/* ==========================================================================
   jme.log — site styles
   A research journal on newsprint: warm paper, carbon ink, crimson accent.
   Newsreader carries all editorial text; IBM Plex Sans handles interface
   labels and metadata. Light theme only.
   ========================================================================== */

/* --- 1. Tokens ----------------------------------------------------------- */
:root {
  /* Type */
  --font-serif: 'Newsreader', 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --font-prose: var(--font-serif);
  --font-sans: 'IBM Plex Sans', 'Helvetica Neue', Arial, system-ui, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;

  /* Palette */
  --bg-color: #fbf9f4;        /* paper */
  --bg-secondary: #f3efe6;    /* inset paper */
  --bg-card: #fffefb;         /* sheet */
  --text-color: #1b1a17;      /* carbon ink */
  --text-muted: #4f4a43;      /* graphite */
  --text-light: #716b62;      /* pencil, for metadata */
  --border-color: #ddd6c8;    /* hairline */
  --border-dark: #1b1a17;     /* heavy rule */
  --accent-color: #8b1c1c;    /* crimson */
  --accent-hover: #6b1414;
  --accent-tint: #f6e9e6;
  --accent-navy: #23405f;
  --accent-green: #2d6a4a;
  --code-bg: #efeadf;
  --code-text: #6b1414;

  --shadow-sm: 0 1px 2px rgba(27, 26, 23, 0.05);
  --shadow-md: 0 2px 10px rgba(27, 26, 23, 0.07);
  --shadow-lg: 0 18px 50px rgba(27, 26, 23, 0.18);

  /* Layout */
  --measure: 44rem;           /* reading column */
  --wide: 72rem;              /* header, footer, home index */
  --gutter: clamp(1.15rem, 4vw, 2.5rem);
  --radius: 3px;

  /* Rhythm */
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;        /* body prose */
  --step-2: 1.5rem;
  --step-3: 2rem;
  --step-4: clamp(2.1rem, 1.6rem + 2.2vw, 3.1rem);
}

/* --- 2. Base ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

* { margin: 0; padding: 0; }

html {
  font-size: 100%;
  background-color: var(--bg-color);
  color: var(--text-color);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 1rem;
}

body {
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-optical-sizing: auto;
  font-variant-numeric: oldstyle-nums proportional-nums;
}

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

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--accent-color) 55%, transparent);
  text-underline-offset: 0.18em;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 3px;
  border-radius: 1px;
}

::selection { background: #ecd4cf; color: var(--text-color); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 1100;
  padding: 0.5rem 0.9rem;
  background: var(--text-color);
  color: var(--bg-color);
  font-family: var(--font-sans);
  font-size: var(--step--1);
  text-decoration: none;
}
.skip-link:focus { top: 1rem; color: var(--bg-color); }

.container {
  width: 100%;
  max-width: calc(var(--measure) + 2 * var(--gutter));
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container-wide { max-width: calc(var(--wide) + 2 * var(--gutter)); }
.container-post { max-width: calc(var(--measure) + 2 * var(--gutter)); }

.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3.5rem, 8vw, 6rem);
}

.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background-color: var(--accent-color);
  z-index: 1000;
}
.is-page .reading-progress-bar { display: none; }

/* --- 3. Header ----------------------------------------------------------- */
.site-header {
  border-bottom: 3px double var(--border-dark);
  background: var(--bg-color);
}

.header-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2.5rem;
  padding-top: 1.6rem;
  padding-bottom: 1.1rem;
}

.wordmark {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  text-decoration: none;
  color: var(--text-color);
}
.wordmark:hover { color: var(--text-color); }

.wordmark-name {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 72;
}
.wordmark:hover .wordmark-name { color: var(--accent-color); }

.wordmark-tag {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text-light);
  letter-spacing: 0.01em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem 1.6rem;
  list-style: none;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 0.3rem 0;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.nav-link:hover { color: var(--text-color); }
.nav-link[aria-current="page"] {
  color: var(--text-color);
  border-bottom-color: var(--accent-color);
}
.nav-link-feed { color: var(--accent-color); }
.nav-link-feed:hover { color: var(--accent-hover); }

/* --- 4. Shared page elements ---------------------------------------------- */
.page-header {
  margin-bottom: clamp(2.25rem, 5vw, 3.25rem);
}

.page-title {
  font-family: var(--font-serif);
  font-size: var(--step-4);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 72;
  text-wrap: balance;
}

