/* ===================================
   CSS Variables
   =================================== */
:root {
  /* Trust & Authority Color Palette */
  --color-primary: #1a365d;
  --color-secondary: #0891b2;
  --color-dark: #0f172a;
  --color-light: #f8fafc;
  --color-success: #059669;
  --color-warning: #ea580c;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;

  /* Typography */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

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

  /* Mobile-specific spacing overrides (applied via media queries) */
  --spacing-mobile-xs: 0.4rem;
  --spacing-mobile-sm: 0.75rem;
  --spacing-mobile-md: 1rem;
  --spacing-mobile-lg: 1.5rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Container */
  --container-max-width: 1200px;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-sm);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

code {
  font-family: var(--font-mono);
  background-color: var(--color-gray-100);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

pre {
  background-color: var(--color-dark);
  color: var(--color-light);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

pre code {
  background-color: transparent;
  padding: 0;
  color: inherit;
}

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

.main-content {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-xl) 0;
}

/* ===================================
   Header
   =================================== */
.site-header {
  background: var(--color-light);
  border-bottom: 2px solid var(--color-primary);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-link {
  display: block;
  line-height: 0;
}

.site-logo {
  width: 48px;
  height: 48px;
  transition: transform var(--transition-base);
}

.site-logo:hover {
  transform: scale(1.05);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name-link {
  text-decoration: none;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
  transition: color var(--transition-base);
}

.brand-name-link:hover .brand-name {
  color: var(--color-secondary);
}

.brand-tagline {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  margin: 0;
}

/* Navigation Wrapper */
.nav-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-link {
  color: var(--color-dark);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-gray-100);
}

/* Mobile Menu Toggle - Hidden on desktop */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  z-index: 101;
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-dark);
  transition: all var(--transition-base);
}

.search-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-dark);
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.search-toggle:hover {
  background-color: var(--color-gray-100);
  color: var(--color-primary);
}

/* Mobile Navigation - Expanding Menu */
@media (max-width: 768px) {
  /* Show hamburger menu toggle */
  .mobile-menu-toggle {
    display: flex;
  }

  /* Hamburger to X animation */
  .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, -7px);
  }

  /* Make header wrap for mobile */
  .header-inner {
    flex-wrap: wrap;
  }

  /* Nav wrapper takes full width on mobile */
  .nav-wrapper {
    order: 3;
    width: 100%;
  }

  /* Main navigation - hidden by default, expands when active */
  .main-nav {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    transition: max-height 0.3s ease;
  }

  .main-nav.active {
    max-height: 500px;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-200);
  }

  /* Vertical navigation list on mobile */
  .nav-list {
    flex-direction: column;
    width: 100%;
    gap: 0;
    align-items: stretch;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    border-radius: 0;
    text-align: left;
  }

  /* Search toggle in mobile menu */
  .search-toggle {
    width: 100%;
    justify-content: flex-start;
    padding: var(--spacing-md);
    border-radius: 0;
    border-top: 1px solid var(--color-gray-200);
    margin-top: var(--spacing-xs);
  }

  .search-toggle svg {
    margin-right: var(--spacing-xs);
  }

  /* Hide brand tagline on mobile */
  .brand-text {
    display: none;
  }
}

/* ===================================
   Footer
   =================================== */
.site-footer {
  background-color: var(--color-dark);
  color: var(--color-light);
  padding: var(--spacing-2xl) 0 var(--spacing-md);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.footer-logo {
  width: 32px;
  height: 32px;
  filter: brightness(0) invert(1);
}

.footer-brand h3 {
  color: var(--color-light);
  margin: 0;
}

.footer-description {
  color: var(--color-gray-300);
  font-size: 0.9rem;
}

.footer-heading {
  color: var(--color-light);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: var(--color-gray-300);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-secondary);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.copyright,
.powered-by {
  color: var(--color-gray-400);
  font-size: 0.875rem;
}

.powered-by a {
  color: var(--color-gray-300);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  text-align: center;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-secondary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: white;
}

/* ===================================
   Homepage
   =================================== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  color: white;
}

