/* 全局样式 */
:root {
    --primary-color: #ff6b6b;
    --secondary-color: #4ecdc4;
    --accent-color: #ffe66d;
    --text-color: #2d334a;
    --background-color: #f7f9fc;
    --page-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

/* 标题样式 */
header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

h1 {
    font-family: 'Ma Shan Zheng', cursive;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px var(--shadow-color);
}

/* 控制按钮 */
.controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.nav-btn, .play-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.nav-btn {
    background-color: var(--secondary-color);
    color: white;
}

.nav-btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
    box-shadow: none;
}

.play-btn {
    background-color: var(--accent-color);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.nav-btn:hover:not(:disabled), .play-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px var(--shadow-color);
}

.nav-btn:active:not(:disabled), .play-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow-color);
}

/* 故事书样式 */
.storybook {
    background-color: var(--page-background);
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    overflow: hidden;
    position: relative;
    min-height: 600px;
}

.page {
    display: none;
    padding: 30px;
    transition: opacity 0.5s ease;
}

.page.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 插图样式 */
.illustration {
    text-align: center;
    margin-bottom: 20px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.illustration img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* 故事文本样式 */
.story-text {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.story-text p {
    margin-bottom: 15px;
    text-indent: 2em;
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px 0;
    color: #888;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .controls {
        flex-direction: row;
        gap: 10px;
    }
    
    .nav-btn, .play-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
    
    .page {
        padding: 20px;
    }
    
    .story-text {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    .controls {
        flex-wrap: wrap;
    }
    
    .page {
        padding: 15px;
    }
    
    .story-text {
        font-size: 0.95rem;
    }
}

/* 自动翻页动画 */
.auto-turn {
    animation: pageTurn 0.5s ease;
}

@keyframes pageTurn {
    0% { transform: translateX(0); opacity: 1; }
    50% { transform: translateX(-10%); opacity: 0; }
    51% { transform: translateX(10%); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
}

/* 播放按钮状态 */
.play-btn.playing {
    background-color: #ff9f43;
}

/* 音频进度指示器 */
.audio-progress {
    height: 4px;
    background-color: #eee;
    border-radius: 2px;
    margin-top: 10px;
    overflow: hidden;
    display: none;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s linear;
}

.playing .audio-progress {
    display: block;
}