/* =========================================================
   University Papers Finder Pro - Filter Style
   ========================================================= */

.upf-pro-filter-wrapper {
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  padding: 25px 30px;
  margin-bottom: 40px;
  border: 1px solid #eef0f2;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu,
    Cantarell, "Helvetica Neue", sans-serif;
}

.upf-form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
}

.upf-form-group {
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
}

.upf-form-group label {
  font-size: 13px;
  font-weight: 600;
  color: #4b5563;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.upf-select {
  width: 100%;
  padding: 12px 15px;
  font-size: 14px;
  color: #374151;
  background-color: #f9fafb;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  appearance: auto;
  transition: all 0.2s ease-in-out;
  cursor: pointer;
  outline: none;
}

.upf-select:focus {
  border-color: #3b82f6;
  background-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.upf-submit-group {
  flex: 0 1 auto;
  min-width: 150px;
}

.upf-search-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #2563eb;
  color: #ffffff;
  border: none;
  padding: 13px 20px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition:
    background-color 0.3s ease,
    transform 0.1s ease;
}

.upf-search-btn:hover {
  background: #1d4ed8;
}

.upf-search-btn:active {
  transform: scale(0.98);
}

/* =========================================================
   Results Card Grid Style
   ========================================================= */
.upf-results-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .upf-form-row {
    flex-direction: column;
    align-items: stretch;
  }
  .upf-submit-group {
    margin-top: 10px;
  }
}