/* ========================================
   BLOG PORTAL STYLES
   Cybersecurity Club - Uttara University
   ======================================== */

/* CSS Variables */
:root {
  --blog-gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --blog-gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --blog-hero-gradient: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  --blog-card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --blog-card-hover-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  --blog-border-radius: 20px;
  --blog-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Blog Portal Main */
.blog-portal-main {
  min-height: calc(100vh - 80px);
  background: #ffffff;
}

/* ========================================
   BLOG HERO SECTION
   ======================================== */
.blog-hero {
  position: relative;
  min-height: 70vh;
  background: var(--blog-hero-gradient);
  display: flex;
  align-items: center;
  overflow: hidden;
  color: white;
}

.blog-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  animation: float 6s ease-in-out infinite;
}

.blog-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  animation: fadeInUp 1s ease-out;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 12px 24px;
  border-radius: 50px;
  margin-bottom: 30px;
  font-size: 0.9rem;
  font-weight: 600;
  animation: slideIn 1s ease-out 0.3s both;
}

.blog-hero-title {
  font-size: 4rem;
  font-weight: 900;
  margin: 0 0 20px 0;
  line-height: 1.1;
  animation: fadeInUp 1s ease-out 0.5s both;
}

.title-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.blog-hero-subtitle {
  font-size: 1.3rem;
  line-height: 1.6;
  margin: 0;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
  animation: fadeInUp 1s ease-out 0.7s both;
}

/* ========================================
   FEATURED BLOG SECTION
   ======================================== */
.featured-blog-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
  animation: fadeInUp 0.8s ease-out;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-color);
  margin: 0 0 15px 0;
  line-height: 1.2;
}

.section-title.main-title {
  font-size: 5rem;
  font-weight: 800;
  line-height: 5rem;
  margin: 0 auto 30px auto;
  text-align: center;
  color: var(--text-color);
  width: 100%;
  display: block;
}

.section-subtitle {
  font-size: 1.3rem;
  color: #0000FF;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
  font-weight: 700;
}

.featured-blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 40px;
}

.featured-blog-card {
  background: #ffffff;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
  transition: var(--blog-transition);
  border: 1px solid #e0e0e0;
}

.featured-blog-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  border-color: #667eea;
}

.featured-blog-image {
  position: relative;
  height: 300px;
  overflow: hidden;
}

.featured-blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.featured-blog-card:hover .featured-blog-image img {
  transform: scale(1.1);
}

.blog-category {
  position: absolute;
  top: 20px;
  left: 20px;
  background: var(--blog-gradient-primary);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  z-index: 2;
}

.blog-reading-time {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  color: white;
  padding: 8px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
  z-index: 2;
}

.featured-blog-content {
  padding: 30px;
}

.blog-meta {
  display: flex;
  gap: 20px;
  margin-bottom: 15px;
  font-size: 0.9rem;
  color: var(--light-text-color);
  flex-wrap: wrap;
}

.blog-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.blog-author {
  font-weight: 600;
  color: var(--link-color);
}

.featured-blog-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 15px;
  line-height: 1.4;
  transition: color 0.3s ease;
}

.featured-blog-card:hover .featured-blog-title {
  color: var(--link-color);
}

.featured-blog-excerpt {
  color: var(--light-text-color);
  line-height: 1.7;
  margin-bottom: 20px;
  font-size: 1rem;
}

.blog-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.blog-tag {
  background: rgba(102, 126, 234, 0.1);
  color: #667eea;
  padding: 6px 12px;
  border-radius: 15px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(102, 126, 234, 0.2);
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all 0.3s ease;
}

.blog-tag:hover {
  background: rgba(102, 126, 234, 0.2);
  transform: scale(1.05);
}

.read-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #667eea;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.read-more-btn:hover {
  color: #764ba2;
  border-bottom-color: #764ba2;
  gap: 12px;
}

.read-more-btn i {
  transition: transform 0.3s ease;
}

.read-more-btn:hover i {
  transform: translateX(5px);
}

/* ========================================
   SEARCH & FILTER SECTION
   ======================================== */
.blog-filter-section {
  padding: 60px 0 40px 0;
  background: #ffffff;
}

.blog-search {
  max-width: 600px;
  margin: 0 auto 40px auto;
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
  background: #ffffff;
  border-radius: 50px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  border: 2px solid #e0e0e0;
  transition: var(--blog-transition);
}

.search-container:focus-within {
  border-color: #667eea;
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.search-icon {
  position: absolute;
  left: 20px;
  color: var(--light-text-color);
  font-size: 1.1rem;
  z-index: 2;
}

.blog-search-input {
  width: 100%;
  padding: 18px 20px 18px 50px;
  border: none;
  outline: none;
  font-size: 1rem;
  background: transparent;
  color: var(--text-color);
  font-family: 'JetBrains Mono', monospace;
}

.blog-search-input::placeholder {
  color: var(--light-text-color);
}

.search-clear {
  position: absolute;
  right: 15px;
  background: rgba(102, 126, 234, 0.1);
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #667eea;
  transition: var(--blog-transition);
}

.search-clear:hover {
  background: rgba(102, 126, 234, 0.2);
  transform: scale(1.1);
}

