/* medium 主题：Medium 风格极简阅读
   白底窄栏 + 大字号正文 + 衬线标题、去卡片化列表、少边框多留白；
   深色模式自动切换。CSS 变量与 data-mode/data-accent 约定与 default 主题一致
   （main.js 明暗/配色/说说折叠等交互通用）。 */

:root {
  --bg: #ffffff;            /* Medium 纯白背景 */
  --fg: #242424;            /* 深灰正文 */
  --muted: #757575;
  --accent: #1a8917;        /* Medium 绿：对 --bg(#FFFFFF) 实测 4.66:1，链接文本达标 */
  --accent-2: #0f7a0d;
  --border: #e6e6e6;
  --primary: #1f1f1f;
  --code-bg: #f7f7f7;
  --content-width: 720px;
  --card-bg: #ffffff;
  --shadow: none;           /* 去卡片阴影：平面极简 */
  --radius: 0px;
  --heat-1: #e8f5e9; --heat-2: #a5d6a7; --heat-3: #66bb6a; --heat-4: #2e7d32;
}

html[data-mode="dark"] {
  --bg: #0f0f10;
  --fg: #e7e7e7;
  --muted: #9a9a9a;
  --accent: #3da33a;
  --accent-2: #5cb85c;
  --border: #262626;
  --primary: #f5f5f5;
  --code-bg: #181818;
  --card-bg: #141414;
  --shadow: none;
  --heat-1: #1b3b1a; --heat-2: #2e6b2c; --heat-3: #3da33a; --heat-4: #7fd17c;
}

@media (prefers-color-scheme: dark) {
  html[data-mode="auto"] {
    --bg: #0f0f10;
    --fg: #e7e7e7;
    --muted: #9a9a9a;
    --accent: #3da33a;
    --accent-2: #5cb85c;
    --border: #262626;
    --primary: #f5f5f5;
    --code-bg: #181818;
    --card-bg: #141414;
    --shadow: none;
    --heat-1: #1b3b1a; --heat-2: #2e6b2c; --heat-3: #3da33a; --heat-4: #7fd17c;
  }
}

/* ---------- 内置配色（html[data-accent] 覆盖 --accent；green（Medium 绿）为默认） ---------- */
html[data-accent="indigo"] { --accent: #1a8917; --accent-2: #0f7a0d;
  --heat-1: #e8f5e9; --heat-2: #a5d6a7; --heat-3: #66bb6a; --heat-4: #2e7d32; }
html[data-accent="blue"]   { --accent: #2563eb; --accent-2: #06b6d4;
  --heat-1: #dbeafe; --heat-2: #60a5fa; --heat-3: #2563eb; --heat-4: #1e3a8a; }
html[data-accent="green"]  { --accent: #059669; --accent-2: #84cc16;
  --heat-1: #d1fae5; --heat-2: #34d399; --heat-3: #059669; --heat-4: #064e3b; }
html[data-accent="purple"] { --accent: #7c3aed; --accent-2: #ec4899;
  --heat-1: #ede9fe; --heat-2: #a78bfa; --heat-3: #7c3aed; --heat-4: #4c1d95; }
html[data-accent="orange"] { --accent: #ea580c; --accent-2: #f59e0b;
  --heat-1: #ffedd5; --heat-2: #fb923c; --heat-3: #ea580c; --heat-4: #7c2d12; }
html[data-mode="dark"][data-accent="indigo"] { --accent: #3da33a; --accent-2: #5cb85c; }
html[data-mode="dark"][data-accent="blue"]   { --accent: #60a5fa; --accent-2: #22d3ee; }
html[data-mode="dark"][data-accent="green"]  { --accent: #34d399; --accent-2: #a3e635; }
html[data-mode="dark"][data-accent="purple"] { --accent: #a78bfa; --accent-2: #f472b6; }
html[data-mode="dark"][data-accent="orange"] { --accent: #fb923c; --accent-2: #fbbf24; }
@media (prefers-color-scheme: dark) {
  html[data-mode="auto"][data-accent="indigo"] { --accent: #3da33a; --accent-2: #5cb85c; }
  html[data-mode="auto"][data-accent="blue"]   { --accent: #60a5fa; --accent-2: #22d3ee; }
  html[data-mode="auto"][data-accent="green"]  { --accent: #34d399; --accent-2: #a3e635; }
  html[data-mode="auto"][data-accent="purple"] { --accent: #a78bfa; --accent-2: #f472b6; }
  html[data-mode="auto"][data-accent="orange"] { --accent: #fb923c; --accent-2: #fbbf24; }
}

