/* ================================
   TYPOGRAPHY
   ================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: 'Share Tech', sans-serif;
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

h1 {
  font-size: var(--font-size-5xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-xl);
}

h2 {
  font-size: var(--font-size-4xl);
  color: var(--color-primary);
  margin-bottom: var(--space-xl);
}

h3 {
  font-size: var(--font-size-3xl);
  color: var(--color-primary-light);
  margin-bottom: var(--space-lg);
}

h4 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
}

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

a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -2px;
  left: 0;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

b, strong {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

i, em {
  font-style: italic;
  color: var(--color-text-secondary);
}

hr {
  height: 2px;
  background: var(--gradient-primary);
  border: none;
  margin: var(--space-3xl) auto;
  width: 120px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-glow);
}

/* ================================
   LAYOUT
   ================================ */

header {
  max-width: var(--container-xl);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-3xl) var(--space-xl);
  position: relative;
}

header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-primary) 50%,
    transparent 100%);
  opacity: 0.3;
}

main {
  min-height: calc(100vh - 400px);
}

footer {
  max-width: var(--container-xl);
  margin: var(--space-xl) auto 0;
  padding: var(--space-4xl) var(--space-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2xl);
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-primary) 50%,
    transparent 100%);
  opacity: 0.3;
}

section {
  max-width: var(--container-lg);
  margin: 0 auto;
}

/* ================================
   HEADER COMPONENTS
   ================================ */

#logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-slow);
}

#logo circle,
#logo polygon,
#logo rect {
  transition: all var(--transition-base);
}

#site-title {
  margin: var(--space-lg) 0 0 0;
  font-size: var(--font-size-2xl);
  letter-spacing: 0.1em;
  color: #ffffff !important;
  font-weight: var(--font-weight-bold);
  transition: all 0.3s ease;
  background: none !important;
  -webkit-background-clip: unset !important;
  -webkit-text-fill-color: unset !important;
  background-clip: unset !important;
}

#logo:hover #site-title {
  color: #5cffe4 !important;
}

/* ================================
   ARTICLE FEED
   ================================ */

#article-feed {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: var(--space-xl);
}

#category-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
  position: relative;
  padding: var(--space-xl);
}

#category-buttons::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-divider) 50%,
    transparent 100%);
}

.category-button {
  padding: var(--space-md) var(--space-xl);
  border: 2px solid var(--color-border);
  background: var(--color-background-card);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
}

.category-button:hover {
  border-color: #5cffe4;
  color: #5cffe4;
  background: rgba(92, 255, 228, 0.1);
  transform: translateY(-2px);
}

.category-button.active {
  border-color: var(--color-primary);
  background: var(--gradient-primary);
  color: var(--color-black);
}

.articles {
  padding: var(--space-3xl) 0;
  position: relative;
}

.articles::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-divider) 50%,
    transparent 100%);
}

.articles:last-child::after,
.articles.last-visible::after,
#article-feed .articles.last-visible::after {
  display: none !important;
}

.article-card {
  background: var(--color-background-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.article-card:hover {
  border-color: var(--color-primary);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-4px);
}

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


.article-title {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  font-weight: var(--font-weight-bold);
  transition: color var(--transition-base);
}

.article-card:hover .article-title {
  color: #5cffe4;
}

.article-excerpt {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-lg);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
}

.read-more svg {
  transition: transform var(--transition-base);
}

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

/* ================================
   ARTICLE PAGE
   ================================ */

#article {
  max-width: var(--container-md);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border);
  background: var(--color-background-card);
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xl);
  transition: all var(--transition-base);
  cursor: pointer;
}

.back-button:hover {
  border-color: #5cffe4;
  color: #5cffe4;
  background: rgba(92, 255, 228, 0.1);
  transform: translateX(-4px);
}

.back-button svg {
  transition: transform var(--transition-base);
}

.back-button:hover svg {
  transform: translateX(-2px);
}

#title {
  margin: var(--space-xl) 0 var(--space-xl) 0 !important;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-divider);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

.meta-item svg {
  color: var(--color-primary);
  width: 18px;
  height: 18px;
}

#content {
  margin-bottom: var(--space-3xl);
  line-height: var(--line-height-loose);
}

#content img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  margin: var(--space-2xl) 0;
  box-shadow: var(--shadow-xl);
}

#content code {
  background: var(--color-background-elevated);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-primary-light);
  border: 1px solid var(--color-border);
}

#content pre {
  background: var(--color-background-elevated);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: var(--space-2xl) 0;
  border: 1px solid var(--color-border);
}

#content pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: var(--font-size-sm);
}

#content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--space-xl);
  margin: var(--space-2xl) 0;
  color: var(--color-text-secondary);
  font-style: italic;
  background: rgba(92, 255, 228, 0.03);
  padding: var(--space-xl);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

#content ul, #content ol {
  margin: var(--space-xl) 0;
  padding-left: var(--space-2xl);
  color: var(--color-text-secondary);
}

#content li {
  margin-bottom: var(--space-md);
  line-height: var(--line-height-relaxed);
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.category-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: rgba(92, 255, 228, 0.1);
  border: 1px solid rgba(92, 255, 228, 0.3);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
}

