/* ---------- Radiology layout ---------- */
.rad-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}
.rad-intro {
  text-align: center;
  margin-bottom: 24px;
}
.rad-intro h1 {
  font-size: 30px;
  color: var(--primary);
  margin: 8px 0 12px;
}
.rad-intro .lead {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
  max-width: 700px;
  margin: 0 auto 20px;
}

/* search + filter row */
.rad-filter {
  display: flex;
  gap: 12px;
  align-items: center;
  max-width: 720px;
  margin: 0 auto 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.rad-filter input[type="search"] {
  flex: 1;
  min-width: 220px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
}
.rad-filter input[type="search"]:focus {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
}
.quiz-mode-switch {
  background: var(--bg-soft);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* category pills */
.cat-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin: 16px 0;
}
.cat-pill {
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text);
  transition: all .15s;
  font-family: inherit;
}
.cat-pill:hover {
  border-color: var(--primary);
  background: var(--bg-soft);
}
.cat-pill.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  font-weight: 600;
}
.cat-pill .count {
  margin-left: 4px;
  font-size: 11px;
  opacity: 0.7;
}

.rad-stats {
  margin: 12px 0;
  font-size: 13px;
  color: var(--text-muted);
}

/* slide grid */
.rad-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 16px;
}
.slide-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: all .15s;
  display: flex;
  flex-direction: column;
}
.slide-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.slide-card .thumb {
  background: #1a1a1a;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.slide-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.slide-card .thumb.no-img {
  background: linear-gradient(135deg, var(--bg-soft), var(--bg-card));
  color: var(--text-muted);
  font-size: 36px;
}
.slide-card .info {
  padding: 10px 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.slide-card .num {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.4px;
}
.slide-card .ttl {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  margin: 4px 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.slide-card .badge-row {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}
.slide-card .mini-badge {
  font-size: 10px;
  background: var(--bg-soft);
  color: var(--text-muted);
  padding: 1px 6px;
  border-radius: 6px;
}
.slide-card .card-dx {
  display: inline-block;
  margin: 4px 0;
  font-size: 11px;
  background: #fde6e6;
  color: #c00;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid #f5b5b5;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- Viewer (modal) ---------- */
.rad-viewer[hidden] { display: none !important; }
.rad-viewer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.viewer-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.85);
}
.viewer-content {
  position: relative;
  background: var(--bg-card);
  border-radius: 12px;
  max-width: 1200px;
  width: 100%;
  max-height: 90vh;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  overflow: hidden;
  z-index: 1;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.viewer-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  font-size: 20px;
  cursor: pointer;
  z-index: 10;
}
.viewer-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  width: 44px;
  height: 60px;
  font-size: 32px;
  cursor: pointer;
  z-index: 10;
  border-radius: 4px;
}
.viewer-nav.prev { left: 4px; }
.viewer-nav.next { right: 4px; }
.viewer-nav:hover { background: rgba(0,0,0,0.8); }
.viewer-nav:disabled { opacity: 0.3; cursor: not-allowed; }

.viewer-image-wrap {
  background: #0a0a0a;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 400px;
}
.viewer-image-wrap img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}
.viewer-no-img {
  color: #fff;
  text-align: center;
}
.viewer-no-img span { font-size: 64px; }
.viewer-no-img p { color: #ddd; margin-top: 8px; }

.viewer-text {
  padding: 24px;
  overflow-y: auto;
  max-height: 90vh;
}
.viewer-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--text-muted);
}
.viewer-idx {
  background: var(--primary);
  color: #fff;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
}
.viewer-cats {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.viewer-cats .mini-badge {
  background: var(--bg-soft);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 8px;
  font-size: 11px;
}
.viewer-text h2 {
  margin: 4px 0 16px;
  color: var(--primary);
  font-size: 20px;
  line-height: 1.35;
}
.viewer-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  word-break: break-word;
}
.viewer-body.hidden {
  filter: blur(8px);
  user-select: none;
  pointer-events: none;
}
/* --- markdown-like 가독성 클래스 --- */
.viewer-body .md-para,
.viewer-notes .md-para {
  background: var(--bg-soft);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 0 0 10px;
  border-left: 3px solid #d0dbe6;
}
.viewer-body .md-para + .md-para,
.viewer-notes .md-para + .md-para {
  margin-top: 8px;
}
.viewer-body .md-line,
.viewer-notes .md-line {
  margin: 0 0 4px;
}
.viewer-body .md-line:last-child,
.viewer-notes .md-line:last-child {
  margin-bottom: 0;
}
.viewer-body .md-subhead,
.viewer-notes .md-subhead {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--primary);
  margin: 4px 0 6px;
  letter-spacing: -0.2px;
}
.viewer-body .md-label,
.viewer-notes .md-label {
  color: var(--primary);
  font-weight: 700;
}
.viewer-body .md-sep,
.viewer-notes .md-sep {
  color: var(--text-muted);
  margin: 0 2px 0 0;
}
.viewer-body .md-list,
.viewer-notes .md-list {
  margin: 6px 0 6px 4px;
  padding-left: 22px;
}
.viewer-body .md-list li,
.viewer-notes .md-list li {
  margin: 3px 0;
  padding-left: 2px;
}
.viewer-body ol.md-list,
.viewer-notes ol.md-list {
  list-style: decimal;
}
.viewer-body ul.md-list,
.viewer-notes ul.md-list {
  list-style: disc;
}
.viewer-body .md-empty {
  color: var(--text-muted);
  font-style: italic;
}
/* 키워드 강조 */
.viewer-body .kw-term,
.viewer-notes .kw-term {
  background: linear-gradient(180deg, transparent 55%, #fff3a6 55%);
  color: var(--text);
  font-weight: 600;
  padding: 0 1px;
  border-radius: 2px;
}
.viewer-body .kw-ro,
.viewer-notes .kw-ro {
  display: inline-block;
  background: #fde6e6;
  color: #c00;
  font-weight: 700;
  font-size: 0.85em;
  padding: 1px 6px;
  margin: 0 2px;
  border-radius: 10px;
  letter-spacing: 0.3px;
}
.reveal-btn {
  margin-top: 12px;
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
}
.reveal-btn:hover { background: #a00; }

