/* ==========================================================================
   CrypticPulse - Modern Crypto & Bitcoin Blog Design System
   URL: https://crypticpulse.github.io
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & CSS Variables (Dark Mode First)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Dark Theme Default */
  --bg-primary: #0b0e17;
  --bg-secondary: #131b2e;
  --bg-card: #192338;
  --bg-hover: #212d47;
  
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-green: #00ff9d;
  --accent-green-glow: rgba(0, 255, 157, 0.15);
  --accent-cyan: #00f0ff;
  --accent-cyan-glow: rgba(0, 240, 255, 0.15);
  --accent-red: #ff4d6d;
  --accent-red-glow: rgba(255, 77, 109, 0.15);
  --accent-purple: #a855f7;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(0, 240, 255, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(0, 255, 157, 0.2);

  /* Fonts & Radius */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Header & Ticker Heights */
  --ticker-height: 40px;
  --header-height: 70px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-green: #059669;
  --accent-green-glow: rgba(5, 150, 105, 0.12);
  --accent-cyan: #0284c7;
  --accent-cyan-glow: rgba(2, 132, 199, 0.12);
  --accent-red: #e11d48;
  --accent-red-glow: rgba(225, 29, 72, 0.12);
  
  --border-color: #e2e8f0;
  --border-color-hover: #94a3b8;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 15px rgba(2, 132, 199, 0.15);
}

/* --------------------------------------------------------------------------
   2. Reset & Baseline
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --------------------------------------------------------------------------
   3. Live Ticker Bar
   -------------------------------------------------------------------------- */
.ticker-bar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  height: var(--ticker-height);
  display: flex;
  align-items: center;
  overflow: hidden;
  position: relative;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  z-index: 100;
}

.ticker-label {
  background: var(--accent-green);
  color: #0b0e17;
  font-weight: 700;
  padding: 0 1rem;
  height: 100%;
  display: flex;
  align-items: center;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.75rem;
  white-space: nowrap;
  z-index: 2;
}

.ticker-wrap {
  display: flex;
  width: 100%;
  overflow: hidden;
}

.ticker-content {
  display: flex;
  align-items: center;
  gap: 2rem;
  white-space: nowrap;
  animation: tickerSlide 35s linear infinite;
  padding-left: 1rem;
}

.ticker-wrap:hover .ticker-content {
  animation-play-state: paused;
}

@keyframes tickerSlide {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.ticker-item .symbol {
  font-weight: 700;
  color: var(--text-primary);
}

.ticker-item .price {
  color: var(--text-secondary);
}

.ticker-item .change {
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.75rem;
}

.ticker-item .change.up {
  color: var(--accent-green);
  background: var(--accent-green-glow);
}

.ticker-item .change.down {
  color: var(--accent-red);
  background: var(--accent-red-glow);
}

/* Flash Animations on Price Update */
.flash-up {
  animation: flashGreen 0.6s ease;
}
.flash-down {
  animation: flashRed 0.6s ease;
}

@keyframes flashGreen {
  0% { background-color: var(--accent-green-glow); }
  100% { background-color: transparent; }
}
@keyframes flashRed {
  0% { background-color: var(--accent-red-glow); }
  100% { background-color: transparent; }
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  background-color: rgba(11, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 90;
  height: var(--header-height);
  transition: background-color var(--transition-normal);
}

[data-theme="light"] .site-header {
  background-color: rgba(255, 255, 255, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-logo svg {
  width: 32px;
  height: 32px;
}

.brand-logo span.pulse {
  color: var(--accent-green);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-cyan);
}

/* Top Theme Switcher Button */
.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-normal);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Mobile Hamburger Toggle */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-nav-toggle svg {
  width: 28px;
  height: 28px;
}

/* --------------------------------------------------------------------------
   5. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
  color: #0b0e17;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  color: #0b0e17;
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-hover);
  color: var(--accent-cyan);
}

.tag-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--accent-cyan-glow);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.2);
}

.tag-badge.bitcoin {
  background: rgba(247, 147, 26, 0.15);
  color: #f7931a;
  border-color: rgba(247, 147, 26, 0.3);
}

.tag-badge.defi {
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
  border-color: rgba(168, 85, 247, 0.3);
}

.tag-badge.altcoins {
  background: var(--accent-green-glow);
  color: var(--accent-green);
  border-color: rgba(0, 255, 157, 0.3);
}

