.auth-card {
    max-width: 450px;
    margin: 80px auto;
    border: none;
    border-radius: 28px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
.auth-header {
    background: linear-gradient(135deg, #00c853 0%, #009624 100%);
    border-radius: 28px 28px 0 0;
    padding: 25px;
    text-align: center;
}
.auth-header h3 {
    color: white;
    font-weight: 800;
    margin: 0;
}
.auth-body {
    padding: 30px;
}
.input-group-text {
    background-color: #f8f9fa;
    border-left: none;
}
.form-control:focus {
    border-color: #00c853;
    box-shadow: 0 0 0 0.2rem rgba(0,200,83,0.25);
}
.btn-auth {
    background-color: #00c853;
    border: none;
    padding: 12px;
    font-weight: 700;
    border-radius: 40px;
    transition: all 0.3s;
}
.btn-auth:hover {
    background-color: #00b048;
    transform: translateY(-2px);
}
.auth-footer {
    text-align: center;
    margin-top: 20px;
    color: #6c757d;
}
.auth-footer a {
    color: #00c853;
    font-weight: 600;
    text-decoration: none;
}
.messages {
    list-style: none;
    padding: 0;
}
.messages li {
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
}
.messages .error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}
.messages .success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
@media (max-width: 576px) {
    .auth-card {
        margin: 40px 15px;
    }
    .auth-body {
        padding: 20px;
    }
}