:root {
  --metal-bg:           #eef1f5;
  --metal-bg-soft:      #e4e8ef;
  --metal-bg-card:      #f6f8fb;
  --metal-text:         #2c3640;
  --metal-heading:      #1a2230;
  --metal-meta:         #6b7b8d;
  --metal-accent:       #3a7bd5;
  --metal-accent-2:     #00b4d8;
  --metal-accent-3:     #7c3aed;
  --metal-silver:       #94a3b8;
  --metal-silver-light: #cbd5e1;
  --metal-silver-dark:  #64748b;
  --metal-border:       #d1d9e2;
  --metal-border-strong:#a8b4c0;
  --metal-divider:      #b8c4d0;
  --metal-card-shadow:  rgba(28, 40, 60, 0.06);
  --metal-card-shadow-h:rgba(28, 40, 60, 0.16);
  --metal-glow:         rgba(58, 123, 213, 0.15);
  --metal-glow-strong:  rgba(58, 123, 213, 0.3);
  --metal-sticky-bg:    linear-gradient(135deg, #eaf2ff 0%, #f0f4ff 50%, #eef2ff 100%);
  --metal-sticky-border:#7aa2e0;
  --metal-tag-bg:       rgba(58, 123, 213, 0.08);
  --metal-tag-border:    rgba(58, 123, 213, 0.22);
  --metal-footer-bg:     #1a2230;
  --metal-chip-text:    #3a7bd5;

  /* ── 黑客终端（经典绿字 CRT） ── */
  --hacker-bg:         #0d1117;
  --hacker-bg-elev:    #161b22;
  --hacker-border:     #00ff66;
  --hacker-green:      #00ff66;
  --hacker-green-dim:  #00cc52;
  --hacker-green-glow: rgba(0, 255, 102, 0.4);
  --hacker-green-faint:rgba(0, 255, 102, 0.08);
  --hacker-amber:      #ffb000;
  --hacker-red:        #ff5c5c;

  /* ── 正文选中色（非代码区） ── */
  --selection-bg-body: #b3d4fc;
  --selection-text-body:#1a1a1a;
}

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

body {
  background: var(--metal-bg);
  background-image:
    radial-gradient(circle at 20% 30%, rgba(58,123,213,0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0,180,216,0.03) 0%, transparent 50%);
  color: var(--metal-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--metal-heading); text-decoration: none; transition: color 0.2s, text-shadow 0.2s; }
a:hover { color: var(--metal-accent); text-shadow: 0 0 8px var(--metal-glow); }

/* =====================================================================
   🎯 选中效果（核心修复点）
   ===================================================================== */

/* 1. 默认选中（正文、标题、列表等）—— 舒适的高亮蓝 */
::selection {
  background: var(--selection-bg-body);
  color: var(--selection-text-body);
  text-shadow: none;
}

::-moz-selection {
  background: var(--selection-bg-body);
  color: var(--selection-text-body);
  text-shadow: none;
}

/* 2. 代码块内的选中 —— 强制黑客绿风格 */
/* 必须提高优先级，防止被上面的全局规则覆盖 */
pre::selection,
pre ::selection,
.prompt-box::selection,
.prompt-box ::selection,
code::selection,
.highlight ::selection {
  background: rgba(0, 255, 102, 0.25) !important;
  color: #ffffff !important;
  text-shadow: 0 0 6px rgba(0, 255, 102, 0.6) !important;
}

pre::-moz-selection,
pre ::-moz-selection,
.prompt-box::-moz-selection,
.prompt-box ::-moz-selection,
code::-moz-selection,
.highlight ::-moz-selection {
  background: rgba(0, 255, 102, 0.25) !important;
  color: #ffffff !important;
  text-shadow: 0 0 6px rgba(0, 255, 102, 0.6) !important;
}


