/* Reader layout and prose typography */
.reader-page {
  overflow-x: hidden;
  color-scheme: dark;
}

/* Scrollbars — match obsidian theme (sidebar search, modules, study assistant) */
.reader-sidebar,
.sidebar-search-results,
.study-assistant-results {
  scrollbar-width: thin;
  scrollbar-color: rgba(100, 116, 139, 0.65) rgba(15, 23, 42, 0.45);
}

.reader-sidebar::-webkit-scrollbar,
.sidebar-search-results::-webkit-scrollbar,
.study-assistant-results::-webkit-scrollbar {
  width: 8px;
}

.reader-sidebar::-webkit-scrollbar-track,
.sidebar-search-results::-webkit-scrollbar-track,
.study-assistant-results::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.45);
  border-radius: 999px;
}

.reader-sidebar::-webkit-scrollbar-thumb,
.sidebar-search-results::-webkit-scrollbar-thumb,
.study-assistant-results::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.55);
  border-radius: 999px;
  border: 2px solid rgba(15, 23, 42, 0.45);
  background-clip: padding-box;
}

.reader-sidebar::-webkit-scrollbar-thumb:hover,
.sidebar-search-results::-webkit-scrollbar-thumb:hover,
.study-assistant-results::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.75);
  background-clip: padding-box;
}

.reader-sidebar::-webkit-scrollbar-button,
.sidebar-search-results::-webkit-scrollbar-button,
.study-assistant-results::-webkit-scrollbar-button {
  display: none;
  height: 0;
  width: 0;
}

.reader-header .nav {
  flex-wrap: wrap;
}

.reader-header-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem 0.75rem;
  min-width: 0;
}

.reader-progress-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 160px;
}

.reader-progress-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--slate-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sidebar-toggle { display: none; }

.reader-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  min-height: calc(100vh - 140px);
  width: min(1400px, 100%);
  margin: 0 auto;
}

.reader-sidebar {
  border-right: 1px solid var(--border);
  background: rgba(7, 10, 18, 0.6);
  padding: 1.25rem 1rem 2rem;
  overflow-y: auto;
  max-height: calc(100vh - 72px);
  position: sticky;
  top: 72px;
}

.sidebar-section { margin-bottom: 1.5rem; }
.sidebar-bookmarks-panel { margin: 0; }
.sidebar-bookmarks-summary {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  cursor: pointer;
  list-style: none;
  margin-bottom: 0.5rem;
}
.sidebar-bookmarks-summary::-webkit-details-marker { display: none; }
.sidebar-bookmarks-summary::before {
  content: "▸";
  font-size: 0.65rem;
  color: var(--blue);
  transition: transform 0.15s ease;
}
.sidebar-bookmarks-panel[open] .sidebar-bookmarks-summary::before {
  transform: rotate(90deg);
}
.sidebar-bookmarks-count {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
}
.sidebar-bookmarks-nav {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  max-height: 260px;
  overflow-y: auto;
  padding-right: 0.25rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(100, 116, 139, 0.55) transparent;
}
.sidebar-bookmarks-nav::-webkit-scrollbar { width: 6px; }
.sidebar-bookmarks-nav::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.55);
  border-radius: 999px;
}
.sidebar-bookmark-row {
  display: flex;
  align-items: stretch;
  gap: 0.1rem;
}
.sidebar-bookmark-row .sidebar-bookmark-link {
  flex: 1;
  min-width: 0;
}
.sidebar-bookmark-remove {
  flex-shrink: 0;
  align-self: center;
  width: 1.65rem;
  height: 1.65rem;
  margin-right: 0.1rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--slate-dim);
  font-size: 1.05rem;
  line-height: 1;
  cursor: pointer;
}
.sidebar-bookmark-remove:hover,
.sidebar-bookmark-remove:focus-visible {
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.35);
  background: rgba(248, 113, 113, 0.1);
  outline: none;
}
@media (pointer: coarse) {
  .sidebar-bookmark-remove {
    width: 2.25rem;
    height: 2.25rem;
  }
}
.sidebar-bookmark-link {
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  text-decoration: none;
  border: 1px solid transparent;
}
.sidebar-bookmark-title {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.35;
}
.sidebar-bookmark-meta {
  display: block;
  margin-top: 0.1rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--slate-dim);
  line-height: 1.3;
}
.sidebar-bookmark-link:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.2);
}
.sidebar-bookmark-link:hover .sidebar-bookmark-title {
  color: var(--text);
}
.sidebar-bookmark-link.active {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.35);
}
.sidebar-bookmark-link.active .sidebar-bookmark-title {
  color: var(--blue);
}

