:root {
  color-scheme: dark;
  --bg: #0f1115;
  --section: #181c23;
  --section-soft: #202733;
  --text: #f5f5f5;
  --muted: #b9c0cc;
  --beige: #d8c3a5;
  --green: #2fa572;
  --blue: #4d8dff;
  --charcoal: #222222;
  --glass: rgba(24, 28, 35, 0.68);
  --border: rgba(216, 195, 165, 0.18);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
  --radius: 8px;
  --transition: 240ms ease;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f8f6f1;
  --section: #eadbc8;
  --section-soft: #ffffff;
  --text: #222222;
  --muted: #5f625f;
  --beige: #a78358;
  --green: #1f5e4a;
  --blue: #1e4d8c;
  --glass: rgba(255, 255, 255, 0.72);
  --border: rgba(31, 94, 74, 0.14);
  --shadow: 0 24px 70px rgba(54, 43, 28, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--green) 18%, transparent), transparent 30rem),
    radial-gradient(circle at 80% 10%, color-mix(in srgb, var(--blue) 18%, transparent), transparent 26rem),
    var(--bg);
  color: var(--text);
  transition: background-color var(--transition), color var(--transition);
}

body,
button,
input {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-shell {
  min-height: 100vh;
  overflow: hidden;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 32px));
  margin: 18px auto 0;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--glass) 88%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.02rem;
  line-height: 1.1;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
  margin-top: 3px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.nav-links a {
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 10px 12px;
  transition: color var(--transition), background-color var(--transition);
}

.nav-links a:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--green) 14%, transparent);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 56px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--section-soft);
  color: var(--text);
  cursor: pointer;
}

.toggle-track {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 42px;
  color: var(--muted);
}

.toggle-track::before {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green), var(--blue));
  transition: transform var(--transition);
}

[data-theme="light"] .toggle-track::before {
  transform: translateX(20px);
}

.toggle-icon {
  position: relative;
  z-index: 1;
  width: 20px;
  text-align: center;
  font-size: 0.78rem;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 900px);
  gap: 32px;
  align-items: center;
  width: min(1180px, calc(100% - 32px));
  min-height: calc(100svh - 86px);
  margin: 0 auto;
  padding: 86px 0 54px;
}

.hero-pattern {
  position: absolute;
  inset: 20px -80px 18px;
  z-index: -1;
  opacity: 0.72;
  background:
    linear-gradient(120deg, transparent 0 28%, color-mix(in srgb, var(--green) 26%, transparent) 28.2% 28.6%, transparent 29%),
    linear-gradient(60deg, transparent 0 34%, color-mix(in srgb, var(--blue) 24%, transparent) 34.2% 34.6%, transparent 35%),
    radial-gradient(circle at 20% 35%, color-mix(in srgb, var(--beige) 20%, transparent) 0 3px, transparent 4px),
    radial-gradient(circle at 40% 50%, color-mix(in srgb, var(--green) 32%, transparent) 0 4px, transparent 5px),
    radial-gradient(circle at 58% 28%, color-mix(in srgb, var(--blue) 30%, transparent) 0 3px, transparent 4px),
    radial-gradient(circle at 72% 60%, color-mix(in srgb, var(--beige) 22%, transparent) 0 4px, transparent 5px);
  background-size: 280px 220px, 340px 260px, 240px 180px, 280px 220px, 300px 240px, 360px 260px;
  mask-image: radial-gradient(circle at 45% 40%, #000 0 52%, transparent 78%);
}

.hero-content {
  max-width: 900px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 24px;
  font-size: clamp(3.3rem, 8vw, 6.9rem);
  line-height: 0.94;
}

.hero-copy {
  max-width: 660px;
  color: var(--muted);
  font-size: clamp(1.06rem, 2vw, 1.32rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button,
.chat-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0 18px;
  font-weight: 800;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.button:hover,
.chat-form button:hover {
  transform: translateY(-2px);
}

.button.primary,
.chat-form button {
  background: linear-gradient(135deg, var(--green), var(--blue));
  color: white;
  box-shadow: 0 16px 34px color-mix(in srgb, var(--blue) 22%, transparent);
}

.button.secondary {
  border-color: var(--border);
  background: var(--glass);
  color: var(--text);
  backdrop-filter: blur(14px);
}

.glass {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.section {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 86px 0;
}

.intro-band {
  width: 100%;
  max-width: none;
  padding-inline: max(16px, calc((100% - 1180px) / 2));
  background: color-mix(in srgb, var(--section) 72%, transparent);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.1rem, 4vw, 4rem);
  line-height: 1;
}

.profile-grid,
.research-grid,
.note-grid,
.social-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.profile-card,
.research-card,
.publication-card,
.note-card,
.social-card {
  position: relative;
  min-height: 250px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: color-mix(in srgb, var(--section-soft) 88%, transparent);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.profile-card:hover,
.research-card:hover,
.publication-card:hover,
.note-card:hover,
.social-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--green) 48%, var(--border));
  box-shadow: var(--shadow);
}

.profile-card span {
  display: inline-block;
  margin-bottom: 52px;
  color: var(--beige);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
}

