body {
    font-family: 'Roboto', sans-serif;
    background-color: #e0e0e0;
    margin: 0;
    padding: 20px;
}
.ui-panel {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    margin: auto;
    max-width: 600px;
}
.ui-button {
    background: linear-gradient(to right, #4facfe 0%,#00f2fe 100%);
    border: none;
    color: white;
    padding: 15px 30px;
    text-align: center;
    text-decoration: none;
    display: block;
    width: 100%;
    box-sizing: border-box;
    margin: 10px 0;
    cursor: pointer;
    border-radius: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    font-size: 16px;
    transition: background 0.3s, box-shadow 0.3s;
}
.ui-button:hover {
    background: linear-gradient(to right, #00f2fe 0%,#4facfe 100%);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
}
.ui-title {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}
.color-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    margin-bottom: 20px;
}
.color-button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid #fff;
    margin: 5px;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: transform 0.3s;
}
.color-button:hover {
    transform: scale(1.1);
}
.input-color {
    display: flex;
    align-items: center;
    margin: 20px 0;
}
.input-color input {
    flex-grow: 1;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
    margin-right: 10px;
}
.slider-container {
    margin: 20px 0;
}
.mqtt-topic-settings {
    display: grid;
    gap: 8px;
    margin: 20px 0;
    padding: 16px;
    border: 1px solid #dbeafe;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.65);
}
.mqtt-topic-settings h2 {
    margin: 0 0 4px;
    font-size: 1rem;
}
.mqtt-topic-settings input {
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
#topic-status {
    min-height: 1.2em;
    color: #2563eb;
    font-size: 0.9rem;
}
.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 15px;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}
.slider:hover {
    opacity: 1;
}
.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}
.slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}
#video {
    width: 100%; /* 或具體的像素值，例如 300px */
    height: 300px; /* 框框的高度 */
    object-fit: cover; /* 確保視頻內容填滿框框，可能會裁剪部分內容 */
    border: 2px solid #000; /* 可選：加一個邊框 */
    border-radius: 10px; /* 可選：圓角邊框 */
    display: block;
    margin: 0 auto;
}

/* 父容器樣式，提供額外空間 */
.video-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 20px; /* 在視頻上方留空間 */
}