.panel-container {
  font-family: system-ui, -apple-system, sans-serif;
  background: white;
  border-radius: 24px;
  padding: 24px;
  width: 100%;
  max-width: 500px;
  margin: 0 auto 32px auto;
  box-shadow:
    rgba(0, 0, 0, 0.1) 0px 4px 6px -1px,
    rgba(0, 0, 0, 0.1) 0px 2px 4px -2px;
  view-transition-name: panel-container;
  box-sizing: border-box;
}

.panel-container .panel-list-item:nth-child(1) {
  margin-bottom: -16%;
  text-decoration: none
}

.panel-container .panel-list-item:nth-child(2) {
  margin-bottom: -16%;
  transform: scale(0.95);
  text-decoration: none
}

.panel-container .panel-list-item:nth-child(3) {
  transform: scale(0.9);
  text-decoration: none
}

.panel-container .panel-hide {
  display: none;
}

.panel-container.expanded .panel-list-item:nth-child(1),
.panel-container.expanded .panel-list-item:nth-child(2) {
  margin-bottom: 0;
  transform: scale(1);
}

.panel-container.expanded .panel-list-item:nth-child(3) {
  transform: scale(1);
}

.panel-container.expanded .panel-show {
  display: none;
}

.panel-container.expanded .panel-hide {
  display: block;
}

.panel-container.expanded .panel-toggle-btn svg {
  transform: rotate(180deg);
  transition: transform 0.6s;
}

.panel-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  view-transition-name: panel-list;
}

.panel-list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: white;
  border-radius: 16px;
  border: 1px solid #e4e4e7;
  cursor: pointer;
  box-shadow:
    rgba(0, 0, 0, 0.1) 0px 4px 6px -1px,
    rgba(0, 0, 0, 0.1) 0px 2px 4px -2px;
  text-decoration: none;
  color: inherit;
}

.panel-list-item:nth-child(1) {
  view-transition-name: list-item-1;
  z-index: 2;
}

.panel-list-item:nth-child(2) {
  view-transition-name: list-item-2;
  z-index: 1;
}

.panel-list-item:nth-child(3) {
  view-transition-name: list-item-3;
  z-index: 0;
}

.panel-icon {
  width: 48px;
  height: 48px;
  background: #18181b;
  border-radius: 12px;
  display: grid;
  place-items: center;
}

.panel-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.panel-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.panel-title {
  font-size: 16px;
  font-weight: 500;
  color: #18181b;
}

.panel-subtitle {
  font-size: 14px;
  color: #71717a;
}

.panel-date {
  font-size: 14px;
  color: #71717a;
  text-align: right;
}

.panel-date a {
  color: #71717a;
  text-decoration: none;
}

.panel-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  margin: 8px auto 0 auto;
  width: 140px;
  background: none;
  color: #71717a;
  border: 1px solid #e4e4e7;
  border-radius: 24px;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  view-transition-name: show-hide-btn;
}

.panel-toggle-btn span {
  display: inline-block;
  text-align: center;
  width: fit-content;
}

.panel-toggle-btn svg {
  transition: transform 0.3s;
  view-transition-name: show-hide-btn-icon;
}

.panel-show,
.panel-hide {
  width: fit-content;
  view-transition-name: button-label;
}

@media (max-width: 600px) {
  .panel-container {
    width: 100%;
    padding: 20px;
    border-radius: 16px;
  }

  .panel-container .panel-list-item:nth-child(1),
  .panel-container .panel-list-item:nth-child(2),
  .panel-container .panel-list-item:nth-child(3) {
    flex-direction: row;
    align-items: flex-start;
    gap: 10px;
    padding: 16px;
  }

  .panel-container .panel-list-item:nth-child(1) {
    margin-bottom: -16%;
    transform: scale(1);
    text-decoration: none
  }

  .panel-container .panel-list-item:nth-child(2) {
    margin-bottom: -16%;
    transform: scale(0.95);
    text-decoration: none
  }

  .panel-container .panel-list-item:nth-child(3) {
    transform: scale(0.9);
    text-decoration: none
  }

  .panel-icon {
    width: 36px;
    height: 36px;
  }

  .panel-icon svg {
    width: 18px;
    height: 18px;
  }

  .panel-title {
    font-size: 14.5px;
  }

  .panel-subtitle {
    font-size: 12.5px;
  }

  .panel-date {
    font-size: 12.5px;
    padding-top: 4px;
  }

  .panel-date a {
    font-size: 12.5px;
    text-decoration: none;
  }

  .panel-toggle-btn {
    width: 100%;
    font-size: 13px;
    padding: 10px 16px;
    margin-top: 10px; /* collapsed default */
  }

  .panel-container.expanded .panel-toggle-btn {
    margin-top: 18px; /* more room when expanded */
  }
}