/* ---------- 基础 ---------- */
body {
  background: var(--bg);
  color: var(--fg);
  font: 16.5px/1.85 -apple-system, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  margin: 0;
  transition: background .3s, color .3s;
  -webkit-font-smoothing: antialiased;
}
button, a, [role="button"], label { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
::selection { background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* ---------- 主题配色选择器 ---------- */
.accent-wrap { position: relative; display: flex; align-items: center; }
.accent-panel { position: absolute; right: 0; top: calc(100% + .6rem); z-index: 50;
  display: flex; gap: .5rem; padding: .6rem .7rem;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow); }
.accent-panel[hidden] { display: none; }
.accent-swatch { width: 24px; height: 24px; border-radius: 50%; padding: 0;
  border: 2px solid var(--card-bg); box-shadow: 0 0 0 1px var(--border); cursor: pointer;
  transition: transform .15s ease; }
.accent-swatch:hover { transform: scale(1.15); }
.accent-swatch.current { box-shadow: 0 0 0 2px var(--card-bg), 0 0 0 4px var(--fg); }
.accent-swatch[data-accent="indigo"] { background: #1a8917; }
.accent-swatch[data-accent="blue"]   { background: #2563eb; }
.accent-swatch[data-accent="green"]  { background: #059669; }
.accent-swatch[data-accent="purple"] { background: #7c3aed; }
.accent-swatch[data-accent="orange"] { background: #ea580c; }

/* ---------- 布局 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0;
}
.site-header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  position: relative;
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
  white-space: nowrap;
}
.site-logo { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; }
.site-nav { display: flex; align-items: center; gap: .2rem; margin-left: auto; }
.site-nav a {
  display: inline-block;
  padding: .38rem .8rem;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: .92rem;
  transition: color .15s ease, background .15s ease;
}
.site-nav a:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.nav-dropdown { position: relative; }
.nav-dropdown > a::after { content: "▾"; margin-left: .2rem; font-size: .7em; opacity: .7; }
.nav-dropdown .dropdown-menu { display: none; position: absolute; top: 100%; left: .2rem;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: .35rem 0; min-width: 150px; flex-direction: column;
  box-shadow: var(--shadow); z-index: 10; }
@media (min-width: 769px) {
  .nav-dropdown:hover .dropdown-menu, .nav-dropdown:focus-within .dropdown-menu { display: flex; }
}
.dropdown-menu a { padding: .45rem 1rem; border-radius: 0; color: var(--fg); font-size: .88rem; }
.dropdown-menu a:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); color: var(--accent); }
.theme-toggle, .nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: none;
  border-radius: 12px;
  background: none;
  color: var(--muted);
  transition: color .15s ease, background .15s ease;
}
.theme-toggle:hover, .nav-toggle:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.nav-toggle { display: none; }

.site-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.25rem 1.5rem 4rem;
}

.site-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.6rem 1.5rem 3.5rem;
  color: var(--muted);
  font-size: .88rem;
  text-align: center;
}
.footer-friends { display: flex; flex-wrap: wrap; justify-content: center; gap: .4rem 1rem; margin-bottom: 1rem; }
.footer-friends-label { opacity: .8; }
.footer-friend { color: var(--muted); text-decoration: none; }
.footer-friend:hover { color: var(--accent); }
.site-desc { margin: 0 0 1rem; }
.footer-copy { margin: 0; }

/* ---------- 两栏布局：正文居中，右侧栏 fixed 悬浮（不占内容宽度） ---------- */
.layout-two-col { display: block; position: relative; }
.layout-main { max-width: var(--content-width); margin: 0 auto; }
.layout-side { position: fixed; top: 5.5rem;
  right: max(1rem, calc((100vw - var(--content-width)) / 2 - 300px));
  width: 200px; display: flex; flex-direction: column; gap: 1.75rem;
  max-height: calc(100vh - 7rem); overflow-y: auto; }
.side-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}
.side-title {
  margin: 0 0 .6rem;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.side-toc, .side-months { list-style: none; margin: 0; padding: 0; }
.side-toc li, .side-months li { margin: .25rem 0; }
.side-toc a, .side-months a { color: var(--muted); text-decoration: none; font-size: .88rem; line-height: 1.5; }
.side-toc a:hover, .side-months a:hover { color: var(--accent); }
.side-toc .toc-l2 { padding-left: .8rem; }
.side-toc .toc-l3 { padding-left: 1.6rem; }
.side-month-active { color: var(--accent) !important; font-weight: 600; }
.side-tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.archive-more { margin-top: .5rem; border: none; background: none; color: var(--muted); font-size: .82rem; }
.archive-more:hover { color: var(--accent); }

/* ---------- 章节标题 ---------- */
.section-title {
  font-family: Georgia, "Songti SC", "SimSun", serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin: 1.8rem 0 1rem;
  display: flex;
  align-items: baseline;
  gap: .6rem;
}
/* 区块标题右侧排序切换（首页最新文章） */
.section-sort { display: inline-flex; align-items: baseline; gap: .45rem; margin-left: auto; font-size: .8rem; font-weight: 400; font-family: inherit; }
.section-sort a { color: var(--muted); text-decoration: none; padding: .12rem .65rem; border: 1px solid var(--border); border-radius: 999px; transition: color .15s, border-color .15s, background .15s; }
.section-sort a:hover { color: var(--accent); border-color: var(--accent); }
.section-sort a.active { color: var(--accent); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.section-title small { font-family: inherit; font-size: .8rem; font-weight: 400; color: var(--muted); }
.more-link { margin: 1.2rem 0 0; font-size: .9rem; }
.more-link a { color: var(--accent); text-decoration: none; }
.more-link a:hover { text-decoration: underline; }

