/* ==============================
   1. CSS Custom Properties
   ============================== */
:root {
  --color-bg:          #F6F3EE;
  --color-bg-alt:      #EDE9E3;
  --color-text:        #2C2C2C;
  --color-text-muted:  #6B6560;
  --color-text-subtle: #9B9590;
  --color-accent:      #8B4513;
  --color-border:      #DDD8D0;
  --color-link:        #5B4A3F;
  --color-link-hover:  #8B4513;
  --color-code-bg:     #EDEAE5;
  --color-selection:   #D4C5B2;

  --font-body: "Merriweather", "Georgia", "Times New Roman", serif;
  --font-ui:   "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "Courier New", monospace;

  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  2rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  --max-width-content: 38rem;
  --max-width-site:    64rem;
  --border-radius:     2px;
  --transition-fast:   150ms ease;
}

/* ==============================
   2. Reset / Base
   ============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background-color: var(--color-selection);
  color: var(--color-text);
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==============================
   3. Typography
   ============================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--color-text);
}

h1 { font-size: 2.25rem; margin-top: var(--space-xl);  margin-bottom: var(--space-md); }
h2 { font-size: 1.625rem; margin-top: var(--space-lg); margin-bottom: var(--space-sm); }
h3 { font-size: 1.25rem;  margin-top: var(--space-lg); margin-bottom: var(--space-sm); }
h4 { font-size: 1.1rem;   margin-top: var(--space-md); margin-bottom: var(--space-xs); }

p {
  margin-bottom: 1.5rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-link-hover);
  text-decoration-color: var(--color-link-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--border-radius);
}

strong { font-weight: 600; }
em     { font-style: italic; }

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  width: 3rem;
  margin: var(--space-lg) auto;
}

/* ==============================
   4. Layout
   ============================== */
.site-wrapper {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  width: 100%;
}

main {
  flex: 1;
  padding: var(--space-xl) 0 var(--space-2xl);
}

.content-narrow {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

/* ==============================
   5. Navigation
   ============================== */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.site-header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.site-title {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-text);
}

.site-title:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.site-title .kanji {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-left: var(--space-xs);
  font-weight: 400;
}

.site-nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.site-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-nav a {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-text);
}

.site-nav a[aria-current="page"] {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
}

/* ==============================
   6. Post List
   ============================== */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list-item {
  padding: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
}

.post-list-item:first-child {
  padding-top: 0;
}

.post-list-link {
  display: block;
  padding: var(--space-lg) 0;
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin-left: calc(-1 * var(--space-md));
}

.post-list-link:hover {
  border-left-color: var(--color-accent);
  background-color: var(--color-bg-alt);
  padding-left: var(--space-lg);
  margin-left: calc(-1 * var(--space-lg));
}

.post-list-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

@media (max-width: 640px) {
  .post-list-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }
}

.post-list-meta {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  white-space: nowrap;
  flex-shrink: 0;
}

.post-list-meta time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-subtle);
  letter-spacing: 0.02em;
}

.post-list-reading {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.post-list-title {
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0;
  color: var(--color-text);
  flex: 1;
  position: relative;
}

.post-list-title::after {
  content: " →";
  color: var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

/* Mobile: show arrow on active (click) */
@media (max-width: 640px) {
  .post-list-link:active .post-list-title::after {
    opacity: 1;
  }
}

/* Desktop: show arrow on hover */
@media (min-width: 641px) {
  .post-list-link:hover .post-list-title::after {
    opacity: 1;
  }
}

.post-list-link:hover .post-list-title {
  color: var(--color-accent);
}

.post-list-summary {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-sm);
}


/* ==============================
   7. Article / Single Post
   ============================== */
.article-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.article-breadcrumb {
  margin-bottom: var(--space-md);
}

.article-breadcrumb a {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-subtle);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.article-breadcrumb a:hover {
  color: var(--color-accent);
}

.article-title {
  font-size: 2.25rem;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-top: 0;
  margin-bottom: var(--space-md);
}

.article-meta {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-text-subtle);
  letter-spacing: 0.04em;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.article-meta time {
  color: var(--color-text-muted);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.article-meta span::before {
  content: "·";
  color: var(--color-border);
}

