* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #1e88e5;
    margin-bottom: 20px;
    font-size: 28px;
}

h2 {
    color: #1e88e5;
    margin: 15px 0;
    font-size: 20px;
}

.input-area {
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    height: 150px;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    resize: vertical;
    font-size: 16px;
}

button {
    background-color: #1e88e5;
    color: white;
    border: none;
    padding: 10px 15px;
    margin-top: 10px;
    margin-right: 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #1565c0;
}

#clear-btn {
    background-color: #e53935;
}

#clear-btn:hover {
    background-color: #c62828;
}

.output-area {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 4px;
    border: 1px solid #eee;
    min-height: 100px;
}

#pinyin-output {
    font-size: 18px;
    line-height: 1.8;
    word-wrap: break-word;
}

.pinyin-item {
    display: inline-block;
    margin-right: 5px;
    margin-bottom: 5px;
    position: relative;
}

.hanzi {
    font-weight: bold;
    color: #333;
}

.pinyin {
    color: #1e88e5;
    font-size: 14px;
}

.speak-btn {
    background: none;
    border: none;
    color: #1e88e5;
    cursor: pointer;
    font-size: 14px;
    padding: 2px 5px;
    margin-left: 2px;
    border-radius: 3px;
    transition: all 0.2s;
}

.speak-btn:hover {
    background-color: #e3f2fd;
}

.speak-all-btn {
    background-color: #1e88e5;
    color: white;
    border: none;
    padding: 8px 12px;
    margin-top: 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
    display: inline-flex;
    align-items: center;
}

.speak-all-btn:hover {
    background-color: #1565c0;
}

.speak-icon {
    margin-right: 4px;
}

.usage-guide {
    margin-top: 30px;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 4px;
    border: 1px solid #eee;
}

.usage-guide h2 {
    color: #1e88e5;
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 8px;
}

.usage-guide ol {
    padding-left: 20px;
    margin-bottom: 15px;
}

.usage-guide li {
    margin-bottom: 10px;
}

.usage-guide ul {
    padding-left: 20px;
    margin-top: 5px;
}

.usage-guide ul li {
    margin-bottom: 5px;
}

.tip {
    background-color: #e3f2fd;
    padding: 10px;
    border-left: 4px solid #1e88e5;
    margin-top: 15px;
    border-radius: 0 4px 4px 0;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: #777;
    font-size: 14px;
}

@media (max-width: 600px) {
    .container {
        margin: 20px 10px;
        padding: 15px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    textarea {
        height: 120px;
    }
}