:root{--bg: #fafaf8;--bg-surface: #fff;--bg-code: #f5f5f0;--text: #1a1a1a;--text-secondary: #444;--text-tertiary: #666;--text-muted: #767676;--border: #e8e8e4;--border-light: #eee;--border-rule: #ddd;--border-accent: #ccc;--shadow-card: 0 2px 12px rgba(0, 0, 0, .04);--space-page: clamp(24px, 5vw, 48px);--space-hero-top: clamp(56px, 8vw, 104px);--space-section: clamp(48px, 6vw, 72px);--space-prose-top: clamp(32px, 5vw, 48px)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:Georgia,Times New Roman,serif;font-size:93.75%;line-height:1.8;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;scroll-behavior:smooth}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}body{min-height:100vh;display:flex;flex-direction:column}a{color:var(--text);text-decoration:underline;text-underline-offset:2px;transition:color .2s}a:hover{color:var(--text-secondary)}:focus-visible{outline:2px solid var(--text);outline-offset:2px}.skip-link{position:absolute;left:-9999px;top:0;z-index:100;padding:8px 16px;background:var(--text);color:var(--bg);font-family:system-ui,-apple-system,sans-serif;font-size:13px;text-decoration:none}.skip-link:focus{left:8px;top:8px}.nav{display:flex;justify-content:space-between;align-items:center;padding:24px var(--space-page);border-bottom:1px solid var(--border);position:relative}.nav-wordmark{font-family:system-ui,-apple-system,sans-serif;font-size:13px;letter-spacing:.15em;color:var(--text-muted);text-decoration:none;transition:color .2s}.nav-links{display:flex;gap:24px;font-family:system-ui,-apple-system,sans-serif;font-size:13px;list-style:none}.nav-links a{color:var(--text-tertiary);text-decoration:none;transition:color .2s;padding-bottom:2px;border-bottom:1px solid transparent}.nav-links a:hover{color:var(--text);border-bottom-color:var(--border-accent)}.nav-links a.active{color:var(--text);font-weight:500;border-bottom-color:var(--text)}.footer{margin-top:auto;padding:24px var(--space-page);border-top:1px solid var(--border);display:flex;justify-content:space-between;font-family:system-ui,-apple-system,sans-serif;font-size:12px;color:var(--text-muted)}.footer a{color:var(--text-muted);text-decoration:none;transition:color .2s}.footer a:hover{color:var(--text-tertiary)}.hero{padding:var(--space-hero-top) var(--space-page) var(--space-section);max-width:648px}.hero h1{font-size:clamp(24px,2vw + 18px,36px);font-weight:400;line-height:1.25;letter-spacing:-.01em;margin-bottom:20px}.hero p{color:var(--text-tertiary);font-size:16px;line-height:1.7}.hero-rule{width:40px;height:2px;background:var(--text);margin-top:32px;border:none}.cards{display:flex;gap:32px;padding:0 var(--space-page) var(--space-hero-top)}.card{flex:1;border:1px solid var(--border);padding:32px;background:var(--bg-surface);text-decoration:none;color:inherit;transition:border-color .2s,box-shadow .2s,transform .2s}.card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-card);transform:translateY(-1px)}.card-label{font-family:system-ui,-apple-system,sans-serif;font-size:12px;letter-spacing:.15em;color:var(--text-muted);text-transform:uppercase;margin-bottom:12px}.card h2{font-size:20px;font-weight:400;line-height:1.3;margin-bottom:8px}.card p{font-size:14px;color:var(--text-tertiary);line-height:1.6;margin-bottom:16px}.card-link{font-family:system-ui,-apple-system,sans-serif;font-size:13px;color:var(--text);text-decoration:underline}.prose{max-width:680px;padding:var(--space-prose-top) var(--space-page) var(--space-hero-top)}.prose-centered{margin:0 auto}.prose-title{font-size:clamp(24px,2vw + 18px,36px);font-weight:400;line-height:1.25;letter-spacing:-.01em;margin-bottom:8px}.prose-subtitle{font-size:16px;color:var(--text-tertiary);line-height:1.5;margin-bottom:16px}.prose-meta{font-family:system-ui,-apple-system,sans-serif;font-size:12px;color:var(--text-muted)}.prose-rule{width:40px;height:2px;background:var(--text);margin:24px 0 48px;border:none}.prose h2{font-size:24px;font-weight:500;line-height:1.3;margin:var(--space-section) 0 8px}.prose h2+hr{width:24px;height:1px;background:var(--border-accent);margin-bottom:24px;border:none}.prose h3{font-size:18px;font-weight:500;line-height:1.3;margin:32px 0 