:root {
  --bg: #ffffff;
  --bg-soft: #f8f9fa;
  --text: #1a1a1a;
  --text-secondary: #333333;
  --text-muted: #666666;
  --accent: #0366d6;
  --accent-hover: #0550ae;
  --border: #eaecef;
  --radius: 4px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-space: 2rem;
  --font: Georgia, "Times New Roman", Times, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1.5rem;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

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

::selection {
  background: rgba(3, 102, 214, 0.15);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  color: #ffffff;
  background: var(--text);
  transform: translateY(-150%);
  transition: transform 150ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.shell {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 4rem;
  padding-block: 3.5rem;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 2rem;
  align-self: start;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}

.site-name {
  margin: 0 0 0.2rem;
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.site-tagline {
  margin: 0 0 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.site-tagline a {
  color: inherit;
  text-decoration: none;
}

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

.site-affiliation {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: var(--font-sans);
}

.contact-list {
  display: grid;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 1rem;
}

.contact-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-secondary);
}

.contact-icon {
  width: 1em;
  height: 1em;
  flex: none;
}

.contact-list a:hover {
  color: var(--accent);
}

/* Main content */
.main {
  min-width: 0;
}

.lead {
  margin: 0 0 2.5rem;
  color: var(--text);
  font-size: 1.1rem;
  line-height: 1.7;
  max-width: 70ch;
  text-wrap: pretty;
}

.about-text {
  margin: 0;
  color: var(--text);
  font-size: 1.2rem;
  line-height: 1.7;
  max-width: 70ch;
  text-wrap: pretty;
}

.section {
  margin-bottom: var(--section-space);
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--text);
  font-family: var(--font-sans);
}

.section-body {
  color: var(--text-secondary);
}

.section-body p {
  margin: 0 0 1.15rem;
  max-width: 70ch;
  text-wrap: pretty;
}

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

/* Entries (research, projects) */
.entry {
  margin-bottom: 1.5rem;
}

.entry:last-child {
  margin-bottom: 0;
}

.entry-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 0.25rem;
}

.entry-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  font-family: var(--font);
}

.entry-title a {
  color: inherit;
}

.entry-title a:hover {
  color: var(--accent);
}

.entry-alias {
  margin-left: 0.35rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 400;
  font-family: var(--font-sans);
}

.entry-meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.entry-org {
  margin: 0 0 0.35rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.entry-body {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 70ch;
  text-wrap: pretty;
}

.entry-honors {
  margin: 0.75rem 0 0;
  color: var(--text);
  font-size: 1rem;
  font-style: italic;
  line-height: 1.7;
  max-width: 70ch;
  text-wrap: pretty;
}

.entry-tags {
  display: inline;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.entry-tags li {
  display: inline;
}

.entry-tags li:not(:last-child)::after {
  content: " · ";
  color: var(--border);
}

/* Skills */
.skill-group {
  margin-bottom: 0.9rem;
}

.skill-group:last-child {
  margin-bottom: 0;
}

.skill-name {
  margin: 0 0 0.2rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font-sans);
}

.skill-items {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 70ch;
  text-wrap: pretty;
}

/* Courses */
.course-group {
  margin-bottom: 1.25rem;
}

.course-group:last-child {
  margin-bottom: 0;
}

.course-category {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font-sans);
}

.course-list {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

/* Lists */
.plain-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.plain-list li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 70ch;
  text-wrap: pretty;
}

.plain-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* Footer */
.page-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 800px) {
  .page {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding-block: 2rem;
  }

  .sidebar {
    position: static;
    display: flex;
    align-items: center;
    gap: 1.25rem;
  }

  .avatar {
    width: 90px;
    height: 90px;
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .sidebar-info {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .sidebar {
    flex-direction: column;
    text-align: center;
  }

  .entry-header {
    flex-direction: column;
    gap: 0.25rem;
  }

  .skill-group {
    margin-bottom: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}