/* 北窗 — 黑白为主，行距松，首页只列标题和日期 */

:root {
    --ink: #1a1a1a;
    --ink-soft: #555;
    --ink-faint: #999;
    --paper: #ffffff;
    --line: #e6e6e6;
    --measure: 40rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: "Songti SC", "Noto Serif SC", Georgia, serif;
    font-size: 17px;
    line-height: 1.9;
}

a { color: var(--ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 4px; }

.wrap {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* 头部 */
.site-header {
    padding: 3.5rem 0 2rem;
    border-bottom: 1px solid var(--line);
}
.site-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}
.site-title a:hover { text-decoration: none; }
.site-desc {
    margin: 0.5rem 0 0;
    color: var(--ink-faint);
    font-size: 0.9rem;
}
.nav {
    margin-top: 1.2rem;
    font-size: 0.9rem;
    color: var(--ink-soft);
}
.nav a { color: var(--ink-soft); margin-right: 1.2rem; }

/* 文章列表：首页只列标题和日期 */
/* 垂直间距一律用 margin，别覆盖 .wrap 的左右内边距 */
.post-list { list-style: none; margin: 2.5rem auto; }
.post-list li {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    padding: 0.55rem 0;
}
.post-list .ptitle { font-size: 1.05rem; }
.post-list .pdate {
    flex: none;
    color: var(--ink-faint);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

/* 文章页 */
.post {
    margin: 2.5rem auto;
    border-bottom: 1px solid var(--line);
}
.post-title {
    margin: 0 0 0.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.5;
}
.post-meta {
    margin: 0 0 2rem;
    color: var(--ink-faint);
    font-size: 0.85rem;
}
.post-meta a { color: var(--ink-faint); }

.post-body h2, .post-body h3 {
    line-height: 1.6;
    margin: 2.2rem 0 1rem;
}
.post-body p { margin: 0 0 1.4rem; }
.post-body blockquote {
    margin: 1.6rem 0;
    padding: 0.2rem 0 0.2rem 1.2rem;
    border-left: 2px solid var(--line);
    color: var(--ink-soft);
}
.post-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.6rem 0;
}
.post-body code {
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
    font-size: 0.85em;
    background: #f6f6f6;
    padding: 0.1em 0.35em;
    border-radius: 3px;
}
.post-body pre {
    background: #f6f6f6;
    padding: 1rem 1.2rem;
    overflow-x: auto;
    line-height: 1.7;
}
.post-body pre code { background: none; padding: 0; }
.post-body hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }

/* 归档 / 分类页 */
.archive-head {
    margin: 2.5rem auto 0;
    font-size: 1rem;
    color: var(--ink-soft);
}
.page-nav {
    margin: 1.5rem auto 3rem;
    font-size: 0.9rem;
    color: var(--ink-faint);
}
/* 分页：横排，去掉默认序号 */
.page-nav ol, .page-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem;
    margin: 0;
    padding: 0;
}
.page-nav li { margin: 0; }
.page-nav a { color: var(--ink-faint); }
.page-nav .current { color: var(--ink); }

/* 页脚 */
.site-footer {
    padding: 2rem 0 3rem;
    color: var(--ink-faint);
    font-size: 0.85rem;
}

/* 评论 */
.comments { margin: 2rem auto; }
.comments h2 { font-size: 1.1rem; }
.comment-list { list-style: none; padding: 0; }
.comment-list li { margin: 1.2rem 0; }
.comment-meta { color: var(--ink-faint); font-size: 0.85rem; }
.comment-form textarea, .comment-form input {
    width: 100%;
    border: 1px solid var(--line);
    padding: 0.6rem 0.8rem;
    font: inherit;
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
}
.comment-form button {
    border: 1px solid var(--ink);
    background: var(--paper);
    color: var(--ink);
    padding: 0.45rem 1.4rem;
    font: inherit;
    font-size: 0.9rem;
    cursor: pointer;
}
.comment-form button:hover { background: var(--ink); color: var(--paper); }

@media (min-width: 720px) {
    body { font-size: 18px; }
    .site-header { padding-top: 5rem; }
}

/* 导航里的搜索框 */
.search-form { display: inline-block; margin-left: 0.2rem; vertical-align: middle; }
.search-form input[type="search"] {
    border: 1px solid var(--line);
    background: var(--paper);
    color: var(--ink);
    font-family: inherit;
    font-size: 0.82rem;
    line-height: 1.4;
    padding: 0.25rem 0.6rem;
    width: 8.5rem;
    border-radius: 2px;
}
.search-form input[type="search"]::placeholder { color: var(--ink-faint); }
.search-form input[type="search"]:focus { border-color: var(--ink-soft); outline: none; }
.search-form input::-webkit-search-cancel-button { -webkit-appearance: none; }

@media (min-width: 720px) {
    .search-form input[type="search"] { width: 10rem; }
}

/* 搜索无结果 / 空分类 */
.empty { margin: 2.5rem auto; color: var(--ink-soft); }
.empty p { margin: 0 0 0.8rem; }
.empty a { text-decoration: underline; text-underline-offset: 4px; }
/* 评论区空着时的一句话 */
.comments-empty {
    margin: 0 0 2rem;
    color: var(--ink-soft);
    font-size: 0.95rem;
}

/* 暗色：跟随系统偏好（prefers-color-scheme），读者系统是暗色就自动暗 */
@media (prefers-color-scheme: dark) {
    :root {
        --ink: #d6d1c7;
        --ink-soft: #98938a;
        --ink-faint: #6a655d;
        --paper: #17161a;
        --line: #2e2d31;
    }
    .post-body code,
    .post-body pre { background: #232226; }
    .comment-form input,
    .comment-form textarea { caret-color: var(--ink); }
    .search-form input[type="search"] { color-scheme: dark; }
}

/* 文章页：上一篇 / 下一篇 */
.post-nav {
    display: flex;
    gap: 1.5rem;
    padding: 1.4rem 0 1.8rem;
}
.post-nav-item { flex: 1; min-width: 0; }
.post-nav-next { text-align: right; }
.post-nav-label {
    display: block;
    color: var(--ink-faint);
    font-size: 0.8rem;
    margin-bottom: 0.3rem;
}
.post-nav-item a {
    font-size: 0.95rem;
    line-height: 1.6;
}
.post-nav-none { color: var(--ink-faint); font-size: 0.9rem; }
@media (max-width: 480px) {
    .post-nav { gap: 1rem; }
    .post-nav-item a { font-size: 0.9rem; }
}

/* 留言者的小记号：按留言次数挂在名字后面，两档，灰阶不抢戏 */
.comment-badge {
    display: inline-block;
    margin-left: 0.4em;
    padding: 0 0.45em;
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 0.7rem;
    font-style: normal;
    line-height: 1.7;
    vertical-align: 0.05em;
    letter-spacing: 0.03em;
    white-space: nowrap;
}
.badge-familiar { color: var(--ink-faint); }
.badge-friend { color: var(--ink-soft); border-color: var(--ink-soft); }

/* 楼中楼：子回复缩进、左侧一道细线，跟父评论分出层级（威言威语提的） */
.comment-list li.comment-child {
    margin: 0.9rem 0 0.9rem 1.4rem;
    padding-left: 1.1rem;
    border-left: 2px solid var(--line);
}
.comment-list li.comment-child > li.comment { margin: 1rem 0; }
.comment-list li.comment-child .comment-meta { font-size: 0.82rem; }
@media (max-width: 480px) {
    .comment-list li.comment-child { margin-left: 0.7rem; padding-left: 0.7rem; }
}