/* ---------- 热力图（发布日历，占满容器宽度，与 default 主题一致） ---------- */
.heatmap-section { margin-bottom: 1rem; }
.heatmap { display: flex; gap: 3px; padding-bottom: 4px; }
.heatmap-col { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.heat-cell {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 2px;
  background: var(--border);
  cursor: default;
}
.heat-cell.l0 { background: var(--border); }
.heat-cell.l1 { background: var(--heat-1); }
.heat-cell.l2 { background: var(--heat-2); }
.heat-cell.l3 { background: var(--heat-3); }
.heat-cell.l4 { background: var(--heat-4); }
.heat-tooltip { position: fixed; z-index: 100; pointer-events: none;
  background: var(--fg); color: var(--bg); font-size: .72rem; line-height: 1.5;
  padding: .45rem .75rem; border-radius: 6px; white-space: pre-line;
  min-width: 180px; max-width: 280px; box-shadow: 0 4px 12px rgba(0,0,0,.18); }
/* 图例色块保持原样小尺寸（热力图格子占满，图例不拉伸） */
.heat-legend .heat-cell { width: 10px; height: 10px; flex: none; }
.heat-legend { display: flex; align-items: center; gap: 4px; margin-top: 8px; font-size: .75rem; color: var(--muted); }

/* ---------- 说说时间线 ---------- */
.moment-timeline { position: relative; margin: 1rem 0 0; }
.moment-item { display: flex; gap: .9rem; margin-bottom: .9rem; }
.moment-dot {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: .62em;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}
.moment-body { flex: 1; min-width: 0; }
.moment-head { display: flex; align-items: baseline; gap: .7rem; }
.moment-toggle {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  flex: 1;
  min-width: 0;
  padding: 0;
  border: none;
  background: none;
  color: var(--fg);
  font: inherit;
  font-size: .95rem;
  text-align: left;
}
.moment-time { flex: none; font-size: .78rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.moment-preview { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--fg); }
.moment-arrow { flex: none; color: var(--muted); font-size: .8em; transition: transform .2s ease; }
.moment-toggle[aria-expanded="true"] .moment-arrow { transform: rotate(90deg); }
.moment-full { display: none; margin-top: .6rem; }
.moment-body.expanded .moment-full { display: block; }
.moment-body.expanded .moment-preview { display: none; }
.moment-content { font-size: .98rem; line-height: 1.85; }
.moment-content p { margin: .4em 0; }
.moment-thumbs { display: flex; gap: 6px; margin-top: .55rem; }
/* 展开时隐藏顶部裁剪缩略图（展开态有完整宫格） */
.moment-body.expanded .moment-thumbs { display: none; }
/* 内容短的说说：直接显示全文、隐藏折叠按钮与缩略图 */
.moment-item.moment-short .moment-thumbs { display: none; }
.moment-item.moment-short .moment-full { display: block; }
.moment-thumb { width: 72px; height: 72px; border-radius: 10px; object-fit: cover; border: 1px solid var(--border); }
.moment-thumb-video { display: inline-flex; align-items: center; justify-content: center; background: var(--code-bg); color: var(--muted); }
.moment-thumb-more {
  width: 72px; height: 72px; border-radius: 10px;
  display: inline-flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent); font-size: .9rem;
}
.moment-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: .6rem; }
.moment-grid.single { grid-template-columns: 1fr; max-width: 420px; }
.moment-grid.many { grid-template-columns: repeat(4, 1fr); }
.moment-media { display: block; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); color: inherit; text-decoration: none; }
.moment-media img, .moment-media video { display: block; width: 100%; height: 100%; object-fit: cover; aspect-ratio: 1 / 1; background: var(--code-bg); }
.moment-grid.single .moment-media img { aspect-ratio: auto; max-height: 480px; }
.moment-file {
  display: flex; flex-direction: column; gap: .2rem;
  padding: .8rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  color: var(--fg);
  text-decoration: none;
  font-size: .88rem;
}
.moment-file-name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.moment-file-size { font-size: .78rem; color: var(--muted); }
.month-filter-note { font-size: .9rem; color: var(--muted); }

/* ---------- 文章列表（Medium 式分隔线列表，无卡片） ---------- */
.post-list { margin: 0; }
.post-list-item {
  padding: 1.7rem 0;
  border-bottom: 1px solid var(--border);
  transition: none;
}
.post-list-item:last-of-type { border-bottom: none; }
.post-list-item:hover { transform: none; border-color: var(--border); box-shadow: none; }
.post-list-item h2 { margin: 0 0 .4rem; font-family: Georgia, "Songti SC", "SimSun", serif; font-size: 1.45rem; line-height: 1.4; font-weight: 600; }
.post-list-item h2 a { color: var(--fg); text-decoration: none; }
.post-list-item h2 a:hover { color: var(--accent); }
.meta { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem 1rem; font-size: .82rem; color: var(--muted); }
/* 文章详情页 meta：时间 / 分类专栏标签 / 统计 各占一行 */
.post-header .meta { flex-direction: column; align-items: flex-start; gap: .35rem; }
.post-header .meta-line { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem 1rem; }
.meta a { color: var(--muted); text-decoration: none; }
.meta a:hover { color: var(--accent); }
.excerpt { margin: .7rem 0 0; font-size: .94rem; color: var(--muted); line-height: 1.75; }

