/* ==========================================================================
   CUSTOM MINIMAL CSS FOR ACADEMIC WEBSITE
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS VARIABLES / DESIGN TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-text: #222;
  --color-text-muted: #555;
  --color-link: #2563eb;
  --color-link-hover: #1d4ed8;
  --color-bg: #fff;
  --color-bg-secondary: #f9fafb;
  --color-border: #e5e7eb;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Layout */
  --sidebar-width: 260px;
  --content-max-width: 720px;
  --container-max-width: 1100px;
}

/* --------------------------------------------------------------------------
   2. RESET / BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, h4, h5, h6, p, ul, ol, blockquote {
  margin: 0 0 var(--space-md) 0;
}

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

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

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

ul, ol {
  padding-left: var(--space-lg);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY
   -------------------------------------------------------------------------- */
h1 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
}

p {
  font-size: 1rem;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-small {
  font-size: 0.875rem;
}

blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: var(--space-md);
  margin-left: 0;
  color: var(--color-text-muted);
  font-style: italic;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg-secondary);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--color-bg-secondary);
  padding: var(--space-md);
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

pre code {
  background: none;
  padding: 0;
}

/* --------------------------------------------------------------------------
   4. LAYOUT
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.main-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: var(--space-2xl);
  padding: var(--space-2xl) 0;
  min-height: calc(100vh - 200px);
}

.main-layout.no-sidebar {
  grid-template-columns: 1fr;
}

@media (max-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

/* --------------------------------------------------------------------------
   5. HEADER / NAVIGATION
   -------------------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  background: var(--color-bg);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.site-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.site-title:hover {
  color: var(--color-link);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

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

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

@media (max-width: 600px) {
  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    gap: var(--space-md);
  }
}

/* --------------------------------------------------------------------------
   6. SIDEBAR / AUTHOR PROFILE
   -------------------------------------------------------------------------- */
.sidebar {
  position: sticky;
  top: var(--space-lg);
  align-self: start;
}

.author-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  margin-bottom: var(--space-md);
  object-fit: cover;
}

.author-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.author-bio {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.author-links {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.author-links li {
  margin-bottom: var(--space-sm);
}

.author-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

@media (max-width: 768px) {
  .sidebar {
    position: static;
    text-align: center;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
  }

  .author-avatar {
    margin: 0 auto var(--space-md);
  }

  .author-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
  }

  .author-links li {
    margin-bottom: 0;
  }
}

/* --------------------------------------------------------------------------
   7. CONTENT / PAGES
   -------------------------------------------------------------------------- */
.page-content {
  max-width: var(--content-max-width);
}

.page-title {
  margin-bottom: var(--space-lg);
}

.page-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
}

.page-content p {
  margin-bottom: var(--space-md);
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content ul, .page-content ol {
  margin-bottom: var(--space-md);
}

.page-content li {
  margin-bottom: var(--space-xs);
}

/* Resource links for research/presentations */
.resource-links {
  margin-top: var(--space-md);
  font-size: 0.9rem;
}

.resource-links a {
  margin-right: var(--space-lg);
}

/* --------------------------------------------------------------------------
   8. ARCHIVE ITEMS (Lists of research, posts, etc.)
   -------------------------------------------------------------------------- */
.archive-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.archive-item {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}

.archive-item:first-child {
  padding-top: 0;
}

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

.archive-item-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.archive-item-title a {
  color: var(--color-text);
}

.archive-item-title a:hover {
  color: var(--color-link);
}

.archive-item-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.archive-item-excerpt {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.archive-item-links {
  font-size: 0.875rem;
  margin-top: var(--space-sm);
}

.archive-item-links a {
  margin-right: var(--space-md);
}

/* Category headers for grouped archives */
.archive-category {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.archive-category:first-child {
  margin-top: 0;
}

/* --------------------------------------------------------------------------
   9. TABLES
   -------------------------------------------------------------------------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  background: var(--color-bg-secondary);
}

/* --------------------------------------------------------------------------
   10. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  margin-top: var(--space-2xl);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
}

.site-footer a {
  color: var(--color-text-muted);
}

.site-footer a:hover {
  color: var(--color-link);
}

/* --------------------------------------------------------------------------
   11. UTILITIES
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.clearfix::after {
  content: "";
  display: table;
  clear: both;
}

/* --------------------------------------------------------------------------
   12. CV PAGE
   -------------------------------------------------------------------------- */
.cv-entry {
  margin-bottom: var(--space-lg);
}

.cv-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.cv-date {
  color: var(--color-text-muted);
  font-style: italic;
  white-space: nowrap;
}

.cv-entry ul {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.cv-links {
  font-size: 0.9rem;
  margin-top: var(--space-sm);
}

.cv-links a {
  margin-right: var(--space-xs);
}

/* --------------------------------------------------------------------------
   13. 404 PAGE
   -------------------------------------------------------------------------- */
.error-page {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.error-page h1 {
  font-size: 4rem;
  margin-bottom: var(--space-md);
}