:root {
  --primary: #403030;
  --primary-light: rgba(64, 48, 48, 0.1);
  --accent: #12957f;
  --accent-light: rgba(18, 149, 127, 0.15);
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #263238;
  --text-muted: #546e7a;
  --shadow-sm: 0 6px 18px rgba(17, 24, 39, 0.06);
  --radius-sm: 8px;
  --radius-md: 14px;
}

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

body {
  margin: 0;
  font-family:
    'Inter',
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

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

.container {
  width: min(960px, 90%);
  margin: 0 auto;
}

.page-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1 0 auto;
  padding-block: 3rem;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
  gap: 2rem;
}

.site-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.site-tagline {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-branding {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-nav {
  display: flex;
  gap: 0.75rem;
  flex-wrap: nowrap;
  align-items: center;
}

.site-nav a {
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus {
  background: var(--primary-light);
  color: var(--primary);
}

.site-nav a.active {
  background: var(--accent);
  color: white;
  text-decoration: none;
}

.hero {
  padding-block: 3.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-image {
  max-width: 220px;
  aspect-ratio: 1 / 1;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-content h1 {
  margin: 0;
  font-size: clamp(2rem, 2.8vw, 2.8rem);
  color: var(--primary);
}

.hero-tagline {
  margin: 0.5rem 0 1.5rem;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.hero-bio {
  max-width: 36rem;
  margin-bottom: 1.5rem;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 500;
  transition:
    border 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.hero-link-icon {
  font-size: 1.05rem;
  line-height: 1;
}

.hero-link-label {
  display: inline-block;
}

.hero-links a:hover,
.hero-links a:focus {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
  text-decoration: none;
}

.page-section {
  padding-block: 3rem;
}

.page-section h2 {
  margin-bottom: 2rem;
  font-size: clamp(1.6rem, 2.2vw, 2rem);
  color: var(--primary);
  position: relative;
}

.page-section h2::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 3.5rem;
  height: 3px;
  border-radius: 999px;
  background: var(--accent);
}

.timeline {
  display: grid;
  gap: 1.5rem;
}

.timeline-item {
  padding: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 24, 39, 0.04);
  box-shadow: var(--shadow-sm);
}

.timeline-years {
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.timeline-title {
  margin: 0;
  font-size: 1.2rem;
  color: var(--primary);
}

.timeline-focus,
.timeline-advisors {
  margin: 0.4rem 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.timeline-description {
  margin: 0.6rem 0 0;
}

.paper-groups {
  display: grid;
  gap: 2.5rem;
}

.paper-list {
  display: grid;
  gap: 1.5rem;
}

.paper-card {
  padding: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 24, 39, 0.05);
  box-shadow: var(--shadow-sm);
}

.paper-card .paper-title {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
}

.paper-card .paper-venue,
.paper-card .paper-authors {
  margin: 0.35rem 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.paper-card .paper-description {
  margin: 0.75rem 0 1rem;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.paper-link,
.button {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.95rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: rgba(18, 149, 127, 0.08);
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}

.button[disabled],
.copy-bibtex[disabled] {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
  transform: none;
  pointer-events: none;
}

.paper-link:hover,
.paper-link:focus,
.button:hover,
.button:focus {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  background: var(--accent);
  color: white;
}

.copy-bibtex {
  border-style: dashed;
}

.section-cta {
  margin-top: 2rem;
}

.awards .badge-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
}

.awards .badge {
  padding: 0.35rem 0.85rem;
  background: var(--primary-light);
  border-radius: 999px;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 500;
}

.skills-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.skill-group {
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 24, 39, 0.05);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.skill-group h3 {
  margin-top: 0;
  font-size: 1rem;
  color: var(--primary);
}

.skill-group ul {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  display: grid;
  gap: 0.4rem;
}

.skill-group li {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.papers-index .paper-group h2,
.papers-index .paper-group h3 {
  margin-bottom: 1rem;
}

.post-list {
  display: grid;
  gap: 1.5rem;
}

.post-card {
  padding: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 24, 39, 0.05);
  box-shadow: var(--shadow-sm);
}

.post-card .post-title {
  margin: 0 0 0.35rem;
  font-size: 1.3rem;
}

.post-card .post-meta {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.post-card .post-excerpt {
  margin: 0 0 1rem;
  color: var(--text);
}

.post-read-more {
  font-weight: 600;
}

.post-detail,
.paper-detail {
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 24, 39, 0.05);
  padding: min(5vw, 3rem);
  box-shadow: var(--shadow-sm);
}

.post-detail .post-title,
.paper-detail .paper-title {
  margin-top: 0;
  font-size: clamp(1.8rem, 2.6vw, 2.4rem);
  color: var(--primary);
}

.post-detail .post-meta,
.paper-detail .paper-publication {
  margin: 0.75rem 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.post-detail .post-summary,
.paper-detail .paper-summary {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  color: var(--text);
}

.back-nav {
  margin-bottom: 1rem;
}

.back-nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.paper-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.paper-bibtex {
  margin: 2rem 0 0;
}

.paper-bibtex pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.paper-content,
.post-content {
  display: grid;
  gap: 1rem;
  font-size: 1rem;
}

.paper-content h2,
.post-content h2 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.paper-content p,
.post-content p {
  margin: 0;
}

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding-block: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
    flex-wrap: wrap;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content h1 {
    font-size: 2.2rem;
  }

  .hero-bio {
    margin-inline: auto;
  }

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

  .timeline-item {
    text-align: left;
  }
}

@media (max-width: 640px) {
  .site-main {
    padding-block: 2.5rem;
  }

  .page-section {
    padding-block: 2.5rem;
  }

  .paper-detail,
  .post-detail {
    padding: 2rem 1.5rem;
  }
}