.site-header {
  position: sticky;
  top: 0;
  z-index: 9999;
  background: rgba(238, 241, 245, 0.92);
  backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--metal-border);
  box-shadow: 0 2px 16px var(--metal-card-shadow),
              inset 0 -1px 0 rgba(255,255,255,0.5);
}
.header-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 品牌：和 nav-link 同字号同高，hover 才出渐变 */
.site-brand {
  font-size: 1rem;
  font-weight: 600;
  color: var(--metal-heading) !important;
  letter-spacing: 0.02em;
  line-height: 1.5;
  padding: 0.4rem 0.2rem;
  background: none;
  -webkit-background-clip: initial;
  -webkit-text-fill-color: initial;
  background-clip: initial;
  text-shadow: none;
  transition: all 0.2s;
}
.site-brand:hover {
  background: linear-gradient(135deg, var(--metal-accent), var(--metal-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 导航链接 */
.site-nav { display: flex; gap: 0.4rem; align-items: center; }
.nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--metal-text) !important;
  line-height: 1.5;
  display: inline-flex;
  align-items: center;
  position: relative;
  transition: color 0.2s, background 0.2s;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--metal-accent), var(--metal-accent-2));
  transition: width 0.25s, left 0.25s;
}
.nav-link:hover::after,
.nav-link.active::after { width: 70%; left: 15%; }
.nav-link:hover, .nav-link.active {
  color: var(--metal-accent) !important;
  background: rgba(58, 123, 213, 0.06);
}

/* =====================================================================
   📄 主内容区 + 强制居中（覆盖 minima）
   ===================================================================== */
.main-content {
  min-height: calc(100vh - 60px - 100px);
  padding: 2rem 0 4rem;
  display: flex;
  justify-content: center;
  width: 100%;
}
.main-content > * {
  width: 100%;
  max-width: 820px;
}

/* minima 的 wrapper 兜底 */
.page-content { display: block !important; }
.page-content .wrapper {
  max-width: 820px !important;
  margin-left: auto !important;
  margin-right: auto !important;
  padding-left: 20px !important;
  padding-right: 20px !important;
  float: none !important;
}

.home-container,
.post-article {
  margin-left: auto !important;
  margin-right: auto !important;
  float: none !important;
}

.home-container {
  max-width: 820px;
  padding: 0 20px;
}
.post-article {
  max-width: 820px;
  padding: 0 20px;
}

/* =====================================================================
   🏠 区块标题
   ===================================================================== */
.section-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.section-title {
  font-size: 1.35rem; font-weight: 700; color: var(--metal-heading);
  margin: 0; white-space: nowrap; letter-spacing: 0.02em;
}
.section-title::before {
  content: ''; display: inline-block; width: 6px; height: 1.1em;
  background: linear-gradient(180deg, var(--metal-accent), var(--metal-accent-2));
  border-radius: 2px; margin-right: 0.6rem; vertical-align: middle;
  box-shadow: 0 0 6px var(--metal-glow);
}
.section-line { flex: 1; height: 1px; background: linear-gradient(to right, var(--metal-divider), transparent); }
.section-divider { border: none; border-top: 1px solid var(--metal-border); margin: 2rem 0; opacity: 0.5; }

/* =====================================================================
   🃏 文章卡片
   ===================================================================== */
.post-card {
  position: relative; display: flex; margin-bottom: 1.2rem;
  background: var(--metal-bg-card); border: 1px solid var(--metal-border);
  border-radius: 6px; overflow: hidden; transition: all 0.25s ease;
  list-style: none;
  box-shadow: 0 1px 3px var(--metal-card-shadow), inset 0 1px 0 rgba(255,255,255,0.7);
}
.post-card:hover {
  box-shadow: 0 8px 28px var(--metal-card-shadow-h),
              0 0 0 1px var(--metal-accent) inset,
              0 0 16px var(--metal-glow);
  transform: translateY(-2px); border-color: var(--metal-accent);
}
.card-accent {
  width: 3px; flex-shrink: 0;
  background: linear-gradient(180deg, var(--metal-silver-light), var(--metal-silver));
  transition: background 0.25s;
}
.post-card:hover .card-accent { background: linear-gradient(180deg, var(--metal-accent), var(--metal-accent-2)); }

