:root{--bg:#fff;--fg:#1c2128;--muted:#59636e;--line:#d1d9e0;--card:#f6f8fa;--accent:#0b5fd6;--accent-fg:#fff;--code:#eef1f4}
@media (prefers-color-scheme:dark){:root{--bg:#0d1117;--fg:#e6edf3;--muted:#9198a1;--line:#30363d;--card:#161b22;--accent:#4493f8;--accent-fg:#0d1117;--code:#1c2128}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}
a{color:var(--accent)}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:.92em}
code{background:var(--code);padding:.1em .35em;border-radius:4px}
pre{background:var(--code);border:1px solid var(--line);border-radius:6px;padding:12px 14px;overflow-x:auto;margin:12px 0}
pre code{background:none;padding:0}
header.hero{padding:72px 0 48px;border-bottom:1px solid var(--line)}
.mark{display:block;margin:0 0 18px}.mark img{display:block;width:56px;height:56px}
h1{font-size:2.6rem;line-height:1.15;margin:0 0 8px;letter-spacing:-.02em}
.tag{font-size:1.25rem;color:var(--muted);margin:0 0 20px}
.badge{display:inline-block;font-size:.8rem;border:1px solid var(--line);background:var(--card);color:var(--muted);border-radius:999px;padding:2px 10px;margin-bottom:20px}
.lead{margin:0 0 24px}
.btns{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;padding:9px 18px;border-radius:6px;border:1px solid var(--accent);text-decoration:none;font-weight:600}
.btn.primary{background:var(--accent);color:var(--accent-fg)}
section{padding:40px 0;border-bottom:1px solid var(--line)}
h2{font-size:1.5rem;margin:0 0 16px}
ol.principles{padding-left:1.3em;margin:0}
ol.principles li{margin-bottom:12px}
ul.formats{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
ul.formats li{border:1px solid var(--line);background:var(--card);border-radius:6px;padding:8px 12px;display:flex;justify-content:space-between;gap:8px}
ul.formats span{color:var(--muted);font-size:.8rem;align-self:center}
.note{color:var(--muted);font-size:.95rem}
footer{padding:28px 0 48px;color:var(--muted);font-size:.9rem}
footer a{color:var(--muted)}
@media (max-width:480px){h1{font-size:2.1rem}header.hero{padding-top:48px}}