/* ---- globals ---- */
:root {
  color-scheme: light dark;

  --bg: oklch(0.99 0.003 80);
  --ink: oklch(0.22 0.005 90);
  --ink-soft: oklch(0.3 0.005 90);
  --muted: oklch(0.4 0.01 90);
  --muted-2: oklch(0.48 0.01 90);
  --muted-3: oklch(0.5 0.01 90);
  --rule: oklch(0.88 0.005 90);
  --link: oklch(0.4 0.09 250);
  --link-underline: oklch(0.4 0.09 250 / 0.4);
  --link-hover: oklch(0.32 0.1 250);

  /* surfaces / accents promoted from hardcoded literals */
  --avatar-1: oklch(0.9 0.01 90);
  --avatar-2: oklch(0.86 0.01 90);
  --card-hover-border: oklch(0.78 0.005 90);
  --cta-hover: oklch(0.32 0.005 90);

  --tag-green-bg: oklch(0.9 0.05 145);
  --tag-green-ink: oklch(0.3 0.06 145);
  --tag-blue-bg: oklch(0.9 0.03 250);
  --tag-blue-ink: oklch(0.35 0.07 250);
  --tag-gray-bg: oklch(0.92 0.01 90);
  --tag-gray-ink: oklch(0.42 0.01 90);

  --serif: 'Newsreader', serif;
  --sans: 'Inter', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: oklch(0.17 0.005 80);
    --ink: oklch(0.93 0.004 90);
    --ink-soft: oklch(0.85 0.005 90);
    --muted: oklch(0.72 0.01 90);
    --muted-2: oklch(0.66 0.01 90);
    --muted-3: oklch(0.6 0.01 90);
    --rule: oklch(0.32 0.005 90);
    --link: oklch(0.74 0.11 250);
    --link-underline: oklch(0.74 0.11 250 / 0.4);
    --link-hover: oklch(0.82 0.11 250);

    --avatar-1: oklch(0.32 0.01 90);
    --avatar-2: oklch(0.27 0.01 90);
    --card-hover-border: oklch(0.44 0.005 90);
    --cta-hover: oklch(0.85 0.005 90);

    --tag-green-bg: oklch(0.32 0.05 145);
    --tag-green-ink: oklch(0.86 0.08 145);
    --tag-blue-bg: oklch(0.32 0.05 250);
    --tag-blue-ink: oklch(0.85 0.08 250);
    --tag-gray-bg: oklch(0.3 0.01 90);
    --tag-gray-ink: oklch(0.78 0.01 90);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* Stop mobile Safari/Chrome from auto-inflating long text blocks */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.5;
}

a { text-decoration: none; color: inherit; }

.page {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

/* ---- inline links (GitHub / Email / Preprint …) ---- */
.link {
  color: var(--link);
  border-bottom: 1px solid var(--link-underline);
}
.link:hover { color: var(--link-hover); }

/* ---- nav ---- */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 40px;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
}
.nav-logo img {
  height: 32px;
  width: auto;
  display: block;
}
@media (prefers-color-scheme: dark) {
  /* logo.svg is a light tile with dark strokes; invert so it reads on dark */
  .nav-logo img { filter: invert(0.92) hue-rotate(180deg); }
}
.nav-links {
  display: flex;
  gap: 32px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
}
.navlink { color: inherit; }
.navlink:hover { color: var(--ink); }

/* ---- hero / bio ---- */
.hero {
  display: flex;
  gap: 56px;
  padding: 72px 40px 64px;
  align-items: flex-start;
  scroll-margin-top: 90px;
}
.avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  flex-shrink: 0;
  object-fit: cover;
  background: repeating-linear-gradient(135deg,
    var(--avatar-1), var(--avatar-1) 8px,
    var(--avatar-2) 8px, var(--avatar-2) 16px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: monospace;
  font-size: 11px;
  color: var(--muted-3);
  text-align: center;
}
.hero-body { max-width: 640px; }
.hero h1 {
  font-size: 40px;
  font-weight: 600;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.hero-affiliation {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--muted-3);
  margin: 0 0 24px;
}
.hero-bio {
  font-size: 18px;
  margin: 0 0 24px;
  color: var(--ink-soft);
}
.hero-links {
  display: flex;
  gap: 20px;
  font-family: var(--sans);
  font-size: 14px;
}

