body {
    font-family: Arial, sans-serif;
    background-color: #006400; /* ????? ????? ????? */
    color: #333;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background-color: #0056b3; /* ???? ???? ??? */
    color: white; /* ?? ???? */
    padding: 1.5rem 1rem; /* ????? ????? ???? ?????? */
    text-align: center; /* ?????? ???? ????? */
    font-family: 'Arial', sans-serif; /* ?? ???? */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); /* ?? ???? */
    border-bottom: 3px solid #002411; /* ?? ???? ???? ???? */
}

    header h1 {
        margin: 0; /* ????? ??????? ?????????? */
        font-size: 2.2rem; /* ??? ?? ???? */
        letter-spacing: 1px; /* ????? ??? ?????? */
    }

    /* ????? ???? ???? */
    header:hover {
        background-color: #002411; /* ??? ???? ??? ??????? */
        transition: background-color 0.3s ease;
    }

main {
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

section {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h2 {
    color: #0056b3;
    border-bottom: 2px solid #0056b3;
    padding-bottom: 10px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input, select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background-color: #0056b3;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

    button:hover {
        background-color: #003d82;
    }

#invoice-items {
    margin: 20px 0;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 4px;
    min-height: 100px;
}

.invoice-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.total {
    font-size: 18px;
    text-align: right;
    margin: 15px 0;
}

footer {
    background-color: #0056b3;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 20px;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
}