/*
  main.css – Centralized global styles and variables for the site
  Design system based on description.md
*/

:root {
  /* Colors */
  --color-bg: #fff;
  --color-text-main: #444;
  --color-text-heading: #000;
  --color-text-nav: #333;
  --color-accent: #1ca7ec; /* Example accent blue, adjust as needed */
  --color-accent-tint: #e6f6fd;
  --color-divider: rgba(0,0,0,0.10);
  --color-shadow: rgba(0,0,0,0.13);
  --color-meta: #777;
  --color-light-gray: #f9f9f9;
  --color-border: #ccc;
  --color-timeline: #ddd;
  --color-success: #27ae60;
  --color-error: #e74c3c;
  --color-btn-hover: #178fc2;

  /* Typography */
  --font-main: 'Inter', 'Helvetica Neue', Arial, 'system-ui', sans-serif;
  --font-size-logo: 24px;
  --font-size-nav: 16px;
  --font-size-hero: 40px;
  --font-size-title: 32px;
  --font-size-subheading: 28px;
  --font-size-body: 18px;
  --font-size-small: 14px;
  --font-size-meta: 14px;
  --font-size-btn: 18px;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;

  /* Radii */
  --radius-sharp: 4px;
  --radius-soft: 12px;
  --radius-card: 16px;
  --radius-avatar: 50%;

  /* Shadows */
  --shadow-main: 0 2px 8px var(--color-shadow);
  --shadow-card: 0 2px 6px var(--color-shadow);

  --header-height: 60px;
  --footer-height: 56px;
}

/* html, body {
  height: 100%;
} */

html {
  box-sizing: border-box;
  font-size: 100%;
}
*, *:before, *:after {
  box-sizing: inherit;
}

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-main);
  font-size: var(--font-size-body);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-heading);
  font-family: var(--font-main);
  margin-top: 0;
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-hero);
  font-weight: 800;
}
h2 {
  font-size: var(--font-size-title);
  font-weight: 700;
}
h3 {
  font-size: var(--font-size-subheading);
  font-weight: 600;
}

p {
  color: var(--color-text-main);
  font-size: var(--font-size-body);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.18s;
}
a:hover, a:focus {
  color: var(--color-btn-hover);
  text-decoration: underline;
}

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

.container {
  max-width: 640px;
  margin: 0 auto;
  padding-left: var(--space-sm);
  padding-right: var(--space-sm);
  height: 100%;
}

@media (min-width: 900px) {
  .container {
    max-width: 1040px;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }
}

/* Utility classes */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--space-lg); }
.mt-md { margin-top: var(--space-md); }
.mt-sm { margin-top: var(--space-sm); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }
.mb-sm { margin-bottom: var(--space-sm); }

.site-footer {
  height: var(--footer-height)
}

/* Button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-md);
  height: 48px;
  font-size: var(--font-size-btn);
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sharp);
  box-shadow: var(--shadow-main);
  cursor: pointer;
  transition: background 0.18s, opacity 0.18s, box-shadow 0.18s;
}
.btn span {
  display: inline-block;
  transition: transform 0.18s;
}
.btn:hover span {
  transform: translateX(4px);
}
.btn:hover, .btn:focus {
  background: var(--color-btn-hover);
  opacity: 0.85;
  outline: 2px solid var(--color-accent);
}

/* Header styles (basic, to be expanded later) */
.site-header {
  background: var(--color-bg);
  box-shadow: 0 2px 8px var(--color-shadow);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  height: var(--header-height);
  flex-shrink: 0;
  position: relative;
}

.site-logo a {
  font-size: var(--font-size-logo);
  font-weight: 800;
  color: var(--color-text-heading);
  letter-spacing: -1px;
}

/* Mobile menu toggle button */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  gap: 4px;
  transition: opacity 0.2s ease;
}

.mobile-menu-toggle:hover {
  opacity: 0.7;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background: var(--color-text-heading);
  transition: all 0.3s ease;
  transform-origin: center;
}

/* Hamburger animation when active */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.site-nav {
  overflow: hidden;
  display: flex;
  gap: var(--space-lg);
}
.site-nav a {
  color: var(--color-text-nav);
  font-size: var(--font-size-nav);
  font-weight: 500;
  position: relative;
  transition: color 0.18s;
}
.site-nav a:hover, .site-nav a:focus {
  color: var(--color-text-heading);
}
.site-nav a::after {
  content: '';
  display: block;
  height: 2px;
  width: 0;
  background: var(--color-accent);
  transition: width 0.18s;
  position: absolute;
  left: 0;
  bottom: -4px;
}
.site-nav a:hover::after, .site-nav a:focus::after {
  width: 100%;
}

