: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: "JetBrains Mono", ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Code", Menlo, Consolas, monospace;--step-h1: clamp(1.85rem, 1.4rem + 2.1vw, 2.7rem);--step-h2: clamp(1.3rem, 1.12rem + .9vw, 1.55rem);--step-h3: 1.25rem;--step-body: 1.0625rem;--step-small: .8125rem;--measure: 68ch;--gutter: clamp(1.25rem, 5vw, 2.5rem);--shell-wide: 72rem;--shell-note: 48rem;--paper: #f5f8f1;--card: #ffffff;--ink: #2b3a2a;--muted: #64735f;--line: #dde7d4;--leaf: #35714a;--pine: #29583b;--moss: #e9f1e0;--cream: #f8f4e7;--radius-card: 24px;--radius-hero: 28px;--radius-img: 16px;--shadow-lift: 0 16px 44px rgba(53, 113, 74, .1);--shadow-leafy: 0 8px 26px rgba(53, 113, 74, .12)}*,*: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(--moss);color:var(--pine)}a{color:inherit;text-decoration-color:var(--line);text-underline-offset:.18em;text-decoration-thickness:1px}a:hover{text-decoration-color:var(--leaf)}:focus-visible{outline:2px solid var(--leaf);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:100;text-decoration:none}.skip-link:focus{left:1rem;top:1rem}.masthead{position:sticky;top:0;z-index:50;background:#f5f8f1e6;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.masthead-inner{width:min(var(--shell-wide),calc(100% - 2 * var(--gutter)));margin-inline:auto;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.875rem 1.25rem}@media(min-width:48rem){.masthead-inner{padding:1rem 1.5rem}}.brand{display:inline-flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--ink)}.brand-badge{flex:none;width:44px;height:44px;border-radius:999px;background:var(--moss);box-shadow:0 0 0 1px var(--line);display:inline-flex;align-items:center;justify-content:center;font-family:var(--font-display);font-weight:600;color:var(--leaf);font-size:1.15rem}.brand-text{display:flex;flex-direction:column;gap:.1rem}.wordmark{display:inline-flex;align-items:baseline;gap:.4rem;font-family:var(--font-display);font-weight:600;color:var(--ink);line-height:1.1;letter-spacing:-.01em}.wordmark-zh{font-size:.75em;color:var(--leaf);font-weight:500}.brand-subtitle{font-size:var(--step-small);color:var(--muted);line-height:1.3}@media(max-width:48rem){.brand-subtitle{display:none}}@media(max-width:24rem){.wordmark-zh{display:none}.wordmark{font-size:.92em}}.masthead-nav{display:inline-flex;align-items:center;gap:.35rem}.nav-link{display:inline-flex;align-items:center;min-height:42px;border-radius:999px;padding:0 1rem;font-size:.875rem;font-weight:600;color:var(--ink);text-decoration:none}.nav-link:hover,.nav-link:focus-visible{background:var(--moss);color:var(--pine)}.shell{flex:1;width:min(var(--w, var(--shell-wide)),calc(100% - 2 * var(--gutter)));margin-inline:auto;padding-block:clamp(2rem,6vw,3.5rem) clamp(3rem,8vw,5rem)}.shell-list{--w: var(--shell-wide)}.shell-note{--w: var(--shell-note)}.colophon{width:min(var(--shell-wide),calc(100% - 2 * var(--gutter)));margin-inline:auto;padding:clamp(2.5rem,6vw,3.5rem) 0 clamp(2.5rem,6vw,3.5rem);border-top:1px solid var(--line);text-align:center;display:flex;flex-direction:column;gap:.5rem}.colophon p{margin:0}.colophon-name{font-family:var(--font-display);font-weight:600;color:var(--ink)}.colophon-line{color:var(--muted)}.colophon-fine{font-size:var(--step-small);color:var(--muted)}.note-body{max-width:var(--measure);line-height:1.9}.note-body>*+*{margin-top:1.35rem}.note-body h1,.note-body h2,.note-body h3,.note-body h4{font-family:var(--font-display);font-weight:600;color:var(--ink);line-height:1.2;letter-spacing:-.01em;text-wrap:balance}.note-body h2{font-size:var(--step-h2);margin-top:2.5rem}.note-body h3{font-size:var(--step-h3);margin-top:2rem}.note-body h1,.note-body h4{margin-top:2.5rem}.note-body a{color:var(--leaf);font-weight:600;text-decoration-color:var(--leaf);text-decoration-thickness:1px;text-underline-offset:.18em}.note-body a:hover{color:var(--pine);text-decoration-color:var(--pine)}.note-body strong{color:var(--ink);font-weight:700}.note-body em{color:var(--muted)}.note-body img{border-radius:var(--radius-img);display:block;margin-inline:auto;margin-block:2rem}.note-body ul>li::marker{color:var(--leaf)}.note-body blockquote{margin:1.5rem 0;padding:1rem 1.25rem;background:var(--moss);border-left:3px solid var(--leaf);border-radius:0 16px 16px 0;color:#4c5c47;font-style:italic;font-family:var(--font-display)}.note-body code{font-family:var(--font-mono);font-size:.9em;background:#eef4e8;border:1px solid var(--line);color:#9c4a3c;padding:.15em .4em;border-radius:8px}.note-body pre{font-family:var(--font-mono);font-size:.9em;background:#26382b;color:#eef4ea;border-radius:16px;padding:1.1rem;overflow-x:auto;line-height:1.6}.note-body pre code{background:none;border:none;padding:0;color:inherit;font-size:inherit}.note-body hr{border:none;margin:2.5rem 0;text-align:center}.note-body hr:after{content:"❦";color:#8fae85;font-size:1.25rem}.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;display:block;overflow-x:auto}.note-body th,.note-body td{border:1px solid var(--line);padding:.75rem;text-align:left}.note-body th{background:var(--moss);color:var(--ink);font-weight:700}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;transition-duration:.001ms!important}}