:root {
  --ut-orange: #BF5700;
  --ut-orange-hover: #A34A00;
  --ut-orange-light: #E87511;
  --bg: #ffffff;
  --bg-alt: #f9f9f9;
  --text: #333333;
  --text-muted: #666666;
  --heading: #1a1a1a;
  --border: #ddd;
  --nav-bg: #ffffff;
  --nav-shadow: 0 1px 3px rgba(0,0,0,0.08);
  --link: var(--ut-orange);
  --link-hover: var(--ut-orange-hover);
  --code-bg: #f4f4f4;
  --toggle-text: #555;
}

[data-theme="dark"] {
  --bg: #1a1a1a;
  --bg-alt: #222222;
  --text: #d8d8d8;
  --text-muted: #999999;
  --heading: #eeeeee;
  --border: #3a3a3a;
  --nav-bg: #1e1e1e;
  --nav-shadow: 0 1px 3px rgba(0,0,0,0.3);
  --link: var(--ut-orange-light);
  --link-hover: #ff9a3c;
  --code-bg: #2a2a2a;
  --toggle-text: #aaa;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.2s, color 0.2s;
}

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

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

h1, h2, h3, h4 {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--heading);
  line-height: 1.3;
  margin-top: 0;
}

h1 { font-size: 28px; margin-bottom: 4px; }
h2 { font-size: 22px; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 2px solid var(--ut-orange); }
h3 { font-size: 18px; margin-bottom: 8px; }

/* NAV */
nav {
  background: var(--nav-bg);
  border-bottom: 3px solid var(--ut-orange);
  box-shadow: var(--nav-shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.2s;
}

.nav-inner {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-name {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--heading);
  text-decoration: none;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--link);
  text-decoration: none;
  border-bottom-color: var(--ut-orange);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 16px;
  color: var(--toggle-text);
  transition: border-color 0.15s, color 0.15s;
  line-height: 1;
}

.theme-toggle:hover {
  border-color: var(--ut-orange);
  color: var(--ut-orange);
}

/* CONTAINER */
.container {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 24px;
}

main {
  padding: 40px 0 60px;
}

/* PROFILE */
.profile {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  margin-bottom: 40px;
}

.profile-photo {
  flex-shrink: 0;
}

.profile-photo img {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.profile-info h1 {
  margin-bottom: 2px;
}

.profile-info .title {
  font-size: 17px;
  color: var(--text-muted);
  margin: 0 0 2px;
}

.profile-info .affiliation {
  font-size: 15px;
  color: var(--text-muted);
  margin: 0 0 16px;
}

.profile-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 15px;
}

.profile-contact li {
  margin-bottom: 4px;
}

.profile-contact li span {
  color: var(--text-muted);
  margin-right: 4px;
}

/* SECTIONS */
section {
  margin-bottom: 40px;
}

section p {
  margin-top: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

/* CV */
.cv-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ut-orange);
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s;
  margin-bottom: 32px;
}

.cv-download:hover {
  background: var(--ut-orange-hover);
  color: #ffffff;
  text-decoration: none;
}

.cv-entry {
  margin-bottom: 20px;
}

.cv-entry h3 {
  margin-bottom: 2px;
}

.cv-entry .meta {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.cv-entry ul {
  margin: 6px 0 0;
  padding-left: 20px;
}

.cv-entry li {
  margin-bottom: 4px;
  font-size: 15px;
}

.cv-skills {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.cv-coursework {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px 24px;
}

.cv-coursework li {
  font-size: 15px;
}

ul.clean {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul.clean li {
  margin-bottom: 4px;
}

.cv-tests li {
  margin-bottom: 4px;
  font-size: 15px;
}

/* REPLICATION */
.dataset-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 16px;
  transition: background-color 0.2s, border-color 0.2s;
}

.dataset-card h3 {
  margin-bottom: 4px;
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  font-size: 14px;
  color: var(--text-muted);
  transition: border-color 0.2s;
}

.footer-inner {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* RESPONSIVE */
@media (max-width: 640px) {
  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .profile-photo img {
    width: 150px;
    height: 150px;
  }

  .nav-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 24px;
    gap: 8px;
  }

  .nav-links {
    gap: 16px;
  }

  .cv-skills {
    grid-template-columns: 1fr;
  }

  .cv-coursework {
    grid-template-columns: 1fr 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 4px;
    text-align: center;
  }
}

/* PRINT */
@media print {
  nav, .theme-toggle, .cv-download { display: none !important; }
  body { background: white; color: black; font-size: 12px; }
  .container { max-width: 100%; }
  h2 { border-bottom-color: #333; }
  a { color: #333; }
  footer { display: none; }
}