.page-lede {
  margin-top: 0.9rem;
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--text-muted);
  max-width: 38em;
}

.section-heading {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--text-color);
  padding-bottom: 0.6rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-dark);
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.15rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  color: #fff;
  background: var(--accent-color);
  border: 1px solid var(--accent-color);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color 0.15s ease;
}
.button:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }

.text-link {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--accent-color);
}

.empty-state {
  list-style: none;
  padding: 2.5rem 1.5rem;
  text-align: center;
  border: 1px dashed var(--border-color);
  color: var(--text-muted);
}
.empty-state h3 { font-size: var(--step-2); font-weight: 500; margin-bottom: 0.4rem; color: var(--text-color); }

/* --- 5. Home: introduction & paper index ---------------------------------- */
.intro {
  max-width: 50rem;
  margin-bottom: clamp(3rem, 8vw, 5rem);
}

.intro-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 1.4rem + 3.4vw, 3.75rem);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-variation-settings: "opsz" 72;
  text-wrap: balance;
}

.intro-text {
  margin-top: 1.25rem;
  max-width: 36em;
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.index-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-dark);
}

.index-title {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 600;
}

.index-count {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--text-light);
}

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

.paper {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: 0.75rem 3rem;
  padding: clamp(2rem, 4vw, 2.75rem) 0;
  border-bottom: 1px solid var(--border-color);
}
.paper:last-child { border-bottom: 0; }

.paper-margin {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  line-height: 1.45;
  padding-top: 0.45rem;
}

.paper-date { color: var(--text-color); font-weight: 500; display: block; }

.paper-fields {
  list-style: none;
  margin-top: 0.35rem;
  color: var(--accent-color);
}

.paper-body { max-width: 46rem; }

.paper-title {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

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

.paper-title-main {
  display: block;
  font-size: clamp(1.7rem, 1.35rem + 1.3vw, 2.35rem);
  font-variation-settings: "opsz" 60;
  transition: color 0.15s ease;
}

.paper-title-sub {
  display: block;
  margin-top: 0.4rem;
  font-size: 1.25rem;
  font-style: italic;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0;
  color: var(--text-muted);
}

.paper-abstract {
  margin-top: 1rem;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 40em;
}

.paper-foot {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  margin-top: 1.1rem;
  font-family: var(--font-sans);
  font-size: var(--step--1);
}

.paper-length { color: var(--text-light); }
.paper-link { color: var(--accent-color); font-weight: 500; }

/* --- 6. Archive ----------------------------------------------------------- */
.archive-year + .archive-year { margin-top: 3rem; }

.archive-year-title {
  font-family: var(--font-serif);
  font-size: var(--step-3);
  font-weight: 500;
  line-height: 1;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-dark);
  font-variant-numeric: lining-nums;
}

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

.archive-item {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--border-color);
}

.archive-date {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--text-light);
  padding-top: 0.2rem;
  white-space: nowrap;
}

.archive-main { display: flex; flex-direction: column; gap: 0.25rem; }

.archive-title {
  font-size: 1.25rem;
  line-height: 1.35;
  text-decoration: none;
  color: var(--text-color);
}
.archive-title:hover { color: var(--accent-color); text-decoration: underline; }

.archive-fields {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--accent-color);
}

.feed-note {
  margin-top: 3.5rem;
  padding: 1.4rem 1.5rem;
  background: var(--bg-secondary);
  border-top: 2px solid var(--accent-color);
}

.feed-note-title {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.feed-note p { color: var(--text-muted); }

.feed-note-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-top: 0.9rem;
}

.feed-url {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 0.35rem 0.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-color);
  word-break: break-all;
}

/* --- 7. Projects ---------------------------------------------------------- */
.project-group + .project-group { margin-top: 3.5rem; }

.project-kind {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-live {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 500;
  color: var(--accent-green);
}
.status-live::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.project-feature {
  padding: clamp(1.4rem, 4vw, 2.25rem);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-top: 3px solid var(--border-dark);
}

.project-feature + .project-feature { margin-top: 2rem; }

.project-name {
  margin-top: 0.4rem;
  font-family: var(--font-serif);
  font-size: var(--step-4);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 72;
}
.project-name a { text-decoration: none; color: var(--text-color); }
.project-name a:hover { color: var(--accent-color); }

.project-pitch {
  margin-top: 0.6rem;
  font-size: 1.25rem;
  font-style: italic;
  line-height: 1.45;
  color: var(--text-muted);
}

