body{font-family:sans-serif;margin:0;background:#f6f7fb;color:#222}
.nav{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background:#111;color:#fff}
.nav a{color:#fff;margin-right:12px;text-decoration:none}
.container{max-width:900px;margin:24px auto;padding:0 12px}
.card{background:#fff;padding:16px;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,.06);display:flex;flex-direction:column;gap:10px}
label{display:flex;flex-direction:column;font-size:.9rem}
input,textarea,button{padding:10px;border-radius:8px;border:1px solid #ddd}
button{cursor:pointer}
.error{background:#ffd7d7;border:1px solid #ff8b8b;padding:8px;border-radius:8px}
.list{background:#fff;padding:12px;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,.06)}