* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: radial-gradient(700px 400px at 50% 20%, #1c2640 0%, #0f0f13 70%);
    background-color: #0f0f13;
    color: #ededf2;
    font: 16px/1.6 "Segoe UI", system-ui, sans-serif;
}

main { width: 100%; max-width: 560px; text-align: center; }

.logo { margin: 0 auto 18px; border-radius: 24px; }

h1 { font-size: 40px; margin: 0 0 10px; font-weight: 700; }

.lead { color: #b4b4c0; margin: 0 0 32px; }

form { display: flex; gap: 10px; }

input {
    flex: 1; min-width: 0; padding: 12px 14px; border-radius: 10px;
    background: #16161c; color: #ededf2; border: 1px solid #2c2c36;
    font: 600 16px Consolas, ui-monospace, monospace; letter-spacing: .03em; text-transform: uppercase; text-align: center;
}
input::placeholder { color: #55555f; font-weight: 400; }
input:focus { outline: 2px solid #4c8dff; border-color: transparent; }

button {
    padding: 12px 22px; border: none; border-radius: 10px; cursor: pointer;
    background: #4c8dff; color: #fff; font: 600 16px "Segoe UI", system-ui, sans-serif;
}
button:hover { background: #5d98ff; }
button:disabled { opacity: .6; cursor: default; }

.message { min-height: 24px; margin: 12px 0 0; font-size: 15px; }
.message.error { color: #ff8a8d; }
.message.success { color: #6fdc9e; }

.hint { color: #8a8a96; font-size: 14px; margin: 26px 0 8px; }
.hint strong { color: #c4c4cf; font-weight: 600; }

.meta { color: #62626e; font-size: 13px; margin: 0; }

@media (max-width: 520px) {
    form { flex-direction: column; }
}