.hero-tagline {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  opacity: 0.95;
}

.hero-description {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  opacity: 0.9;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.section {
  margin-bottom: var(--spacing-2xl);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  margin: 0;
}

.view-all {
  color: var(--color-secondary);
  font-weight: 600;
  transition: all var(--transition-base);
}

.view-all:hover {
  transform: translateX(4px);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.post-card {
  background-color: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.post-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-secondary);
}

.post-meta {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-sm);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  align-items: center;
}

.separator {
  color: var(--color-gray-400);
}

.category {
  color: var(--color-secondary);
  font-weight: 600;
}

.post-title {
  margin-bottom: var(--spacing-sm);
}

.post-title a {
  color: var(--color-dark);
  transition: color var(--transition-base);
}

.post-title a:hover {
  color: var(--color-primary);
}

.post-description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-md);
}

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

.tag {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: all var(--transition-base);
}

.tag:hover {
  background-color: var(--color-primary);
  color: white;
}

.read-more {
  color: var(--color-secondary);
  font-weight: 600;
  transition: all var(--transition-base);
  display: inline-block;
}

.read-more:hover {
  transform: translateX(4px);
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background-color: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  position: relative;
  transition: all var(--transition-base);
}

.project-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-secondary);
}

.featured-badge {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background-color: var(--color-warning);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.project-title {
  margin-bottom: var(--spacing-sm);
}

.project-title a {
  color: var(--color-dark);
  transition: color var(--transition-base);
}

.project-title a:hover {
  color: var(--color-primary);
}

.project-description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-md);
}

.technologies {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.tech-tag {
  background-color: var(--color-secondary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
}

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

.project-link {
  color: var(--color-secondary);
  font-weight: 600;
  transition: all var(--transition-base);
}

.project-link:hover {
  transform: translateX(4px);
}

.about-preview {
  background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  text-align: center;
}

.about-preview h2 {
  margin-bottom: var(--spacing-md);
}

.about-preview p {
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  color: var(--color-gray-700);
  font-size: 1.125rem;
}

/* ===================================
   Blog Pages
   =================================== */
.page-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--color-gray-200);
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-gray-600);
  max-width: 700px;
  margin: 0 auto;
}

.posts-list {
  max-width: 800px;
  margin: 0 auto;
}

.post-item {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

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

.post-excerpt {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-md);
}

/* Single Post */
.post-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.post-content-wrapper {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.table-of-contents {
  background-color: var(--color-gray-100);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  position: sticky;
  top: 100px;
  max-height: 80vh;
  overflow-y: auto;
}

.table-of-contents h2 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
}

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

.table-of-contents a {
  color: var(--color-gray-700);
  font-size: 0.9rem;
}

.post-content {
  line-height: 1.8;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.post-content ul,
.post-content ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

.post-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--color-gray-600);
}

.post-footer {
  max-width: 800px;
  margin: var(--spacing-2xl) auto 0;
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--color-gray-200);
}

.share-buttons {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.share-buttons h3 {
  margin-bottom: var(--spacing-md);
}

.share-button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  margin: 0 var(--spacing-xs);
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-base);
}

.share-button:hover {
  background-color: var(--color-secondary);
  transform: translateY(-2px);
}

.post-navigation {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.nav-link {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  background-color: var(--color-gray-100);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav-link:hover {
  background-color: var(--color-gray-200);
  transform: translateY(-2px);
}

.nav-label {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-xs);
}

.nav-title {
  font-weight: 600;
  color: var(--color-dark);
}

/* ===================================
   Projects Pages
   =================================== */
.projects-grid-page {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: var(--spacing-xl);
}

.project-card-detailed {
  background-color: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  position: relative;
  transition: all var(--transition-base);
}

.project-card-detailed:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.project-header {
  margin-bottom: var(--spacing-lg);
}

.project-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.technologies-section {
  margin-bottom: var(--spacing-lg);
}

.technologies-section h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
}

.project-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

.project-content ul,
.project-content ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

.project-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.project-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--color-gray-600);
}

.project-navigation {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.back-to-projects {
  text-align: center;
}

