:root{color-scheme:light;--brand-deep:#0b1c18;--brand-mint:#2fd9a8;--brand-ink:#14312a;--brand-body:#2c332f;--brand-muted:#4a544f;--brand-primary:#0f5c4a;--brand-brick:#b4552a;--brand-highlight:#ffe08a;--brand-divider:#e6e8e6;--bg:#faf8f2;--bg-soft:#f4f0e6;--surface:#fffdf8;--surface-strong:#fff;--border:#14312a1a;--border-strong:#14312a2e;--text-strong:var(--brand-ink);--text:var(--brand-body);--text-muted:var(--brand-muted);--accent:var(--brand-primary);--accent-quiet:#0f5c4a14;--label:var(--brand-brick);--highlight-bar:var(--brand-highlight);--on-dark:#eef3f0;--on-dark-muted:#a9b8b1;--s-1:.25rem;--s-2:.5rem;--s-3:.75rem;--s-4:1rem;--s-5:1.5rem;--s-6:2rem;--s-7:3rem;--s-8:4rem;--s-9:6rem;--s-10:8rem;--r-sm:.5rem;--r-md:.875rem;--r-lg:1.375rem;--r-full:999px;--sh-1:0 1px 2px #14312a0d;--sh-2:0 6px 16px -6px #14312a1f, 0 2px 4px #14312a0a;--sh-3:0 24px 48px -20px #14312a3d, 0 6px 14px -8px #14312a1a;--font-sans:-apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;--font-display:"Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", "Noto Serif CJK SC", "SimSun", Georgia, serif;--font-mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--fs-display:clamp(2.5rem, 5.4vw, 4.5rem);--fs-h1:clamp(2.25rem, 4.5vw, 3.5rem);--fs-h2:clamp(1.75rem, 3vw, 2.5rem);--fs-h3:clamp(1.25rem, 1.7vw, 1.625rem);--fs-lede:clamp(1rem, 1.2vw, 1.1875rem);--fs-body:.9375rem;--fs-small:.8125rem;--fs-label:.6875rem;--page-max:72.5rem;--reading-max:45rem;--ease:cubic-bezier(.22, .61, .36, 1)}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;--bg:#0c1512;--bg-soft:#101c18;--surface:#14211d;--surface-strong:#182823;--border:#e9f5f01a;--border-strong:#e9f5f033;--text-strong:#eaf2ee;--text:#c6d2cc;--text-muted:#8fa099;--accent:#4fd0aa;--accent-quiet:#4fd0aa1f;--label:#e09468;--highlight-bar:#ffe08a42;--sh-1:0 1px 2px #0006;--sh-2:0 6px 16px -6px #00000080;--sh-3:0 24px 48px -20px #0009}}:root[data-theme=dark]{color-scheme:dark;--bg:#0c1512;--bg-soft:#101c18;--surface:#14211d;--surface-strong:#182823;--border:#e9f5f01a;--border-strong:#e9f5f033;--text-strong:#eaf2ee;--text:#c6d2cc;--text-muted:#8fa099;--accent:#4fd0aa;--accent-quiet:#4fd0aa1f;--label:#e09468;--highlight-bar:#ffe08a42;--sh-1:0 1px 2px #0006;--sh-2:0 6px 16px -6px #00000080;--sh-3:0 24px 48px -20px #0009}*,:before,:after{box-sizing:border-box}html{background:var(--bg);scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{min-height:100vh;color:var(--text);background:var(--bg);font-family:var(--font-sans);font-size:var(--fs-body);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;flex-direction:column;margin:0;line-height:1.75;display:flex}body.menu-open{overflow:hidden}::selection{color:var(--brand-ink);background:var(--brand-highlight)}a{color:var(--label);text-underline-offset:.2em;text-decoration-thickness:.08em}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}img,picture,svg{max-width:100%;display:block}img{height:auto}h1,h2,h3,p,figure,blockquote{margin:0}h1,h2,h3{color:var(--text-strong);font-family:var(--font-display);letter-spacing:.005em;font-weight:700}.site-main{flex:1}.shell{width:min(var(--page-max), calc(100% - var(--s-5)));margin-inline:auto}.reading-shell{width:min(var(--reading-max), calc(100% - var(--s-5)));margin-inline:auto}:where(a,button,input,textarea,select,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}.skip-link{left:var(--s-4);z-index:100;padding:var(--s-3) var(--s-5);color:#fff;background:var(--brand-primary);border-radius:var(--r-sm);transition:top .2s