/* ─────────────────────────────────────────────────────────────
   茶话会 · Blog 文章排版（复用 style.css 的 :root 变量）
   ───────────────────────────────────────────────────────────── */

/* ── 左侧栏（文章目录）─────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 248px;
  z-index: 50;
  overflow-y: auto;
  background: rgba(255, 250, 242, 0.92);
  border-right: 1px solid var(--line);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.sidebar__inner { padding: 28px 20px 40px; }
.sidebar__brand {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  margin-bottom: 4px;
}
.sidebar__brand:hover { color: var(--bird-deep); }
.sidebar__home {
  display: inline-block;
  font-size: 0.84rem;
  color: var(--muted);
  margin-bottom: 22px;
}
.sidebar__home:hover { color: var(--tea); }
.sidebar__heading {
  font-family: var(--font-head);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--tea);
  margin: 0 0 10px;
}
.sidebar__list { list-style: none; margin: 0; padding: 0; }
.sidebar__group + .sidebar__group { margin-top: 24px; }
.sidebar__link {
  display: block;
  padding: 9px 12px;
  margin-bottom: 4px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--ink);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.sidebar__link:hover { background: rgba(127, 181, 201, 0.1); color: var(--bird-deep); }
.sidebar__link.is-current {
  background: rgba(127, 181, 201, 0.16);
  border-left-color: var(--bird);
  color: var(--bird-deep);
  font-weight: 600;
}

/* 汉堡按钮（手机抽屉用，桌面隐藏）*/
.sidebar-toggle {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 60;
  width: 44px;
  height: 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
.sidebar-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.22s ease, opacity 0.22s ease;
}
body.sidebar-open .sidebar-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.sidebar-open .sidebar-toggle span:nth-child(2) { opacity: 0; }
body.sidebar-open .sidebar-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-overlay {
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(60, 48, 36, 0.4);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.sidebar-overlay.is-visible { opacity: 1; }

/* 桌面：侧栏常驻，内容右移让位，汉堡 / 遮罩隐藏 */
@media (min-width: 900px) {
  body.has-sidebar { padding-left: 248px; }
  .sidebar-toggle { display: none; }
  .sidebar-overlay { display: none !important; }
  /* 博客桌面版放宽正文（主页无 .has-sidebar，仍是 760px）*/
  body.has-sidebar .page { max-width: 960px; }
}

/* 手机：侧栏收成抽屉，默认藏在屏幕左外侧 */
@media (max-width: 899px) {
  .sidebar {
    width: min(82vw, 300px);
    transform: translateX(-100%);
    transition: transform 0.26s ease;
  }
  .sidebar.is-open { transform: none; box-shadow: 0 0 40px -8px rgba(60, 48, 36, 0.45); }
  body.has-sidebar .page { padding-top: 4px; }
}

/* ── 文章卡片容器 ─────────────────────────────────────────────── */
.post {
  margin-top: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px clamp(20px, 5vw, 46px);
  box-shadow: var(--shadow-sm);
}

.post__header {
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.post__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.5vw, 2rem);
  line-height: 1.3;
  margin: 0 0 12px;
  color: var(--ink);
}
.post__meta {
  margin: 0;
  font-size: 0.86rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.post__sep { opacity: 0.5; }

/* 文末页脚：知乎原文沉到左下，© 仍居中 */
.post__footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  text-align: center;
}
.post__footer .post__origin { justify-self: start; text-align: left; }
.post__footer p { grid-column: 2; margin: 0; }
@media (max-width: 560px) {
  .post__footer { grid-template-columns: 1fr; justify-items: center; gap: 6px; }
  .post__footer .post__origin { justify-self: center; text-align: center; }
  .post__footer p { grid-column: 1; }
}

/* ── 正文排版 ─────────────────────────────────────────────────── */
.post__body { font-size: 1rem; line-height: 1.85; color: var(--ink); }
.post__body > *:first-child { margin-top: 0; }

