/* -------------------- Variables -------------------- */
:root {
  /* Backgrounds — warm cream base, feels editorial not corporate */
  --bg-body: #faf8f5;
  --bg-elevated: #ffffff;
  --bg-muted: #f0ede8;

  /* Accent — airy sky blue, clean and calm */
  --accent: #0ea5e9;
  --accent-strong: #0369a1;
  --accent-soft: #f0f9ff;

  /* Text — warm near-black, easier on the eyes than pure black */
  --text-primary: #18181b;
  --text-secondary: #71717a;

  /* Borders & Shadows */
  --border-soft: #e4e4e7;
  --shadow-soft: 0 1px 3px rgba(0,0,0,0.04), 0 6px 20px rgba(0,0,0,0.08);
  --shadow-raised: 0 2px 8px rgba(0,0,0,0.06), 0 16px 40px rgba(0,0,0,0.1);

  /* Shape */
  --radius-md: 12px;
  --radius-lg: 18px;

  /* Fonts */
  --font-sans: 'Source Sans 3', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', 'Consolas', 'Menlo', 'Monaco', 'Liberation Mono', 'Courier New', monospace;

  /* Nav */
  --nav-title-bg: linear-gradient(135deg, #f0f9ff, #e0f2fe 60%, #bae6fd);
  --nav-title-border: rgba(14, 165, 233, 0.18);
  --nav-title-text: #18181b;
  --nav-pill-bg: rgba(14, 165, 233, 0.06);
  --nav-pill-border: rgba(14, 165, 233, 0.14);
  --nav-pill-text: #0c4a6e;
  --nav-pill-hover-bg: #0ea5e9;
  --nav-pill-hover-text: #ffffff;
}

:root.dark-mode {
  /* Warm dark — charcoal with amber undertones, cozy not cold */
  --bg-body: #0c0a09;
  --bg-elevated: #1c1917;
  --bg-muted: #292524;

  /* Accent — soft sky blue, legible on dark */
  --accent: #7dd3fc;
  --accent-strong: #bae6fd;
  --accent-soft: #082f49;

  /* Text — warm white and warm gray */
  --text-primary: #fafaf9;
  --text-secondary: #a8a29e;

  /* Borders & Shadows */
  --border-soft: #292524;
  --shadow-soft: 0 1px 3px rgba(0,0,0,0.2), 0 6px 20px rgba(0,0,0,0.4);
  --shadow-raised: 0 2px 8px rgba(0,0,0,0.3), 0 16px 40px rgba(0,0,0,0.6);

  /* Nav */
  --nav-title-bg: linear-gradient(135deg, #1c1917, #0f172a 60%, #0c4a6e);
  --nav-title-border: rgba(125, 211, 252, 0.3);
  --nav-title-text: #fafaf9;
  --nav-pill-bg: rgba(125, 211, 252, 0.1);
  --nav-pill-border: rgba(125, 211, 252, 0.2);
  --nav-pill-text: #e0f2fe;
  --nav-pill-hover-bg: #7dd3fc;
  --nav-pill-hover-text: #0c0a09;
}

/* -------------------- Reset & Base -------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  margin: 0;
  line-height: 1.65;
  transition: background 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.18s ease, opacity 0.18s ease;
}
a:hover, a:focus { color: var(--accent-strong); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: inherit;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
p { color: var(--text-secondary); }

.post-content ol,
.post-content ul,
.post-content li {
  color: var(--text-secondary);
}

.post-content mjx-container[jax="CHTML"] {
  color: var(--text-primary);
}

/* -------------------- Layout -------------------- */
.wrapper {
  max-width: 1280px !important;
  width: 100%;
  padding: 0 2.5rem;
  margin-left: auto;
  margin-right: auto;
  transition: background 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}
.page-content { padding: 1.2rem 0 4rem; }

/* -------------------- Components -------------------- */
/* Header */
.site-header {
  border-top: none !important;
  border-bottom: 1px solid rgba(228, 228, 231, 0.45);
  background: rgba(250, 248, 245, 0.8);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: none;
  font-family: var(--font-sans);
  min-height: 0;
}
.site-header .wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.52rem 0;
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  padding: 0.22rem 0.6rem;
  border-radius: var(--radius-md);
  background: none;
  border: none;
  box-shadow: none;
  transition: color 0.15s ease, background 0.15s ease;
  font-family: inherit;
  line-height: 1;
  margin-bottom: 0;
  float: none;
}
.site-title__icon {
  width: 1.25rem;
  height: 1.25rem;
  display: block;
  flex-shrink: 0;
}
.site-title__text {
  line-height: 1;
}
.site-title:hover,
.site-title:focus {
  color: var(--accent);
  background: rgba(15, 23, 42, 0.04);
  transform: none;
  box-shadow: none;
}

