/* 公开博客前台样式：克制、留白、以阅读为中心 */

/* ---------- 顶栏 ---------- */
.blog-header .search-box {
  display: flex; align-items: center; gap: 8px;
  height: 40px; padding: 0 8px 0 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-full);
  background: var(--md-surface-container-low);
  transition: border-color var(--transition), box-shadow var(--transition);
  flex: 0 1 auto; min-width: 0; overflow: hidden;
}
.blog-header .search-box:focus-within { border-color: var(--md-primary); box-shadow: 0 0 0 1px var(--md-primary); }
.blog-header .search-box input {
  border: none; background: none; outline: none;
  width: 160px; min-width: 0; flex: 0 1 auto;
  align-self: stretch;
  font-size: var(--fs-body-m);
  color: var(--md-on-surface);
  transition: width var(--transition);
}
.blog-header .search-box input:focus { width: 240px; }
.blog-header .search-box .ms { color: var(--md-on-surface-variant); font-size: 20px; flex-shrink: 0; }
@media (max-width: 720px) {
  .blog-header .search-box { flex: 0 1 auto; }
  .blog-header .search-box input { width: 72px; }
  .blog-header .search-box input:focus { width: 96px; }
}

/* ---------- 引言 ---------- */
.hero {
  padding: 72px 0 40px;
  max-width: 640px;
}
.hero .hero-sub { margin-top: 12px; font-size: var(--fs-body-l); color: var(--md-on-surface-muted); line-height: 1.8; }

/* ---------- 标签筛选 ---------- */
.tag-filter { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 28px; }

/* ---------- 文章卡片列表 ---------- */
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
  display: block;
  padding: 24px 28px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-lg);
  background: var(--md-surface-container-low);
  color: var(--md-on-surface);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}
.post-card:hover { text-decoration: none; box-shadow: var(--elev-1); border-color: var(--md-outline); transform: translateY(-1px); }
.post-card .pc-title { font-size: var(--fs-title-l); font-weight: 500; line-height: 1.4; margin-bottom: 8px; }
.post-card .pc-summary {
  font-size: var(--fs-body-m);
  color: var(--md-on-surface-muted);
  line-height: 1.8;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}
.post-card .pc-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 6px 16px;
  font-size: var(--fs-body-s);
  color: var(--md-on-surface-muted);
}
.pc-meta .meta-item { display: inline-flex; align-items: center; gap: 5px; }
.pc-meta .ms { font-size: 15px; }
.pc-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }

/* ---------- 文章页 ---------- */
.article { max-width: 760px; margin: 0 auto; padding: 56px 20px 40px; }
.article .art-title { font-size: 2.1rem; font-weight: 600; line-height: 1.3; letter-spacing: -0.3px; margin: 0 0 20px; }
.article .art-meta {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 8px 18px; padding-bottom: 24px;
  border-bottom: 1px solid var(--md-outline-variant);
  margin-bottom: 32px;
  color: var(--md-on-surface-muted); font-size: var(--fs-body-s);
}
.article .art-meta .meta-item { display: inline-flex; align-items: center; gap: 6px; }
.article .art-meta .ms { font-size: 16px; }
.article .art-body { padding-bottom: 40px; border-bottom: 1px solid var(--md-outline-variant); }
/* 标题锚点：跳转时给顶栏留出空间 */
.article .art-body h2, .article .art-body h3 { scroll-margin-top: calc(var(--appbar-h) + 24px); }

/* ---------- 文章目录：桌面右侧栏 ---------- */
.toc-rail {
  position: fixed;
  top: calc(var(--appbar-h) + 40px);
  right: max(24px, calc((100vw - 760px) / 2 - 248px));
  width: 224px;
  max-height: calc(100vh - var(--appbar-h) - 96px);
  overflow-y: auto;
  z-index: 20;
}
.toc-rail .toc-title {
  font-size: var(--fs-label-s); font-weight: 500;
  color: var(--md-on-surface-muted);
  letter-spacing: 0.5px;
  padding: 0 12px 8px;
  border-bottom: 1px solid var(--md-outline-variant);
  margin-bottom: 8px;
}
.toc-item {
  display: flex; align-items: center;
  height: 32px; padding: 0 12px;
  font-size: 0.8125rem; line-height: 1.4;
  color: var(--md-on-surface-muted);
  border-left: 2px solid transparent;
  border-radius: 0 var(--shape-sm) var(--shape-sm) 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}
.toc-item:hover { background: var(--md-state-hover); color: var(--md-on-surface); text-decoration: none; }
.toc-item.active { color: var(--md-primary); border-left-color: var(--md-primary); background: var(--md-primary-container); color: var(--md-on-primary-container); }
.toc-item.l3 { padding-left: 26px; font-size: 0.75rem; }

