body {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 50px auto;
    padding: 0 20px;
    text-align: center;
}
h1 {
    color: #333;
}
#bac-display {
    font-size: 48px;
    margin: 20px;
}
#status {
    font-size: 24px;
    padding: 10px;
    margin: 20px;
    border-radius: 5px;
}
.below { background-color: #e8f4f8; color: #1e88e5; }
.optimal { background-color: #e8f5e9; color: #43a047; }
.above { background-color: #ffebee; color: #e53935; }
button {
    font-size: 20px;
    padding: 10px 20px;
    margin: 5px;
    cursor: pointer;
    border-radius: 5px;
    border: 1px solid #ccc;
    background-color: #f0f0f0;
}
#info {
    margin-top: 30px;
    color: #666;
}
#next-drink {
    margin: 20px;
    padding: 15px;
    background: #f5f5f5;
    border-radius: 5px;
}
.detail {
    margin: 5px;
    font-size: 14px;
    color: #888;
}
#chart-container {
    margin: 30px auto;
    max-width: 100%;
    height: 400px;
    position: relative;
}
#bac-chart {
    width: 100%;
    height: 100%;
}

/* Modal Styles */
.modal {
    display: none; /* Hidden by default */
    position: fixed; 
    z-index: 1; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.4); 
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto; 
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 400px;
    border-radius: 10px;
    text-align: left;
}

.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close-button:hover,
.close-button:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}