* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #1a1a1a;
    color: #ffffff;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 5px;
    font-size: 1.8rem;
}

h2 {
    text-align: center;
    margin-bottom: 30px;
    font-weight: normal;
    color: #aaaaaa;
    font-size: 1.2rem;
}

.form-group {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.form-group label {
    min-width: 180px;
    font-weight: bold;
}

.form-group select,
.form-group input {
    flex: 1;
    max-width: 250px;
    padding: 10px;
    font-size: 1rem;
    background-color: #2a2a2a;
    color: #ffffff;
    border: 2px solid #444444;
    border-radius: 5px;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: #888888;
}

button {
    display: block;
    width: 100%;
    max-width: 200px;
    margin: 25px auto;
    padding: 12px 25px;
    font-size: 1.1rem;
    font-weight: bold;
    background-color: #ffffff;
    color: #000000;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #cccccc;
}

button:active {
    background-color: #999999;
}

.info-box {
    background-color: #2a2a2a;
    border: 1px solid #444444;
    border-radius: 5px;
    padding: 15px;
    margin: 20px 0;
    text-align: center;
}

.info-box p {
    margin: 5px 0;
    color: #cccccc;
}

.toggle-container {
    text-align: center;
    margin: 20px 0;
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 1rem;
    color: #ffffff;
}

.toggle-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.toggle-label span {
    user-select: none;
}

#heatmap {
    width: 100%;
    height: 600px;
    margin-top: 20px;
    background-color: #2a2a2a;
    border-radius: 5px;
}