/* ============================================
       Design System — Tech Blog
       Style: Glass + Gradient accents
       Accent: Blue (#2563EB light / #3B82F6 dark)
       Fonts: JetBrains Mono + System UI
       ============================================ */

/* ---------- Tokens ---------- */
:root {
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-soft: #DBEAFE;
  --accent-glow: rgba(37, 99, 235, 0.15);
  --gradient-accent: linear-gradient(135deg, #2563EB, #7C3AED);
  --gradient-subtle: linear-gradient(135deg, #EEF2FF, #F8FAFC, #F0F9FF);

  /* Professional editorial polish: restrained surfaces and clearer hierarchy. */
  --bg-primary: #F7F8FB;
  --bg-secondary: #FFFFFF;
  --bg-raised: #FFFFFF;
  --bg-code: #F3F6FA;
  --bg-glass: rgba(255, 255, 255, 0.86);
  --surface-paper: #FFFFFF;
  --surface-muted: #F8FAFC;

  --text-primary: #111827;
  --text-secondary: #4B5563;
  --text-tertiary: #8A94A6;
  --text-on-accent: #FFFFFF;

  --border: #DFE5EE;
  --border-light: #EEF2F7;
  --border-accent: rgba(37, 99, 235, 0.22);

  --shadow-card: 0 1px 2px rgba(15, 23, 42, .035), 0 8px 28px rgba(15, 23, 42, .035);
  --shadow-card-hover: 0 10px 30px rgba(15, 23, 42, .075), 0 3px 10px rgba(37, 99, 235, .075);
  --shadow-lg: 0 18px 50px rgba(15, 23, 42, .10), 0 6px 18px rgba(15, 23, 42, .06);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --font-mono: "JetBrains Mono", "Cascadia Code", "Fira Code", "Consolas", "Monaco", monospace;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  --transition: 200ms ease;
  --transition-slow: 350ms ease;
}

/* Dark — system preference fallback (JS-disabled) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #3B82F6;
    --accent-hover: #60A5FA;
    --accent-soft: #1E293B;
    --accent-glow: rgba(59, 130, 246, 0.18);
    --gradient-accent: linear-gradient(135deg, #3B82F6, #8B5CF6);
    --gradient-subtle: linear-gradient(135deg, #0B1121, #0F172A, #0B1121);

    --bg-primary: #0A0F1A;
    --bg-secondary: #111827;
    --bg-raised: #151D2B;
    --bg-code: #0D1520;
    --bg-glass: rgba(17, 24, 39, 0.78);

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-tertiary: #64748B;

    --border: #1E293B;
    --border-light: #162032;
    --border-accent: rgba(59, 130, 246, 0.3);

    --shadow-card: 0 1px 3px rgba(0, 0, 0, .2), 0 1px 2px rgba(0, 0, 0, .15);
    --shadow-card-hover: 0 4px 20px rgba(0, 0, 0, .3), 0 2px 8px rgba(59, 130, 246, .12);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, .4), 0 4px 12px rgba(0, 0, 0, .2);

    --surface-paper: #151D2B;
    --surface-muted: #0F172A;
    --text-on-accent: #FFFFFF;
  }
}

/* Dark — manual toggle */
[data-theme="dark"] {
  --accent: #3B82F6;
  --accent-hover: #60A5FA;
  --accent-soft: #1E293B;
  --accent-glow: rgba(59, 130, 246, 0.18);
  --gradient-accent: linear-gradient(135deg, #3B82F6, #8B5CF6);
  --gradient-subtle: linear-gradient(135deg, #0B1121, #0F172A, #0B1121);

  --bg-primary: #0A0F1A;
  --bg-secondary: #111827;
  --bg-raised: #151D2B;
  --bg-code: #0D1520;
  --bg-glass: rgba(17, 24, 39, 0.78);

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;

  --border: #1E293B;
  --border-light: #162032;
  --border-accent: rgba(59, 130, 246, 0.3);

  --shadow-card: 0 1px 3px rgba(0, 0, 0, .2), 0 1px 2px rgba(0, 0, 0, .15);
  --shadow-card-hover: 0 4px 20px rgba(0, 0, 0, .3), 0 2px 8px rgba(59, 130, 246, .12);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, .4), 0 4px 12px rgba(0, 0, 0, .2);

  --surface-paper: #151D2B;
  --surface-muted: #0F172A;
  --text-on-accent: #FFFFFF;
}

/* Pygments 语法高亮 — 暗色主题 (monokai) */
[data-theme="dark"] .highlight {
  background: #272822;
  color: #F8F8F2;
  padding: 1.1rem 1.4rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .84rem;
  line-height: 1.7;
  border: 1px solid #3E3D32
}

[data-theme="dark"] .highlight pre {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 0;
  overflow: visible;
  line-height: inherit
}

[data-theme="dark"] .highlight code {
  background: none;
  padding: 0;
  border: none;
  color: inherit;
  font-size: inherit
}

[data-theme="dark"] .highlight .hll {
  background-color: #49483e
}

[data-theme="dark"] .highlight .c {
  color: #959077
}

[data-theme="dark"] .highlight .err {
  color: #ED007E;
  background-color: #1E0010
}

