* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f6f3ee;
  color: #1f2933;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.portal {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 40px 20px;
}

.portal-header {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: #4a6f65;
  font-size: 0.85rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 4rem);
  letter-spacing: 0;
}

.lead {
  max-width: 620px;
  margin: 12px 0 0;
  color: #52616f;
  line-height: 1.8;
}

.game-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.game-tile {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 12px 14px;
  align-items: center;
  min-height: 128px;
  padding: 18px;
  border: 1px solid #d6d0c6;
  border-radius: 8px;
  background: #fffdfa;
  color: inherit;
  text-decoration: none;
}

.game-tile:focus-visible,
.game-tile:hover {
  border-color: #8a6f3f;
  outline: 3px solid rgba(138, 111, 63, 0.18);
}

.game-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 64px;
}

/* AI将棋: 将棋の駒型 */
.icon-shogi {
  clip-path: polygon(50% 0, 88% 18%, 80% 100%, 20% 100%, 12% 18%);
  background: #e5bf72;
  border: 1px solid #8a6f3f;
  font-weight: 800;
  font-size: 1.4rem;
}

/* AIなぞラボ: 司会者キャラの丸アイコン */
img.icon-nazo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  background: #3f2c6b;
  border: 2px solid #6b56b0;
  box-shadow: 0 0 0 2px #f8e58a inset;
}

.tile-nazo:focus-visible,
.tile-nazo:hover {
  border-color: #6b56b0;
  outline: 3px solid rgba(107, 86, 176, 0.22);
}

.game-title {
  font-size: 1.2rem;
  font-weight: 800;
}

.game-copy {
  grid-column: 2;
  color: #52616f;
  line-height: 1.6;
}