/* Tutorial page — scholarly parchment layout with sticky TOC and neume cards */

.tutorial-body {
  padding-top: 0;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
  z-index: 200;
  transition: width 0.12s ease-out;
}

.tutorial {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* Hero ------------------------------------------------------------------- */

.tutorial-hero {
  text-align: center;
  padding: 2.5rem 0 2rem;
  border-bottom: 2px solid var(--rule);
  margin-bottom: 2rem;
}

.tutorial-hero__kicker {
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.tutorial-hero__title {
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  font-weight: 600;
  margin: 0 0 0.75rem;
  line-height: 1.2;
}

.tutorial-hero__lede {
  color: var(--muted);
  max-width: 40rem;
  margin: 0 auto 1.25rem;
  font-size: 1.02rem;
  line-height: 1.65;
}

.tutorial-hero__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.82rem;
  color: var(--muted);
}

.tutorial-hero__meta span::before {
  content: "◆ ";
  color: var(--accent);
  font-size: 0.55rem;
  vertical-align: middle;
}

/* Layout ----------------------------------------------------------------- */

.tutorial__layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.tutorial__aside {
  position: relative;
  /* Stretch to the full grid-row height so the sticky TOC has room to travel
     as the page scrolls; otherwise the aside is only as tall as the TOC and
     the "sticky" position never engages. */
  align-self: stretch;
  height: 100%;
}

.toc-toggle {
  display: none;
  width: 100%;
  padding: 0.65rem 1rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
}

.toc {
  position: sticky;
  top: 1.5rem;
  padding: 1.25rem 1rem;
  margin-bottom: 0;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
}

.toc__heading {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 0.85rem;
  font-weight: 600;
}

.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc__list li {
  margin: 0;
}

.toc__link {
  display: block;
  padding: 0.32rem 0.5rem;
  margin: 0 -0.5rem;
  border-radius: 5px;
  color: var(--muted);
  text-decoration: none;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.82rem;
  line-height: 1.35;
  transition: color 0.12s, background 0.12s;
}

.toc__link:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.toc__link.is-active {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
}

/* Lessons ---------------------------------------------------------------- */

.tutorial__main {
  min-width: 0;
}

.lesson {
  scroll-margin-top: 1.5rem;
}

/* Newspaper-style depth markers: Part I (basics) -> Part III (expert). */
.tutorial-part {
  margin: 2.4rem 0 1rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--accent);
}

.tutorial-part:first-child {
  margin-top: 0;
}

.lesson__title {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 0 0 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--rule);
}

.lesson__subtitle {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.75rem 0 0.75rem;
}

.lesson p {
  margin: 0 0 1rem;
}

.lesson p:last-child {
  margin-bottom: 0;
}

/* Callouts --------------------------------------------------------------- */

.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.15rem;
  border-radius: 0 8px 8px 0;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

.callout--tip {
  background: var(--available-soft);
  border-left-color: var(--available);
}

.note-muted {
  font-size: 0.88rem;
  color: var(--muted);
}

.latin {
  font-style: italic;
  color: var(--muted);
  font-weight: 400;
}

.alias {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.88em;
}

/* Staff diagram ---------------------------------------------------------- */

.staff-diagram {
  margin: 1.5rem 0;
  text-align: center;
}

.staff-diagram svg {
  max-width: 100%;
  height: auto;
}

.staff-diagram figcaption {
  margin-top: 0.75rem;
  font-size: 0.88rem;
  color: var(--muted);
}

/* Clef grid -------------------------------------------------------------- */

.clef-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.clef-card {
  text-align: center;
  padding: 1rem;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

.clef-card h3 {
  font-size: 0.95rem;
  margin: 0.75rem 0 0.35rem;
}

.clef-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.gabc-code {
  display: inline-block;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.82rem;
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  color: var(--accent);
}

/* Tables ----------------------------------------------------------------- */

.solfège-table-wrap,
.modes-table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.25rem;
}

.solfège-table,
.modes-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.solfège-table th,
.solfège-table td,
.modes-table th,
.modes-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
}

.solfège-table th,
.modes-table th {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.solfège-table tbody tr:last-child td,
.modes-table tbody tr:last-child td {
  border-bottom: none;
}

/* Relative-length comparison table -------------------------------------- */

.len-table td {
  vertical-align: middle;
}

.len-cell {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.len-bar {
  display: inline-block;
  height: 12px;
  border-radius: 2px;
  background: var(--accent);
  flex: 0 0 auto;
}