.category-tag:hover {
  background: rgba(92, 255, 228, 0.2);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* Related Articles */
.related-articles {
  margin-top: var(--space-5xl);
  padding-top: var(--space-3xl);
  border-top: 1px solid var(--color-divider);
}

.related-articles h3 {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.related-card {
  background: var(--color-background-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--color-primary);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(92, 255, 228, 0.15);
}

.related-card h4 {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  transition: color var(--transition-base);
}

.related-card:hover h4 {
  color: var(--color-primary);
}

.related-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

/* ================================
   ABOUT PAGE
   ================================ */

.about-section {
  max-width: var(--container-md);
  margin: 0 auto;
  padding: var(--space-4xl) var(--space-xl);
}

.about-content {
  margin-bottom: var(--space-5xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--color-divider);
}

.about-content:last-child {
  border-bottom: none;
}

.about-content h2 {
  margin-bottom: var(--space-2xl);
}

.about-content h3 {
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-xl);
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

@media (max-width: 768px) {
  :root {
    --section-gap: var(--section-gap-mobile);
  }

  h1 {
    font-size: var(--font-size-4xl);
  }

  h2 {
    font-size: var(--font-size-3xl);
  }

  h3 {
    font-size: var(--font-size-2xl);
  }

  header {
    padding: var(--space-2xl) var(--space-md);
  }

  #article {
    padding: var(--space-2xl) var(--space-md);
  }

  #article-feed {
    padding: var(--space-md);
  }

  #category-buttons {
    gap: var(--space-sm);
  }

  .category-button {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
  }

  .article-card {
    padding: var(--space-xl);
  }

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

  .article-meta {
    gap: var(--space-md);
  }

  footer {
    flex-direction: column;
    padding: var(--space-2xl) var(--space-md);
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

  p, a {
    font-size: var(--font-size-base);
  }

  #site-title {
    font-size: var(--font-size-lg);
  }

  .article-card {
    padding: var(--space-lg);
  }
}

/* ================================
   ANIMATIONS
   ================================ */

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

@keyframes slideIn {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes glow {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes twinkle {
  0%, 100% {
    opacity: 0.4;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.2);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.slide-in {
  animation: slideIn var(--transition-slow) ease-out;
}

/* ================================
   UTILITY CLASSES
   ================================ */

.container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container-sm {
  max-width: var(--container-sm);
}

.container-md {
  max-width: var(--container-md);
}

.container-lg {
  max-width: var(--container-lg);
}

.text-center {
  text-align: center;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass {
  background: var(--color-background-card);
  border: 1px solid var(--color-border);
}

/* Disable global link underline effect */
.no-link-underline::after {
  display: none !important;
  content: none !important;
}

/* Visually hidden (for accessibility) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Homepage specific styles */
.article-card-link {
  text-decoration: none;
  display: block;
}

.card-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.article-categories {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.category-tag-mini {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(92, 255, 228, 0.08);
  border: 1px solid rgba(92, 255, 228, 0.2);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
}

.article-card:hover .category-tag-mini {
  background: rgba(92, 255, 228, 0.15);
  border-color: var(--color-primary);
}

.card-divider {
  width: 80px;
  height: 2px;
  background: var(--gradient-primary);
  margin-bottom: var(--space-sm);
  border-radius: var(--radius-full);
  opacity: 0.5;
  transition: all var(--transition-base);
}

.article-card:hover .card-divider {
  width: 120px;
  opacity: 1;
}

.card-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-lg);
}

.no-articles {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-5xl) var(--space-xl);
  text-align: center;
}

.no-articles-icon {
  font-size: var(--font-size-6xl);
  color: var(--color-primary);
  opacity: 0.3;
  margin-bottom: var(--space-xl);
  animation: pulse 2s ease-in-out infinite;
}

.no-articles p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2xl);
}

.load-more-container {
  display: flex;
  justify-content: center;
  padding-bottom: var(--space-4xl);
}

.load-more-button {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background: var(--color-background-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.load-more-button:hover {
  color: #5cffe4;
  background: rgba(92, 255, 228, 0.1);
  border-color: #5cffe4;
  transform: translateY(-2px);
}

.load-more-button:active {
  transform: translateY(0);
}

@media (max-width: 768px) {
  .card-header {
    gap: var(--space-sm);
  }

  .category-tag-mini {
    font-size: 0.625rem;
    padding: 2px var(--space-sm);
  }

  .card-divider {
    width: 60px;
  }

  .article-card:hover .card-divider {
    width: 80px;
  }
}

/* ================================
   BACK TO TOP BUTTON
   ================================ */

.back-to-top {
  position: fixed;
  bottom: var(--space-2xl);
  right: var(--space-2xl);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-background-card);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary);
  color: var(--color-background);
  transform: translateY(-4px);
}

.back-to-top.visible:hover {
  transform: translateY(-4px);
}

.back-to-top:active {
  transform: translateY(-2px);
}

.back-to-top svg {
  transition: transform var(--transition-base);
}

.back-to-top:hover svg {
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .back-to-top {
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 40px;
    height: 40px;
  }
}