/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #333;
  background: #fff;
}

a {
  color: #2c5282;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* === Container === */
.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Navbar === */
.navbar {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  z-index: 100;
  padding: 12px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1a202c;
}

.nav-title:hover {
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: #4a5568;
  font-size: 0.9rem;
}

.nav-links a:hover {
  color: #2c5282;
  text-decoration: none;
}

.nav-toggle-checkbox {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-label span {
  display: block;
  width: 22px;
  height: 2px;
  background: #333;
  transition: 0.3s;
}

/* === Sections === */
.section {
  padding: 48px 0;
  border-bottom: 1px solid #f0f0f0;
}

.section:last-child {
  border-bottom: none;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 24px;
}

/* === Hero / About === */
.hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid #f0f0f0;
}

.hero-inner {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.hero-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.hero-info h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #1a202c;
  margin-bottom: 4px;
}

.hero-info .tagline {
  color: #718096;
  font-size: 1rem;
  margin-bottom: 12px;
}

.hero-info .bio {
  margin-bottom: 16px;
  color: #4a5568;
}

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

.hero-links a {
  font-size: 0.9rem;
  padding: 6px 14px;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  color: #4a5568;
  transition: border-color 0.2s;
}

.hero-links a:hover {
  border-color: #2c5282;
  color: #2c5282;
  text-decoration: none;
}

/* === News === */
.news-list {
  list-style: none;
}

.news-list li {
  padding: 6px 0;
  display: flex;
  gap: 16px;
}

.news-date {
  color: #718096;
  font-size: 0.9rem;
  min-width: 90px;
  flex-shrink: 0;
}

/* === Cards (projects, blog) === */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 20px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: #cbd5e0;
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.card h3 a {
  color: #1a202c;
}

.card h3 a:hover {
  color: #2c5282;
  text-decoration: none;
}

.card p {
  color: #4a5568;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  background: #edf2f7;
  color: #4a5568;
  font-size: 0.78rem;
  padding: 2px 10px;
  border-radius: 12px;
}

/* === Publications === */
.pub-list {
  list-style: none;
}

.pub-list li {
  padding: 10px 0;
  border-bottom: 1px solid #f7fafc;
}

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

.pub-title {
  font-weight: 600;
  color: #1a202c;
}

.pub-venue {
  color: #718096;
  font-size: 0.9rem;
}

.pub-links a {
  font-size: 0.85rem;
  margin-right: 12px;
}

/* === Teaching & Awards === */
.award-list, .course-list {
  list-style: none;
}

.award-list li {
  padding: 4px 0;
}

.course-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.course-list li {
  background: #edf2f7;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.9rem;
  color: #4a5568;
}

/* === Page Content === */
.page-content {
  padding: 48px 0;
}

.page-content h1 {
  font-size: 1.6rem;
  margin-bottom: 32px;
  color: #1a202c;
}

/* === Post / Project Detail === */
.detail-header {
  margin-bottom: 32px;
}

.detail-header h1 {
  font-size: 1.6rem;
  color: #1a202c;
  margin-bottom: 8px;
}

.detail-meta {
  color: #718096;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.detail-content {
  line-height: 1.8;
}

.detail-content h2 {
  font-size: 1.25rem;
  margin: 32px 0 12px;
  color: #1a202c;
}

.detail-content h3 {
  font-size: 1.1rem;
  margin: 24px 0 8px;
  color: #1a202c;
}

.detail-content p {
  margin-bottom: 16px;
}

.detail-content ul, .detail-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.detail-content li {
  margin-bottom: 4px;
}

.detail-content code {
  background: #f7fafc;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
}

.detail-content pre {
  background: #f7fafc;
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.detail-content pre code {
  padding: 0;
  background: none;
}

.detail-content img {
  border-radius: 6px;
  margin: 16px 0;
}

.back-link {
  display: inline-block;
  margin-top: 32px;
  font-size: 0.9rem;
  color: #718096;
}

.back-link:hover {
  color: #2c5282;
}

.view-all {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.9rem;
}

/* === Footer === */
.site-footer {
  padding: 32px 0;
  text-align: center;
  color: #a0aec0;
  font-size: 0.85rem;
  border-top: 1px solid #f0f0f0;
}

/* === Placeholder === */
.placeholder-text {
  color: #a0aec0;
  font-style: italic;
}

/* === Responsive === */
@media (max-width: 768px) {
  .nav-toggle-label {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid #e2e8f0;
    padding: 8px 24px;
  }

  .nav-toggle-checkbox:checked ~ .nav-links {
    display: flex;
  }

  .nav-links li {
    padding: 8px 0;
  }

  .hero-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

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

  .hero-photo {
    width: 130px;
    height: 130px;
  }
}