/* Active page styling */
.site-nav a.active {
  color: var(--color-text-heading);
  font-weight: 600;
}

.site-nav a.active::after {
  width: 100%;
  background: var(--color-accent);
}

/* Mobile responsive header */
@media (max-width: 768px) {
  .site-header {
    padding: 0 var(--space-md);
  }

  .site-footer {
    margin-block: var(--space-sm);
  }

  .mobile-menu-toggle {
    display: flex;
  }
  
  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    box-shadow: var(--shadow-main);
    flex-direction: column;
    gap: 0;
    padding: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
    z-index: 99;
  }
  
  .site-nav.mobile-nav-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .site-nav a {
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-divider);
    font-size: var(--font-size-body);
    text-align: right;
  }
  
  .site-nav a:last-child {
    border-bottom: none;
  }
  
  .site-nav a::after {
    display: none;
  }
}

@media (max-width: 480px) {
  .site-header {
    padding: 0 var(--space-sm);
  }
  
  .site-logo a {
    font-size: 20px;
  }
  
  .site-nav {
    padding: var(--space-sm);
  }
}

/* Main content padding to avoid being hidden behind the fixed header */
/* Removed padding-top from main to avoid double spacing with hero min-height */

/* About Page Styles */
.about-banner {
  width: 100%;
  height: 100px;
}

.about-banner h1 {
  font-size: var(--font-size-title);
  font-weight: 700;
  color: var(--color-text-heading);
  margin: 0;
}

.about-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.about-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.about-left {
  display: flex;
  flex-direction: column;
}

.about-portrait {
  max-width: 300px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-main);
  margin-bottom: var(--space-md);
}

.about-section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.about-left p {
  font-size: var(--font-size-body);
  color: var(--color-text-main);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

/* Timeline Styles */
.timeline {
  position: relative;
  padding-left: 24px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-timeline);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-xl);
}

.timeline-node {
  position: absolute;
  left: -18px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  transition: all 0.2s ease-in-out;
  cursor: pointer;
  z-index: 2;
}

.timeline-node:hover {
  width: 14px;
  height: 14px;
  left: -19px;
  top: 7px;
  box-shadow: 0 0 8px var(--color-accent);
}

.timeline-card {
  background: var(--color-bg);
  padding: var(--space-sm);
  border-radius: var(--radius-sharp);
  box-shadow: var(--shadow-card);
  margin-left: var(--space-md);
}

.timeline-date {
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  font-weight: 500;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.timeline-title {
  font-size: var(--font-size-body);
  font-weight: 600;
  color: var(--color-text-heading);
}

.timeline-subtitle {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text-main);
}

.timeline-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  line-height: 1.5;
  margin-top: var(--space-xs);
}

.about-cta-link {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-heading);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease-in-out;
}

.about-cta-link:hover {
  color: var(--color-text-heading);
  transform: translateX(4px);
}

.about-cta-link:hover::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 4px;
}

/* Projects Page Styles */
.projects-filter-bar {
  position: sticky;
  top: 0;
  width: 100%;
  background: var(--color-light-gray);
  padding: var(--space-sm);
  border-radius: var(--radius-soft);
  margin-bottom: var(--space-lg);
  z-index: 90;
  box-shadow: var(--shadow-main);
}

.projects-filter-bar.sticky {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 90;
  margin: 0;
  border-radius: 0;
  box-shadow: var(--shadow-main);
}

.filter-container {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  gap: var(--space-md);
  align-items: center;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
}

.filter-select,
.filter-search {
  padding: 12px var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sharp);
  font-size: var(--font-size-small);
  background: var(--color-bg);
  transition: border-color 0.15s, box-shadow 0.15s;
  min-width: 140px;
}

.filter-select:focus,
.filter-search:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-tint);
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  right: 12px;
  color: var(--color-meta);
  pointer-events: none;
}

.filter-search {
  padding-right: 40px;
}

.sort-toggle {
  padding: 12px var(--space-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sharp);
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  cursor: pointer;
  transition: all 0.15s;
}

.sort-toggle:hover {
  background: var(--color-accent-tint);
  border-color: var(--color-accent);
}

/* Projects Grid */
.projects-container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-xl);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

