/* ===== NOTO FONTS (task-313: Noto Serif + Noto Sans Mono WOFF2 self-hosted, OFL-1.1 Fontsource latin-400 open-source only) ===== */
@font-face {
  font-family: "Noto Serif";
  src: url("../assets/fonts/noto-serif.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Noto Sans Mono";
  src: url("../assets/fonts/noto-sans-mono.woff2") format("woff2");
  font-display: swap;
}

/* ===== DESIGN TOKENS - VINTAGE/RETRO ===== */
:root {
  /* Light Mode (default) */
  --color-bg: #f5f5f5;
  --color-surface: #fafafa;
  --color-text: #000000;
  --color-text-secondary: #555555;
  --color-text-tertiary: #6f6f6f;
  --color-border: #dddddd;
  --color-border-hover: #aaaaaa;
  --color-primary: #333333;
  --color-primary-light: #eeeeee;
  --color-primary-lighter: #f0f0f0;

  /* Error tokens: WCAG AA small-text contrast on the light error-light surface. */
  --color-error: #b3261e;
  --color-error-light: #e8e8e8;
  --color-copy-error: #b3261e;
  --color-copy-error-dark: #ffb4ab;

  /* Typography - Noto Serif + Noto Sans Mono (OFL, self-hosted) */
  --font-serif: "Noto Serif", serif;
  --font-heading: "Noto Serif", serif;
  --font-mono: "Noto Sans Mono", monospace;

  /* Type scale: Perfect Fourth 1.333 (xs/sm bumped for readability, audit-8 B7) */
  --text-xs: 0.8125rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.333rem;
  --text-2xl: 1.563rem;
  --text-3xl: 1.953rem;
  --text-4xl: 2.441rem;

  /* Spacing - 4px base */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Borders */
  --radius-sm: 2px;
  --radius-md: 4px;

  /* Motion - vintage feel: deliberate, eased */
  --ease-retro: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;

  /* Layout */
  --content-width: 40rem;
  --max-width: 56rem;

  /* Component sizes (audit-2 B11) */
  --header-h: 56px;
  --btn-h: 36px;
  --copy-btn-h: 28px;
  --search-w-open: 160px;
  --search-w-closed: 0;
  --code-font-size: 0.85em;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-surface: #2a2a2a;
  --color-text: #ffffff;
  --color-text-secondary: #aaaaaa;
  --color-text-tertiary: #9a9a9a;
  --color-border: #4a4a4a;
  --color-border-hover: #666666;

  --color-primary: #cccccc;
  --color-primary-light: #333333;
  --color-primary-lighter: #3d3d3d;

  /* Error tokens: WCAG AA small-text contrast on the dark error-light surface. */
  --color-error: #e57373;
  --color-error-light: #2a2a2a;
  --color-copy-error: #b3261e;
  --color-copy-error-dark: #ffb4ab;
}

/* Native controls/scrollbars (zero-build, manual-toggle contract: audit-24 06):
   `color-scheme: dark` makes form inputs and scrollbars render in the dark
   scheme whenever the manual/adaptive dark theme is applied. Attribute-scoped,
   NOT a media query, so it follows data-theme (the persisted toggle), never
   the OS in isolation. */
html[data-theme="dark"] {
  color-scheme: dark;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--duration-slow) var(--ease-retro), color var(--duration-slow) var(--ease-retro);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
/* Post-body links (audit-15 A1): the global reset leaves markdown links
   visually identical to plain text until hover: the underline restores the
   WCAG 1.4.1 non-color cue inside post content only. No new colors; nav,
   footer, and breadcrumb link styles stay untouched. */
.post-content a { text-decoration: underline; }
button { font: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font: inherit; }
hr { border: none; border-top: 1px solid var(--color-border); margin: var(--space-6) 0; }

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

/* Skip-to-content link: visually hidden until keyboard focus (task-085 M6) */
.skip-link {
  position: absolute;
  left: -9999px;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link:focus {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg);
  color: var(--color-text);
  outline: 2px solid var(--color-primary);
  z-index: 1000;
}

/* Main focus indicator: visible when the skip link activates the region
   (task-095): same outline language as the rest of the site. */
main:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  border-radius: var(--radius-sm);
}