/* 置顶卡片 */
.sticky-card {
  background: var(--metal-sticky-bg);
  border-color: var(--metal-sticky-border);
  box-shadow: 0 2px 8px rgba(58, 123, 213, 0.08), inset 0 1px 0 rgba(255,255,255,0.8);
}
.sticky-card .card-accent {
  width: 4px;
  background: linear-gradient(180deg, var(--metal-accent), var(--metal-accent-3));
  box-shadow: 0 0 8px var(--metal-glow);
}

.card-body-custom { flex: 1; padding: 1.2rem 1.4rem; }
.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; flex-wrap: wrap; gap: 0.5rem; }
.post-meta { font-size: 0.82rem; color: var(--metal-meta); font-family: var(--font-mono); }
.post-category { font-size: 0.76rem; color: var(--metal-accent); background: var(--metal-tag-bg); padding: 2px 10px; border-radius: 3px; border: 1px solid var(--metal-tag-border); font-family: var(--font-mono); }

.card-title { margin: 0 0 0.5rem 0; font-size: 1.12rem; font-weight: 600; line-height: 1.45; }
.card-title a { color: var(--metal-heading) !important; }
.card-title a:hover { color: var(--metal-accent) !important; text-shadow: 0 0 6px var(--metal-glow); }
.card-excerpt { margin: 0 0 0.6rem 0; color: var(--metal-silver-dark); font-size: 0.92rem; line-height: 1.6; text-indent: 0; }
.card-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }

/* 标签 */
.tag-chip {
  display: inline-block; padding: 2px 10px; font-size: 0.73rem;
  color: var(--metal-chip-text) !important; background: var(--metal-tag-bg);
  border: 1px solid var(--metal-tag-border); border-radius: 3px;
  white-space: nowrap; font-family: var(--font-mono); transition: all 0.2s;
}
.tag-chip:hover { background: rgba(58, 123, 213, 0.14); border-color: var(--metal-accent); box-shadow: 0 0 6px var(--metal-glow); }

/* 置顶徽章 */
.sticky-badge {
  display: inline-flex; align-items: center; gap: 3px; padding: 2px 10px;
  font-size: 0.7rem; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--metal-accent), var(--metal-accent-3));
  border-radius: 3px; letter-spacing: 0.05em;
  box-shadow: 0 1px 4px var(--metal-glow-strong); text-transform: uppercase;
}

/* =====================================================================
   📄 分页
   ===================================================================== */
.pagination-nav { margin: 3rem 0 1rem; }
.pagination { display: flex; justify-content: center; gap: 4px; padding: 0; list-style: none; }
.page-item.disabled .page-link { color: var(--metal-silver-light); border-color: var(--metal-border); cursor: not-allowed; background: transparent; }
.page-item.active .page-link {
  background: linear-gradient(135deg, var(--metal-accent), var(--metal-accent-2));
  border-color: var(--metal-accent); color: #fff; font-weight: 700;
  box-shadow: 0 2px 10px var(--metal-glow-strong), inset 0 1px 0 rgba(255,255,255,0.2);
}
.page-link {
  display: block; padding: 0.5rem 0.85rem; min-width: 40px; text-align: center;
  font-size: 0.93rem; color: var(--metal-silver-dark); background: var(--metal-bg-card);
  border: 1px solid var(--metal-border); border-radius: 4px; text-decoration: none;
  transition: all 0.2s; font-family: var(--font-mono);
}
.page-link:hover { background: rgba(58, 123, 213, 0.06); border-color: var(--metal-accent); color: var(--metal-accent); transform: translateY(-1px); box-shadow: 0 2px 8px var(--metal-glow); }