/* Project Cards */
.project-card {
  background: var(--color-bg);
  border-radius: var(--radius-soft);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.project-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--color-light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-image-placeholder {
  color: var(--color-meta);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.project-content {
  padding: var(--space-sm);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.project-tag {
  padding: 4px 8px;
  background: var(--color-accent-tint);
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-soft);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-heading);
  margin: 0 0 var(--space-xs) 0;
  line-height: 1.3;
}

.project-description {
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  line-height: 1.5;
  margin: 0 0 var(--space-sm) 0;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.project-link {
  font-size: var(--font-size-small);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: all 0.15s;
}

.project-link:hover {
  color: var(--color-btn-hover);
  transform: translateX(2px);
}

.project-links {
  display: flex;
  gap: var(--space-xs);
}

.project-external-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-light-gray);
  color: var(--color-meta);
  transition: all 0.15s;
}

.project-external-link:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  transform: translateY(-1px);
}

/* No Results State */
.no-results {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  color: var(--color-meta);
}

.no-results-content svg {
  margin: 0 auto var(--space-md);
  opacity: 0.5;
}

.no-results h3 {
  font-size: 24px;
  color: var(--color-text-heading);
  margin-bottom: var(--space-sm);
}

/* Project Detail Page Styles */
.project-detail {
  margin-top: var(--header-height);
}

.project-detail-header {
  background: var(--color-light-gray);
  padding: var(--space-lg) 0;
}

.project-detail-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.project-breadcrumb {
  margin-bottom: var(--space-md);
}

.project-breadcrumb a {
  font-size: var(--font-size-small);
  color: var(--color-meta);
  text-decoration: none;
  transition: color 0.15s;
}

.project-breadcrumb a:hover {
  color: var(--color-accent);
}

.project-detail-title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  color: var(--color-text-heading);
  margin: 0 0 var(--space-md) 0;
  line-height: 1.2;
}

.project-meta {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-small);
}

.project-date,
.project-category {
  color: var(--color-meta);
  font-weight: 500;
}

.project-category {
  padding: 4px 8px;
  background: var(--color-accent-tint);
  color: var(--color-accent);
  border-radius: var(--radius-sharp);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project-detail .project-tags {
  margin-bottom: var(--space-lg);
}

.project-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.project-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 12px var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  text-decoration: none;
  border-radius: var(--radius-sharp);
  font-size: var(--font-size-small);
  font-weight: 500;
  transition: all 0.15s;
}

.project-btn:hover {
  background: var(--color-light-gray);
  border-color: var(--color-accent);
  color: var(--color-text-heading);
}

.project-btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.project-btn-primary:hover {
  background: var(--color-btn-hover);
  border-color: var(--color-btn-hover);
  color: var(--color-bg);
}

.project-detail-content {
  padding: var(--space-xl) 0;
}

.project-detail-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.project-detail-content h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.project-detail-content ul,
.project-detail-content ol {
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
}

.project-detail-content li {
  margin-bottom: var(--space-xs);
  line-height: 1.6;
}

/* Publications Page Styles */
.publications-container {
  max-width: 640px;
  margin: 0 auto 0;
  padding: var(--space-xl) var(--space-lg) var(--space-xl);
}

.publications-header {
  margin-bottom: var(--space-xl);
}

.publications-title {
  font-size: var(--font-size-subheading);
  font-weight: 600;
  color: var(--color-text-heading);
  margin: 0 0 var(--space-xs) 0;
}

.publications-underline {
  width: 40px;
  height: 2px;
  background: var(--color-accent);
  margin-top: var(--space-xs);
}

.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.publication-entry {
  margin-bottom: var(--space-lg);
}

.publication-citation {
  font-size: var(--font-size-small);
  font-style: italic;
  color: var(--color-text-main);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.publication-abstract {
  margin-bottom: var(--space-sm);
}

.abstract-snippet,
.abstract-full {
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  line-height: 1.5;
}

.show-more-btn,
.show-less-btn {
  background: none;
  border: none;
  color: var(--color-accent);
  font-size: var(--font-size-small);
  cursor: pointer;
  padding: 0;
  margin-left: var(--space-xs);
  transition: color 0.15s ease-in-out;
}

.show-more-btn:hover,
.show-less-btn:hover {
  color: var(--color-btn-hover);
  text-decoration: underline;
}

.publication-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #eee;
  color: var(--color-meta);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
}

.action-btn:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  transform: translateY(-1px);
}

/* Publication Detail Page Styles */
.publication-detail {
  margin-top: var(--header-height);
}

.publication-detail-header {
  background: var(--color-light-gray);
  padding: var(--space-lg) 0;
}

.publication-detail-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.publication-breadcrumb {
  margin-bottom: var(--space-md);
}