.len-bar--same {
  background: var(--muted);
  opacity: 0.55;
}

.len-bar--short {
  background: #c9b48a;
}

.len-num {
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-size: 0.85rem;
}

.len-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.len-glyph.neume__art {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 0;
  width: 3rem;
  padding: 0;
  background: none;
  border: none;
  overflow: visible;
}

.len-glyph.neume__art img.neume-snippet {
  height: 2.1rem;
  width: auto;
  max-width: none;
  margin: 0;
}

.len-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.25rem 0 0.75rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.len-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.len-legend i {
  display: inline-block;
  width: 22px;
  height: 10px;
  border-radius: 2px;
}

/* Neume cards ------------------------------------------------------------ */

.neume-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.neume-grid--single {
  grid-template-columns: minmax(0, 480px);
}

.neume-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
  transition: box-shadow 0.15s, border-color 0.15s;
}

.neume-card:hover {
  border-color: #d4cbb8;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.neume__art {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
  padding: 1rem 1.25rem;
  background: var(--card);
  border-bottom: 1px solid var(--rule);
  overflow-x: auto;
  overflow-y: hidden;
}

.neume__art--wide {
  min-height: 110px;
  padding: 1.25rem 1.5rem;
}

.neume__art.is-rendered {
  /* subtle fade-in once the engraver paints */
  animation: neume-in 0.25s ease-out;
}

.neume__art.is-error {
  color: var(--muted);
  font-size: 0.82rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

@keyframes neume-in {
  from { opacity: 0.4; }
  to { opacity: 1; }
}

.neume__art img.neume-snippet {
  display: block;
  width: auto;
  max-width: 100%;
  height: 4.5rem;
  margin: 0 auto;
}

.clef-card .neume__art img.neume-snippet {
  height: 3.75rem;
}

.neume__art img.neume-snippet--wide {
  width: 100%;
  height: auto;
  max-width: 100%;
}

.neume-card__body {
  padding: 1rem 1.1rem 1.1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.neume-card__name {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.15rem;
}

.neume-card__latin {
  font-size: 0.82rem;
  font-style: italic;
  color: var(--muted);
  margin: 0 0 0.6rem;
}

.neume-card__body > p {
  font-size: 0.9rem;
  margin: 0 0 0.75rem;
  flex: 1;
}

.neume-card__meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 0.75rem;
  font-size: 0.82rem;
  margin: 0 0 0.85rem;
}

.neume-card__meta dt {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.neume-card__meta dd {
  margin: 0;
}

.neume-card__meta code {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.85em;
  color: var(--accent);
}

/* Play button ------------------------------------------------------------ */

.neume__play {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
  align-self: flex-start;
}

.neume__play:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.neume__play.is-playing {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.neume__play-icon {
  font-size: 0.65rem;
  line-height: 1;
}

/* Example blocks --------------------------------------------------------- */

.example-block {
  margin: 1.5rem 0;
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
}

.example-block__notation {
  padding: 1.25rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--rule);
  overflow-x: auto;
}

.example-block__caption {
  padding: 1rem 1.25rem 1.25rem;
}

.example-block__caption p {
  margin: 0 0 0.75rem;
  font-size: 0.92rem;
}

.example-block--large .example-block__notation {
  padding: 1.5rem;
}

/* Checklist & next steps ------------------------------------------------- */

.checklist {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.checklist li {
  margin-bottom: 0.5rem;
}

.next-steps-list {
  margin: 1rem 0 1.5rem;
  padding-left: 1.25rem;
}

.next-steps-list li {
  margin-bottom: 0.75rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Footer ----------------------------------------------------------------- */

.tutorial-footer {
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.88rem;
  color: var(--muted);
}

.tutorial-footer p {
  margin: 0 0 0.75rem;
}

/* Responsive ------------------------------------------------------------- */

@media (max-width: 860px) {
  .tutorial__layout {
    grid-template-columns: 1fr;
  }

  .toc-toggle {
    display: block;
  }

  .toc {
    position: static;
    display: none;
  }

  .toc.is-open {
    display: block;
  }

  .neume-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .tutorial {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .tutorial-hero {
    padding-top: 1.5rem;
  }

