/* ============================================================
   Haocun Ye — personal homepage stylesheet
   Warm-paper editorial design. Plain CSS, zero dependencies.

   Contents:
   1.  Self-hosted fonts (@font-face)
   2.  Design tokens (light / dark)
   3.  Reset & base typography
   4.  Layout utilities & section-head pattern
   5.  Header / navigation
   6.  Hero
   7.  News
   8.  Publications
   9.  Projects
   10. About
   11. Contact & footer
   12. Blog list
   13. Article pages
   14. No-JS fallbacks
   15. Reduced motion
   ============================================================ */

/* ===== 1. Self-hosted fonts (SIL OFL, see assets/fonts/OFL.txt) ===== */

@font-face {
  font-family: "Instrument Serif";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../assets/fonts/instrument-serif-latin.woff2") format("woff2");
}

@font-face {
  font-family: "Instrument Serif";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../assets/fonts/instrument-serif-latin-italic.woff2") format("woff2");
}

/* ===== 2. Design tokens ===== */

:root {
  /* Warm paper (light, default) */
  --color-bg: #faf6ee;
  --color-surface: #f2ecdf;
  --color-text: #201d17;
  --color-text-secondary: #6b6255;
  --color-border: #dfd6c5;
  --color-rule: #201d17; /* heavy section rules use ink, not border grey */
  --color-accent: #1a4d8f;
  --color-accent-hover: #143c72;
  --color-on-accent: #ffffff;
  --color-nav-bg: rgba(250, 246, 238, 0.8);
  --color-code-bg: #f1ebdc;
  --color-pill-bg: #eae2d0;

  /* Type */
  --font-serif: "Instrument Serif", ui-serif, Georgia, "Iowan Old Style",
    "Times New Roman", serif;
  --font-serif-cjk: "Songti SC", "STSong", "Noto Serif CJK SC", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
  --text-base: 17px;
  --leading: 1.7;

  /* Spacing (8px grid) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;

  /* Shape & layout */
  --radius: 6px;
  --radius-sm: 3px;
  --max-width: 1120px;
  --nav-height: 60px;
  --transition: 0.25s ease;
}

/* Manual dark (user locked via toggle) — warm ink night */
[data-theme="dark"] {
  --color-bg: #171511;
  --color-surface: #1e1b16;
  --color-text: #ede7db;
  --color-text-secondary: #a79e8d;
  --color-border: #423c31;
  --color-rule: #ede7db;
  --color-accent: #8fb4e3;
  --color-accent-hover: #a9c6ec;
  --color-on-accent: #0e2a50;
  --color-nav-bg: rgba(23, 21, 17, 0.8);
  --color-code-bg: #201d17;
  --color-pill-bg: #2c2820;
}

/* System dark (only when the user has not locked a theme) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --color-bg: #171511;
    --color-surface: #1e1b16;
    --color-text: #ede7db;
    --color-text-secondary: #a79e8d;
    --color-border: #423c31;
    --color-rule: #ede7db;
    --color-accent: #8fb4e3;
    --color-accent-hover: #a9c6ec;
    --color-on-accent: #0e2a50;
    --color-nav-bg: rgba(23, 21, 17, 0.8);
    --color-code-bg: #201d17;
    --color-pill-bg: #2c2820;
  }
}

/* ===== 3. Reset & base typography ===== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  /* keep anchored headings clear of the sticky nav */
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition), color var(--transition);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: 0.005em;
}

p {
  margin: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style-position: outside;
}

::selection {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

/* Small uppercase mono label — the editorial "eyebrow" */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

/* ===== 4. Layout utilities & section-head pattern ===== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.container.narrow {
  max-width: 720px;
}

.section {
  padding: var(--space-5) 0;
}

.section.alt {
  background-color: var(--color-surface);
  transition: background-color var(--transition);
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-6) 0;
  }
}

/* Section head: heavy ink rule + numbered mono eyebrow + serif title */
.section-head {
  border-top: 2px solid var(--color-rule);
  padding-top: var(--space-2);
  margin-bottom: var(--space-4);
}