/* ---- generic section ---- */
.section {
  padding: 8px 40px 56px;
  scroll-margin-top: 90px;
}
.section-title {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 20px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 12px;
}

/* ---- research ---- */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  font-family: var(--sans);
}
.research-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.research-thumb {
  width: 56px;
  height: 56px;
  border-radius: 6px;
  flex-shrink: 0;
  object-fit: contain;
  margin-top: 2px;
}
.research-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
}
.research-desc {
  font-size: 14px;
  color: var(--muted-2);
  margin: 4px 0 0;
}
.research-meta {
  font-size: 13px;
  color: var(--muted-3);
  margin-top: 8px;
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}
.tag {
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 12px;
}
.tag-green { background: var(--tag-green-bg); color: var(--tag-green-ink); }
.tag-blue  { background: var(--tag-blue-bg); color: var(--tag-blue-ink); }
.tag-gray  { background: var(--tag-gray-bg); color: var(--tag-gray-ink); }

/* ---- blog ---- */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  font-family: var(--sans);
}
.post-card {
  display: block;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 20px;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.post-card:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-2px);
}
.post-date {
  font-size: 12px;
  color: var(--muted-3);
  margin-bottom: 8px;
}
.post-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  font-family: var(--serif);
}
.post-excerpt {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

/* ---- cv ---- */
.cv-row {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 16px;
}
.cta {
  color: var(--bg);
  background: var(--ink);
  padding: 8px 16px;
  border-radius: 4px;
  font-weight: 500;
  white-space: nowrap;
}
.cta:hover { background: var(--cta-hover); }

/* section id="cv" carries .section padding via the shared class */
#cv { padding-bottom: 72px; }

/* ---- footer ---- */
.footer {
  padding: 24px 40px;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 12px;
  color: var(--muted-3);
}

/* ---- blog post page ---- */
.post {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 40px 64px;
  font-family: var(--sans);
}
.post-back {
  font-size: 14px;
  margin: 0 0 32px;
}
.draft-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 12px;
  background: var(--tag-gray-bg);
  color: var(--tag-gray-ink);
  margin: 0 0 16px;
}
.post-heading {
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
.post-byline {
  font-size: 13px;
  color: var(--muted-3);
  margin: 0 0 32px;
}
.post-body {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-soft);
}
.post-body p { margin: 0 0 20px; }
.post-body ul { margin: 0 0 20px; padding-left: 24px; }
.post-body li { margin: 0 0 8px; }

/* ============================================================================
   Responsive (added — the mock-up was desktop-only at a fixed 1100px)
   ============================================================================ */

/* tablet / small laptop */
@media (max-width: 720px) {
  .nav {
    padding: 20px 24px;
    gap: 16px;
  }
  .nav-links { gap: 20px; }

  .hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 28px;
    padding: 48px 24px 48px;
  }
  .hero-body { max-width: 100%; }
  .hero h1 { font-size: 34px; }
  .hero-links { justify-content: center; flex-wrap: wrap; }

  .section { padding: 8px 24px 48px; }
  #cv { padding-bottom: 56px; }

  .post { padding: 40px 24px 56px; }

  .blog-grid { grid-template-columns: 1fr; }

  .cv-row { flex-direction: column; align-items: flex-start; }

  .footer { padding: 24px; }
}

/* phone */
@media (max-width: 480px) {
  .nav {
    padding: 18px 20px;
    gap: 12px;
  }
  .nav-links { gap: 16px; }
  .hero h1 { font-size: 30px; }
  .hero-bio { font-size: 16px; }
  .research-item { gap: 14px; }
}