.bookmark-notice {
  margin: 0.5rem 0 0;
  padding: 0.55rem 0.85rem;
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.sidebar-section .prompt {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--blue);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-nav a {
  display: block;
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid transparent;
}
.sidebar-nav a:hover {
  color: var(--text);
  background: var(--blue-dim);
  text-decoration: none;
}
.sidebar-nav a.active {
  color: var(--blue);
  border-color: rgba(59, 130, 246, 0.35);
  background: var(--blue-dim);
}
.sidebar-nav a.done::after {
  content: " ✓";
  color: #34d399;
  font-size: 0.75rem;
}

.sidebar-module {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 0.5rem;
  background: rgba(15, 23, 42, 0.4);
}
.sidebar-module summary {
  cursor: pointer;
  padding: 0.55rem 0.65rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
}
.sidebar-module summary::-webkit-details-marker { display: none; }
.sidebar-module-title { flex: 1; }
.sidebar-module-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--slate-dim);
}

.sidebar-module-confidence {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  padding: 0 0.65rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--slate-dim);
}

.sidebar-module-conf {
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.55);
}

.sidebar-conf-yes {
  color: #86efac;
  border-color: rgba(134, 239, 172, 0.25);
}

.sidebar-conf-partly {
  color: #fde68a;
  border-color: rgba(253, 230, 138, 0.25);
}

.sidebar-conf-notyet {
  color: #fca5a5;
  border-color: rgba(252, 165, 165, 0.25);
}

.sidebar-lessons a.lesson-not-yet {
  border-left: 2px solid rgba(252, 165, 165, 0.55);
  padding-left: calc(0.55rem - 2px);
}

.sidebar-lessons a.lesson-partly {
  border-left: 2px solid rgba(253, 230, 138, 0.45);
  padding-left: calc(0.55rem - 2px);
}

.sidebar-lessons a.lesson-yes {
  border-left: 2px solid rgba(134, 239, 172, 0.4);
  padding-left: calc(0.55rem - 2px);
}

.sidebar-lessons {
  padding: 0 0.35rem 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.sidebar-lessons a {
  font-size: 0.78rem;
  padding: 0.35rem 0.55rem;
}

.reader-main {
  padding: 1.5rem 2rem 3rem;
  max-width: 900px;
  min-width: 0;
  width: 100%;
}

.reader-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  min-width: 0;
}

.reader-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  max-width: 100%;
}

.reader-breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 0;
  overflow-wrap: anywhere;
}
.reader-breadcrumb a { color: var(--slate); }
.reader-breadcrumb .sep { margin: 0 0.35rem; opacity: 0.5; }

.mark-read {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
}
.mark-read input { accent-color: var(--blue); }

.reader-loading { color: var(--text-muted); }

.storage-warning {
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.35);
  color: #fcd34d;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