[data-theme="dark"] .highlight .esc {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .g {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .k {
  color: #66D9EF
}

[data-theme="dark"] .highlight .l {
  color: #AE81FF
}

[data-theme="dark"] .highlight .n {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .o {
  color: #FF4689
}

[data-theme="dark"] .highlight .x {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .p {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .ch {
  color: #959077
}

[data-theme="dark"] .highlight .cm {
  color: #959077
}

[data-theme="dark"] .highlight .cp {
  color: #959077
}

[data-theme="dark"] .highlight .cpf {
  color: #959077
}

[data-theme="dark"] .highlight .c1 {
  color: #959077
}

[data-theme="dark"] .highlight .cs {
  color: #959077
}

[data-theme="dark"] .highlight .gd {
  color: #FF4689
}

[data-theme="dark"] .highlight .ge {
  color: #F8F8F2;
  font-style: italic
}

[data-theme="dark"] .highlight .ges {
  color: #F8F8F2;
  font-weight: bold;
  font-style: italic
}

[data-theme="dark"] .highlight .gr {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .gh {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .gi {
  color: #A6E22E
}

[data-theme="dark"] .highlight .go {
  color: #66D9EF
}

[data-theme="dark"] .highlight .gp {
  color: #FF4689;
  font-weight: bold
}

[data-theme="dark"] .highlight .gs {
  color: #F8F8F2;
  font-weight: bold
}

[data-theme="dark"] .highlight .gu {
  color: #959077
}

[data-theme="dark"] .highlight .gt {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .kc {
  color: #66D9EF
}

[data-theme="dark"] .highlight .kd {
  color: #66D9EF
}

[data-theme="dark"] .highlight .kn {
  color: #FF4689
}

[data-theme="dark"] .highlight .kp {
  color: #66D9EF
}

[data-theme="dark"] .highlight .kr {
  color: #66D9EF
}

[data-theme="dark"] .highlight .kt {
  color: #66D9EF
}

[data-theme="dark"] .highlight .ld {
  color: #E6DB74
}

[data-theme="dark"] .highlight .m {
  color: #AE81FF
}

[data-theme="dark"] .highlight .s {
  color: #E6DB74
}

[data-theme="dark"] .highlight .na {
  color: #A6E22E
}

[data-theme="dark"] .highlight .nb {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .nc {
  color: #A6E22E
}

[data-theme="dark"] .highlight .no {
  color: #66D9EF
}

[data-theme="dark"] .highlight .nd {
  color: #A6E22E
}

[data-theme="dark"] .highlight .ni {
  color: #F8F8F2;
  font-weight: bold
}

[data-theme="dark"] .highlight .ne {
  color: #A6E22E
}

[data-theme="dark"] .highlight .nf {
  color: #A6E22E
}

[data-theme="dark"] .highlight .nl {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .nn {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .nx {
  color: #A6E22E
}

[data-theme="dark"] .highlight .py {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .nt {
  color: #FF4689
}

[data-theme="dark"] .highlight .nv {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .ow {
  color: #FF4689
}

[data-theme="dark"] .highlight .pm {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .w {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .mb {
  color: #AE81FF
}

[data-theme="dark"] .highlight .mf {
  color: #AE81FF
}

[data-theme="dark"] .highlight .mh {
  color: #AE81FF
}

[data-theme="dark"] .highlight .mi {
  color: #AE81FF
}

[data-theme="dark"] .highlight .mo {
  color: #AE81FF
}

[data-theme="dark"] .highlight .sa {
  color: #E6DB74
}

[data-theme="dark"] .highlight .sb {
  color: #E6DB74
}

[data-theme="dark"] .highlight .sc {
  color: #E6DB74
}

[data-theme="dark"] .highlight .dl {
  color: #E6DB74
}

[data-theme="dark"] .highlight .sd {
  color: #E6DB74
}

[data-theme="dark"] .highlight .s2 {
  color: #E6DB74
}

[data-theme="dark"] .highlight .se {
  color: #AE81FF
}

[data-theme="dark"] .highlight .sh {
  color: #E6DB74
}

[data-theme="dark"] .highlight .si {
  color: #E6DB74
}

[data-theme="dark"] .highlight .sx {
  color: #E6DB74
}

[data-theme="dark"] .highlight .sr {
  color: #E6DB74
}

[data-theme="dark"] .highlight .s1 {
  color: #E6DB74
}

[data-theme="dark"] .highlight .ss {
  color: #E6DB74
}

[data-theme="dark"] .highlight .bp {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .fm {
  color: #A6E22E
}

[data-theme="dark"] .highlight .vc {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .vg {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .vi {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .vm {
  color: #F8F8F2
}

[data-theme="dark"] .highlight .il {
  color: #AE81FF
}
/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0
}

/* 防止任何断点下出现横向滚动条（移动端与桌面端均安全） */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
  max-width: 100%
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding-top: 59px;
  /* 为固定顶部导航栏腾出空间 */
  overflow-x: hidden;
  max-width: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* ---------- Background texture ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(ellipse 70% 48% at 50% -24%, rgba(37, 99, 235, .10), transparent 68%),
    radial-gradient(ellipse 42% 42% at 88% 76%, rgba(124, 58, 237, .07), transparent 72%);
}