/* ===================================
   Default Page Content
   =================================== */
.page-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

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

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

.page-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.page-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--color-gray-600);
}

/* ===================================
   Filters & Taxonomy
   =================================== */
.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--color-gray-100);
  border-radius: var(--radius-lg);
}

.filter-group h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
}

.filter-list {
  list-style: none;
}

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

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag-cloud-page {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  padding: var(--spacing-xl) 0;
}

.tag-cloud-item {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-base);
}

.tag-cloud-item:hover {
  background-color: var(--color-primary);
  color: white;
  transform: scale(1.05);
}

.tag-count {
  color: var(--color-gray-500);
  font-size: 0.875rem;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.category-card {
  background-color: white;
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.category-card:hover {
  border-color: var(--color-secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.category-card h2 {
  margin-bottom: var(--spacing-xs);
}

.category-count {
  color: var(--color-gray-600);
  font-size: 0.9rem;
}

/* ===================================
   Pagination
   =================================== */
.pagination {
  margin-top: var(--spacing-2xl);
  text-align: center;
}

.pagination-list {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  list-style: none;
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.pagination-link {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: white;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  color: var(--color-dark);
  transition: all var(--transition-base);
  min-width: 40px;
  text-align: center;
}

.pagination-link:hover,
.pagination-link.active {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.pagination-info {
  color: var(--color-gray-600);
  font-size: 0.875rem;
}

/* ===================================
   Search Modal
   =================================== */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.search-modal.active {
  opacity: 1;
  visibility: visible;
}

.search-modal-content {
  background-color: white;
  border-radius: var(--radius-lg);
  max-width: 700px;
  width: 90%;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
}

.search-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-gray-200);
}

.search-modal-header h2 {
  margin: 0;
}

.search-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-gray-600);
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.search-close:hover {
  background-color: var(--color-gray-100);
  color: var(--color-dark);
}

.search-modal-body {
  padding: var(--spacing-md);
}

.search-modal-input {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  transition: border-color var(--transition-base);
}

.search-modal-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.search-modal-results {
  max-height: 50vh;
  overflow-y: auto;
}

.search-hint {
  text-align: center;
  color: var(--color-gray-500);
  padding: var(--spacing-lg);
}

.search-result-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-gray-200);
  transition: background-color var(--transition-base);
}

.search-result-item:hover {
  background-color: var(--color-gray-100);
}

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

.search-result-item h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.search-result-item p {
  color: var(--color-gray-600);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
}

.search-result-meta {
  display: flex;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

.search-result-section {
  text-transform: capitalize;
  font-weight: 600;
  color: var(--color-secondary);
}

/* ===================================
   Responsive Design
   =================================== */

/* Small Phones: 320px - 480px */
@media (max-width: 480px) {
  body {
    font-size: 15px;
    line-height: 1.65;
  }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  h4 { font-size: 1.125rem; }

  /* Container adjustments */
  .container {
    padding: 0 var(--spacing-sm);
  }

  /* Main content spacing */
  .main-content {
    padding: var(--spacing-md) 0;
  }

  /* Hero section */
  .hero {
    padding: var(--spacing-lg) 0;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-tagline {
    font-size: 1.1rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  /* Cards padding reduction */
  .post-card,
  .project-card,
  .project-card-detailed {
    padding: var(--spacing-md);
  }

  /* Logo size */
  .site-logo {
    width: 40px;
    height: 40px;
  }

  /* Touch targets */
  .nav-link {
    padding: var(--spacing-md) var(--spacing-sm);
    min-height: 44px;
  }

  .search-toggle {
    padding: 12px;
  }

  .pagination-link {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .tag {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }

  .search-close {
    padding: 12px;
  }

  /* Search modal - full screen on small phones */
  .search-modal {
    padding-top: 0;
  }

  .search-modal-content {
    width: 100%;
    height: 100%;
    max-height: 100vh;
    border-radius: 0;
  }

  .search-modal-input {
    font-size: 16px;
    min-height: 44px;
  }

  /* Code blocks with scroll indicator */
  pre {
    position: relative;
  }

  pre::after {
    content: '→';
    position: absolute;
    right: 10px;
    top: 10px;
    opacity: 0.5;
    font-size: 1.2rem;
  }