/* Prose */
.prose {
  color: var(--text);
  line-height: 1.75;
  font-size: 1rem;
}
.prose h1, .prose h2, .prose h3, .prose h4 {
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.02em;
  margin: 2rem 0 0.75rem;
  line-height: 1.25;
  scroll-margin-top: 5.5rem;
}
.prose h1 { font-size: 1.85rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.prose h2 { font-size: 1.4rem; color: var(--blue); }
.prose h3 { font-size: 1.15rem; }
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.5rem; }
.prose li { margin-bottom: 0.35rem; }
.prose a { color: var(--blue); word-break: break-word; }
.prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border);
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
}
.prose pre {
  margin: 0 0 1.25rem;
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.prose pre:not(.shiki) {
  background: rgba(7, 10, 18, 0.95);
  padding: 1rem 1.15rem;
}
.prose pre.shiki {
  padding: 0.85rem 1rem;
  font-size: 0.82rem;
  line-height: 1.6;
}
.prose pre code,
.prose pre.shiki code {
  font-family: var(--font-mono);
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  line-height: inherit;
}
.prose pre:not(.shiki) code {
  font-size: 0.82rem;
}
.prose blockquote {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--blue);
  background: var(--blue-dim);
  color: var(--text-muted);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.25rem;
  font-size: 0.9rem;
}
.prose th, .prose td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
.prose th { background: rgba(15, 23, 42, 0.8); }
.prose img { max-width: 100%; height: auto; border-radius: 8px; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

.reader-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.pager-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.65rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--slate);
  text-decoration: none;
  max-width: 45%;
}
.pager-btn:hover {
  border-color: rgba(59, 130, 246, 0.35);
  color: var(--text);
  text-decoration: none;
}
.pager-next { margin-left: auto; text-align: right; }

.lesson-legal {
  margin-top: 2rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.5);
  font-size: 0.82rem;
  color: var(--text-muted);
}
.lesson-legal-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--slate-dim);
  margin: 0 0 0.5rem;
}
.lesson-legal-text { margin: 0 0 0.5rem; line-height: 1.6; }
.lesson-legal-links { margin: 0; font-size: 0.8rem; }

.reader-footer { margin-top: 0; }

.content-error {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  text-align: left;
  max-width: 640px;
  margin: 1rem auto;
}
.content-error h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: #fca5a5;
}
.content-error p { margin: 0 0 1rem; color: var(--text-muted); }
.content-error ol {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.content-error li { margin-bottom: 0.35rem; }
.content-error code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--text);
}

.sidebar-empty {
  margin: 0;
  padding: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.sidebar-guide-group {
  margin-top: 0.35rem;
  border-top: 1px solid rgba(31, 42, 61, 0.6);
  padding-top: 0.35rem;
}

.sidebar-guide-group summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate-dim);
  padding: 0.35rem 0.5rem;
  list-style: none;
}

.sidebar-guide-group summary::-webkit-details-marker { display: none; }

.sidebar-guide-list {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-left: 0.25rem;
}

.sidebar-search-section {
  padding-bottom: 0.75rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid rgba(31, 42, 61, 0.6);
}

.sidebar-search-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate-dim);
  margin-bottom: 0.4rem;
}

.sidebar-search-input {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.85rem;
}

.sidebar-search-input:focus {
  outline: none;
  border-color: var(--blue);
}

.sidebar-search-results {
  margin-top: 0.5rem;
  max-height: 280px;
  overflow-y: auto;
  padding-right: 0.15rem;
}

.search-results-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.search-result-card {
  padding: 0.5rem 0.55rem;
  border-radius: 8px;
  border: 1px solid transparent;
  background: rgba(15, 23, 42, 0.35);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.search-result-card:hover {
  border-color: rgba(59, 130, 246, 0.25);
  background: rgba(59, 130, 246, 0.08);
}

.search-result-title {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  text-decoration: none;
}

.search-result-title:hover {
  color: var(--blue);
  text-decoration: underline;
}

.search-result-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--slate-dim);
  margin-top: 0.2rem;
}

.search-result-excerpt {
  margin: 0.35rem 0 0;
  font-size: 0.75rem;
  line-height: 1.45;
  color: var(--slate-dim);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.search-empty {
  margin: 0;
  padding: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.confidence-checkin {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
}

.confidence-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-dim);
}

.confidence-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.confidence-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.confidence-btn:hover { border-color: var(--blue); color: var(--text); }

.confidence-btn.active {
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.15);
  color: var(--blue);
}

