/* 标题 - 变大4倍，上下留空间 */
.header {
    text-align: center;
    margin: 30px 0; /* 上下留空间 */
}

.header h1 {
    color: #e74c3c; /* 红色 */
    font-size: 96px; /* 变大4倍 */
    font-weight: bold;
    text-shadow: 3px 3px 6px rgba(0,0,0,0.3);
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 选择章节标签 - 彩色 */
.selection-label {
    font-weight: bold;
    color: #9b59b6; /* 紫色 */
    font-size: 20px;
    flex: 0 0 auto;
    min-width: 80px;
}

/* 播放模式标签 - 和选择章节一样大 */
.play-mode-row label {
    font-weight: bold;
    color: #9b59b6; /* 紫色，和选择章节一样 */
    font-size: 20px; /* 和选择章节一样大 */
    flex: 0 0 auto;
    min-width: 70px;
}

/* 正在播放章节 - 变大2倍，去掉准备播放 */
.playing-chapter {
    color: #f39c12; /* 橙色 */
    font-size: 44px; /* 变大2倍 */
    font-weight: bold;
    margin-bottom: 0; /* 去掉下边距 */
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

/* 按钮里面的字变大3倍 */
.load-btn {
    background: linear-gradient(45deg, #ff6b6b, #ee5a52);
    color: white;
    border: none;
    padding: 24px 30px;
    font-size: 54px; /* 变大3倍 */
    font-weight: bold;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 60px;
    width: 200px;
    display: block;
    margin: 10px auto 0;
}

.nav-buttons button {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 24px 30px;
    font-size: 48px; /* 变大3倍 */
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
    min-height: 60px;
    flex: 0 0 auto;
}

#playBtn {
    background: linear-gradient(45deg, #4ecdc4, #44a08d);
    color: white;
    border: none;
    padding: 16px 25px;
    font-size: 54px; /* 变大3倍 */
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
    min-height: 60px;
    flex: 0 0 auto;
}

/* 选择框字体 */
.selection-group select,
.play-mode-row select {
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 10px;
    font-size: 16px;
    background: white;
    min-height: 44px;
    color: #2c3e50; /* 深蓝色 */
}

/* 时间显示 - 彩色 */
.time-display {
    color: #1abc9c; /* 青绿色 */
    font-size: 14px;
    font-weight: 500;
    flex: 0 0 auto;
    min-width: 100px;
    text-align: center;
}

/* 进度条颜色 */
.progress-bar {
    position: relative;
    flex: 1;
    height: 8px;
    background: #ecf0f1;
    border-radius: 4px;
    cursor: pointer;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #e67e22, #f39c12); /* 橙黄色渐变 */
    border-radius: 4px;
    width: 0%;
    transition: width 0.1s ease;
}

.progress-handle {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background: #e67e22; /* 橙色 */
    border-radius: 50%;
    cursor: grab;
    left: 0%;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    transition: left 0.1s ease;
}

/* 其他原有样式保持不变... */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    width: 100vw;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 10px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.book-selection {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.selection-row {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.selection-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.now-playing {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    text-align: center;
}

.nav-buttons {
    background: rgba(255, 255, 255, 0.95);
    padding: 15px 20px;
    border-radius: 15px;
    margin-bottom: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    display: flex;
    gap: 30px;
    justify-content: center;
}

.nav-buttons button:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.3);
}

.bottom-controls {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

#playBtn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(78, 205, 196, 0.4);
}

#playBtn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 1;
}

.progress-handle:active {
    cursor: grabbing;
}

.settings {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .container {
        padding: 8px;
    }
    
    .header h1 {
        font-size: 48px; /* 手机端适当缩小 */
    }
    
    .book-selection,
    .now-playing,
    .nav-buttons,
    .bottom-controls,
    .settings {
        padding: 15px;
        margin-bottom: 12px;
    }
    
    .selection-label,
    .play-mode-row label {
        font-size: 18px;
        min-width: 70px;
    }
    
    .playing-chapter {
        font-size: 32px; /* 手机端适当缩小 */
    }
    
    .nav-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-buttons button {
        width: 100%;
        max-width: 200px;
        font-size: 36px; /* 手机端适当缩小 */
    }
    
    .load-btn {
        width: 180px;
        padding: 20px 25px;
        font-size: 36px; /* 手机端适当缩小 */
    }
    
    #playBtn {
        padding: 14px 18px;
        font-size: 36px; /* 手机端适当缩小 */
        min-height: 55px;
    }
    
    .progress-container {
        gap: 10px;
    }
    
    .time-display {
        font-size: 12px;
        min-width: 80px;
    }
}