.search-clear.hidden {
  display: none;
}

.category-filter {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 2px solid #e0e0e0;
  color: var(--text-color);
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--blog-transition);
  position: relative;
  overflow: hidden;
  font-family: 'JetBrains Mono', monospace;
}

.filter-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--blog-gradient-primary);
  transition: left 0.3s ease;
  z-index: 0;
}

.filter-btn i,
.filter-btn span {
  position: relative;
  z-index: 1;
  transition: color 0.3s ease;
}

.filter-btn:hover::before,
.filter-btn.active::before {
  left: 0;
}

.filter-btn:hover,
.filter-btn.active {
  color: white;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--blog-card-shadow);
}

/* ========================================
   ALL BLOGS SECTION
   ======================================== */
.all-blogs-section {
  padding: 60px 0 80px 0;
  background: #ffffff;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blog-gradient-primary);
  color: white;
  padding: 10px 20px;
  border-radius: 50px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: var(--blog-card-shadow);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.blog-card {
  background: #ffffff;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
  transition: var(--blog-transition);
  border: 1px solid #e0e0e0;
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
  border-color: #667eea;
}

.blog-card-image {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.blog-card-content {
  padding: 25px;
}

.blog-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 12px;
  line-height: 1.4;
  transition: color 0.3s ease;
}

.blog-card:hover .blog-card-title {
  color: var(--link-color);
}

.blog-card-excerpt {
  color: var(--light-text-color);
  line-height: 1.6;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

/* ========================================
   NEWSLETTER SECTION
   ======================================== */
.newsletter-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.newsletter-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.newsletter-text h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 15px;
  line-height: 1.2;
}

.newsletter-text p {
  font-size: 1.1rem;
  opacity: 0.9;
  line-height: 1.6;
}

.newsletter-form form {
  display: flex;
  gap: 15px;
}

.newsletter-form input {
  flex: 1;
  padding: 18px 24px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border-radius: 50px;
  color: white;
  font-size: 1rem;
  font-family: 'JetBrains Mono', monospace;
  transition: var(--blog-transition);
}

.newsletter-form input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.newsletter-form input:focus {
  outline: none;
  border-color: white;
  background: rgba(255, 255, 255, 0.2);
}

.newsletter-form button {
  padding: 18px 32px;
  background: white;
  color: #667eea;
  border: none;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--blog-transition);
  font-family: 'JetBrains Mono', monospace;
}

.newsletter-form button:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* ========================================
   LOAD MORE & NO RESULTS
   ======================================== */
.load-more-section {
  text-align: center;
  margin-top: 60px;
}

.load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--blog-gradient-primary);
  color: white;
  border: none;
  padding: 18px 36px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--blog-transition);
  box-shadow: var(--blog-card-shadow);
  font-family: 'JetBrains Mono', monospace;
}

.load-more-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--blog-card-hover-shadow);
}

.load-more-btn .btn-icon {
  transition: transform 0.3s ease;
}

.load-more-btn:hover .btn-icon {
  transform: translateY(2px);
}

.loading-indicator {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
  color: var(--light-text-color);
  font-size: 0.9rem;
}

.loading-indicator.show {
  display: flex;
}

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top: 2px solid #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--light-text-color);
}

.no-results.hidden {
  display: none;
}

.no-results i {
  font-size: 4rem;
  margin-bottom: 20px;
  color: #667eea;
  opacity: 0.5;
}

.no-results h3 {
  font-size: 1.5rem;
  margin: 0 0 10px 0;
  color: var(--text-color);
}

.no-results p {
  font-size: 1rem;
  margin: 0;
}

/* ========================================
   SCROLL TO TOP
   ======================================== */
.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--blog-gradient-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--blog-transition);
  z-index: 1000;
  box-shadow: var(--blog-card-shadow);
}

.scroll-to-top.show {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--blog-card-hover-shadow);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
  .section-title.main-title {
    font-size: 4rem;
    line-height: 4rem;
  }
  
  .featured-blog-grid {
    grid-template-columns: 1fr;
  }
  
  .newsletter-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .newsletter-form form {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .blog-hero-title {
    font-size: 2.5rem;
  }
  
  .section-title.main-title {
    font-size: 3rem;
    line-height: 3rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .category-filter {
    gap: 10px;
  }
  
  .filter-btn {
    padding: 10px 16px;
    font-size: 0.8rem;
  }
  
  .newsletter-text h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .blog-hero {
    min-height: 50vh;
  }
  
  .blog-hero-title {
    font-size: 2rem;
  }
  
  .section-title.main-title {
    font-size: 2.5rem;
    line-height: 2.5rem;
  }
  
  .featured-blog-section,
  .all-blogs-section {
    padding: 60px 0;
  }
  
  .container {
    padding: 0 15px;
  }
  
  .featured-blog-content,
  .blog-card-content {
    padding: 20px;
  }
  
  .newsletter-section {
    padding: 60px 0;
  }
  
  .newsletter-text h2 {
    font-size: 1.8rem;
  }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Light theme optimization */
@media (prefers-color-scheme: light) {
  .blog-portal-main {
    background: #ffffff;
  }
  
  .featured-blog-section {
    background: #f8f9fa;
  }
  
  .blog-filter-section,
  .all-blogs-section {
    background: #ffffff;
  }
}