.theory-subnav {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.theory-subnav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0.55rem var(--space-page);
}

.theory-subnav__link {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.theory-subnav__link:hover,
.theory-subnav__link:focus-visible {
  color: var(--text);
  background: rgba(108, 158, 255, 0.08);
  outline: none;
}

.theory-subnav__link.is-active,
.theory-subnav__link[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: rgba(108, 158, 255, 0.35);
}

.app--guide .guide-main {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-page) clamp(1.5rem, 4vw, 2rem);
}

.guide-loading {
  color: var(--text-muted);
  padding: 2rem 0;
}

.guide-intro {
  margin: 1.5rem 0 1.75rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    linear-gradient(135deg, rgba(108, 158, 255, 0.09), transparent 60%),
    var(--surface);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
  line-height: 1.6;
}

.guide-intro a {
  color: var(--accent);
}

.guide-section {
  margin-bottom: 2rem;
}

.guide-section__title {
  position: relative;
  margin: 0 0 0.45rem;
  padding-left: 0.75rem;
  font-size: 1.15rem;
}

.guide-section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  bottom: 0.22em;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--studio-fill), var(--chord));
}

.guide-section__lead,
.guide-section__note {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.guide-section__note strong {
  color: var(--text);
}

.guide-triangle {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  width: 100%;
  max-width: 520px;
  margin-bottom: 1rem;
}

.guide-triangle__node {
  position: relative;
  z-index: 1;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  text-align: center;
}

.guide-triangle__node--tonic {
  grid-column: 1 / -1;
  justify-self: center;
  width: 100%;
  max-width: 220px;
}

.guide-triangle__node strong {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.guide-triangle__node small {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.guide-triangle__lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--text-muted);
  pointer-events: none;
}

.guide-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.guide-flow__step {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.55rem;
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.guide-flow__q {
  font-size: 0.88rem;
  font-weight: 700;
}

.guide-flow__outcomes {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.guide-flow__outcome {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  font-size: 0.8rem;
}

.guide-flow__outcome > span:last-child {
  color: var(--text-muted);
  line-height: 1.45;
}

.guide-venn {
  margin-bottom: 1.25rem;
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  text-align: center;
}

.guide-venn__outer {
  display: inline-block;
  min-width: min(100%, 320px);
  padding: 1.1rem 1.25rem 1.2rem;
  border-radius: 12px;
  border: 2px solid rgba(108, 158, 255, 0.45);
  background: rgba(108, 158, 255, 0.08);
}

.guide-venn__outer-title {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: #8eb8ff;
}

.guide-venn__outer-desc {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.guide-venn__inner {
  margin: 0.85rem auto 0;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 2px solid rgba(100, 200, 140, 0.55);
  background: rgba(100, 200, 140, 0.12);
  max-width: 240px;
}

.guide-venn__inner-title {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  color: #7dd4a3;
}

.guide-venn__inner-desc {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.guide-venn__note {
  margin: 0.75rem 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (max-width: 420px) {
  .guide-triangle {
    grid-template-columns: 1fr;
  }

  .guide-triangle__node--tonic {
    grid-column: 1;
    max-width: none;
    justify-self: stretch;
  }

  .guide-triangle__lines {
    display: none;
  }
}


.guide-scale-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.guide-scale-card {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-scale-card__title {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
}

.guide-scale-card__pattern {
  margin: 0 0 0.35rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--accent);
}

.guide-scale-card__desc {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.guide-scale-list {
  margin-top: 0.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.06);
}

.guide-scale-list__meta {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.guide-scale-list__items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(clamp(2.35rem, 11vw, 3.25rem), 1fr));
  gap: clamp(0.3rem, 1.5vw, 0.4rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-scale-list__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.55rem 0.25rem;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.guide-scale-list__degree {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  color: #4ade80;
}

.guide-scale-list__note {
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(0.78rem, 3.5vw, 0.95rem);
  font-weight: 700;
}

.guide-scale-list__flow {
  margin: 0.75rem 0 0;
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(0.68rem, 2.5vw, 0.78rem);
  color: var(--text-muted);
  text-align: center;
  word-break: break-word;
}


.guide-subsection__title {
  margin: 1.25rem 0 0.65rem;
  font-size: 0.92rem;
  font-weight: 700;
}

.guide-interval-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.guide-interval-card {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-interval-card--half {
  border-color: rgba(251, 191, 36, 0.45);
  background: rgba(251, 191, 36, 0.06);
}

.guide-interval-card--whole {
  border-color: rgba(96, 165, 250, 0.45);
  background: rgba(96, 165, 250, 0.06);
}

