/* ============================================================
   LINGUIST — Course Module Styles
   Shared stylesheet for all module pages, course index,
   and reference pages.
   ============================================================ */

/* ============================================================
   STAGE PALETTE OVERRIDES
   ============================================================ */

body.stage-enabled .module-nav-bar { background: #F5F2ED; border-color: #DDD8D0; }
body.stage-enabled .module-eyebrow { color: #6B7B5E; }
body.stage-enabled .module-pagination-title { color: #6B7B5E; }
body.stage-enabled .keynote { color: #6B7B5E; }

body.stage-advanced { background: var(--c-bg); color: var(--c-text); }
body.stage-advanced .site-header { background: var(--c-bg); border-color: var(--c-border); }
body.stage-advanced .site-logo { color: var(--c-muted); }
body.stage-advanced .site-header-link { color: var(--c-muted); }
body.stage-advanced .site-header-link:hover { color: var(--c-text); }
body.stage-advanced .module-nav-bar { background: #E8EDF2; border-color: var(--c-border); }
body.stage-advanced .module-hero { border-color: var(--c-border); }
body.stage-advanced .module-eyebrow { color: var(--c-muted); }
body.stage-advanced .module-body h2 { color: var(--c-text); }
body.stage-advanced .module-body p { color: var(--c-text); }
body.stage-advanced .module-body li { color: var(--c-text); }
body.stage-advanced .module-body hr { border-color: var(--c-border); }
body.stage-advanced .module-body code { background: #E5EFF7; border-color: var(--c-border); }
body.stage-advanced .module-body pre { background: #E5EFF7; border-color: var(--c-border); }
body.stage-advanced .module-body blockquote { background: #E5EFF7; }
body.stage-advanced .module-pagination { border-color: var(--c-border); }
body.stage-advanced .module-pagination-title { color: var(--c-accent); }
body.stage-advanced .site-footer { border-color: var(--c-border); }
body.stage-advanced a { color: var(--c-accent); }
body.stage-advanced a:hover { color: var(--c-accent-soft); }
body.stage-advanced .keynote { color: var(--c-accent); }

/* ---- Stage threshold banner ---- */
.stage-threshold {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  border-bottom: 1px solid var(--w-border);
  background: var(--w-bg-card);
}

.stage-threshold-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--w-accent);
  margin-bottom: var(--space-sm);
}

.stage-threshold-title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.3;
  color: var(--w-text);
  max-width: 36ch;
  margin: 0 auto;
}

body.stage-enabled .stage-threshold { background: #F5F2ED; border-color: #DDD8D0; }
body.stage-enabled .stage-threshold-label { color: #6B7B5E; }
body.stage-advanced .stage-threshold { background: #E8EDF2; border-color: var(--c-border); }
body.stage-advanced .stage-threshold-label { color: var(--c-accent); }
body.stage-advanced .stage-threshold-title { color: var(--c-text); }

/* ---- Stage accordion colour coding (course index) ---- */
.stage-details[data-stage="beginner"] .stage-toggle { color: var(--w-accent); }
.stage-details[data-stage="beginner"] .stage-label { color: var(--w-accent); }
.stage-details[data-stage="beginner"] .module-card-code { color: var(--w-accent); }

.stage-details[data-stage="enabled"] .stage-toggle { color: #6B7B5E; }
.stage-details[data-stage="enabled"] .stage-label { color: #6B7B5E; }
.stage-details[data-stage="enabled"] .module-card-code { color: #6B7B5E; }
.stage-details[data-stage="enabled"] .stage-summary:hover .stage-toggle { border-color: #6B7B5E; background: #F2F4EF; }

.stage-details[data-stage="advanced"] .stage-toggle { color: var(--c-accent); }
.stage-details[data-stage="advanced"] .stage-label { color: var(--c-accent); }
.stage-details[data-stage="advanced"] .module-card-code { color: var(--c-accent); }
.stage-details[data-stage="advanced"] .stage-summary:hover .stage-toggle { border-color: var(--c-accent); background: var(--c-accent-light); }

/* ---- Module page header (sticky) ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--w-bg);
  border-bottom: 1px solid var(--w-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
}

.site-logo {
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--w-muted);
  text-decoration: none;
}

.site-header-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-header-link {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--w-muted);
  text-decoration: none;
}

.site-header-link:hover { color: var(--w-text); }

.site-header-cta {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--w-accent);
  text-decoration: none;
  border: 1px solid var(--w-border);
  padding: 0.4rem 1rem;
  border-radius: 3px;
  transition: border-color 0.15s, background 0.15s;
}

.site-header-cta:hover {
  border-color: var(--w-accent);
  background: var(--w-accent-light);
}