.post__body h2,
.post__body h3,
.post__body h4 {
  font-family: var(--font-head);
  color: var(--ink);
  line-height: 1.35;
  scroll-margin-top: 20px;
}
.post__body h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2.2em 0 0.8em;
  padding-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.post__body h2::after {
  content: "";
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--bird), transparent);
  border-radius: 2px;
}
.post__body h3 { font-size: 1.16rem; font-weight: 600; margin: 1.8em 0 0.6em; }
.post__body h4 { font-size: 1.02rem; font-weight: 600; margin: 1.5em 0 0.5em; color: var(--bird-deep); }

.post__body p { margin: 0 0 1.1em; overflow-wrap: break-word; }

.post__body a { color: var(--bird-deep); border-bottom: 1px solid rgba(127, 181, 201, 0.4); }
.post__body a:hover { color: var(--tea); border-bottom-color: var(--tea); }

.post__body ul,
.post__body ol { margin: 0 0 1.1em; padding-left: 1.5em; }
.post__body li { margin: 0.35em 0; }
.post__body li > ul,
.post__body li > ol { margin: 0.35em 0; }

.post__body blockquote {
  margin: 1.3em 0;
  padding: 6px 18px;
  color: var(--muted);
  background: rgba(127, 181, 201, 0.08);
  border-left: 3px solid var(--bird);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.post__body blockquote p { margin: 0.5em 0; }

.post__body hr {
  border: none;
  height: 1px;
  background: var(--line);
  margin: 2em 0;
}

/* 行内代码 / 代码块 */
.post__body code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.88em;
  background: rgba(195, 157, 114, 0.14);
  border: 1px solid rgba(195, 157, 114, 0.28);
  border-radius: 6px;
  padding: 1px 6px;
}
.post__body pre {
  margin: 1.3em 0;
  padding: 16px 18px;
  overflow-x: auto;
  background: #2f2a25;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}
.post__body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #f3e9d8;
  font-size: 0.86rem;
  line-height: 1.6;
}

/* ── 图片 / figure ────────────────────────────────────────────── */
.post__body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.4em auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}
.post__body figure { margin: 1.6em 0; }
.post__body figure img { margin: 0 auto 0.6em; }
.post__body figcaption {
  text-align: center;
  font-family: var(--font-head);
  font-size: 0.84rem;
  color: var(--muted);
}

/* ── 数学公式（MathJax 运行时）─────────────────────────────────── */
.math-display {
  margin: 1.4em 0;
  overflow-x: auto;   /* 长公式移动端可横向滚动 */
  overflow-y: hidden;
  text-align: center;
}
mjx-container[display="true"] { margin: 0 !important; }
mjx-container { max-width: 100%; }

/* ── 文末上一篇 / 下一篇 ───────────────────────────────────────── */
.post-nav-bottom {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.post-nav-link:hover { transform: translateY(-3px); border-color: var(--bird); box-shadow: var(--shadow); }
.post-nav-link--next { text-align: right; }
.post-nav-link__label { font-size: 0.74rem; color: var(--muted); letter-spacing: 0.04em; }
.post-nav-link__title { font-family: var(--font-head); font-weight: 600; font-size: 0.95rem; color: var(--ink); }

/* ── 列表页卡片：日期 + 摘要 ──────────────────────────────────── */
.card__date {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 10px;
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--tea);
  background: rgba(195, 157, 114, 0.16);
  border: 1px solid rgba(195, 157, 114, 0.36);
  border-radius: 999px;
  white-space: nowrap;
  vertical-align: middle;
}
.card a.card__titlelink { color: var(--ink); }
.card a.card__titlelink:hover { color: var(--bird-deep); }

/* 整张卡片可点：标题链接铺满卡片（.card 已是 position: relative） */
.card--link { cursor: pointer; }
.card--link .card__titlelink::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
}
.card--link:hover .card__titlelink { color: var(--bird-deep); }

/* ── 响应式 ───────────────────────────────────────────────────── */
@media (max-width: 560px) {
  .post { padding: 26px 18px; }
  .post-nav-bottom { grid-template-columns: 1fr; }
  .post-nav-link--next { text-align: left; }
}