/* ---------------------------------------------------
   Design tokens (from style-guide.html, Phase 2 approved)
--------------------------------------------------- */
:root {
  --bg: #FAF8F4;
  --bg-alt: #F1EDE6;
  --ink: #1C1B19;
  --ink-soft: #6B6560;
  --border: #E4DFD6;
  --accent: #2F4B3C;
  --accent-tint: #E3E9E4;

  --font-display: 'Newsreader', Georgia, serif;
  --font-body: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  --measure: 68ch;
}

/* Cross-document page transitions where supported; ignored elsewhere */
@view-transition {
  navigation: auto;
}

/* ---------------------------------------------------
   Reset
--------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1 0 auto; }
img { max-width: 100%; display: block; }
a { color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; margin: 0; }
p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------------------------------------------
   Accessibility
--------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--bg);
  padding: var(--space-3) var(--space-5);
  z-index: 100;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------------------------------------------------
   Layout shell
--------------------------------------------------- */
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* ---------------------------------------------------
   Header / nav
--------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.site-nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.nav-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  text-decoration: none;
  transition: color 150ms ease;
}
.nav-name:hover, .nav-name:focus-visible { color: var(--accent); }
.nav-links {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
  font-size: 0.875rem;
}
.nav-links a {
  position: relative;
  text-decoration: none;
  color: var(--ink-soft);
  padding-bottom: 3px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms ease;
}
.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="page"] {
  color: var(--ink);
}
.nav-links a:hover::after,
.nav-links a:focus-visible::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---------------------------------------------------
   Shared underline-link style
--------------------------------------------------- */
.link-underline {
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: color 150ms ease, text-decoration-color 150ms ease;
}
.link-underline:hover,
.link-underline:focus-visible {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ---------------------------------------------------
   Editorial row: narrow label column + wide content column
   Reused across About / Research / Projects / Achievements / Resume / Contact
--------------------------------------------------- */
.editorial-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-8) 0 var(--space-9);
}
.editorial-label {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.editorial-content {
  max-width: var(--measure);
}
.editorial-content > * + * { margin-top: var(--space-5); }

@media (min-width: 640px) {
  .editorial-row {
    grid-template-columns: 140px 1fr;
    gap: var(--space-6);
  }
}
@media (min-width: 1024px) {
  .editorial-row {
    grid-template-columns: 220px 1fr;
    gap: var(--space-8);
  }
}

/* ---------------------------------------------------
   Decorative background: drifting rule lines
   Used behind the hero and behind the About page
--------------------------------------------------- */
.hero-section {
  position: relative;
  overflow: hidden;
  min-height: 78vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-section .wrap {
  position: relative;
  z-index: 1;
}
.bg-lines {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    115deg,
    transparent 0px,
    transparent 78px,
    rgba(47, 75, 60, 0.12) 79px,
    rgba(47, 75, 60, 0.12) 80px
  );
  background-size: 480px 480px;
  animation: drift-lines 45s linear infinite;
}
@keyframes drift-lines {
  from { background-position: 0 0; }
  to { background-position: 480px 480px; }
}

/* Page-wide version of the same line pattern, painted on the body itself
   so it covers the full page regardless of content height (used on About) */
body.page-lines {
  background-image: repeating-linear-gradient(
    115deg,
    transparent 0px,
    transparent 78px,
    rgba(47, 75, 60, 0.12) 79px,
    rgba(47, 75, 60, 0.12) 80px
  );
  background-size: 480px 480px;
  animation: drift-lines 45s linear infinite;
}

/* ---------------------------------------------------
   Hero (home page only)
--------------------------------------------------- */
.hero {
  padding: var(--space-9) 0 var(--space-8);
  display: grid;
  gap: var(--space-6);
}
.hero h1 {
  font-size: clamp(2.5rem, 1.9rem + 3vw, 4rem);
  margin-bottom: var(--space-3);
}
.hero-status {
  color: var(--ink-soft);
  font-size: 1rem;
}
.hero-line {
  font-size: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  max-width: 52ch;
  line-height: 1.5;
}

@media (min-width: 1024px) {
  .hero {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }
  .hero-intro { grid-column: 1; }
  .hero-line { grid-column: 2; justify-self: end; text-align: left; }
}

