/* ==========================================================================
   Michael Greenberger - Academic Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Earth tones color palette */
  --color-primary: #5D4E37;
  --color-primary-light: #7D6E57;
  --color-accent: #4A7C59;
  --color-accent-hover: #3A6249;
  --color-text: #3D3D3D;
  --color-text-light: #5A5A5A;
  --color-background: #FDFBF7;
  --color-background-alt: #F5F1E8;
  --color-border: #D4CFC5;

  /* Typography */
  --font-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Font sizes - fluid typography */
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: clamp(1.5rem, 1.25rem + 0.75vw, 1.75rem);
  --font-size-2xl: clamp(1.75rem, 1.5rem + 1vw, 2.25rem);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --max-width-content: 48rem;
  --container-padding: clamp(1rem, 5vw, 2rem);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* --------------------------------------------------------------------------
   2. CSS Reset / Base Styles
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

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

/* --------------------------------------------------------------------------
   3. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-primary);
  margin-top: 0;
}

h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: var(--font-size-xl);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

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

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

/* --------------------------------------------------------------------------
   4. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-sm) var(--space-md);
  z-index: 100;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* --------------------------------------------------------------------------
   5. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  background-color: var(--color-background-alt);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

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

.site-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-xs);
}

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

.site-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  margin: 0;
}

.site-affiliation {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin: 0;
}

/* Navigation */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  left: 0;
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.main-nav {
  margin-top: var(--space-md);
}

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

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--space-xs) 0;
  display: inline-block;
  position: relative;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-link.active {
  color: var(--color-accent);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.nav-cv {
  background: var(--color-primary);
  color: white !important;
  padding: var(--space-xs) var(--space-md);
  border-radius: 4px;
}

.nav-cv:hover,
.nav-cv:focus {
  background: var(--color-primary-light);
  text-decoration: none;
}

/* Mobile navigation */
@media (max-width: 639px) {
  .nav-toggle-label {
    display: block;
    position: absolute;
    top: var(--space-lg);
    right: var(--container-padding);
  }

  .site-header .container {
    position: relative;
  }

  .main-nav {
    display: none;
    margin-top: var(--space-lg);
  }

  .nav-toggle:checked ~ .main-nav {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-cv {
    display: inline-block;
    margin-top: var(--space-sm);
  }
}

/* --------------------------------------------------------------------------
   6. Main Content Area
   -------------------------------------------------------------------------- */
.main-content {
  padding: var(--space-2xl) 0;
  min-height: calc(100vh - 300px);
}

/* --------------------------------------------------------------------------
   7. Page-Specific Styles
   -------------------------------------------------------------------------- */

/* 7.1 Home/About */
.about-section {
  margin-bottom: var(--space-2xl);
}

.about-content {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .about-content {
    grid-template-columns: 280px 1fr;
    align-items: start;
  }
}

.about-photo {
  margin: 0;
}

.about-photo img {
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.about-photo figcaption {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-style: italic;
  margin-top: var(--space-sm);
  text-align: center;
}

.about-text h1 {
  margin-top: 0;
}

/* 7.2 Research */
.publication-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.publication {
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  background: var(--color-background-alt);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 8px 8px 0;
}

.publication-title {
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.publication-journal {
  font-style: italic;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.publication-link {
  display: inline-block;
  font-size: var(--font-size-sm);
  background: var(--color-accent);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  text-decoration: none;
}

.publication-link:hover,
.publication-link:focus {
  background: var(--color-accent-hover);
  color: white;
  text-decoration: none;
}

/* 7.3 Teaching */
.course-grid {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 480px) {
  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.course-card {
  padding: var(--space-lg);
  background: var(--color-background-alt);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.course-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
}

.course-term {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.syllabus-link {
  display: inline-block;
  font-size: var(--font-size-sm);
  background: var(--color-primary);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  text-decoration: none;
}

.syllabus-link:hover,
.syllabus-link:focus {
  background: var(--color-primary-light);
  color: white;
  text-decoration: none;
}

.resource-list {
  list-style: none;
  padding: 0;
}

.resource-list li {
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--color-background-alt);
  border-radius: 8px;
  border-left: 3px solid var(--color-primary);
}

/* 7.4 Book */
.book-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  padding: var(--space-2xl) var(--space-lg);
  background: var(--color-background-alt);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.book-header h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-sm);
}

.book-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  font-style: italic;
  margin: 0;
}

.book-content p {
  margin-bottom: var(--space-lg);
}

/* 7.5 Contact */
.contact-grid {
  display: grid;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

@media (min-width: 480px) {
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.contact-card {
  padding: var(--space-lg);
  background: var(--color-background-alt);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.contact-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.contact-card p {
  margin: 0;
}

.contact-note {
  font-style: italic;
  color: var(--color-text-light);
  margin-top: var(--space-xl);
}

/* --------------------------------------------------------------------------
   8. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-background-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  margin-top: var(--space-2xl);
}

.site-footer p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  text-align: center;
}

/* --------------------------------------------------------------------------
   9. Print Styles
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .skip-link {
    display: none;
  }

  body {
    font-size: 12pt;
    background: white;
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .publication {
    break-inside: avoid;
    border-left-color: black;
  }
}