* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
    sans-serif;
  background-color: #f5f5f8;
  color: #333;
}

header {
  background-color: #fdf2f2;
  border-bottom: 1px solid #e5c3c3;
  padding: 16px 20px;
}

header h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
}

header p {
  margin: 4px 0;
  font-size: 0.9rem;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 12px 32px;
}

.intro {
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: #555;
}

.card-section {
  margin-top: 12px;
}

.card-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* 画面幅に応じて 1 → 2 → 3 列 */
@media (min-width: 640px) {
  .card-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

article.card {
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  padding: 12px 16px 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 140px;
}

.card-header {
  margin-bottom: 8px;
}

.card-maker {
  font-size: 0.75rem;
  font-weight: bold;
  color: #777;
  display: inline-block;
  margin-bottom: 4px;
}

.card-name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
}

.card-release {
  margin: 4px 0 6px;
  font-size: 0.85rem;
  color: #555;
}

.card-elapsed-label {
  margin: 4px 0 0;
  font-size: 0.8rem;
  color: #777;
}

.card-elapsed {
  margin: 2px 0 0;
  font-size: 1.2rem;
  font-weight: bold;
  color: #c0392b;
}

.card-note {
  margin-top: 8px;
  font-size: 0.75rem;
  color: #777;
}

footer {
  background-color: #e9e9ee;
  border-top: 1px solid #d2d2dd;
  margin-top: 24px;
  padding: 16px 20px 24px;
  font-size: 0.8rem;
}

footer p {
  margin: 4px 0;
}

a {
  color: #0066cc;
}

.sort-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
  align-items: center;
}

.sort-label {
  font-size: 0.8rem;
  color: #555;
}

.sort-button {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid #ccc;
  background-color: #ffffff;
  cursor: pointer;
}

.sort-button.active {
  border-color: #c0392b;
  color: #c0392b;
  font-weight: 600;
}

.sort-button:focus {
  outline: none;
}