.article-summary {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-top: var(--space-md);
  font-style: italic;
}

.article-body {
  margin-top: var(--space-xl);
}

.article-body p {
  margin-bottom: 1.4em;
}

.article-body h2,
.article-body h3,
.article-body h4 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.article-footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.article-footer-back {
  margin-top: var(--space-sm);
}

.article-back-link {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-text-subtle);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--transition-fast);
}

.article-back-link:hover {
  color: var(--color-accent);
}

/* Tags */
.tag {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 2px 8px;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.tag:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  text-decoration: none;
}

/* Prev / Next navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.post-nav-item {
  display: flex;
  flex-direction: column;
}

.post-nav-item.next {
  text-align: right;
}

.post-nav-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  height: 100%;
}

.post-nav-card:hover {
  border-color: var(--color-accent);
  background-color: var(--color-bg-alt);
}

.post-nav-label {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-subtle);
}

.post-nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
  transition: color var(--transition-fast);
}

.post-nav-card:hover .post-nav-title {
  color: var(--color-accent);
}

.post-nav-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-subtle);
  margin-top: auto;
  padding-top: var(--space-xs);
}

/* ==============================
   8. Code & Syntax Highlighting
   ============================== */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-code-bg);
  padding: 1px 5px;
  border-radius: var(--border-radius);
}

pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: 1.5rem;
  line-height: 1.55;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  border-radius: 0;
}

/* ==============================
   9. Blockquote & Figures
   ============================== */
blockquote {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-sm) var(--space-lg);
  margin: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 0;
}

figure {
  margin: var(--space-lg) 0;
}

figcaption {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--color-text-subtle);
  text-align: center;
  margin-top: var(--space-sm);
  letter-spacing: 0.02em;
}

/* ==============================
   9b. Tables
   ============================== */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.88rem;
}

.article-body th {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 2px solid var(--color-border);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.article-body td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-bg-alt);
  color: var(--color-text);
  vertical-align: top;
}

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

/* ==============================
   10. Table of Contents
   ============================== */
.toc {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-xl);
  font-size: 0.88rem;
}

.toc-title {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-sm);
}

.toc nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc nav ul ul {
  padding-left: var(--space-md);
  margin-top: 0.2rem;
  margin-bottom: 0;
}

.toc nav li {
  margin-bottom: 0.3rem;
}

.toc nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

.toc nav a:hover {
  color: var(--color-accent);
}

/* ==============================
   11. Archive
   ============================== */
.archive-total {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xl);
}

.archive-group {
  margin-bottom: var(--space-xl);
}

.archive-year-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-accent);
}

.archive-year {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0;
}

.archive-year-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-subtle);
  background-color: var(--color-bg-alt);
  padding: 2px 8px;
  border-radius: var(--border-radius);
}

.archive-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.archive-item {
  border-bottom: 1px solid var(--color-border);
}

.archive-item-link {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
  padding-left: var(--space-sm);
  margin-left: calc(-1 * var(--space-sm));
}

.archive-item-link:hover {
  border-left-color: var(--color-accent);
  background-color: var(--color-bg-alt);
  padding-left: var(--space-md);
  margin-left: calc(-1 * var(--space-md));
}

.archive-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-subtle);
  white-space: nowrap;
}

.archive-title {
  font-size: 0.95rem;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.archive-item-link:hover .archive-title {
  color: var(--color-accent);
}

.archive-reading {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  text-align: right;
}

/* ==============================
   12. Footer
   ============================== */
/* ==============================
   12. Footer
   ============================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: auto;
}

.site-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

/* Branding */
.site-footer-logo {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: var(--space-sm);
}

.site-footer-logo:hover {
  color: var(--color-accent);
}

.site-footer-tagline {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-text-subtle);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.site-footer-social {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.site-footer-social a {
  color: var(--color-text-subtle);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
}

.site-footer-social a:hover {
  color: var(--color-accent);
}

/* Sections */
.site-footer-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.site-footer-section-title {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.site-footer-nav-link {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
}

.site-footer-nav-link:hover {
  color: var(--color-accent);
}

.site-footer-meta {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-xs);
}

.site-footer-meta a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-footer-meta a:hover {
  color: var(--color-accent);
}

/* Bottom bar */
.site-footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-subtle);
}