12px}.prose p{color:var(--text-secondary);margin-bottom:16px}.prose ul,.prose ol{color:var(--text-secondary);margin-bottom:16px;padding-left:24px}.prose li{margin-bottom:4px}.prose strong{font-weight:600;color:var(--text)}.prose em{font-style:italic}.prose blockquote{border-left:3px solid var(--border-rule);padding-left:20px;margin:16px 0;color:var(--text-tertiary);font-style:italic}.prose table{width:100%;border-collapse:collapse;font-family:system-ui,-apple-system,sans-serif;font-size:13px;font-variant-numeric:tabular-nums;margin:16px 0 24px;display:block;overflow-x:auto}.prose thead tr{border-bottom:2px solid var(--border-rule)}.prose th{text-align:left;padding:8px 12px;color:var(--text-tertiary);font-weight:500}.prose td{padding:8px 12px;color:var(--text-secondary);border-bottom:1px solid var(--border-light)}.prose .katex-display{background:var(--bg-code);border-left:3px solid var(--border-rule);padding:20px 24px;margin:16px 0 24px;overflow-x:auto}.page-with-sidebar{display:flex}.page-with-sidebar .prose{flex:1;min-width:0}.toc-sidebar{width:220px;min-width:220px;padding:var(--space-prose-top) 24px var(--space-prose-top) var(--space-page);border-right:1px solid var(--border);position:sticky;top:0;height:100vh;overflow-y:auto;font-family:system-ui,-apple-system,sans-serif;font-size:12px;line-height:2.2}.toc-label{font-size:11px;letter-spacing:.15em;color:var(--text-muted);text-transform:uppercase;margin-bottom:12px}.toc-sidebar a{display:block;color:var(--text-tertiary);text-decoration:none;transition:color .2s}.toc-sidebar a:hover{color:var(--text)}.toc-sidebar a.toc-active{color:var(--text);font-weight:500}.toc-sub{padding-left:12px;color:var(--text-tertiary)}.toc-dropdown{display:none;padding:16px var(--space-page);border-bottom:1px solid var(--border)}.toc-dropdown summary{font-family:system-ui,-apple-system,sans-serif;font-size:13px;color:var(--text-tertiary);cursor:pointer;list-style:none}.toc-dropdown summary:before{content:"▸ "}.toc-dropdown[open] summary:before{content:"▾ "}.toc-dropdown nav{padding-top:12px;font-family:system-ui,-apple-system,sans-serif;font-size:13px;line-height:2}.toc-dropdown nav a{display:block;color:var(--text-tertiary);text-decoration:none}.prose-cta{margin-top:64px;padding-top:32px;border-top:1px solid var(--border)}.prose-cta p{color:var(--text-tertiary);font-style:italic}.prose-cta a{color:var(--text)}.back-to-top{display:block;margin-top:48px;font-family:system-ui,-apple-system,sans-serif;font-size:13px;color:var(--text-muted);text-decoration:none;transition:color .2s}.back-to-top:hover{color:var(--text-tertiary)}.contact{display:flex;align-items:center;justify-content:center;flex:1;padding:48px}.contact-inner{max-width:480px}.contact-inner h1{font-size:28px;font-weight:400;line-height:1.3;margin-bottom:24px}.contact-rule{width:40px;height:2px;background:var(--text);margin-bottom:24px;border:none}.contact-inner p{color:var(--text-secondary);margin-bottom:16px;line-height:1.7}.contact-inner .contact-email{display:inline-block;font-size:18px;margin-top:8px}.contact-meta{font-family:system-ui,-apple-system,sans-serif;font-size:15px;color:var(--text-muted);margin-top:32px}.not-found{display:flex;align-items:center;justify-content:center;flex:1;text-align:center;padding:48px}.not-found h1{font-size:28px;font-weight:400;line-height:1.3;margin-bottom:12px}.not-found p{color:var(--text-tertiary);margin-bottom:24px}.not-found a{font-family:system-ui,-apple-system,sans-serif;font-size:13px}.nav-toggle{display:none;background:none;border:none;font-size:20px;cursor:pointer;color:var(--text-tertiary);min-width:44px;min-height:44px;align-items:center;justify-content:center}@media(max-width:1024px){.toc-sidebar{display:none}.toc-dropdown{display:block}}@media(max-width:768px){.nav{padding:16px var(--space-page)}.nav-links{display:none}.nav-links.open{display:flex;flex-direction:column;position:absolute;top:56px;right:24px;background:var(--bg);border:1px solid var(--border);padding:16px 24px;gap:16px;z-index:10}.nav-toggle{display:flex}.cards{flex-direction:column}.footer{padding:16px var(--space-page);flex-direction:column;gap:8px;font-size:14px}.footer a{padding:4px 0}}