/* === Variables === */
:root {
  --color-bg: #ffffff;
  --color-text: #333333;
  --color-heading: #1a1a1a;
  --color-link: #2056a8;
  --color-link-hover: #1a3f7a;
  --color-muted: #555555;
  --color-border: #ddd;
  --color-code-bg: #f5f5f5;
  --font-body: Georgia, "Times New Roman", serif;
  --font-heading: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --max-width: 800px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-heading);
  line-height: 1.3;
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Header === */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 32px 0 24px;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.site-header nav {
  display: flex;
  gap: 24px;
}

.site-header nav a {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--color-muted);
}

.site-header nav a:hover {
  color: var(--color-link);
  text-decoration: none;
}

/* === Sections === */
.section {
  padding: 40px 0;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

.section h2 {
  font-size: 1.4rem;
  margin: 0 0 20px;
}

/* === About === */
#about p {
  margin: 0 0 16px;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  line-height: 2;
}

/* === Publications === */
.pub-year {
  font-size: 1.2rem;
  margin: 32px 0 12px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

.pub-year:first-child {
  margin-top: 0;
}

.pub-entry {
  margin-bottom: 28px;
  padding-left: 16px;
}

.pub-title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: bold;
  margin: 0 0 4px;
  line-height: 1.5;
}

.pub-authors {
  margin: 0 0 2px;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.pub-venue {
  margin: 0 0 6px;
  font-size: 0.93rem;
}

.pub-links {
  margin: 6px 0 0;
  font-family: var(--font-heading);
  font-size: 0.88rem;
}

.pub-links a {
  white-space: nowrap;
}

.pub-bibtex {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 12px 16px;
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.pub-abstract {
  border-left: 3px solid var(--color-border);
  padding: 8px 0 8px 16px;
  margin: 10px 0 0;
  font-size: 0.93rem;
  color: var(--color-muted);
}

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
  margin-top: 20px;
}

.site-footer p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
  font-family: var(--font-heading);
}

/* === Responsive === */
@media (max-width: 600px) {
  body {
    font-size: 16px;
  }

  .container {
    padding: 0 16px;
  }

  .site-header {
    padding: 24px 0 16px;
  }

  .site-header h1 {
    font-size: 1.6rem;
  }

  .section {
    padding: 28px 0;
  }

  .pub-entry {
    padding-left: 8px;
  }
}

/* === Print === */
@media print {
  .site-header nav,
  .pub-links,
  .site-footer {
    display: none;
  }

  .pub-year {
    position: static;
  }

  body {
    font-size: 12pt;
  }
}