/* =====================================================================
   📝 文章页
   ===================================================================== */
.post-header-custom { margin-bottom: 2rem; }
.post-title-custom { font-size: 1.8rem; font-weight: 800; color: var(--metal-heading); margin: 0 0 1rem 0; line-height: 1.35; letter-spacing: 0.01em; }
.post-meta-bar { display: flex; gap: 1.2rem; flex-wrap: wrap; margin-bottom: 0.8rem; }
.meta-item { font-size: 0.86rem; color: var(--metal-meta); font-family: var(--font-mono); }
.post-tags-bar { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.post-divider { border: none; border-top: 2px solid var(--metal-border); opacity: 0.5; margin: 2rem 0; }

/* 正文排版 */
.post-body p { text-indent: 2em; margin-bottom: 1.2em; text-align: justify; line-height: 1.9; }
.post-body h2 { font-size: 1.4rem; margin: 2rem 0 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--metal-border); color: var(--metal-heading); font-weight: 700; }
.post-body h2::before { content: '▎'; color: var(--metal-accent); margin-right: 0.4rem; }
.post-body h3 { font-size: 1.18rem; margin: 1.5rem 0 0.8rem; color: var(--metal-heading); font-weight: 600; }
.post-body ul, .post-body ol { padding-left: 1.5rem; margin-bottom: 1.2em; }
.post-body li { margin-bottom: 0.4em; }

/* 引用块 */
.post-body blockquote {
  border-left: 4px solid var(--metal-accent);
  background: linear-gradient(90deg, rgba(58,123,213,0.05), transparent);
  padding: 0.8rem 1.2rem; margin: 1.5rem 0; border-radius: 0 6px 6px 0;
  color: var(--metal-silver-dark); font-style: italic;
}
.post-body blockquote p { text-indent: 0; margin-bottom: 0; }

/* 表格 */
.post-body table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.92em; border: 1px solid var(--metal-border); border-radius: 6px; overflow: hidden; }
.post-body th { background: linear-gradient(180deg, #eef2ff, #e4e8f5); border: 1px solid var(--metal-border); padding: 0.6rem 0.9rem; text-align: left; font-weight: 600; color: var(--metal-heading); }
.post-body td { border: 1px solid var(--metal-border); padding: 0.6rem 0.9rem; }
.post-body tr:nth-child(even) td { background: #f3f5f9; }

/* 上一篇/下一篇 */
.post-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--metal-border); }
.post-nav a { display: flex; align-items: center; gap: 0.5rem; padding: 0.6rem 1rem; background: var(--metal-bg-card); border: 1px solid var(--metal-border); border-radius: 6px; font-size: 0.9rem; color: var(--metal-text) !important; max-width: 45%; transition: all 0.2s; }
.post-nav a:hover { background: rgba(58, 123, 213, 0.06); border-color: var(--metal-accent); box-shadow: 0 0 10px var(--metal-glow); }
.nav-arrow { font-size: 1.2rem; color: var(--metal-accent); }
.nav-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* =====================================================================
   📑 目录 TOC — 可折叠左侧面板（v5.1 文字+图标方案）
   ===================================================================== */

/* 宽屏：Grid 布局，TOC 在左，正文在右 */
@media (min-width: 1100px) {
  .post-article {
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "toc header"
      "toc divider1"
      "toc body"
      "toc divider2"
      "toc nav";
    column-gap: 1.5rem;
    max-width: 1120px !important;
    align-items: start;
  }
  .post-header-custom { grid-area: header; }
  .post-body-wrapper { grid-area: body; min-width: 0; }
  .post-body-wrapper > .post-body { min-width: 0; }
  .post-divider { grid-area: divider1; }
  .post-nav { grid-area: nav; }
}

