/* Courses — catalog and per-course pages */

.course-single {
  padding: 2.5rem 0 4rem;
}

.course-single .module-breadcrumb {
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-light);
}
.course-single .module-breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
}
.course-single .module-breadcrumb .sep {
  margin: 0 0.5rem;
}

.course-header {
  margin-bottom: 2.5rem;
}
.course-header .lead {
  font-size: 1.15rem;
  color: var(--text-light);
  margin: 0.5rem 0 1rem;
}
.course-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  color: var(--text-light);
  font-size: 0.95rem;
}

.course-gate[hidden] {
  display: none;
}

.course-toolbar {
  margin-bottom: 1.5rem;
}
.course-search {
  width: 100%;
  max-width: 420px;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color, #ddd);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
}

.course-files {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.course-file[hidden] {
  display: none;
}

.course-file__open {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--card-bg, #fff);
  border: 1px solid var(--border-color, #e3e3e3);
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
  text-align: left;
  transition: border-color 0.15s ease, transform 0.05s ease;
}
.course-file__open:hover {
  border-color: var(--primary-color);
}
.course-file__open:active {
  transform: translateY(1px);
}
.course-file__open[aria-busy="true"] {
  opacity: 0.6;
  cursor: wait;
}

.course-file__kind {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  background: var(--tag-bg, #eef2ff);
  color: var(--tag-fg, #4338ca);
  white-space: nowrap;
}
.course-file[data-kind="deck"] .course-file__kind   { background: #fef3c7; color: #92400e; }
.course-file[data-kind="handout"] .course-file__kind { background: #dcfce7; color: #166534; }

.course-file__body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}
.course-file__title {
  font-weight: 600;
}
.course-file__desc {
  font-size: 0.9rem;
  color: var(--text-light);
}
.course-file__arrow {
  color: var(--text-light);
  font-size: 1.1rem;
}

.course-file__status {
  margin: 0.4rem 0 0;
  padding: 0.55rem 0.85rem;
  font-size: 0.9rem;
  border-radius: 6px;
  background: #fef2f2;
  color: #991b1b;
}
.course-file__status[data-kind="info"] {
  background: #eff6ff;
  color: #1e40af;
}

.course-empty {
  color: var(--text-light);
  font-style: italic;
}

/* =====================================================
   COURSE BLOCKS VIEW
   ===================================================== */

.course-blocks {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Individual block */
.cblock {
  border-radius: 0.875rem;
  border: 1.5px solid var(--border-color, #e3e3e3);
  background: var(--card-bg, #fff);
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.cblock:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.cblock[hidden] { display: none; }

/* Block header */
.cblock__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.125rem 1.375rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 1rem;
  transition: background 0.15s;
  font: inherit;
}
.cblock__header:hover { background: var(--background-alt, #f8f8f8); }

.cblock__header-left {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  min-width: 0;
}

.cblock__seq {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--background-alt, #f3f4f6);
  border: 1.5px solid var(--border-color, #e3e3e3);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-color, #111);
  flex-shrink: 0;
}

.cblock__title-group { min-width: 0; }
.cblock__title {
  margin: 0 0 0.1rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-color, #111);
}
.cblock__count {
  font-size: 0.78rem;
  color: var(--text-light, #666);
}

.cblock__header-right {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-shrink: 0;
}

.cblock__progress-badge {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-light, #666);
  background: var(--background-alt, #f3f4f6);
  border: 1px solid var(--border-color, #e3e3e3);
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
}

.cblock__chevron {
  color: var(--text-light, #999);
  transition: transform 0.22s ease;
  flex-shrink: 0;
}
.cblock__header[aria-expanded="false"] .cblock__chevron { transform: rotate(-90deg); }

/* Block body */
.cblock__body {
  border-top: 1px solid var(--border-color, #e3e3e3);
  padding: 1.25rem 1.375rem;
}
.cblock__body[hidden] { display: none; }

.cblock__summary {
  margin-bottom: 1.125rem;
  padding: 0.875rem 1rem;
  background: var(--background-alt, #f8f8f8);
  border-radius: 0.5rem;
  border-left: 3px solid var(--primary-color, #4338ca);
}
.cblock__summary p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-light, #555);
  line-height: 1.65;
}