.confidence-btn-clear {
  padding-inline: 0.45rem;
  color: var(--slate-dim);
}

#lesson-bookmark.active {
  border-color: rgba(59, 130, 246, 0.45);
  color: var(--blue);
  background: rgba(59, 130, 246, 0.1);
}

/* Focus sessions */
.focus-session-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.2rem;
}

.focus-session-picker {
  position: relative;
}

.focus-session-picker summary {
  list-style: none;
  cursor: pointer;
}

.focus-session-picker summary::-webkit-details-marker {
  display: none;
}

.focus-session-presets {
  position: absolute;
  right: 0;
  top: calc(100% + 0.35rem);
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 9rem;
  padding: 0.45rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(7, 10, 18, 0.96);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

.focus-preset-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: left;
  padding: 0.45rem 0.55rem;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.focus-preset-btn:hover {
  color: var(--text);
  border-color: rgba(59, 130, 246, 0.35);
  background: rgba(59, 130, 246, 0.1);
}

.focus-session-active {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.focus-timer {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.06em;
  min-width: 3.25rem;
  text-align: center;
}

.focus-weekly-hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--slate-dim);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.focus-end-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(3, 6, 14, 0.72);
}

.focus-end-overlay[hidden] {
  display: none !important;
}

.focus-end-card {
  width: min(420px, 100%);
  padding: 1.5rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(10, 14, 24, 0.98);
}

.focus-end-title {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  color: var(--text);
}

.focus-end-body {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 0.92rem;
}

.focus-end-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.reader-page.focus-active .reader-sidebar {
  display: none;
}

.reader-page.focus-active .reader-shell {
  grid-template-columns: 1fr;
}

.reader-page.focus-active .sidebar-toggle {
  display: none !important;
}

.reader-page.focus-active .reader-progress-wrap {
  display: none;
}

.reader-page.focus-active .focus-session-picker {
  display: none;
}

.reader-page.focus-active .confidence-checkin,
.reader-page.focus-active .mark-read,
.reader-page.focus-active #github-source,
.reader-page.focus-active .reader-pager,
.reader-page.focus-active .sidebar-search-section,
.reader-page.focus-active .reader-kbd-hint,
.reader-page.focus-active .reader-tool-btn,
.reader-page.focus-active #reader-print,
.reader-page.focus-active #reader-measure-toggle {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .focus-session-presets {
    animation: none;
  }
}

@media (max-width: 960px) {
  .reader-shell {
    grid-template-columns: 1fr;
    width: 100%;
    max-width: 100%;
    overflow-x: clip;
  }
  .sidebar-toggle { display: inline-flex; }
  .reader-sidebar {
    position: fixed;
    inset: 72px 0 0;
    z-index: 90;
    max-height: none;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    width: min(300px, 88vw);
  }
  .reader-sidebar.open { transform: translateX(0); }
  .reader-main {
    padding: 1rem;
    max-width: 100%;
    width: 100%;
  }
  .reader-header .nav {
    align-items: flex-start;
  }
  .reader-header-meta {
    width: 100%;
    justify-content: flex-end;
  }
  .reader-header-meta .nav-link-support {
    font-size: 0.72rem;
    padding-inline: 0.55rem;
  }
  .reader-progress-wrap { display: none; }
  .focus-session-wrap { align-items: flex-start; }
  .focus-session-presets { left: 0; right: auto; }
}

/* ── Curriculum media (CSP-safe replacements for external badge/thumbnail images) ── */

.reader-content .curriculum-media-link {
  display: inline-block;
  margin: 0.2rem 0.4rem 0.2rem 0;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.14));
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
  white-space: nowrap;
}

.reader-content .curriculum-media-link:hover {
  border-color: var(--accent, #5b9fd4);
  background: rgba(91, 159, 212, 0.08);
}

.reader-content .curriculum-media-fallback {
  display: inline-block;
  margin: 0.2rem 0.4rem 0.2rem 0;
  padding: 0.25rem 0.65rem;
  border: 1px dashed var(--border, rgba(255, 255, 255, 0.14));
  border-radius: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted, #9aa5b1);
}

