:root{color-scheme:light dark;--bg:#f6f7f9;--fg:#1b2430;--card:#fff;--line:#c9d1dc;--accent:#2b3a4b;--muted:#5b6776}
@media (prefers-color-scheme:dark){:root{--bg:#10151c;--fg:#e8edf3;--card:#18202a;--line:#34404e;--accent:#8fb3d9;--muted:#9aa7b6}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:34rem;margin:8vh auto;padding:1.5rem;background:var(--card);border:1px solid var(--line);border-radius:12px}
h1{font-size:1.4rem;margin:0 0 1rem}
button{font:inherit;font-weight:600;padding:.7rem 1.4rem;border-radius:999px;border:0;background:var(--accent);color:var(--bg);cursor:pointer}
button:disabled{opacity:.6;cursor:wait}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #3b82f6;outline-offset:2px}
input,textarea{width:100%;font:inherit;padding:.6rem .8rem;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg)}
textarea{font-family:ui-monospace,Consolas,monospace;font-size:.8rem;word-break:break-all}
.muted{color:var(--muted);font-size:.9rem}
#status{min-height:1.5rem}
#status.error{color:#c0392b;font-weight:600}
@media (max-width:600px){main{margin:0;border-radius:0;border-width:1px 0}}