/* ---------- 点赞 ---------- */
.like-icon {
  width: 1.05em;
  height: 1.05em;
  flex-shrink: 0;
}
.like-toggle,
.moment-like-toggle {
  display: inline-flex;
  align-items: center;
  gap: .3em;
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  font: inherit;
  font-size: .875rem;
  line-height: 1;
  cursor: pointer;
  transition: color 200ms ease;
  align-self: center;
}
.like-toggle:hover,
.like-toggle[aria-pressed="true"],
.moment-like-toggle:hover,
.moment-like-toggle[aria-pressed="true"] {
  color: var(--accent);
}
.like-count {
  color: inherit;
}
/* 文章列表 meta 中的点赞（静态展示，不可点击） */
.post-like-count {
  display: inline-flex;
  align-items: center;
  gap: .3em;
  color: var(--muted);
}

.post-tags { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: .85rem; }
.tag-link {
  display: inline-block;
  padding: .12rem .65rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent);
  font-size: .78rem;
  text-decoration: none;
  transition: background .15s ease;
}
.tag-link:hover { background: color-mix(in srgb, var(--accent) 18%, transparent); }

/* ---------- 标签云 ---------- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag-badge {
  display: inline-block;
  padding: .28rem .9rem;
  border-radius: 999px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: .84rem;
  text-decoration: none;
  transition: bottom .2s ease, color .15s ease, border-color .15s ease, background .15s ease;
}
.tag-badge:hover { color: var(--accent); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.tag-current { color: var(--accent); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.archive-title { font-family: Georgia, "Songti SC", "SimSun", serif; font-size: 1.6rem; font-weight: 600; margin: 0 0 1.2rem; }
.archive-clear { font-size: .82rem; color: var(--accent); text-decoration: none; }

/* ---------- 分页 ---------- */
.pagination { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.4rem; font-size: .9rem; }
.page-prev, .page-next { color: var(--accent); text-decoration: none; padding: .35rem .9rem; border: 1px solid var(--border); border-radius: 999px; transition: background .15s ease, color .15s ease; }
.page-prev:hover, .page-next:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--accent); }
.page-info { color: var(--muted); }

/* ---------- 文章页 ---------- */
.post {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
}
.post-header { margin-bottom: 2rem; padding-bottom: 1.6rem; border-bottom: 1px solid var(--border); }
.post-header h1 { font-family: Georgia, "Songti SC", "SimSun", serif; font-size: 2.5rem; font-weight: 600; line-height: 1.3; margin: 0 0 .9rem; letter-spacing: -0.015em; }
.post-adjacent { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .6rem; margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid var(--border); font-size: .9rem; }
.post-adjacent a { color: var(--accent); text-decoration: none; }
.post-adjacent a:hover { text-decoration: underline; }
.adjacent-prev, .adjacent-next { max-width: 46%; }
.adjacent-next { text-align: right; }

/* ---------- 正文（md-body） ---------- */
.md-body { font-size: 1.15rem; line-height: 1.85; color: var(--fg); }
.md-body h1, .md-body h2, .md-body h3, .md-body h4, .md-body h5, .md-body h6 {
  font-family: Georgia, "Songti SC", "SimSun", serif;
  font-weight: 600;
  line-height: 1.4;
  margin: 1.8em 0 .6em;
  color: var(--fg);
}
.md-body h1 { font-size: 1.7em; }
.md-body h2 { font-size: 1.45em; padding-bottom: .3em; border-bottom: 1px solid var(--border); }
.md-body h3 { font-size: 1.25em; }
.md-body h4 { font-size: 1.1em; }
.md-body p { margin: .9em 0; }
.md-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.md-body a:hover { border-bottom-color: var(--accent); }
.md-body ul, .md-body ol { padding-left: 1.6em; margin: .9em 0; }
.md-body li { margin: .35em 0; }
.md-body blockquote {
  margin: 1.2em 0;
  padding: .3em 1.2em;
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  color: var(--muted);
}
.md-body code {
  padding: .15em .4em;
  border-radius: 6px;
  background: color-mix(in srgb, var(--fg) 8%, transparent);
  color: var(--accent);
  font-size: .88em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.md-body pre {
  margin: 1.2em 0;
  padding: 1rem 1.2rem;
  border-radius: 12px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  overflow-x: auto;
  position: relative;
}
.md-body pre code { background: none; padding: 0; color: var(--fg); font-size: .88rem; line-height: 1.7; }
.md-body pre .code-copy { position: absolute; top: .5rem; right: .5rem;
  font: inherit; font-size: .75rem; padding: .2rem .6rem; cursor: pointer;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--muted);
  opacity: 0; transition: opacity .15s ease; }
.md-body pre:hover .code-copy { opacity: 1; }
.md-body pre .code-copy:hover { color: var(--accent); border-color: var(--accent); }
.md-body pre .code-copy:focus-visible { opacity: 1; outline: 2px solid var(--accent); }
.md-body pre .code-copy.copied { color: var(--accent); border-color: var(--accent); }
@media (prefers-reduced-motion: reduce) { .md-body pre .code-copy { transition: none; } }
.md-body pre::before {
  content: attr(data-lang);
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--muted);
  opacity: .7;
}
.md-body img { max-width: 100%; border-radius: 12px; }
.md-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.md-body table { border-collapse: collapse; margin: 1.2em 0; width: 100%; font-size: .95em; }
.md-body th, .md-body td { border: 1px solid var(--border); padding: .5rem .9rem; text-align: left; }
.md-body th { background: color-mix(in srgb, var(--fg) 5%, transparent); font-weight: 600; }
.md-body video { max-width: 100%; border-radius: 12px; }
.highlight-wrap { position: relative; }