@media (max-width: 480px) {
  .site-header { padding: 0.85rem 1rem; }
  .site-header-link { display: none; }
}

/* ---- Module nav bar (stage + progress strip) ---- */
.module-nav-bar {
  background: var(--w-bg-card);
  border-bottom: 1px solid var(--w-border);
  padding: 0.6rem 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--w-faint);
}

.module-nav-bar a {
  color: var(--w-muted);
  text-decoration: none;
}

.module-nav-bar a:hover { color: var(--w-accent); }

.module-nav-bar .sep {
  color: var(--w-faint);
}

/* ---- Page layout ---- */
.module-page main {
  padding-bottom: var(--space-2xl);
}

/* ---- Module hero / intro ---- */
.module-hero {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--w-border);
}

/* ---- Eyebrow label ---- */
.module-eyebrow {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--w-muted);
  margin-bottom: var(--space-sm);
  font-variant: small-caps;
}

/* ---- Module title ---- */
.module-title {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: normal;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  color: var(--w-text);
}

/* ---- Learning objective ---- */
.module-objective {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--w-muted);
  max-width: 56ch;
  line-height: 1.65;
}

/* ---- Module body prose ---- */
.module-body {
  padding-top: var(--space-lg);
}

.module-body h2 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  color: var(--w-text);
  margin-top: 2.5rem;
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.module-body h2:first-child {
  margin-top: 0;
}

.module-body h3 {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: normal;
  color: var(--w-text);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.module-body p {
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--w-text);
  margin-bottom: var(--space-md);
  max-width: 65ch;
}

.module-body p strong { font-weight: 600; }
.module-body p em { font-style: italic; }

.module-body ul,
.module-body ol {
  margin: var(--space-md) 0;
  padding-left: 1.5rem;
  max-width: 62ch;
}

.module-body li {
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--w-text);
  margin-bottom: 0.35rem;
}

.module-body li strong { font-weight: 600; }

.module-body hr {
  border: none;
  border-top: 1px solid var(--w-border);
  margin: var(--space-xl) 0;
}

/* ---- Inline code ---- */
.module-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: 3px;
  padding: 0.1em 0.4em;
}

/* ---- Fenced code blocks ---- */
.module-body pre {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  margin: var(--space-md) 0;
  overflow-x: auto;
  max-width: 100%;
}

.module-body pre code {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: none;
  border: none;
  padding: 0;
  color: var(--c-text);
  line-height: 1.7;
}

/* ---- Blockquotes — "what you type to the AI" ---- */
.module-body blockquote {
  background: var(--c-bg);
  border: none;
  border-left: 3px solid var(--c-accent);
  border-radius: 0;
  padding: 1.5rem 1.75rem;
  margin: var(--space-lg) 0;
  max-width: none;
  position: relative;
}

.module-body blockquote::before {
  content: 'prompt';
  display: block;
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.75rem;
}

.module-body blockquote p {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--c-text);
  line-height: 1.7;
  margin: 0;
  max-width: none;
}

.module-body blockquote p + p {
  margin-top: 0.75rem;
}

/* ---- Keynote line ---- */
.keynote {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  font-style: italic;
  line-height: 1.5;
  color: var(--w-accent);
  max-width: 52ch;
  margin: var(--space-xl) 0;
  padding: 0;
}

/* ---- Human voice ---- */
.human-voice {
  font-family: var(--serif);
  font-style: italic;
  color: var(--w-muted);
}

/* ---- Hide redundant first HR in module body ---- */
.module-body > hr:first-child {
  display: none;
}

/* ---- Copy–Personalise–Use starter block ---- */
.copy-personalise-use {
  background: var(--w-bg-card);
  border: 1px solid var(--w-border);
  border-left: 3px solid var(--w-accent);
  border-radius: 0 4px 4px 0;
  padding: 1.25rem 1.5rem;
  margin: var(--space-lg) 0;
  max-width: 680px;
}

.copy-personalise-use-label {
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--w-accent);
  margin-bottom: 0.75rem;
}

.copy-personalise-use blockquote {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
}

.copy-personalise-use blockquote p {
  font-family: var(--mono);
  font-size: 0.83rem;
  color: var(--c-text);
}

/* ---- Tables (verb reference etc.) ---- */
.module-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-family: var(--sans);
  font-size: 0.88rem;
}

.module-body th {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--w-muted);
  background: var(--w-bg-card);
  border: 1px solid var(--w-border);
  padding: 0.6rem 1rem;
  text-align: left;
  font-weight: 500;
}

.module-body td {
  border: 1px solid var(--w-border);
  padding: 0.7rem 1rem;
  vertical-align: top;
  line-height: 1.55;
  color: var(--w-text);
}