/* Lesson list */
.cblock__lessons {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.cblock__lesson {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-color, #e3e3e3);
  border-radius: 0.625rem;
  background: var(--card-bg, #fff);
  transition: border-color 0.15s, box-shadow 0.12s;
}
.cblock__lesson:hover {
  border-color: var(--primary-color, #4338ca);
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}
.cblock__lesson[hidden] { display: none; }

.cblock__lesson-seq {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-light, #999);
  min-width: 2rem;
  padding-top: 0.15rem;
  flex-shrink: 0;
}

.cblock__lesson-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.cblock__lesson-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-color, #111);
  line-height: 1.4;
}

.cblock__lesson-desc {
  font-size: 0.84rem;
  color: var(--text-light, #666);
  line-height: 1.55;
}

.cblock__lesson-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.3rem;
  flex-wrap: wrap;
}

.cblock__kind-tag {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: var(--tag-bg, #eef2ff);
  color: var(--tag-fg, #4338ca);
}
[data-kind="deck"]    .cblock__kind-tag { background: #fef3c7; color: #92400e; }
[data-kind="handout"] .cblock__kind-tag { background: #dcfce7; color: #166534; }

.cblock__size {
  font-size: 0.75rem;
  color: var(--text-light, #999);
}

.cblock__has-video {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.72rem;
  color: #1d4ed8;
  background: #dbeafe;
  border: 1px solid #bfdbfe;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
}

/* Lesson action buttons */
.cblock__lesson-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.375rem;
  flex-shrink: 0;
}

.cblock__lesson-status {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: transparent;
  display: none;
}
.cblock__lesson-status[data-done="true"] {
  display: block;
  background: #10b981;
}

.cblock__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 0.8rem;
  border-radius: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
  font: inherit;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.cblock__btn:active { transform: translateY(1px); }

.cblock__btn--view {
  background: var(--primary-color, #4338ca);
  color: #fff;
}
.cblock__btn--view:hover { background: var(--secondary-color, #6366f1); }

.cblock__btn--tab {
  background: transparent;
  color: var(--text-light, #666);
  border-color: var(--border-color, #e3e3e3);
}
.cblock__btn--tab:hover {
  border-color: var(--primary-color, #4338ca);
  color: var(--primary-color, #4338ca);
}

.cblock__lesson-status-msg {
  margin-top: 0.35rem;
  padding: 0.45rem 0.75rem;
  font-size: 0.85rem;
  border-radius: 6px;
  background: #fef2f2;
  color: #991b1b;
}
.cblock__lesson-status-msg[data-kind="info"] { background: #eff6ff; color: #1e40af; }

/* Block footer */
.cblock__footer {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color, #e3e3e3);
}

.cblock__bar {
  flex: 1;
  height: 5px;
  background: var(--border-color, #e3e3e3);
  border-radius: 999px;
  overflow: hidden;
}
.cblock__bar-fill {
  height: 100%;
  background: #10b981;
  border-radius: 999px;
  transition: width 0.35s ease;
}
.cblock__bar-label {
  font-size: 0.76rem;
  color: var(--text-light, #999);
  white-space: nowrap;
}

/* =====================================================
   INLINE SPLIT-SCREEN VIEWER  (full-window overlay)
   ===================================================== */

.cviewer__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 999;
}
.cviewer__backdrop[hidden] { display: none; }

.cviewer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  background: var(--background-color, #fff);
}
.cviewer[hidden] { display: none; }

/* Toolbar */
.cviewer__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: var(--background-alt, #f8f8f8);
  border-bottom: 1px solid var(--border-color, #e3e3e3);
  flex-shrink: 0;
  gap: 0.75rem;
  flex-wrap: wrap;
  min-height: 48px;
}

.cviewer__toolbar-left {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.cviewer__nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--border-color, #e3e3e3);
  background: var(--background, #fff);
  color: var(--text-color, #111);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, opacity 0.12s;
}
.cviewer__nav-btn:hover:not(:disabled) {
  background: var(--background-alt, #f4f4f4);
  border-color: var(--text-light, #999);
}
.cviewer__nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.cviewer__position {
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-light, #666);
  min-width: 3.25rem;
  text-align: center;
  white-space: nowrap;
}
.cviewer__lesson-label {
  margin-left: 0.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-color, #111);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cviewer__toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-shrink: 0;
}

