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

/* === Theme Variables === */
:root {
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: var(--font-body);
  --max-width: 800px;
  --nav-height: 56px;

  /* Light theme (default) */
  --bg: #ffffff;
  --bg-secondary: #f5f6f8;
  --text: #1a1a1a;
  --text-secondary: #555;
  --accent: #2b5797;
  --accent-hover: #1e3d6f;
  --border: #e0e0e0;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --tag-bg: #e8eef6;
  --tag-text: #2b5797;
}

[data-theme="dark"] {
  --bg: #121212;
  --bg-secondary: #1e1e1e;
  --text: #e0e0e0;
  --text-secondary: #aaa;
  --accent: #6fa8dc;
  --accent-hover: #90c0f0;
  --border: #333;
  --card-bg: #1e1e1e;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --tag-bg: #1e2d40;
  --tag-text: #6fa8dc;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121212;
    --bg-secondary: #1e1e1e;
    --text: #e0e0e0;
    --text-secondary: #aaa;
    --accent: #6fa8dc;
    --accent-hover: #90c0f0;
    --border: #333;
    --card-bg: #1e1e1e;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --tag-bg: #1e2d40;
    --tag-text: #6fa8dc;
  }
}

/* === Base Styles === */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background 0.2s, color 0.2s;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}
h1 { font-size: 1.8rem; margin-bottom: 0.5rem; }
h2 { font-size: 1.4rem; margin-bottom: 0.75rem; border-bottom: 2px solid var(--accent); padding-bottom: 0.3rem; }
h3 { font-size: 1.1rem; margin-bottom: 0.4rem; }

p { margin-bottom: 1rem; }
img { max-width: 100%; height: auto; }

/* === Navigation === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
.nav-name:hover { color: var(--accent); text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* Publications dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.4rem 0;
  min-width: 140px;
  box-shadow: var(--card-shadow);
  z-index: 200;
}
.nav-dropdown:hover .nav-dropdown-content { display: block; }
.nav-dropdown-content a {
  display: block;
  padding: 0.4rem 1rem;
  border-bottom: none;
}
.nav-dropdown-content a:hover { background: var(--bg-secondary); }

/* Theme toggle */
.theme-toggle {
  width: 2.35rem;
  height: 2.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  padding: 0;
  font-size: 1rem;
  color: var(--text-secondary);
  transition: color 0.15s, border-color 0.15s, background 0.15s, transform 0.15s;
}
.theme-toggle i {
  font-size: 0.92rem;
  transition: transform 0.15s;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--card-bg);
}
.theme-toggle:hover i {
  transform: rotate(12deg);
}
.theme-toggle[data-mode="light"] {
  color: #b7791f;
}
.theme-toggle[data-mode="dark"] {
  color: var(--accent);
}

/* Mobile nav */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text);
}

@media (max-width: 640px) {
  .nav-hamburger { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.8rem;
  }
  .nav-links.open { display: flex; }
  .nav-dropdown-content {
    position: static;
    border: none;
    box-shadow: none;
    padding-left: 1rem;
  }
}

/* === Main Content === */
.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* === Home / About === */
.about-header {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--border);
}

.about-info h1 { margin-bottom: 0.15rem; }
.pronouns { font-size: 0.5em; font-weight: 400; color: var(--text-secondary); }
.about-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.keyword-tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}
.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  transition: color 0.15s, border-color 0.15s;
}
.social-link i { font-size: 1.1em; }
.social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.bio { line-height: 1.75; }
.bio p { margin-bottom: 1rem; }

@media (max-width: 640px) {
  .about-header { flex-direction: column; align-items: center; text-align: center; }
  .keywords { justify-content: center; }
}

/* === News === */
.news-list { list-style: none; }
.news-item {
  display: flex;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border);
}
.news-item:last-child { border-bottom: none; }
.news-date {
  flex-shrink: 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-width: 90px;
}
.news-text { font-size: 0.95rem; }

/* === Publications === */
.pub-card {
  padding: 1.2rem;
  margin-bottom: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.pub-card-selected {
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
}
.pub-thumbnail {
  width: 250px;
  height: auto;
  border-radius: 4px;
  flex-shrink: 0;
  object-fit: cover;
}
.pub-body { flex: 1; min-width: 0; }
.content:has(.pub-card-selected) { max-width: calc(var(--max-width) * 1.5); }
@media (max-width: 640px) {
  .pub-card-selected { flex-direction: column; }
  .pub-thumbnail { width: 100%; }
}
.pub-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.3rem; }
.pub-title a { color: var(--text); }
.pub-title a:hover { color: var(--accent); }
.pub-authors { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.25rem; }
.pub-venue { font-size: 0.85rem; font-style: italic; color: var(--text-secondary); margin-bottom: 0.4rem; }
.pub-description { font-size: 0.9rem; margin-top: 0.5rem; line-height: 1.6; }
.pub-links { display: flex; gap: 0.6rem; margin-top: 0.5rem; }
.pub-link {
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--accent);
  border-radius: 3px;
  color: var(--accent);
}
.pub-link:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}
.pub-citations { font-size: 0.8rem; color: var(--text-secondary); }

/* All publications year groups */
.pub-year-group { margin-bottom: 1.5rem; }
.pub-year-heading {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--accent);
  border-bottom: none;
  padding-bottom: 0;
}

/* Expandable abstract */
.pub-abstract { margin-top: 0.5rem; font-size: 0.88rem; line-height: 1.6; color: var(--text-secondary); }
.pub-abstract-toggle {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.82rem;
  padding: 0;
  margin-top: 0.3rem;
}
.pub-abstract-toggle:hover { text-decoration: underline; }
.pub-abstract-text { display: none; margin-top: 0.4rem; }
.pub-abstract-text.open { display: block; }

/* === CV Page === */
.cv-downloads { display: flex; gap: 1rem; margin-bottom: 2rem; }
.cv-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: #fff;
  border-radius: 5px;
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.15s;
}
.cv-download-btn:hover { background: var(--accent-hover); color: #fff; text-decoration: none; }

.cv-section { margin-bottom: 1.5rem; }
.cv-entry { margin-bottom: 1rem; }
.cv-entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.cv-entry-title { font-weight: 600; }
.cv-entry-dates { font-size: 0.85rem; color: var(--text-secondary); }
.cv-entry-org { font-size: 0.9rem; color: var(--text-secondary); font-style: italic; }
.cv-entry-items {
  list-style: disc;
  padding-left: 1.2rem;
  margin-top: 0.3rem;
}
.cv-entry-items li { font-size: 0.9rem; margin-bottom: 0.2rem; }

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}
.footer-links a { color: var(--text-secondary); transition: color 0.15s; }
.footer-links a:hover { color: var(--accent); }