.section-head .section-label {
  display: flex;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-head .section-no {
  color: var(--color-accent);
}

.section-head .section-eyebrow {
  color: var(--color-text-secondary);
}

.section-head .section-title {
  font-size: clamp(34px, 5vw, 52px);
  margin-top: 12px;
}

/* Visually hidden but available to screen readers (live regions etc.) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to content (keyboard users) */
.skip-link {
  position: absolute;
  top: -48px;
  left: var(--space-2);
  z-index: 200;
  padding: var(--space-1) var(--space-2);
  background: var(--color-accent);
  color: var(--color-on-accent);
  border-radius: var(--radius-sm);
  transition: top var(--transition);
}

.skip-link:focus {
  top: var(--space-1);
  color: var(--color-on-accent);
}

/* Scroll reveal (JS adds .visible; no-JS fallback in §14) */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

html:not(.js) .reveal {
  opacity: 1;
  transform: none;
}

/* ===== 5. Header / navigation ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--color-nav-bg);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition), border-color var(--transition);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  font-family: var(--font-serif);
  font-size: 21px;
  color: var(--color-text);
  white-space: nowrap;
}

.brand .brand-zh {
  font-family: var(--font-serif-cjk);
  color: var(--color-accent);
}

.brand:hover {
  color: var(--color-text);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Nav links: dropdown panel on mobile, mono row on desktop */
.site-nav {
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  display: none;
  flex-direction: column;
  padding: var(--space-1) 0 var(--space-2);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

body.nav-open .site-nav {
  display: flex;
}

.site-nav a {
  padding: 10px var(--space-3);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}

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

.site-nav a.active {
  color: var(--color-accent);
}

/* Hamburger (mobile only) */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.nav-toggle:hover {
  background-color: var(--color-pill-bg);
}

.nav-toggle .icon-close {
  display: none;
}

body.nav-open .nav-toggle .icon-menu {
  display: none;
}

body.nav-open .nav-toggle .icon-close {
  display: block;
}

/* Theme toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.theme-toggle:hover {
  background-color: var(--color-pill-bg);
}

/* Light shows the moon (= "switch to dark"); dark shows the sun */
.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle .icon-moon {
    display: none;
  }
}

@media (min-width: 768px) {
  .site-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    padding: 0;
    background: none;
    border: none;
  }

  .site-nav a {
    padding: 6px 10px;
    font-size: 13px;
    color: var(--color-text-secondary);
  }

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

  .site-nav a.active {
    color: var(--color-accent);
  }

  .nav-toggle {
    display: none;
  }
}

/* ===== 6. Hero ===== */

.hero {
  padding: var(--space-5) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: center;
}

.hero-kicker {
  display: block;
  margin-bottom: var(--space-3);
}

.hero-name {
  font-size: clamp(56px, 9vw, 104px);
  line-height: 0.95;
  letter-spacing: -0.015em;
}

.hero-name .hero-name-zh {
  display: block;
  margin-top: 10px;
  font-family: var(--font-serif-cjk);
  font-size: 0.42em;
  letter-spacing: 0.14em;
  color: var(--color-accent);
}

.hero-role {
  max-width: 34em;
  margin-top: var(--space-3);
  font-size: 17px;
  color: var(--color-text-secondary);
}

.hero-question {
  max-width: 24em;
  margin-top: var(--space-4);
  padding-left: 20px;
  border-left: 2px solid var(--color-accent);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.35;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.hero-links a {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--color-border);
}

.hero-links a:hover {
  text-decoration-color: currentColor;
}

/* Full-frame vertical portrait with an offset accent frame */
.hero-portrait {
  position: relative;
  isolation: isolate; /* keep the ::after frame inside this stacking context */
  width: 100%;
  max-width: 400px;
  margin: 0 14px 14px 0;
}

.hero-portrait img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
}

.hero-portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translate(14px, 14px);
  border: 2px solid var(--color-accent);
  z-index: -1;
}

