:root {
  --color-bg: #fafafa;
  --color-text: #333;
  --color-text-light: #666;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e5e5;
  --max-width: 720px;
}

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

html {
  overflow-y: scroll;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* Navigation */
.nav {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 2rem;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--color-text);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* Main content */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* Homepage */
.profile {
  display: flex;
  gap: 2rem;
  align-items: stretch;
  margin-bottom: 2rem;
}

.profile-photo {
  width: auto;
  max-width: 180px;
  object-fit: cover;
}

.profile-info h1 {
  font-size: 1.6rem;
  margin-bottom: 0.25rem;
}

.profile-info .role-affiliation {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.profile-info .email {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.bio {
  margin-bottom: 2rem;
}

/* News */
.news-list {
  list-style: none;
  margin-bottom: 2rem;
}

.news-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.news-item:last-child {
  border-bottom: none;
}

.news-date {
  color: var(--color-text-light);
  font-size: 0.9rem;
  min-width: 110px;
  flex-shrink: 0;
}

.news-text {
  font-size: 0.95rem;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.social-links a {
  color: var(--color-text-light);
}

/* Section headings */
h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* Publications */
.publications-list {
  margin-top: 1rem;
}

.publication {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

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

.publication .pub-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.publication .pub-authors {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.publication .pub-venue {
  color: var(--color-text-light);
  font-style: italic;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.publication .pub-links {
  font-size: 0.85rem;
}

.publication .pub-links a {
  margin-right: 0.75rem;
}

/* Blog */
.post-list {
  list-style: none;
}

.post-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post-item:last-child {
  border-bottom: none;
}

.post-item .date {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.post-item h3 {
  margin: 0.3rem 0;
}

.post-item .summary {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* Table of Contents */
.toc {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
}

.toc summary {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 0.5rem 0;
  user-select: none;
}

.toc summary:hover {
  color: var(--color-accent);
}

.toc[open] summary {
  margin-bottom: 0.75rem;
}

.toc > nav > ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc ul ul {
  margin: 0.25rem 0 0.25rem 0;
  padding-left: 1rem;
  list-style: none;
  border-left: 1px solid var(--color-border);
}

.toc li {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  line-height: 1.4;
  padding-left: 0.75rem;
  position: relative;
}

.toc li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-text-light);
}

.toc > nav > ul > li {
  margin-bottom: 0.6rem;
}

.toc a {
  color: var(--color-text);
}

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

/* Single post */
.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.post-header .date {
  color: var(--color-text-light);
}

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

.post-content p {
  margin-bottom: 1.2rem;
}

.post-content h2 {
  margin-top: 2rem;
}

.post-content ul, .post-content ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}

.post-content code {
  background: #f5f5f5;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-size: 0.85em;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

.post-content pre {
  background: #f8f8f8;
  border: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
  border: none;
}

/* Hugo syntax highlighting overrides */
.highlight {
  margin-bottom: 1.5rem;
}

.highlight pre {
  margin: 0;
  background: #f8f8f8;
  border: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
}

.highlight pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

/* GitHub-style alerts */
.alert {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid;
  border-radius: 4px;
}

.alert-title {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.alert-content p:first-child {
  margin-top: 0;
}

.alert p:last-child {
  margin-bottom: 0;
}

.alert-note {
  background: #eff6ff;
  border-color: #3b82f6;
}

.alert-note .alert-title {
  color: #1d4ed8;
}

.alert-tip {
  background: #f0fdf4;
  border-color: #22c55e;
}

.alert-tip .alert-title {
  color: #16a34a;
}

.alert-warning {
  background: #fffbeb;
  border-color: #f59e0b;
}

.alert-warning .alert-title {
  color: #d97706;
}

.alert-important {
  background: #fef2f2;
  border-color: #ef4444;
}

.alert-important .alert-title {
  color: #dc2626;
}

.alert-caution {
  background: #fefce8;
  border-color: #eab308;
}

.alert-caution .alert-title {
  color: #ca8a04;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 600px) {
  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

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

  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }

  .news-item {
    flex-direction: column;
    gap: 0.25rem;
  }

  .news-date {
    min-width: auto;
  }
}