  .clef-grid {
    grid-template-columns: 1fr;
  }
}

@media print {
  .tutorial__aside,
  .progress-bar,
  .neume__play,
  .toc-toggle,
  .cta-row {
    display: none !important;
  }

  .tutorial__layout {
    grid-template-columns: 1fr;
  }

  .neume-card {
    break-inside: avoid;
  }
}

/* Foot-scan illustration (arsis/thesis) ---------------------------------- */

.foot-scan {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.5;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  margin: 0 0 1rem;
  overflow-x: auto;
  white-space: pre;
  color: var(--ink);
}

/* Learn hub -------------------------------------------------------------- */

.learn-grid {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.learn-card {
  margin: 0;
}

.learn-card__link {
  display: grid;
  grid-template-columns: auto 88px minmax(0, 1fr);
  gap: 1.25rem;
  align-items: center;
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--card);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.learn-card__link:hover {
  border-color: #d4cbb8;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.learn-card__link--static {
  cursor: default;
  opacity: 0.72;
}

.learn-card__link--static:hover {
  border-color: var(--rule);
  box-shadow: none;
}

.learn-card__index {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
  min-width: 1.5rem;
}

.learn-card__glyph {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 88px;
  height: 56px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--rule);
}

.learn-card__glyph svg {
  width: 72px;
  height: auto;
}

.learn-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.learn-card__kicker {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.learn-card__title {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.25;
}

.learn-card__desc {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
}

.learn-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.learn-card__tag {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--rule);
  color: var(--muted);
}

.learn-card__tag--new {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.learn-card__tag--soon {
  font-style: italic;
  text-transform: none;
  letter-spacing: 0;
}

.learn-card__count {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  color: var(--muted);
}

/* Tutorial series nav (sidebar) ------------------------------------------ */

.tutorial-series {
  padding: 1rem;
  margin-bottom: 1rem;
}

.tutorial-series__heading {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 0.65rem;
  font-weight: 600;
}

.tutorial-series__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tutorial-series__link {
  display: block;
  padding: 0.3rem 0.45rem;
  margin: 0 -0.45rem;
  border-radius: 5px;
  color: var(--muted);
  text-decoration: none;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.8rem;
  line-height: 1.35;
}

.tutorial-series__link:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.tutorial-series__link.is-current {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
}

.tutorial-series__link--soon {
  cursor: default;
  opacity: 0.65;
}

.tutorial-series__link--soon:hover {
  color: var(--muted);
  background: transparent;
}

.tutorial-series__link--holding:not(.is-current) {
  font-style: italic;
}

.tutorial-series__section {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0.75rem 0 0.35rem;
  padding: 0 0.45rem;
  font-weight: 600;
}

.tutorial-series__section:first-child {
  margin-top: 0;
}

/* Holding pages (outline only) ------------------------------------------- */

.tutorial-holding__badge {
  display: inline-block;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.35rem 0.65rem;
  border-radius: 4px;
  margin: 0 0 1.25rem;
}

.tutorial-holding__lede {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 1.5rem;
}

.tutorial-holding__outline {
  margin: 0 0 2rem;
}

.tutorial-holding__outline h2 {
  font-size: 1rem;
  margin: 1.5rem 0 0.5rem;
}

.tutorial-holding__outline h2:first-child {
  margin-top: 0;
}

.tutorial-holding__outline ol {
  margin: 0;
  padding-left: 1.25rem;
  line-height: 1.55;
}

.tutorial-holding__outline li {
  margin: 0.35rem 0;
}

.tutorial-holding__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 2rem 0;
}

.tutorial-holding__card {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.tutorial-holding__card h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.tutorial-holding__card p,
.tutorial-holding__card ul {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
}

.tutorial-holding__card ul {
  padding-left: 1.1rem;
}

.learn-section {
  margin: 2.5rem 0 0.75rem;
}

.learn-section__title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 1rem;
  font-weight: 600;
}

.learn-card__tag--wip {
  color: #6b5a2a;
  background: #f5edd8;
  border: 1px solid #e0d4b0;
}

.tutorial-hero__series {
  color: inherit;
  text-decoration: none;
}

.tutorial-hero__series:hover {
  color: var(--accent);
}

@media (max-width: 640px) {
  .learn-card__link {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
  }

  .learn-card__glyph {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
    width: 72px;
    height: 48px;
  }

  .learn-card__body {
    grid-column: 1 / -1;
    grid-row: 2;
  }
}