.stampbook {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  text-align: center;
  color: #1f3f68;
}

.progress-box {
  max-width: 500px;
  margin: 20px auto 30px;
  text-align: center;
  font-weight: bold;
}

.progress-bar {
  height: 14px;
  background: #ddd;
  border-radius: 20px;
  overflow: hidden;
  margin-top: 8px;
}

#progress-fill {
  height: 100%;
  width: 0%;
  background: #c82020;
}

.stamp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
}

.stamp-card {
  display: block;
  padding: 18px;
  min-height: 230px;
  text-align: center;
  text-decoration: none;
  color: #333;
  background: #fffdf8;
  border: 1px solid #e2d5bd;
  border-radius: 14px;
}

.stamp-card:hover {
  background: #fff7e6;
}

.stamp-image-wrap {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stamp-image-wrap img {
  max-width: 130px;
  max-height: 130px;
}

.stamp-card.empty .stamp-image-wrap::before {
  content: "未訪問";
  width: 120px;
  height: 120px;
  border: 2px dashed #c8c0b0;
  border-radius: 50%;
  color: #aaa;
  display: flex;
  align-items: center;
  justify-content: center;
}

.station-name {
  font-size: 18px;
  font-weight: bold;
  margin-top: 8px;
}

.pref-name {
  font-size: 14px;
  color: #777;
}

.stamp-date {
  margin-top: 6px;
  font-size: 13px;
  color: #b02020;
}

#stamp-reset-button {
  display: block;
  margin: 12px auto 24px;
  padding: 10px 22px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
}