/* Custom Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

/* CSS Variables & Themes */
:root {
  /* Light Theme Colors (Default) */
  --bg-primary: #fafaf9;
  --bg-secondary: #f5f5f4;
  --bg-card: rgba(255, 255, 255, 0.85);
  --text-primary: #1c1917;
  --text-secondary: #78716c;
  --accent: #d97706; /* Warm Amber */
  --accent-gradient: linear-gradient(135deg, #f59e0b, #d97706);
  --accent-light: rgba(217, 119, 6, 0.1);
  --border: #e7e5e4;
  --border-focus: #d97706;
  --card-shadow: 0 10px 30px -10px rgba(120, 113, 108, 0.15), 0 1px 3px rgba(0, 0, 0, 0.02);
  --nav-bg: rgba(250, 250, 249, 0.8);
  --selection: rgba(217, 119, 6, 0.2);
  --text-muted: #a8a29e;
  
  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Layout */
  --max-width: 1200px;
  --max-width-article: 760px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Theme Colors */
  --bg-primary: #0c0a09;
  --bg-secondary: #1c1917;
  --bg-card: rgba(28, 25, 23, 0.7);
  --text-primary: #f5f5f4;
  --text-secondary: #a8a29e;
  --accent: #f59e0b;
  --accent-gradient: linear-gradient(135deg, #fbbf24, #f59e0b);
  --accent-light: rgba(245, 158, 11, 0.15);
  --border: #2e2a27;
  --border-focus: #f59e0b;
  --card-shadow: 0 15px 40px -20px rgba(0, 0, 0, 0.6), 0 1px 3px rgba(255, 255, 255, 0.01);
  --nav-bg: rgba(12, 10, 9, 0.8);
  --selection: rgba(245, 158, 11, 0.3);
  --text-muted: #57524d;
}

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

::selection {
  background-color: var(--selection);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  padding-bottom: 60px;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

/* Header & Navigation */
header.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-dot {
  width: 10px;
  height: 10px;
  background: var(--accent-gradient);
  border-radius: 50%;
  display: inline-block;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

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

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

/* Hero Section */
.hero {
  max-width: var(--max-width);
  margin: 4rem auto 3rem;
  padding: 0 2rem;
  text-align: center;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero h1 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

/* Search & Filter Controls */
.controls-container {
  max-width: var(--max-width);
  margin: 0 auto 3rem;
  padding: 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.search-wrapper {
  position: relative;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
}

.search-input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px var(--accent-light);
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
  width: 18px;
  height: 18px;
}

.tags-wrapper {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag-pill {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tag-pill:hover {
  background-color: var(--bg-secondary);
  transform: translateY(-1px);
}

.tag-pill.active {
  background: var(--accent-gradient);
  color: #ffffff;
  border-color: transparent;
}

/* Main Layout (Grid + Sidebar) */
.main-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3rem;
}

/* Blog Feed */
.blog-feed {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.post-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.1);
  border-color: var(--text-muted);
}

[data-theme="dark"] .post-card:hover {
  box-shadow: 0 20px 45px -15px rgba(0, 0, 0, 0.8);
  border-color: var(--text-secondary);
}

.card-image-wrapper {
  width: 100%;
  height: 260px;
  overflow: hidden;
  position: relative;
  background-color: var(--bg-secondary);
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.post-card:hover .card-image {
  transform: scale(1.03);
}

.card-content {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.card-description {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.read-more-btn {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.read-more-btn svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.post-card:hover .read-more-btn svg {
  transform: translateX(4px);
}

/* Sidebar styling */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.sidebar-widget {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
}

.widget-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
  border-left: 3px solid var(--accent);
  padding-left: 0.75rem;
}

.popular-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sidebar-tag {
  font-size: 0.8rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Google AdSense Styling & Placeholders */
.ad-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 2.5rem 0;
  padding: 1rem;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  position: relative;
  min-height: 120px;
}

.ad-container::before {
  content: 'ADVERTISEMENT';
  position: absolute;
  top: -9px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  padding: 0 0.5rem;
}

.sidebar-ad {
  min-height: 280px;
  margin: 0;
}

.banner-ad {
  max-width: var(--max-width);
  margin: 3rem auto;
  padding: 1rem;
  width: calc(100% - 4rem);
}

/* Article Page (post.html) Layout */
.article-header-wrapper {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 5rem 2rem 4rem;
  text-align: center;
  transition: background-color var(--transition-normal);
}

.article-header-container {
  max-width: var(--max-width-article);
  margin: 0 auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  transition: color var(--transition-fast);
}

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

.back-link svg {
  width: 18px;
  height: 18px;
}

.article-title {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.article-tags {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.article-tag {
  background-color: var(--accent-light);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
}

.article-cover-image-container {
  max-width: var(--max-width-article);
  margin: -3rem auto 3.5rem;
  padding: 0 2rem;
  position: relative;
  z-index: 10;
}

.article-cover-image {
  width: 100%;
  max-height: 450px;
  object-fit: cover;
  box-shadow: var(--card-shadow);
  border-radius: var(--radius-lg);
}

.article-body-container {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Markdown Content Styling */
.markdown-body {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.markdown-body p {
  margin-bottom: 1.75rem;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.markdown-body h1 { font-size: 2.25rem; }
.markdown-body h2 { font-size: 1.75rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.markdown-body h3 { font-size: 1.35rem; }

.markdown-body ul,
.markdown-body ol {
  margin-bottom: 1.75rem;
  padding-left: 1.5rem;
}

.markdown-body li {
  margin-bottom: 0.5rem;
}

.markdown-body blockquote {
  border-left: 4px solid var(--accent);
  padding: 0.75rem 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background-color: var(--bg-secondary);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
}

.markdown-body pre {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 2rem 0;
}

.markdown-body pre code {
  padding: 0;
  background-color: transparent;
  font-size: 0.95rem;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 1rem;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  text-align: left;
}

.markdown-body th {
  background-color: var(--bg-secondary);
  font-weight: 600;
}

/* Scroll Progress Bar */
.scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: transparent;
  z-index: 200;
}

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

/* Footer Section */
footer {
  margin-top: 5rem;
  padding: 4rem 2rem;
  border-top: 1px solid var(--border);
  background-color: var(--bg-secondary);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: background-color var(--transition-normal);
}

footer .footer-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

/* Empty State / Not Found */
.no-posts, .not-found-container {
  text-align: center;
  padding: 4rem 2rem;
  background-color: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  margin: 2rem 0;
}

.no-posts h3, .not-found-container h2 {
  font-family: var(--font-display);
  margin-bottom: 1rem;
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  
  .sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  
  .sidebar-ad {
    min-height: 120px;
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  .article-title {
    font-size: 2.25rem;
  }
  
  .sidebar {
    grid-template-columns: 1fr;
  }
  
  .sidebar-ad {
    grid-column: auto;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 1rem;
  }
  
  .hero {
    margin: 2.5rem auto 2rem;
    padding: 0 1rem;
  }
  
  .controls-container {
    padding: 0 1rem;
  }
  
  .main-layout {
    padding: 0 1rem;
  }
  
  .card-content {
    padding: 1.5rem;
  }
  
  .card-title {
    font-size: 1.5rem;
  }
  
  .article-header-wrapper {
    padding: 3.5rem 1rem 3rem;
  }
  
  .article-cover-image-container {
    padding: 0 1rem;
  }
  
  .article-body-container {
    padding: 0 1rem;
  }
}