:root {
  /* Color Palette - Clean white theme with blue accents */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-elevated: #f1f5f9;

  --color-primary: #2563eb;
  --color-primary-light: #3b82f6;
  --color-primary-dark: #1d4ed8;

  --color-accent: #0ea5e9;
  --color-accent-light: #38bdf8;

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-info: #06b6d4;

  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;

  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%);
  --gradient-card: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
  --gradient-overlay: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.9) 100%);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;

  /* Effects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.2);

  --blur-sm: blur(4px);
  --blur-md: blur(8px);
  --blur-lg: blur(16px);

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 {
  font-size: 3.5rem;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 2rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

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

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

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

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: var(--blur-md);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 0.5rem;
  transition: all var(--transition-base);
  position: relative;
}

.nav-links a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--gradient-hero);
  transition: transform var(--transition-base);
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-links a:hover::before {
  transform: translateX(-50%) scaleX(1);
}

/* Hero Section */
.hero {
  position: relative;
  padding: var(--spacing-2xl) var(--spacing-lg);
  background: var(--gradient-hero);
  overflow: hidden;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path fill="%23ffffff" fill-opacity="0.1" d="M0,0 L50,10 L100,5 L150,20 L200,15 L250,25 L300,20 L350,30 L400,25 L450,35 L500,30 L550,40 L600,35 L650,45 L700,40 L750,50 L800,45 L850,55 L900,50 L950,60 L1000,55 L1050,65 L1100,60 L1150,70 L1200,65 L1200,120 L0,120 Z"/></svg>');
  background-size: cover;
  animation: wave 20s linear infinite;
}

@keyframes wave {
  0% {
    background-position-x: 0;
  }

  100% {
    background-position-x: 1200px;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero h1 {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  animation: fadeInUp 1s ease-out;
  color: white;
}

.hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

/* Category Filter */
.filter-bar {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  align-items: center;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  border-radius: 2rem;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition-base);
  font-family: var(--font-sans);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: var(--gradient-hero);
  border-color: transparent;
  color: white;
  box-shadow: var(--shadow-glow);
}

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

.news-card {
  background: var(--color-bg-card);
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  animation: fadeIn 0.6s ease-out;
  box-shadow: var(--shadow-sm);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.news-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
  z-index: 0;
}

.news-card:hover::before {
  opacity: 1;
}

.news-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.news-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.news-card-image.hidden {
  display: none;
}

.news-card-content {
  padding: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.news-card-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  border-radius: 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.news-card-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  font-weight: 700;
}

.news-card-excerpt {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.news-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.news-card-author {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.news-card-date {
  font-size: 0.85rem;
}

/* Article Page */
.article-header {
  max-width: 900px;
  margin: 0 auto var(--spacing-xl);
  text-align: center;
  padding-top: var(--spacing-xl);
}

.article-category {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: var(--gradient-hero);
  color: white;
  border-radius: 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.article-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.article-featured-image {
  width: 100%;
  max-height: 500px;
  object-fit: cover;
  border-radius: 1rem;
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.article-content p {
  margin-bottom: var(--spacing-md);
}

.article-content h2,
.article-content h3 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

/* Related Posts Section */
.related-posts-section {
  max-width: 800px;
  margin: var(--spacing-2xl) auto;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.related-posts-heading {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
  text-align: center;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.related-post-card {
  display: block;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  transition: all var(--transition-base);
  text-decoration: none;
}

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

.related-post-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  line-height: 1.4;
}

.related-post-link {
  font-size: 0.9rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* Admin Form */
.admin-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: 0.95rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-textarea {
  min-height: 200px;
  resize: vertical;
  font-family: 'Monaco', 'Courier New', monospace;
  line-height: 1.6;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--gradient-hero);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn:active {
  transform: translateY(0);
}

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

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

/* Loading & Empty States */
.loading {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
  font-size: 1.25rem;
}

.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
}

.empty-state h3 {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* Alert Messages */
.alert {
  padding: var(--spacing-md);
  border-radius: 0.5rem;
  margin-bottom: var(--spacing-lg);
  border-left: 4px solid;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: #ef4444;
  color: #ef4444;
}

/* Footer */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  text-align: center;
  color: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .article-title {
    font-size: 2.5rem;
  }

  .nav-links {
    gap: var(--spacing-sm);
  }

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

  .container {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-muted);
}

.mt-2 {
  margin-top: var(--spacing-lg);
}

.mb-2 {
  margin-bottom: var(--spacing-lg);
}