*{margin:0;padding:0;box-sizing:border-box}
body{min-height:100vh;display:flex;justify-content:center;align-items:center;background:#f5f7fa;font-family:system-ui,sans-serif;padding:15px}
.c{background:#fff;border-radius:10px;box-shadow:0 4px 12px rgba(0,0,0,.08);max-width:500px;width:100%;padding:25px;text-align:center}
h1{font-size:2.5rem;color:#e53e3e;margin-bottom:8px}
.h p{font-size:1.1rem;color:#4a5568;margin-bottom:15px}
.e{background:#f8f9fa;padding:12px;border-radius:8px;border-left:3px solid #e53e3e;margin:20px 0;text-align:left;font-size:.9rem}
.e p{margin:4px 0;color:#4a5568}
.a{margin-top:20px}
.b{padding:10px 30px;border-radius:6px;font-weight:600;cursor:pointer;border:none;font-size:.9rem;background:#e53e3e;color:#fff}
@media(max-width:480px){.b{width:100%}}