:root{--font-display: "Lora", "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "Yu Mincho", ui-serif, Georgia, serif;--font-body: "Be Vietnam Pro", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;--font-mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;--step-hero: clamp(1.6rem, 1.25rem + 1.6vw, 2.3rem);--step-h1: clamp(1.85rem, 1.4rem + 2.1vw, 2.7rem);--step-h2: clamp(1.3rem, 1.12rem + .9vw, 1.6rem);--step-h3: 1.2rem;--step-body: 1.0625rem;--step-small: .8125rem;--measure: 68ch;--gutter: clamp(1.25rem, 5vw, 2.5rem);--shell-list: 720px;--shell-note: 680px;--paper: #faf9f6;--paper-raised: #ffffff;--ink: #1b1a17;--ink-soft: #6c6a62;--ink-faint: #97958b;--rule: #e7e4dc;--rule-soft: #f0eee8;--seal: #b23a2e;--seal-strong: #8e2c22;--accent-wash: rgba(178, 58, 46, .07);--radius: 4px;--tap: 44px}@media(prefers-color-scheme:dark){:root{--paper: #16150f;--paper-raised: #1e1d16;--ink: #e9e6dd;--ink-soft: #a3a096;--ink-faint: #726f66;--rule: #2c2a24;--rule-soft: #211f19;--seal: #e07a6b;--seal-strong: #ec8b7c;--accent-wash: rgba(224, 122, 107, .1)}}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:var(--step-body);line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img{max-width:100%;height:auto}::selection{background:var(--accent-wash);color:var(--seal-strong)}a{color:inherit;text-decoration-color:var(--rule);text-underline-offset:.18em;text-decoration-thickness:1px}a:hover{text-decoration-color:var(--seal)}:focus-visible{outline:2px solid var(--seal);outline-offset:3px;border-radius:2px}:lang(zh),:lang(ja){line-height:1.85;letter-spacing:.01em}.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--paper);padding:.6rem 1rem;z-index:10;text-decoration:none}.skip-link:focus{left:1rem;top:1rem}.masthead,.colophon{width:min(var(--shell-list),calc(100% - 2 * var(--gutter)));margin-inline:auto}.masthead{padding-top:clamp(2.25rem,6vw,4rem);padding-bottom:clamp(1.5rem,4vw,2.5rem)}.wordmark{display:inline-flex;align-items:baseline;gap:.6rem;font-family:var(--font-display);text-decoration:none;color:var(--ink)}.wordmark-en{font-size:var(--step-hero);font-weight:600;letter-spacing:-.01em;line-height:1.05}.wordmark-zh{font-size:.9em;color:var(--seal);font-weight:500}.masthead-tagline{margin:.85rem 0 0;max-width:46ch;color:var(--ink-soft);font-size:1rem;line-height:1.55}.shell{flex:1;width:min(var(--w, var(--shell-list)),calc(100% - 2 * var(--gutter)));margin-inline:auto;padding-bottom:clamp(3rem,8vw,5rem)}.shell-list{--w: var(--shell-list)}.shell-note{--w: var(--shell-note)}.colophon{padding:2rem 0 2.5rem;border-top:1px solid var(--rule);color:var(--ink-faint);font-family:var(--font-mono);font-size:var(--step-small);line-height:1.6;display:flex;flex-wrap:wrap;gap:.35rem 1.25rem}.colophon p{margin:0}.note-body{max-width:var(--measure)}.note-body>*+*{margin-top:1.15em}.note-body h1,.note-body h2,.note-body h3,.note-body h4{font-family:var(--font-display);font-weight:600;line-height:1.2;letter-spacing:-.01em;margin-top:2em;text-wrap:balance}.note-body h2{font-size:var(--step-h2)}.note-body h3{font-size:var(--step-h3)}.note-body a{color:var(--seal);text-decoration-color:var(--accent-wash)}.note-body a:hover{text-decoration-color:var(--seal)}.note-body img{border-radius:var(--radius);display:block}.note-body blockquote{margin:1.5em 0;padding:.2em 0 .2em 1.25rem;border-left:2px solid var(--seal);color:var(--ink-soft);font-style:italic}.note-body code{font-family:var(--font-mono);font-size:.9em;background:var(--rule-soft);padding:.15em .4em;border-radius:3px}.note-body pre{font-family:var(--font-mono);font-size:.9em;background:var(--paper-raised);border:1px solid var(--rule);border-radius:var(--radius);padding:1rem 1.15rem;overflow-x:auto;line-height:1.6}.note-body pre code{background:none;padding:0;font-size:inherit}.note-body hr{border:none;border-top:1px solid var(--rule);margin:2.5em 0}.note-body ul,.note-body ol{padding-left:1.4rem}.note-body li+li{margin-top:.4em}.note-body table{width:100%;border-collapse:collapse;font-size:.95em}.note-body th,.note-body td{border-bottom:1px solid var(--rule);padding:.5rem .75rem;text-align:left}.note-body th{font-weight:600}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;transition-duration:.001ms!important}}