/* ---------- 文章目录：移动端 FAB + 底部抽屉 ---------- */
.toc-fab {
  position: fixed; right: 20px; bottom: 28px; z-index: 50;
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--md-primary-container); color: var(--md-on-primary-container);
  box-shadow: var(--elev-3);
  display: flex; align-items: center; justify-content: center;
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.toc-fab:hover { box-shadow: 0 6px 12px 4px rgba(0, 0, 0, 0.1); }
.toc-fab:active { transform: scale(0.96); }
.toc-fab[hidden] { display: none; }

.toc-scrim {
  position: fixed; inset: 0; z-index: 54;
  background: var(--md-scrim);
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
}
.toc-scrim.open { opacity: 1; pointer-events: auto; }

.toc-sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 55;
  background: var(--md-surface-container-low);
  border-radius: var(--shape-xl) var(--shape-xl) 0 0;
  box-shadow: var(--elev-3);
  display: flex; flex-direction: column;
  max-height: 72vh;
  padding-bottom: env(safe-area-inset-bottom);
  transform: translateY(105%);
  transition: transform var(--transition);
}
.toc-sheet.open { transform: none; }
.toc-sheet-handle {
  width: 32px; height: 4px;
  border-radius: var(--shape-full);
  background: var(--md-outline-variant);
  margin: 10px auto 4px;
  flex-shrink: 0;
}
.toc-sheet-head {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 16px 10px;
  border-bottom: 1px solid var(--md-outline-variant);
  flex-shrink: 0;
}
.toc-sheet-list {
  overflow-y: auto;
  padding: 8px 12px 12px;
  display: flex; flex-direction: column; gap: 2px;
}
.toc-sheet-list .toc-item { height: 44px; font-size: 0.875rem; border-radius: var(--shape-sm); }
.toc-sheet-list .toc-item.l3 { padding-left: 34px; font-size: 0.8125rem; }

@media (min-width: 1280px) {
  .toc-fab, .toc-scrim, .toc-sheet { display: none !important; }
}
@media (max-width: 1279px) {
  .toc-rail { display: none !important; }
}
.article .art-author {
  display: flex; align-items: center; gap: 16px;
  padding: 24px 0; border-bottom: 1px solid var(--md-outline-variant);
}
.article .art-related { padding-top: 32px; }
.art-related .rel-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 0; color: var(--md-on-surface);
}
.art-related .rel-item:hover { text-decoration: none; color: var(--md-primary); }

/* ---------- 评论区 ---------- */
.art-comments { padding-top: 32px; }
.art-comments .cm-title {
  font-size: var(--fs-title-l); font-weight: 500;
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.cm-form {
  display: flex; flex-direction: column;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-md);
  background: var(--md-surface-container-low);
  padding: 14px 16px;
  margin-bottom: 20px;
}
.cm-input {
  width: 100%;
  min-height: 84px;
  border: none; outline: none; background: transparent;
  resize: vertical;
  font-size: var(--fs-body-m); line-height: 1.7;
  color: var(--md-on-surface);
  padding: 4px 2px;
}
.cm-input::placeholder { color: var(--md-on-surface-variant); opacity: 0.7; }
.cm-list { display: flex; flex-direction: column; gap: 12px; }
.cm-item {
  display: flex; gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-md);
  background: var(--md-surface-container-low);
}
.cm-body { flex: 1; min-width: 0; }
.cm-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.cm-name { font-weight: 500; font-size: var(--fs-body-m); }
.cm-badge-guest { color: var(--md-on-surface-variant); }
.cm-content {
  margin-top: 6px;
  font-size: var(--fs-body-m); line-height: 1.8;
  white-space: pre-wrap; word-break: break-word;
}
.cm-del { width: 32px; height: 32px; }
.cm-empty { text-align: center; color: var(--md-on-surface-muted); padding: 24px 0; font-size: var(--fs-body-s); }
.cm-list .loading-wrap { padding: 24px 0; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 64px;
  padding: 32px 0 40px;
  border-top: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-muted);
  font-size: var(--fs-body-s);
  text-align: center;
}

/* 加载态 */
.loading-wrap { display: flex; justify-content: center; padding: 64px 0; }

/* 管理入口（登录后显示） */
.admin-entry { display: none; }
body.logged-in .admin-entry { display: inline-flex; }