/* ===== Custom Properties ===== */
:root {
  --color-bg: #eef9f0;
  --color-text: #2d2d2d;
  --color-text-muted: #6b6b6b;
  --color-link: #4a6fa5;
  --color-link-hover: #2c4a7c;
  --color-border: #e0e0e0;
  --color-section-bg: #fafafa;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2.5rem;
  --spacing-lg: 3.5rem;
  --spacing-xl: 5rem;
  --max-width: 820px;
}

/* ===== Base ===== */
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
}

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

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

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

p {
  margin-bottom: var(--spacing-sm);
}

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

/* ===== Layout ===== */
.site-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

/* ===== Header ===== */
.site-header {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.profile-photo {
  height: 280px;
  width: auto;
  flex-shrink: 0;
}

.header-info {
  flex: 1;
}

.header-info h1 {
  margin-bottom: var(--spacing-xs);
}

.header-info .subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.bio {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.75;
}

/* ===== Contact Links ===== */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs) var(--spacing-md);
  margin-top: var(--spacing-sm);
  font-size: 0.9rem;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

.contact-links .icon {
  width: 16px;
  height: 16px;
  vertical-align: middle;
}

/* ===== Sections ===== */
section {
  margin-bottom: var(--spacing-lg);
}

section h2 {
  margin-bottom: var(--spacing-md);
}

/* ===== Research ===== */
.research-description {
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ===== Publications ===== */
.publication-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.publication-list li {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.92rem;
  line-height: 1.7;
}

.publication-list li:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.pub-title {
  font-weight: 600;
}

.pub-title a {
  color: var(--color-link);
}

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

.pub-note {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.footer-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

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

.footer-links a:hover {
  color: var(--color-link-hover);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .site-wrapper {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .site-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .profile-photo {
    height: 220px;
    width: auto;
  }

  .contact-links {
    justify-content: center;
  }

  .site-footer {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-sm);
  }
}