body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px; /* 少し狭くして画面を広く使う */
    background-color: #f0f2f5;
    margin: 0;
}

h1 {
    color: #333;
}

.control-panel {
    display: flex;
    flex-wrap: wrap;
    justify-content: center; /* 中央揃えに */
    gap: 20px;
    margin-bottom: 20px;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

fieldset {
    border: 1px solid #ccc;
    border-radius: 4px;
}

.zoom-control {
    display: flex;
    align-items: center;
    gap: 5px;
}
.zoom-control input {
    width: 50px;
    text-align: right;
    border: 1px solid #ccc;
    border-radius: 3px;
    padding: 2px 5px;
}
.zoom-control input::-webkit-outer-spin-button,
.zoom-control input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.zoom-control button {
    width: 30px;
    height: 30px;
    font-size: 16px;
    cursor: pointer;
}

#map-wrapper {
    display: grid;
    place-items: center;
    margin-top: 20px;
    /* 【修正1】ズームの基点を上端中央に変更 */
    transform-origin: top center;
    transition: transform 0.2s ease-in-out;
}

#mapContainer,
#hotspotOverlayContainer {
    grid-area: 1 / 1 / 2 / 2;
    display: grid;
}

#mapContainer {
    border: 2px solid #555;
    background-color: #2c2c2c;
    text-align: center;
    cursor: default;
    /* 【追加】レスポンシブ対応のため、中身に合わせた幅にする */
    width: max-content; 
    height: max-content;
}

#hotspotOverlayContainer {
    pointer-events: none;
    width: max-content;
    height: max-content;
}

.highlight-cell::before {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
}

.hotspot-center::before {
    border: 2px solid rgba(224, 102, 255, 0.9);
}
.hotspot-ring1::before {
    border: 1px solid rgba(224, 102, 255, 0.7);
}
.hotspot-ring2::before {
    border: 1px dashed rgba(224, 102, 255, 0.5);
}