/* seminar_archive_detail.html から切り出したスタイル。
   元は <style> タグ 1 個。中身は変更していない。 */

.back-link {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 0.82rem;
}
.archive-title {
  font-size: 1.15rem;
  line-height: 1.5;
  margin: 0 0 1.25rem;
}
.archive-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 768px) {
  .archive-grid { grid-template-columns: 1fr; }
}

/* Vimeo埋め込みエリア */
.video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: #0d1117;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.video-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.video-placeholder {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  gap: 0.75rem;
}
.video-placeholder svg { opacity: 0.4; }
.video-placeholder p { font-size: 0.85rem; margin: 0; }

/* 学びのメモのフォーム */
.note-form-card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.note-form-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #f3f4f6;
  color: #1f2937;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.note-form-card .cat-badge {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.68rem;
  font-weight: 600;
  background: #dbeafe;
  color: #1e40af;
}
.note-form-card label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: #374151;
  margin-bottom: 0.25rem;
}
.note-form-card input,
.note-form-card textarea {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.85rem;
  background: #fafafa;
  box-sizing: border-box;
  margin-bottom: 0.85rem;
}
.note-form-card input:focus,
.note-form-card textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
}
.note-form-card textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.7;
}
.note-form-actions {
  display: flex;
  justify-content: flex-end;
}
.note-form-actions button {
  padding: 0.5rem 1.5rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}
.note-form-actions button:hover { opacity: 0.85; }
.note-success {
  background: #dcfce7;
  border: 1px solid #86efac;
  color: #166534;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.85rem;
}

/* 右: セミナー概要 */
.archive-content {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  position: sticky;
  top: 1rem;
}
.archive-content h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #f3f4f6;
  color: #1f2937;
}
.archive-content .content {
  font-size: 0.78rem;
  line-height: 1.7;
  color: #374151;
  max-height: 70vh;
  overflow-y: auto;
}
.archive-content .content img {
  max-width: 100%;
  border-radius: 8px;
}