.viewer-notes {
  margin-top: 16px;
  padding: 12px;
  background: var(--bg-soft);
  border-left: 4px solid var(--primary-light);
  border-radius: 4px;
  font-size: 13px;
}
.viewer-notes summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--primary);
}
.viewer-notes summary::-webkit-details-marker { color: var(--primary); }
.viewer-notes > div {
  margin-top: 10px;
  line-height: 1.7;
  color: var(--text);
  font-size: 14px;
}
.viewer-notes .md-para {
  background: #fffdf3;
  border-left-color: #e6cf68;
}

/* mode tabs (study / quiz) */
.rad-mode-tabs {
  display: inline-flex;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 4px;
  margin: 0 auto 18px;
  gap: 2px;
}
.mode-tab {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: all .15s;
}
.mode-tab:hover { color: var(--text); }
.mode-tab.active {
  background: var(--primary);
  color: #fff;
}

/* source filter */
.source-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin: 0 0 8px;
}
.source-pill {
  padding: 5px 11px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  font-size: 12px;
  cursor: pointer;
  color: var(--text-muted);
  font-family: inherit;
}
.source-pill.active {
  background: var(--bg-soft);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}
.source-pill .count {
  margin-left: 4px;
  opacity: 0.7;
}

/* multi-image badge on thumbnail */
.slide-card .thumb .multi-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  font-size: 10.5px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 10px;
}

/* viewer thumbnails for extra images */
.viewer-thumbs {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  padding: 4px 8px;
  background: rgba(0,0,0,0.5);
  border-radius: 8px;
  max-width: 90%;
  overflow-x: auto;
}
.viewer-thumbs .vthumb {
  background: none;
  border: 2px solid transparent;
  padding: 0;
  cursor: pointer;
  width: 48px;
  height: 36px;
  flex: 0 0 auto;
  border-radius: 4px;
  overflow: hidden;
}
.viewer-thumbs .vthumb.active { border-color: #fff; }
.viewer-thumbs .vthumb img { width: 100%; height: 100%; object-fit: cover; }

/* viewer source badge */
.viewer-source {
  background: var(--bg-soft);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
}

/* viewer tags */
.viewer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 8px;
}
.viewer-tags .tag {
  font-size: 11.5px;
  background: var(--bg-soft);
  color: var(--text-muted);
  padding: 3px 9px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.viewer-tags .tag-dx {
  background: #fde6e6;
  color: #c00;
  border-color: #f5b5b5;
  font-weight: 600;
}
.viewer-tags .tag-finding {
  background: #e6f0f9;
  color: var(--primary);
  border-color: #b7d4ea;
}

/* search highlight */
.hl { background: rgba(255, 230, 0, 0.4); padding: 0 2px; border-radius: 2px; }

/* header search button */
.header-search-btn {
  margin-left: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
}
.header-search-btn:hover { background: var(--bg-card); border-color: var(--primary); }

/* ---------- mobile ---------- */
@media (max-width: 800px) {
  .viewer-content {
    grid-template-columns: 1fr;
    grid-template-rows: 60vh auto;
    max-height: 95vh;
  }
  .viewer-image-wrap { min-height: 300px; }
  .viewer-text { padding: 16px; max-height: 35vh; }
  .rad-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
  }
  .slide-card .ttl { font-size: 12.5px; }
  .rad-intro h1 { font-size: 24px; }
  .rad-filter { flex-direction: column; }
  .rad-filter input[type="search"] { width: 100%; }
}