/* ── Review due banner & lesson notes (learning loop tier 1) ── */

.review-due-banner {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid rgba(126, 184, 232, 0.35);
  border-radius: 0.5rem;
  background: rgba(126, 184, 232, 0.08);
  font-size: 0.88rem;
  line-height: 1.45;
}

.review-due-banner-label {
  font-weight: 600;
  color: var(--accent, #7eb8e8);
}

.review-due-banner-hint {
  display: block;
  margin-top: 0.2rem;
  color: var(--text-muted, #9aa5b1);
  font-size: 0.82rem;
}

.review-due-banner-link {
  color: var(--accent, #7eb8e8);
  text-decoration: none;
  font-weight: 500;
}

.review-due-banner-link:hover {
  text-decoration: underline;
}

.practice-path-banner {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid rgba(34, 197, 94, 0.28);
  background: rgba(34, 197, 94, 0.08);
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.practice-path-banner-label {
  font-weight: 600;
  color: #86efac;
}

.practice-path-banner-hint {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--slate-dim);
}

.practice-path-banner-link {
  color: var(--blue);
  font-weight: 600;
}

.practice-path-banner-link:hover {
  text-decoration: underline;
}

.lesson-notes-panel {
  margin: 0 0 1rem;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.12));
  border-radius: 0.5rem;
  background: rgba(0, 0, 0, 0.15);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.lesson-notes-panel--dirty {
  border-color: rgba(232, 184, 126, 0.45);
}

.lesson-notes-panel--saved {
  border-color: rgba(126, 232, 168, 0.55);
  box-shadow: 0 0 0 1px rgba(126, 232, 168, 0.15);
}

.lesson-notes-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.6rem;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted, #9aa5b1);
  list-style: none;
}

.lesson-notes-summary-label {
  flex: 0 0 auto;
}

.lesson-notes-summary-preview {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: normal;
  text-transform: none;
  color: var(--accent, #9ec8ef);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-notes-text {
  margin: 0 0 0.65rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.35rem;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.92rem;
  line-height: 1.55;
  white-space: normal;
}

.lesson-notes-view-hint {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  color: var(--text-muted, #9aa5b1);
  line-height: 1.45;
}

.lesson-notes-privacy {
  margin: 0.35rem 0 0.65rem;
  font-size: 0.78rem;
  color: var(--text-muted, #9aa5b1);
  line-height: 1.35;
}

/* Markdown note preview (safe: generated from text, no raw HTML). */
.lesson-notes-text p {
  margin: 0 0 0.7rem;
}
.lesson-notes-text p:last-child {
  margin-bottom: 0;
}
.lesson-notes-text h1,
.lesson-notes-text h2,
.lesson-notes-text h3 {
  margin: 0.2rem 0 0.7rem;
}
.lesson-notes-text h1 {
  font-size: 1.1rem;
}
.lesson-notes-text h2 {
  font-size: 1.0rem;
}
.lesson-notes-text h3 {
  font-size: 0.95rem;
}
.lesson-notes-text ul {
  margin: 0 0 0.7rem;
  padding-left: 1.25rem;
}
.lesson-notes-text li {
  margin: 0.25rem 0;
}
.lesson-notes-text blockquote {
  margin: 0.7rem 0;
  padding: 0.25rem 0.7rem;
  border-left: 3px solid rgba(59, 130, 246, 0.45);
  background: rgba(59, 130, 246, 0.08);
  color: var(--text-muted, #9aa5b1);
  border-radius: 8px;
}

