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

body {
    font-family: 'Georgia', 'Times New Roman', 'STSong', serif;
    line-height: 1.8;
    color: #333;
    padding: 20px;
    background-position: 0 0, 10px 10px;
    /* 信件背景（图片） */
    background: #eeeeee url(../img/bj.png);
    background-attachment: fixed;
    background-repeat: repeat;
    /* 信件背景（马赛克方格） */
    /*background-color: #f0f0f0;*/
    /*background-image:*/
    /*    linear-gradient(45deg, #e0e0e0 25%, transparent 25%, transparent 75%, #e0e0e0 75%),*/
    /*    linear-gradient(45deg, #e0e0e0 25%, transparent 25%, transparent 75%, #e0e0e0 75%);*/
    /*background-size: 20px 20px;*/
}

.letter-container {
    max-width: 850px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 2px;
    margin-bottom: 20px;
    position: relative;
}

/* 语言切换按钮样式 */
.lang-switch-container {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 100;
}

.lang-switch-container img {
    width: 24px;
    height: 24px;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.lang-switch-container img:hover {
    opacity: 1.0;
}

/* 头部导航 */
.nav-tabs {
    display: flex;
    border-bottom: 1px solid #eee;
    margin-bottom: 30px;
}

.nav-tab {
    padding: 15px 20px;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    font-size: 16px;
}

.nav-tab:hover {
    background-color: #f5f5f5;
}

.nav-tab.active {
    border-bottom-color: #333;
    color: #333;
    font-weight: bold;
}

/* 内容区域 */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 信纸纹理效果 */
.letter-container {
    background-image:
        linear-gradient(transparent 29px, #f0f0f0 30px);
    background-size: 100% 30px;
}

/* 通用内容样式 */
.content-section {
    font-size: 16px;
    line-height: 1.8;
}

.content-section h2 {
    margin-bottom: 20px;
    color: #222;
    font-size: 24px;
}

.content-section h3 {
    margin: 25px 0 15px 0;
    color: #444;
    font-size: 18px;
}

.content-section p {
    margin-bottom: 15px;
    text-align: justify;
}

/* 列表样式 */
.content-section ul {
    list-style: none;
    padding-left: 0;
    margin: 15px 0;
}

.content-section li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 20px;
}

.content-section li::before {
    content: "▹";
    color: #999;
    position: absolute;
    left: 0;
    top: 0;
}

/* 联系方式 */
.contact-info {
    margin: 15px 0;
}

.contact-item {
    margin-bottom: 10px;
}

.contact-label {
    font-weight: bold;
    color: #555;
}

/* 网站链接 */
.website-links a {
    display: inline-block;
    margin-right: 20px;
    color: #666;
    text-decoration: none;
    margin-bottom: 10px;
}

.website-links a:hover {
    color: #333;
    text-decoration: underline;
}

/* 工具和游戏网格 */
.tools-grid,
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin: 15px 0;
}

.tool-item,
.game-item {
    padding: 15px;
    border: 1px solid #eee;
    border-radius: 4px;
    background-color: #fafafa;
}

.tool-name,
.game-name {
    font-weight: bold;
    color: #333;
    margin-bottom: 5px;
}

.tool-desc,
.game-desc {
    font-size: 14px;
    color: #666;
}

/* 关于我页面特殊样式 */
.about-me-content {
    text-align: justify;
}

.about-me-content p:first-child {
    font-size: 18px;
    font-style: italic;
    color: #666;
    margin-bottom: 25px;
}

@media (max-width: 768px) {
    .letter-container {
        padding: 20px;
        margin: 10px;
    }

    .nav-tabs {
        flex-wrap: wrap;
    }

    .nav-tab {
        padding: 10px 15px;
        font-size: 14px;
    }

    .tools-grid,
    .games-grid {
        grid-template-columns: 1fr;
    }

    /* 移动端调整语言按钮位置 */
    .lang-switch-container {
        top: 5px;
        right: 5px;
    }
}

/* 信纸底部页脚描述 */
.letter-footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #999;
    font-size: 14px;
}

/* 底部版权信息 - 在信纸外部 */
#footer-wrap {
    max-width: 850px;
    margin: 0 auto 20px auto;
    text-align: center;
    padding: 20px;
    color: #999;
    font-size: 12px;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 2px;
    background-image:
        linear-gradient(transparent 29px, #f0f0f0 30px);
    background-size: 100% 30px;
    border-top: 1px solid #eee;
}

#footer-wrap a {
    color: #666;
    text-decoration: none;
}

#footer-wrap a:hover {
    color: #333;
    text-decoration: underline;
}

#footer-wrap img {
    width: 50px;
    vertical-align: middle;
    margin-left: 5px;
}

/* 今日诗词样式 */
#jinrishici-sentence {
    position: absolute;
    top: 111px;
    right: 40px;
    font-size: 14px;
    font-style: italic;
    color: #666;
    text-align: right;
    max-width: 300px;
}

/* 网站统计样式 */
.webinfo {
    display: flex;
    justify-content: center;
    gap: 30px;
    font-size: 12px;
    color: #999;
    margin-top: 10px;
}

.webinfo-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

@media (max-width: 768px) {
    #jinrishici-sentence {
        position: static;
        text-align: center;
        max-width: 100%;
        margin-bottom: 20px;
        padding: 10px;
        font-size: 13px;
    }

    .webinfo {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 15px;
    }
}