body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #e0f7e9, #c8e6c9);
}

.page-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    width: 90%;
}

.logo-container {
    margin-bottom: 15px;
    text-align: center;
}

.logo-container img {
    max-width: 200px;
    height: auto;
}

@media (max-width: 400px) {
    .logo-container img {
        max-width: 150px;
    }
}


.form-container {
    width: 100%;
    max-width: 600px; /* Tăng từ 500px lên 600px */
    padding: 20px;    /* Tăng padding giúp nội dung thoáng hơn */
    background: white;
    border-radius: 10px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    box-sizing: border-box;
}

h2 {
    text-align: center;
    color: #2e7d32;
    margin-bottom: 5px;
}

label {
    font-weight: 600;
    display: block;
    margin-top: 5px;
}

input[type="text"], input[type="password"] {
    width: 100%; /* full chiều rộng */
    padding: 10px;
    margin-top: 6px;
    border: 1px solid #ccc;
    border-radius: 6px;
    transition: border 0.3s ease;
    box-sizing: border-box;
}


input:focus {
    border-color: #4CAF50;
    outline: none;
}

button {
    width: 100%;
    margin-top: 15px;
    padding: 10px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background: #388e3c;
}

.error-msg {
    color: red;
    text-align: center;
    margin-bottom: 10px;
}


@media (max-width: 400px) {
    body {
        padding: 10px;
    }

    .form-container {
        padding: 10px;
        max-width: 95%;
    }

    button {
        font-size: 15px;
    }
}