.cviewer__tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border-color, #e3e3e3);
  background: var(--card-bg, #fff);
  color: var(--text-light, #666);
  border-radius: 0.375rem;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  font: inherit;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.cviewer__tool-btn:hover {
  border-color: var(--primary-color, #4338ca);
  color: var(--primary-color, #4338ca);
}

.cviewer__close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-color, #e3e3e3);
  background: var(--card-bg, #fff);
  border-radius: 0.375rem;
  cursor: pointer;
  color: var(--text-light, #666);
  transition: border-color 0.15s, color 0.15s;
}
.cviewer__close-btn:hover {
  border-color: #dc2626;
  color: #dc2626;
}

/* Panels */
.cviewer__panels {
  display: flex;
  flex: 1;
  overflow: hidden;
  user-select: none;
}

.cviewer__panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 120px;
}
.cviewer__panel[hidden] { display: none; }

.cviewer__panel-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.375rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light, #888);
  background: var(--background-alt, #f8f8f8);
  border-bottom: 1px solid var(--border-color, #e3e3e3);
  flex-shrink: 0;
}
.cviewer__hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-style: italic;
}

/* Video side */
.cviewer__video-wrapper {
  flex: 1;
  overflow: hidden;
  background: #000;
}
#cviewer-video-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* HTML side */
.cviewer__html-wrapper {
  flex: 1;
  overflow: hidden;
  position: relative;
}
#cviewer-html-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Loading spinner */
.cviewer__loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: var(--background-alt, #f8f8f8);
  color: var(--text-light, #666);
  font-size: 0.9rem;
}
/* `display: flex` above outranks the UA default for [hidden]; restore it. */
.cviewer__loading[hidden] { display: none; }
.cviewer__spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color, #e3e3e3);
  border-top-color: var(--primary-color, #4338ca);
  border-radius: 50%;
  animation: cviewer-spin 0.8s linear infinite;
}
@keyframes cviewer-spin { to { transform: rotate(360deg); } }

/* Error state */
.cviewer__error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.875rem;
  background: var(--background-alt, #f8f8f8);
  color: var(--text-light, #666);
  text-align: center;
  padding: 2rem;
}
.cviewer__error[hidden] { display: none; }
.cviewer__error[hidden] { display: none; }
.cviewer__error p { margin: 0; font-size: 0.9rem; }
.cviewer__retry-btn {
  padding: 0.5rem 1.25rem;
  background: var(--primary-color, #4338ca);
  color: #fff;
  border: none;
  border-radius: 0.5rem;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.cviewer__retry-btn:hover { background: var(--secondary-color, #6366f1); }

/* Drag handle */
.cviewer__handle {
  width: 7px;
  flex-shrink: 0;
  background: var(--border-color, #e3e3e3);
  cursor: col-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  position: relative;
  z-index: 1;
}
.cviewer__handle[hidden] { display: none; }
.cviewer__handle:hover,
.cviewer__handle.dragging { background: var(--primary-color, #4338ca); }

.cviewer__handle-grip {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.cviewer__handle-grip span {
  width: 3px; height: 3px;
  border-radius: 50%;
  background: #fff;
  opacity: 0.7;
  display: block;
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 640px) {
  .cblock__header { padding: 0.875rem 1rem; flex-wrap: wrap; }
  .cblock__lesson { flex-wrap: wrap; }
  .cblock__lesson-actions { flex-direction: row; width: 100%; justify-content: flex-end; }

  .cviewer__panels { flex-direction: column; }
  .cviewer__panel-video,
  .cviewer__panel--video { width: 100% !important; height: 220px; }
  .cviewer__panel--html  { width: 100% !important; flex: 1; }
  .cviewer__handle {
    width: 100%; height: 7px; cursor: row-resize;
  }
  .cviewer__handle-grip { flex-direction: row; }
  .cviewer__toolbar { flex-direction: column; align-items: flex-start; }
  .cviewer__toolbar-right { flex-wrap: wrap; }
}