:root{--bg:#f4fbfa;--fg:#161d1d;--muted:#3f4948;--primary:#00696b;--on-primary:#fff;--card:#fff;--line:#bec9c8}
@media (prefers-color-scheme:dark){:root{--bg:#0e1415;--fg:#dde4e3;--muted:#bec9c8;--primary:#80d4d6;--on-primary:#003738;--card:#1a2121;--line:#3f4948}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:640px;margin:0 auto;padding:40px 20px 64px}h1{font-size:2rem;line-height:1.2;margin:0 0 8px}
h2{font-size:1.15rem;margin:28px 0 6px}p,li{color:var(--fg)}.muted{color:var(--muted)}
.brand{color:var(--primary);font-weight:700;letter-spacing:.01em}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin:20px 0}
.button{display:inline-block;background:var(--primary);color:var(--on-primary);text-decoration:none;font-weight:600;border:0;border-radius:999px;padding:12px 22px;font-size:1rem;cursor:pointer}
.code{font:600 1.6rem/1.2 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.12em}
label{display:block;font-weight:600;margin:14px 0 6px}input{width:100%;padding:12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--fg);font-size:1rem}
footer{margin-top:40px;font-size:.9rem}footer a{color:var(--muted);margin-right:16px}