/* TOC 容器 */
.toc-sidebar {
  grid-area: toc;
  position: sticky;
  top: 80px;
  align-self: start;
  z-index: 50;
  transition: width 0.3s ease;
}
@media (min-width: 1100px) {
  .toc-sidebar { width: 220px; max-height: calc(100vh - 100px); overflow-y: auto; }
}
@media (max-width: 1099px) {
  .toc-sidebar {
    position: sticky;
    top: 64px;
    width: 100%;
    max-height: 50vh;
    overflow-y: auto;
    margin-bottom: 1rem;
    z-index: 100;
  }
}

/* TOC 内部面板 */
.toc-inner {
  background: linear-gradient(135deg, #f0f4fa 0%, #e8eef5 100%);
  border: 1px solid var(--metal-border);
  border-left: 4px solid var(--metal-accent);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  box-shadow: 0 2px 10px var(--metal-card-shadow), inset 0 1px 0 rgba(255,255,255,0.6);
  transition: padding 0.3s ease;
}

/* ─── 展开态头部 ─── */
.toc-header-expanded {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(58,123,213,0.15);
}
.toc-toggle {
  width: 26px; height: 26px;
  border: 1px solid var(--metal-border);
  border-radius: 5px;
  background: rgba(255,255,255,0.8);
  color: var(--metal-accent);
  font-size: 0.7rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}
.toc-toggle:hover {
  background: var(--metal-accent);
  color: #fff;
  border-color: var(--metal-accent);
  box-shadow: 0 0 10px var(--metal-glow);
}
.toc-title-text {
  font-size: 0.92rem; font-weight: 700; color: var(--metal-heading);
  letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 0.35rem;
  white-space: nowrap;
}
.toc-icon { color: var(--metal-accent); font-size: 0.95rem; text-shadow: 0 0 6px var(--metal-glow); }

/* ─── 收起态头部（竖排"目录" + 箭头） ─── */
.toc-header-collapsed {
  display: none; /* 默认隐藏，折叠时显示 */
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0;
  cursor: pointer;
  border-bottom: 1px solid rgba(58,123,213,0.12);
  margin-bottom: 0.3rem;
  transition: background 0.2s;
  border-radius: 4px;
}
.toc-header-collapsed:hover {
  background: rgba(58,123,213,0.06);
}
.toc-collapsed-text {
  writing-mode: vertical-lr;
  text-orientation: mixed;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--metal-accent);
  letter-spacing: 0.15em;
  text-shadow: 0 0 4px var(--metal-glow);
}
.toc-collapsed-arrow {
  font-size: 0.7rem;
  color: var(--metal-accent);
  animation: arrowPulse 2s ease-in-out infinite;
}
@keyframes arrowPulse {
  0%, 100% { opacity: 0.5; transform: translateX(0); }
  50%      { opacity: 1;   transform: translateX(2px); }
}

/* TOC 导航链接 */
.toc-nav { display: flex; flex-direction: column; gap: 2px; }
.toc-link {
  display: block; padding: 0.38rem 0.7rem; font-size: 0.82rem;
  color: var(--metal-silver-dark); text-decoration: none;
  border-radius: 4px; border-left: 2px solid transparent;
  transition: all 0.2s ease; line-height: 1.5;
}
.toc-link.toc-h2 { font-weight: 600; color: var(--metal-text); font-size: 0.85rem; padding-left: 0.7rem; }
.toc-link.toc-h3 { font-weight: 400; font-size: 0.78rem; padding-left: 1.6rem; color: var(--metal-meta); }
.toc-link:hover {
  background: rgba(58, 123, 213, 0.08);
  color: var(--metal-accent) !important;
  border-left-color: var(--metal-accent);
  text-shadow: 0 0 6px var(--metal-glow);
  transform: translateX(2px);
}
.toc-link.active {
  background: linear-gradient(90deg, rgba(58,123,213,0.12), transparent);
  color: var(--metal-accent) !important;
  border-left-color: var(--metal-accent-2);
  font-weight: 600;
  box-shadow: inset 2px 0 4px rgba(0,180,216,0.1);
}

