body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #1a1a1a;
    color: #f0f0f0;
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.container {
    display: flex;
    width: 100%;
    height: 100%;
}

.main-content {
    flex: 3;
    display: flex;
    flex-direction: column;
    padding: 20px;
    box-sizing: border-box;
}

.video-container {
    flex: 0 0 auto;
    width: 100%;
    background: #000;
    margin-bottom: 20px;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

video {
    width: 100%;
    max-height: 60vh;
    display: block;
}

#video-info {
    padding: 10px;
    background: #2a2a2a;
}

.controls-area {
    flex: 1;
    display: flex;
    gap: 20px;
    overflow: hidden;
}

.panel {
    flex: 1;
    background: #2a2a2a;
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel h3 {
    margin-top: 0;
    border-bottom: 1px solid #444;
    padding-bottom: 10px;
}

.add-url-container {
    display: flex;
    gap: 5px;
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px solid #333;
}

#external-url-input {
    flex: 2;
    padding: 6px;
    background: #333;
    border: 1px solid #444;
    color: white;
    border-radius: 4px;
}

#external-name-input {
    flex: 1;
    padding: 6px;
    background: #333;
    border: 1px solid #444;
    color: white;
    border-radius: 4px;
}

#add-url-btn {
    padding: 6px 10px;
    background: #007acc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.list-group {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex: 1;
}

/* 播放提示覆盖层 */
.play-overlay {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.6);
    z-index: 20;
}

.overlay-content {
    text-align: center;
    color: #fff;
    padding: 18px;
    border-radius: 8px;
}

.overlay-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 8px;
}

.overlay-desc {
    font-size: 13px;
    color: #ddd;
    margin-bottom: 12px;
}

.overlay-play-btn {
    padding: 8px 14px;
    background: #007acc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.overlay-play-btn:hover {
    background: #0062a3;
}

.list-group li {
    padding: 8px 12px;
    background: #333;
    margin-bottom: 5px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.list-group li:hover {
    background: #444;
}

.list-group li button {
    background: #007acc;
    color: white;
    border: none;
    padding: 4px 8px;
    border-radius: 3px;
    cursor: pointer;
}

/* Sidebar Chat */
.sidebar {
    flex: 1;
    min-width: 300px;
    background: #222;
    border-left: 1px solid #333;
    display: flex;
    flex-direction: column;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-header {
    padding: 15px;
    background: #2a2a2a;
    font-weight: bold;
    border-bottom: 1px solid #333;
}

.chat-messages {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message {
    padding: 8px 12px;
    background: #333;
    border-radius: 8px;
    max-width: 85%;
    word-wrap: break-word;
}

.message .user {
    font-weight: bold;
    color: #4daafc;
    margin-right: 5px;
    font-size: 0.9em;
}

.chat-input-area {
    padding: 15px;
    background: #2a2a2a;
    display: flex;
    gap: 10px;
}

#username-input {
    width: 60px;
    padding: 8px;
    background: #333;
    border: 1px solid #444;
    color: white;
    border-radius: 4px;
}

#message-input {
    flex: 1;
    padding: 8px;
    background: #333;
    border: 1px solid #444;
    color: white;
    border-radius: 4px;
}

#send-btn {
    padding: 8px 15px;
    background: #007acc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#send-btn:hover {
    background: #0062a3;
}