/* Native anchor fallback + programmatic scroll land below the sticky header
   (audit-6 B1): skip link target must never be covered. */
#main {
  scroll-margin-top: var(--header-h);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section-padding {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pageTurn {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.animate-in {
  animation: fadeInUp 0.6s var(--ease-retro) forwards;
}

.animate-in-d1 { animation-delay: 0.08s; }
.animate-in-d2 { animation-delay: 0.16s; }
.animate-in-d3 { animation-delay: 0.24s; }
.animate-in-d4 { animation-delay: 0.32s; }
.animate-in-d5 { animation-delay: 0.4s; }

.page-transition {
  animation: pageTurn 0.4s var(--ease-retro) both;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  animation: slideDown 0.4s var(--ease-retro) both;
  transition: background var(--duration-slow) var(--ease-retro), border-color var(--duration-slow) var(--ease-retro);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  padding-inline-start: 0;
  margin-inline-start: 0;
}

.nav-link {
  position: relative;
  padding: var(--space-2) 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-retro);
}

.nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}
.nav-link:active { opacity: 0.7; }
.nav-link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }
.nav-link[aria-current="page"] { color: var(--color-primary); text-shadow: 0 0 1px var(--color-primary); }

/* ===== HEADER CONTROLS - Theme + Language toggle buttons ===== */
.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ctrl-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--btn-h);
  height: var(--btn-h);
  color: var(--color-text-tertiary);
  background: transparent;
  cursor: pointer;
}

.ctrl-icon:hover {
  color: var(--color-primary);
}

.ctrl-icon:active { opacity: 0.7; }
.ctrl-icon:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Theme toggle - Sun/Moon visibility via data-theme attribute */
.ctrl-icon-theme .theme-sun { display: inline-flex; }
.ctrl-icon-theme .theme-moon { display: none; }
.ctrl-icon-theme[data-theme="dark"] .theme-sun { display: none; }
.ctrl-icon-theme[data-theme="dark"] .theme-moon { display: block; }

/* Language toggle - layered elements with opacity transition */
.ctrl-icon-lang { position: relative; }
/* Audit-6 S3/Q5: monolingual toggle hidden via class (no inline styles) */
.ctrl-icon-lang--hidden { display: none; }
.lang-globe,
.lang-text-second,
.lang-text-en {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.lang-globe { opacity: 1; }
.lang-text-second, .lang-text-en { opacity: 0; }
/* Audit-6 S3/Q5: flash visibility via classes: no inline styles under
   style-src 'self' (the class pattern keeps the CSP strict; style-src
   does not police element.style mutations, so inline style mutation is
   avoided by convention) */
.lang-globe--hidden { opacity: 0; }
.lang-text--visible { opacity: 1; }
.lang-text {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-tertiary);
}

/* ===== PAGE SECTIONS ===== */
.page-section {
  display: none;
  animation: fadeInUp 0.5s var(--ease-retro);
}

.page-section.active {
  display: block;
}

/* ===== POST LIST (replaces card grid) ===== */
.post-list {
  list-style: none;
}

.post-list-item {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
  transition: opacity var(--duration-fast) var(--ease-retro);
}

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

.post-list-item:last-child {
  border-bottom: none;
}

.post-list-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: opacity var(--duration-fast) var(--ease-retro);
}

.post-list-link:hover {
  text-decoration: none;
  opacity: 0.8;
}

.post-list-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.post-list-date {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.post-list-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-text);
  transition: color var(--duration-fast) var(--ease-retro);
}

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

.post-list-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-article .post-tags {
  margin-top: var(--space-8);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.post-article .post-tags summary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  list-style: none;
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) var(--ease-retro);
}

.post-article .post-tags summary::-webkit-details-marker {
  display: none;
}

.post-article .post-tags summary:hover {
  color: var(--color-text-secondary);
}

.post-article .post-tags summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.post-tags-chevron {
  display: inline-block;
  width: 0.5em;
  height: 0.5em;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transition: transform var(--duration-fast) var(--ease-retro);
}

details.post-tags[open] .post-tags-chevron {
  transform: rotate(45deg);
}

.post-article .post-tags-list {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== PAGINATION ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
}

/* Hidden attribute must win over display:flex (single page / no results) */
.pagination[hidden] {
  display: none;
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--btn-h); height: var(--btn-h);
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  font-family: var(--font-heading);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-retro);
}