/* Subtle grid overlay (dark only) */
[data-theme="dark"] body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .03;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 1.5rem;
  min-width: 0
}

/* ---------- Header ---------- */
/* fixed 固定于页面顶部；body 用 padding-top 防止内容被遮挡 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}

.site-brand {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -.02em;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.site-brand::before {
  content: ">";
  color: var(--accent);
  font-weight: 700;
  font-size: 1.3rem;
  text-shadow: 0 0 10px var(--accent-glow);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: .25rem
}

.site-nav a {
  font-size: .85rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: .45rem .85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.site-nav a:hover {
  color: var(--text-primary);
  background: var(--accent-soft)
}

.site-nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600
}

.site-nav a.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  margin-left: .25rem;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--accent-soft);
}

.theme-icon {
  width: 18px;
  height: 18px;
  transition: opacity var(--transition), transform var(--transition);
}

/* 默认（亮色模式）：显示月亮图标，隐藏太阳 */
.theme-icon-sun { display: none; }
.theme-icon-moon { display: block; }

/* 暗色模式：显示太阳图标，隐藏月亮 */
[data-theme="dark"] .theme-icon-sun { display: block; }
[data-theme="dark"] .theme-icon-moon { display: none; }

/* ---------- Main ---------- */
.site-main {
  flex: 1;
  min-width: 0;
  padding: 3rem 0 5rem
}

/* ---------- Page Header ---------- */
.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  position: relative;
}

.page-header.page-header--hero {
  border-bottom: none;
  margin-bottom: 1.5rem;
}

.page-header::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin-top: 1.25rem;
}

.page-header h1 {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 760;
  color: var(--text-primary);
  letter-spacing: -.035em;
  line-height: 1.25;
  text-wrap: balance;
}

.page-subtitle {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: .55rem;
  font-family: var(--font-mono);
  line-height: 1.7;
}

.page-subtitle strong {
  font-weight: 800;
  font-size: 1.25em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle .dot-sep {
  color: var(--text-tertiary);
  margin: 0 .25rem;
}

/* ---------- Post Cards ---------- */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  min-width: 0;
  overflow: hidden
}

.post-card {
  background: var(--surface-paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.55rem 1.8rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
  min-width: 0;
  max-width: 100%;
  box-shadow: var(--shadow-card);
}

.post-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: var(--gradient-accent);
  border-radius: 0 2px 2px 0;
  opacity: .32;
  transform: scaleY(.7);
  transition: opacity var(--transition), transform var(--transition);
}

.post-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
}

.post-card:hover::after {
  opacity: .9;
  transform: scaleY(1)
}

.post-card time {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--text-tertiary);
  margin-bottom: .52rem;
  letter-spacing: .02em;
}

.post-card time::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
  opacity: .85;
}

.post-card h2 {
  font-size: 1.22rem;
  font-weight: 720;
  line-height: 1.38;
  margin-bottom: .55rem;
  letter-spacing: -.015em;
  text-wrap: balance;
  overflow-wrap: anywhere;
  word-break: break-word
}

.post-card h2 a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition)
}

.post-card h2 a:hover {
  color: var(--accent)
}

.post-card .summary {
  font-size: .92rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: .9rem;
  overflow-wrap: anywhere;
  word-break: break-word
}

.post-card .read-more {
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 650;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  transition: gap var(--transition), color var(--transition);
}

.post-card .read-more::after {
  content: "→";
  transition: transform var(--transition)
}

.post-card:hover .read-more {
  gap: .52rem
}

.post-card:hover .read-more::after {
  transform: translateX(2px)
}

/* ---------- Tech tags (optional flair) ---------- */
.post-card .meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: .25rem;
}

.post-card .meta-tags span {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 500;
  padding: .15rem .55rem;
  border-radius: 99px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border-accent);
}

/* ---------- Article Detail ---------- */
.article-detail {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* 突破 .container (1060px) 约束：负 margin 补偿容器内边距与宽度差 */
/* 仅向右扩展，避免在有 TOC 时遮挡左侧标题 */
@media (min-width:1100px) {
  .article-detail {
    margin-left: auto;
    margin-right: -70px;
  }
}

.article-header {
  margin-bottom: 2rem
}

.article-header time {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-tertiary);
  margin-bottom: .75rem;
}

.article-header time::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-glow);
}

.article-header h1 {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 760;
  line-height: 1.28;
  letter-spacing: -.035em;
  color: var(--text-primary);
  margin-bottom: .8rem;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  font-size: .85rem;
  color: var(--text-secondary);
}

.article-meta .authors {
  display: flex;
  align-items: center;
  gap: .35rem;
}

.article-meta .authors::before {
  content: "@";
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 600;
}

.article-summary {
  color: var(--text-secondary);
  font-size: .96rem;
  line-height: 1.72;
  margin-top: .25rem;
  max-width: 68ch;
  overflow-wrap: anywhere;
}

/* ---------- Article Body ---------- */
.article-body {
  background: var(--surface-paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2.25rem;
  line-height: 1.85;
  font-size: 1rem;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
  box-shadow: var(--shadow-card);
}

