body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f8fafc;
  color: #111827;
}

h1 {
  text-align: center;
  font-weight: 700;
  margin-bottom: 30px;
}

.usa-btn {
  cursor: pointer;
  font-weight: 600;
  transition: 0.2s;
  border: none;
  padding: 8px 16px;
  border-radius: 20px;
}

.add-btn {
  background: linear-gradient(90deg,#2563eb,#1e4bb8);
  color: #fff;
}

.add-btn:hover {
  transform: translateY(-1px);
}

.remove-btn {
  background: none;
  color: #ef4444;
  font-weight: bold;
  font-size: 18px;
  cursor: pointer;
}

.usa-semester {
  background: #fff;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  position: relative;
}

.usa-semester h2 {
  margin-top: 0;
}

.semester-body {
  margin-top: 10px;
}

.course-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  background: #f9fafb;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  margin-bottom: 12px;
  align-items: center;
  position: relative;
}

.col-name, .col-grade, .col-credits, .col-type {
  flex: 1;
  min-width: 120px;
}

input, select {
  width: 100%;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
}

.results {
  background: #ffffff;
  padding: 25px;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  max-width: 400px;
  margin: 30px auto 0;
  text-align: center;
}

.results h2 {
  margin-top: 0;
}

/* Small remove course button */
.remove-course-btn {
  background: #ef4444;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  font-size: 14px;
  line-height: 18px;
  text-align: center;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
}

.remove-course-btn:hover {
  background: #c53030;
}

/* Mobile adjustments */
@media (max-width: 600px) {
  .course-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    position: relative;
  }

  .col-name, .col-grade, .col-credits, .col-type {
    flex: unset;
    min-width: unset;
  }

  .remove-course-btn {
    position: absolute;
    top: 6px;
    right: 6px;
  }
}