.site-nav {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.18rem;
  line-height: 1;
  float: none;
}
.site-nav .page-link {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.88rem;
  padding: 0.22rem 0.7rem;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  box-shadow: none;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  font-family: inherit;
}
.site-nav .page-link:hover,
.site-nav .page-link:focus {
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.035);
  border-color: rgba(15, 23, 42, 0.05);
  transform: none;
  box-shadow: none;
}
.site-nav .page-link--active {
  color: var(--text-primary);
  font-weight: 600;
  background: transparent;
  border-color: transparent;
  box-shadow: inset 0 -2px 0 var(--accent);
  border-radius: 0;
}

pre,
code {
  font-family: var(--font-mono);
  font-size: 0.95em;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "calt" 0;
}

/* Code Highlight (Light) - VSCode Light+ Theme */
/* -- highlight light theme styles injected below -- */
div.highlight {
  background: #f6f8fa !important;
  color: #24292f;
  border-radius: 12px;
  border: 1px solid #e6e6e6;
  font-family: var(--font-mono);
  font-size: 0.95em;
}
div.highlight.highlight {
  background: #f6f8fa !important;
}
div.highlight pre,
div.highlight code,
div.highlight table {
  background: transparent !important;
  border: none;
  margin: 0;
  color: inherit;
}
div.highlight td { border: none; }
div.highlight .gutter { border-right: none !important; }
div.highlight table td { padding: 2px; }
div.highlight table pre { margin: 0; }
div.highlight pre,
div.highlight table {
  padding: 0;
  border-collapse: collapse;
  border-radius: 12px;
}
div.highlight .rouge-gutter {
  width: 3.5ch;
  min-width: 3.5ch;
  padding-right: 1ch;
  text-align: right;
}
div.highlight .rouge-code pre {
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}
div.highlight .rouge-gutter .lineno {
  display: block;
}
div.highlight, div.highlight .w { color: #24292f; background-color: #f6f8fa; }
.highlight .k, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kt, .highlight .kv { color: #cf222e; }
.highlight .gr { color: #f6f8fa; }
.highlight .gd { color: #82071e; background-color: #ffebe9; }
.highlight .nb, .highlight .nc, .highlight .no, .highlight .nn { color: #953800; }
.highlight .sr, .highlight .na, .highlight .nt { color: #116329; }
.highlight .gi { color: #116329; background-color: #dafbe1; }
.highlight .ges { font-weight: bold; font-style: italic; }
.highlight .kc, .highlight .l, .highlight .ld, .highlight .m, .highlight .mb, .highlight .mf, .highlight .mh, .highlight .mi, .highlight .il, .highlight .mo, .highlight .mx, .highlight .sb, .highlight .bp, .highlight .ne, .highlight .nl, .highlight .py, .highlight .nv, .highlight .vc, .highlight .vg, .highlight .vi, .highlight .vm, .highlight .o, .highlight .ow { color: #0550ae; }
.highlight .gh, .highlight .gu { color: #0550ae; font-weight: bold; }
.highlight .s, .highlight .sa, .highlight .sc, .highlight .dl, .highlight .sd, .highlight .s2, .highlight .se, .highlight .sh, .highlight .sx, .highlight .s1, .highlight .ss { color: #0a3069; }
.highlight .nd, .highlight .nf, .highlight .fm { color: #8250df; }
.highlight .err { color: #f6f8fa; background-color: #82071e; }
.highlight .c, .highlight .ch, .highlight .cd, .highlight .cm, .highlight .cp, .highlight .cpf, .highlight .c1, .highlight .cs { color: #6e7781; }
.highlight .gl, .highlight .gt { color: #6e7781; }
.highlight .ni, .highlight .si { color: #24292f; }
.highlight .ge { color: #24292f; font-style: italic; }
.highlight .gs { color: #24292f; font-weight: bold; }