/* 锚点跳转偏移（避免被 sticky header 遮挡） */
.article-body h2[id],
.article-body h3[id],
.article-body h4[id],
.article-body h5[id],
.article-body h6[id] {
  scroll-margin-top: 80px;
}

.article-body>*+* {
  margin-top: 1.25rem
}

.article-body h2 {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2.5rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: -.02em;
  position: relative;
}

.article-body h2::after {
  content: "";
  display: block;
  width: 32px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin-top: .55rem;
}

.article-body h3 {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.85rem;
}

.article-body h4,
.article-body h5,
.article-body h6 {
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.5rem;
}

.article-body p {
  margin-top: .85rem;
  color: var(--text-primary)
}

.article-body a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  background: linear-gradient(var(--accent), var(--accent)) 0 100% / 0 1px no-repeat;
  transition: background-size var(--transition);
  padding-bottom: 1px;
}

.article-body a:hover {
  background-size: 100% 1px
}

.article-body ul,
.article-body ol {
  padding-left: 1.5rem
}

.article-body li {
  margin-top: .4rem
}

.article-body li::marker {
  color: var(--accent)
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: .85rem 1.35rem;
  margin: 1.5rem 0;
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
  font-style: italic;
  position: relative;
}

.article-body blockquote::before {
  content: "\201C";
  position: absolute;
  top: -8px;
  left: 8px;
  font-size: 2.5rem;
  color: var(--accent);
  opacity: .2;
  font-family: Georgia, serif;
  line-height: 1;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 2rem 0;
  position: relative;
  overflow: visible;
}

.article-body hr::after {
  content: "*  *  *";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-secondary);
  padding: 0 1rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--text-tertiary);
  letter-spacing: .3em;
}

/* Code */
.article-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.6rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.7;
  margin: 1.35rem 0;
  position: relative;
}

/* Pseudo title bar on code blocks */
.article-body pre::before {
  content: "";
  display: block;
  position: absolute;
  top: .65rem;
  left: 1rem;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--accent-soft);
  color: var(--accent);
  padding: .15em .45em;
  border-radius: 4px;
  border: 1px solid var(--border-accent);
}

.article-body pre code {
  background: none;
  padding: 0;
  border: none;
  color: var(--text-primary);
  font-size: .85rem;
}

/* Pygments 语法高亮 — 亮色主题 */
.highlight {
  background: #f8f8f8;
  padding: 1.1rem 1.4rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .84rem;
  line-height: 1.7;
  border: 1px solid var(--border)
}

.highlight pre {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 0;
  overflow: visible;
  line-height: inherit
}

.highlight code {
  background: none;
  padding: 0;
  border: none;
  color: inherit;
  font-size: inherit
}

