* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  background: #f9f9f9;
  color: #333;
}
#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}
.portfolio-header {
  text-align: center;
  margin-bottom: 2rem;
}
.portfolio-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #2c3e50;
}
.portfolio-header .subtitle {
  font-size: 1.2rem;
  color: #555;
  margin-bottom: 0.25rem;
}
.portfolio-header .meta {
  font-size: 0.9rem;
  color: #777;
}
.assignments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.assignment-card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}
.assignment-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
  text-decoration: none;
}
.image-wrapper {
  width: 100%;
  padding-top: 56.25%;
  position: relative;
  overflow: hidden;
}
.image-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
}
.card-content {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.card-content h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: #2c3e50;
}
.card-content .description {
  font-size: 1rem;
  color: #444;
}
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-content {
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  max-width: 80%;
  text-align: center;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}
.modal-content img {
  max-width: 100%;
  margin-top: 1rem;
}
.modal-text {
  margin-top: 0.5rem;
  font-size: 1rem;
  color: #555;
}
.assignment-card,
.image-wrapper {
  touch-action: none;
}