/* -------------------- Theme: Dark Mode -------------------- */
.dark-mode .site-header {
  background: rgba(12, 10, 9, 0.84);
  box-shadow: none;
  border-bottom-color: rgba(255,255,255,0.05);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
}
.dark-mode .site-title {
  background: none;
  border: none;
  box-shadow: none;
  color: var(--text-primary);
}
.dark-mode .site-title:hover,
.dark-mode .site-title:focus {
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent);
}
.dark-mode .site-nav .page-link {
  color: var(--text-secondary);
  background: transparent;
  border-color: transparent;
}
.dark-mode .site-nav .page-link:hover,
.dark-mode .site-nav .page-link:focus {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.05);
}
.dark-mode .site-nav .page-link--active {
  color: var(--text-primary);
  background: transparent;
  border-color: transparent;
  box-shadow: inset 0 -2px 0 var(--accent);
  border-radius: 0;
}
.dark-mode .wrapper { background: var(--bg-body); color: var(--text-primary); }
.dark-mode .page-content,
.dark-mode .home-sidebar,
.dark-mode .post-card {
  background: var(--bg-elevated);
  color: var(--text-primary);
}
/* Dark hero — warm breathing gradient */
/* VSCode Dark+ Theme */
/* -- highlight dark theme styles injected below -- */
.dark-mode div.highlight {
  background: #272822 !important;
  color: #ffffff;
  border-radius: 12px;
  border: 1px solid #2a2a2a;
  font-family: var(--font-mono);
  font-size: 0.95em;
}
.dark-mode div.highlight pre,
.dark-mode div.highlight code,
.dark-mode div.highlight table {
  background: transparent !important;
  border: none;
  margin: 0;
  color: inherit;
}
.dark-mode div.highlight td { border: none; }
.dark-mode div.highlight .gutter { border-right: none !important; }
.dark-mode div.highlight table td { padding: 2px; }
.dark-mode div.highlight table pre { margin: 0; }
.dark-mode .highlight .gh {
  color: #999999;
}
.dark-mode .highlight .sr {
  color: #f6aa11;
}
.dark-mode .highlight .go {
  color: #888888;
}
.dark-mode .highlight .gp {
  color: #555555;
}
.dark-mode .highlight .ge {
  font-style: italic;
}
.dark-mode .highlight .ges {
  font-weight: bold;
  font-style: italic;
}
.dark-mode .highlight .gs {
  font-weight: bold;
}
.dark-mode .highlight .gu {
  color: #aaaaaa;
}
.dark-mode .highlight .nb {
  color: #f6aa11;
}
.dark-mode .highlight .cm {
  color: #75715e;
}
.dark-mode .highlight .cp {
  color: #75715e;
}
.dark-mode .highlight .c1 {
  color: #75715e;
}
.dark-mode .highlight .cs {
  color: #75715e;
}
.dark-mode .highlight .c, .dark-mode .highlight .ch, .dark-mode .highlight .cd, .dark-mode .highlight .cpf {
  color: #75715e;
}
.dark-mode .highlight .err {
  color: #960050;
}
.dark-mode .highlight .gr {
  color: #960050;
}
.dark-mode .highlight .gt {
  color: #960050;
}
.dark-mode .highlight .gd {
  color: #49483e;
}
.dark-mode .highlight .gi {
  color: #49483e;
}
.dark-mode .highlight .kc {
  color: #66d9ef;
}
.dark-mode .highlight .kd {
  color: #66d9ef;
}
.dark-mode .highlight .kr {
  color: #66d9ef;
}
.dark-mode .highlight .no {
  color: #66d9ef;
}
.dark-mode .highlight .kt {
  color: #66d9ef;
}
.dark-mode .highlight .mf {
  color: #ae81ff;
}
.dark-mode .highlight .mh {
  color: #ae81ff;
}
.dark-mode .highlight .il {
  color: #ae81ff;
}
.dark-mode .highlight .mi {
  color: #ae81ff;
}
.dark-mode .highlight .mo {
  color: #ae81ff;
}
.dark-mode .highlight .m, .dark-mode .highlight .mb, .dark-mode .highlight .mx {
  color: #ae81ff;
}
.dark-mode .highlight .sc {
  color: #ae81ff;
}
.dark-mode .highlight .se {
  color: #ae81ff;
}
.dark-mode .highlight .ss {
  color: #ae81ff;
}
.dark-mode .highlight .sd {
  color: #e6db74;
}
.dark-mode .highlight .s2 {
  color: #e6db74;
}
.dark-mode .highlight .sb {
  color: #e6db74;
}
.dark-mode .highlight .sh {
  color: #e6db74;
}
.dark-mode .highlight .si {
  color: #e6db74;
}
.dark-mode .highlight .sx {
  color: #e6db74;
}
.dark-mode .highlight .s1 {
  color: #e6db74;
}
.dark-mode .highlight .s, .dark-mode .highlight .sa, .dark-mode .highlight .dl {
  color: #e6db74;
}
.dark-mode .highlight .na {
  color: #a6e22e;
}
.dark-mode .highlight .nc {
  color: #a6e22e;
}
.dark-mode .highlight .nd {
  color: #a6e22e;
}
.dark-mode .highlight .ne {
  color: #a6e22e;
}
.dark-mode .highlight .nf, .dark-mode .highlight .fm {
  color: #a6e22e;
}
.dark-mode .highlight .vc {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .nn {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .nl {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .ni {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .bp {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .vg {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .vi {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .nv, .dark-mode .highlight .vm {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .w {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .n, .dark-mode .highlight .py, .dark-mode .highlight .nx {
  color: #ffffff;
  background-color: #272822;
}
.dark-mode .highlight .ow {
  color: #f92672;
}
.dark-mode .highlight .nt {
  color: #f92672;
}
.dark-mode .highlight .k, .dark-mode .highlight .kv {
  color: #f92672;
}
.dark-mode .highlight .kn {
  color: #f92672;
}
.dark-mode .highlight .kp {
  color: #f92672;
}
.dark-mode .highlight .o {
  color: #f92672;
}

/* -------------------- Media Queries -------------------- */
@media (max-width: 640px) {
  .site-header .wrapper {
    flex-direction: column;
    align-items: stretch;
  }
  .page-content {
    padding-top: 0.95rem;
  }
  .site-nav {
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.6rem;
  }
  .site-footer__inner {
    padding: 0.8rem 0 0.5rem 0;
  }
}

