/* 全局样式 */
:root {
    --primary-color: #4a6da7;
    --secondary-color: #f8b400;
    --text-color: #333;
    --background-color: #f9f9f9;
    --accent-color: #e74c3c;
    --light-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition-speed: 0.3s;
}

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

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

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 标题样式 */
.title {
    text-align: center;
    margin: 20px 0;
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px var(--shadow-color);
}

.subtitle {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-color);
    font-size: 1.2rem;
}

/* 故事书样式 */
.storybook {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px var(--shadow-color);
    overflow: hidden;
    position: relative;
    margin-bottom: 40px;
}

/* 页面样式 */
.page {
    display: none;
    padding: 20px;
    transition: opacity var(--transition-speed);
}

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

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

/* 图片样式 */
.story-image {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    box-shadow: 0 5px 15px var(--shadow-color);
}

/* 文本样式 */
.story-text {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
    padding: 0 10px;
}

/* 导航按钮样式 */
.navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
    padding: 0 10px;
}

.nav-button {
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    border-radius: 50px;
    padding: 12px 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    display: flex;
    align-items: center;
    box-shadow: 0 4px 8px var(--shadow-color);
}

.nav-button:hover {
    background-color: #3a5a8f;
    transform: translateY(-2px);
}

.nav-button:active {
    transform: translateY(0);
}

.nav-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

.nav-button i {
    margin: 0 5px;
}

/* 音频控制样式 */
.audio-control {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

.audio-button {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: none;
    border-radius: 50px;
    padding: 12px 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    display: flex;
    align-items: center;
    box-shadow: 0 4px 8px var(--shadow-color);
    margin: 0 10px;
}

.audio-button:hover {
    background-color: #e0a500;
    transform: translateY(-2px);
}

.audio-button:active {
    transform: translateY(0);
}

.audio-button i {
    margin-right: 8px;
}

/* 页码样式 */
.page-number {
    text-align: center;
    font-size: 0.9rem;
    color: #777;
    margin-top: 10px;
}

/* 封面样式 */
.cover {
    text-align: center;
    padding: 40px 20px;
}

.cover-title {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px var(--shadow-color);
}

.cover-subtitle {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 40px;
}

.start-button {
    background-color: var(--accent-color);
    color: var(--light-color);
    border: none;
    border-radius: 50px;
    padding: 15px 40px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    box-shadow: 0 6px 12px rgba(231, 76, 60, 0.3);
    margin-top: 20px;
}

.start-button:hover {
    background-color: #c0392b;
    transform: translateY(-3px);
}

.start-button:active {
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .story-text {
        font-size: 1rem;
    }
    
    .cover-title {
        font-size: 2.5rem;
    }
    
    .cover-subtitle {
        font-size: 1.2rem;
    }
    
    .nav-button, .audio-button {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .start-button {
        padding: 12px 30px;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .story-text {
        font-size: 0.9rem;
        line-height: 1.6;
    }
    
    .cover-title {
        font-size: 2rem;
    }
    
    .cover-subtitle {
        font-size: 1rem;
    }
    
    .nav-button, .audio-button {
        padding: 8px 15px;
        font-size: 0.8rem;
    }
    
    .start-button {
        padding: 10px 25px;
        font-size: 1rem;
    }
}

/* 动画效果 */
@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0px);
    }
}

.float-animation {
    animation: float 3s ease-in-out infinite;
}

/* 页面指示器 */
.page-indicators {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ddd;
    margin: 0 5px;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.indicator.active {
    background-color: var(--primary-color);
}

/* 页面过渡效果 */
.page-transition {
    transition: transform 0.5s ease-in-out, opacity 0.5s ease-in-out;
}

.page-transition.slide-left {
    transform: translateX(-100%);
    opacity: 0;
}

.page-transition.slide-right {
    transform: translateX(100%);
    opacity: 0;
}