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

.login-container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
}

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

.login-header h1 {
    color: #333;
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 28px;
}

.login-header p {
    color: #666;
    margin: 0;
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s, box-shadow 0.3s;
    box-sizing: border-box;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
    color: white;
    text-decoration: none;
}

.btn-login:active {
    transform: translateY(0);
}

.alert-container {
    margin-bottom: 20px;
}

.alert {
    padding: 12px 15px;
    border-radius: 5px;
    font-size: 14px;
    margin-bottom: 0;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.validation-error {
    color: #dc3545;
    font-size: 13px;
    margin-top: 5px;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 12px;
    color: #666;
}

.btn-login:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    margin-right: 0.5rem;
}

/* Mobile responsive */
@media (max-width: 576px) {
    .login-card {
        padding: 30px 20px;
    }

    .login-header h1 {
        font-size: 24px;
    }

    .form-group input {
        padding: 10px 12px;
        font-size: 16px;
    }

    .btn-login {
        padding: 10px;
        font-size: 14px;
    }
}