  /* Footer links */
  .footer-links a {
    display: block;
    padding: 8px 16px;
    min-height: 44px;
  }
}

/* Standard Phones: 481px - 640px */
@media (min-width: 481px) and (max-width: 640px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-tagline {
    font-size: 1.25rem;
  }

  .search-modal {
    padding-top: 2vh;
  }

  .search-modal-content {
    width: 95%;
    max-height: 90vh;
  }
}

/* Tablets: 641px - 768px */
@media (min-width: 641px) and (max-width: 768px) {
  .search-modal {
    padding-top: 5vh;
  }

  .search-modal-content {
    width: 90%;
    max-height: 85vh;
  }
}

/* Mobile & Tablets: Up to 768px */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }

  /* Hero section */
  .hero-title {
    font-size: 2rem;
  }

  .hero-tagline {
    font-size: 1.25rem;
  }

  /* Grid layouts - single column */
  .posts-grid,
  .projects-grid,
  .projects-grid-page {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-lg);
  }

  .footer-links {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .footer-links li {
    margin-bottom: 12px;
  }

  /* Filters */
  .filters {
    grid-template-columns: 1fr;
  }

  .categories-grid {
    grid-template-columns: 1fr;
  }

  /* Main content spacing */
  .main-content {
    padding: var(--spacing-lg) 0;
  }

  /* Card padding */
  .post-card,
  .project-card,
  .project-card-detailed {
    padding: var(--spacing-md);
  }

  /* Touch targets for all interactive elements */
  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .search-toggle {
    padding: 12px;
  }

  .pagination-link {
    min-width: 44px;
    min-height: 44px;
  }

  .tag {
    padding: 0.5rem 1rem;
  }

  .search-close {
    padding: 12px;
  }

  /* Table of Contents - collapsible on mobile */
  .table-of-contents {
    position: static;
    margin-bottom: var(--spacing-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 var(--spacing-md);
  }

  .table-of-contents.expanded {
    max-height: 500px;
    padding: var(--spacing-md);
  }

  .table-of-contents h2 {
    cursor: pointer;
    user-select: none;
    padding: var(--spacing-md);
    margin: 0;
    background-color: var(--color-gray-200);
    border-radius: var(--radius-md);
    position: relative;
  }

  .table-of-contents h2::after {
    content: ' ▼';
    font-size: 0.8em;
    position: absolute;
    right: var(--spacing-md);
    transition: transform var(--transition-base);
  }

  .table-of-contents.expanded h2::after {
    transform: rotate(180deg);
  }
}

/* Large Tablets: 769px - 1023px */
@media (min-width: 769px) and (max-width: 1023px) {
  .posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Table of Contents - still collapsible on large tablets */
  .table-of-contents {
    position: static;
    margin-bottom: var(--spacing-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 var(--spacing-md);
  }

  .table-of-contents.expanded {
    max-height: 500px;
    padding: var(--spacing-md);
  }

  .table-of-contents h2 {
    cursor: pointer;
    user-select: none;
    padding: var(--spacing-md);
    margin: 0;
    background-color: var(--color-gray-200);
    border-radius: var(--radius-md);
    position: relative;
  }

  .table-of-contents h2::after {
    content: ' ▼';
    font-size: 0.8em;
    position: absolute;
    right: var(--spacing-md);
    transition: transform var(--transition-base);
  }

  .table-of-contents.expanded h2::after {
    transform: rotate(180deg);
  }
}

/* Desktop: 1024px and up */
@media (min-width: 1024px) {
  .post-content-wrapper {
    grid-template-columns: 200px 1fr;
  }

  /* Table of Contents always visible on desktop */
  .table-of-contents {
    max-height: none !important;
    padding: var(--spacing-md) !important;
  }

  .table-of-contents h2 {
    cursor: default !important;
  }

  .table-of-contents h2::after {
    display: none !important;
  }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

/* ===================================
   Accessibility - Reduced Motion
   =================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}