/* ---------- 说说页 / 归档/分类/搜索/错误 ---------- */
.page { background: none; border: none; border-radius: 0; padding: 0; box-shadow: none; }
.page h1 { font-family: Georgia, "Songti SC", "SimSun", serif; font-size: 2rem; margin: 0 0 1.4rem; }
.category-tags { margin: 0 0 1.4rem; }
.search-page { background: none; border: none; border-radius: 0; padding: 0; box-shadow: none; }
.search-form { display: flex; gap: .6rem; margin-bottom: 1.2rem; }
.search-form input {
  flex: 1;
  padding: .6rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg);
  font-size: .95rem;
}
.search-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.search-form button {
  padding: .6rem 1.4rem;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: .92rem;
  transition: filter .15s ease;
}
.search-form button:hover { filter: brightness(1.1); }
.search-result-info { font-size: .9rem; color: var(--muted); }
.search-page .post-list-item { box-shadow: none; }
.error-page { text-align: center; padding: 4rem 1rem; }
.error-code { font-family: Georgia, serif; font-size: 5rem; font-weight: 700; margin: 0; background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.error-message { color: var(--muted); margin: .6rem 0 1.6rem; }
.error-page a { color: var(--accent); text-decoration: none; }

/* ---------- 悬浮联系方式卡片 ---------- */
.contact-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 12.5rem;
  z-index: 60;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--fg);
  box-shadow: var(--shadow);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color .15s ease, transform .15s ease;
}
.contact-fab:hover { color: var(--accent); transform: translateY(-2px); }
.contact-fab[hidden] { display: none; }
.contact-panel { position: fixed; right: 1.25rem; bottom: 13.4rem; z-index: 61;
  width: 264px; max-width: calc(100vw - 2.5rem);
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 18px;
  box-shadow: var(--shadow); padding: 1.1rem 1.2rem;
  display: flex; flex-direction: column; gap: .6rem; }
.contact-panel[hidden] { display: none; }
.contact-title { margin: 0; font-size: .95rem; font-weight: 600; }
.contact-socials { display: flex; flex-wrap: wrap; gap: .4rem; }
.contact-item { display: inline-flex; align-items: center; gap: .4rem;
  color: var(--fg); text-decoration: none; font-size: .875rem;
  padding: .2rem .4rem; border-radius: 6px;
  max-width: 100%; overflow-wrap: anywhere; }
.contact-item:hover { color: var(--accent); }
.contact-item svg { flex: none; }
.contact-item-qr { position: relative; }
.contact-qr-pop {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%);
  display: none;
  z-index: 70;
  padding: 6px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.contact-item-qr:hover .contact-qr-pop,
.contact-item-qr:focus-within .contact-qr-pop { display: block; }
.contact-logo-img { width: 200px; height: 200px; object-fit: contain; border-radius: 8px; display: block; }

/* ---------- 回到顶部 ---------- */
.back-top { position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 60;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--card-bg); color: var(--fg); cursor: pointer; padding: 0;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow); transition: color .15s ease, transform .15s ease; }
.back-top[hidden] { display: none; }
.back-top:hover { color: var(--accent); transform: translateY(-2px); }

/* ---------- 灯箱（图片点击放大） ---------- */
.lightbox { position: fixed; inset: 0; z-index: 100;
  background: rgba(0, 0, 0, .78); display: flex; align-items: center; justify-content: center;
  padding: 2rem; }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 100%; max-height: 100%; border-radius: 10px; box-shadow: 0 20px 60px rgba(0, 0, 0, .5); }

/* ---------- 空态 / 通用 ---------- */
.empty { color: var(--muted); font-size: .95rem; padding: 1rem 0; }
.archive-clear { margin-left: .5rem; }

