.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: #f5f5f5;
}

/* Header Styles */
.header {
  background: white;
  border-bottom: 1px solid #e0e0e0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #ff2442;
  margin: 0;
}

.search-bar {
  display: flex;
  align-items: center;
  background: #f8f8f8;
  border-radius: 20px;
  padding: 0.5rem 1rem;
  flex: 1;
  max-width: 400px;
  margin: 0 2rem;
}

.search-bar input {
  border: none;
  background: none;
  outline: none;
  margin-left: 0.5rem;
  width: 100%;
}

.header-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.header-actions svg {
  cursor: pointer;
  color: #666;
}

/* Main Content */
.main-content {
  flex: 1;
  padding-top: 80px;
  padding-bottom: 80px;
}

.posts-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* Post Card Styles */
.post-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
  cursor: pointer;
}

.post-card:hover {
  transform: translateY(-2px);
}

.post-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.post-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.post-content {
  padding: 1rem;
}

.post-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: #333;
  line-height: 1.3;
}

.post-description {
  font-size: 0.9rem;
  color: #666;
  margin: 0 0 1rem 0;
  line-height: 1.4;
}

.post-author {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  margin-right: 0.5rem;
}

.author-name {
  font-size: 0.8rem;
  color: #666;
}

/* Post Actions */
.post-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: none;
  color: #666;
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.3rem;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.action-btn:hover {
  background: #f0f0f0;
}

.action-btn.liked {
  color: #ff4757;
}

.action-btn.saved {
  color: #ffa502;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid #e0e0e0;
  display: flex;
  justify-content: space-around;
  padding: 0.5rem 0;
  z-index: 100;
}

.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: none;
  border: none;
  color: #999;
  cursor: pointer;
  padding: 0.5rem;
  transition: color 0.2s ease;
}

.nav-btn.active {
  color: #ff2442;
}

.nav-btn span {
  font-size: 0.7rem;
  margin-top: 0.2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    padding: 1rem;
  }
  
  .search-bar {
    margin: 0 1rem;
  }
  
  .posts-container {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    padding: 0.5rem;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .posts-container {
    grid-template-columns: repeat(2, 1fr);
  }
}