.lesson-notes-inline-quote {
  display: inline-block;
  margin-left: 0.15rem;
  padding: 0.1rem 0.45rem;
  border-left: 2px solid rgba(59, 130, 246, 0.45);
  background: rgba(59, 130, 246, 0.08);
  color: var(--text-muted, #c5d0dc);
  border-radius: 6px;
  font-style: italic;
}
.lesson-notes-text code {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace);
  font-size: 0.92em;
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid rgba(148, 163, 184, 0.2);
  padding: 0.08rem 0.35rem;
  border-radius: 6px;
}
.lesson-notes-text pre {
  margin: 0 0 0.7rem;
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow-x: auto;
}
.lesson-notes-text pre code {
  border: none;
  background: transparent;
  padding: 0;
}
.lesson-notes-text a {
  color: var(--accent, #9ec8ef);
  word-break: break-word;
}

.lesson-notes-summary::-webkit-details-marker {
  display: none;
}

.lesson-notes-body {
  padding: 0 0.85rem 0.85rem;
}

.lesson-notes-prompt {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted, #9aa5b1);
}

.lesson-notes-type {
  margin: 0 0 0.35rem;
  padding: 0.55rem 0.65rem 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.22);
  min-width: 0;
}

.lesson-notes-type-legend {
  padding: 0 0.25rem;
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted, #9aa5b1);
  letter-spacing: 0.02em;
}

.lesson-notes-type-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.lesson-notes-type-btn {
  padding: 0.38rem 0.72rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted, #b8c5d3);
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.12s ease;
}

.lesson-notes-type:not(.lesson-notes-type--readonly) .lesson-notes-type-btn[aria-pressed="false"]:hover,
.lesson-notes-panel--viewing .lesson-notes-type-btn[aria-pressed="false"]:hover {
  color: #e8f4fc;
  border-color: rgba(126, 184, 232, 0.55);
  background: rgba(126, 184, 232, 0.14);
  box-shadow: 0 0 0 1px rgba(126, 184, 232, 0.2);
  transform: translateY(-1px);
  opacity: 1;
}

.lesson-notes-type:not(.lesson-notes-type--readonly) .lesson-notes-type-btn[aria-pressed="false"]:active {
  transform: translateY(0);
  background: rgba(126, 184, 232, 0.22);
}

.lesson-notes-panel--viewing .lesson-notes-type-btn[aria-pressed="false"] {
  opacity: 0.5;
}

.lesson-notes-panel--viewing .lesson-notes-type-btn[aria-pressed="true"] {
  opacity: 1;
}

.lesson-notes-type-btn[aria-disabled="true"] {
  pointer-events: none;
  opacity: 0.4;
  cursor: default;
}

.lesson-notes-type-btn:focus-visible {
  outline: 2px solid rgba(126, 184, 232, 0.75);
  outline-offset: 2px;
}

.lesson-notes-type-btn[aria-pressed="true"],
.lesson-notes-type-btn.is-selected {
  color: #0b1220;
  background: #7eb8e8;
  border-color: #9ec8ef;
  box-shadow: 0 0 0 2px rgba(126, 184, 232, 0.35);
}

.lesson-notes-type-btn[data-note-prompt="confused"][aria-pressed="true"],
.lesson-notes-type-btn[data-note-prompt="confused"].is-selected {
  background: #fbbf24;
  border-color: #fcd34d;
  color: #1a1200;
  box-shadow: 0 0 0 2px rgba(251, 191, 36, 0.35);
}

.lesson-notes-type-btn[data-note-prompt="apply"][aria-pressed="true"],
.lesson-notes-type-btn[data-note-prompt="apply"].is-selected {
  background: #86efac;
  border-color: #bbf7d0;
  color: #052e16;
  box-shadow: 0 0 0 2px rgba(134, 239, 172, 0.3);
}

.lesson-notes-type-hint {
  margin: 0 0 0.65rem;
  font-size: 0.74rem;
  color: var(--text-muted, #a8b6c6);
  line-height: 1.4;
  transition: color 0.2s ease;
}