@media (min-width: 900px) {
  .hero {
    padding: var(--space-6) 0;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-5);
  }

  .hero-portrait {
    max-width: none;
    justify-self: end;
  }
}

/* ===== 7. News ===== */

.news-list {
  list-style: none;
}

.news-item {
  padding: 14px 0;
  border-top: 1px solid var(--color-border);
}

.news-item time {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-secondary);
}

@media (min-width: 560px) {
  .news-item {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: var(--space-3);
  }

  .news-item time {
    padding-top: 2px;
  }
}

/* ===== 8. Publications ===== */

.pub-list {
  list-style: none;
}

.pub-item {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-border);
}

.pub-thumb img {
  display: block;
  width: 100%;
  /* height:auto 必须显式写:否则 HTML 的 height 属性会把图片
     拉成 200×720 的竖条;封面本身就是 16:9,完整显示即可 */
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.pub-thumb {
  margin-bottom: var(--space-2);
}

.pub-title {
  font-size: 23px;
  line-height: 1.25;
}

.pub-authors {
  margin-top: 6px;
  font-size: 15px;
  color: var(--color-text-secondary);
}

.pub-authors strong {
  color: var(--color-text);
  font-weight: 600;
}

.pub-venue {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 10px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.pub-note {
  margin-top: 10px;
  font-size: 15px;
  color: var(--color-text-secondary);
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.pub-bib {
  /* 作为 .pub-links 的 flex 子项:允许收缩,展开时独占一行,
     否则 pre 的 min-content 宽度会把整页撑出横向滚动 */
  min-width: 0;
  max-width: 100%;
}

.pub-bib[open] {
  flex-basis: 100%;
}

.pub-bib summary {
  cursor: pointer;
  color: var(--color-accent);
  list-style: none;
}

.pub-bib summary::-webkit-details-marker {
  display: none;
}

.pub-bib summary:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.pub-bib pre {
  margin-top: var(--space-2);
  padding: var(--space-2);
  max-width: 100%;
  overflow-x: auto;
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.5;
}

.pub-patent {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-border);
  font-size: 15px;
  color: var(--color-text-secondary);
}

.pub-patent .pub-venue {
  margin: 0 var(--space-2) 0 0;
}

.pub-patent em {
  color: var(--color-text);
}

@media (min-width: 768px) {
  .pub-item {
    display: grid;
    /* minmax(0,1fr):防止 BibTeX pre 的固有宽度把网格列撑破 */
    grid-template-columns: 280px minmax(0, 1fr);
    gap: var(--space-4);
    padding: var(--space-3) 0;
    /* 顶对齐:缩略图与标题齐平,不随行高拉伸 */
    align-items: start;
  }

  .pub-thumb {
    margin-bottom: 0;
  }

  .pub-item--no-thumb {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1080px) {
  .pub-item {
    grid-template-columns: 320px minmax(0, 1fr);
  }
}

/* ===== 9. Projects (alternating editorial rows) ===== */

.project-list {
  display: block;
}

.project-row {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
}

.project-media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.project-media {
  margin-bottom: var(--space-3);
}

.project-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.project-row h3 {
  font-size: 27px;
  line-height: 1.15;
}

.project-desc {
  margin-top: var(--space-2);
  font-size: 16px;
  color: var(--color-text-secondary);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-2);
  list-style: none;
}

.project-tags li {
  padding: 3px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}

.project-links {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 14px;
}

@media (min-width: 768px) {
  .project-row {
    display: grid;
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: var(--space-5);
    align-items: center;
    padding: var(--space-4) 0;
  }

  .project-media {
    margin-bottom: 0;
  }

  /* alternate media left / right */
  .project-row:nth-of-type(even) .project-media {
    order: 2;
  }
}

/* ===== 10. About ===== */

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.about-text {
  display: grid;
  gap: var(--space-2);
  max-width: 40em;
}

.about-text .about-lede {
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.45;
}

.about-facts {
  border-top: 1px solid var(--color-border);
}

.about-facts > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.about-facts dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.about-facts dd {
  font-size: 15px;
}