/* -------------------- Home -------------------- */
.home-with-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  align-items: start;
  gap: 2.75rem;
}

.home-main {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

@keyframes hero-gradient {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.home-sidebar {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 1.9rem;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(15, 23, 42, 0.04);
  position: sticky;
  top: 110px;
}
.home-sidebar__title {
  font-size: 0.78rem;
  font-weight: 700;
  margin: 0 0 1rem;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}
.home-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  max-height: 500px;
  overflow-y: auto;
  padding-right: 5px;
}

.home-sidebar__list::-webkit-scrollbar {
  width: 6px;
}

.home-sidebar__list::-webkit-scrollbar-thumb {
  background-color: var(--border-soft);
  border-radius: 3px;
}
.home-sidebar__item { font-size: 0.95rem; }
.home-sidebar__link {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 0.55rem 0.75rem; border-radius: 10px; color: var(--text-secondary);
  border: 1px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.home-sidebar__link:hover, .home-sidebar__link:focus {
  background: rgba(15, 23, 42, 0.03); border-color: rgba(15, 23, 42, 0.05); color: var(--text-primary);
}
.home-sidebar__count {
  background: rgba(15, 23, 42, 0.05); color: var(--text-secondary);
  border-radius: 999px; padding: 0.15rem 0.65rem; font-size: 0.8rem; font-weight: 500;
}

/* Posts */
.post-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1.6rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.post-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-soft);
  transition: box-shadow 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
  display: flex;
}
.post-card:hover, .post-card:focus-within {
  box-shadow: 0 4px 14px rgba(0,0,0,0.07), 0 14px 30px rgba(0,0,0,0.08);
  border-color: rgba(14, 165, 233, 0.28);
  background: #fffdfb;
}
.post-card__link {
  display: flex;
  width: 100%;
  min-height: 100%;
  color: inherit;
  text-decoration: none;
  border-radius: inherit;
}
.post-card__link:focus-visible {
  outline: 2px solid rgba(14, 165, 233, 0.35);
  outline-offset: 3px;
}
.post-card__inner { display: flex; flex-direction: column; padding: 1.6rem; gap: 0.85rem; width: 100%; }
.post-card__meta {
  display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap;
  font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-secondary);
}
.post-card__cat {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.62rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  letter-spacing: 0.08em;
}
.post-card__cat--journal {
  background: #ecfdf5;
  color: #047857;
}
.post-card__cat--learning {
  background: #eff6ff;
  color: #1d4ed8;
}
.post-card__cat--engineering {
  background: #e0f2fe;
  color: #0369a1;
}
.post-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin: 0;
  font-family: inherit;
}
.post-card:hover .post-card__title,
.post-card:focus-within .post-card__title {
  color: var(--accent);
}
.post-card__excerpt { margin: 0; color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; }
.post-card__tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin: 0; padding: 0; list-style: none; }
.post-card__tag {
  padding: 0.2rem 0.6rem; background: var(--accent-soft);
  border-radius: 999px; font-size: 0.78rem; color: var(--accent-strong); font-weight: 500;
}

.dark-mode .post-card:hover,
.dark-mode .post-card:focus-within {
  background: #18181f;
  border-color: rgba(125, 211, 252, 0.35);
  box-shadow: 0 6px 16px rgba(0,0,0,0.28), 0 18px 36px rgba(0,0,0,0.24);
}

.dark-mode .post-card__cat--journal {
  background: rgba(16, 185, 129, 0.14);
  color: #6ee7b7;
}

.dark-mode .post-card__cat--learning {
  background: rgba(59, 130, 246, 0.14);
  color: #93c5fd;
}

.dark-mode .post-card__cat--engineering {
  background: rgba(14, 165, 233, 0.18);
  color: #bae6fd;
}

/* Home responsive */
@media (max-width: 960px) {
  .home-with-sidebar { grid-template-columns: 1fr; }
  .home-sidebar { position: static; }
}
@media (max-width: 768px) {
  .post-list { grid-template-columns: 1fr; }
}

/* -------------------- Page Layout (tags, categories, credentials) -------------------- */
.page-wrap {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-body > :first-child {
  margin-top: 0;
}

.page-body > :last-child {
  margin-bottom: 0;
}

/* -------------------- Tag Index -------------------- */
.tag-index { display: grid; gap: 1rem; }
.tag-index__section {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  box-shadow: 0 6px 18px rgba(0,0,0,0.03);
  scroll-margin-top: 120px;
  overflow: hidden;
}
.tag-index__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0;
  padding: 0.9rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.025);
  border-bottom: 1px solid var(--border-soft);
}
.tag-index__count {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
}
.tag-index__list { list-style: none; margin: 0; padding: 0; }
.tag-index__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.72rem 1.25rem;
  border-bottom: 1px solid var(--border-soft);
}
.tag-index__list li:last-child { border-bottom: none; }
.tag-index__list a {
  flex: 1;
  color: var(--text-primary);
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.tag-index__list a:hover { color: var(--accent); }
.tag-index__meta {
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  flex-shrink: 0;
  opacity: 0.8;
}

