*{box-sizing:border-box} :root{--bg:#f7f7f6;--text:#171717;--muted:#525252;--border:#d8d8d6;--link:#0068c2}body{margin:0;padding-top:var(--header-h);background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}main{max-width:780px;margin:auto;padding:2.2rem 1.25rem 3rem}article{background:var(--surface,#fff);border:1px solid var(--border);border-radius:16px;padding:2rem}nav.product-nav{display:flex;flex-wrap:wrap;gap:1.2rem;margin-bottom:1.6rem}a{color:var(--link);text-underline-offset:3px}a:focus-visible,button:focus-visible{outline:2px solid var(--link);outline-offset:4px}h1{font-size:clamp(1.8rem,5vw,2.5rem);line-height:1.15;letter-spacing:-.035em;margin:0 0 1rem}h2{font-size:1.1rem;margin:1.8rem 0 .5rem;line-height:1.4}p{margin:.5rem 0 1rem;color:var(--muted);overflow-wrap:anywhere}.meta{font-size:.8rem;color:var(--muted)}.contact{border-top:1px solid var(--border);padding-top:1.4rem;margin-top:2rem}.contact a{display:inline-block;min-height:44px;padding:.5rem 0}@media(max-width:600px){main{padding:1.2rem .85rem 2rem}article{padding:1.2rem;border-radius:12px}nav.product-nav{gap:1rem}h2{margin-top:1.5rem}}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#191a18;--surface:#232420;--text:#eeeee8;--muted:#afafa5;--border:#3c3d36;--link:#91c8ff}}
.site-header--light{background:var(--bg);border-color:var(--border)}.site-header--light a,.site-header--light .lang-switch button{color:var(--muted)}.site-header--light a:hover{color:var(--text)}.site-header--light .lang-switch{background:var(--surface,#fff)}.site-header--light .lang-switch button[data-active=true]{background:var(--text);border-color:var(--text);color:var(--bg)}

/* Public component roles; shared geometry lives in product-chrome.css. */
.ktb-footer{--ktb-ink:var(--text);--ktb-muted:var(--muted);--ktb-line:var(--border);--ktb-width:780px;--ktb-gutter:1.25rem}

/* The preview download is a primary action on the existing reading surface. */
.download [download]{display:inline-flex;align-items:center;min-height:44px;max-width:100%;padding:.55rem .9rem;border-radius:6px;background:var(--link);color:var(--bg);font-weight:600;text-decoration:none}
.download [download]:hover{background:color-mix(in oklab,var(--link) 85%,var(--text))}