/* 加载覆盖层样式 */
.level5-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.level5-loading-content {
    text-align: center;
    color: var(--text-primary);
}

.level5-loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: level5-spin 1s ease-in-out infinite;
    margin: 0 auto 20px;
}

@keyframes level5-spin {
    to { transform: rotate(360deg); }
}

.level5-loading-message {
    font-size: 18px;
    color: var(--text-primary);
    margin: 0;
}

/* 游戏容器样式 */
.level5-game-container {
    max-width: 1200px;
    margin: 50px auto 0;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.01);
    border-radius: var(--border-radius-xl);
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* 游戏屏幕样式 */
.level5-screen {
    display: none;
}

.level5-screen.active {
    display: flex;
    flex-direction: column;
    min-height: 700px;
    justify-content: space-between;
}

/* 统计信息栏 */
.level5-stats-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.01);
    padding: 15px 20px;
    border-radius: var(--border-radius-large);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.level5-level-info h2 {
    margin: 0;
    font-size: 28px;
    color: var(--text-secondary);
    font-weight: 600;
}

.level5-progress-info {
    display: flex;
    gap: 20px;
    font-size: 20px;
    color: var(--text-primary);
    align-items: center;
    justify-content: space-between;
    flex: 1;
}

#score-display, #time-display, #pairs-info {
    font-weight: 500;
}

/* 匹配游戏区域样式 - 单词意思连线 */
.level5-matching-container {
    display: flex;
    position: relative;
    height: 500px;
    margin-bottom: 20px;
    background-color: rgba(255, 255, 255, 0.01);
    padding: 30px;
    border-radius: var(--border-radius-large);
    border: 2px solid var(--border-color);
}

/* 连线画布容器 */
.level5-connection-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

/* 单词列表容器 */
.level5-word-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding-right: 15px;
    overflow-y: auto;
    justify-content: center;
}

/* 意思列表容器 */
.level5-meaning-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding-left: 15px;
    overflow-y: auto;
    justify-content: center;
}

/* 通用项目样式 */
.level5-item {
    background-color: rgba(255, 255, 255, 0.05) !important;
    border: 2px solid var(--border-light) !important;
    border-radius: var(--border-radius) !important;
    padding: 15px 20px !important;
    cursor: pointer !important;
    user-select: none !important;
    transition: all 0.3s ease !important;
    font-size: 18px !important;
    text-align: center !important;
    height: 60px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    word-wrap: break-word !important;
    position: relative !important;
    overflow: hidden !important;
}

/* 单词项目特殊样式 */
.level5-word-item {
    color: var(--primary-color) !important;
    background-color: rgba(255, 255, 255, 0.05) !important;
}

/* 意思项目特殊样式 */
.level5-meaning-item {
    color: var(--text-primary) !important;
    background-color: rgba(255, 255, 255, 0.05) !important;
}

/* 悬停效果 */
.level5-item:not(.matched):hover {
    background-color: rgba(255, 255, 255, 0.1) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2) !important;
    border-color: var(--primary-color) !important;
}

/* 选中状态 */
.level5-word-list > .level5-item.selected, .level5-meaning-list > .level5-item.selected {
    background-color: rgba(76, 175, 80, 0.1) !important;
    border-color: var(--primary-color) !important;
    border-width: 3px !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2) !important;
}

.level5-word-item.selected {
    color: var(--primary-color) !important;
}

.level5-meaning-item.selected {
    color: white !important;
}

/* 匹配成功状态 */
.level5-word-list > .level5-item.matched, .level5-meaning-list > .level5-item.matched {
    cursor: default !important;
    background-color: rgba(46, 204, 113, 0.2) !important;
    color: white !important;
    border-color: #2ecc71 !important;
    border-width: 2px !important;
    transform: none !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.level5-item.matched:hover {
    background-color: rgba(46, 204, 113, 0.2) !important;
    border-color: #2ecc71 !important;
    transform: none !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

/* 单词列表容器和意思列表容器的调整 */
.level5-word-list,
.level5-meaning-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 0 15px;
    overflow-y: auto;
    align-items: stretch;
}

/* 反馈区域样式 */
.level5-feedback-container {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.level5-feedback-container.hidden {
    display: none;
}

.level5-feedback-container.success {
    background-color: rgba(46, 204, 113, 0.2);
    border-color: #2ecc71;
    color: #2ecc71;
}

.level5-feedback-container.error {
    background-color: rgba(231, 76, 60, 0.2);
    border-color: #e74c3c;
    color: #e74c3c;
}

/* 导航按钮区域 */
.level5-navigation-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.01);
    padding: 20px;
    border-radius: var(--border-radius-large);
    border: 1px solid var(--border-color);
}

/* 分页控件样式 */
.level5-pagination-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.level5-page-info {
    font-size: 18px;
    color: var(--text-primary);
    font-weight: 500;
    min-width: 100px;
    text-align: center;
}

.level5-nav-btn {
    padding: 15px 30px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.3s ease;
    min-width: 150px;
}

.level5-nav-btn:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.level5-nav-btn:disabled {
    background-color: #7f8c8d;
    cursor: not-allowed;
    transform: none;
}

#back-to-menu-button {
    background-color: var(--secondary-color);
}

#back-to-menu-button:hover {
    background-color: var(--secondary-dark);
}

/* 顶部返回主菜单按钮样式 */
.level5-back-to-menu-top {
    padding: 8px 15px !important;
    min-width: auto !important;
    font-size: 16px !important;
    margin-left: 20px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .level5-matching-container {
        flex-direction: column;
        height: auto;
        min-height: 600px;
    }
    
    .level5-word-list,
    .level5-meaning-list {
        padding: 0;
        max-height: 300px;
    }
    
    .level5-item {
        font-size: 16px;
        min-height: 50px;
    }
}

@media (max-width: 768px) {
    .level5-game-container {
        padding: 15px;
    }
    
    .level5-stats-display {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .level5-level-info h2 {
        font-size: 24px;
    }
    
    .level5-progress-info {
        flex-direction: column;
        gap: 5px;
        font-size: 18px;
    }
    
    .level5-matching-container {
        padding: 20px;
        min-height: 500px;
    }
    
    .level5-item {
        font-size: 14px;
        min-height: 45px;
        padding: 12px 15px;
    }
    
    .level5-feedback-container {
        font-size: 16px;
        padding: 12px;
    }
    
    .level5-nav-btn {
        width: 100%;
        max-width: 200px;
        padding: 12px 20px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .level5-game-container {
        padding: 10px;
    }
    
    .level5-stats-display {
        padding: 10px;
    }
    
    .level5-level-info h2 {
        font-size: 20px;
    }
    
    .level5-progress-info {
        font-size: 16px;
    }
    
    .level5-matching-container {
        padding: 15px;
        min-height: 400px;
    }
    
    .level5-item {
        font-size: 13px;
        min-height: 40px;
        padding: 10px;
    }
}