/* -------------------- Credentials Grid -------------------- */
.cred-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.cred-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.cred-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-raised);
  border-color: rgba(14, 165, 233, 0.2);
}
.cred-card__thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  display: block;
  background: var(--bg-muted);
}
.cred-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}
.cred-card:hover .cred-card__thumb img { transform: scale(1.04); }
.cred-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(12, 74, 110, 0.38), rgba(12, 74, 110, 0.12));
  color: #fff;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 0.8rem 0.9rem;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.cred-card:hover .cred-card__overlay { opacity: 1; }
.cred-card__body {
  padding: 1.1rem 1.35rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}
.cred-card__org {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-strong);
}
.cred-card__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-primary);
}
.cred-card__summary {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}
@media (max-width: 640px) {
  .cred-grid { grid-template-columns: 1fr; }
}
.dark-mode .cred-card { border-color: var(--border-soft); }
.dark-mode .cred-card:hover { border-color: rgba(125, 211, 252, 0.25); }
.dark-mode .cred-card__overlay {
  background: linear-gradient(to top, rgba(8, 47, 73, 0.55), rgba(8, 47, 73, 0.14));
}

/* -------------------- 404 Error Page -------------------- */
.error-page {
  text-align: center;
  padding: 4.5rem 2rem 5.5rem;
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}
.error-page__eyebrow {
  margin: 0 0 0.85rem;
  color: var(--text-secondary);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.error-page__code {
  font-size: clamp(5rem, 18vw, 9rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  background: linear-gradient(120deg, #0c4a6e, #0ea5e9 50%, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin: 0 0 0.5rem;
}
.error-page__title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.65rem;
  color: var(--text-primary);
}
.error-page__desc {
  color: var(--text-secondary);
  margin: 0 0 2rem;
  font-size: 0.95rem;
}
.error-page__actions {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  justify-content: center;
}
.error-page__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.18s ease, transform 0.18s ease;
}
.error-page__cta:hover {
  background: var(--accent-strong);
  color: #fff;
  transform: translateY(-1px);
}
.error-page__link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
}
.error-page__link:hover { color: var(--accent); }

/* -------------------- Diaries -------------------- */
.diaries__intro {
  margin: 0 0 0.35rem;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
  max-width: 62ch;
}

.diaries__intro > :first-child {
  margin-top: 0;
}

.diaries__intro > :last-child {
  margin-bottom: 0;
}

.diaries {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.diaries__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 0.9rem;
}

.diaries__title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.diaries__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.9rem;
  height: 1.9rem;
  padding: 0 0.55rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
}

.diaries__list {
  display: flex;
  flex-direction: column;
}

.log-entry {
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.1rem 1.35rem;
  margin-bottom: 0.65rem;
  transition: border-left-color 0.18s ease, box-shadow 0.18s ease;
}

.log-entry:hover,
.log-entry:focus-within {
  border-left-color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.log-entry__meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}

.log-entry__mood {
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.log-entry__title {
  margin: 0 0 0.3rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.log-entry__content {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

.log-entry__content p {
  margin: 0;
}

.diaries__pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 0.25rem;
}

.diaries__pagination-btn {
  border: 1px solid var(--border-soft);
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-radius: 999px;
  padding: 0.4rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.diaries__pagination-btn:not(:disabled):hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.diaries__pagination-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.diaries__pagination-status {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.diaries__empty {
  margin: 0;
  color: var(--text-secondary);
  font-style: italic;
  font-size: 0.9rem;
  padding: 1rem 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
}

@media (max-width: 640px) {
  .log-entry { padding: 0.9rem 1rem; }
}

.dark-mode .log-entry {
  background: var(--bg-elevated);
  border-color: var(--border-soft);
}

.dark-mode .log-entry:hover,
.dark-mode .log-entry:focus-within {
  border-left-color: var(--accent);
}

.dark-mode .diaries__count {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
}

.dark-mode .diaries__pagination-btn {
  background: var(--bg-elevated);
  border-color: var(--border-soft);
  color: var(--text-primary);
}

/* -------------------- Footer -------------------- */
.site-footer {
  background: var(--bg-body);
  color: var(--text-secondary);
  margin-top: 4rem;
  border-top: 1px solid var(--border-soft);
}
.site-footer__inner {
  padding: 1.25rem 0;
}
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.site-footer__bottom a {
  color: var(--text-secondary);
  transition: color 0.18s ease;
}
.site-footer__bottom a:hover { color: var(--accent); }

/* -------------------- Nav Theme Toggle -------------------- */
.nav-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  border: none;
  border-radius: var(--radius-md);
  background: none;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: none;
  transition: background 0.15s ease;
  padding: 0;
  flex-shrink: 0;
  line-height: 1;
  margin-left: 0.25rem;
}
.nav-theme-toggle:hover,
.nav-theme-toggle:focus-visible {
  background: rgba(15, 23, 42, 0.04);
  transform: none;
  box-shadow: none;
}
.dark-mode .nav-theme-toggle:hover,
.dark-mode .nav-theme-toggle:focus-visible {
  background: rgba(255, 255, 255, 0.04);
}
.nav-theme-toggle .icon-sun { display: none; }
.nav-theme-toggle .icon-moon { display: inline; }
.dark-mode .nav-theme-toggle .icon-sun { display: inline; }
.dark-mode .nav-theme-toggle .icon-moon { display: none; }

