:root{--bg:#f7f5ef;--fg:#0f2b25;--ac:#d9b45b;--mut:#4a5f59}
@media(prefers-color-scheme:dark){:root{--bg:#0f2b25;--fg:#f1eee4;--ac:#d9b45b;--mut:#b5c4bf}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
main{max-width:46rem;margin:0 auto;padding:1.5rem 1rem 3rem}
header.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}
header.top a{color:var(--fg);font-weight:700;text-decoration:none}
h1{font-size:1.8rem;line-height:1.2}h2{font-size:1.2rem;margin-top:2rem}h3{font-size:1.02rem}
a{color:inherit;text-decoration-color:var(--ac);text-underline-offset:3px}
.stand,.hint{color:var(--mut);font-size:.9rem}
footer{border-top:1px solid var(--ac);margin-top:2.5rem;padding-top:1rem;font-size:.9rem;display:flex;flex-wrap:wrap;gap:.5rem 1.2rem}
label{display:block;font-weight:600;margin:1rem 0 .3rem}
input,textarea{width:100%;font:inherit;padding:.7rem;border:1px solid var(--mut);border-radius:.5rem;background:transparent;color:inherit}
button{font:inherit;font-weight:700;padding:.8rem 1.2rem;border:0;border-radius:.5rem;background:var(--ac);color:#0f2b25;cursor:pointer;margin:1rem .5rem 0 0}
button.sec{background:transparent;color:inherit;border:1px solid var(--mut)}
button:disabled{opacity:.6}
.box{border:1px solid var(--ac);border-radius:.6rem;padding:1rem;margin:1rem 0}
.err{color:#b3261e;font-weight:600}
@media(prefers-color-scheme:dark){.err{color:#ff9a8a}}