:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f5f6f8;
  --text: #111827;
  --text-muted: #4b5563;
  --line: #e5e7eb;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
  --radius: 16px;
  --gap: 24px;
  --font-sans: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --transition: 200ms ease;
}

:root[data-theme="dark"],
body[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #111c33;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --line: #1e293b;
  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.12);
  --shadow: 0 16px 40px rgba(8, 47, 73, 0.4);
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--transition), color var(--transition);
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

p {
  margin: 0 0 1em;
}

h1,
h2,
h3 {
  margin: 0 0 0.75em;
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: clamp(2rem, 3vw, 2.75rem);
}

h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
}

h3 {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
}

svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

svg path,
svg circle,
svg line {
  fill: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 28px 0;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}

.utilities {
  display: flex;
  gap: 12px;
  align-items: center;
}

.search-control {
  position: relative;
}

.search-popover {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  width: min(320px, 90vw);
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: none;
  flex-direction: column;
  gap: 12px;
  z-index: 30;
}

.search-popover.is-open {
  display: flex;
}

.search-field input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  transition: border var(--transition), box-shadow var(--transition);
}

.search-field input::placeholder {
  color: var(--text-muted);
}

.search-field input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.search-results {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  max-height: 260px;
  overflow-y: auto;
}

.search-result a {
  display: grid;
  gap: 4px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  text-decoration: none;
  transition: background var(--transition), border var(--transition), color var(--transition);
}

.search-result a:hover,
.search-result a:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.search-result-title {
  font-weight: 600;
  color: var(--text);
}

.search-result-meta {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.search-result-snippet {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.search-empty {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 8px 0 0;
}

.language-control {
  position: relative;
}

.language-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 200px;
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: none;
  z-index: 25;
}

.language-menu.is-open {
  display: grid;
  gap: 8px;
}

.language-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition), border var(--transition), color var(--transition);
}

.language-option:hover,
.language-option:focus-visible {
  background: var(--accent-soft);
  color: var(--text);
  outline: none;
}

.language-option.is-active {
  border-color: var(--accent);
  color: var(--text);
}

.language-option-title {
  font-size: 0.95rem;
}

.theme-control {
  position: relative;
}

.theme-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 220px;
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: none;
  z-index: 25;
}

.theme-menu.is-open {
  display: grid;
  gap: 8px;
}

.theme-option {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4px 8px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition), border var(--transition), color var(--transition);
}

.theme-option:hover,
.theme-option:focus-visible {
  background: var(--accent-soft);
  color: var(--text);
  outline: none;
}

.theme-option.is-active {
  border-color: var(--accent);
  color: var(--text);
}

.theme-option.is-active::after {
  content: "✓";
  grid-column: 2;
  grid-row: 1 / span 2;
  font-weight: 600;
  color: var(--accent);
}

.theme-option-title {
  grid-column: 1;
  font-size: 0.95rem;
}

.theme-option-desc {
  grid-column: 1;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border var(--transition);
}

.icon-button:hover,
.icon-button:focus-visible {
  color: var(--text);
  border-color: var(--accent);
  outline: none;
}

.icon-button:focus-visible {
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.profile-grid {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: 48px;
  padding: 64px 0;
}

.profile-card {
  padding: 32px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.profile-photo {
  width: 168px;
  aspect-ratio: 1;
  border-radius: 50%;
  margin-bottom: 24px;
  object-fit: cover;
  object-position: center;
  border: 4px solid rgba(148, 163, 184, 0.3);
}

.profile-name {
  margin-bottom: 12px;
}

.profile-role {
  margin: 0 0 4px;
  color: var(--text-muted);
  font-weight: 600;
}

.profile-location {
  margin: 0 0 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  background: var(--bg);
  transition: transform var(--transition), border var(--transition), color var(--transition);
}

.social-links a:hover,
.social-links a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.profile-content {
  display: grid;
  gap: 48px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--accent);
}

.hero-link-icon {
  width: 20px;
  height: 20px;
}

.hero-link-icon path {
  fill: currentColor;
  stroke: none;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
}

.list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.list li {
  padding-left: 16px;
  position: relative;
  color: var(--text-muted);
}

.list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--line);
}

.timeline li {
  padding-left: 24px;
  margin-bottom: 28px;
  position: relative;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}

.timeline-year {
  margin: 0 0 6px;
  font-weight: 700;
  color: var(--text);
}

.timeline-text {
  margin: 0;
  color: var(--text-muted);
}

.section-block {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}

.section-subtitle {
  margin: 0;
  color: var(--text-muted);
}

.section-actions {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
}

.section-action-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.section-action-link:hover,
.section-action-link:focus {
  text-decoration: underline;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: var(--surface);
  color: var(--text-muted);
  text-align: center;
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.news-item {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  transition: transform var(--transition), border var(--transition);
}

.news-item:hover,
.news-item:focus-within {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.publications-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.publication-item {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  transition: transform var(--transition), border var(--transition);
}

.publication-item:hover,
.publication-item:focus-within {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.publication-title {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 700;
}

.publication-meta {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: baseline;
}

.publication-meta span + span {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
}

.publication-meta span + span::before {
  content: "•";
  color: var(--text-muted);
}

.publication-description {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.publication-link {
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--accent);
}

.news-meta {
  display: flex;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.news-title {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 1.05rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.contact-grid h3 {
  margin: 0 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.contact-icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

address {
  font-style: normal;
  line-height: 1.6;
  color: var(--text-muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  background: var(--bg);
}

.footer-inner {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  .header-inner {
    grid-template-columns: 1fr;
    gap: 16px;
    text-align: center;
  }

  .site-nav {
    justify-content: center;
    flex-wrap: wrap;
  }

  .utilities {
    justify-content: center;
  }

  .profile-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .profile-card {
    align-items: center;
  }

  .profile-content {
    gap: 32px;
  }

  .hero-text {
    text-align: left;
  }

  .details-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 18px;
  }

  .profile-card {
    padding: 24px;
  }

  .profile-content {
    gap: 24px;
  }

  .news-item {
    padding: 20px;
  }

  .publication-item {
    padding: 20px;
  }

  .search-popover {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: min(360px, 92vw);
  }

  .language-menu {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: min(320px, 92vw);
  }
}