/* -------------------- Post Article -------------------- */
.post-layout {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 800px) 200px;
  gap: 2.5rem;
  align-items: start;
}

.post {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 3rem 3.35rem 3.1rem;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(15, 23, 42, 0.03);
  max-width: none;
  margin: 0;
}

.post-header {
  margin-bottom: 2.2rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid rgba(228, 228, 231, 0.7);
}

.post-header__top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.post-overline {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.post-overline--category {
  color: var(--accent-strong);
}

.post-overline__sep {
  color: var(--text-secondary);
  opacity: 0.6;
  font-size: 0.85rem;
}

.post-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--text-primary);
  margin: 0 0 1rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.post-meta__tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.post-meta__tag {
  padding: 0.12rem 0.5rem;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid rgba(15, 23, 42, 0.07);
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.post-meta__tag:hover { background: rgba(15, 23, 42, 0.03); color: var(--text-primary); border-color: rgba(15, 23, 42, 0.1); }

/* Post Content Typography */
.post-content {
  line-height: 1.8;
  font-size: 1.02rem;
}

.post-content > :first-child {
  margin-top: 0;
}

.post-content h2 {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin: 2.5rem 0 0.75rem;
  scroll-margin-top: 90px;
}

.post-content h3 {
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2rem 0 0.6rem;
  scroll-margin-top: 90px;
}

.post-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 1.75rem 0 0.5rem;
}

.post-content h2,
.post-content h3 {
  position: relative;
}

.post-anchor {
  margin-left: 0.45rem;
  color: var(--text-secondary);
  opacity: 0;
  text-decoration: none !important;
  transition: opacity 0.15s ease, color 0.15s ease;
  font-weight: 500;
}

.post-content h2:hover .post-anchor,
.post-content h3:hover .post-anchor,
.post-content h2:focus-within .post-anchor,
.post-content h3:focus-within .post-anchor {
  opacity: 1;
}

.post-anchor:hover {
  color: var(--accent);
}

.post-content p { margin: 0 0 1.25rem; }

.post-content > p:first-of-type {
  font-size: 1.12rem;
  line-height: 1.9;
  color: #52525b;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
.post-content a:hover { color: var(--accent-strong); }

.post-content blockquote {
  margin: 1.75rem 0;
  padding: 1rem 1.5rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.post-content blockquote p { color: var(--text-primary); margin: 0; }

.post-content :not(pre) > code {
  background: var(--bg-muted);
  padding: 0.2em 0.45em;
  border-radius: 5px;
  font-size: 0.875em;
  color: var(--accent);
  border: 1px solid var(--border-soft);
}

.post-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 1.75rem 0;
}

.post-content table {
  width: max-content;
  min-width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: 0.95rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  display: table;
  overflow: visible;
}

.post-content th {
  background: var(--bg-muted);
  padding: 0.65rem 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
  white-space: nowrap;
}

.post-content td {
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--border-soft);
}

.post-content img {
  border-radius: var(--radius-md);
  max-width: 100%;
  display: block;
  margin: 1.5rem auto;
}

.post-figure {
  margin: 1.75rem 0;
}

.post-figure img {
  margin: 0 auto;
}

.post-figure__caption {
  margin-top: 0.75rem;
  text-align: center;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.post-content .code-block {
  position: relative;
}

.post-content div.highlight.code-block {
  padding-top: 2.6rem;
}

.post-content pre {
  margin: 0;
  padding: 1rem 1.1rem;
  background: #f6f8fa;
  border: 1px solid #e6e6e6;
  border-radius: 12px;
  overflow-x: auto;
}

.post-content pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
}

.post-content .code-block:not(.highlight) > pre {
  padding-top: 2.9rem;
}

.post-content .highlight {
  margin-bottom: 1.25rem;
}

.post-content div.highlight,
.post-content .code-block.highlight {
  background: #f6f8fa !important;
  border: 1px solid #e6e6e6;
  border-radius: 12px;
  overflow: hidden;
}

.post-content pre.highlight,
.post-content .highlight > pre.highlight {
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  padding: 0 !important;
}

.post-content .highlight pre,
.post-content .code-block.highlight pre,
.post-content .highlight td.rouge-code > pre,
.post-content .highlight td.rouge-gutter > pre,
.post-content .highlight .lineno {
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  padding: 0 !important;
}

.post-content div.highlight.code-block .rouge-code > pre {
  padding: 0 0.75rem 0.9rem 0.75rem !important;
}

.post-content div.highlight.code-block .rouge-gutter > pre {
  padding: 0 0 0.9rem 0 !important;
}