.pagination-btn:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.pagination-btn:active { opacity: 0.7; }
.pagination-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.pagination-btn.active {
  color: var(--color-primary);
}

.pagination-btn:disabled,
.pagination-btn[aria-disabled="true"] {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.pagination-ellipsis {
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  padding: 0 var(--space-1);
  letter-spacing: 0.15em;
}

/* ===== SINGLE POST VIEW ===== */
.post-article {
  max-width: var(--content-width);
  margin: 0 auto;
}

.post-article .post-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.post-article .post-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.post-article .post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3);
  letter-spacing: 0.05em;
}

.post-article .post-meta-sep {
  color: var(--color-text-tertiary);
  opacity: 0.5;
}

.post-article .post-content {
  font-size: var(--text-base);
  line-height: 1.9;
  color: var(--color-text);
}

.post-article .post-content p {
  margin-bottom: var(--space-5);
}

/* Content images render as blocks: no inline baseline gaps (audit-8 B3).
   Markdown images lack semantic width/height, so height:auto (global rule)
   plus this display mode mitigate CLS: full aspect-ratio needs build-time
   dimensions (out of scope). */
.post-article .post-content img {
  display: block;
  margin-inline: auto;
}

.post-article .post-content h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.post-article .post-content h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 400;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
  font-style: normal;
}

.post-article .post-content h4 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 400;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.post-article .post-content h5 {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  margin-top: var(--space-5);
  margin-bottom: var(--space-1);
  color: var(--color-text);
}

.post-article .post-content h6 {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  margin-top: var(--space-4);
  margin-bottom: var(--space-1);
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-article .post-content strong {
  font-weight: 700;
  color: var(--color-text);
}

.post-article .post-content em {
  font-style: italic;
}

.post-article .post-content del,
.post-article .post-content s {
  text-decoration: line-through;
  color: var(--color-text);
}

/* Task list */
.post-article .post-content .task-list {
  list-style: none;
  padding-left: 0;
  margin: var(--space-4) 0;
}

.post-article .post-content .task-list-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.6;
}

.post-article .post-content .task-checkbox {
  width: 1em;
  height: 1em;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  flex-shrink: 0;
  margin-top: 0.3em;
  position: relative;
}

.post-article .post-content .task-checkbox.checked::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 0px;
  width: 6px;
  height: 10px;
  border: solid var(--color-primary);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.post-article .post-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding: var(--space-3) var(--space-5);
  margin: var(--space-5) 0;
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-text);
  font-size: var(--text-base);
  line-height: 1.7;
  transition: background var(--duration-slow) var(--ease-retro);
}

.post-article .post-content blockquote p {
  margin-bottom: var(--space-2);
}

.post-article .post-content blockquote p:last-child {
  margin-bottom: 0;
}

.post-article .post-content code {
  font-family: var(--font-mono);
  font-size: var(--code-font-size);
  background: var(--color-surface);
  padding: 1px var(--space-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: background var(--duration-slow) var(--ease-retro);
}

.post-article .post-content pre {
  position: relative;
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--space-5) 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  border: 1px solid var(--color-border);
  transition: background var(--duration-slow) var(--ease-retro);
}

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

/* Code block copy button */
/* Audit-6 S3/Q5: the wrapping pre gets .code-block-with-copy (position:
   relative) when the button is appended: class-based, no inline style */
.code-block-with-copy { position: relative; }
.code-copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: var(--copy-btn-h);
  height: var(--copy-btn-h);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-retro),
              color var(--duration-fast) var(--ease-retro);
}

.post-article .post-content pre:hover .code-copy-btn {
  opacity: 1;
}

.code-copy-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.code-copy-btn.copied {
  color: var(--color-primary);
}

/* Audit-8 B8: copy-failure feedback: class-based error state, CSP-safe.
   Opacity forced to 1 so the temporary state is visible without hover
   (touch devices, mouse moved away). Red per theme, WCAG AA: #b3261e on
   light surface 6.26:1, #ffb4ab on dark surface 8.45:1. */
.code-copy-btn--error {
  color: var(--color-copy-error);
  opacity: 1;
}

[data-theme="dark"] .code-copy-btn--error {
  color: var(--color-copy-error-dark);
}

