:root {
  --primary-color: #5e72e4;
  --secondary-color: #f7fafc;
  --text-color: #2d3748;
  --light-gray: #e2e8f0;
  --dark-gray: #4a5568;
  --border-radius: 8px;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-family);
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-color);
  background-color: #f8f9fa;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

header {
  background-color: var(--primary-color);
  color: white;
  padding: 40px 0;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  font-weight: 600;
}

.filters {
  margin: 30px 0;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

#search {
  padding: 12px 15px;
  border: 1px solid var(--light-gray);
  border-radius: var(--border-radius);
  font-size: 1rem;
  width: 100%;
  font-family: var(--font-family);
}

.tags-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-button {
  background-color: var(--secondary-color);
  border: 1px solid var(--light-gray);
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: normal;
  font-family: var(--font-family);
}

.tag-button:hover {
  background-color: var(--light-gray);
}

.tag-button.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 25px;
  margin-bottom: 50px;
}

.card {
  background-color: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: transform 0.3s;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card:hover {
  transform: translateY(-5px);
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 5px;
  font-family: var(--font-family);
}

.card-function {
  color: var(--dark-gray);
  font-size: 0.9rem;
  margin-bottom: 10px;
  font-weight: normal;
  font-family: var(--font-family);
}

.card-description {
  margin-bottom: 15px;
  color: var(--text-color);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-weight: normal;
  font-size: 0.95rem;
  font-family: var(--font-family);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 15px;
}

.card-tag {
  background-color: var(--secondary-color);
  border-radius: 15px;
  padding: 4px 10px;
  font-size: 0.8rem;
  color: var(--dark-gray);
  font-weight: normal;
  font-family: var(--font-family);
}

.card-link {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 8px 15px;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: normal;
  transition: background-color 0.2s;
  margin-top: auto;
  text-align: center;
  width: 100%;
  font-family: var(--font-family);
}

.card-link:hover {
  background-color: #4c5ec2;
}

.loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 50px;
  font-size: 1.2rem;
  color: var(--dark-gray);
  font-family: var(--font-family);
}

footer {
  background-color: var(--secondary-color);
  padding: 20px 0;
  text-align: center;
  border-top: 1px solid var(--light-gray);
  margin-top: 30px;
  font-family: var(--font-family);
}

@media (max-width: 768px) {
  .cards-container {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  header h1 {
    font-size: 2rem;
  }
}

@media (min-width: 769px) {
  .cards-container {
    grid-template-columns: repeat(4, 1fr);
  }
}