.module-body tr:nth-child(even) td {
  background: var(--w-bg-card);
}

/* ---- Module prev/next navigation ---- */
.module-pagination {
  border-top: 2px solid var(--w-border);
  padding: var(--space-xl) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  margin-top: var(--space-2xl);
}

.module-pagination-prev,
.module-pagination-next {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-decoration: none;
}

.module-pagination-next {
  text-align: right;
}

.module-pagination-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--w-faint);
}

.module-pagination-title {
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--w-accent);
  line-height: 1.3;
}

.module-pagination-prev:hover .module-pagination-title,
.module-pagination-next:hover .module-pagination-title {
  color: var(--w-accent-soft);
}

.module-pagination-spacer {
  flex: 1;
}

/* ---- Footer ---- */
.site-footer {
  padding: var(--space-xl) 0;
  text-align: center;
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--w-faint);
  border-top: 1px solid var(--w-border);
}

/* ---- Course index — stage sections ---- */
.course-hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--w-border);
}

.course-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: normal;
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.course-hero p {
  color: var(--w-muted);
  font-size: 1.05rem;
  max-width: 52ch;
}

.course-stage {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--w-border);
}

.course-stage:last-of-type { border-bottom: none; }

.stage-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--w-muted);
  margin-bottom: var(--space-sm);
}

.course-stage h2 {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: normal;
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.stage-intro {
  color: var(--w-muted);
  font-size: 0.95rem;
  max-width: 56ch;
  margin-bottom: var(--space-xl);
  font-family: var(--sans);
}

/* ---- Module list / cards ---- */
.module-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--w-border);
  border-radius: 4px;
  overflow: hidden;
}

.module-card {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--w-border);
  text-decoration: none;
  background: var(--w-bg);
  transition: background 0.15s, padding-left 0.15s;
}

.module-card:last-child { border-bottom: none; }

.module-card:hover {
  background: var(--w-accent-light);
  padding-left: 1.5rem;
}

.module-card-code {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--w-accent);
  min-width: 2.8rem;
  flex-shrink: 0;
}

.module-card-body {
  flex: 1;
}

.module-card-title {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--w-text);
  line-height: 1.3;
  margin-bottom: 0.15rem;
}

.module-card-objective {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--w-muted);
  line-height: 1.5;
}

/* ---- Collapsible stage sections ---- */
.stage-details {
  width: 100%;
  border: 1px solid var(--w-border);
  border-radius: 6px;
  margin-bottom: 1.25rem;
  background: var(--w-bg-card);
}

.stage-summary {
  list-style: none;
  cursor: pointer;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  user-select: none;
  border-radius: 6px;
  transition: background 0.15s;
}

.stage-summary:hover { background: var(--w-accent-light); }
.stage-details[open] > .stage-summary { border-bottom: 1px solid var(--w-border); border-radius: 6px 6px 0 0; }
.stage-summary::-webkit-details-marker { display: none; }

.stage-summary-text {
  flex: 1;
}

.stage-summary-text .stage-label {
  margin-bottom: 0.15rem;
}

.stage-summary-text h2 {
  margin: 0;
}

.stage-summary-text .stage-intro {
  margin-top: 0.35rem;
  font-size: 0.9rem;
  color: var(--w-muted);
}

.stage-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--w-accent);
  border: 1px solid var(--w-border);
  background: var(--w-bg);
  padding: 0.35rem 0.85rem;
  border-radius: 4px;
  white-space: nowrap;
  transition: border-color 0.15s, background 0.15s;
}

.stage-summary:hover .stage-toggle {
  border-color: var(--w-accent);
  background: var(--w-accent-light);
}

.stage-toggle-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}

.stage-details[open] .stage-toggle-arrow {
  transform: rotate(180deg);
}

.stage-details[open] .stage-toggle-label::before { content: 'Collapse'; }
.stage-toggle-label::before { content: 'Expand'; }

.stage-details > .module-list,
.stage-details > .callout-note {
  padding: 1.25rem 1.5rem 0.5rem;
}

.stage-details > .module-list:last-child,
.stage-details > .callout-note + .module-list {
  padding-bottom: 1rem;
}

.module-count {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--w-faint);
  letter-spacing: 0.05em;
  margin-left: 0.75rem;
  vertical-align: middle;
}

/* ---- Callout note ---- */
.callout-note {
  background: var(--w-bg-card);
  border: 1px solid var(--w-border);
  border-radius: 4px;
  padding: 0.85rem 1.25rem;
  margin-bottom: var(--space-xl);
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--w-muted);
  line-height: 1.6;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .module-pagination {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .module-pagination-next { text-align: left; }
  .module-pagination-spacer { display: none; }

  .module-card {
    flex-direction: column;
    gap: 0.25rem;
  }
}