.portfolio_article {
  background-color: var(--nb);
  border-radius: 10px;
  border: 10px solid var(--nb);
  padding: 1rem;
  font-family: "JF-Dot-k12x10", "游ゴシック", sans-serif;
}

.project-header {
  display: block;
  text-align: center;
}

.OGP_img {
  width: 90%;
  max-width: 350px;
}

#on_service:hover {
  transform: translateY(-8px);
}

.project-title {
  margin: 0 0 0.2rem;
  font-size: 1.45rem;
  letter-spacing: 0.04em;
  line-height: 1.25;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
}

.project-rating {
  display: inline-block;
  margin: 0 0 0.9rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background-color: rgba(255, 196, 92, 0.3);
  border: 1px solid rgba(166, 118, 38, 0.35);
  font-size: 0.95rem;
  line-height: 1.4;
}

.project-rating::before {
  content: "★ ";
}

.project-details {
  margin: 0.8rem 0 1rem;
  display: grid;
  gap: 0.6rem;
}

.project-detail {
  color: var(--fg-base);
  background-color: #d8d8d8;
  border: 1px solid #b7b7b7;
  border-radius: 8px;
  overflow: hidden;
}

.project-detail summary {
  list-style: none;
  cursor: pointer;
  background-color: #6b6b6b;
  color: #ffffff;
  padding: 0.5rem 0.8rem;
  font-weight: 400;
}

.project-detail summary:hover {
  color: #ff0000;
}

.project-detail summary::-webkit-details-marker {
  display: none;
}

.project-detail summary::before {
  content: "▶ ";
}

.project-detail[open] summary::before {
  content: "▼ ";
}

.detail-panel {
  color: var(--fg-base);
  padding: 0.7rem 0.8rem;
  line-height: 1.6;
}

.detail-list {
  margin: 0;
  padding: 0;
}

.detail-list li {
  list-style: none;
  position: relative;
  padding-left: 1em;
}

.detail-list li + li {
  margin-top: 0.35em;
}

.detail-list li::before {
  content: "・";
  position: absolute;
  left: 0;
}

.project-body {
  display: flex;
  gap: 1rem;
}

.project-spec {
  flex: 1;
  min-width: 0;
  color: var(--fg-base);
  background-color: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  overflow: hidden;
}

.project-row {
  display: grid;
  grid-template-columns: 7.5em 1fr;
}

.project-row + .project-row {
  border-top: 1px dashed rgba(0, 0, 0, 0.14);
}

.project-label,
.project-value {
  margin: 0;
  color: var(--fg-base);
  padding: 0.55rem 0.75rem;
}

.project-label {
  background-color: transparent;
  color: rgba(0, 0, 0, 0.72);
  font-weight: 400;
  letter-spacing: 0.02em;
  white-space: nowrap;
}