:root {
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --primary-light: #eff6ff;
  --accent: #0284c7;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --gold-bg: #fefce8;
  --gold-border: #fef08a;
  --gold-text: #854d0e;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65;
  color: var(--text-main);
  background-color: var(--bg-page);
  -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.nav-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links .nav-cv-btn {
  padding: 6px 14px;
  border-radius: 6px;
  background: var(--text-main);
  color: #fff !important;
  font-weight: 600;
}

.nav-links .nav-cv-btn:hover {
  background: var(--primary);
}

/* Container */
.container {
  max-width: 960px;
  margin: 32px auto 60px;
  padding: 0 20px;
}

/* Hero Section */
.hero-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

.hero-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.hero-section h1 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 8px;
}

.affiliation {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-sub);
  font-size: 0.9rem;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.btn:hover {
  background: var(--border-light);
  border-color: #cbd5e1;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
}

.btn-outline {
  font-weight: 600;
  border-color: #cbd5e1;
}

.icon {
  width: 16px;
  height: 16px;
}

.orcid-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: #a6ce39;
  color: white;
  border-radius: 50%;
  font-size: 10px;
  font-weight: bold;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 40px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}
.card p {
  text-align: justify;
  margin-bottom: 14px;
  color: var(--text-muted);
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-light);
}

h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.date-badge {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
  background: var(--border-light);
  padding: 3px 10px;
  border-radius: 6px;
}

.section-intro {
  color: var(--text-muted);
  margin-bottom: 18px;
}

/* Research Box */
.thesis-box {
  background: #f8fafc;
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin-bottom: 18px;
}

.thesis-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
}

.thesis-box h3 {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-main);
  margin-top: 4px;
}

.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.subcard {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.subcard h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.subcard ul, .clean-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.subcard li::before {
  content: "•";
  color: var(--primary);
  font-weight: bold;
  margin-right: 8px;
}

/* Publications */
.subsection-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-sub);
  margin: 28px 0 14px;
}

.pub-item {
  display: flex;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-light);
  align-items: baseline;
}

.pub-item:last-of-type {
  border-bottom: none;
}

.pub-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.talk-tag {
  background: #f1f5f9;
  color: var(--text-muted);
}

.pub-title {
  font-weight: 600;
  color: var(--text-main);
  font-size: 0.98rem;
  margin-bottom: 2px;
}

.pub-authors {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pub-venue {
  color: var(--text-sub);
  font-size: 0.88rem;
  font-style: italic;
}

/* Awards */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 10px;
}

.award-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  background: #ffffff;
}

.award-amount {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.award-title {
  font-weight: 700;
  font-size: 0.92rem;
  margin-bottom: 4px;
}

.award-desc {
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.4;
}

/* Teaching */
.teaching-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.teaching-item {
  display: flex;
  gap: 20px;
  padding: 14px 18px;
  background: #f8fafc;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  align-items: center;
}

.teaching-meta {
  min-width: 140px;
}

.hours {
  display: block;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--primary);
}

.level {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-sub);
}

.teaching-info h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.teaching-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Timeline */
.timeline {
  position: relative;
  border-left: 2px solid var(--border);
  margin-left: 8px;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.timeline-item {
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -31px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--primary-light);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.timeline-header h4 {
  font-size: 1.05rem;
  font-weight: 700;
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
}

.timeline-place {
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.honors-badge-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 8px;
}

.badge-gold {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--gold-bg);
  border: 1px solid var(--gold-border);
  color: var(--gold-text);
  padding: 3px 10px;
  border-radius: 6px;
  width: fit-content;
}

.timeline-details {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Activities & Experience */
.clean-list li {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  line-height: 1.5;
}

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

.exp-item {
  padding-bottom: 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.exp-item:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}

.exp-header h4 {
  font-size: 1.05rem;
  font-weight: 700;
}

.exp-company {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
}

.exp-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
}

.exp-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
}

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

.skill-category {
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 14px 16px;
}

.skill-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 4px;
}

.skill-category p {
  font-size: 0.9rem;
  color: var(--text-main);
  font-weight: 500;
}

/* Footer */
.footer {
  text-align: center;
  padding: 24px 0 10px;
  color: var(--text-sub);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 12px;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
  .hero-section, .card {
    padding: 24px 20px;
  }
  .hero-section h1 {
    font-size: 1.9rem;
  }
  .grid-2col, .awards-grid, .skills-grid {
    grid-template-columns: 1fr;
  }
  .teaching-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .timeline-header {
    flex-direction: column;
    gap: 2px;
  }
}