body {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
                url('https://images.unsplash.com/photo-1556740714-a839678369a0?auto=format&fit=crop&w=1920') no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Inter', sans-serif;
    color: #ffffff;
}
.card {
    background: rgba(255, 255, 255, 0.95);
    border: none;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    max-width: 400px;
    width: 100%;
    color: #1f2937;
}
.card-header {
    background: #4f46e5;
    color: white;
    border-radius: 16px 16px 0 0 !important;
    text-align: center;
    padding: 1.5rem;
}
.btn-primary {
    background: #4f46e5;
    border: none;
    border-radius: 8px;
    padding: 0.75rem;
    font-weight: 600;
    transition: background 0.3s ease;
}
.btn-primary:hover {
    background: #4338ca;
}
.form-control {
    border-radius: 8px;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
}
.form-control:focus {
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
    border-color: #4f46e5;
}
.form-label {
    color: #1f2937;
}