/* Markdown tables (task-112) */
.post-article .post-content table {
  border-collapse: collapse;
  width: 100%;
  margin: var(--space-4) 0 var(--space-6);
}

.post-article .post-content th,
.post-article .post-content td {
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
  text-align: left;
  vertical-align: top;
}

.post-article .post-content th {
  background: var(--color-surface);
  color: var(--color-text-secondary);
}

.post-article .post-content ul,
.post-article .post-content ol {
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
  color: var(--color-text);
  font-size: var(--text-base);
  line-height: 1.9;
}

/* Breadcrumb */
.breadcrumb {
  margin-bottom: var(--space-5);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  letter-spacing: 0.05em;
}

.breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-retro);
}
.breadcrumb a:hover { color: var(--color-primary); text-decoration: none; }
.breadcrumb-sep {
  margin: 0 var(--space-2);
  opacity: 0.4;
}

/* ===== ABOUT PAGE ===== */
.about-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-10);
  max-width: var(--max-width);
  margin: 0 auto;
  align-items: start;
}

.about-photo-area {
  position: relative;
}

.about-photo-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  background: var(--color-primary-lighter);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: border-color var(--duration-fast) var(--ease-retro);
}

.about-photo {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* task-110: with a loaded photo, hide the initials (visibility: no layout
   shift; the old opaque-cover assumption was unreliable for transparency) */
.about-photo-frame.photo-loaded .about-initials {
  visibility: hidden;
}

.about-photo-frame:hover {
  border-color: var(--color-primary);
}

.about-initials {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 400;
  color: var(--color-primary);
  opacity: 0.3;
  user-select: none;
}

.about-content h1 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
}

.about-content .bio {
  font-size: var(--text-sm);
  line-height: 1.9;
  color: var(--color-text);
}

.about-content .bio ul,
.about-content .bio ol {
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
}

.about-content .bio li {
  margin-bottom: var(--space-1);
}

.about-content .bio p {
  margin-bottom: var(--space-4);
}


/* ===== ERROR STATE ===== */
.error-message {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-error-light);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-sm);
  color: var(--color-error);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  animation: fadeIn 0.3s var(--ease-retro);
  transition: background var(--duration-slow) var(--ease-retro);
}

/* ===== LOADING ===== */
.spinner {
  width: 16px; height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-6);
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
  margin-top: var(--space-10);
  transition: border-color var(--duration-slow) var(--ease-retro);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  letter-spacing: 0.04em;
}

.footer-socials {
  display: flex;
  gap: var(--space-2);
}

.footer-social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) var(--ease-retro);
}

/* Networks disabled in settings start hidden in the static markup and are
   revealed by the sync (class toggle: no inline style, no flash). */
.footer-social--hidden { display: none; }

.footer-social:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.footer-social:active { opacity: 0.7; }
.footer-social:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.footer-social svg {
  width: 15px;
  height: 15px;
}

/* ===== FOCUS VISIBLE ===== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ===== RESPONSIVE - TABLET 768px ===== */
@media (min-width: 768px) {
  .about-layout {
    grid-template-columns: 200px 1fr;
  }

  .post-article .post-title {
    font-size: var(--text-4xl);
  }

  .section-padding {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* ===== RESPONSIVE - DESKTOP 1024px+ ===== */
@media (min-width: 1024px) {
  .about-layout {
    grid-template-columns: 220px 1fr;
  }

  .section-padding {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
  }
}

/* ===== RESPONSIVE - MOBILE up to 767px ===== */
@media (max-width: 767px) {

  .header-inner { gap: var(--space-2); }
  .header-controls { gap: 2px; }
  .main-nav { gap: var(--space-2); font-size: var(--text-sm); }
  .nav-link { font-size: var(--text-sm); }

  .container {
    padding: 0 var(--space-4);
  }

  .about-layout {
    grid-template-columns: 1fr;
    padding-top: var(--space-8);
  }

  .archive-toolbar,
  .post-article {
    padding-top: var(--space-8);
  }

  .about-photo-frame {
    max-width: 160px;
    margin: 0 auto;
  }

  .post-article .post-title {
    font-size: var(--text-2xl);
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== PRINT ===== */
@media print {
  .site-header, .site-footer { display: none; }
  .page-section:not(.active) { display: none !important; }
  body { background: white; color: black; }
  .post-list-link { opacity: 1 !important; }
}