.guide-interval-card__title {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
}

.guide-interval-card__example {
  margin: 0 0 0.35rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--accent);
}

.guide-interval-card__desc {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.guide-chromatic {
  padding: clamp(0.65rem, 2vw, 0.85rem) clamp(0.4rem, 2vw, 0.65rem);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-chromatic__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.05rem;
  min-width: 0;
}

.guide-chromatic__cell {
  display: flex;
  align-items: center;
}

.guide-chromatic__note {
  display: grid;
  place-items: center;
  width: clamp(1.35rem, 4.5vw, 1.85rem);
  height: clamp(1.35rem, 4.5vw, 1.85rem);
  border-radius: 50%;
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(0.55rem, 2vw, 0.68rem);
  font-weight: 700;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.guide-chromatic__half {
  width: clamp(0.3rem, 1.5vw, 0.65rem);
  text-align: center;
  font-size: clamp(0.5rem, 1.8vw, 0.62rem);
  color: #fbbf24;
}

.guide-chromatic__hint {
  margin: 0.65rem 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

.guide-chromatic__mark--whole {
  color: #60a5fa;
  font-weight: 700;
}

.guide-chromatic__mark--half {
  color: #fbbf24;
  font-weight: 700;
}

.guide-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0;
  padding: 0.85rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.06);
}

.guide-steps__note {
  padding: clamp(0.28rem, 1.5vw, 0.35rem) clamp(0.35rem, 2vw, 0.55rem);
  border-radius: 6px;
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(0.72rem, 3vw, 0.88rem);
  font-weight: 700;
  background: var(--surface);
  border: 1px solid var(--border);
}

.guide-steps__gap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: clamp(1rem, 4vw, 1.5rem);
  padding: 0.15rem 0.25rem;
  font-size: clamp(0.6rem, 2.2vw, 0.68rem);
  font-weight: 700;
}

.guide-steps__gap--half {
  color: #fbbf24;
}

.guide-steps__gap--whole {
  color: #60a5fa;
}

.guide-steps__gap-label {
  padding: 0.1rem 0.35rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid currentColor;
}

.guide-steps__pattern {
  margin: 0.5rem 0 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
}


.guide-triad-stack {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  width: min(100%, 360px);
  max-width: 100%;
  margin-bottom: 1rem;
}

.guide-triad-stack__layer {
  display: grid;
  grid-template-columns: minmax(4.5rem, 5.5rem) minmax(2rem, 3rem) minmax(0, 1fr);
  align-items: center;
  gap: clamp(0.35rem, 2vw, 0.5rem);
  padding: clamp(0.55rem, 2vw, 0.65rem) clamp(0.65rem, 2.5vw, 0.85rem);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-triad-stack__layer--root {
  border-color: rgba(34, 197, 94, 0.55);
  background: rgba(34, 197, 94, 0.1);
}

.guide-triad-stack__layer--third {
  margin-inline-start: clamp(0.5rem, 5vw, 1.25rem);
  border-color: rgba(96, 165, 250, 0.45);
}

.guide-triad-stack__layer--fifth {
  margin-inline-start: clamp(1rem, 10vw, 2.5rem);
  border-color: rgba(167, 139, 250, 0.45);
}

.guide-triad-stack__label {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.guide-triad-stack__note {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.05rem;
  font-weight: 700;
}

.guide-triad-stack__detail {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.guide-triad-table {
  width: 100%;
  border-collapse: collapse;
  font-size: clamp(0.75rem, 2.5vw, 0.82rem);
}

.guide-triad-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.guide-triad-table th,
.guide-triad-table td {
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.guide-triad-table th {
  color: var(--text-muted);
  font-weight: 600;
}

.guide-triad-table em {
  color: var(--accent);
  font-style: normal;
}


.guide-section__mini {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.guide-neck-open {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 4.5rem), 1fr));
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.guide-neck-open__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.65rem 0.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-neck-open__label {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.guide-neck-open__note {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
}

.guide-neck-open__hint {
  font-size: 0.62rem;
  color: var(--text-muted);
}

.guide-neck-ladder {
  margin-bottom: 1rem;
  padding: 0.85rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-neck-ladder__string {
  margin: 0 0 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.guide-neck-ladder__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.guide-neck-ladder__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  min-width: 2.75rem;
  padding: 0.45rem 0.35rem;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.guide-neck-ladder__fret {
  font-size: 0.62rem;
  color: var(--text-muted);
}

