:root {
  --bg: #f9fafb; /* washed off-white, slightly cool (Tailwind gray-50, matches sample) */
  --text: #1f2937; /* slate gray-800 */
  --muted: #6b7280; /* gray-500 */
  --accent: #8a1538; /* MIT-ish cardinal */
  --border: #e5e7eb; /* gray-200 */
}

/* Dark values reused by both the system default and an explicit toggle. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161410; /* matches black.png */
    --text: #f3f4f6; /* gray-100 */
    --muted: #9ca3af; /* gray-400 */
    --accent: #e2879c;
    --border: #1f2937; /* gray-800 */
  }
}

:root[data-theme="dark"] {
  --bg: #161410; /* matches black.png */
  --text: #f3f4f6;
  --muted: #9ca3af;
  --accent: #e2879c;
  --border: #1f2937;
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding: 4rem 1.5rem;
}

.container {
  max-width: 760px;
  margin: 0 auto;
}

/* ---- Theme toggle ---- */
.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  line-height: 1;
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--muted);
  border-radius: 50%;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  z-index: 10;
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* Show the moon in light mode, the sun in dark mode. */
.theme-toggle .icon-sun {
  display: none;
}
.theme-toggle .icon-moon {
  display: inline;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: inline;
  }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: inline;
}
:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

a:hover {
  border-bottom-color: var(--accent);
}

/* ---- Intro: two columns ---- */
.intro {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 3.5rem;
}

.intro-text h1 {
  font-family: "Newsreader", Georgia, serif;
  font-size: 2.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  color: var(--text);
}

.intro-text h1 .alias {
  color: var(--muted);
  font-weight: 400;
}

.intro-text p {
  margin-bottom: 0.9rem;
  color: var(--text);
}

.intro-text p:last-child {
  margin-bottom: 0;
}

.intro-photo img {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: 16px;
  display: block;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

/* ---- Publications ---- */
.publications {
  margin-bottom: 3rem;
}

.publications h2 {
  font-family: "Newsreader", Georgia, serif;
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.publications h2::after {
  content: "";
  display: block;
  width: 100%;
  height: 1px;
  background: var(--border);
  margin-top: 0.75rem;
}

.pub-list {
  list-style: none;
  counter-reset: pub;
}

.pub-list li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}

.pub-list li:last-child {
  border-bottom: none;
}

.pub-title {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.pub-authors {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0.1rem;
}

.pub-authors .me {
  color: var(--text);
  font-weight: 600;
}

.pub-venue {
  color: var(--muted);
  font-size: 0.9rem;
  font-style: italic;
}

/* ---- Contact row ---- */
.contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  padding-top: 0.5rem;
}

.contact .dot {
  color: var(--muted);
}

.friend-link {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  body {
    padding: 2.5rem 1.25rem;
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }

  .intro-photo {
    order: -1;
  }

  .intro-photo img {
    margin: 0 auto;
    width: 160px;
    height: 160px;
  }

  .contact {
    justify-content: center;
  }

  .friend-link {
    text-align: center;
  }
}