/* Responsive footer */
@media (max-width: 768px) {
  .site-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .site-footer-brand {
    grid-column: 1 / -1;
  }
}

/* ==============================
   13. Page headers (about, archive, etc.)
   ============================== */
.page-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  font-weight: 600;
  margin-top: 0;
  letter-spacing: -0.015em;
}

.page-description {
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
  font-style: italic;
}

/* ==============================
   14. Home page
   ============================== */
.home-intro {
  max-width: var(--max-width-content);
  margin: 0 auto var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.home-intro-text {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.home-intro-text strong {
  color: var(--color-text);
}

.home-section-title {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-lg);
  max-width: var(--max-width-content);
  margin-left: auto;
  margin-right: auto;
}

.home-latest-section {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.home-latest-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.home-latest-header .home-section-title {
  margin-bottom: 0;
  flex: 1;
}

.home-latest-link {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.home-latest-link:hover {
  color: var(--color-accent);
}

/* ==============================
   15. 404
   ============================== */
.not-found {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.not-found-code {
  font-family: var(--font-mono);
  font-size: 5rem;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: var(--space-lg);
}

.not-found-message {
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

/* ==============================
   16. Pagination
   ============================== */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-ui);
  font-size: 0.82rem;
}

.pagination a {
  color: var(--color-text-muted);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.pagination a:hover {
  color: var(--color-accent);
}

.pagination-info {
  color: var(--color-text-subtle);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

/* ==============================
   17. Terms (tags/categories list)
   ============================== */
.terms-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.terms-list-item a {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 4px 12px;
  transition: all var(--transition-fast);
}

.terms-list-item a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.terms-list-count {
  font-size: 0.7em;
  color: var(--color-text-subtle);
}

/* ==============================
   18. Utility
   ============================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-bg);
  color: var(--color-accent);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  z-index: 100;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ==============================
   19. Print Styles
   ============================== */
@media print {
  .site-header,
  .site-footer,
  .post-nav,
  .toc,
  .pagination {
    display: none !important;
  }

  body {
    font-size: 12pt;
    background: white;
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .article-title {
    font-size: 24pt;
  }
}

/* ==============================
   20. Dark Mode
   ============================== */

/* Auto: dark vars applied when system is dark, unless user chose light */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:          #1C1B19;
    --color-bg-alt:      #242320;
    --color-text:        #D4CFC8;
    --color-text-muted:  #8A8580;
    --color-text-subtle: #7A7570;
    --color-accent:      #C4956A;
    --color-border:      #333330;
    --color-link:        #A8917E;
    --color-link-hover:  #C4956A;
    --color-code-bg:     #242420;
    --color-selection:   #3D3530;
  }
}

/* Manual dark override (even if system is light) */
:root[data-theme="dark"] {
  --color-bg:          #1C1B19;
  --color-bg-alt:      #242320;
  --color-text:        #D4CFC8;
  --color-text-muted:  #8A8580;
  --color-text-subtle: #7A7570;
  --color-accent:      #C4956A;
  --color-border:      #333330;
  --color-link:        #A8917E;
  --color-link-hover:  #C4956A;
  --color-code-bg:     #242420;
  --color-selection:   #3D3530;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: none;
  border-left: 1px solid var(--color-border);
  cursor: pointer;
  padding: 0 var(--space-md);
  margin-left: var(--space-md);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
  line-height: 1;
}

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

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--border-radius);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.theme-icon-sun,
.theme-icon-moon {
  transition: opacity var(--transition-fast);
}

/* Show sun by default (light mode) */
.theme-icon-sun {
  opacity: 1;
}

.theme-icon-moon {
  opacity: 0;
}

/* Dark mode: show moon */
[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
}

[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
}

/* ==============================
   21. Responsive / Mobile
   ============================== */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .site-wrapper {
    padding: 0 var(--space-md);
  }

  .site-header-inner {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .site-nav {
    gap: var(--space-md);
  }

  h1, .article-title {
    font-size: 1.75rem;
  }

  .archive-item-link {
    grid-template-columns: 3.5rem 1fr;
  }

  .archive-reading {
    display: none;
  }

  .post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav-item.next {
    text-align: left;
  }

  .site-footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}