:root {
    --primary-color: #007bff;
    --bg-color: #121212;
    --panel-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --led-red: #ff0000;
    --led-bg: #000000;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 1000px;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 5px;
}

.subtitle {
    color: #888;
    font-size: 0.9rem;
}

main {
    background-color: var(--panel-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* 视频容器样式 */
.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #000;
}

#factory-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* LED 跑马灯样式 */
.led-overlay {
    position: absolute;
    top: 15%; /* 模拟 LED 挂在工厂墙上或设备上方的位置 */
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 60px;
    background-color: var(--led-bg);
    border: 4px solid #333;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(255, 0, 0, 0.2), inset 0 0 10px rgba(255, 0, 0, 0.5);
    z-index: 10;
}

/* 模拟 LED 点阵质感 */
.led-overlay::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle, rgba(0,0,0,0) 1px, rgba(0,0,0,0.8) 1px);
    background-size: 3px 3px;
    z-index: 2;
    pointer-events: none;
}

.led-screen {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    position: relative;
}

.led-content {
    white-space: nowrap;
    position: absolute;
    color: var(--led-red);
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
    font-size: 32px;
    text-transform: uppercase;
    text-shadow: 0 0 10px var(--led-red);
    animation: marquee 15s linear infinite;
}

@keyframes marquee {
    from { transform: translateX(100%); }
    to { transform: translateX(-100%); }
}

/* 倒计时覆盖层 */
.countdown-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20;
    transition: opacity 0.3s;
}

.hidden {
    display: none;
    opacity: 0;
}

.countdown-box {
    text-align: center;
    background: #252525;
    padding: 30px;
    border-radius: 10px;
    border: 1px solid #444;
}

.timer {
    font-size: 4rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 10px 0;
}

.progress-bar {
    width: 200px;
    height: 6px;
    background-color: #444;
    border-radius: 3px;
    overflow: hidden;
    margin: 20px auto 0;
}

.progress-inner {
    height: 100%;
    width: 100%;
    background-color: var(--primary-color);
    transition: width 1s linear;
}

/* 控制面板样式 */
.control-panel {
    padding: 30px;
}

.input-group {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

#user-input {
    flex: 1;
    padding: 12px 20px;
    border-radius: 8px;
    border: 1px solid #444;
    background-color: #2a2a2a;
    color: #fff;
    font-size: 1rem;
    outline: none;
}

#user-input:focus {
    border-color: var(--primary-color);
}

#send-btn {
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color 0.2s;
}

#send-btn:hover {
    background-color: #0056b3;
}

#send-btn:disabled {
    background-color: #444;
    cursor: not-allowed;
}

.tips {
    color: #888;
    font-size: 0.85rem;
}

footer {
    text-align: center;
    margin-top: 20px;
    color: #555;
    font-size: 0.8rem;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .container {
        width: 100%;
        padding: 10px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .video-container {
        border-radius: 8px;
    }

    .led-overlay {
        width: 80%;
        height: 40px;
        top: 10%;
        border-width: 2px;
    }

    .led-content {
        font-size: 20px;
    }

    .control-panel {
        padding: 20px 15px;
    }

    .input-group {
        flex-direction: column;
        gap: 10px;
    }

    #user-input {
        width: 100%;
        font-size: 16px; /* 防止 iOS 自动放大 */
    }

    #send-btn {
        width: 100%;
        padding: 14px;
    }

    .timer {
        font-size: 3rem;
    }

    .countdown-box {
        width: 90%;
        padding: 20px;
    }
}