.tag-badge.regulation {
  background: var(--accent-red-glow);
  color: var(--accent-red);
  border-color: rgba(255, 77, 109, 0.3);
}

/* --------------------------------------------------------------------------
   6. Hero & Cards Layout
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 3rem 0 2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.card-img-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
  background-color: var(--bg-secondary);
}

.card-img-wrap img, .card-img-wrap picture {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.825rem;
  color: var(--text-muted);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
}

.card-title a {
  color: var(--text-primary);
}

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

.card-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Featured Hero Styling */
.hero-featured .card-title {
  font-size: 1.8rem;
}

.hero-featured .card-body {
  padding: 2rem;
}

/* --------------------------------------------------------------------------
   7. Post Listing / Feed Section
   -------------------------------------------------------------------------- */
.section-title-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 3rem 0 1.5rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 24px;
  background: var(--accent-green);
  border-radius: var(--radius-full);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

/* Category Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-cyan);
  color: #0b0e17;
  border-color: var(--accent-cyan);
}

/* Search Bar Component */
.search-box {
  position: relative;
  max-width: 400px;
  width: 100%;
}

.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem 0.75rem 2.8rem;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent-cyan);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   8. Article Detail View (post.html)
   -------------------------------------------------------------------------- */
.post-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  padding: 2.5rem 0;
}

.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 1rem 0;
}

.post-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1rem 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.author-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-green);
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content h2 {
  font-size: 1.75rem;
  margin: 2.5rem 0 1rem;
  color: var(--text-primary);
  scroll-margin-top: 100px;
}

.post-content h3 {
  font-size: 1.35rem;
  margin: 2rem 0 0.8rem;
  scroll-margin-top: 100px;
}

.post-content blockquote {
  border-left: 4px solid var(--accent-cyan);
  background: var(--bg-card);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
}

/* Sidebar Table of Contents */
.sidebar-toc {
  position: sticky;
  top: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.toc-link {
  color: var(--text-secondary);
}

.toc-link:hover, .toc-link.active {
  color: var(--accent-green);
  font-weight: 600;
}

/* Social Share Bar */
.share-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 2.5rem 0;
  padding: 1rem 0;
  border-top: 1px solid var(--border-color);
}

.share-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   9. Comments Section (Interactive - post.html)
   -------------------------------------------------------------------------- */
.comments-section {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 2px solid var(--border-color);
}

.comments-header {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.comment-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 2.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--accent-cyan);
}

textarea.form-control {
  min-height: 110px;
  resize: vertical;
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.comment-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  gap: 1rem;
}

.comment-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.comment-content {
  flex-grow: 1;
}

.comment-author {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.comment-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.5rem;
}

.comment-text {
  margin-top: 0.4rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   10. Newsletter CTA Box
   -------------------------------------------------------------------------- */
.newsletter-box {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  margin: 4rem 0;
  position: relative;
  overflow: hidden;
}

.newsletter-box::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--accent-green-glow) 0%, transparent 60%);
  pointer-events: none;
}

.newsletter-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.newsletter-sub {
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto 1.75rem;
}

.newsletter-form {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   11. Cookie Banner & Push Notification Banner
   -------------------------------------------------------------------------- */
.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
  max-width: 520px;
  background: var(--bg-card);
  border: 1px solid var(--accent-cyan-glow);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transform: translateY(150%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.cookie-banner.show {
  transform: translateY(0);
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

.push-modal {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--accent-green);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transform: translateX(150%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.push-modal.show {
  transform: translateX(0);
}

/* --------------------------------------------------------------------------
   12. Static Content Pages (About, Contact, Legal)
   -------------------------------------------------------------------------- */
.page-header {
  padding: 3rem 0 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 3rem;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.legal-content {
  max-width: 800px;
  margin: 0 auto 4rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.legal-content h2 {
  color: var(--text-primary);
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
}

.legal-content p, .legal-content ul {
  margin-bottom: 1.25rem;
}

.legal-content ul {
  padding-left: 1.5rem;
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: 1rem;
  max-width: 320px;
  font-size: 0.9rem;
}

.footer-col h4 {
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   14. Responsive Queries
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .post-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-toc {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-nav-toggle {
    display: block;
  }
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
  }
  .main-nav.active {
    transform: translateY(0);
  }
  .nav-list {
    flex-direction: column;
    width: 100%;
    align-items: flex-start;
  }
  .newsletter-form {
    flex-direction: column;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
}