/* ==========================================================================
   MINIMALIST MODERN DARKER GREY E-INK DESIGN SYSTEM
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,600;1,6..72,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Dark Charcoal Grey E-Ink Theme Palette (Zero Glare, Eye Comfort) */
  --bg-primary: #334155;          /* Darker slate grey background (zero glare) */
  --bg-surface: #1e293b;          /* Matte dark slate surface */
  --bg-surface-hover: #0f172a;    /* Deeper hover state for buttons/pills */
  --bg-card: #273548;             /* Rich dark grey card container */
  
  --text-primary: #f8fafc;        /* Crisp off-white paper ink text */
  --text-secondary: #cbd5e1;      /* Soft light grey text */
  --text-muted: #94a3b8;          /* Muted slate text */
  
  --accent-primary: #f8fafc;      /* Solid light accent */
  --accent-secondary: #cbd5e1;
  --accent-hover: #ffffff;
  --accent-gradient: linear-gradient(135deg, #f8fafc 0%, #cbd5e1 100%);
  --accent-light: rgba(248, 250, 252, 0.12);
  
  --border-color: #475569;        /* Soft dark grey border */
  --border-hover: #64748b;
  
  --glass-bg: rgba(51, 65, 85, 0.95);
  --glass-border: rgba(71, 85, 105, 0.8);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 22px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 14px 28px rgba(0, 0, 0, 0.35);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Newsreader', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}



/* Base resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* Link Base */
a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 820px;
}

/* Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5rem;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.logo-brand img {
  filter: invert(1) brightness(2);
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0 2.5rem;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

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

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 2.5rem;
}

/* Search and Filter Controls */
.filter-controls {
  width: 100%;
  max-width: 100%;
  margin: 0 auto 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-input {
  width: 100%;
  padding: 0.9rem 1.25rem 0.9rem 3rem;
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--text-primary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  pointer-events: none;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 0.5rem;
  width: 100%;
}

.tag-pill {
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tag-pill:hover, .tag-pill.active {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
  transform: translateY(-1px);
}

/* Blog Cards Grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md, 16px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  border-color: var(--border-hover);
}

.post-card-link {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.4rem;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.post-card-top {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  margin-bottom: 0.85rem;
}

.post-card-thumb {
  width: 80px;
  height: 45px;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm, 6px);
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.post-card-header-text {
  flex: 1;
  min-width: 0;
}

.post-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-fast);
}

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

.post-card-submeta {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.post-card-category,
.post-card-author,
.post-card-date {
  color: var(--text-muted);
  font-weight: 600;
}

.post-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.86rem;
  line-height: 1.45;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.author-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.author-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.read-more-link {
  font-size: 0.85rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--text-primary);
}

/* Single Post Header / Hero */
.breadcrumb-nav {
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: flex-start;
  text-align: left;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.45rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.breadcrumb-list a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-list a:hover {
  color: var(--text-primary);
}

.breadcrumb-separator {
  opacity: 0.4;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 700;
  max-width: 340px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.post-header {
  padding: 4rem 0 2rem;
  text-align: center;
}

.post-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.post-main-title {
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.post-cover-container {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 520px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.post-cover-img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

/* Scroll Progress Bar */
.scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: 101;
  background: transparent;
}

.scroll-progress-bar {
  height: 100%;
  background: var(--text-primary);
  width: 0%;
  transition: width 0.1s ease;
}

/* Mobile Menu Hamburger Button & Overlay */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  z-index: 102;
}

.hamburger-bar {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-primary);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 2rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
}

.mobile-menu-close {
  background: transparent;
  border: none;
  font-size: 2.5rem;
  color: var(--text-primary);
  cursor: pointer;
  line-height: 1;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
}

.mobile-nav-link {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.mobile-nav-link.active, .mobile-nav-link:hover {
  color: var(--text-primary);
}

/* Responsive adjustments (iPhone 13 Pro Max & Mobile/Tablets) */
@media (max-width: 960px) {
  #desktop-nav-menu {
    display: none !important;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .container {
    padding: 0 1.25rem;
  }

  .nav-wrapper {
    height: 4rem;
  }

  .logo-brand img {
    height: 44px !important;
  }

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

  .posts-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .post-header {
    padding: 2rem 0 1.25rem;
  }

  .post-main-title {
    font-size: 1.75rem;
    line-height: 1.25;
  }

  .post-meta-bar {
    flex-wrap: wrap;
    font-size: 0.82rem;
    gap: 0.35rem 0.5rem;
    justify-content: flex-start;
  }

  .post-cover-container {
    max-height: 240px;
    margin-bottom: 1.75rem;
  }

  .related-tags-container {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .related-tags-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    width: 100%;
  }

  .tag-pill-rect {
    padding: 0.35rem 0.7rem;
    font-size: 0.85rem;
    word-break: break-word;
  }

  .related-compact-card {
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem;
  }

  .related-compact-thumb {
    width: 70px;
    height: 40px;
    aspect-ratio: 16 / 9;
    max-height: none;
  }
}

/* ==========================================================================
   RELATED TAGS & RELATED POSTS SECTION
   ========================================================================== */
.post-tag-badge-link {
  display: inline;
  color: var(--text-muted);
  font-weight: 600;
  background: transparent;
  border: none;
  padding: 0;
  border-radius: 0;
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}

.post-tag-badge-link:hover {
  background: transparent;
  color: var(--text-primary);
  text-decoration: underline;
}

.breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}

.breadcrumb-link:hover {
  color: var(--accent-primary, #e63946);
  text-decoration: underline;
}

.related-posts-section {
  margin-top: 4rem;
  margin-bottom: 4rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--border-color);
}

.related-tags-container {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0;
  background: transparent;
  border: none;
}

.related-tags-heading {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.35rem;
  white-space: nowrap;
}

.related-posts-heading {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.related-tags-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 0.75rem;
  flex: 1;
}

.tag-pill-rect {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-card, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 6px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.tag-pill-rect:hover {
  border-color: var(--text-primary);
  transform: translateY(-1px);
}

.related-compact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

@media (max-width: 768px) {
  .related-compact-grid {
    grid-template-columns: 1fr;
  }
}

.related-compact-card {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-card, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-md, 8px);
  padding: 1.25rem;
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.related-compact-card:hover {
  transform: translateY(-2px);
  border-color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

.related-compact-content {
  flex: 1;
  min-width: 0;
}

.related-compact-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin: 0 0 0.4rem 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-compact-excerpt {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.35;
  margin: 0 0 0.4rem 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-compact-meta {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.76rem;
  color: var(--text-muted, #64748b);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.related-compact-meta .meta-divider {
  font-size: 0.72rem;
  opacity: 0.6;
}

.related-compact-thumb {
  width: 104px;
  height: 58.5px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm, 6px);
  flex-shrink: 0;
}

/* ==========================================================================
   CATEGORY CARDS SHOWCASE GRID
   ========================================================================== */
/* ==========================================================================
   SIMPLE CATEGORY PILLS BAR
   ========================================================================== */
.category-cards-grid {
  margin: 1.5rem 0 2.5rem;
  width: 100%;
}

.category-pills-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  width: 100%;
}

.simple-category-pill {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: all var(--transition-fast);
}

.simple-category-pill:hover {
  color: var(--text-primary);
  background: var(--accent-light);
}

.simple-category-pill.active {
  color: var(--text-primary);
  font-weight: 700;
  background: rgba(255, 255, 255, 0.12);
}

.cat-count {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
}

.simple-category-pill.active .cat-count {
  color: var(--accent-hover);
}

.cat-pipe {
  color: var(--border-color);
  font-weight: 400;
  user-select: none;
}