/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 主要内容区域 */
.main-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

/* 播放器区域 */
.player-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.url-input-section {
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.url-input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.url-input:focus {
    outline: none;
    border-color: #667eea;
}

.load-btn {
    padding: 12px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.load-btn:hover {
    transform: translateY(-2px);
}


/* 视频容器 */
.video-container {
    position: relative;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 15px;
}

#videoPlayer {
    width: 100%;
    height: 400px;
    display: block;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 400px;
    color: #6c757d;
    background: #f8f9fa;
}

.placeholder i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.placeholder p {
    font-size: 1.2rem;
}

/* 播放控制 */
.player-controls {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 10px;
}

.control-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: #667eea;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.control-btn:hover {
    background: #5a6fd8;
    transform: scale(1.1);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.volume-slider {
    width: 100px;
    height: 5px;
    background: #ddd;
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    appearance: none;
    width: 15px;
    height: 15px;
    background: #667eea;
    border-radius: 50%;
    cursor: pointer;
}

.time-display {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #495057;
    min-width: 120px;
}

.progress-container {
    width: 100%;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.progress-bar::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    background: #667eea;
    border-radius: 50%;
    cursor: pointer;
}

/* 播放列表区域 */
.playlist-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    height: fit-content;
}

.playlist-section h3 {
    margin-bottom: 20px;
    color: #495057;
    display: flex;
    align-items: center;
    gap: 10px;
}

.playlist-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.btn {
    padding: 10px 15px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.playlist {
    list-style: none;
    max-height: 400px;
    overflow-y: auto;
}

.playlist-item {
    padding: 12px;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.playlist-item:hover {
    background: #f8f9fa;
    border-color: #667eea;
}

.playlist-item.active {
    background: #e3f2fd;
    border-color: #2196f3;
}

.playlist-item.empty {
    text-align: center;
    color: #6c757d;
    cursor: default;
}

.playlist-item.empty:hover {
    background: transparent;
    border-color: #e9ecef;
}

.playlist-item i {
    color: #667eea;
}

.playlist-item-title {
    flex: 1;
    font-weight: 500;
}

.playlist-item-url {
    font-size: 12px;
    color: #6c757d;
    word-break: break-all;
}

.playlist-item-actions {
    display: flex;
    gap: 5px;
}

.playlist-item-actions button {
    width: 25px;
    height: 25px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.playlist-item-actions .play-btn {
    background: #28a745;
    color: white;
}

.playlist-item-actions .delete-btn {
    background: #dc3545;
    color: white;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: #495057;
}

.close-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #6c757d;
}

.close-btn:hover {
    color: #495057;
}

.modal-body {
    padding: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #495057;
}

.form-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 14px;
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid #e9ecef;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* 页脚样式 */
.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    margin-top: 30px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .control-group {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .volume-control {
        order: 3;
        width: 100%;
    }
    
    .volume-slider {
        width: 100%;
    }
    
    .playlist-controls {
        flex-direction: column;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 错误提示 */
.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    margin-top: 10px;
    border: 1px solid #f5c6cb;
}

/* 成功提示 */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: 10px;
    border-radius: 4px;
    margin-top: 10px;
    border: 1px solid #c3e6cb;
}