body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  background-color: #f0f2f5;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
  box-sizing: border-box;
}

.page-header {
  background-color: #fff;
  padding: 10px 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
}

.page-header h1 {
  font-size: 20px;
  margin: 0;
  margin-left: 15px;
}

.menu-btn {
  font-size: 24px;
  background: none;
  border: none;
  cursor: pointer;
}

.description {
  color: #666;
  text-align: center;
  margin-bottom: 20px;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 15px;
}

.grid-item {
  background-color: #fff;
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  text-decoration: none;
  color: #333;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
  animation: slideInUp 0.6s ease forwards;
}

@keyframes slideInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.grid-item:nth-child(1) { animation-delay: 0.1s; }
.grid-item:nth-child(2) { animation-delay: 0.2s; }
.grid-item:nth-child(3) { animation-delay: 0.3s; }
.grid-item:nth-child(4) { animation-delay: 0.4s; }
.grid-item:nth-child(5) { animation-delay: 0.5s; }
.grid-item:nth-child(6) { animation-delay: 0.6s; }
.grid-item:nth-child(7) { animation-delay: 0.7s; }
.grid-item:nth-child(8) { animation-delay: 0.8s; }
.grid-item:nth-child(9) { animation-delay: 0.9s; }

.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.card {
  background-color: #fff;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.timeslot-section {
  margin-bottom: 30px;
}

.timeslot-section h2 {
  border-bottom: 2px solid #007bff;
  padding-bottom: 5px;
  margin-bottom: 15px;
}

.modal {
  display: flex;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.4);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  visibility: hidden;
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: #fefefe;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
  max-width: 500px;
  border-radius: 8px;
  text-align: center;
  transform: scale(0.8);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal.show .modal-content {
  transform: scale(1);
}

.spinner {
  border: 5px solid #f3f3f3;
  border-top: 5px solid #3498db;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading {
  text-align: center;
  padding: 40px;
  color: #666;
}

/* システムロックゲート */
#system-lock-gate {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: rgba(0,0,0,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: all;
}

#system-lock-gate > div {
  background: #fff;
  padding: 24px;
  border-radius: 8px;
  max-width: 360px;
  width: 90%;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,.3);
}

#system-lock-gate h3 {
  margin: 0 0 12px 0;
  color: #333;
  font-size: 18px;
  font-weight: 600;
}

#system-lock-gate p {
  margin: 0 0 16px 0;
  color: #555;
  font-size: 14px;
  line-height: 1.4;
}

/* 同期中モーダル */
#sync-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
}

#sync-modal .modal-content {
  background: white;
  padding: 30px;
  border-radius: 8px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

#sync-modal h3 {
  margin: 0 0 15px 0;
  color: #333;
  font-size: 18px;
}

#sync-modal p {
  margin: 0;
  color: #666;
  font-size: 14px;
  line-height: 1.4;
}

#sync-modal .spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #007bff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* URL管理システム情報表示 */
.url-info {
  position: fixed;
  top: 10px;
  right: 10px;
  background-color: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.url-info-content {
  display: flex;
  align-items: center;
  gap: 8px;
}

.url-info-content span {
  font-weight: 500;
}

#url-refresh-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  cursor: pointer;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all 0.2s ease;
  width: auto;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#url-refresh-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

#url-refresh-btn:active {
  transform: translateY(0);
  background-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}