/* ─── NeckSight — Theory Blog Pages ────────────────────────────────────────── */

/* Layout */
.theory-page-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.theory-page-header {
  margin-bottom: 48px;
}

.theory-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 36px;
}

.theory-breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.theory-breadcrumb a:hover { color: var(--color-accent); }

.theory-breadcrumb-sep { opacity: 0.4; }

.theory-page-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.theory-page-title {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.8px;
  color: var(--color-text);
  line-height: 1.15;
  margin-bottom: 16px;
}

.theory-page-subtitle {
  font-size: 17px;
  color: var(--color-muted);
  line-height: 1.65;
  max-width: 600px;
}

.theory-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 12px;
  color: var(--color-muted);
}

.theory-meta-badge {
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.theory-meta-badge.beginner     { background: rgba(34,197,94,0.12);  color: #4ade80; }
.theory-meta-badge.intermediate { background: rgba(234,179,8,0.12);  color: #facc15; }
.theory-meta-badge.advanced     { background: rgba(239,68,68,0.12);  color: #f87171; }

/* Try on fretboard CTA */
.theory-try-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.35);
  border-radius: 6px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s;
  margin-top: 24px;
  margin-bottom: 40px;
}

.theory-try-btn:hover {
  background: rgba(6, 182, 212, 0.18);
  border-color: var(--color-accent);
}

/* Article body */
.theory-article {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-muted);
}

.theory-article h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.3px;
  margin: 48px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.theory-article h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin: 32px 0 12px;
}

.theory-article p {
  margin-bottom: 18px;
}

.theory-article p + p {
  margin-top: 0;
}

.theory-article strong {
  color: var(--color-text);
  font-weight: 600;
}

.theory-article em {
  color: var(--color-accent);
  font-style: italic;
}

.theory-article ul, .theory-article ol {
  padding-left: 20px;
  margin-bottom: 18px;
}

.theory-article li {
  margin-bottom: 6px;
}

/* Notation / chord symbol highlight */
.theory-note-name {
  display: inline-block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: 'Georgia', serif;
  font-size: 14px;
  color: var(--color-text);
}

/* Exercise box */
.exercise-box {
  border-left: 3px solid #f59e0b;
  background: rgba(245, 158, 11, 0.06);
  padding: 18px 20px;
  border-radius: 0 8px 8px 0;
  margin: 28px 0;
}

.exercise-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #f59e0b;
  margin-bottom: 8px;
}

.exercise-box h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.exercise-box p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

.exercise-try-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  border: 1px solid rgba(6,182,212,0.3);
  padding: 4px 10px;
  border-radius: 4px;
  transition: background 0.2s;
}

.exercise-try-btn:hover {
  background: rgba(6,182,212,0.1);
}

/* Challenge callout */
.challenge-box {
  border-left: 3px solid var(--color-accent);
  background: rgba(6, 182, 212, 0.06);
  padding: 18px 20px;
  border-radius: 0 8px 8px 0;
  margin: 28px 0;
}

.challenge-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.challenge-box h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.challenge-box p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0;
}

/* Key concept callout */
.concept-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 18px 20px;
  margin: 24px 0;
}

.concept-box strong {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.concept-box p {
  font-size: 14px;
  color: var(--color-text);
  margin: 0;
  line-height: 1.6;
}

/* Mode / scale comparison table */
.theory-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 13px;
}

.theory-table th {
  text-align: left;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
}

.theory-table td {
  padding: 10px 12px;
  color: var(--color-muted);
  border-bottom: 1px solid rgba(51,65,85,0.5);
  vertical-align: top;
}

.theory-table td:first-child {
  color: var(--color-text);
  font-weight: 500;
}

.theory-table tr:hover td {
  background: rgba(255,255,255,0.02);
}

.theory-table .highlight-row td {
  color: var(--color-accent);
}

/* Advanced section toggle */
details.theory-page-advanced {
  margin: 24px 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

details.theory-page-advanced summary {
  padding: 14px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
  cursor: pointer;
  list-style: none;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  gap: 6px;
}

details.theory-page-advanced[open] summary::before { content: '▼ '; font-size: 9px; color: var(--color-accent); }
details.theory-page-advanced:not([open]) summary::before { content: '▶ '; font-size: 9px; color: var(--color-accent); }

details.theory-page-advanced .theory-page-advanced-body {
  padding: 20px;
}

/* Page navigation (prev / next) */
.theory-page-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.theory-page-nav a {
  display: flex;
  flex-direction: column;
  padding: 14px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
  transition: border-color 0.2s;
  max-width: 48%;
}

.theory-page-nav a:hover {
  border-color: var(--color-accent);
}

.theory-page-nav a:last-child {
  text-align: right;
  margin-left: auto;
}

.theory-page-nav-dir {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.theory-page-nav-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

/* Table of contents */
.theory-toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 40px;
}

.theory-toc-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 10px;
}

.theory-toc ol {
  padding-left: 16px;
  margin: 0;
}

.theory-toc li {
  margin-bottom: 4px;
}

.theory-toc a {
  font-size: 13px;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.theory-toc a:hover { color: var(--color-accent); }

/* Hub page cards */
.theory-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.theory-hub-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.15s;
}

.theory-hub-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.theory-hub-card-level {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.theory-hub-card-level.beginner     { color: #4ade80; }
.theory-hub-card-level.intermediate { color: #facc15; }
.theory-hub-card-level.advanced     { color: #f87171; }

.theory-hub-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.theory-hub-card-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ── References list ──────────────────────────────────────────────────────── */
.ref-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0 40px;
}

.ref-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 0 12px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.55;
}

.ref-num {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  padding-top: 1px;
}

.ref-body {}

.ref-title {
  font-weight: 600;
  color: var(--color-text);
  display: block;
  margin-bottom: 3px;
}

.ref-title a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.ref-title a:hover {
  border-bottom-color: var(--color-accent);
}

.ref-meta {
  font-size: 12px;
  color: var(--color-muted);
}

.ref-type {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: middle;
  background: rgba(6,182,212,0.1);
  color: var(--color-accent);
}

.ref-type.pdf  { background: rgba(251,191,36,0.1); color: #fbbf24; }
.ref-type.video { background: rgba(239,68,68,0.1); color: #f87171; }
.ref-type.internal { background: rgba(148,163,184,0.1); color: var(--color-muted); }

/* Responsive */
@media (max-width: 599px) {
  .theory-page-title { font-size: 28px; }
  .theory-page-wrap { padding: 32px 16px 60px; }
  .theory-page-nav { flex-direction: column; }
  .theory-page-nav a { max-width: 100%; }
  .theory-page-nav a:last-child { text-align: left; margin-left: 0; }
  .ref-item { grid-template-columns: 22px 1fr; gap: 0 8px; padding: 12px; }
}