/* =====================================================================
   🔀 折叠状态
   ===================================================================== */
.toc-sidebar.collapsed {
  width: 48px !important;
  min-width: 48px;
}
.toc-sidebar.collapsed .toc-nav { display: none; }
.toc-sidebar.collapsed .toc-inner {
  padding: 0.6rem 0.3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 窄屏：默认收起 */
@media (max-width: 1099px) {
  .toc-sidebar:not(.collapsed) {
    max-height: 40vh;
  }
}

/* =====================================================================
   💻 黑客终端代码块（经典黑底绿字 CRT 风格）
   ===================================================================== */
pre, .prompt-box {
  font-family: var(--font-mono) !important;
  font-size: 0.87rem !important;
  line-height: 1.75 !important;
  text-indent: 0 !important;
  background: var(--hacker-bg) !important;
  border: 1px solid #1a2332 !important;
  border-left: 4px solid var(--hacker-green) !important;
  border-radius: 6px;
  padding: 1.8rem 1.2rem 1.2rem 1.2rem !important;
  margin: 1.8rem 0 !important;
  color: var(--hacker-green) !important;
  position: relative;
  overflow-x: auto;
  box-shadow:
    0 8px 28px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.02),
    0 0 0 1px rgba(0, 255, 102, 0.05);
}
pre code, .prompt-box code, pre *, .prompt-box * {
  color: var(--hacker-green) !important;
  background: transparent !important;
  font-family: inherit !important;
  font-size: inherit !important;
  text-shadow: 0 0 4px rgba(0, 255, 102, 0.35) !important;
}

/* 语言标签（顶部右侧小标签） */
pre[data-lang]::before {
  content: attr(data-lang);
  display: block; position: absolute; top: 0; right: 70px;
  padding: 3px 12px; font-size: 0.6rem; font-family: var(--font-mono);
  color: var(--hacker-bg); background: var(--hacker-green);
  border-bottom-left-radius: 4px; border-bottom-right-radius: 4px;
  opacity: 0.95; letter-spacing: 0.08em; text-transform: uppercase;
  font-weight: 700;
}

/* 复制按钮 */
.code-copy-btn {
  position: absolute; top: 8px; right: 8px; padding: 3px 10px;
  font-size: 0.6rem; font-family: var(--font-mono); color: var(--hacker-green);
  background: var(--hacker-bg-elev); border: 1px solid rgba(0,255,102,0.3);
  border-radius: 3px; cursor: pointer; opacity: 0;
  transition: opacity 0.2s, box-shadow 0.2s, background 0.2s; z-index: 10;
  letter-spacing: 0.05em;
}
pre:hover .code-copy-btn { opacity: 1; }
.code-copy-btn:hover {
  background: rgba(0,255,102,0.12); border-color: var(--hacker-green);
  box-shadow: 0 0 10px var(--hacker-green-glow);
}
.code-copy-btn.copied { color: var(--hacker-green); border-color: var(--hacker-green); opacity: 1; }

/* 终端光标 */
pre code::after {
  content: "▊"; display: inline-block; margin-left: 2px;
  animation: blink 1.1s step-end infinite; color: var(--hacker-green); opacity: 0.7;
  text-shadow: 0 0 5px var(--hacker-green);
}
@keyframes blink { 0%, 50% { opacity: 1; } 50.01%, 100% { opacity: 0; } }

/* 代码行号 */
pre .lineno {
  color: rgba(0, 255, 102, 0.3) !important;
  text-shadow: none !important;
  padding-right: 0.8rem;
  border-right: 1px solid rgba(0,255,102,0.15);
  margin-right: 0.8rem;
  user-select: none;
}

/* 行内代码（暗底绿字，微型终端） */
:not(pre) > code {
  font-family: var(--font-mono) !important; font-size: 0.85em !important;
  background: #0d1117 !important; color: var(--hacker-green) !important;
  padding: 2px 8px !important; border-radius: 3px;
  border: 1px solid rgba(0,255,102,0.2); white-space: nowrap;
  text-shadow: 0 0 3px rgba(0,255,102,0.25) !important;
}

