/* ============================================
   Design System - Refined with Dark Mode
   Apple-level restraint + subtle texture + documentation clarity
   ============================================ */

:root {
  /* Light Mode Colors - Warm & Refined */
  --color-bg: #fefefe;
  --color-text: #1a1a1a;
  --color-text-muted: #4a4a4a;
  --color-text-light: #6a6a6a;
  --color-border: #e5e5e5;
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --color-code-bg: #f8f8f8;
  --color-shadow: rgba(0, 0, 0, 0.08);

  /* Typography - Apple-inspired */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Consolas', monospace;

  --font-size-base: 1.0625rem;
  /* 17px */
  --line-height-base: 1.7;
  --line-height-heading: 1.25;
  --letter-spacing-heading: -0.02em;

  /* Spacing - 8px base unit */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Container */
  --container-width: 800px;
  --container-padding: 2rem;

  /* Transitions - Custom easing */
  --transition-fast: 150ms cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0.0, 0.2, 1);

  /* Texture */
  --texture-opacity: 0.3;
}

/* Dark Mode Colors */
[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-text: #e8e8e8;
  --color-text-muted: #a0a0a0;
  --color-text-light: #8a8a8a;
  --color-border: #333333;
  --color-accent: #4a9eff;
  --color-accent-hover: #6bb0ff;
  --color-code-bg: #252525;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --texture-opacity: 0.15;
}

/* ============================================
   Theme Transition - Organic Ink Effect
   ============================================ */

.theme-transitioning,
.theme-transitioning * {
  transition: background-color 800ms cubic-bezier(0.4, 0.0, 0.2, 1),
    color 800ms cubic-bezier(0.4, 0.0, 0.2, 1),
    border-color 800ms cubic-bezier(0.4, 0.0, 0.2, 1) !important;
}

/* Skip transitions for initial load */
.no-transition,
.no-transition * {
  transition: none !important;
}

/* ============================================
   Base Styles
   ============================================ */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-weight: 400;
  transition: background-color var(--transition-base), color var(--transition-base);

  /* Subtle background texture */
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('/images/3629.jpg');
  background-repeat: repeat;
  background-size: 400px; /* Increased size for the pattern */
  opacity: var(--texture-opacity);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] body::before {
    filter: invert(1);
}

/* ============================================
   Layout Components
   ============================================ */

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
  z-index: 1;
}

/* ============================================
   Header & Navigation - Refined
   ============================================ */

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  background-color: var(--color-bg);
  z-index: 100;
  backdrop-filter: blur(12px) saturate(180%);
  background-color: rgba(254, 254, 254, 0.92);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

[data-theme="dark"] .site-header {
  background-color: rgba(26, 26, 26, 0.92);
}

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

.nav-brand .site-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
  letter-spacing: -0.01em;
}

.nav-brand .site-title:hover {
  color: var(--color-accent);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  flex: 1;
  justify-content: center;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  letter-spacing: -0.005em;
  white-space: nowrap;
}

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

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.nav-external {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), transform var(--transition-fast);
  border-radius: 6px;
  position: relative;
}

.theme-toggle:hover {
  color: var(--color-text);
  background-color: var(--color-code-bg);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle svg {
  position: absolute;
  opacity: 0;
  transform: scale(0.8) rotate(-30deg);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.theme-toggle svg.visible {
  opacity: 1;
  transform: scale(1) rotate(0deg);
  position: relative;
}

.nav-external .github-link {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  padding: 0.375rem;
  border-radius: 6px;
}

.nav-external .github-link:hover {
  color: var(--color-text);
  background-color: var(--color-code-bg);
}

/* ============================================
   Homepage / Hero - With Photo
   ============================================ */

.hero {
  padding: var(--space-3xl) 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.hero-photo {
  width: 120px;
  height: 120px;
  border-radius: 24px; /* More rounded */
  overflow: hidden;
  box-shadow:
    0 2px 8px var(--color-shadow),
    0 8px 24px var(--color-shadow);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.hero-photo:hover {
  transform: translateY(-2px);
  box-shadow:
    0 4px 12px var(--color-shadow),
    0 12px 32px var(--color-shadow);
}

.hero-photo img,
.hero-photo svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Placeholder monogram styling */
.hero-photo svg {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-heading);
}

.hero-subtitle {
  font-size: 1.3125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
  line-height: 1.5;
  font-weight: 400;
}

.hero-secondary {
  font-size: 1.125rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============================================
   Page Content
   ============================================ */

.page {
  padding: var(--space-2xl) 0;
  min-height: 70vh;
}

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

.page-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-heading);
}

/* ============================================
   Prose / Content Styling - Enhanced
   ============================================ */

.prose {
  max-width: 100%;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  font-weight: 600;
  line-height: var(--line-height-heading);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-heading);
}

.prose h1 {
  font-size: 2.25rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-sm);
  font-weight: 700;
}

.prose h2 {
  font-size: 1.75rem;
  margin-top: var(--space-2xl);
  font-weight: 600;
}

.prose h3 {
  font-size: 1.375rem;
  font-weight: 600;
}

.prose h4 {
  font-size: 1.125rem;
  font-weight: 600;
}

.prose p {
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.prose a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
  background-image: linear-gradient(to right, var(--color-accent) 0%, var(--color-accent) 100%);
  background-size: 0% 1px;
  background-position: 0% 100%;
  background-repeat: no-repeat;
  transition: background-size var(--transition-base), color var(--transition-fast);
}

