:root {
    --primary-color: #4e73df;
    --secondary-color: #858796;
    --success-color: #1cc88a;
    --danger-color: #e74a3b;
    --warning-color: #f6c23e;
    --info-color: #36b9cc;
    --light-color: #f8f9fc;
    --dark-color: #5a5c69;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header i {
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.auth-header h2 {
    color: #2c3e50;
    font-weight: 700;
    margin-bottom: 10px;
}

.auth-form .form-label {
    font-weight: 600;
    color: #5a5c69;
    margin-bottom: 8px;
}

.auth-form .form-control {
    border-radius: 8px;
    padding: 12px 15px;
    border: 1px solid #d1d3e2;
    transition: all 0.3s ease;
}

.auth-form .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
}

.auth-form .btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.auth-form .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.auth-form .btn-success {
    background: linear-gradient(135deg, #1cc88a 0%, #13855c 100%);
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.auth-form .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(28, 200, 138, 0.4);
}

.auth-form .btn-outline-secondary {
    border-color: #d1d3e2;
}

.auth-form .btn-outline-secondary:hover {
    background-color: #f8f9fc;
    border-color: #d1d3e2;
    color: #5a5c69;
}

.auth-form a {
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.auth-form a:hover {
    color: #2e59d9;
}

.alert {
    border-radius: 8px;
    border: none;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Responsive */
@media (max-width: 576px) {
    .auth-card {
        padding: 30px 20px;
    }
    
    .auth-header i {
        font-size: 2.5rem !important;
    }
    
    .auth-header h2 {
        font-size: 1.5rem;
    }
}