/* =====================================================================
   👣 页脚
   ===================================================================== */
.site-footer { background: linear-gradient(180deg, #1a2230 0%, #111822 100%); border-top: 1px solid #2a3444; padding: 2rem 0; margin-top: 3rem; }
.footer-inner { max-width: 820px; margin: 0 auto; padding: 0 20px; text-align: center; }
.footer-quote { font-size: 1rem; color: var(--metal-silver-light); font-weight: 500; margin-bottom: 0.5rem; letter-spacing: 0.04em; text-shadow: 0 0 10px rgba(148,163,184,0.2); }
.footer-meta { font-size: 0.82rem; color: var(--metal-silver-dark); font-family: var(--font-mono); }

/* =====================================================================
   ⬆️ 回到顶部
   ===================================================================== */
.btn-back-to-top {
  position: fixed; bottom: 24px; right: 24px; width: 44px; height: 44px;
  border: 1px solid var(--metal-border-strong); border-radius: 50%;
  background: linear-gradient(135deg, #f6f8fb, #e4e8ef); color: var(--metal-accent);
  font-size: 20px; cursor: pointer;
  box-shadow: 0 4px 14px var(--metal-card-shadow-h), inset 0 1px 0 rgba(255,255,255,0.8);
  opacity: 0; visibility: hidden; transition: all 0.3s; z-index: 1050;
  display: flex; align-items: center; justify-content: center;
}
.btn-back-to-top.visible { opacity: 1; visibility: visible; }
.btn-back-to-top:hover { background: linear-gradient(135deg, var(--metal-accent), var(--metal-accent-2)); color: #fff; border-color: var(--metal-accent); box-shadow: 0 4px 16px var(--metal-glow-strong); transform: translateY(-2px); }

/* =====================================================================
   📱 响应式
   ===================================================================== */
@media (max-width: 768px) {
  .header-inner { padding: 0 14px; }
  .home-container, .post-article { padding: 0 16px; }
  .card-body-custom { padding: 1rem; }
  .card-title { font-size: 1.02rem; }
  .post-title-custom { font-size: 1.35rem; }
  .nav-link { padding: 0.35rem 0.55rem; font-size: 0.86rem; }
  .site-brand { font-size: 0.95rem; }
  .post-nav { flex-direction: column; }
  .post-nav a { max-width: 100%; }
  pre, .prompt-box { font-size: 0.8rem !important; padding: 1.2rem 0.8rem 0.8rem !important; }
}

@media (min-width: 1400px) {
  .home-container, .post-article { max-width: 900px; }
}

/* =====================================================================
   🔒 MathJax 保护
   ===================================================================== */
mjx-container, .MathJax, [data-mml-node], .mjx-container * {
  user-select: none !important;
  -webkit-user-select: none !important;
}

@keyframes metalShimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.post-card:hover .card-title a {
  background: linear-gradient(90deg, var(--metal-accent), var(--metal-accent-2), var(--metal-accent));
  background-size: 200% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: metalShimmer 3s ease infinite;
}

/* 公式拷贝 */
.math-copy-wrapper {
  position: relative;
  cursor: pointer;
  display: inline-block;
}
.math-copy-wrapper mjx-container {
  margin: 0 !important;
}
.math-hidden-tex {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  opacity: 0.001;
  left: 0; top: 0;
  pointer-events: none;
  user-select: text !important;
  -webkit-user-select: text !important;
}
.math-copy-hint {
  position: absolute;
  right: 0;
  top: -1.4em;
  font-size: 0.72rem;
  font-family: monospace;
  color: var(--metal-accent, #3a7bd5);
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--metal-border, #d1d9e2);
  padding: 1px 6px;
  border-radius: 3px;
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
  white-space: nowrap;
  z-index: 5;
}
.math-copy-wrapper:hover .math-copy-hint {
  opacity: 0; /* 默认不显示，点击后才弹 */
}