.highlight .hll {
  background-color: #ffffcc
}

.highlight .c {
  color: #3D7B7B;
  font-style: italic
}

.highlight .err {
  border: 1px solid #F00
}

.highlight .k {
  color: #008000;
  font-weight: bold
}

.highlight .o {
  color: #666
}

.highlight .ch {
  color: #3D7B7B;
  font-style: italic
}

.highlight .cm {
  color: #3D7B7B;
  font-style: italic
}

.highlight .cp {
  color: #9C6500
}

.highlight .cpf {
  color: #3D7B7B;
  font-style: italic
}

.highlight .c1 {
  color: #3D7B7B;
  font-style: italic
}

.highlight .cs {
  color: #3D7B7B;
  font-style: italic
}

.highlight .gd {
  color: #A00000
}

.highlight .ge {
  font-style: italic
}

.highlight .ges {
  font-weight: bold;
  font-style: italic
}

.highlight .gr {
  color: #E40000
}

.highlight .gh {
  color: #000080;
  font-weight: bold
}

.highlight .gi {
  color: #008400
}

.highlight .go {
  color: #717171
}

.highlight .gp {
  color: #000080;
  font-weight: bold
}

.highlight .gs {
  font-weight: bold
}

.highlight .gu {
  color: #800080;
  font-weight: bold
}

.highlight .gt {
  color: #04D
}

.highlight .kc {
  color: #008000;
  font-weight: bold
}

.highlight .kd {
  color: #008000;
  font-weight: bold
}

.highlight .kn {
  color: #008000;
  font-weight: bold
}

.highlight .kp {
  color: #008000
}

.highlight .kr {
  color: #008000;
  font-weight: bold
}

.highlight .kt {
  color: #B00040
}

.highlight .m {
  color: #666
}

.highlight .s {
  color: #BA2121
}

.highlight .na {
  color: #687822
}

.highlight .nb {
  color: #008000
}

.highlight .nc {
  color: #00F;
  font-weight: bold
}

.highlight .no {
  color: #800
}

.highlight .nd {
  color: #A2F
}

.highlight .ni {
  color: #717171;
  font-weight: bold
}

.highlight .ne {
  color: #CB3F38;
  font-weight: bold
}

.highlight .nf {
  color: #00F
}

.highlight .nl {
  color: #767600
}

.highlight .nn {
  color: #00F;
  font-weight: bold
}

.highlight .nt {
  color: #008000;
  font-weight: bold
}

.highlight .nv {
  color: #19177C
}

.highlight .ow {
  color: #A2F;
  font-weight: bold
}

.highlight .w {
  color: #BBB
}

.highlight .mb {
  color: #666
}

.highlight .mf {
  color: #666
}

.highlight .mh {
  color: #666
}

.highlight .mi {
  color: #666
}

.highlight .mo {
  color: #666
}

.highlight .sa {
  color: #BA2121
}

.highlight .sb {
  color: #BA2121
}

.highlight .sc {
  color: #BA2121
}

.highlight .dl {
  color: #BA2121
}

.highlight .sd {
  color: #BA2121;
  font-style: italic
}

.highlight .s2 {
  color: #BA2121
}

.highlight .se {
  color: #AA5D1F;
  font-weight: bold
}

.highlight .sh {
  color: #BA2121
}

.highlight .si {
  color: #A45A77;
  font-weight: bold
}

.highlight .sx {
  color: #008000
}

.highlight .sr {
  color: #A45A77
}

.highlight .s1 {
  color: #BA2121
}

.highlight .ss {
  color: #19177C
}

.highlight .bp {
  color: #008000
}

.highlight .fm {
  color: #00F
}

.highlight .vc {
  color: #19177C
}

.highlight .vg {
  color: #19177C
}

.highlight .vi {
  color: #19177C
}

.highlight .vm {
  color: #19177C
}

.highlight .il {
  color: #666
}

/* Tables */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.35rem 0;
  font-size: .9rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.article-body thead {
  background: var(--bg-code)
}

.article-body th {
  font-family: var(--font-mono);
  font-weight: 600;
  text-align: left;
  padding: .7rem .9rem;
  border-bottom: 2px solid var(--accent);
  color: var(--text-primary);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.article-body td {
  padding: .6rem .9rem;
  border-bottom: 1px solid var(--border-light)
}

.article-body tr:last-child td {
  border-bottom: none
}

.article-body tbody tr:hover td {
  background: var(--accent-soft)
}

.article-body img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 1.35rem auto;
  cursor: pointer
}

/* ---------- 图片全屏查看 ---------- */
.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .88);
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, visibility .25s ease;
}

.image-lightbox.open {
  opacity: 1;
  visibility: visible
}

.lightbox-img-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  max-width: 100vw;
  max-height: 100vh;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.lightbox-img-wrap::-webkit-scrollbar {
  display: none
}

.image-lightbox img {
  display: block;
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, .5);
  cursor: zoom-in;
  transform-origin: center center;
  transition: transform .18s ease;
  user-select: none;
  -webkit-user-drag: none;
}

.image-lightbox.open img {
  animation: lb-fade-in .25s ease
}

@keyframes lb-fade-in {
  from {
    transform: scale(.92);
    opacity: 0
  }

  to {
    transform: scale(1);
    opacity: 1
  }
}

.lightbox-close {
  position: fixed;
  top: 1.2rem;
  right: 1.5rem;
  z-index: 2;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 50%;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  transition: background .2s ease;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, .25)
}

.lightbox-close svg {
  width: 20px;
  height: 20px;
  stroke: #fff;
  stroke-width: 2
}

.lightbox-zoom-info {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: #fff;
  background: rgba(0, 0, 0, .55);
  padding: .35rem .85rem;
  border-radius: 99px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .2s ease;
}

.lightbox-zoom-info.show {
  opacity: 1
}

.lightbox-hint {
  position: fixed;
  bottom: 3.2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  font-size: .85rem;
  color: rgba(255, 255, 255, .7);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity .3s ease;
}

.lightbox-hint.show {
  opacity: 1
}

/* ---------- 确认弹窗 ---------- */
.confirm-overlay {
  position: fixed;
  inset: 0;
  z-index: 10001;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, visibility .2s ease;
}

.confirm-overlay.open {
  opacity: 1;
  visibility: visible
}

.confirm-dialog {
  background: var(--bg-secondary);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 1.5rem 1.8rem;
  max-width: 420px;
  width: 90vw;
  transform: scale(.92) translateY(10px);
  transition: transform .25s cubic-bezier(.25, .46, .45, .94);
}

.confirm-overlay.open .confirm-dialog {
  transform: scale(1) translateY(0);
}

.confirm-dialog p {
  font-size: .95rem;
  color: var(--text-primary);
  line-height: 1.65;
  margin-bottom: 1.35rem;
}

.confirm-dialog .confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: .65rem;
}

.confirm-dialog .confirm-actions button {
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  padding: .5rem 1.15rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.confirm-btn-cancel {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.confirm-btn-cancel:hover {
  color: var(--accent);
  border-color: var(--accent)
}

.confirm-btn-ok {
  background: var(--gradient-accent);
  border: none;
  color: var(--text-on-accent);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.confirm-btn-ok:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px var(--accent-glow)
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 3rem;
  padding: 1.25rem 0;
}

.pagination a {
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: .55rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}

.pagination a:hover {
  background: var(--accent);
  color: var(--text-on-accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
}

.pagination span {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-tertiary);
  padding: .5rem .75rem;
}

/* ---------- Archives ---------- */


/* 年份标题 */
.archive-year {
  display: flex;
  align-items: flex-end;
  gap: .75rem;
  margin: 3rem 0 1rem;
  padding: 0 0 .75rem 1rem;
  border-left: 4px solid var(--accent);
  border-bottom: 1px solid var(--border-light);
  font-family: var(--font-mono);
  position: relative;
}