/* ---------- 响应式 ---------- */
@media (max-width: 1280px) {
  .layout-side { display: none; }
  .post { padding: 1.8rem 1.4rem; }
  .page, .search-page { padding: 1.6rem 1.4rem; }
}
@media (max-width: 768px) {
  .site-header-inner { padding: .8rem 1rem; gap: .8rem; }
  .site-nav {
    /* 注意：.site-header 的 backdrop-filter 会成为 fixed 后代的包含块，
       不能依赖 top:0/bottom:0 拉伸，需显式高度（100dvh + 100vh 兜底） */
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    height: 100dvh;
    width: 240px;
    box-sizing: border-box;
    background: var(--card-bg);
    border-left: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 4.2rem 1rem 1.5rem;
    gap: .2rem;
    transform: translateX(100%);
    transition: transform .25s ease;
    box-shadow: -8px 0 30px rgba(0, 0, 0, .1);
    z-index: 55;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .site-nav.open { transform: translateX(0); }
  .site-nav a { padding: .7rem 1rem; font-size: 1rem; border-radius: 10px; }
  .nav-toggle { display: inline-flex; }
  /* 移动端下拉改手风琴：默认收起，点父项展开 */
  .nav-dropdown > a {
    display: flex;
    align-items: center;
    gap: .4rem;
  }
  .nav-dropdown > a::after {
    content: "▾";
    margin-left: auto;
    font-size: .8em;
    opacity: .7;
    transition: transform .2s ease;
  }
  .nav-dropdown.open > a::after { transform: rotate(180deg); }
  .nav-dropdown .dropdown-menu {
    position: static;
    display: none;
    border: none;
    box-shadow: none;
    padding: .25rem 0 .25rem 0;
    min-width: 0;
  }
  .nav-dropdown.open .dropdown-menu { display: flex; }
  /* 子链接与主链接同风格（整行圆角），左侧缩进区分层级 */
  .nav-dropdown .dropdown-menu a {
    padding: .55rem 1rem .55rem 1.6rem;
    font-size: .92rem;
    border-radius: 10px;
    color: var(--muted);
  }
  .moment-grid { grid-template-columns: repeat(3, 1fr); }
  .post-header h1 { font-size: 1.6rem; }
}
@media (max-width: 480px) {
  .site-main { padding: 1.5rem 1rem 3rem; }
  .moment-thumb { width: 60px; height: 60px; }
  .moment-thumb-more { width: 60px; height: 60px; }
}

/* ---------- 列表页排序切换（与 default 主题一致） ---------- */
.sort-bar { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap;
  font-size: .875rem; color: var(--muted); margin: .2rem 0 1rem; }
.sort-link { color: var(--muted); text-decoration: none; padding: .15rem .55rem;
  border-radius: 999px; border: 1px solid var(--border); transition: all .2s; }
.sort-link:hover { color: var(--accent); border-color: var(--accent); }
.sort-link.active { color: var(--bg); background: var(--accent); border-color: var(--accent); }

/* ---------- 专栏卡片总览页（与 default 主题一致） ---------- */
.column-list { display: flex; flex-direction: column; gap: 1.5rem; margin-top: .5rem; }
.column-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  background: var(--card-bg);
}
.column-card-head { border-bottom: 1px solid var(--border); padding-bottom: .75rem; margin-bottom: .9rem; }
.column-card-name { margin: 0 0 .35rem; font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; }
.column-card-name a { color: var(--fg); text-decoration: none; transition: color 200ms ease; }
.column-card-name a:hover { color: var(--accent); }
.column-card-desc { margin: 0; color: var(--muted); font-size: .9rem; line-height: 1.6; }
.column-card-posts { list-style: none; margin: 0 0 .6rem; padding: 0; display: flex; flex-direction: column; gap: .45rem; }
.column-card-posts li { padding-left: 1rem; position: relative; }
.column-card-posts li::before { content: ""; position: absolute; left: 0; top: .55em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.column-card-posts a { color: var(--fg); text-decoration: none; transition: color 200ms ease; }
.column-card-posts a:hover { color: var(--accent); }
.column-more { color: var(--accent); text-decoration: none; font-size: .9rem; }
.column-more:hover { text-decoration: underline; }
.column-card-count { font-weight: 400; color: var(--muted); font-size: .8rem; margin-left: .6rem; }
.archive-count { font-weight: 400; color: var(--muted); font-size: .85rem; margin-left: .5rem; }
.archive-title .archive-cat { color: var(--accent); }

/* ---------- 侧栏：专栏列表导航（与 default 主题一致） ---------- */
.side-columns { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .45rem; }
.side-columns li { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.side-columns a { color: var(--muted); text-decoration: none; font-size: .9rem; line-height: 1.5; }
.side-columns a:hover { color: var(--accent); }
.side-columns .side-column-active a { color: var(--accent); font-weight: 600; }
.side-column-count { color: var(--muted); font-size: .78rem; flex-shrink: 0; }

/* ---- 轨迹地图：全屏控件与全屏态 ---- */
.leaflet-control-fullscreen {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: #333;
  cursor: pointer;
  border: none;
}
.leaflet-control-fullscreen:hover { color: #000; }
.trails-map:fullscreen, .trail-map:fullscreen { width: 100vw; height: 100vh; }

/* ---- 轨迹总览：详情卡片与列表选中态 ---- */
.trail-detail-card {
  margin-top: 1rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}
.trail-detail-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.trail-detail-name { margin: 0; font-size: 1.1rem; }
.trail-detail-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 6px;
}
.trail-detail-close:hover { color: var(--accent); }
.trail-detail-stats { margin-top: .4rem; color: var(--muted); font-size: .9rem; }
.trail-detail-desc { margin: .6rem 0 0; color: var(--muted); font-size: .9rem; line-height: 1.6; }
.trail-detail-link { display: inline-block; margin-top: .6rem; color: var(--accent); text-decoration: none; font-size: .9rem; }
.trail-detail-link:hover { text-decoration: underline; }
.trail-card.selected { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.trail-detail-title { min-width: 0; }
.trail-detail-date { display: block; margin-top: .15rem; font-size: .85rem; color: var(--muted); }

