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

:root {
  --color-text: hsl(211, 25%, 10%);
  --color-link: hsl(211, 75%, 40%);
  --color-link-hover: hsl(211, 75%, 40%);
  --color-muted: hsl(211, 10%, 40%);
  --color-background: #FAFAFA;
  --color-border: hsl(211, 10%, 88%);
  --color-thumbnail-bg: #f3f4f6;
  --color-pill-bg: #fafafa;
  --color-pill-hover-bg: #ffffff;
  --max-width: 800px;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

[data-theme="dark"] {
  --color-text: hsl(211, 15%, 85%);
  --color-link: hsl(211, 70%, 65%);
  --color-link-hover: hsl(211, 70%, 75%);
  --color-muted: hsl(211, 10%, 60%);
  --color-background: hsl(211, 20%, 12%);
  --color-border: hsl(211, 15%, 25%);
  --color-thumbnail-bg: hsl(211, 15%, 18%);
  --color-pill-bg: hsl(211, 15%, 18%);
  --color-pill-hover-bg: hsl(211, 15%, 22%);
}

body {
  font-family: var(--font-main);
  line-height: 1.375;
  color: var(--color-text);
  background: var(--color-background);
  transition: background 0.3s ease, color 0.3s ease;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-text);
  padding-bottom: 0.25rem;
  display: inline-block;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 1rem;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.25s ease-out;
}

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

p {
  margin-bottom: 0.5rem;
}

ul {
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.35rem;
}

strong {
  font-weight: 600;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
}

/* ===== Hero / Header ===== */
.hero {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.hero-info {
  flex: 0 1 auto;
}

.hero h1 {
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

.nav-sections {
  display: flex;
  gap: 1.5rem;
  font-size: 1rem;
  flex-shrink: 0;
}

.nav-sections a {
  color: var(--color-text);
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.25s ease-out;
}

.nav-sections a:hover {
  color: var(--color-link);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--color-text);
  padding: 0;
  line-height: 1;
  transition: color 0.25s ease-out;
}

.theme-toggle:hover {
  color: var(--color-link);
}

/* ===== Intro Section ===== */
.intro-header {
  margin-bottom: 1.5rem;
  padding: 1.5rem 0;
}

.intro-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 3rem;
}

.intro-text {
  flex: 1;
  max-width: 65%;
}

.greeting {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  border-bottom: none;
  display: block;
}

.intro-bio {
  font-size: 1.05rem;
  line-height: 1.45;
  margin-bottom: 0.75rem;
}

.intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  list-style: none;
  padding: 0;
}

.intro-links li {
  display: flex;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-pill-bg);
  transition: all 0.25s ease-out;
  margin-bottom: 0;
}

.intro-links li:hover {
  background-color: var(--color-pill-hover-bg);
  border-color: var(--color-link);
}

.intro-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5em 0.875em;
  color: var(--color-text);
  text-decoration: none;
  width: 100%;
}

.intro-links a:hover {
  color: var(--color-text);
}

.intro-links i {
  font-size: 1em;
  color: var(--color-text);
}

/* Placeholder pill: keeps the slot visible but inert. */
.intro-links li.disabled {
  opacity: 0.4;
}

.intro-links li.disabled:hover {
  background-color: var(--color-pill-bg);
  border-color: var(--color-border);
}

.intro-links li.disabled a {
  cursor: not-allowed;
}

.intro-image {
  flex-shrink: 0;
  align-self: center;
}

.intro-image img {
  width: 240px;
  /* main.jpg is already square, so height follows the width and nothing is
     cropped. If you swap in a photo of another ratio, object-position picks
     the visible window: 0% is the top of the photo, 100% the bottom. */
  aspect-ratio: 1 / 1;
  border-radius: 8px;
  object-fit: cover;
  object-position: center;
}

/* ===== Section shared ===== */
.section-block {
  margin-bottom: 1.25rem;
}

.section-note {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
}

/* ===== News ===== */
.news-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
}

.news-table tr {
  border-bottom: 1px solid var(--color-border);
}

.news-table tr:last-child {
  border-bottom: none;
}

.news-table td {
  padding: 0.6rem 0;
  vertical-align: top;
  font-size: 0.95rem;
}

.news-date {
  width: 140px;
  color: var(--color-muted);
  white-space: nowrap;
  font-size: 0.9rem;
}

.news-desc {
  padding-left: 2rem;
}

/* ===== Publications ===== */
.publications-list {
  margin-top: 0.5rem;
}

.publication {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.publication:last-child {
  border-bottom: none;
}

.pub-content {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.pub-thumbnail {
  flex-shrink: 0;
  width: 180px;
  border-radius: 4px;
  overflow: hidden;
  background-color: var(--color-thumbnail-bg);
}

.pub-thumbnail img,
.pub-thumbnail video {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.pub-info {
  flex: 1;
  min-width: 0;
}

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 0.35rem;
}

.pub-authors {
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
  color: var(--color-muted);
}

.pub-venue {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.award {
  color: #d97706;
}

.pub-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
}

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

/* ===== Education & Experience ===== */
.entry {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.entry:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.entry-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.entry-date {
  font-size: 0.875rem;
  color: var(--color-muted);
  white-space: nowrap;
}

.entry-detail {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 0.15rem;
}

/* ===== Footer ===== */
footer {
  margin-top: 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.footer-col {
  flex: 1;
  text-align: center;
}

.footer-col:first-child {
  text-align: left;
}

.footer-col:last-child {
  text-align: right;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .container {
    padding: 0.5rem 1rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .hero-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .hero-info {
    text-align: center;
    width: 100%;
  }

  .nav-sections {
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
  }

  .intro-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }

  .intro-text {
    max-width: 100%;
  }

  /* Width only: height comes from the aspect-ratio above. */
  .intro-image img {
    width: 150px;
  }

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

  .pub-content {
    flex-direction: column;
  }

  .pub-thumbnail {
    width: 100%;
  }

  .publication {
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
  }

  .entry-header {
    flex-direction: column;
    gap: 0;
  }
}