.archive-year .year-num {
  font-size: 2.4rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -.04em;
  line-height: 1;
  flex-shrink: 0;
}

.archive-year .year-count {
  font-size: .78rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: .2rem .7rem;
  border-radius: 99px;
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.5;
  margin-bottom: .15rem;
}

/* 月份分组标题 — 卡片式，视觉独立于文章列表 */
.archive-month {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: 1.25rem 0 .5rem .5rem;
  padding: .55rem .9rem .55rem 1rem;
  background: var(--surface-paper);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  font-family: var(--font-mono);
}

.archive-month .month-label {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -.01em;
}

.archive-month .month-count {
  font-size: .72rem;
  font-weight: 500;
  color: var(--text-on-accent);
  background: var(--gradient-accent);
  padding: .15rem .6rem;
  border-radius: 99px;
}

.archive-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .15rem
}

.archive-list li {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  padding: .58rem 1rem;
  border-radius: var(--radius);
  transition: transform .35s cubic-bezier(.25, .46, .45, .94),
    box-shadow .35s cubic-bezier(.25, .46, .45, .94),
    border-color var(--transition);
  border: 1px solid transparent;
  margin-left: .5rem;
  transform: translateZ(0);
  will-change: transform;
}

.archive-list li:hover {
  background: var(--surface-paper);
  border-color: var(--border);
  box-shadow: 0 8px 30px rgba(15, 23, 42, .1), 0 4px 10px rgba(15, 23, 42, .06);
  transform: perspective(800px) translateZ(16px) rotateX(1deg);
}

.archive-list time {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  min-width: 6em;
  transition: transform .3s ease;
}

.archive-list li:hover time {
  transform: translateX(2px);
}

.archive-list a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition), transform .3s ease;
  flex: 1;
  display: inline-block;
  position: relative;
}

.archive-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1.5px;
  border-radius: 1px;
  background: var(--accent);
  transition: width .35s ease;
}

.archive-list a:hover {
  color: var(--accent);
  transform: translateX(6px)
}

.archive-list a:hover::after {
  width: 100%
}

/* ---------- 404 ---------- */
.error-page {
  text-align: center;
  padding: 5rem 0
}

.error-page .error-code {
  font-family: var(--font-mono);
  font-size: 6rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 1rem;
  letter-spacing: -.04em;
}

.error-page h1 {
  font-size: 1.5rem;
  margin-bottom: .75rem;
  letter-spacing: -.02em;
  text-wrap: balance
}

.error-page p {
  color: var(--text-secondary);
  margin-bottom: 2.25rem
}

.error-page a {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .88rem;
  color: var(--text-on-accent);
  text-decoration: none;
  padding: .65rem 1.75rem;
  background: var(--accent);
  border-radius: var(--radius);
  transition: all var(--transition);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.error-page a:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px var(--accent-glow);
  transform: translateY(-1px);
}

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-tertiary)
}

.empty-state .empty-icon {
  font-family: var(--font-mono);
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: .35;
}

.empty-state p {
  font-family: var(--font-mono);
  font-size: .85rem
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  z-index: 81;
  border-top: 1px solid var(--border-light);
  padding: 2rem 0;
  text-align: center;
  font-size: .78rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.site-footer .footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer .footer-dot {
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
  margin: 0 .4rem;
  vertical-align: middle;
}

.site-footer .footer-publish {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-decoration: none;
  padding: .35rem .7rem;
  border: 1px solid var(--border);
  border-radius: 99px;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: .3rem;
}

.site-footer .footer-publish::before {
  content: "+";
  font-size: .9rem;
  line-height: 1;
  color: var(--accent);
}

.site-footer .footer-publish:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

@media (max-width:768px) {
  .site-footer .footer-row {
    justify-content: center;
    text-align: center
  }
}

/* ---------- Scrollbar ---------- */
[data-theme="dark"] ::-webkit-scrollbar {
  width: 6px;
  height: 6px
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg-primary)
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: #475569
}

/* ---------- A11y ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (prefers-reduced-motion:reduce) {

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important
  }
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: var(--text-on-accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(37, 99, 235, .35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px) scale(.9);
  transition: all 250ms cubic-bezier(.4, 0, .2, 1);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  background: var(--accent-hover);
  box-shadow: 0 6px 20px rgba(37, 99, 235, .45);
  transform: translateY(-2px) scale(1.05);
}

.back-to-top:active {
  transform: scale(.92)
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round
}

/* ---------- TOC Sidebar ---------- */
.toc-sidebar {
  position: fixed;
  top: 59px;
  left: 15%;
  bottom: 0;
  z-index: 80;
  width: 300px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-right: 1px solid var(--border-light);
  transform: translateX(-100%);
  transition: transform 300ms cubic-bezier(.4, 0, .2, 1);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.toc-sidebar.open {
  transform: translateX(0)
}

.toc-inner {
  padding: 1rem .75rem 2rem
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 .5rem .85rem;
  margin-bottom: .25rem;
  border-bottom: 1px solid var(--border-light);
}

.toc-title {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: .1em;
}

.toc-close {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.toc-close:hover {
  color: var(--accent);
  border-color: var(--accent)
}

