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

:root {
  --primary-color: #0066ff;
  --primary-hover: #0052cc;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --background: #f8f9fa;
  --surface: #ffffff;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --border: #dee2e6;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

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

/* Header */
.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 60px 20px;
  margin-bottom: 40px;
  border-radius: 0 0 20px 20px;
  box-shadow: var(--shadow-lg);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
}

.header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Main Content */
.main {
  min-height: 60vh;
  position: relative;
}

/* Loading */
.loading {
  text-align: center;
  padding: 60px 20px;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

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

/* Error */
.error {
  text-align: center;
  padding: 60px 20px;
  background: var(--surface);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.error-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.error p {
  color: var(--danger-color);
  margin-bottom: 20px;
  font-size: 1.1rem;
}

/* Posts Container */
.posts-container {
  background: var(--surface);
  border-radius: 12px;
  padding: 30px;
  box-shadow: var(--shadow);
}

.posts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
}

.posts-header h2 {
  font-size: 1.8rem;
  color: var(--text-primary);
}

/* Posts List */
.posts-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

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

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.post-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 16px;
}

.post-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.post-tag {
  display: inline-block;
  background: #e7f3ff;
  color: var(--primary-color);
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 0.85rem;
  font-weight: 500;
}

.post-date {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Buttons */
.btn {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
}

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

.btn-secondary:hover {
  background: #5a6268;
}

.btn-refresh {
  background: white;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

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

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal-content {
  background: var(--surface);
  border-radius: 16px;
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 30px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 1.5rem;
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.3s ease;
  padding: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

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

.modal-body {
  padding: 30px;
  overflow-y: auto;
  flex: 1;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.post-image-container {
  margin-bottom: 24px;
}

.post-image-container img {
  width: 100%;
  border-radius: 12px;
}

.markdown-content {
  line-height: 1.8;
  color: var(--text-primary);
}

.markdown-content h1 {
  font-size: 2rem;
  margin: 24px 0 16px;
}

.markdown-content h2 {
  font-size: 1.6rem;
  margin: 20px 0 12px;
}

.markdown-content h3 {
  font-size: 1.3rem;
  margin: 16px 0 8px;
}

.markdown-content p {
  margin-bottom: 16px;
}

.markdown-content ul, .markdown-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.markdown-content code {
  background: var(--background);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
}

.markdown-content pre {
  background: #282c34;
  color: #abb2bf;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.markdown-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.markdown-content blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: 16px;
  margin: 16px 0;
  color: var(--text-secondary);
}

.modal-footer {
  padding: 20px 30px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--surface);
  border-radius: 12px;
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 320px;
  z-index: 2000;
  animation: slideInRight 0.4s ease, slideOutRight 0.4s ease 2.6s;
}

@keyframes slideInRight {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.toast-icon {
  font-size: 2rem;
  animation: scaleIn 0.4s ease;
}

@keyframes scaleIn {
  from {
    transform: scale(0);
  }
  to {
    transform: scale(1);
  }
}

.toast-content h3 {
  color: var(--success-color);
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.toast-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 20px;
  opacity: 0.5;
}

.empty-state p {
  font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .posts-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .posts-list {
    grid-template-columns: 1fr;
  }

  .modal-content {
    max-width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }

  .toast {
    left: 20px;
    right: 20px;
    bottom: 20px;
    min-width: unset;
  }
}