focus-visible h3){text-underline-offset:5px;text-decoration:underline}.note-link:focus-visible{outline:2px solid var(--text);outline-offset:5px}.note-meta,.article-meta{color:var(--muted);gap:14px;font-size:11px;display:flex}.note-link h3{margin:11px 0 8px;font-size:21px;font-weight:600;line-height:1.45}.note-link p{color:var(--muted);margin:0;font-size:13px;line-height:1.7}.note-arrow{color:var(--muted);font-size:18px;position:absolute;top:50%;right:2px;transform:translateY(-50%)}.plain-section{border-top:1px solid var(--line);margin-top:88px;padding-top:28px}.plain-section p{max-width:620px;color:var(--muted);margin:0;font-size:14px;line-height:1.9}.article-main{width:min(calc(100% - 48px), var(--content));margin:0 auto;padding:64px 0 120px}.back-link{color:var(--muted);margin-bottom:76px;font-size:12px;display:inline-block}:is(.back-link:hover,.back-link:focus-visible){color:var(--text);text-underline-offset:4px;text-decoration:underline}.article-header{border-bottom:1px solid var(--line);padding-bottom:52px}.article-header h1{letter-spacing:-.035em;margin:18px 0 24px;font-size:clamp(34px,6vw,50px);font-weight:650;line-height:1.25}.article-header>p{max-width:680px;color:var(--muted);margin:0;font-family:Songti SC,SimSun,serif;font-size:18px;line-height:1.9}.article-body{padding-top:30px;font-family:Songti SC,SimSun,serif;font-size:16px;line-height:2}.article-body h2{letter-spacing:-.01em;margin:58px 0 16px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:22px;font-weight:650}.article-body p{margin:0 0 22px}.article-body ol,.article-body ul{margin:0 0 24px;padding-left:1.45em}.article-body li{margin:8px 0;padding-left:.25em}.article-body blockquote{border-left:2px solid var(--text);color:var(--muted);margin:34px 0;padding:2px 0 2px 22px;font-size:18px}.equation{background:var(--soft);text-align:center;white-space:nowrap;margin:28px 0 14px;padding:22px 24px;font-family:Georgia,Times New Roman,serif;font-size:clamp(18px,3vw,23px);line-height:1.5;overflow-x:auto}.equation-note{color:var(--muted);text-align:center;font-size:14px}.site-footer{border-top:1px solid var(--line);min-height:90px;color:var(--muted);font-size:11px}@media (max-width:640px){.site-header,.site-footer,.home-main,.article-main{width:min(calc(100% - 36px), var(--content))}.site-header{height:64px}.site-header nav{gap:18px}.home-main{padding-top:80px;padding-bottom:90px}.intro{padding-bottom:76px}.note-link{padding-top:25px;padding-bottom:25px}.note-link h3{font-size:18px}.article-main{padding-top:42px;padding-bottom:90px}.back-link{margin-bottom:50px}.article-header{padding-bottom:38px}.article-header>p,.article-body{font-size:15px}.site-footer{flex-direction:column;justify-content:center;align-items:flex-start;gap:8px;min-height:110px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}