.prose a:hover {
  color: var(--color-accent-hover);
  background-size: 100% 1px;
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.prose li {
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

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

.prose code {
  background-color: var(--color-code-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: var(--font-family-mono);
  color: var(--color-text);
  transition: background-color var(--transition-base);
}

.prose pre {
  background-color: var(--color-code-bg);
  padding: var(--space-md);
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.prose pre code {
  background-color: transparent;
  padding: 0;
  font-size: 0.875rem;
  border: none;
}

.prose strong {
  font-weight: 600;
  color: var(--color-text);
}

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

/* ============================================
   Footer
   ============================================ */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-3xl);
  transition: border-color var(--transition-base);
}

.footer-text {
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* ============================================
   Animations - Refined
   ============================================ */

.fade-in {
  animation: fadeIn 600ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-view {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-view.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Focus States - Accessibility
   ============================================ */

*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ============================================
   Reduced Motion Support
   ============================================ */

@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;
  }
}

/* ============================================
   Post Lists (Cards)
   ============================================ */

.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-bg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  text-decoration: none;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-shadow);
  border-color: var(--color-accent);
}

.post-card-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
  letter-spacing: -0.01em;
  transition: color var(--transition-fast);
}

.post-card:hover .post-card-title {
  color: var(--color-accent);
}

.post-card-meta {
  font-size: 0.875rem;
  color: var(--color-text-light);
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.post-card-summary {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-2xl);
  list-style: none;
}

.pagination-link {
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

/* Footer Enhanced */
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-nav {
    display: flex;
    gap: var(--space-md);
    list-style: none;
    padding: 0;
}

.footer-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.875rem;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-sm);
  margin-top: var(--space-2xl);
}

/* ============================================
   Project Grid & Cards
   ============================================ */

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.project-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px var(--color-shadow);
    border-color: var(--color-accent);
}

.project-card-image {
    aspect-ratio: 1/1;
    width: 100%;
    position: relative;
    overflow: hidden;
    background-color: var(--color-code-bg);
    border-bottom: 1px solid var(--color-border);
}

.project-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-card-image img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: opacity var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(2px);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-action-btn {
    width: 48px;
    height: 48px;
    background-color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1a1a1a;
    transition: transform var(--transition-fast);
}

.project-action-btn:hover {
    transform: scale(1.1);
    color: var(--color-accent);
}

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

.project-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    line-height: 1.4;
}

.project-title a {
    color: var(--color-text);
    text-decoration: none;
    background: none; /* Remove prose underline */
}

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

.project-summary {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.project-tag {
    font-size: 0.75rem;
    padding: 2px 8px;
    background-color: var(--color-code-bg);
    color: var(--color-text-light);
    border-radius: 4px;
    font-family: var(--font-family-mono);
}

/* ============================================
   Responsive Design - Enhanced Mobile
   ============================================ */

@media (max-width: 768px) {
  :root {
    --container-padding: 1.25rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --font-size-base: 1rem;
  }

  /* Sticky Header for Mobile */
  .site-header {
    padding: var(--space-sm) 0;
  }

  .nav {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .nav-brand .site-title {
    font-size: 1.25rem;
  }

  .nav-menu {
    width: 100%;
    overflow-x: auto;
    padding: var(--space-xs) 0;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
    gap: var(--space-sm);
  }

  .nav-menu::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
  }

  .nav-item {
    flex-shrink: 0;
  }

  .nav-link {
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
  }

  .nav-link.active::after {
    bottom: -0.25rem;
  }

  .nav-external {
    position: absolute;
    top: var(--space-sm);
    right: var(--container-padding);
    gap: var(--space-xs);
  }

  /* Hero Section Mobile */
  .hero {
    padding: var(--space-xl) 0;
    min-height: auto;
    text-align: center;
  }

  .hero-content {
    align-items: center;
    max-width: 100%;
  }

  .hero-photo {
    width: 100px;
    height: 100px;
  }

  .hero-title {
    font-size: 2.25rem;
    line-height: 1.1;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

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

  /* Page Headers */
  .page {
    padding: var(--space-xl) 0;
  }

  .page-title {
    font-size: 2rem;
    text-align: center;
  }

  /* Grid Layouts Mobile */
  .project-grid {
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: var(--space-md);
  }

  /* Overlay Always Visible or Different on Touch */
  .project-overlay {
    opacity: 1;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 50%);
    align-items: flex-end;
    justify-content: flex-end;
    padding: var(--space-sm);
  }

  .project-action-btn {
    width: 40px;
    height: 40px;
  }

  /* Footer Mobile */
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-md);
  }

  .footer-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.875rem;
  }

  .section-title {
    font-size: 1.25rem;
  }

  .prose h1 {
    font-size: 1.75rem;
  }

  .prose h2 {
    font-size: 1.375rem;
  }
}

/* ============================================
   Typography Overrides
   ============================================ */

/* Signature Font for Brand Name */
.site-title,
.hero-title {
    font-family: 'Great Vibes', cursive;
    font-weight: 400; /* Script fonts usually don't need bold */
}

.site-title {
    font-size: 1.75rem; /* Increased from 1.125rem for legibility */
}

.hero-title {
    font-size: 4.5rem; /* Increased from 3.5rem */
    letter-spacing: 0; /* Script fonts shouldn't have tight tracking */
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }
}