.code-language-badge {
  position: absolute;
  top: 0.7rem;
  left: 0.8rem;
  display: inline-flex;
  align-items: center;
  height: 1.75rem;
  padding: 0 0.6rem;
  border-radius: 999px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--accent-strong);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  z-index: 2;
}

.code-copy-button {
  position: absolute;
  top: 0.7rem;
  right: 0.8rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.5rem;
  height: 1.75rem;
  padding: 0 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(14, 165, 233, 0.16);
  background: rgba(255, 255, 255, 0.86);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  z-index: 2;
}

.code-copy-button:hover,
.code-copy-button:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border-soft);
  margin: 2.5rem 0;
}

.post-content ul,
.post-content ol {
  padding-left: 1.5rem;
  margin: 0 0 1.25rem;
}

.post-content li + li { margin-top: 0.35rem; }

.post-toc {
  position: sticky;
  top: 102px;
}

.post-toc__inner {
  background: transparent;
  border: none;
  border-left: 1px solid rgba(228, 228, 231, 0.9);
  border-radius: 0;
  box-shadow: none;
  padding: 0.15rem 0 0.15rem 1rem;
}

.post-toc__title {
  margin: 0 0 0.7rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}

.post-toc__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.7rem;
}

.post-toc__head .post-toc__title {
  margin-bottom: 0;
}

.post-toc__toggle {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  padding: 0.2rem 0.35rem;
  border-radius: 8px;
}

.post-toc__toggle:hover,
.post-toc__toggle:focus-visible {
  background: transparent;
  color: var(--accent-strong);
}

.post-toc.is-collapsed .post-toc__nav {
  display: none;
}

.post-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

.post-toc__link {
  display: block;
  padding: 0.22rem 0;
  border-radius: 0;
  color: var(--text-secondary);
  font-size: 0.82rem;
  line-height: 1.45;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, padding 0.15s ease;
}

.post-toc__item--h3 .post-toc__link {
  padding-left: 0.8rem;
  font-size: 0.78rem;
}

.post-toc__link:hover,
.post-toc__link.is-active {
  background: transparent;
  color: var(--text-primary);
  border-left-color: var(--accent);
  padding-left: 0.35rem;
}

.post-toc__item--h3 .post-toc__link:hover,
.post-toc__item--h3 .post-toc__link.is-active {
  padding-left: 1rem;
}

@media (max-width: 1100px) {
  .post-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .post-toc {
    display: none;
  }
}

@media (max-width: 768px) {
  .post {
    padding: 1.75rem 1.5rem;
    border-radius: var(--radius-md);
  }

  .post-title { font-size: 1.55rem; }
}

.dark-mode .post { border-color: rgba(255, 255, 255, 0.06); }

.dark-mode .post-content :not(pre) > code {
  background: rgba(125, 211, 252, 0.1);
  color: #bae6fd;
  border-color: rgba(125, 211, 252, 0.2);
}

.dark-mode .post-content > p:first-of-type {
  color: #d6d3d1;
}

.dark-mode .post-content blockquote {
  background: rgba(125, 211, 252, 0.08);
  border-left-color: var(--accent);
}

.dark-mode .post-content blockquote p { color: var(--text-primary); }

.dark-mode .post-anchor {
  color: var(--text-secondary);
}

.dark-mode .post-overline--category {
  color: #bae6fd;
}

.dark-mode .post-meta__tag {
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
}

.dark-mode .post-meta__tag:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

.dark-mode .code-copy-button {
  background: rgba(8, 47, 73, 0.82);
  border-color: rgba(125, 211, 252, 0.18);
  color: #e0f2fe;
}

.dark-mode .post-content pre {
  background: #111827;
  border-color: rgba(255, 255, 255, 0.08);
}

.dark-mode .post-content .highlight,
.dark-mode .post-content .code-block.highlight {
  background: #111827 !important;
  border-color: rgba(255, 255, 255, 0.08);
}

.dark-mode .code-language-badge {
  background: rgba(125, 211, 252, 0.12);
  color: #e0f2fe;
}

.dark-mode .post-toc__inner {
  border-left-color: rgba(255, 255, 255, 0.08);
}

.dark-mode .post-toc__toggle:hover,
.dark-mode .post-toc__toggle:focus-visible {
  background: transparent;
  color: #e0f2fe;
}

.dark-mode .post-toc__link:hover,
.dark-mode .post-toc__link.is-active {
  background: transparent;
  color: var(--text-primary);
}

.dark-mode .print-article-button {
  background: rgba(125, 211, 252, 0.08);
  border-color: rgba(125, 211, 252, 0.2);
  color: #e0f2fe;
}

.dark-mode .print-article-button:hover,
.dark-mode .print-article-button:focus {
  background: rgba(125, 211, 252, 0.14);
  border-color: rgba(125, 211, 252, 0.28);
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 1.5px;
  z-index: 130;
  pointer-events: none;
}

.reading-progress__bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #38bdf8);
  box-shadow: 0 0 12px rgba(14, 165, 233, 0.35);
  transition: width 0.08s linear;
}

/* -------------------- Footer Simplified -------------------- */
.site-footer__sep {
  opacity: 0.4;
}

