* { box-sizing: border-box; }
body {
    background: #0f0f10; color: #888;
    font-family: system-ui, -apple-system, sans-serif;
    display: grid; place-items: center; min-height: 100vh; margin: 0;
}
form {
    background: #18181a; padding: 28px 32px;
    border-radius: 10px; min-width: 280px; max-width: 320px;
    border: 1px solid #2a2a2c;
}
.h {
    color: #666; font-size: 11px; font-weight: 500;
    letter-spacing: 0.08em; text-transform: uppercase;
    margin: 0 0 18px 0; text-align: center;
}
input {
    width: 100%; padding: 11px 12px;
    background: #0a0a0b; color: #ddd;
    border: 1px solid #2a2a2c; border-radius: 6px;
    font-size: 14px; outline: none;
}
input:focus { border-color: #444; }
button {
    width: 100%; padding: 11px;
    margin-top: 12px;
    background: #2a2a2c; color: #ccc;
    border: 0; border-radius: 6px;
    cursor: pointer; font-size: 13px;
    transition: background .15s;
}
button:hover { background: #353537; }
.err {
    color: #b04848; font-size: 11px;
    margin-top: 10px; text-align: center;
}