@import"https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400..800&display=swap";:root{--font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", sans-serif;--font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", sans-serif;--font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;--font-brand: clamp(18px, 2.4vw, 26px);--weight-normal: 500;--weight-semibold: 600;--weight-bold: 700;--text-body: 18px;--text-heading-1: 30px;--text-heading-2: 24px;--text-heading-3: 20px;--text-title-article: clamp(34px, 4.8vw, 42px);--text-title-page: clamp(28px, 4vw, 42px);--text-title-card: clamp(18px, 1.7vw, 22px);--text-summary: 16px;--text-intro: 14px;--text-meta: 13px;--text-caption: 12px;--leading-body: 1.82;--leading-heading: 1.45;--leading-title: 1.28;--leading-text: 1.7;--leading-summary: 1.62;--leading-meta: 1.4;--color-bg: #f7f6f2;--color-surface: #fbfaf7;--color-surface-white: #ffffff;--color-text: rgba(48, 48, 46, .94);--color-text-heading: rgba(20, 20, 19, .99);--color-text-secondary: rgba(94, 93, 89, .82);--color-text-tertiary: rgba(94, 93, 89, .58);--color-text-inverse: rgba(248, 245, 237, .96);--color-border: rgba(94, 93, 89, .14);--color-border-strong: rgba(94, 93, 89, .22);--color-interactive: rgba(20, 20, 19, .98);--color-hover: rgba(94, 93, 89, .055);--color-pressed: rgba(94, 93, 89, .09);--color-code: rgba(94, 93, 89, .08);--color-code-block: #181922;--color-code-block-text: #f6f3ea;--color-link: #8f4a38;--color-link-hover: #6f3528;--color-link-underline: rgba(143, 74, 56, .28);--color-link-underline-hover: rgba(111, 53, 40, .56);--shadow-float: 0 8px 24px rgba(29, 31, 42, .06);--shadow-float-soft: 0 6px 18px rgba(29, 31, 42, .045);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 10px;--radius-xl: 12px;--width-content: 980px;--width-content-narrow: 760px;--width-article: 860px;--width-toc: 260px;--space-4: 4px;--space-8: 8px;--space-12: 12px;--space-16: 16px;--space-20: 20px;--space-24: 24px;--space-28: 28px;--space-32: 32px;--space-40: 40px;--space-48: 48px;--space-56: 56px;--space-64: 64px;--space-72: 72px;--space-120: 120px;--size-cover-square: 144px;--size-cover-square-md: 128px;--divider-subtle: 1px solid var(--color-border);--divider-strong: 1px solid var(--color-border-strong);--transition-interactive: background-color .2s ease, color .2s ease, border-color .2s ease, transform .2s ease, box-shadow .2s ease;--translate-interactive-y: -.5px;--opacity-timeline-dot: .18;--opacity-timeline-dot-active: .52}html,body{margin:0;width:100%;min-height:100%}body{font-family:var(--font-body);background:var(--color-bg);color:var(--color-text);letter-spacing:.04em}.site-header{display:flex;align-items:center;justify-content:space-between;position:fixed;top:0;left:0;right:0;z-index:50;box-sizing:border-box;min-height:var(--space-56);padding:12px var(--space-56);background:color-mix(in srgb,var(--color-bg) 72%,transparent);border-bottom:1px solid transparent;box-shadow:none!important;transform:translateY(0);transition:transform .24s ease,box-shadow .2s ease;backdrop-filter:blur(16px) saturate(120%);-webkit-backdrop-filter:blur(16px) saturate(120%)}.site-header.is-hidden{transform:translateY(-100%)}.site-header.is-elevated{background:color-mix(in srgb,var(--color-bg) 86%,transparent);border-bottom-color:var(--color-border);box-shadow:var(--shadow-float)!important}.brand{font-family:var(--font-heading);font-size:var(--font-brand);letter-spacing:0;color:var(--color-text-heading);font-weight:var(--weight-semibold)}.brand-link{text-decoration:none;border-bottom:0;padding-bottom:var(--space-4)}.brand-link:hover,.brand-link:focus-visible{opacity:.88}.site-nav{display:flex;gap:var(--space-20);justify-content:flex-end}.site-nav a{text-decoration:none;color:var(--color-text);border-bottom:1px solid transparent;padding-bottom:var(--space-4)}.site-nav a:hover{border-bottom-color:var(--color-text-secondary)}.site-nav a.is-active{border-bottom-color:var(--color-interactive)}.site-header:hover,.site-header:focus-within{background:color-mix(in srgb,var(--color-bg) 92%,transparent)}.site-main{display:grid;justify-items:center;padding:72px var(--space-24) 96px}.site-footer{text-align:center;padding:0 var(--space-24) var(--space-48)}.site-footer p{font-size:var(--text-meta);color:var(--color-text-tertiary);margin:0}.footer-links{display:flex;justify-content:center;gap:var(--space-16);margin-top:var(--space-16)}.footer-links a{color:var(--color-text-tertiary);transition:color .2s ease;display:flex;align-items:center}.footer-links a:hover{color:var(--color-text)}.wechat-qr-wrap{position:relative;display:flex;align-items:center;cursor:pointer;color:var(--color-text-tertiary);transition:color .2s ease}.wechat-qr-wrap:hover{color:var(--color-text)}.wechat-qr{position:absolute;bottom:var(--space-32);left:50%;transform:translate(-50%);border-radius:var(--radius-md);box-shadow:var(--shadow-float);opacity:0;pointer-events:none;transition:opacity .2s ease}.wechat-qr-wrap:hover .wechat-qr{opacity:1}@media(max-width:720px){.site-header{flex-direction:column;align-items:flex-start;gap:var(--space-16);padding:var(--space-16) var(--space-24)}.site-nav{flex-wrap:wrap;justify-content:flex-start}.site-main{padding-top:136px}}