/* ============================================
   Academic Personal Site — Stylesheet
   ============================================ */

:root {
  --color-text: #333;
  --color-text-light: #555;
  --color-heading: #1a1a2e;
  --color-accent: #2c5282;
  --color-accent-hover: #1a365d;
  --color-bg: #fff;
  --color-bg-alt: #f7f7f9;
  --color-border: #e2e2e2;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 960px;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--color-accent-hover); text-decoration: underline; }

img { max-width: 100%; height: auto; }

/* ---- Header / Nav ---- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-heading);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.site-name:hover { color: var(--color-accent); text-decoration: none; }

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-text-light);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

.nav-toggle { display: none; background: none; border: none; font-size: 1.4rem; cursor: pointer; }

/* ---- Main Content ---- */
.site-content {
  min-height: calc(100vh - 160px);
}

.content-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

/* ---- Homepage / About layout ---- */
.about-wrapper {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.about-photo img {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.about-text h1 {
  font-size: 1.8rem;
  color: var(--color-heading);
  margin-bottom: 0.25rem;
  font-weight: 700;
}

.about-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-light);
  margin-bottom: 0.4rem;
}

.about-links {
  margin-bottom: 1.5rem;
}
.about-links a {
  font-size: 0.9rem;
  margin-right: 1rem;
}

.about-text p {
  margin-bottom: 1rem;
}

/* Education / Interests blocks */
.info-section { margin-top: 2rem; }
.info-section h3 {
  font-size: 1.05rem;
  color: var(--color-heading);
  margin-bottom: 0.6rem;
  font-weight: 600;
}
.info-section ul {
  list-style: none;
  padding: 0;
}
.info-section li {
  margin-bottom: 0.4rem;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ---- Inner pages (Research, Teaching, etc.) ---- */
.page-title {
  font-size: 1.6rem;
  color: var(--color-heading);
  margin-bottom: 1.5rem;
  font-weight: 700;
}

h2 {
  font-size: 1.25rem;
  color: var(--color-heading);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

h3 {
  font-size: 1.05rem;
  color: var(--color-heading);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

p { margin-bottom: 1rem; }

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
li { margin-bottom: 0.35rem; }

/* Publication entries */
.pub-entry {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}
.pub-entry:last-child { border-bottom: none; }

.pub-title {
  font-weight: 600;
  color: var(--color-heading);
}
.pub-authors {
  color: var(--color-text-light);
  font-size: 0.95rem;
}
.pub-venue {
  font-style: italic;
  color: var(--color-text-light);
  font-size: 0.95rem;
}
.pub-links {
  margin-top: 0.3rem;
  font-size: 0.9rem;
}
.pub-links a { margin-right: 0.75rem; }

/* ---- Contact page ---- */
.contact-info p {
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ---- Responsive ---- */
@media (max-width: 700px) {
  .about-wrapper {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .about-photo { max-width: 200px; margin: 0 auto; }
  .about-text { text-align: left; }

  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    gap: 0.75rem;
  }
  .site-nav.open { display: flex; }
}