/* ===== 基础 ===== */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial;
    background: #fff;
    color: #111;
}

/* ===== 页面布局（关键：不限制1200在这里） ===== */
.page {
    display: flex;
    gap: 60px;
    padding: 40px 60px;
}

/* ===== 左侧目录（不参与1200） ===== */
.toc {
    width: 240px;
    position: sticky;
    top: 40px;
    height: fit-content;
}

.toc-title {
    font-size: 12px;
    color: #999;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.toc a {
    display: block;
    margin: 10px 0;
    font-size: 14px;
    color: #333;
    text-decoration: none;
}

.toc a:hover {
    color: #000;
}

/* ===== ⭐核心：只有 main 是1200 ===== */
.main {
    width: 1200px;   /* ✔️唯一1200 */
}

/* ===== 面包屑（标题上方） ===== */
.breadcrumb {
    font-size: 13px;
    color: #888;
    margin-bottom: 20px;
}

.breadcrumb a {
    color: #888;
    text-decoration: none;
}

/* ===== 标题 ===== */
.title {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 10px 0;
    text-align: center;   /* ⭐标题居中 */
}

/* ===== meta ===== */
.meta {
    font-size: 13px;
    color: #aaa;
    margin-bottom: 40px;
    text-align: center; 
}

/* ===== 内容 ===== */
.content {
    font-size: 16px;
}

/* ===== h2 ===== */
h2 {
    font-size: 22px;
    margin: 50px 0 15px;
}

/* ===== p ===== */
p {
    line-height: 1.9;
    color: #333;
    margin: 0 0 20px;
}

/* ===== ⭐代码（红色极简） ===== */
code {
    display: block;
    padding: 16px;
    margin: 15px 0;

    background: #fafafa;
    border-left: 3px solid #ff4d4f;

    font-family: monospace;
    color: #d60000;

    white-space: pre-wrap;
}

/* ===== 平滑滚动 ===== */
html {
    scroll-behavior: smooth;
}

/* ===== 手机 ===== */
@media (max-width: 900px) {
    .page {
        flex-direction: column;
        padding: 20px;
    }

    .main {
        width: 100%;
    }

    .toc {
        width: 100%;
        position: relative;
    }
}