* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
    font-family: 'Poppins', sans-serif;
    background:
        radial-gradient(circle at top left, rgba(59,130,246,.2), transparent 35%),
        radial-gradient(circle at bottom right, rgba(236,72,153,.16), transparent 30%),
        #080710;
    color: #fff;
}
.auth-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.auth-card {
    width: 100%;
    max-width: 460px;
    background: rgba(17, 24, 39, .78);
    border: 1px solid rgba(255,255,255,.08);
    box-shadow: 0 30px 60px rgba(0,0,0,.35);
    backdrop-filter: blur(18px);
    border-radius: 28px;
    padding: 34px;
}
.brand-badge {
    display: inline-flex;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(59,130,246,.16);
    color: #93c5fd;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .4px;
    margin-bottom: 14px;
}
.auth-card h1 {
    font-size: 30px;
    line-height: 1.2;
    margin: 0 0 8px;
}
.subtitle {
    color: #cbd5e1;
    margin: 0 0 22px;
    font-size: 14px;
}
.auth-form label {
    display: block;
    margin-top: 14px;
    margin-bottom: 8px;
    font-size: 14px;
    color: #dbeafe;
}
.auth-form input {
    width: 100%;
    height: 54px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,.08);
    background: rgba(255,255,255,.05);
    color: #fff;
    padding: 0 16px;
    font-size: 14px;
}
.auth-form input::placeholder { color: #94a3b8; }
button {
    width: 100%;
    margin-top: 20px;
    border: 0;
    height: 54px;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: #fff;
    box-shadow: 0 18px 30px rgba(37,99,235,.28);
}
button:hover { transform: translateY(-1px); }
.alert {
    margin-bottom: 16px;
    padding: 14px 16px;
    border-radius: 16px;
    font-size: 14px;
}
.alert.success { background: rgba(34,197,94,.16); color: #bbf7d0; border: 1px solid rgba(34,197,94,.3); }
.alert.error { background: rgba(239,68,68,.16); color: #fecaca; border: 1px solid rgba(239,68,68,.3); }
.auth-links { margin-top: 18px; text-align: center; }
.auth-links.stacked { display: flex; flex-direction: column; gap: 10px; }
.auth-links a {
    color: #93c5fd;
    text-decoration: none;
    font-size: 14px;
}
.auth-links a:hover { text-decoration: underline; }
@media (max-width: 560px) {
    .auth-card { padding: 24px; border-radius: 22px; }
    .auth-card h1 { font-size: 25px; }
}