/* =============================================================================
 * Periphery Guide Layout
 * -----------------------------------------------------------------------------
 * Layout primitives unique to multi-page guide pages: sidebar, sidebar-nav,
 * chapter-pager, chapter-list cards, changelog entries.
 *
 * Loaded ALONGSIDE design-system.css (which must be linked first).
 * Uses Periphery brand tokens — no duplication of base styles.
 * ============================================================================= */

/* === LAYOUT === */
body.guide-page {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}
@media (max-width: 720px) {
  body.guide-page { grid-template-columns: 1fr; }
  .guide-sidebar { position: relative; height: auto; }
}

/* === SIDEBAR === */
.guide-sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background: var(--color-inkwell);
  color: var(--color-white);
  padding: 32px 0 24px;
  font-family: var(--font-body);
}
.guide-sidebar .sb-brand {
  padding: 0 24px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 16px;
}
.guide-sidebar .sb-eyebrow {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-lime);
  margin-bottom: 4px;
}
.guide-sidebar .sb-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
  color: var(--color-white);
}
.guide-sidebar .sb-subtitle {
  font-family: var(--font-body);
  font-size: 12px;
  color: rgba(255,255,255,0.6);
  margin-top: 6px;
  line-height: 1.4;
}
.guide-sidebar .sb-version {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 10px;
  background: rgba(255,255,255,0.12);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.guide-sidebar .sb-nav-label {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  padding: 0 24px;
  margin: 24px 0 8px;
}
.guide-sidebar ol, .guide-sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.guide-sidebar li a {
  display: block;
  padding: 8px 24px 8px 28px;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  border-left: 3px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.guide-sidebar li a:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.04);
}
.guide-sidebar li a.active {
  color: var(--color-white);
  background: rgba(82, 41, 211, 0.18);
  border-left-color: var(--color-purple);
  font-weight: 500;
}
.guide-sidebar .sb-counter {
  display: inline-block;
  width: 22px;
  margin-right: 8px;
  color: rgba(255,255,255,0.4);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
}
.guide-sidebar .sb-tools {
  margin-top: 24px;
  padding: 24px 24px 0;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.guide-sidebar .sb-tools a {
  display: block;
  padding: 8px 0;
  color: rgba(255,255,255,0.6);
  font-size: 13px;
  text-decoration: none;
}
.guide-sidebar .sb-tools a:hover { color: var(--color-white); }
.guide-sidebar .sb-tools a.active {
  color: var(--color-white);
  font-weight: 500;
}

/* === SECTION-GROUPED SIDEBAR (used when manifest has sections:) === */
.guide-sidebar .nav-section { margin-bottom: 4px; }
.guide-sidebar .nav-section-header {
  display: flex;
  align-items: center;
  padding: 10px 24px;
  cursor: pointer;
  color: rgba(255,255,255,0.6);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  user-select: none;
}
.guide-sidebar .nav-section-header:hover { color: rgba(255,255,255,0.9); }
.guide-sidebar .nav-section-header .chevron {
  margin-left: auto;
  font-size: 10px;
  transition: transform 0.2s;
}
.guide-sidebar .nav-section.collapsed .chevron { transform: rotate(-90deg); }
.guide-sidebar .nav-section.collapsed .nav-items { display: none; }

/* === MAIN CONTENT === */
.guide-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.guide-main .header-band .eyebrow {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-lime);
  margin-bottom: 8px;
}
.guide-main .article {
  flex: 1;
}
.guide-main .article .lead {
  font-size: var(--fs-body-lg);
  color: var(--color-stone);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

/* === CHAPTER PAGER === */
.chapter-pager {
  display: flex;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6) var(--space-6);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-body);
  gap: var(--space-4);
}
.chapter-pager a {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-inkwell);
  max-width: 45%;
}
.chapter-pager a:hover .pager-title { color: var(--color-purple); }
.chapter-pager .pager-label {
  font-size: 12px;
  color: var(--color-stone);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.chapter-pager .pager-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
}
.chapter-pager .pager-next {
  text-align: right;
  margin-left: auto;
}
.chapter-pager .pager-next .pager-title::after { content: " \2192"; }
.chapter-pager .pager-prev .pager-title::before { content: "\2190 "; }

/* === CHAPTER LIST (index page) === */
.chapter-list { margin: var(--space-5) 0; }
.chapter-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}
.chapter-card {
  background: var(--color-row-alt);
  padding: var(--space-4);
  text-decoration: none;
  color: var(--color-inkwell);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-top: 1px solid var(--color-inkwell);
}
.chapter-card:hover { background: #E5E5F5; }
.chapter-card .ch-num {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-stone);
}
.chapter-card .ch-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
}
.chapter-card .ch-desc {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--color-stone);
  line-height: 1.5;
}

/* === CHANGELOG === */
.cl-entries { margin-top: var(--space-5); }
.cl-entry {
  padding-top: var(--space-5);
  margin-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}
.cl-entry:first-child { border-top: 0; padding-top: 0; margin-top: 0; }
.cl-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.cl-v {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  color: var(--color-inkwell);
}
.cl-date {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--color-stone);
}
.cl-current {
  display: inline-block;
  padding: 2px 10px;
  background: var(--color-purple);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.cl-summary {
  font-size: 16px;
  margin-bottom: var(--space-3);
  color: var(--color-inkwell);
}
.cl-section { margin-bottom: var(--space-3); }
.cl-section-label {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-stone);
  margin-bottom: var(--space-2);
}
.cl-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.cl-section li {
  padding: var(--space-1) 0 var(--space-1) var(--space-3);
  position: relative;
  font-size: 14px;
  line-height: 1.5;
}
.cl-section li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 8px;
  height: 1px;
  background: var(--color-stone);
}

/* === PRINT === */
@media print {
  body.guide-page { grid-template-columns: 1fr; }
  .guide-sidebar { display: none; }
  .chapter-pager { display: none; }
}