/* Google Fonts Import with all weights and subsets */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&display=swap');

/* Fallback system fonts for all platforms */
@font-face {
  font-family: 'System Fallback';
  src: local(-apple-system), local(BlinkMacSystemFont), local('Segoe UI'), 
       local(Roboto), local('Helvetica Neue'), local(Arial), local(sans-serif);
  font-display: swap;
}

:root {
  /* Modern color palette - Light theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-soft: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #8b5cf6, #6366f1);
  --accent-soft: #ede9fe;
  --border: #e2e8f0;
  --border-soft: #e9eef2;
  --card-bg: #ffffff;
  --code-bg: #f1f5f9;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  
  /* Tag colors - Light theme */
  --tag-bg: #f1f5f9;
  --tag-text: #334155;
  --tag-hover: #e2e8f0;
  --tag-accent: #8b5cf6;

  /* Viewport settings for all devices */
  --viewport-height: 100vh;
  --viewport-height-fallback: 100vh;
  --safe-area-inset-top: env(safe-area-inset-top);
  --safe-area-inset-bottom: env(safe-area-inset-bottom);
  --safe-area-inset-left: env(safe-area-inset-left);
  --safe-area-inset-right: env(safe-area-inset-right);
}

@supports (height: 100dvh) {
  :root {
    --viewport-height: 100dvh;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Modern dark theme - Deep and sophisticated */
    --bg-primary: #0b1120;
    --bg-secondary: #111827;
    --bg-soft: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #a78bfa, #818cf8);
    --accent-soft: #1e1b4b;
    --border: #1e293b;
    --border-soft: #334155;
    --card-bg: #111827;
    --code-bg: #1e293b;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
    
    /* Tag colors - Dark theme */
    --tag-bg: #1e293b;
    --tag-text: #cbd5e1;
    --tag-hover: #334155;
    --tag-accent: #a78bfa;
  }
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent; /* Removes tap highlight on mobile */
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%; /* Prevents font scaling on landscape mobile */
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', 'System Fallback', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01', 'ss02', 'cv01', 'cv02';
  min-height: var(--viewport-height);
  min-height: var(--viewport-height-fallback);
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  text-wrap: balance; /* Better heading wrapping on all devices */
}

p {
  text-wrap: pretty; /* Better paragraph wrapping */
}

/* Layout */
.page {
  min-height: var(--viewport-height);
  min-height: var(--viewport-height-fallback);
  display: flex;
  flex-direction: column;
  width: 100%;
  overflow-x: hidden;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

/* Modern Header */
.site-header {
  padding: 2rem 0;
  padding-top: calc(2rem + var(--safe-area-inset-top));
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px); /* Safari support */
  background-color: rgba(var(--bg-primary), 0.8);
  z-index: 100;
  width: 100%;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  letter-spacing: -0.03em;
}

/* Modern Navigation */
.nav {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 0.25rem;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

.nav a:hover::after,
.nav a.active::after {
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 4rem 0 3rem;
}

.hero-text {
  font-size: 1.5rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.5;
  font-weight: 400;
}

/* Modern Post Cards */
.posts-list {
  margin: 3rem 0 5rem;
}

.post-card {
  margin-bottom: 4rem;
  padding: 2rem;
  background-color: var(--card-bg);
  border-radius: 24px;
  border: 1px solid var(--border-soft);
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

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

.post-date {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  background: var(--bg-soft);
  padding: 0.25rem 1rem;
  border-radius: 30px;
}

.post-title {
  margin-bottom: 1rem;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
}

.post-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.post-title a:hover {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.post-excerpt {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

/* Beautiful Modern Tags */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--tag-text);
  background-color: var(--tag-bg);
  border-radius: 30px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  border: 1px solid transparent;
  text-transform: uppercase;
}

.tag:hover {
  background-color: var(--tag-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  border-color: var(--tag-accent);
}

/* Article Page */
.article-header {
  margin: 2rem 0 3rem;
}

.article-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-meta {
  display: flex;
  gap: 2rem;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

/* Modern Table of Contents */
.table-of-contents {
  background: var(--bg-secondary);
  border-radius: 24px;
  padding: 2rem;
  margin: 2.5rem 0 3rem;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-md);
}

.table-of-contents h1 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toc-list {
  list-style: none;
  margin: 0 !important;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.toc-list a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: 12px;
  transition: all 0.2s ease;
  border-left: 2px solid transparent;
}

.toc-list a:hover {
  color: var(--accent);
  background-color: var(--bg-soft);
  border-left-color: var(--accent);
  padding-left: 1.5rem;
}

/* Article Content Styling */
.article-content {
  font-size: 1.125rem;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 1.8rem;
}

.article-content h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 3rem 0 1.5rem;
  letter-spacing: -0.02em;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-soft);
}

.article-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
}

.article-content blockquote {
  margin: 2.5rem 0;
  padding: 2rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-soft) 100%);
  border-radius: 24px;
  font-style: italic;
  color: var(--text-secondary);
  position: relative;
}

.article-content blockquote::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: 20px;
  font-size: 6rem;
  color: var(--accent);
  opacity: 0.3;
  font-family: serif;
}

/* Modern Lists */
.social-media-list {
  list-style: none;
  margin: 2rem 0 !important;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.social-media-list a {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-soft) 100%);
  border-radius: 40px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  border: 1px solid var(--border-soft);
  transition: all 0.3s ease;
  gap: 0.5rem;
}

.social-media-list a:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
  color: var(--accent);
}

