:root {
    color-scheme: dark;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top, #1e3a5f 0, #111827 38%, #0b1220 100%);
    color: #f8fafc;
    font-family: Arial, sans-serif;
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-card {
    width: min(430px, 100%);
    padding: 32px;
    border: 1px solid #334155;
    border-radius: 16px;
    background: rgba(15, 23, 42, .96);
    box-shadow: 0 24px 70px rgba(0, 0, 0, .45);
}

.brand {
    color: #60a5fa;
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: .04em;
}

h1 {
    margin: 8px 0 4px;
    font-size: 1.8rem;
}

.subtitle {
    margin-bottom: 24px;
    color: #94a3b8;
}

label {
    margin: 14px 0 6px;
}

.form-control {
    border-color: #334155;
    background: #111827;
    color: #f8fafc;
}

.form-control:focus {
    border-color: #3b82f6;
    background: #111827;
    color: #f8fafc;
    box-shadow: 0 0 0 .2rem rgba(59, 130, 246, .18);
}