body {
    background-color: #f0f2f5;
    font-family: 'Malgun Gothic', 'Apple SD Gothic Neo', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: #333;
}

.container {
    width: 600px;
    max-width: 90%;
    background-color: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    font-size: 1.8em;
    color: #0c2f54;
    /* 应用新主题色 */
    margin-bottom: 10px;
}

.instructions {
    color: #6c757d;
    margin-bottom: 30px;
}

#char-prompt {
    font-size: 10em;
    font-weight: bold;
    color: #0c2f54;
    /* 应用新主题色 */
    margin: 20px 0;
    height: 150px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#char-input {
    width: 150px;
    height: 100px;
    font-size: 5em;
    text-align: center;
    border: 2px solid #ced4da;
    border-radius: 8px;
    box-sizing: border-box;
    font-family: 'Malgun Gothic', 'Apple SD Gothic Neo', sans-serif;
    transition: border-color 0.3s, box-shadow 0.3s;
    /* 添加过渡效果 */
}

#char-input:focus {
    outline: none;
    border-color: #0c2f54;
    /* 应用新主题色 */
    box-shadow: 0 0 8px rgba(12, 47, 84, 0.5);
    /* 应用新主题色的辉光效果 */
}

/* 广告占位符样式 */
.ad-placeholder {
    width: 100%;
    height: 90px;
    background-color: #f8f9fa;
    border: 1px dashed #ccc;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #6c757d;
    margin-top: 30px;
    font-size: 0.9em;
}