.profile-card h3,
.research-card h3,
.publication-card h3,
.note-card h3,
.social-card h3 {
  margin-bottom: 12px;
  font-size: 1.45rem;
  line-height: 1.16;
}

.profile-card p,
.research-card p,
.publication-card p,
.note-card p,
.social-card p,
.timeline-detail p {
  color: var(--muted);
  line-height: 1.65;
}

.card-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 78px;
}

.card-topline span,
.publication-card span,
.note-card span,
.social-card span,
.class-heading span {
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.card-topline b {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--blue) 18%, transparent);
  color: var(--blue);
  font-size: 0.78rem;
}

.timeline-section {
  display: grid;
  grid-template-columns: 0.82fr 1fr;
  gap: 26px 48px;
  align-items: start;
}

.timeline-section .section-heading {
  grid-column: 1 / -1;
  margin-bottom: 8px;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-item {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--section-soft);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), background-color var(--transition);
}

.timeline-item:hover,
.timeline-item.active {
  transform: translateX(5px);
  border-color: color-mix(in srgb, var(--blue) 50%, var(--border));
  background: color-mix(in srgb, var(--blue) 12%, var(--section-soft));
}

.timeline-item span {
  display: block;
  margin-bottom: 8px;
  color: var(--beige);
  font-weight: 800;
}

.timeline-item strong {
  display: block;
}

.timeline-detail {
  min-height: 268px;
  padding: 32px;
}

.timeline-detail h3 {
  margin-bottom: 18px;
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1;
}

.section-split {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 34px;
  align-items: start;
}

.section-split .section-heading {
  position: sticky;
  top: 112px;
}

.publication-list {
  display: grid;
  gap: 16px;
}

.publication-card {
  min-height: 220px;
}

.publication-card a {
  display: inline-flex;
  margin-top: 12px;
  color: var(--blue);
  font-weight: 800;
}

.note-card {
  min-height: 230px;
}

.class-notes {
  display: grid;
  gap: 24px;
}

.class-column {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--section) 54%, transparent);
  padding: 22px;
}

.class-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.class-heading h3 {
  margin: 0;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.note-grid.compact .note-card {
  min-height: 220px;
}

.social-section {
  padding-top: 54px;
}

.social-card {
  min-height: 180px;
}

.social-card p {
  color: var(--beige);
  font-size: 1.1rem;
  font-weight: 800;
}

.ai-section {
  padding-bottom: 104px;
}

.ai-chat {
  max-width: 850px;
  padding: 18px;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  padding: 0 0 16px;
}

.chat-header img {
  width: 42px;
  height: 42px;
}

.chat-header strong,
.chat-header span {
  display: block;
}

.chat-header span {
  color: var(--muted);
  font-size: 0.9rem;
}

.chat-stream {
  display: grid;
  gap: 12px;
  min-height: 256px;
  padding: 22px 0;
}

.message {
  max-width: min(78%, 620px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  line-height: 1.55;
}

.message.assistant {
  justify-self: start;
  background: color-mix(in srgb, var(--section-soft) 86%, transparent);
}

.message.user {
  justify-self: end;
  background: linear-gradient(135deg, color-mix(in srgb, var(--green) 82%, #000), color-mix(in srgb, var(--blue) 82%, #000));
  color: white;
}

.chat-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.chat-form input {
  min-width: 0;
  min-height: 50px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--section-soft);
  color: var(--text);
  outline: none;
  padding: 0 16px;
}

.chat-form input:focus {
  border-color: var(--blue);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  border-top: 1px solid var(--border);
  padding: 28px 0 42px;
  color: var(--muted);
}

.footer-brand {
  color: var(--text);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

[data-animate] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 620ms ease, transform 620ms ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .topbar {
    align-items: flex-start;
  }

  .nav-links {
    display: none;
  }

  .timeline-section,
  .section-split {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 70px;
  }

  .profile-grid,
  .research-grid,
  .note-grid,
  .social-grid {
    grid-template-columns: 1fr 1fr;
  }

  .section-split .section-heading {
    position: static;
  }
}

@media (max-width: 660px) {
  .topbar {
    width: min(100% - 20px, 1180px);
    margin-top: 10px;
  }

  .brand strong {
    font-size: 0.94rem;
  }

  .brand small {
    font-size: 0.72rem;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  h1 {
    font-size: clamp(2.8rem, 17vw, 4.2rem);
  }

  .hero,
  .section {
    width: min(100% - 28px, 1180px);
  }

  .section {
    padding: 64px 0;
  }

  .intro-band {
    width: 100%;
    padding-inline: 14px;
  }

  .profile-grid,
  .research-grid,
  .note-grid,
  .social-grid {
    grid-template-columns: 1fr;
  }

  .profile-card,
  .research-card,
  .publication-card,
  .note-card,
  .social-card {
    min-height: auto;
  }

  .class-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .profile-card span,
  .card-topline {
    margin-bottom: 38px;
  }

  .message {
    max-width: 92%;
  }

  .chat-form {
    grid-template-columns: 1fr;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}