body {
    padding: 20px;
    max-width: 100%;
    overflow-x: hidden;
}

#backButton {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 10px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    z-index: 1000;
}

#backButton:hover {
    background-color: #0056b3;
}

#helpButton {
    position: absolute;
    top: 10px;
    right: 90px;
    padding: 10px 15px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    z-index: 1000;
}

#helpButton:hover {
    background-color: #218838;
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    margin: 0;
    color: #333;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    width: 30px;
    height: 30px;
    line-height: 28px;
}

.close:hover,
.close:focus {
    color: #000;
}

.modal-body {
    font-size: 1.1rem;
    line-height: 1.6;
    color: #555;
}

.modal-body a {
    color: #007bff;
    text-decoration: none;
    font-weight: bold;
}

.modal-body a:hover {
    text-decoration: underline;
}

h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: 20px;
}

#dataForm {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-bottom: 20px;
}

#dataForm label {
    margin-right: 5px;
}

#dataForm input[type="date"] {
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#dataForm button {
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
}

#dataForm button:hover {
    background-color: #0056b3;
}

#stats, #prevStats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin: 20px 0;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

#stats p, #prevStats p {
    margin: 0;
    font-weight: bold;
    text-align: center;
}

#stats span {
    color: #007bff;
    font-size: 1.2em;
}

#prevStats span {
    color: #dc3545;
    font-size: 1.2em;
}

#prevStats p:first-child {
    grid-column: 1 / -1;
    text-align: left;
}

.chart-container {
    position: relative;
    width: 100%;
    height: 60vh;
    min-height: 400px;
    max-height: 800px;
    margin: 20px 0;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    #backButton {
        top: 5px;
        right: 5px;
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    #helpButton {
        top: 5px;
        right: 75px;
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .modal-content {
        margin: 20% auto;
        padding: 20px;
        width: 95%;
    }

    .modal-body {
        font-size: 1rem;
    }

    #dataForm {
        flex-direction: column;
        align-items: stretch;
    }

    #dataForm input[type="date"],
    #dataForm button {
        width: 100%;
    }

    #stats, #prevStats {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
        padding: 10px;
    }

    .chart-container {
        height: 50vh;
        min-height: 300px;
    }
}

@media (max-width: 480px) {
    #stats, #prevStats {
        grid-template-columns: 1fr;
    }
}