/* ---- 轨迹总览：搜索与排序 ---- */
.trail-filter-row { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; margin: 1rem 0 .75rem; }
.trail-search { flex: 1 1 220px; min-width: 0; font: inherit; font-size: .9rem; padding: .45rem .8rem; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg); color: var(--fg); }
.trail-search:focus { outline: none; border-color: var(--accent); }
.trail-sort-bar { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; font-size: .875rem; color: var(--muted); margin: 0; }
.trail-sort-btn { font: inherit; font-size: .85rem; padding: .15rem .65rem; border-radius: 999px; border: 1px solid var(--border); background: transparent; color: var(--muted); cursor: pointer; transition: all .2s; }
.trail-sort-btn:hover { color: var(--accent); border-color: var(--accent); }
.trail-sort-btn.active { color: var(--accent); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }

/* ---- 轨迹总览：列表（固定高滚动）+ 地图 + 右侧标准侧栏数字卡片 ---- */
.trail-list-panel { max-height: 320px; overflow-y: auto; margin-bottom: 1rem; }
.layout-side .trail-detail-card { margin-top: 0; max-height: calc(100vh - 8.5rem); overflow-y: auto; }
.layout-side .trail-stats { grid-template-columns: repeat(2, 1fr); gap: .6rem .75rem; margin-top: .9rem; }
.layout-side .trail-stat { border: none; background: none; padding: .3rem .4rem; border-radius: 0; }
.layout-side .trail-stat-value { font-size: 1rem; }
.layout-side .trail-stat-label { font-size: .7rem; }

/* ===== 徒步轨迹 ===== */
.trails-map-wrap { margin: 1.25rem 0 1.5rem; }
.trails-map {
  height: 400px;
  width: 100%;
  position: relative;
  z-index: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: #e7e5e0;
}
.trail-date { color: var(--muted); font-size: .9rem; margin: .3rem 0 1rem; }
.trail-desc { color: var(--muted); line-height: 1.7; margin: 0 0 1rem; }
.trail-card-list { display: flex; flex-direction: column; gap: .85rem; margin-top: 1rem; }
.trail-card {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1rem 1.15rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--fg);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}
.trail-card:hover { border-color: var(--accent); box-shadow: 0 6px 20px rgba(0, 0, 0, .08); }
.trail-card-head { display: flex; align-items: baseline; justify-content: space-between; gap: .8rem; flex-wrap: wrap; }
.trail-card-name { font-weight: 700; font-size: 1.05rem; color: var(--fg); transition: color 200ms ease; }
.trail-card:hover .trail-card-name { color: var(--accent); }
.trail-card-meta { display: flex; gap: .5rem; flex-wrap: wrap; }
.trail-badge { font-size: .78rem; color: var(--muted); background: color-mix(in srgb, var(--fg) 7%, transparent); padding: .15rem .55rem; border-radius: 999px; }
.trail-card-desc { color: var(--muted); font-size: .875rem; line-height: 1.6; }
.trail-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: .85rem;
  margin: 1.25rem 0 0;
}
.trail-stat {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.trail-stat-value { font-size: 1.2rem; font-weight: 700; color: var(--accent); }
.trail-stat-label { font-size: .78rem; color: var(--muted); }

/* 阅读模式：隐藏站点导航/侧栏/页脚，正文限宽居中 */
.reading-mode .site-header,
.reading-mode .layout-side,
.reading-mode .site-footer { display: none !important; }
.reading-mode .layout-two-col { display: block; }
.reading-mode .layout-main { max-width: 46rem; margin-left: auto; margin-right: auto; padding-left: 1.5rem; padding-right: 1.5rem; }
.reading-mode .post,
.reading-mode .page { font-size: 1.0625rem; line-height: 1.85; }
.reading-mode .post-adjacent { display: none; }
@media (max-width: 768px) {
  .reading-mode .layout-main { padding-left: .75rem; padding-right: .75rem; }
}

/* 阅读模式悬浮图标按钮：右下角圆形（与 back-top 同风格），仅文章/独立页存在 */
.reading-float {
  position: fixed;
  right: 1.25rem;
  bottom: 5rem; /* 悬浮组收起时紧贴主按钮上方 */
  z-index: 60;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .14);
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.reading-float:hover { color: var(--accent); border-color: var(--accent); }
.reading-float::after {
  content: "阅读模式";
  position: absolute;
  right: calc(100% + .6rem);
  top: 50%;
  transform: translateY(-50%) translateX(4px);
  padding: .3rem .6rem;
  border-radius: 6px;
  background: var(--fg);
  color: var(--bg);
  font-size: .75rem;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .15);
  transition: opacity .15s ease, transform .15s ease;
}
.reading-float:hover::after { opacity: 1; visibility: visible; transform: translateY(-50%) translateX(0); }
.reading-mode .reading-float::after { content: "退出阅读"; }

.reading-float:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.reading-float-icon { width: 20px; height: 20px; }
.reading-float .icon-reading-off { display: none; }
.reading-mode .reading-float {
  color: var(--accent);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.reading-mode .reading-float .icon-reading-on { display: none; }
.reading-mode .reading-float .icon-reading-off { display: block; }

