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2rem);max-width:260px}}.chapter__body{font-size:17px;line-height:1.55}.chapter__body h2{padding-bottom:.2em;font-size:1.4rem}.chapter__body h3{font-size:1.1rem}@media (width<=900px){.chapter__body{column-count:1;column-rule:none}}.btn{background:var(--color-accent);color:#fff;border-radius:var(--radius);font-family:var(--font-heading);letter-spacing:.04em;padding:.6em 1.2em;text-decoration:none;display:inline-block}.btn:hover{color:#fff;background:#000}.btn--ghost{color:var(--color-ink);border:1px solid var(--color-border-strong);background:0 0}.btn--ghost:hover{background:var(--color-surface);color:var(--color-ink)}.toc-grid{gap:var(--space-4);margin-top:var(--space-8);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));display:grid}.toc-card{padding:var(--space-4);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);color:inherit;text-decoration:none;transition:border-color .15s;display:block}.toc-card:hover{border-color:var(--color-accent-soft);color:inherit}.toc-card h3{margin:0 0 var(--space-2);font-size:1.1rem}.toc-card p{color:var(--color-muted);margin:0;font-size:.95em}.mobile-menu{z-index:200;background:var(--color-bg);-webkit-overflow-scrolling:touch;visibility:hidden;position:fixed;inset:0;overflow-y:auto}.mobile-menu.is-open{visibility:visible}.mobile-menu__inner{padding:var(--space-6) var(--space-4) var(--space-8);flex-direction:column;min-height:100%;display:flex}.mobile-menu__top{margin-bottom:var(--space-3);justify-content:space-between;align-items:flex-start;display:flex}.mobile-menu__brand{font-family:var(--font-heading);letter-spacing:.06em;text-transform:uppercase;color:var(--color-ink);font-size:1.9rem;font-weight:700;line-height:1;text-decoration:none}.mobile-menu__brand span{color:var(--color-accent)}.mobile-menu__close{border:1px solid var(--color-border-strong);cursor:pointer;background:0 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var(--color-border);font-size:.82rem;text-decoration:none;display:inline-block}.mobile-menu__github:hover{color:var(--color-ink)}.mobile-menu__nav{flex:1}.mobile-menu__group{margin-bottom:var(--space-6)}.mobile-menu__group-title{font-family:var(--font-heading);letter-spacing:.12em;text-transform:uppercase;color:var(--color-muted);margin:0 0 var(--space-2);padding-bottom:var(--space-2);border-bottom:1px solid var(--color-border);border-top:none;font-size:.82rem;font-weight:700}.mobile-menu__list{margin:0;padding:0;list-style:none}.mobile-menu__list li{margin:0}.mobile-menu__link{color:var(--color-ink);border-radius:var(--radius);border-left:2px solid #0000;padding:.5em .6em;font-size:1.05rem;text-decoration:none;display:block}.mobile-menu__link:hover{border-left-color:var(--color-accent);background:#0000000a}.site-header__menu-btn:focus-visible,.mobile-menu__close:focus-visible,.mobile-menu__link:focus-visible{outline:2px solid var(--color-ink);outline-offset:2px}.chapter-toc{display:none}.chapter-toc__list{margin:0;padding:0;list-style:none}.chapter-toc__item{margin:0}.chapter-toc__item a{padding:.3em var(--space-2);color:var(--color-muted);border-left:2px solid #0000;font-size:.95em;text-decoration:none;display:block}.chapter-toc__item a:hover{color:var(--color-ink);border-left-color:var(--color-accent)}.chapter-toc__item--depth-3 a{padding-left:var(--space-6);font-size:.88em}