.lesson-notes-type-hint--flash {
  color: #c8e4ff;
}

.lesson-notes-panel--viewing .lesson-notes-type-hint {
  color: #9eb4c9;
}

.lesson-notes-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.45rem;
}

.lesson-notes-format-btn {
  padding: 0.28rem 0.55rem;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-muted, #c5d0dc);
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.lesson-notes-format-btn:hover,
.lesson-notes-format-btn:focus-visible {
  color: var(--accent, #9ec8ef);
  border-color: rgba(126, 184, 232, 0.45);
  outline: none;
}

.lesson-notes-format-btn[aria-pressed="true"] {
  color: #0f172a;
  background: rgba(126, 184, 232, 0.9);
  border-color: transparent;
}

.lesson-notes-preview-toggle {
  margin-left: auto;
}

.lesson-notes-live-preview {
  margin: 0.45rem 0 0.65rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.35rem;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(126, 184, 232, 0.25);
  min-height: 3rem;
}

.lesson-notes-live-preview:empty::before {
  content: "Preview will appear here…";
  color: var(--text-muted, #9aa5b1);
  font-size: 0.84rem;
}

.lesson-notes-format-hint {
  margin: 0.35rem 0 0.5rem;
  font-size: 0.76rem;
  color: var(--text-muted, #9aa5b1);
  line-height: 1.4;
}

.lesson-notes-format-hint code {
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 0.9em;
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.lesson-notes-input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.14));
  border-radius: 0.35rem;
  background: rgba(0, 0, 0, 0.2);
  color: inherit;
  font: inherit;
  line-height: 1.45;
  resize: vertical;
  min-height: 4.5rem;
}

.lesson-notes-input:focus {
  outline: 2px solid rgba(126, 184, 232, 0.45);
  outline-offset: 1px;
}

.lesson-notes-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.55rem;
}

.lesson-notes-status {
  margin: 0.65rem 0 0;
  padding: 0.45rem 0.6rem;
  border-radius: 0.35rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: #9ee8c0;
  background: rgba(126, 232, 168, 0.1);
  border: 1px solid rgba(126, 232, 168, 0.35);
}

.lesson-notes-status[hidden] {
  display: none !important;
}

.lesson-notes-status--error {
  color: #fca5a5;
  background: rgba(248, 113, 113, 0.1);
  border-color: rgba(248, 113, 113, 0.35);
}

.lesson-notes-hint {
  margin: 0.35rem 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.lesson-notes-hint--warn {
  color: #fbbf24;
}

/* ── Reader tools: narrow measure, code blocks, checkpoint, explain prompt ── */

.reader-page.reader-narrow .reader-content {
  max-width: 65ch;
}

.reader-page.reader-narrow .reader-main {
  max-width: calc(65ch + 3rem);
  margin-inline: auto;
}

.reader-page.focus-active .reader-content {
  max-width: 65ch;
  line-height: 1.75;
}

.reader-page.focus-active .reader-main {
  max-width: calc(65ch + 3rem);
  margin-inline: auto;
}

.module-checkpoint-host {
  margin-bottom: 1rem;
}

.module-checkpoint-banner {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid rgba(59, 130, 246, 0.35);
  background: rgba(59, 130, 246, 0.08);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.module-checkpoint-intro {
  margin: 0;
  line-height: 1.5;
}

.module-checkpoint-notyet {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(59, 130, 246, 0.2);
}

.module-checkpoint-notyet-title {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.module-checkpoint-notyet-list {
  margin: 0;
  padding-left: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.module-checkpoint-notyet-list a {
  color: var(--blue);
  font-weight: 500;
  font-size: 0.88rem;
}

.module-checkpoint-banner a {
  color: var(--blue);
  font-weight: 600;
}

.study-assistant-panel {
  margin-bottom: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.45);
}

.study-assistant-summary {
  cursor: pointer;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blue);
  list-style: none;
}

.study-assistant-summary::-webkit-details-marker {
  display: none;
}

.study-assistant-body {
  padding: 0 1rem 1rem;
  border-top: 1px solid rgba(31, 42, 61, 0.5);
}

.study-assistant-disclaimer {
  margin: 0.75rem 0 1rem;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.study-assistant-disclaimer a {
  color: var(--blue);
}