/* Skills List Modern */
.skills-list {
  list-style: none;
  margin: 2rem 0 !important;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skills-list li {
  padding: 0.5rem 1.25rem;
  background: linear-gradient(135deg, var(--accent) 0%, var(--tag-accent) 100%);
  border-radius: 30px;
  font-size: 0.9rem;
  color: white;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

.skills-list li:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

/* Comments Section */
.comments-container {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 2px solid var(--border-soft);
}

.comments-container h3 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

.comments-fallback {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-soft) 100%);
  padding: 3rem;
  border-radius: 24px;
  text-align: center;
  border: 1px solid var(--border-soft);
}

/* About Page Specific */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.philosophy-item {
  padding: 2rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-soft) 100%);
  border-radius: 24px;
  border: 1px solid var(--border-soft);
  transition: all 0.3s ease;
}

.philosophy-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

/* Contact Note */
.contact-note {
  margin: 3rem 0 2rem;
  padding: 3rem;
  background: var(--accent-gradient);
  border-radius: 30px;
  color: white;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

/* Footer */
.site-footer {
  margin-top: auto;
  padding: 3rem 0;
  padding-bottom: calc(3rem + var(--safe-area-inset-bottom));
  border-top: 1px solid var(--border-soft);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, transparent 100%);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Index page moving message */
.moving-message {
  text-align: center;
  padding: 4rem 0;
  margin: 2rem 0;
  background: var(--bg-secondary);
  border-radius: 24px;
}

.moving-title {
  font-size: clamp(2rem, 8vw, 3rem);
  margin-bottom: 1rem;
}

.moving-subtitle {
  font-size: clamp(1.2rem, 5vw, 1.5rem);
  margin-bottom: 2rem;
  color: var(--text-secondary);
}

.new-domain {
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: bold;
  margin: 2rem 0;
  padding: 1rem;
  background: var(--accent-soft);
  border-radius: 60px;
}

.new-domain a {
  color: var(--accent);
  text-decoration: none;
  word-break: break-word;
}

.moving-button {
  display: inline-block;
  padding: 1rem 3rem;
  background: var(--accent-gradient);
  color: white;
  text-decoration: none;
  border-radius: 40px;
  font-weight: 600;
  margin: 1rem 0;
  transition: transform 0.3s ease;
}

.moving-button:hover {
  transform: scale(1.05);
}

.moving-note {
  margin-top: 3rem;
  color: var(--text-muted);
}

/* Enhanced Mobile Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }

  .article-title {
    font-size: 2.25rem;
  }

  .post-card {
    padding: 1.5rem;
  }

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

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

  .table-of-contents {
    padding: 1.5rem;
  }

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

  .social-media-list a {
    width: 100%;
    justify-content: center;
  }

  /* Improved touch targets on mobile */
  .nav a,
  .tag,
  .tag-filter,
  .social-media-list a {
    padding: 0.6rem 1.2rem;
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .article-title {
    font-size: 1.75rem;
  }

  .article-meta {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }

  .nav {
    gap: 0.75rem;
    width: 100%;
    justify-content: center;
  }

  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .site-title {
    margin-bottom: 0.5rem;
  }

  /* Better readability on very small screens */
  .post-excerpt {
    font-size: 1rem;
  }

  .post-date {
    font-size: 0.8rem;
  }

  .tag {
    font-size: 0.7rem;
    padding: 0.35rem 0.9rem;
  }
}

/* Landscape mode improvements */
@media (orientation: landscape) and (max-height: 600px) {
  .site-header {
    padding: 1rem 0;
    padding-top: calc(1rem + var(--safe-area-inset-top));
  }

  .hero {
    padding: 2rem 0 1.5rem;
  }

  .post-card {
    margin-bottom: 2rem;
    padding: 1.5rem;
  }
}

/* High-resolution displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .nav,
  .post-tags,
  .comments-container,
  .table-of-contents,
  .social-media-list,
  .contact-note {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .post-card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-card {
  animation: fadeInUp 0.6s ease-out forwards;
}

.post-card:nth-child(2) {
  animation-delay: 0.2s;
}

.post-card:nth-child(3) {
  animation-delay: 0.4s;
}

/* Smooth scrolling and selection */
::selection {
  background: var(--accent);
  color: white;
}

/* Focus styles for accessibility */
:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* =========================
   TAG FILTER UI
========================= */

.tag-filter-section {
  margin: 2rem 0 1rem;
  padding: 1.5rem;
  background: linear-gradient(135deg,var(--bg-secondary),var(--bg-soft));
  border-radius: 24px;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
}

.filter-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

/* Filter buttons */
.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag-filter {
  padding: 0.45rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s ease;
}

.tag-filter:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

/* active tag */
.tag-filter.active {
  background: var(--accent-gradient);
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

/* indicator */
.active-filter-indicator {
  margin: 1rem 0 2rem;
  padding: 0.6rem 1rem;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* =========================
   FILTER ANIMATION
========================= */

.post-card {
  transition: opacity .25s ease, transform .25s ease;
}

.post-card.hide {
  opacity: 0;
  transform: scale(.95);
  pointer-events: none;
}

.post-card.show {
  opacity: 1;
  transform: scale(1);
}

/* empty state */
.no-posts-message {
  margin: 2rem 0;
  padding: 2rem;
  text-align: center;
  background: var(--bg-secondary);
  border-radius: 24px;
  border: 2px dashed var(--border);
}

.reset-filter-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
}

.reset-filter-btn:hover {
  text-decoration: underline;
}