/* ── Reset & Base ── */

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

:root {
  --color-text: #2c2c2c;
  --color-text-secondary: #555;
  --color-accent: #3d6b8e;
  --color-accent-hover: #2a4f6b;
  --color-border: #ddd;
  --color-bg: #fafafa;
  --color-bg-alt: #f0f0f0;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text);
  font-family: var(--font-body);
  background: var(--color-bg);
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Container ── */

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* ── Header ── */

.site-header {
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
}

/* ── Main ── */

main.container {
  flex: 1;
  padding-top: 3rem;
  padding-bottom: 4rem;
}

/* ── Typography ── */

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

h3 {
  font-size: 1.1rem;
  font-weight: 400;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
}

p {
  margin-bottom: 1.2rem;
}

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

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

ul, ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

strong {
  font-weight: 600;
}

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

/* ── Footer ── */

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.site-footer p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ── Landing Page ── */

.landing {
  text-align: center;
  padding-top: 2rem;
}

.landing .headshot {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1.8rem;
  border: 3px solid var(--color-bg-alt);
}

.landing h1 {
  font-size: 2rem;
  margin-bottom: 0.3rem;
}

.landing .tagline {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  font-weight: 400;
}

.landing .bio {
  max-width: 520px;
  margin: 0 auto 1.5rem;
  font-size: 0.98rem;
  line-height: 1.5;
}

.landing .affiliations {
  max-width: 520px;
  margin: 0 auto 2rem;
  font-size: 0.93rem;
  line-height: 1.75;
}

.landing .affiliations p {
  margin-bottom: 0.25rem;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--color-accent);
  font-weight: 500;
}

/* ── Research Page: PER section de-emphasis ── */

.section-secondary h2 {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.section-secondary {
  color: var(--color-text-secondary);
}

.section-secondary a {
  color: var(--color-accent);
}

/* ── Publications list ── */

.publications-list {
  list-style: none;
  padding-left: 0;
}

.publications-list li {
  margin-bottom: 1rem;
  padding-left: 0;
  font-size: 0.93rem;
  line-height: 1.65;
}

/* ── Skills list ── */

.skills-list {
  list-style: none;
  padding-left: 0;
}

.skills-list li {
  margin-bottom: 0.5rem;
}

/* ── Responsive ── */

@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    gap: 1rem;
  }

  .landing .headshot {
    width: 130px;
    height: 130px;
  }

  .landing h1 {
    font-size: 1.6rem;
  }
}