/* ---------- 顶部搜索框（与其他主题同布局，颜色随本主题） ---------- */
.site-search { display: flex; align-items: center; position: relative; margin-bottom: 1.6rem; }
.site-search input {
  flex: 1;
  padding: .5rem 1rem .5rem 2.4rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--fg) 4%, transparent);
  color: var(--fg);
  font-size: .9rem;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.site-search input::placeholder { color: var(--muted); }
.site-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}
.site-search button {
  position: absolute;
  left: .75rem;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  transition: color .15s ease;
}
.site-search button:hover { color: var(--accent); }

/* ---------- 复制全文/摘要（无边框无背景，文字与图标水平排列） ---------- */
.copy-full {
  display: inline-flex;
  align-items: center;
  gap: .35em;
  padding: .2rem .5rem;
  border: none;
  border-radius: 6px;
  background: none;
  color: var(--muted);
  font: inherit;
  font-size: .8rem;
  white-space: nowrap;
  cursor: pointer;
  transition: color .15s ease, transform .15s ease;
}
.copy-full:hover {
  color: var(--accent);
  transform: translateY(-1px);
}
.copy-full:active { transform: scale(.94); }
.copy-full.copied { animation: copy-pop .35s ease; }
@keyframes copy-pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.18); }
  100% { transform: scale(1); }
}
.copy-full-icon { width: 14px; height: 14px; flex: none; }

/* 前台轻提示（复制成功等） */
.site-toast {
  position: fixed;
  left: 50%;
  bottom: 2.5rem;
  transform: translateX(-50%) translateY(12px);
  z-index: 200;
  padding: .5rem 1.1rem;
  border-radius: 999px;
  background: var(--fg);
  color: var(--bg);
  font-size: .85rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .18);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.site-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 阅读模式：隐藏右下角悬浮按钮（仅返回顶部；联系方式卡片保留不隐藏） */
.reading-mode .back-top { display: none !important; }

/* ---------- 标签折叠/展开按钮（与 tag-link 胶囊同风格） ---------- */
.tag-more {
  display: inline-flex;
  align-items: center;
  font: inherit;
  font-size: .72rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  cursor: pointer;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent);
  border: 1px solid transparent;
  transition: background .15s ease;
}
.tag-more:hover { background: color-mix(in srgb, var(--accent) 18%, transparent); }
.post-header .meta .tag-more { align-self: center; }

/* ===== 前台工具悬浮组（与后台一致：主按钮点击展开，含明暗/配色/回顶/联系） ===== */
.front-fab { position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 62; }
.front-fab-main {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: color-mix(in srgb, var(--accent) 82%, #000);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .18);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background .15s ease;
}
.front-fab-main:hover { background: var(--accent); }
.front-fab-main svg { transition: transform .2s cubic-bezier(.4, 0, .2, 1); }
.front-fab.fab-open .front-fab-main svg { transform: rotate(45deg); }
.front-fab-list {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: .55rem;
  margin-bottom: 52px; /* 给主按钮让位 */
}
.front-fab-item {
  transform: translateY(18px) scale(.6);
  opacity: 0;
  pointer-events: none;
  transition: transform .2s cubic-bezier(.4, 0, .2, 1), opacity .15s ease;
}
.front-fab.fab-open .front-fab-item { transform: translateY(0) scale(1); opacity: 1; pointer-events: auto; }
.front-fab.fab-open .front-fab-item:nth-child(1) { transition-delay: .03s; }
.front-fab.fab-open .front-fab-item:nth-child(2) { transition-delay: .06s; }
.front-fab.fab-open .front-fab-item:nth-child(3) { transition-delay: .09s; }
.front-fab.fab-open .front-fab-item:nth-child(4) { transition-delay: .12s; }
.front-fab-btn {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .12);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.front-fab-btn:hover { color: var(--accent); border-color: var(--accent); }
.front-fab-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
/* 隐藏项（未配置联系 / 回顶未到阈值）不占位 */
.front-fab-item:has(.front-fab-btn[hidden]) { display: none; }
/* 配色面板：从组内按钮向左水平弹出（不遮挡组内其它项，与后台悬浮组一致） */
.front-fab .accent-wrap { position: relative; display: flex; }
.front-fab .accent-panel { top: 50%; transform: translateY(-50%); right: calc(100% + .6rem); bottom: auto; left: auto; }
/* 联系面板 / 阅读按钮位置适配折叠后的悬浮组（主钮仅占右下角，可回落） */
.contact-panel { bottom: 6.5rem; }
@media (prefers-reduced-motion: reduce) {
  .front-fab-item, .front-fab-main svg, .front-fab-btn { transition: none; }
}


/* 回到顶部独立按钮（不入组）：默认位于悬浮组主按钮上方，组展开时由脚本向上让位 */
#back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 90px;
  z-index: 61;
  transition: bottom .2s ease, color .15s ease, border-color .15s ease, background .15s ease;
}
#back-top[hidden] { display: none; }
#contact-panel { z-index: 64; }

/* 折叠时列表隐藏不占位：hover 触发区域即主按钮（展开时再显示） */
.front-fab-list.hidden { display: none; }