/* ===== SORT CONTROL ===== */
.archive-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  z-index: 1;
}

.sort-control {
  position: relative;
  display: inline-flex;
}

.sort-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0;
  height: var(--btn-h);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  cursor: pointer;
  color: var(--color-text-tertiary);
  transition: color var(--duration-base) var(--ease-retro), background var(--duration-base) var(--ease-retro), border-color var(--duration-base) var(--ease-retro), padding var(--duration-base) var(--ease-retro);
}

.sort-btn:hover {
  color: var(--color-primary);
}

.sort-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sort-btn-icon {
  flex-shrink: 0;
  display: block;
}

.sort-btn-label {
  overflow: hidden;
  width: auto;
  max-width: 0;
  opacity: 0;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: max-width var(--duration-base) var(--ease-retro), opacity var(--duration-fast) var(--ease-retro);
}

/* === ACTIVE STATE (button transforms + menu appears) === */
.sort-control.active .sort-btn {
  padding: 0 var(--space-3);
  border-color: var(--color-border);
  background: var(--color-primary-lighter);
  color: var(--color-text-secondary);
}

.sort-control.active .sort-btn-label {
  width: auto;
  max-width: 12ch;
  opacity: 1;
  text-align: left;
}

/* === FLOATING MENU === */
.sort-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 100%;
  background: var(--color-primary-lighter);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--duration-base) var(--ease-retro), transform var(--duration-base) var(--ease-retro), background var(--duration-base) var(--ease-retro), backdrop-filter var(--duration-base) var(--ease-retro), -webkit-backdrop-filter var(--duration-base) var(--ease-retro);
  box-shadow: 0 3px 12px rgba(0,0,0,0.1);
  pointer-events: none;
}

.sort-control.active .sort-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  background: color-mix(in srgb, var(--color-primary-lighter) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.sort-opt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-retro), background var(--duration-fast) var(--ease-retro);
}

.sort-opt:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.sort-opt:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.sort-opt + .sort-opt {
  border-top: 1px solid var(--color-border);
}

/* Selected option (primary + semibold; aria-current carries the semantics) */
.sort-opt.selected {
  color: var(--color-primary);
  font-weight: 600;
}

/* ===== SEARCH CONTROL ===== */
.search-control {
  position: relative;
  display: inline-flex;
}

.search-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0;
  height: var(--btn-h);
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  cursor: text;
  color: var(--color-text-tertiary);
  transition: color var(--duration-base) var(--ease-retro), background var(--duration-base) var(--ease-retro), padding var(--duration-base) var(--ease-retro);
}

.search-btn:hover {
  color: var(--color-primary);
}

.search-btn-icon {
  flex-shrink: 0;
  display: block;
}

.search-btn-input {
  overflow: hidden;
  width: var(--search-w-closed);
  opacity: 0;
  white-space: nowrap;
  border: none;
  background: transparent;
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text);
  outline: none;
  transition: width var(--duration-base) var(--ease-retro), opacity var(--duration-fast) var(--ease-retro);
}

.search-btn-input::placeholder {
  color: var(--color-text-tertiary);
  font-style: italic;
}

/* === ACTIVE STATE === */
.search-control.active .search-btn {
  outline: 1px solid var(--color-primary);
  outline-offset: 0px;
  padding: 0 var(--space-3);
  background: var(--color-primary-lighter);
  cursor: text;
}

.search-control.active .search-btn-input {
  width: var(--search-w-open);
  opacity: 1;
  cursor: text;
}

.search-no-results {
  text-align: center;
  padding: var(--space-8) 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  color: var(--color-text-tertiary);
  /* Audit-6 S3/Q5: hidden by default via CSS: the static HTML carries no
     inline style attribute (CSP style-src 'self') */
  display: none;
}

/* Audit-6 S3/Q5: shown via class toggle (no inline styles) */
.search-no-results--visible {
  display: block;
}

/* Math rendering (task-322): LaTeX typesetting is owned by self-hosted
   MathJax 3 (src/assets/vendor/mathjax/). The bundle's CHTML layout and
   @font-face rules ship as the static same-origin chtml.css next to the
   script, lazy-linked only on pages with math - no site CSS involved. */