:root {
  --bg: #ffffff;
  --bg-alt: #f4f6f8;
  --text: #1b2430;
  --text-muted: #5b6b7c;
  --border: #e2e7ec;
  --accent: #0f6e5e;
  --accent-strong: #0a4f43;
  --accent-soft: #e5f2ef;
  --card-bg: #ffffff;
  --shadow: 0 1px 3px rgba(16, 24, 32, 0.06), 0 8px 24px rgba(16, 24, 32, 0.05);
  --max-width: 1080px;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10161d;
    --bg-alt: #161e27;
    --text: #e8edf2;
    --text-muted: #9aabbb;
    --border: #263241;
    --accent: #3fbfa4;
    --accent-strong: #6fd8c1;
    --accent-soft: #17332d;
    --card-bg: #141c25;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

:root[data-theme="dark"] {
  --bg: #10161d;
  --bg-alt: #161e27;
  --text: #e8edf2;
  --text-muted: #9aabbb;
  --border: #263241;
  --accent: #3fbfa4;
  --accent-strong: #6fd8c1;
  --accent-soft: #17332d;
  --card-bg: #141c25;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f4f6f8;
  --text: #1b2430;
  --text-muted: #5b6b7c;
  --border: #e2e7ec;
  --accent: #0f6e5e;
  --accent-strong: #0a4f43;
  --accent-soft: #e5f2ef;
  --card-bg: #ffffff;
  --shadow: 0 1px 3px rgba(16, 24, 32, 0.06), 0 8px 24px rgba(16, 24, 32, 0.05);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
}

a {
  color: var(--accent-strong);
}

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

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

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

.brand {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.01em;
}

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

.primary-nav a {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.primary-nav a:hover {
  color: var(--accent-strong);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Hero */

.hero {
  padding: 72px 0 56px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--accent-strong);
  font-weight: 600;
  margin: 0 0 12px;
}

.hero-text h1 {
  font-size: clamp(2.2rem, 4vw, 3rem);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--text);
  margin: 0 0 16px;
  font-weight: 500;
}

.hero-sub {
  color: var(--text-muted);
  max-width: 56ch;
  margin: 0 0 28px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.hero-status {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.9rem;
  color: var(--accent-strong);
  background: var(--accent-soft);
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 600;
}

.hero-photo img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* Buttons */

.btn {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(15, 110, 94, 0.3);
}

.btn-outline {
  border-color: var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

/* Sections */

.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 1.7rem;
  margin: 0 0 28px;
  letter-spacing: -0.01em;
}

.sub-title {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 1.05rem;
  color: var(--accent-strong);
  margin: 32px 0 14px;
}

.sub-title:first-of-type {
  margin-top: 0;
}

.lead {
  font-size: 1.1rem;
}

.about-grid {
  max-width: 72ch;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.tag {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

/* Cards */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.card p {
  color: var(--text-muted);
  margin: 0 0 14px;
}

.card-links a {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

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

.small {
  font-size: 0.9rem;
}

.card-links .muted {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.85rem;
  font-style: italic;
}

.future-directions {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  padding-top: 28px;
}

.future-directions h3 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 1.05rem;
  margin: 0 0 14px;
}

.future-directions ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-muted);
}

.future-directions li {
  margin-bottom: 8px;
}

/* Publications */

.pub-list {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
}

.pub-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.pub-list li:last-child {
  border-bottom: none;
}

.pub-authors {
  font-weight: 700;
}

.pub-venue {
  color: var(--text-muted);
  font-style: italic;
}

.pub-list a {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  margin-left: 6px;
}

/* Teaching / Mentoring / Service grid */

.tms-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px 48px;
}

.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.plain-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.plain-list li:last-child {
  border-bottom: none;
}

.skills-block {
  margin-top: 44px;
  border-top: 1px solid var(--border);
  padding-top: 28px;
}

/* Timeline */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--border);
}

.timeline li {
  display: flex;
  gap: 24px;
  padding: 0 0 28px 24px;
  position: relative;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.timeline-year {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-weight: 700;
  color: var(--accent-strong);
  min-width: 90px;
  flex-shrink: 0;
}

.timeline-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.timeline-body span {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* CV section */

.cv-section {
  text-align: center;
}

.cv-inner p {
  color: var(--text-muted);
  max-width: 50ch;
  margin: 0 auto 24px;
}

/* Contact */

.contact-inner {
  text-align: center;
}

.contact-inner > p {
  color: var(--text-muted);
  max-width: 50ch;
  margin: 0 auto 24px;
}

.contact-list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 28px;
  padding: 0;
  margin: 0 0 20px;
  flex-wrap: wrap;
}

.contact-list a {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-weight: 600;
  text-decoration: none;
  font-size: 1.05rem;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

.site-footer p {
  color: var(--text-muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.85rem;
  text-align: center;
  margin: 0;
}

/* Responsive */

@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-photo {
    max-width: 260px;
    margin: 0 auto;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .tms-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 720px) {
  .primary-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 24px 20px;
    display: none;
    gap: 16px;
  }
  .primary-nav.open {
    display: flex;
  }
  .nav-toggle {
    display: flex;
  }
}