:root {
  --color-bg: #faf7f2;
  --color-bg-alt: #f1ece3;
  --color-surface: #ffffff;
  --color-text: #24211d;
  --color-text-muted: #5b564c;
  --color-primary: #b1531f;
  --color-primary-dark: #8c3f14;
  --color-accent: #2c6e63;
  --color-border: #e3ddd1;
  --shadow-card: 0 8px 24px -12px rgba(36, 33, 29, 0.25);
  --radius: 14px;
  --font-serif: "Fraunces", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 100;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(250, 247, 242, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
}

.primary-nav {
  display: flex;
  gap: 28px;
}

.primary-nav a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}
.primary-nav a:hover { color: var(--color-primary); text-decoration: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
}

/* Hero */
.hero {
  padding: 72px 0 56px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: center;
}

.portrait-frame {
  position: relative;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(145deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-card);
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portrait-fallback {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 600;
  color: #fff;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  margin: 0 0 8px;
}

.hero-text h1 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  line-height: 1.15;
  margin: 0 0 12px;
}

.hero-affiliation {
  color: var(--color-text-muted);
  margin: 0 0 18px;
  font-size: 0.98rem;
}

.hero-summary {
  max-width: 560px;
  margin: 0 0 26px;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); }

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* Sections */
.section {
  padding: 64px 0;
}
.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  margin: 0 0 10px;
  position: relative;
  padding-left: 18px;
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.15em;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.section-lead {
  color: var(--color-text-muted);
  margin: 0 0 32px;
  max-width: 640px;
}

.about-content p {
  max-width: 720px;
  font-size: 1.02rem;
}

/* Research cards */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.theme-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.theme-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 28px -14px rgba(36, 33, 29, 0.32);
}

.theme-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.theme-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin: 0 0 8px;
}

.theme-card p {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 0.96rem;
}

/* Projects */
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.project-featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}
.project-featured::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.project-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.project-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-accent);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.project-featured .project-tag {
  background: var(--color-primary);
  color: #fff;
}

.project-dates {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.project-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin: 0 0 6px;
  line-height: 1.35;
}
.project-featured h3 {
  font-size: 1.35rem;
}

.project-funder {
  margin: 0 0 10px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.92rem;
}

.project-card > p:last-child {
  margin: 0;
  color: var(--color-text-muted);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 44px;
}

.project-tools-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin: 0 0 18px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--color-surface);
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
}

.tool-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.tool-title {
  margin: 0 0 6px;
  font-weight: 600;
  font-size: 1.02rem;
}

.tool-desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.tool-status {
  align-self: flex-start;
  padding: 4px 14px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Teaching */
.teaching-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  margin-bottom: 28px;
  align-items: start;
}

.teaching-philosophy p {
  margin: 0 0 16px;
  color: var(--color-text-muted);
}
.teaching-philosophy p:last-child { margin-bottom: 0; }

.teaching-courses h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin: 0 0 14px;
}

.course-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.course-code {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.92rem;
}

.course-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.course-role {
  grid-column: 2;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Publications */
.pub-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.pub-item {
  display: flex;
  gap: 20px;
  padding: 18px 22px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.pub-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-primary);
}

.pub-year {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-primary);
  min-width: 3.2em;
}

.pub-title {
  margin: 0 0 6px;
  font-weight: 600;
  font-size: 1rem;
}

.pub-meta {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.pub-meta em {
  font-style: italic;
  color: var(--color-accent);
}

.pub-doi {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  padding: 3px 10px;
  border: 1px solid var(--color-primary);
  border-radius: 999px;
}
.pub-doi:hover {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
}

.pub-full-link {
  display: inline-block;
}

/* News */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.news-list li {
  display: flex;
  gap: 18px;
  align-items: baseline;
}

.news-year {
  flex: 0 0 auto;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-serif);
}

/* Contact */
.contact-inner { text-align: left; }
.contact-details {
  margin: 0 0 24px;
  font-weight: 600;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.contact-details span {
  color: var(--color-text-muted);
}
.contact-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 0;
}
.footer-inner p {
  margin: 0 0 4px;
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

/* Responsive */
@media (max-width: 800px) {
  .theme-grid { grid-template-columns: 1fr; }
  .pub-item { flex-direction: column; gap: 6px; }
  .project-grid { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; }
  .teaching-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .portrait-frame { margin: 0 auto; }
  .hero-summary { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }

  .nav-toggle { display: flex; }
  .primary-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 12px 24px 20px;
    gap: 14px;
    display: none;
  }
  .primary-nav.open { display: flex; }
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #17150f;
    --color-bg-alt: #1d1a13;
    --color-surface: #221f18;
    --color-text: #f2eee4;
    --color-text-muted: #b8b0a0;
    --color-border: #343024;
    --color-primary: #e08a4d;
    --color-primary-dark: #f0a468;
    --color-accent: #56b3a3;
    --shadow-card: 0 8px 24px -12px rgba(0, 0, 0, 0.6);
  }
  .btn-primary { color: #1a1712; }
  .site-header { background: rgba(23, 21, 15, 0.85); }
}