.toc-close svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .1rem
}

.toc-item a {
  display: block;
  font-size: .82rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: .5rem .65rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.toc-item a:hover {
  color: var(--text-primary);
  background: var(--accent-soft)
}

.toc-item a:active {
  background: var(--accent-soft);
  opacity: .8
}

.toc-item.toc-level-3 a {
  padding-left: 1.15rem;
  font-size: .78rem
}

.toc-item.toc-level-4 a {
  padding-left: 1.7rem;
  font-size: .76rem
}

.toc-item.toc-level-5 a {
  padding-left: 2.25rem;
  font-size: .74rem
}

.toc-item.toc-level-6 a {
  padding-left: 2.8rem;
  font-size: .74rem
}

.toc-item a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

/* TOC 阅读进度条 */
.toc-progress {
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  width: 0%;
  transition: width 80ms linear;
  margin-bottom: .85rem;
}

/* TOC 移动端蒙层 */
.toc-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  top: 59px;
  z-index: 79;
  background: rgba(0, 0, 0, .25);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 300ms ease;
}

.toc-backdrop.visible {
  display: block;
  opacity: 1
}

/* TOC toggle button (mobile) */
.toc-toggle {
  display: none;
  position: fixed;
  top: 72px;
  left: 15%;
  z-index: 85;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-raised);
  color: var(--text-tertiary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
}

.toc-toggle:hover {
  color: var(--accent);
  border-color: var(--accent)
}

.toc-toggle:active {
  transform: scale(.95)
}

.has-toc .toc-toggle {
  display: flex
}

@media (min-width:1024px) {
  .site-main {
    padding: 3.5rem 0 5rem
  }

  .article-body {
    padding: 2.5rem 2.25rem
  }

  .toc-sidebar {
    transform: translateX(0) !important;
    bottom: auto;
    max-height: calc(100vh - 59px)
  }

  .has-toc .container {
    margin-left: calc(15% + 310px);
    margin-right: auto
  }

  .has-toc .site-footer {
    margin-left: calc(15% + 310px)
  }

  .has-toc .site-footer .container {
    margin-left: 0;
    margin-right: auto
  }

  .toc-toggle {
    display: none !important
  }

  .toc-backdrop {
    display: none !important
  }

  .toc-close {
    display: none !important
  }
}

/* ---------- Responsive ---------- */
/* Mobile readable responsive overrides — 断点提升到 768px，覆盖大屏手机横屏 / iPad 竖屏。 */
@media (max-width:768px) {
  html {
    font-size: 16px
  }

  .container {
    padding: 0 clamp(.85rem, 4vw, 1rem);
    max-width: 100%
  }

  body {
    padding-top: 53px
  }

  .site-header .container {
    min-width: 0;
    height: auto;
    min-height: 52px;
    gap: .55rem;
    padding-top: .35rem;
    padding-bottom: .35rem;
  }

  .site-brand {
    font-size: .9rem;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 0
  }

  .site-nav {
    min-width: 0;
    flex: 1;
    justify-content: flex-end;
    /* 移动端导航链接靠右对齐 */
    gap: .15rem;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    touch-action: manipulation;
    max-width: 100%;
    padding: .1rem 0;
  }

  .site-nav::-webkit-scrollbar {
    display: none
  }

  .site-nav a {
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: .78rem;
    padding: .35rem .58rem;
    white-space: nowrap;
    flex: 0 0 auto;
  }

  .site-main {
    padding: 1.9rem 0 3.5rem;
    overflow-x: hidden;
    min-width: 0
  }

  .page-header {
    margin-bottom: 1.6rem;
    padding-bottom: 1rem
  }

  .page-header::after {
    width: 40px;
    margin-top: .9rem
  }

  .page-header h1 {
    font-size: clamp(1.34rem, 7vw, 1.55rem);
    line-height: 1.3;
    text-wrap: balance
  }

  .page-subtitle {
    font-size: .88rem;
    line-height: 1.72
  }

  .page-subtitle strong {
    font-size: 1.12em
  }

  .post-list {
    gap: 1rem;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden
  }

  .post-card {
    max-width: 100%;
    min-width: 0;
    padding: 1.05rem 1rem;
    border-radius: var(--radius);
    overflow: hidden
  }

  .post-card:hover {
    transform: none
  }

  .post-card::after {
    left: 1px;
    width: 2px;
    top: 14px;
    bottom: 14px
  }

  .post-card h2 {
    font-size: 1.08rem;
    line-height: 1.45;
    margin-bottom: .45rem;
    overflow-wrap: anywhere;
    word-break: break-word
  }

  .post-card .summary {
    font-size: .9rem;
    line-height: 1.72;
    margin-bottom: .75rem;
    overflow-wrap: anywhere;
    word-break: break-word
  }

  .post-card .read-more {
    min-height: 38px;
    padding: .2rem 0;
    touch-action: manipulation
  }

  article,
  .article-header,
  .article-body {
    width: 100%;
    max-width: 100%;
    min-width: 0
  }

  .article-header {
    margin-bottom: 1.35rem;
    overflow-wrap: anywhere
  }

  .article-header h1 {
    font-size: clamp(1.34rem, 7vw, 1.62rem);
    line-height: 1.34;
    overflow-wrap: anywhere;
    text-wrap: balance
  }