.publication-breadcrumb a {
  font-size: var(--font-size-small);
  color: var(--color-meta);
  text-decoration: none;
  transition: color 0.15s;
}

.publication-breadcrumb a:hover {
  color: var(--color-accent);
}

.publication-detail-title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  color: var(--color-text-heading);
  margin: 0 0 var(--space-md) 0;
  line-height: 1.2;
}

.publication-meta {
  margin-bottom: var(--space-lg);
}

.publication-authors {
  font-size: var(--font-size-body);
  color: var(--color-text-main);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.publication-venue,
.publication-type {
  font-size: var(--font-size-small);
  color: var(--color-meta);
  margin-bottom: 4px;
}

.publication-type {
  display: inline-block;
  padding: 4px 8px;
  background: var(--color-accent-tint);
  color: var(--color-accent);
  border-radius: var(--radius-sharp);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

.publication-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 12px var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  text-decoration: none;
  border-radius: var(--radius-sharp);
  font-size: var(--font-size-small);
  font-weight: 500;
  transition: all 0.15s;
}

.publication-btn:hover {
  background: var(--color-light-gray);
  border-color: var(--color-accent);
  color: var(--color-text-heading);
}

.publication-btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.publication-btn-primary:hover {
  background: var(--color-btn-hover);
  border-color: var(--color-btn-hover);
  color: var(--color-bg);
}

.publication-detail-content {
  padding: var(--space-xl) 0;
}

.publication-citation-box {
  background: var(--color-light-gray);
  padding: var(--space-md);
  border-radius: var(--radius-soft);
  margin-bottom: var(--space-lg);
}

.publication-citation-box h3 {
  font-size: var(--font-size-body);
  font-weight: 600;
  color: var(--color-text-heading);
  margin: 0 0 var(--space-sm) 0;
}

.citation-text {
  font-size: var(--font-size-small);
  font-style: italic;
  color: var(--color-text-main);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.copy-citation-btn {
  background: var(--color-accent);
  color: var(--color-bg);
  border: none;
  padding: 8px var(--space-sm);
  border-radius: var(--radius-sharp);
  font-size: var(--font-size-small);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-citation-btn:hover {
  background: var(--color-btn-hover);
}

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

.publication-abstract-section h3 {
  font-size: var(--font-size-body);
  font-weight: 600;
  color: var(--color-text-heading);
  margin: 0 0 var(--space-sm) 0;
}

.publication-abstract-section p {
  font-size: var(--font-size-body);
  color: var(--color-text-main);
  line-height: 1.6;
}

.footer-content {
  display: flex;
  flex-direction: row;
  justify-content: center;
  gap: var(--space-sm);
  color: var(--color-meta);
  font-size: var(--font-size-small);
}

/* Responsive adjustments for projects */
@media (max-width: 900px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-sm);
  }
  
  .projects-container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }
  
  .filter-container {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }
  
  .filter-group {
    justify-content: stretch;
  }
  
  .filter-select,
  .filter-search,
  .sort-toggle {
    width: 100%;
  }
  
  .project-detail-container {
    padding: 0 var(--space-md);
  }
  
  .project-detail-title {
    font-size: 28px;
  }
  
  .about-columns {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

@media (max-width: 600px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .projects-container {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }
  
  .project-detail-container {
    padding: 0 var(--space-sm);
  }
  
  .project-links {
    flex-direction: column;
  }
  
  .project-btn {
    justify-content: center;
  }
}

/* Responsive adjustments for publications */
@media (max-width: 900px) {
  .publications-container,
  .publication-detail-container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .publications-container{
    margin: 0;
  }
  
  .publication-detail-title {
    font-size: 28px;
  }
  
  .publication-btn {
    justify-content: center;
  }
}

@media (max-width: 600px) {
  .about-banner {
    height: 30px;
  }
  .about-portrait {
    max-width: 200px;
  }
  .publications-container,
  .publication-detail-container {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }
}

/* Fullscreen page layout: no scroll, main fills remaining space */
.fullscreen-page {
  height: 100dvh;
  min-height: 100dvh;
  overflow: hidden;
}
.fullscreen-page main {
  overflow: hidden;
  min-height: 0;
  flex: 1 1 auto; /* Allow main to grow and fill available space */
}
.fullscreen-page html, .fullscreen-page body {
  overflow: hidden;
}

/* Non-fullscreen: main scrolls if needed */
body:not(.fullscreen-page) main {
  min-height: calc(100dvh - var(--footer-height) - var(--header-height));
}

main {
  height: 100%;
}