body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f7f6;
    color: #333;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.simulator-container {
    background-color: #fff;
    padding: 25px 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 650px;
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 25px;
}

h2 {
    color: #34495e;
    border-bottom: 2px solid #_primary_color_accent; /* Using a placeholder, will define _primary_color_accent later */
    padding-bottom: 8px;
    margin-top: 20px;
    margin-bottom: 15px;
}
/* Define _primary_color_accent - let's pick a teal/blue */
/* For now, let's use a placeholder value that can be easily found and replaced or defined. */
/* Let's assume _primary_color_accent is #00796b (a teal shade) */
h2 {
    color: #34495e;
    border-bottom: 2px solid #00796b; 
    padding-bottom: 8px;
    margin-top: 20px;
    margin-bottom: 15px;
}


.costs-section, .options-section {
    margin-bottom: 20px;
}

.costs-list .cost-item {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    padding: 8px;
    background-color: #ecf0f1;
    border-radius: 5px;
}

.cost-item input[type="number"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    margin-right: 10px;
    font-size: 1em;
}

.remove-item-btn, .add-item-btn {
    padding: 8px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s ease;
}

.add-item-btn {
    background-color: #3498db; /* Blue */
    color: white;
    display: block;
    margin-top: 10px;
}

.add-item-btn:hover {
    background-color: #2980b9;
}

.remove-item-btn {
    background-color: #e74c3c; /* Red */
    color: white;
}

.remove-item-btn:hover {
    background-color: #c0392b;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 1em;
}

#calculate-total-btn {
    background-color: #2ecc71; /* Green */
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    font-size: 1.1em;
    cursor: pointer;
    display: block;
    width: 100%;
    margin-top: 20px;
    margin-bottom: 20px;
    transition: background-color 0.2s ease;
}

#calculate-total-btn:hover {
    background-color: #27ae60;
}

#results-area {
    margin-top: 25px;
    padding: 20px;
    background-color: #e8f6f3; /* Light green background */
    border: 1px solid #d0e9e1;
    border-radius: 8px;
}

#results-area h2 {
    margin-top: 0;
    color: #16a085; /* Darker green */
    border-bottom-color: #16a085;
}

#results-area p {
    font-size: 1.1em;
    margin: 10px 0;
    color: #333;
}

#results-area .total-highlight {
    font-weight: bold;
    font-size: 1.3em;
}

#results-area #total-cost-result {
    color: #c0392b; /* Prominent color for the total */
}

.hidden {
    display: none;
}