  .article-meta {
    font-size: .82rem;
    gap: .55rem
  }

  .article-summary {
    font-size: .9rem;
    line-height: 1.7;
    overflow-wrap: anywhere
  }

  .article-body {
    padding: 1.15rem 1rem;
    font-size: .96rem;
    line-height: 1.82;
    border-radius: var(--radius);
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .article-body>*+* {
    margin-top: 1rem
  }

  .article-body h2 {
    font-size: 1.15rem;
    line-height: 1.45;
    margin-top: 2rem;
    padding-bottom: .45rem
  }

  .article-body h3 {
    font-size: 1.03rem;
    line-height: 1.5;
    margin-top: 1.55rem
  }

  .article-body ul,
  .article-body ol {
    padding-left: 1.15rem
  }

  .article-body blockquote {
    padding: .75rem 1rem;
    margin: 1.25rem 0
  }

  .article-body pre,
  .highlight {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1rem .85rem;
    font-size: .78rem;
    margin-left: 0;
    margin-right: 0;
    border-radius: var(--radius-sm);
  }

  .article-body pre code,
  .highlight code {
    white-space: pre;
    word-break: normal;
    overflow-wrap: normal
  }

  .article-body table {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    font-size: .82rem;
  }

  .article-body th,
  .article-body td {
    padding: .55rem .7rem
  }

  .article-body img {
    max-width: 100%;
    height: auto;
    margin: 1.1rem auto;
    cursor: pointer
  }

  .article-body iframe,
  .article-body video {
    max-width: 100%;
    height: auto
  }

  .pagination {
    justify-content: space-between;
    gap: .5rem;
    margin-top: 2rem;
    padding: .8rem 0
  }

  .pagination a {
    min-height: 42px;
    padding: .5rem .75rem;
    font-size: .76rem;
    justify-content: center;
    touch-action: manipulation;
  }

  .pagination span {
    font-size: .76rem;
    padding: .4rem .35rem;
    text-align: center
  }

  .archive-year {
    margin: 2rem 0 .8rem;
    padding: 0 0 .5rem .75rem;
    border-left-width: 3px
  }

  .archive-year .year-num {
    font-size: 1.6rem
  }

  .archive-month {
    margin: .75rem 0 .35rem .25rem;
    padding: .45rem .7rem
  }

  .archive-month .month-label {
    font-size: .9rem
  }

  .archive-list {
    gap: .35rem
  }

  .archive-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: .15rem;
    padding: .65rem .75rem
  }

  .archive-list time {
    min-width: 0;
    font-size: .75rem
  }

  .archive-list a {
    line-height: 1.55;
    overflow-wrap: anywhere
  }

  .error-page {
    padding: 3rem 0
  }

  .error-page .error-code {
    font-size: 4rem
  }

  .error-page h1 {
    font-size: 1.25rem
  }

  .error-page a {
    display: inline-flex;
    align-items: center;
    min-height: 44px
  }

  .empty-state {
    padding: 3rem .5rem
  }

  .empty-state .empty-icon {
    font-size: 1.5rem;
    overflow-wrap: anywhere
  }

  .site-footer {
    padding: 1.5rem 0 calc(1.5rem + env(safe-area-inset-bottom))
  }

  .site-footer .footer-row {
    justify-content: center;
    text-align: center;
    gap: .75rem
  }

  .site-footer .footer-publish {
    min-height: 38px;
    padding: .4rem .8rem;
    touch-action: manipulation
  }

  .back-to-top {
    right: 1rem;
    bottom: calc(1rem + env(safe-area-inset-bottom));
    width: 42px;
    height: 42px
  }

  /* 移动端 header 约 52px，目录抽屉跟随顶部栏 */
  .toc-sidebar {
    top: 52px;
    left: 0;
    width: min(86vw, 320px);
    max-width: 320px;
    transform: translateX(-105%);
  }

  .toc-backdrop {
    top: 52px
  }

  .toc-toggle {
    top: calc(64px + env(safe-area-inset-top));
    left: clamp(.85rem, 4vw, 1rem);
    width: 44px;
    height: 44px;
    touch-action: manipulation;
  }

  .toc-close {
    display: flex;
    min-width: 36px;
    min-height: 36px;
    touch-action: manipulation
  }

  .toc-item a {
    min-height: 40px;
    display: flex;
    align-items: center
  }
}

/* 中等屏幕（768–1023px）：保持居中容器，避免被移动端紧凑样式影响 */
@media (min-width:769px) and (max-width:1023px) {
  .container {
    max-width: 760px;
    padding: 0 1.25rem
  }

  .site-main {
    padding: 2.5rem 0 4rem
  }

  .toc-sidebar {
    left: 0;
    width: min(40vw, 320px);
    max-width: 320px
  }

  .toc-toggle {
    left: 1.25rem;
    touch-action: manipulation
  }

  .toc-close {
    display: flex
  }
}

/* Larger screens — subtle layout enhancement */
@media (min-width:1024px) {
  .site-main {
    padding: 3.5rem 0 5rem
  }

  .article-body {
    padding: 2.5rem 2.25rem
  }
}