/* reader.css — BT-ENERGY-17 */

/* Dialog/panel reset */
dialog#reader {
  border: none;
  padding: 0;
  margin: 0;
  width: 100%;
  max-width: 100%;
  height: 100%;
  max-height: 100%;
  background: var(--canvas);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

dialog#reader::backdrop {
  background: rgba(23, 58, 58, 0.4);
}

/* Toolbar */
.reader-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--terrain);
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}

/* Tabs */
.reader-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--line);
  background: var(--surface);
  flex-shrink: 0;
  overflow-x: auto;
}

.reader-tab {
  padding: 0.6rem 1rem;
  border: none;
  background: none;
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
}

.reader-tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--primary);
}

/* Panels */
.reader-panels {
  flex: 1;
  overflow-y: auto;
}

.reader-panel {
  padding: 1.25rem 1rem;
  max-width: 65ch;
  margin: 0 auto;
}

.reader-panel[hidden] { display: none; }

/* Typography */
.reader-panel h2 { font-size: clamp(1.1rem, 3vw, 1.4rem); margin: 1.5rem 0 0.5rem; }
.reader-panel h3 { font-size: clamp(1rem, 2.5vw, 1.2rem); margin: 1.25rem 0 0.4rem; }
.reader-panel p { margin: 0 0 0.9rem; line-height: 1.7; }
.reader-panel ul, .reader-panel ol { padding-left: 1.5rem; margin-bottom: 0.9rem; }
.reader-panel li { line-height: 1.6; margin-bottom: 0.3rem; }
.reader-panel blockquote { border-left: 3px solid var(--terrain); margin: 0 0 0.9rem 0; padding-left: 1rem; color: var(--muted); }
.reader-panel pre { background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 0.75rem; overflow-x: auto; font-size: 0.85rem; }
.reader-panel figure { margin: 0 0 0.9rem; }
.reader-panel figcaption { font-size: 0.8rem; color: var(--muted); }

/* Notes textarea */
.reader-notes-area {
  width: 100%;
  min-height: 200px;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  color: var(--ink);
  resize: vertical;
}

/* Overview */
.reader-subject-badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.75rem;
  background: var(--terrain);
  color: var(--ink);
}

/* Loading */
.reader-loading { color: var(--muted); font-style: italic; }
.reader-retry { background: var(--primary); color: white; border: none; padding: 0.5rem 1rem; cursor: pointer; border-radius: 3px; }

/* Citation */
.reader-citation-btn {
  margin-top: 1rem;
  background: none;
  border: 1px solid var(--line);
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
  border-radius: 3px;
}

/* YouTube embed */
.reader-video-wrap {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}

.reader-video-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

/* Breakpoint */
@media (min-width: 768px) {
  dialog#reader {
    max-width: 800px;
    max-height: 90vh;
    margin: auto;
    border-radius: 6px;
  }
  .reader-panel { padding: 1.5rem 2rem; }
}