/* CSS Custom Properties */
:root {
  /* Google-inspired Colors */
  --primary-color: #4285f4;
  --primary-dark: #1a73e8;
  --secondary-color: #34a853;
  --accent-color: #ea4335;
  --warning-color: #fbbc04;
  --success-color: #34a853;
  --error-color: #ea4335;
  
  /* Neutral Colors */
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-muted: #9aa0a6;
  --border-color: #dadce0;
  --background: #ffffff;
  --surface: #f8f9fa;
  --hover-bg: #f1f3f4;
  
  /* Dark Theme Colors */
  --dark-bg: #131314;
  --dark-surface: #1f1f1f;
  --dark-text-primary: #e8eaed;
  --dark-text-secondary: #9aa0a6;
  --dark-border: #3c4043;
  --dark-hover-bg: #2d2e30;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-base: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --shadow-base: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 2px 6px 2px rgba(60, 64, 67, 0.15);
  --shadow-lg: 0 4px 4px 0 rgba(60, 64, 67, 0.3), 0 8px 12px 6px rgba(60, 64, 67, 0.15);
  --shadow-xl: 0 6px 10px 4px rgba(60, 64, 67, 0.15), 0 2px 3px rgba(60, 64, 67, 0.3);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-base: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
}

/* Dark Theme */
[data-theme="dark"] {
  --text-primary: var(--dark-text-primary);
  --text-secondary: var(--dark-text-secondary);
  --background: var(--dark-bg);
  --surface: var(--dark-surface);
  --border-color: var(--dark-border);
  --hover-bg: var(--dark-hover-bg);
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: var(--spacing-base);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-base);
  color: var(--text-secondary);
}

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

a:hover {
  color: var(--primary-dark);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-base);
}

.main-content {
  min-height: calc(100vh - var(--header-height));
  padding-top: var(--header-height);
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
}

.content-area {
  min-width: 0;
}

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-base));
  height: fit-content;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--background);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-base);
}

.navbar {
  height: var(--header-height);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.logo svg {
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  padding: var(--spacing-sm) var(--spacing-base);
  border-radius: var(--radius-base);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-base);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  padding: var(--spacing-sm);
  border-radius: var(--radius-base);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

.theme-icon {
  display: none;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  color: white;
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn-ghost:hover {
  background-color: var(--hover-bg);
  color: var(--text-primary);
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: var(--spacing-3xl) 0;
  margin-bottom: var(--spacing-2xl);
}

.hero-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 600;
  margin-bottom: var(--spacing-base);
  color: white;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

.hero-search {
  display: flex;
  max-width: 500px;
  margin: 0 auto;
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-xs);
  box-shadow: var(--shadow-lg);
}

.search-input {
  flex: 1;
  border: none;
  padding: var(--spacing-base);
  font-size: var(--font-size-base);
  background: transparent;
  color: var(--text-primary);
}

.search-input:focus {
  outline: none;
}

.search-btn {
  background-color: var(--primary-color);
  border: none;
  padding: var(--spacing-base);
  border-radius: var(--radius-base);
  color: white;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-btn:hover {
  background-color: var(--primary-dark);
}

/* Sections */
.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: var(--spacing-sm);
}

.filter-tab {
  background: none;
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-base);
  border-radius: var(--radius-base);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tab:hover,
.filter-tab.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

/* Featured Grid */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

/* Posts Grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Post Card */
.post-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.post-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--hover-bg);
}

.post-content {
  padding: var(--spacing-lg);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.post-category {
  background-color: var(--primary-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.post-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

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

.post-excerpt {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.5;
}

.post-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.read-more-btn {
  color: var(--primary-color);
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.post-stats {
  display: flex;
  align-items: center;
  gap: var(--spacing-base);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* Load More */
.load-more-container {
  text-align: center;
  margin-top: var(--spacing-xl);
}

.load-more-btn {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  padding: var(--spacing-base) var(--spacing-xl);
  border-radius: var(--radius-base);
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.load-more-btn:hover {
  background-color: var(--hover-bg);
  border-color: var(--primary-color);
}

/* Sidebar Widgets */
.sidebar-widget {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.widget-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-base);
  color: var(--text-primary);
}

.widget-text {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-base);
}

/* Newsletter Widget */
.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.newsletter-input {
  padding: var(--spacing-base);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  background: var(--background);
  color: var(--text-primary);
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.newsletter-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: var(--spacing-base);
  border-radius: var(--radius-base);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.newsletter-btn:hover {
  background-color: var(--primary-dark);
}

/* Categories List */
.categories-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.category-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  border-radius: var(--radius-base);
  transition: background-color var(--transition-fast);
}

.category-item:hover {
  background-color: var(--hover-bg);
}

.category-name {
  color: var(--text-primary);
  font-weight: 500;
}

.category-count {
  background-color: var(--hover-bg);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
}

/* Trending List */
.trending-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
}

.trending-item {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius-base);
  transition: background-color var(--transition-fast);
}

.trending-item:hover {
  background-color: var(--hover-bg);
}

.trending-image {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-base);
  object-fit: cover;
  background: var(--hover-bg);
  flex-shrink: 0;
}

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

.trending-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  line-height: 1.3;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.trending-meta {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* Ad Container */
.ad-container {
  background: var(--hover-bg);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-base);
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--text-muted);
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: 1000;
}

.dropdown:hover .dropdown-menu,
.dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-base);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background-color: var(--hover-bg);
  color: var(--text-primary);
}

/* User Menu */
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.user-avatar:hover {
  border-color: var(--primary-color);
}

.user-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.user-dropdown {
  right: 0;
  left: auto;
  min-width: 220px;
}

.user-info {
  padding: var(--spacing-base);
}

.user-name {
  font-weight: 600;
  color: var(--text-primary);
}

.user-role {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-transform: capitalize;
}

.logout-item {
  color: var(--error-color);
}

.logout-item:hover {
  background-color: rgba(234, 67, 53, 0.1);
  color: var(--error-color);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
}

.mobile-menu-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

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

@keyframes slideIn {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.slide-in {
  animation: slideIn 0.3s ease forwards;
}

/* Loading States */
.loading {
  animation: pulse 1.5s ease-in-out infinite;
}

.skeleton {
  background: linear-gradient(90deg, var(--hover-bg) 25%, transparent 37%, var(--hover-bg) 63%);
  background-size: 400% 100%;
  animation: skeleton 1.5s ease-in-out infinite;
}

@keyframes skeleton {
  0% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0 50%;
  }
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-sm { gap: var(--spacing-sm); }
.gap-base { gap: var(--spacing-base); }
.gap-lg { gap: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-base { margin-bottom: var(--spacing-base); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-sm { padding: var(--spacing-sm); }
.p-base { padding: var(--spacing-base); }
.p-lg { padding: var(--spacing-lg); }

/* Print Styles */
@media print {
  .header,
  .sidebar,
  .footer,
  .btn,
  .ad-container {
    display: none;
  }
  
  .main-layout {
    grid-template-columns: 1fr;
  }
  
  .post-card {
    border: 1px solid #000;
    margin-bottom: 20px;
    break-inside: avoid;
  }
}