.guide-neck-ladder__note {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88rem;
  font-weight: 700;
}

.guide-neck-grid-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 0.5rem;
}

.guide-neck-grid {
  display: inline-grid;
  min-width: 100%;
  padding: 0.65rem;
  border-radius: var(--radius);
  border: 1px solid rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.05);
}

.guide-neck-grid__row {
  display: grid;
  grid-template-columns: 1.75rem repeat(13, minmax(1.65rem, 1fr));
  gap: 0.15rem;
  align-items: center;
}

.guide-neck-grid__row + .guide-neck-grid__row {
  margin-top: 0.15rem;
}

.guide-neck-grid__row--head {
  margin-bottom: 0.25rem;
}

.guide-neck-grid__string,
.guide-neck-grid__fret-head {
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
}

.guide-neck-grid__cell {
  display: grid;
  place-items: center;
  min-height: 1.65rem;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.15);
}

.guide-neck-grid__cell--scale {
  background: rgba(34, 197, 94, 0.18);
  border: 1px solid rgba(34, 197, 94, 0.35);
}

.guide-neck-grid__cell--root {
  box-shadow: inset 0 0 0 2px var(--accent);
  background: rgba(108, 158, 255, 0.2);
}

.guide-neck-grid__note {
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(0.55rem, 2vw, 0.65rem);
  font-weight: 700;
  color: var(--text);
}

.guide-neck-grid__legend {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.guide-neck-grid__legend-scale {
  color: #4ade80;
  font-weight: 600;
}

.guide-neck-grid__legend-root {
  color: var(--accent);
  font-weight: 600;
}

.guide-neck-chord {
  display: grid;
  grid-template-columns: minmax(7rem, 8.5rem) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  margin-bottom: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-neck-chord__diagram {
  display: flex;
  justify-content: center;
}

.guide-neck-chord__diagram .diagram-svg {
  width: 100%;
  max-width: 110px;
  height: auto;
}

.guide-neck-chord__explain {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.guide-neck-chord__explain p {
  margin: 0 0 0.5rem;
  color: var(--text);
}

.guide-neck-chord__explain ul {
  margin: 0;
  padding-left: 1.1rem;
}

.guide-neck-chord__explain li + li {
  margin-top: 0.3rem;
}

.guide-neck-chord__missing {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.guide-neck-chord__missing a {
  color: var(--accent);
}

.guide-neck-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.guide-neck-card {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-neck-card__title {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
}

.guide-neck-card__body {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-muted);
}

@media (max-width: 520px) {
  .guide-neck-chord {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: left;
  }

  .guide-neck-build__layout {
    grid-template-columns: 1fr;
    justify-items: center;
  }
}

.guide-neck-tips {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.guide-neck-tips li + li {
  margin-top: 0.35rem;
}

.guide-neck-build {
  margin-bottom: 1.15rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.guide-neck-build__title {
  margin: 0 0 0.45rem;
  font-size: 0.92rem;
}

.guide-neck-build__layout {
  display: grid;
  grid-template-columns: minmax(6.5rem, 7.5rem) minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
}

.guide-neck-build__diagram .diagram-svg {
  width: 100%;
  max-width: 110px;
  height: auto;
}

.guide-neck-notes__table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.guide-neck-notes__table,
.guide-neck-types {
  width: 100%;
  border-collapse: collapse;
  font-size: clamp(0.72rem, 2.4vw, 0.8rem);
}

.guide-neck-notes__table th,
.guide-neck-notes__table td,
.guide-neck-types th,
.guide-neck-types td {
  padding: 0.45rem 0.55rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.guide-neck-notes__table th,
.guide-neck-types th {
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
}

.guide-neck-notes__summary {
  margin: 0.55rem 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.guide-neck-notes__role {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
}

.guide-neck-notes__role--triad {
  background: rgba(108, 158, 255, 0.15);
  color: var(--accent);
}

.guide-neck-notes__role--extra {
  background: rgba(34, 197, 94, 0.15);
  color: #4ade80;
}

.guide-neck-notes__role--out {
  background: rgba(251, 191, 36, 0.15);
  color: #fbbf24;
}

.guide-neck-memo {
  margin: 1rem 0 0.5rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(108, 158, 255, 0.25);
  background: rgba(108, 158, 255, 0.06);
}

.guide-neck-memo__title {
  margin: 0 0 0.45rem;
  font-size: 0.88rem;
}

.guide-neck-memo__list {
  margin: 0;
  padding-left: 1.15rem;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.guide-neck-memo__list li + li {
  margin-top: 0.25rem;
}