@keyframes fade-up-in {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero h1 { animation: fade-up-in 600ms ease-out both; }
.hero-status { animation: fade-up-in 600ms ease-out 120ms both; }
.hero-line { animation: fade-up-in 600ms ease-out 240ms both; }

/* ---------------------------------------------------
   Research & Projects entries (narrative pages)
--------------------------------------------------- */
.entry + .entry {
  margin-top: var(--space-7);
  padding-top: var(--space-7);
  border-top: 1px solid var(--border);
}
.entry h2 {
  font-size: 1.375rem;
  margin-bottom: var(--space-1);
}
.entry-meta {
  color: var(--ink-soft);
  font-size: 0.875rem;
  margin-bottom: var(--space-4);
}
.entry p + p { margin-top: var(--space-4); }

/* ---------------------------------------------------
   Projects index grid
--------------------------------------------------- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 640px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}
.project-card {
  border-top: 1px solid var(--border);
  padding-top: var(--space-5);
  transition: transform 200ms ease, border-color 200ms ease;
}
.project-card:hover,
.project-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--accent);
}
.project-card h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
}
.project-card h2 a { text-decoration: none; transition: color 150ms ease; }
.project-card h2 a:hover, .project-card h2 a:focus-visible { color: var(--accent); }
.project-card > p { color: var(--ink-soft); margin-top: 0; margin-bottom: var(--space-4); }
.project-card-links {
  display: flex;
  gap: var(--space-5);
  font-size: 0.875rem;
}

/* ---------------------------------------------------
   Project detail pages
--------------------------------------------------- */
.back-link { font-size: 0.875rem; }
.repo-link { display: inline-block; font-size: 0.9375rem; }

/* ---------------------------------------------------
   Achievements
--------------------------------------------------- */
.achievement-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
@media (min-width: 640px) {
  .achievement-grid { grid-template-columns: repeat(3, 1fr); }
}
.achievement-card {
  background: var(--bg-alt);
  border-top: 3px solid var(--accent);
  padding: var(--space-5);
}
.achievement-card h2 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
}
.achievement-card p {
  color: var(--ink-soft);
  font-size: 0.9375rem;
}
.achievement-card--feature {
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  padding: var(--space-7) var(--space-5);
  border-top-width: 6px;
}
.achievement-card--feature h2 {
  font-size: 1.5rem;
  line-height: 1.25;
  margin-bottom: var(--space-3);
}
.achievement-card--feature p {
  font-size: 1.0625rem;
}

/* ---------------------------------------------------
   Resume
--------------------------------------------------- */
.editorial-content.is-wide { max-width: none; }
.resume-embed {
  width: 100%;
  max-width: 860px;
  height: 60vh;
  min-height: 520px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-alt);
}
@media (min-width: 640px) {
  .resume-embed { height: 75vh; min-height: 640px; }
}
@media (min-width: 1024px) {
  .resume-embed { height: 82vh; min-height: 720px; }
}
.resume-fallback { padding: var(--space-5); color: var(--ink-soft); }
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--bg);
  background: var(--accent);
  padding: var(--space-3) var(--space-6);
  border-radius: 3px;
  transition: transform 150ms ease, opacity 150ms ease;
}
.btn:hover, .btn:focus-visible { opacity: 0.88; transform: translateY(-2px); }

/* ---------------------------------------------------
   Contact
--------------------------------------------------- */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: 1.0625rem;
}
@media (min-width: 640px) {
  .contact-links { flex-direction: row; gap: var(--space-7); }
}


/* ---------------------------------------------------
   Footer
--------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
  color: var(--ink-soft);
  font-size: 0.875rem;
}

/* ---------------------------------------------------
   Scroll-reveal (JS-controlled)
--------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 550ms ease-out, transform 550ms ease-out;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-img {
  transform: translateY(20px) scale(0.97);
}
.reveal-img.is-visible {
  transform: translateY(0) scale(1);
}

/* ---------------------------------------------------
   Photos
--------------------------------------------------- */
.photo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-top: var(--space-5);
}
@media (min-width: 640px) {
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
}
.photo {
  margin: 0;
  border: 1px solid var(--border);
}
.photo img {
  width: 100%;
  height: auto;
  display: block;
}
.photo figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
}