var(--ease);font-weight:600;text-decoration:none;position:fixed;top:-5rem}.skip-link:focus{top:var(--s-4)}.kicker{align-items:center;gap:var(--s-3);color:var(--label);font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.14em;text-transform:uppercase;font-weight:700;display:inline-flex}.kicker:before{border-radius:var(--r-full);content:"";background:currentColor;width:1.375rem;height:1.5px}.kicker.zh{font-family:var(--font-sans);letter-spacing:.06em;text-transform:none;font-size:.75rem}.highlight{z-index:0;display:inline-block;position:relative}.highlight:after{z-index:-1;background:var(--highlight-bar);content:"";border-radius:3px;height:.2em;position:absolute;bottom:.1em;left:-.04em;right:-.04em}:root[data-theme=dark] .highlight:after{border-radius:var(--r-full);background:#ffe08ad1;height:4px;bottom:.02em}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .highlight:after{border-radius:var(--r-full);background:#ffe08ad1;height:4px;bottom:.02em}}mark{color:var(--brand-ink);background:var(--brand-highlight);border-radius:.2em;padding:.05em .25em}.btn{justify-content:center;align-items:center;gap:var(--s-2);min-height:44px;padding:0 var(--s-5);border-radius:var(--r-full);letter-spacing:.01em;cursor:pointer;transition:transform .2s var(--ease), box-shadow .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);border:1px solid #0000;font-size:.875rem;font-weight:650;text-decoration:none;display:inline-flex}.btn-primary{color:#fff;background:var(--brand-primary);box-shadow:var(--sh-2)}.btn-secondary{color:var(--text-strong);background:var(--surface);border-color:var(--border-strong)}.btn-sm{min-height:44px;padding-inline:var(--s-4);font-size:var(--fs-small)}.text-link{align-items:center;gap:var(--s-2);min-height:44px;color:var(--label);font-weight:650;display:inline-flex}.text-link svg{stroke:currentColor;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px;width:1rem;height:1rem;transition:transform .2s var(--ease)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--sh-1);transition:transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease)}.card-pad{padding:var(--s-5)}.card:focus-within{outline:2px solid var(--accent);outline-offset:3px}.quote,.prose blockquote{padding:var(--s-4) var(--s-5);color:var(--text-muted);background:var(--accent-quiet);border-left:4px solid var(--brand-primary);border-radius:0 var(--r-md) var(--r-md) 0;font-family:var(--font-display);font-size:1.05rem;line-height:1.8}.prose{color:var(--text);font-size:1rem;line-height:1.9}.prose>*+*{margin-top:var(--s-5)}.prose h2{margin-top:var(--s-8);font-size:var(--fs-h2);line-height:1.35}.prose h3{margin-top:var(--s-7);font-size:var(--fs-h3);line-height:1.45}.prose a{color:var(--label);font-weight:600}.prose hr{margin-block:var(--s-8);border:0;border-top:1px solid var(--brand-divider)}.site-header{z-index:50;background:var(--bg);border-top:3px solid var(--brand-mint);transition:border-color .2s var(--ease), box-shadow .2s var(--ease);border-bottom:1px solid #0000;position:sticky;top:0}body.is-scrolled .site-header{border-bottom-color:var(--border);box-shadow:var(--sh-1)}.header-inner{justify-content:space-between;align-items:center;gap:var(--s-4);min-height:73px;display:flex}.brand{align-items:center;gap:var(--s-3);color:var(--text-strong);text-decoration:none;display:inline-flex}.brand-mark{border-radius:var(--r-sm);flex:none;width:44px;height:44px}.brand-copy{gap:2px;display:grid}.brand-name{letter-spacing:.01em;font-size:1rem;font-weight:700;line-height:1.2}.brand-sub{color:var(--text-muted);font-family:var(--font-mono);letter-spacing:.14em;font-size:.5625rem;font-weight:600;line-height:1}.header-actions{align-items:center;gap:var(--s-2);display:flex}.site-nav{left:var(--s-3);right:var(--s-3);z-index:60;padding:var(--s-2);background:var(--surface-strong);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--sh-3);opacity:0;visibility:hidden;transition:opacity .2s var(--ease), transform .2s var(--ease);flex-direction:column;align-items:stretch;gap:0;display:flex;position:fixed;top:4.875rem;transform:translateY(-8px)}body.menu-open .site-nav{opacity:1;visibility:visible;transform:translateY(0)}.site-nav a{min-height:46px;padding:var(--s-2) var(--s-4);color:var(--text);border-radius:var(--r-sm);align-items:center;font-size:.9375rem;font-weight:550;text-decoration:none;display:flex}.site-nav a[aria-current=page]{color:var(--text-strong);background:var(--accent-quiet)}.site-nav .nav-cta{margin-top:var(--s-2);color:#fff;background:var(--brand-primary);justify-content:center;font-weight:650}.icon-btn{width:44px;height:44px;color:var(--text);border:1px solid var(--border);border-radius:var(--r-sm);cursor:pointer;transition:background-color .2s var(--ease), border-color .2s var(--ease);background:0 0;place-items:center;padding:0;display:grid}.icon-btn svg{stroke:currentColor;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7px;width:18px;height:18px}.icon-sun{display:none}:root[data-theme=dark] .icon-sun{display:block}:root[data-theme=dark] .icon-moon{display:none}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .icon-sun{display:block}:root:not([data-theme=light]) .icon-moon{display:none}}.header-cta{display:none}.site-footer{margin-top:var(--s-8);border-top:1px solid var(--border)}.footer-inner{gap:var(--s-5);padding-block:var(--s-7);display:grid}.footer-brand{align-items:center;gap:var(--s-3);color:var(--text-muted);font-size:var(--fs-small);display:flex}.footer-brand img{border-radius:var(--r-sm);width:44px;height:44px}.footer-links{gap:var(--s-3) var(--s-5);flex-wrap:wrap;display:flex}.footer-links a{min-width:44px;min-height:44px;color:var(--text-muted);font-size:var(--fs-small);justify-content:center;align-items:center;text-decoration:none;display:inline-flex}.footer-sign{color:var(--text-strong);font-family:var(--font-display);font-size:1rem;font-weight:700}@media (hover:hover){.btn-primary:hover{box-shadow:var(--sh-3);background:#0c4c3d;transform:translateY(-1px)}.btn-secondary:hover{background:var(--surface-strong);box-shadow:var(--sh-2);transform:translateY(-1px)}.text-link:hover svg{transform:translate(3px)}.card:hover{border-color:var(--border-strong);box-shadow:var(--sh-2);transform:translateY(-3px)}.site-nav a:hover,.icon-btn:hover{background:var(--accent-quiet)}.footer-links a:hover{color:var(--accent)}}@media (width>=48rem){body.menu-open{overflow:visible}.shell,.reading-shell{width:min(var(--page-max), calc(100% - var(--s-8)))}.reading-shell{max-width:var(--reading-max)}.site-nav{align-items:center;gap:var(--s-1);box-shadow:none;opacity:1;visibility:visible;background:0 0;border:0;border-radius:0;flex-direction:row;padding:0;display:flex;position:static;transform:none}.site-nav a{min-height:44px;padding:var(--s-2) var(--s-3);font-size:.875rem;position:relative}.site-nav a:after{left:var(--s-3);right:var(--s-3);background:var(--accent);border-radius:var(--r-full);content:"";transform-origin:0;height:1.5px;transition:transform .2s var(--ease);position:absolute;bottom:4px;transform:scaleX(0)}.site-nav a:hover:after,.site-nav a[aria-current=page]:after{transform:scaleX(1)}.site-nav a[aria-current=page],.site-nav a:hover{background:0 0}.site-nav .nav-cta,.nav-toggle{display:none}.header-cta{display:inline-flex}.footer-inner{grid-template-columns:1fr auto;align-items:center}.footer-sign{grid-column:1/-1}}@media (width>=64rem){.footer-inner{justify-content:space-between;align-items:center;display:flex}.footer-sign{grid-column:auto}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.btn:hover,.card:hover,.text-link:hover svg{transform:none}}