:root{--bg-base:#f7f5f1;--bg-surface:#fff;--bg-surface-elevated:#fff;--bg-hero:#f7f5f1;--bg-section-alt:#edeae4;--bg-pinned:#edeae4;--text-primary:#16181c;--text-secondary:#585d66;--text-tertiary:#8a8f99;--text-on-dark:#f2f0ec;--accent:#af2624;--accent-strong:#8a1c1a;--accent-hover:#c43e3c;--accent-text:#af2624;--accent-glow:#af26241f;--border-subtle:#0000000f;--border-medium:#0000001a;--border-strong:#0000002e;--shadow-sm:0 1px 2px #0000000a;--shadow-md:0 4px 16px #0000000f;--shadow-lg:0 12px 40px #0000001a;--blueprint-line:#00000006;--corner-mark:var(--accent);--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--text-xs:clamp(.75rem, .7rem + .2vw, .875rem);--text-sm:clamp(.875rem, .82rem + .25vw, 1rem);--text-base:clamp(1rem, .95rem + .25vw, 1.125rem);--text-lg:clamp(1.125rem, 1rem + .5vw, 1.375rem);--text-xl:clamp(1.5rem, 1.2rem + 1vw, 2rem);--text-2xl:clamp(2rem, 1.5rem + 1.5vw, 3rem);--text-3xl:clamp(2.5rem, 1.8rem + 2.5vw, 4.5rem);--text-4xl:clamp(3.5rem, 2.2rem + 4vw, 7rem);--leading-tight:1.05;--leading-snug:1.2;--leading-normal:1.55;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--space-24:6rem;--space-32:8rem;--space-40:10rem;--radius-sm:4px;--radius-md:8px;--radius-lg:16px;--container-max:1280px;--container-pad:var(--space-6)}[data-theme=dark]{--bg-base:#0b0c0e;--bg-surface:#121417;--bg-surface-elevated:#1b1d22;--bg-hero:#08090b;--bg-section-alt:#0f1013;--bg-pinned:#0f1013;--text-primary:#f2f0ec;--text-secondary:#a6a9b0;--text-tertiary:#6b707a;--accent:#d14a48;--accent-strong:#c43e3c;--accent-hover:#e06664;--accent-text:#d14a48;--accent-glow:#d14a4826;--border-subtle:#ffffff0d;--border-medium:#ffffff14;--border-strong:#ffffff24;--shadow-sm:0 1px 2px #0003;--shadow-md:0 4px 16px #0000004d;--shadow-lg:0 12px 40px #0006;--blueprint-line:#ffffff0a;--corner-mark:var(--accent)}@media (prefers-color-scheme:dark){:root:not([data-theme]){--bg-base:#0b0c0e;--bg-surface:#121417;--bg-surface-elevated:#1b1d22;--bg-hero:#08090b;--bg-section-alt:#0f1013;--bg-pinned:#0f1013;--text-primary:#f2f0ec;--text-secondary:#a6a9b0;--text-tertiary:#6b707a;--accent:#d14a48;--accent-strong:#c43e3c;--accent-hover:#e06664;--accent-text:#d14a48;--accent-glow:#d14a4826;--border-subtle:#ffffff0d;--border-medium:#ffffff14;--border-strong:#ffffff24;--shadow-sm:0 1px 2px #0003;--shadow-md:0 4px 16px #0000004d;--shadow-lg:0 12px 40px #0006;--blueprint-line:#ffffff0a;--corner-mark:var(--accent)}}*,:before,:after{box-sizing:border-box}html{font-family:var(--font-sans);color:var(--text-primary);background:var(--bg-base);transition:background-color .35s,color .35s}body{line-height:var(--leading-normal);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0}h1,h2,h3,h4{line-height:var(--leading-tight);letter-spacing:-.02em;margin:0;font-weight:700}p{margin:0}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}.container{max-width:var(--container-max);padding-inline:var(--container-pad);margin-inline:auto}@media (width>=768px){:root{--container-pad:var(--space-8)}}@media (width>=1024px){:root{--container-pad:var(--space-12)}}.btn{justify-content:center;align-items:center;gap:var(--space-2);border-radius:var(--radius-sm);font-weight:600;font-size:var(--text-sm);letter-spacing:.01em;cursor:pointer;border:1px solid #0000;padding:.85rem 1.75rem;transition:transform .15s,background-color .2s,border-color .2s;display:inline-flex}@media (prefers-reduced-motion:reduce){.btn{transition:none}}.btn--primary{background:var(--accent-strong);color:#fff}.btn--primary:hover{background:var(--accent-hover)}.btn--ghost{border-color:var(--border-strong);color:var(--text-primary)}.btn--ghost:hover{background:var(--accent-glow);border-color:var(--accent)}.blueprint-grid{position:relative}.blueprint-grid:before{content:"";pointer-events:none;background-image:linear-gradient(var(--blueprint-line) 1px, transparent 1px), linear-gradient(90deg, var(--blueprint-line) 1px, transparent 1px);background-size:48px 48px;position:absolute;inset:0;mask-image:radial-gradient(#000 35%,#0000 80%)}.corner-marks{position:relative}.corner-marks:before,.corner-marks:after{content:"";pointer-events:none;z-index:2;width:20px;height:20px;position:absolute}.corner-marks:before{border-top:2px solid var(--corner-mark);border-left:2px solid var(--corner-mark);top:12px;left:12px}.corner-marks:after{border-top:2px solid var(--corner-mark);border-right:2px solid var(--corner-mark);top:12px;right:12px}.section-index{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--accent-text);letter-spacing:.08em;text-transform:uppercase;margin-bottom:var(--space-4);align-items:center;gap:.6rem;display:inline-flex}.section-index:before{content:"";background:currentColor;width:24px;height:1px;display:inline-block}.skip-link{z-index:9999;background:var(--accent-strong);color:#fff;border-radius:var(--radius-sm);padding:.75rem 1.25rem;font-weight:600;position:absolute;top:-100%;left:.5rem}.skip-link:focus{top:.5rem}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.visually-hidden{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}:root{--space-5:1.25rem}.chapter{background:var(--bg-base);border-top:1px solid var(--border-medium);padding-block:100px}.chapter-heading{grid-template-columns:1fr 2fr;align-items:start;gap:32px;display:grid}.chapter-heading h2{letter-spacing:-.04em;font-size:clamp(30px,3.5vw,48px);font-weight:500;line-height:1.15}.chapter-heading .section-index{margin-top:10px;font-size:11px}section[id]{scroll-margin-top:90px}@media (width<=700px){.chapter{padding-block:64px}.chapter-heading{grid-template-columns:1fr;gap:12px}.chapter-heading .section-index{margin:0}}:root{--drawing-inset:max(8px,calc((100% - var(--container-max)) / 2 - 24px));--drawing-line:var(--border-medium);--drawing-tick:var(--border-strong)}body{isolation:isolate;position:relative}body:before{content:"";z-index:101;pointer-events:none;background:linear-gradient(var(--drawing-line),var(--drawing-line)) left var(--drawing-inset) top/1px 100% no-repeat,linear-gradient(var(--drawing-line),var(--drawing-line)) right var(--drawing-inset) top/1px 100% no-repeat;position:fixed;inset:0}.chapter,.site-footer{position:relative}.chapter:after,.site-footer:after{content:"";pointer-events:none;background:linear-gradient(var(--drawing-tick),var(--drawing-tick)) left calc(var(--drawing-inset) - 4px) top 4px/9px 1px no-repeat,linear-gradient(var(--drawing-tick),var(--drawing-tick)) right calc(var(--drawing-inset) - 4px) top 4px/9px 1px no-repeat,linear-gradient(var(--drawing-tick),var(--drawing-tick)) left var(--drawing-inset) top/1px 9px no-repeat,linear-gradient(var(--drawing-tick),var(--drawing-tick)) right var(--drawing-inset) top/1px 9px no-repeat;height:9px;position:absolute;top:-5px;left:0;right:0}.chapter-heading>.section-index,.hero__copy>.section-index{gap:8px}.chapter-heading>.section-index:before,.hero__copy>.section-index:before{width:16px;margin-left:0}@media (width<=767px){:root{--drawing-inset:6px}.chapter-heading>.section-index:before,.hero__copy>.section-index:before{width:16px;margin-left:0}}