.project-desc {
  margin-top: 1.25rem;
  font-size: 1.0625rem;
  line-height: 1.7;
}

.project-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 13rem) minmax(0, 1fr);
  gap: 2rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.project-subhead {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.lang-list { list-style: none; }
.lang-list li {
  display: flex;
  flex-direction: column;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 1rem;
  line-height: 1.3;
}
.lang-list li:last-child { border-bottom: 0; }
.lang-list strong { font-weight: 500; }
.lang-list span { font-family: var(--font-sans); font-size: 0.8125rem; color: var(--text-light); }

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1.75rem;
}
.feature-list dt {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.feature-list dd {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.project-url {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-light);
}

.project-roadmap {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 2.5rem;
}

.roadmap-item { padding-top: 0.25rem; }

.roadmap-name {
  margin: 0.3rem 0 0.4rem;
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 500;
  line-height: 1.2;
}

.roadmap-desc { font-size: 1rem; line-height: 1.6; color: var(--text-muted); }

/* --- 8. Not found --------------------------------------------------------- */
.not-found { padding-top: 1rem; }
.not-found-code {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 0.75rem;
}
.not-found-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin-top: 2rem;
}

/* --- 9. Paper (post) header ----------------------------------------------- */
.post-header {
  margin-bottom: 2.5rem;
}

.post-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  margin-bottom: 1.1rem;
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--accent-color);
}

.post-title {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.post-title-main {
  display: block;
  font-size: var(--step-4);
  line-height: 1.06;
  font-variation-settings: "opsz" 72;
}

.post-title-sub {
  display: block;
  margin-top: 0.75rem;
  font-size: clamp(1.25rem, 1.1rem + 0.6vw, 1.55rem);
  font-style: italic;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--text-muted);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2.75rem;
  margin-top: 2rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-sans);
  font-size: var(--step--1);
}

.post-meta dt { color: var(--text-light); font-size: 0.75rem; }
.post-meta dd { color: var(--text-color); font-weight: 500; }
.post-meta-aff { display: block; font-weight: 400; color: var(--text-muted); }

/* --- 10. Prose (papers and pages) ----------------------------------------- */
.prose {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--text-color);
  hanging-punctuation: first;
}

.prose p { margin-bottom: 1.35em; }

.prose h2 {
  font-family: var(--font-serif);
  font-size: var(--step-3);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-variation-settings: "opsz" 60;
  margin: 2.75em 0 0.75em;
  text-wrap: balance;
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 500;
  line-height: 1.25;
  margin: 2.2em 0 0.6em;
}

.prose h4 {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  font-weight: 600;
  color: var(--text-color);
  margin: 2em 0 0.5em;
}

.prose ul, .prose ol { margin: 0 0 1.35em; padding-left: 1.4em; }
.prose li { margin-bottom: 0.45em; }
.prose li::marker { color: var(--text-light); }

.prose strong { font-weight: 600; }

.prose blockquote {
  margin: 2em 0;
  padding: 0.2em 0 0.2em 1.4em;
  border-left: 2px solid var(--accent-color);
  font-style: italic;
  font-size: 1.15em;
  line-height: 1.55;
  color: var(--text-color);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose blockquote cite {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-style: normal;
  color: var(--text-muted);
}

.prose img {
  display: block;
  margin: 2.25rem auto;
  border: 1px solid var(--border-color);
}

.prose table { width: 100%; border-collapse: collapse; font-size: 0.9em; margin: 2em 0; }
.prose th, .prose td { text-align: left; padding: 0.6em 0.75em; border-bottom: 1px solid var(--border-color); vertical-align: top; }
.prose th { font-family: var(--font-sans); font-size: 0.8em; font-weight: 600; border-bottom-color: var(--border-dark); }

hr {
  border: 0;
  height: 5px;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
  margin: 3rem 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.1em 0.35em;
  border-radius: var(--radius);
}

pre {
  margin: 0 0 1.5em;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  background: var(--code-bg);
  border-left: 2px solid var(--accent-color);
  border-radius: var(--radius);
  font-size: 0.85rem;
  line-height: 1.6;
}
pre code { background: none; color: var(--text-color); padding: 0; font-size: inherit; }

/* About page: section headings sit on a rule */
.page-content > h3:first-child { margin-top: 0; }
.page .prose h3 {
  padding-top: 0.9rem;
  border-top: 1px solid var(--border-color);
}