.study-assistant-label {
  display: block;
  font-size: 0.8rem;
  color: var(--slate-dim);
  margin-bottom: 0.35rem;
}

.study-assistant-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.study-assistant-input {
  flex: 1 1 12rem;
  min-width: 0;
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
}

.study-assistant-input:focus {
  outline: none;
  border-color: var(--blue);
}

.study-assistant-status {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--slate-dim);
}

.study-assistant-results {
  margin-top: 0.75rem;
}

.study-assistant-results-intro {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.study-assistant-results-list {
  margin: 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.study-assistant-result-link {
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
}

.study-assistant-result-link:hover {
  text-decoration: underline;
}

.study-assistant-snippet {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.study-assistant-empty {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.code-block-wrap {
  position: relative;
  margin: 1rem 0;
}

.code-block-wrap pre {
  margin: 0;
}

.code-block-toolbar {
  display: flex;
  justify-content: flex-end;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
}

.code-block-btn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.6);
  color: var(--text-muted);
  cursor: pointer;
  text-decoration: none;
}

.code-block-btn:hover {
  color: var(--text);
  border-color: var(--blue);
}

.reader-kbd-hint {
  margin: 1.25rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--slate-dim);
  text-align: center;
}

.reader-kbd-hint kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.5);
  font-size: 0.68rem;
}

.explain-prompt-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.65);
}

.explain-prompt-overlay[hidden] {
  display: none !important;
}

.explain-prompt-card {
  width: min(480px, 100%);
  padding: 1.5rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(10, 14, 24, 0.98);
}

.explain-prompt-title {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.explain-prompt-desc {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.explain-prompt-input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.92rem;
  resize: vertical;
  min-height: 4.5rem;
}

.explain-prompt-status {
  margin: 0.55rem 0 0;
  padding: 0.45rem 0.6rem;
  border-radius: 0.35rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: #9ee8c0;
  background: rgba(126, 232, 168, 0.1);
  border: 1px solid rgba(126, 232, 168, 0.35);
}

.explain-prompt-status[hidden] {
  display: none !important;
}

.explain-prompt-status--error {
  color: #fca5a5;
  background: rgba(248, 113, 113, 0.1);
  border-color: rgba(248, 113, 113, 0.35);
}

.explain-prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.pre-review-overlay {
  position: fixed;
  inset: 0;
  z-index: 210;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.72);
}

.pre-review-overlay[hidden] {
  display: none !important;
}

.pre-review-card {
  width: min(520px, 100%);
  padding: 1.5rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(10, 14, 24, 0.98);
}

.pre-review-title {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.pre-review-desc {
  margin: 0 0 0.85rem;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}

.pre-review-input {
  width: 100%;
  min-height: 6.5rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.55);
  color: inherit;
  font: inherit;
  line-height: 1.45;
  resize: vertical;
}

.pre-review-status {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.pre-review-status[hidden] {
  display: none !important;
}

.pre-review-status--error {
  color: #f87171;
  background: rgba(248, 113, 113, 0.1);
  border-color: rgba(248, 113, 113, 0.35);
}

.pre-review-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

body.reader-pre-review-active {
  overflow: hidden;
}

body.reader-pre-review-active .reader-main {
  visibility: hidden;
}

@media print {
  .grid-bg,
  .vignette,
  .site-header,
  .reader-sidebar,
  .reader-toolbar,
  .reader-pager,
  .reader-kbd-hint,
  .lesson-legal,
  .site-footer,
  .focus-session-wrap,
  .module-checkpoint-host,
  .explain-prompt-overlay,
  .pre-review-overlay,
  .focus-end-overlay {
    display: none !important;
  }

  body.reader-page {
    background: #fff;
    color: #111;
  }

  .reader-shell {
    display: block;
  }

  .reader-main {
    padding: 0;
    max-width: none;
  }

  .reader-content {
    max-width: none;
    font-size: 11pt;
    line-height: 1.5;
  }

  .reader-content a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555;
  }
}