/* Newspaper-inspired minimal design with serif fonts */

/* Import serif fonts */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=Source+Serif+Pro:ital,wght@0,400;0,600;1,400&display=swap');

/* CSS Variables */
:root {
  /* Colors */
  --color-text: #1a1a1a;
  --color-text-secondary: #666;
  --color-background: #fefefe;
  --color-accent: #2c2c2c;
  --color-border: #ddd;
  --color-link: #1a1a1a;
  --color-link-hover: #666;
  
  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Serif Pro', Georgia, serif;
  --font-mono: 'Courier New', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Layout */
  --max-width: 800px;
  --line-height: 1.6;
  --line-height-heading: 1.2;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #f0f0f0;
    --color-text-secondary: #aaa;
    --color-background: #1a1a1a;
    --color-accent: #f0f0f0;
    --color-border: #444;
    --color-link: #f0f0f0;
    --color-link-hover: #ccc;
  }
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Navigation */
.navbar {
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(254, 254, 254, 0.95);
}

@media (prefers-color-scheme: dark) {
  .navbar {
    background-color: rgba(26, 26, 26, 0.95);
  }
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.nav-brand a {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-brand a:hover {
  color: var(--color-link-hover);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-md);
}

.nav-item {
  margin: 0;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  transition: all 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--color-link-hover);
  background-color: var(--color-border);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
}

.hamburger {
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: all 0.3s ease;
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: all 0.3s ease;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

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

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 60px;
    flex-direction: column;
    background-color: var(--color-background);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: var(--spacing-md) 0;
    gap: 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-item {
    margin: var(--spacing-xs) 0;
  }

  .nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
  }

  /* Hamburger animation */
  .nav-toggle.active .hamburger {
    background-color: transparent;
  }

  .nav-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
  }

  .nav-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
  }
}

/* Masthead */
.masthead {
  border-bottom: 2px solid var(--color-accent);
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-xl);
}

.masthead-content {
  text-align: center;
}

.site-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.site-subtitle {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text-secondary);
  margin: 0;
}

/* Content */
.content {
  display: grid;
  gap: var(--spacing-lg);
}

/* Main content */
.main-content {
  font-size: 1.1rem;
  line-height: 1.7;
}





/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
  scroll-margin-top: 80px; /* Account for sticky navigation */
}

h1 {
  font-size: 2rem;
  margin-top: var(--spacing-xl);
}

h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-xs);
}

h3 {
  font-size: 1.25rem;
}

h4, h5, h6 {
  font-size: 1.1rem;
}

/* Paragraphs and text */
p {
  margin-bottom: var(--spacing-md);
  text-align: justify;
  hyphens: auto;
}

/* Links */
a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.2s ease;
}

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

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* Definition lists for talks and publications */
dl {
  margin-bottom: var(--spacing-md);
}

dt {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 1rem;
}

dd {
  margin: 0 0 var(--spacing-sm) var(--spacing-lg);
  padding-left: var(--spacing-sm);
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

dd:last-child {
  margin-bottom: var(--spacing-md);
}

/* Blockquotes */
blockquote {
  font-style: italic;
  border-left: 3px solid var(--color-accent);
  padding-left: var(--spacing-md);
  margin: var(--spacing-md) 0;
  color: var(--color-text-secondary);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-border);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

pre {
  background-color: var(--color-border);
  padding: var(--spacing-md);
  border-radius: 4px;
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

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

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-md) auto;
  border: none;
  outline: none;
  box-shadow: none;
}

/* Article title */
.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
  line-height: 1.2;
  text-align: center;
}

/* Article metadata */
.article-meta {
  margin-bottom: var(--spacing-lg);
  margin-top: var(--spacing-md);
  text-align: right !important;
}

.article-date {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
  font-style: italic;
  text-align: right !important;
}

.article-author {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0;
  font-weight: 500;
  text-align: right !important;
}

.avatar {
  width: 150px;
  height: 150px;
  object-fit: cover;
  object-position: top;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Intro section layout */
.intro-section {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md) 0;
}

.intro-text {
  flex: 1;
  font-size: 1.1rem;
  line-height: 1.7;
}

.intro-photo {
  flex-shrink: 0;
  margin-top: var(--spacing-xs);
}

/* Mobile responsive for intro section */
@media (max-width: 768px) {
  .intro-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .intro-text {
    order: 2;
  }
  
  .intro-photo {
    order: 1;
    margin-top: 0;
  }
  
  .avatar {
    width: 120px;
    height: 120px;
  }
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
  font-size: 0.9em;
}

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

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

/* Table of contents */
.table-of-contents {
  background-color: var(--color-border);
  padding: var(--spacing-md);
  border-radius: 4px;
  margin-bottom: var(--spacing-lg);
}

.table-of-contents h2 {
  border: none;
  margin-top: 0;
  font-size: 1.1rem;
}

.table-of-contents ul {
  list-style: none;
  padding-left: 0;
}

.table-of-contents li {
  margin-bottom: var(--spacing-xs);
}

.table-of-contents a {
  text-decoration: none;
  color: var(--color-text);
}

.table-of-contents a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* Utility classes */
.highlight {
  background-color: #fff3cd;
  padding: 2px 4px;
  border-radius: 3px;
}

.button-a,
.contact > a {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  text-decoration: none;
  border: 1px solid var(--color-accent);
  border-radius: 3px;
  background-color: transparent;
  color: var(--color-text);
  transition: all 0.2s ease;
}

.button-a:hover,
.contact > a:hover {
  background-color: var(--color-accent);
  color: var(--color-background);
}

/* Responsive design */
@media (max-width: 768px) {
  :root {
    --max-width: 100%;
  }
  
  .container {
    padding: 0 var(--spacing-xs);
  }
  
  .site-title {
    font-size: 2rem;
  }
  
  .main-content {
    font-size: 1rem;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.35rem;
  }
  
  .masthead {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .site-title {
    font-size: 1.75rem;
  }
  
  .main-content {
    font-size: 0.95rem;
  }
  
  p {
    text-align: left;
  }
}

/* Print styles */
@media print {
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  .masthead {
    border-bottom: 1px solid #000;
  }
  
  .footer {
    border-top: 1px solid #000;
  }
  
  a {
    color: #000;
  }
}