/* -------------------- Post Actions -------------------- */
.post-actions {
  margin: 2rem 0 0;
  display: flex;
  justify-content: flex-end;
}

.post-pagination {
  max-width: 1120px;
  margin: 1.25rem auto 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.post-pagination__link,
.post-pagination__spacer {
  min-height: 100%;
}

.post-pagination__link {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  padding: 0.9rem 0;
  border-radius: 0;
  border: none;
  border-top: 1px solid rgba(228, 228, 231, 0.8);
  background: transparent;
  box-shadow: none;
  text-decoration: none;
  transition: color 0.18s ease, opacity 0.18s ease, border-color 0.18s ease;
  position: relative;
}

.post-pagination__link:hover,
.post-pagination__link:focus-visible {
  border-top-color: rgba(14, 165, 233, 0.22);
  box-shadow: none;
  background: transparent;
}

.post-pagination__link--next {
  text-align: right;
  align-items: flex-end;
}

.post-pagination__arrow {
  font-size: 0.92rem;
  line-height: 1;
  color: var(--accent);
}

.post-pagination__link--prev .post-pagination__arrow {
  align-self: flex-start;
}

.post-pagination__link--next .post-pagination__arrow {
  align-self: flex-end;
}

.post-pagination__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.post-pagination__title {
  color: var(--text-primary);
  font-size: 0.94rem;
  font-weight: 500;
  line-height: 1.45;
}

.back-to-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  width: 2.6rem;
  height: 2.6rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(14, 165, 233, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--accent-strong);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease, background 0.18s ease, color 0.18s ease;
  z-index: 110;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--accent);
  color: #ffffff;
}

.print-article-button {
  border: 1px solid var(--accent);
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.print-article-button:hover,
.print-article-button:focus {
  background: rgba(14, 165, 233, 0.14);
  border-color: rgba(14, 165, 233, 0.28);
  box-shadow: 0 12px 22px -18px rgba(14, 165, 233, 0.45);
}

@page {
  size: A4 portrait;
  margin: 10mm 15mm;
}

@media print {
  html,
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  body {
    margin: 0;
  }

  .site-header,
  .site-footer,
  .post-actions,
  .post-pagination,
  .back-to-top,
  .reading-progress,
  #disqus_thread,
  .page-content > .wrapper > :not(.post):not(.post-layout) {
    display: none !important;
  }

  .page-content {
    padding: 0 !important;
    margin: 0 !important;
  }

  .wrapper {
    max-width: none !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .post {
    background: transparent !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin: 0 !important;
    color: #000000 !important;
  }

  .post-content,
  .post-content * {
    background: transparent !important;
    color: #000000 !important;
    box-shadow: none !important;
  }

  a,
  .post-content a {
    color: #000000 !important;
    text-decoration: underline;
  }

  .post-content table {
    width: 100% !important;
    table-layout: auto !important;
    display: table !important;
    overflow: visible !important;
    border-collapse: collapse !important;
  }

  .post-layout {
    display: block !important;
    max-width: none !important;
  }

  .post-toc {
    display: none !important;
  }

  .post-content table th,
  .post-content table td {
    white-space: normal !important;
    overflow: visible !important;
    word-break: break-word;
    padding: 0.4rem 0.5rem !important;
  }

  .post-content table mjx-container {
    display: inline-block !important;
    max-width: none !important;
    overflow: visible !important;
    white-space: nowrap !important;
    text-align: left !important;
  }

  .post-content table mjx-math {
    white-space: nowrap !important;
  }

  .post-content table.formula-table mjx-container {
    display: block !important;
    max-width: 100% !important;
    white-space: normal !important;
    overflow: visible !important;
    overflow-wrap: anywhere !important;
  }

  .post-content table.formula-table mjx-math {
    white-space: normal !important;
  }

  .post-content table.formula-table {
    table-layout: auto !important;
  }

  .post-content table.formula-table th:nth-child(1),
  .post-content table.formula-table td:nth-child(1) {
    width: 18% !important;
  }

  .post-content table.formula-table th:nth-child(2),
  .post-content table.formula-table td:nth-child(2) {
    width: 48% !important;
    word-break: normal;
    overflow-wrap: anywhere;
  }

  .post-content table.formula-table th:nth-child(3),
  .post-content table.formula-table td:nth-child(3) {
    width: 34% !important;
  }
}

@media (max-width: 768px) {
  .post-pagination {
    grid-template-columns: 1fr;
  }

  .post-pagination__link--next {
    text-align: left;
    align-items: flex-start;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

.dark-mode .post-pagination__link {
  border-top-color: rgba(255, 255, 255, 0.08);
}

.dark-mode .post-pagination__link:hover,
.dark-mode .post-pagination__link:focus-visible {
  border-top-color: rgba(125, 211, 252, 0.2);
  background: transparent;
}

.dark-mode .back-to-top {
  background: rgba(8, 47, 73, 0.9);
  border-color: rgba(125, 211, 252, 0.18);
  color: #e0f2fe;
}