body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

.login-box {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #34495e;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border 0.3s;
}

.form-group input:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.button {
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s;
}

.button:hover {
    background-color: #2980b9;
}

.login-help {
    margin-top: 1.5rem;
    color: #7f8c8d;
    text-align: center;
    font-size: 0.9rem;
}

.alert {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.logo {
    text-align: center;
    margin-bottom: 2rem;
}

.logo img {
    max-width: 150px;
    height: auto;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem 0;
    font-size: 0.9rem;
}

@media (max-width: 576px) {
    .login-box {
        padding: 1.5rem;
    }

    main {
        padding: 1rem;
    }
}