/* --- 11. Paper footer: citation, keywords, navigation, discussion ------- */
.post-footer {
  margin-top: 4rem;
  font-family: var(--font-sans);
}

.cite-box {
  padding: 1.35rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-top: 3px solid var(--border-dark);
}

.cite-box-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.cite-heading { font-size: var(--step-0); font-weight: 600; }

.cite-copy {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  color: var(--accent-color);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.cite-copy:hover { border-color: var(--accent-color); background: var(--accent-tint); }
.cite-copy.is-done { color: var(--accent-green); border-color: var(--accent-green); background: transparent; }

.cite-text {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.6;
  padding-left: 2em;
  text-indent: -2em;   /* APA hanging indent */
  word-break: break-word;
}
.cite-text cite { font-style: italic; }

.post-tags { margin-top: 2.25rem; }

.post-tags-heading,
.comments-heading {
  font-size: var(--step--1);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag {
  font-size: 0.8125rem;
  padding: 0.2rem 0.6rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border-radius: var(--radius);
}

.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-color);
}

.post-nav-cell a {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.25rem 0;
  text-decoration: none;
  color: var(--text-color);
}
.post-nav-next { text-align: right; }

.post-nav-label { font-size: 0.8125rem; color: var(--text-light); }

.post-nav-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.3;
}
.post-nav-cell a:hover .post-nav-title { color: var(--accent-color); text-decoration: underline; text-decoration-thickness: 1px; }

.comments-section { margin-top: 3.5rem; }

.giscus-placeholder {
  padding: 1.75rem 1.5rem;
  border: 1px dashed var(--border-color);
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}
.giscus-placeholder h3 { font-size: 1rem; color: var(--text-color); margin-bottom: 0.5rem; }
.giscus-placeholder p { margin-bottom: 1rem; }
.giscus-placeholder ol { padding-left: 1.25rem; }
.giscus-placeholder li { margin-bottom: 0.35rem; }

/* --- 12. Footer ----------------------------------------------------------- */
.site-footer {
  border-top: 3px double var(--border-dark);
  background: var(--bg-secondary);
  font-family: var(--font-sans);
  font-size: var(--step--1);
  color: var(--text-muted);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2rem 3rem;
  padding-top: 2.75rem;
  padding-bottom: 2.25rem;
}

.footer-wordmark {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-color);
  text-decoration: none;
}

.footer-desc { margin-top: 0.4rem; max-width: 30em; line-height: 1.55; }

.footer-nav {
  display: flex;
  gap: 3rem;
  justify-self: end;
}
.footer-nav ul { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.footer-nav a { color: var(--text-color); text-decoration: none; }
.footer-nav a:hover { color: var(--accent-color); text-decoration: underline; }

.footer-copy {
  grid-column: 1 / -1;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-light);
  font-size: 0.8125rem;
}

/* --- 13. Responsive ------------------------------------------------------- */
@media (max-width: 860px) {
  .paper { grid-template-columns: minmax(0, 1fr); gap: 0.6rem; }
  .paper-margin {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
    padding-top: 0;
  }
  .paper-date { display: inline; }
  .paper-fields { margin-top: 0; display: flex; gap: 1rem; flex-wrap: wrap; }

  .project-detail-grid { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    padding-top: 1.25rem;
    padding-bottom: 0.4rem;
  }
  .wordmark-name { font-size: 1.75rem; }
  .site-nav { width: 100%; }
  .nav-menu {
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 1.35rem;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .nav-menu::-webkit-scrollbar { display: none; }
  .nav-link { padding: 0.45rem 0 0.6rem; white-space: nowrap; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { justify-self: start; }

  .prose { font-size: 1.125rem; }
  .post-meta { gap: 0.75rem 1.75rem; }
}

@media (max-width: 560px) {
  .feature-list,
  .project-roadmap { grid-template-columns: minmax(0, 1fr); }

  .archive-item { grid-template-columns: minmax(0, 1fr); gap: 0.15rem; }

  .post-navigation { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .post-nav-next { text-align: left; border-top: 1px solid var(--border-color); }

  .cite-box { padding: 1.15rem 1.1rem; }
  .cite-box-head { flex-direction: column; align-items: flex-start; gap: 0.6rem; }
}

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

@media print {
  .site-header, .site-footer, .reading-progress-bar, .chapter-nav-wrapper,
  .comments-section, .post-navigation, .cite-copy, .skip-link { display: none !important; }
  body, html { background: #fff; }
  .prose { font-size: 11pt; }
}