body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  position: relative;
  flex-grow: 1;
  max-width: 75rem;
  margin: 0 auto;
  width: 100%;
  padding: 1rem;
  box-sizing: border-box;
}

.hidden {
  display: none;
}

.topbar-container {
  position: sticky;
  top: 0;
  margin: -1rem -1rem 1.5rem -1rem;
  padding: 1.25rem 1.5rem;
  background-color: var(--color-primary);
  color: var(--color-text-light);
  border-bottom: 3px solid var(--color-secondary);
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

#controls-panel h2 {
  color: var(--color-text-light);
  margin: 0 0 0.75rem 0;
  font-family: var(--font-sans);
}

.region-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.region-selector label {
  color: var(--color-text-light);
  font-family: var(--font-mono);
}

#data-info {
  margin-top: 0.75rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

#country-count {
  font-weight: bold;
}

#info-panel .progress-bar-container {
  background-color: rgba(255, 255, 255, 0.2);
  height: 6px;
  border-radius: 3px;
  margin: 0.75rem 0 0.25rem 0;
}

#load-more.progress-bar-container {
  background-color: rgba(1, 31, 91, 0.1);
  height: 6px;
  border-radius: 3px;
  margin: 1.5rem 0;
}

.error {
  color: #fff;
  background-color: var(--color-secondary);
  border-radius: 0.25rem;
  padding: 0.5rem 1rem;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
}

#countries-container {
  padding: 0.5rem 0 2rem 0;
}

#countries-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

#countries-list li {
  flex: 1 1 calc(33.333% - 1rem);
  box-sizing: border-box;
  padding: 1rem;
  background-color: var(--color-background-header);
  border: 1px solid #ddd;
  border-left: 4px solid var(--color-primary);
  border-radius: 0.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

#countries-list li:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.country-name {
  font-family: var(--font-sans);
  font-weight: bold;
  color: var(--color-primary);
  font-size: 1.15rem;
}

.country-code {
  font-family: var(--font-mono);
  color: var(--color-secondary);
  font-size: 0.9rem;
  margin-left: 0.35rem;
}

.country-capital {
  font-family: var(--font-mono);
  color: #555;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

@media (width <= 60rem) {
  #countries-list li {
    flex: 1 1 calc(50% - 1rem);
  }
}

@media (width <= 30rem) {
  .region-selector {
    flex-direction: column;
    align-items: stretch;
  }

  .region-selector select,
  .region-selector button {
    width: 100%;
  }

  #countries-list li {
    flex: 1 1 100%;
  }
}