@media (min-width: 560px) {
  .about-facts > div {
    grid-template-columns: 190px 1fr;
    gap: var(--space-2);
  }

  .about-facts dt {
    padding-top: 3px;
  }
}

@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-5);
  }
}

/* ===== 11. Contact & footer ===== */

.contact-lede {
  max-width: 34em;
  color: var(--color-text-secondary);
}

.contact-email {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
}

.contact-email .email-text {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.4vw, 19px);
}

.copy-email {
  padding: 7px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: border-color var(--transition), color var(--transition);
}

.copy-email:hover,
.copy-email.copied {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.contact-alt {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-secondary);
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px var(--space-3);
  margin-top: var(--space-4);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 14px;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--color-border);
}

.social-links a:hover {
  text-decoration-color: currentColor;
}

.social-links svg {
  opacity: 0.65;
}

.site-footer {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 14px;
  transition: border-color var(--transition);
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

@media (min-width: 768px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ===== 12. Blog list ===== */

.page-header {
  padding: var(--space-5) 0 0;
}

.post-list {
  padding: var(--space-4) 0 var(--space-6);
}

.post-entry {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-border);
}

.post-entry time {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.post-entry h2 {
  font-size: 25px;
  line-height: 1.2;
}

.post-entry h2 a {
  color: var(--color-text);
}

.post-entry h2 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.post-entry .post-summary {
  margin-top: 8px;
  font-size: 15px;
  color: var(--color-text-secondary);
  overflow-wrap: break-word;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  list-style: none;
}

.post-tags li {
  padding: 2px 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

@media (min-width: 560px) {
  .post-entry {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: var(--space-3);
  }

  .post-entry time {
    margin-bottom: 0;
    padding-top: 5px;
  }
}

/* ===== 13. Article pages ===== */

.post {
  padding: var(--space-4) 0 var(--space-6);
}

.back-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-secondary);
}

.back-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.post-header {
  margin: var(--space-3) 0 var(--space-4);
  padding-top: var(--space-2);
  border-top: 2px solid var(--color-rule);
}

.post-header h1 {
  font-size: clamp(34px, 6vw, 50px);
  line-height: 1.1;
}

.post-meta {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-secondary);
}

.post-header .post-tags {
  margin-top: var(--space-2);
}

.post-body {
  overflow-wrap: break-word;
}

.post-body > * + * {
  margin-top: var(--space-2);
}

.post-body h2 {
  font-size: 30px;
  margin-top: var(--space-4);
}

.post-body h3 {
  font-size: 24px;
  margin-top: var(--space-3);
}

.post-body ul,
.post-body ol {
  padding-left: 1.5em;
}

.post-body li + li {
  margin-top: 6px;
}

.post-body blockquote {
  padding: var(--space-2) var(--space-3);
  border-left: 2px solid var(--color-accent);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 20px;
  line-height: 1.45;
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.post-body pre {
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  line-height: 1.6;
}

.post-body pre code {
  padding: 0;
  border: none;
  background: none;
  font-size: 14px;
}

.post-body figure {
  margin: var(--space-4) 0;
}

.post-body figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.post-body figcaption {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-4) 0;
}

.post-footer {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

/* ===== 14. No-JS fallbacks ===== */

/* Theme & menu buttons are dead without JS — hide them */
html:not(.js) .nav-toggle,
html:not(.js) .theme-toggle {
  display: none;
}

/* On mobile, show the nav inline instead of behind the hamburger */
@media (max-width: 767px) {
  html:not(.js) .site-header {
    height: auto;
    min-height: var(--nav-height);
  }

  html:not(.js) .site-header .container {
    height: auto;
    flex-wrap: wrap;
    padding-top: var(--space-1);
    padding-bottom: var(--space-1);
  }

  html:not(.js) .site-nav {
    position: static;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0;
    background: none;
    border: none;
  }

  html:not(.js) .site-nav a {
    padding: 4px 8px;
  }
}

/* ===== 15. Reduced motion ===== */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}