/* ==========================================================================
   Essa Jan — site styles
   Single stylesheet shared by every page.
   ========================================================================== */

:root {
  --bg: #f7f1e6;
  --surface: #fbf7f0;
  --text: #2a2622;
  --text-secondary: #6f665c;
  --accent: #3f5d45;
  --accent-hover: #2f4634;
  --border: #e2d9c9;
  --hover: #f1e9db;

  --measure: 800px;
  --font-sans:
    ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-serif:
    "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
    "Times New Roman", serif;
  --font-mono:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  /* Single base size for every screen — no wide-screen step-ups, so what you
     see locally is exactly what ships. 14.4px is 90% of the browser's 16px
     default, which bakes in the 90%-zoom look at 100% zoom. Every other size
     is in rem, so this one value rescales the whole design; --measure below
     controls the column width independently. */
  font-size: 14.4px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
}

/* Justified body copy across every page. Hyphenation is what keeps the
   ragged gaps ("rivers") out of a justified column, especially on mobile. */
.bio,
.bio-research,
.news-content,
.item-description,
.post-list-excerpt,
.prose p,
.prose li,
.prose blockquote {
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}

/* Reference entries and code stay ragged-right — justifying a citation or a
   code line stretches it into nonsense. */
.prose .references-item,
.prose pre,
.prose pre code {
  text-align: left;
  hyphens: none;
  -webkit-hyphens: none;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.container {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

/* --------------------------------------------------------------------------
   Site navigation (every page)
   -------------------------------------------------------------------------- */

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-bottom: 1.25rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.site-nav .brand {
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-right: auto;
}

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

.site-nav a {
  color: var(--text-secondary);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition:
    color 0.15s ease,
    border-color 0.15s ease;
}

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

.site-nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   Home — header
   -------------------------------------------------------------------------- */

.header-wrapper {
  margin-bottom: 3rem;
}

.header-top {
  display: flex;
  align-items: flex-start;
  gap: 2.25rem;
  margin-bottom: 1rem;
}

.profile-image {
  width: 13.44rem;
  height: 13.44rem;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(42, 38, 34, 0.06);
}

.header-content {
  flex: 1;
  min-width: 0;
}

.name {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin-bottom: 0.35rem;
}

.title {
  font-size: 1.08rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.bio,
.bio-research {
  font-size: 1.08rem;
  line-height: 1.75;
  margin-bottom: 1rem;
}

.bio {
  margin-bottom: 0;
}

.bio-research {
  margin-bottom: 1.5rem;
}

.bio-research:last-child {
  margin-bottom: 0;
}

.social-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.social-links a {
  color: var(--text-secondary);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--border);
  transition:
    color 0.15s ease,
    border-color 0.15s ease;
}

.social-links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section {
  margin-bottom: 3rem;
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

/* News */

.news-item {
  display: flex;
  gap: 1.5rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}

.news-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.news-date {
  color: var(--text-secondary);
  font-size: 0.92rem;
  min-width: 8.75rem;
  flex-shrink: 0;
  padding-top: 0.15rem;
  font-variant-numeric: tabular-nums;
}

.news-content {
  flex: 1;
  font-size: 1.08rem;
}

/* Research list */

.item-list {
  display: flex;
  flex-direction: column;
}

.item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

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

.item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.item-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.35rem;
}

.item-title a {
  color: var(--text);
}

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

.contributors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0.2rem;
}

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

.item-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.item-description {
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Abstracts stay collapsed until the item is hovered (or focused via the
   keyboard). Wrapped in (hover: hover) so touch devices — which have no hover
   state to reveal it with — always show the text. */
@media (hover: hover) {
  .item-description {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition:
      max-height 0.3s ease,
      opacity 0.2s ease;
  }

  .item:hover .item-description,
  .item:focus-within .item-description {
    max-height: 30rem;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .item-description {
    transition: none;
  }
}

/* Plain bulleted list at body size — no rules between items, no bold. */
.plain-list {
  padding-left: 1.35rem;
  font-size: 1.08rem;
  line-height: 1.75;
}

.plain-list li + li {
  margin-top: 0.35rem;
}

/* --------------------------------------------------------------------------
   Page header (blog, reads, post)
   -------------------------------------------------------------------------- */

.page-header {
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2.35rem;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin-bottom: 0.4rem;
}

.page-header .tagline {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Post / read listings
   -------------------------------------------------------------------------- */

.post-list {
  display: flex;
  flex-direction: column;
}

.post-list-item {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border);
}

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

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

.post-list-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.3rem;
}

.post-list-title a {
  color: var(--text);
}

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

.post-list-meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.55rem;
}

.post-list-excerpt {
  font-size: 0.97rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.read-more {
  font-size: 0.88rem;
  font-weight: 500;
}

.empty-state,
.error-state {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding: 0.5rem 0;
}

.error-state code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--hover);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

/* --------------------------------------------------------------------------
   Single post — long-form prose
   -------------------------------------------------------------------------- */

.post-header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.6rem;
}

.post-header .post-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.prose {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.8;
}

.prose > * + * {
  margin-top: 1.25rem;
}

.prose h2 {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.3;
  margin-top: 2.5rem;
  letter-spacing: -0.01em;
}

.prose h3 {
  font-size: 1.38rem;
  font-weight: 600;
  margin-top: 2rem;
}

.prose ul,
.prose ol {
  padding-left: 1.4rem;
}

.prose li + li {
  margin-top: 0.4rem;
}

.prose blockquote {
  border-left: 2px solid var(--accent);
  padding-left: 1.1rem;
  color: var(--text-secondary);
  font-style: italic;
}

.prose img {
  display: block;
  border-radius: 3px;
  border: 1px solid var(--border);
}

/* Reference entries read as one block, so they sit tighter than body
   paragraphs. Tagged in site.js by the heading they follow. */
.prose .references-item {
  margin-top: 0.35rem;
}

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

.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--hover);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.prose pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  line-height: 1.55;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.92rem;
}

.prose th,
.prose td {
  border-bottom: 1px solid var(--border);
  padding: 0.55rem 0.75rem;
  text-align: left;
}

.prose th {
  font-weight: 600;
  border-bottom-color: var(--text-secondary);
}

.table-scroll {
  overflow-x: auto;
}

.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Mobile
   -------------------------------------------------------------------------- */

@media (max-width: 720px) {
  .container {
    padding: 2rem 1.1rem 3rem;
  }

  .site-nav {
    gap: 0.9rem;
    flex-wrap: wrap;
    font-size: 0.85rem;
  }

  /* Brand keeps its row with the links; wrapping is the fallback, not the
     default, so the three page links only drop when they genuinely can't fit. */
  .site-nav .brand {
    font-size: 0.9rem;
    white-space: nowrap;
  }

  .site-nav a {
    white-space: nowrap;
  }

  .header-top {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }

  .profile-image {
    width: 10.63rem;
    height: 10.63rem;
  }

  .name {
    font-size: 2rem;
  }

  .social-links {
    justify-content: center;
  }

  .news-item {
    flex-direction: column;
    gap: 0.25rem;
  }

  .news-date {
    min-width: auto;
  }

  .page-header h1,
  .post-header h1 {
    font-size: 1.95rem;
  }
}

@media print {
  .site-nav,
  .post-footer {
    display: none;
  }

  body {
    background: #fff;
  }
}