/* ============================================================
   guide.css — Shared styles for all guide/article pages
   Pixel to Print | XCreativeDesign | MIT License
   ============================================================ */

/* ── Breadcrumb ─────────────────────────────────────────── */
.breadcrumb-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  padding: 10px 0;
}

.breadcrumb-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.breadcrumb {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: 6px;
  color: var(--border-strong);
}

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

.breadcrumb a:hover { color: var(--brand-primary); }
.breadcrumb li[aria-current="page"] { color: var(--text-secondary); font-weight: 500; }

/* ── Guide Hero ─────────────────────────────────────────── */
.guide-hero {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.guide-hero-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.guide-hero h1 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: var(--space-md) 0;
}

.guide-hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: var(--space-lg);
}

.guide-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* ── Guide Layout (TOC + Content) ───────────────────────── */
.guide-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

/* ── Table of Contents ──────────────────────────────────── */
.guide-toc {
  position: sticky;
  top: 80px;
}

.toc-inner {
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
}

.toc-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  counter-reset: toc;
}

.toc-list li { counter-increment: toc; }

.toc-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  line-height: 1.4;
  transition: background var(--duration), color var(--duration);
}

.toc-list a::before {
  content: counter(toc);
  font-size: 10px;
  font-family: 'DM Mono', monospace;
  color: var(--text-muted);
  min-width: 14px;
  flex-shrink: 0;
  margin-top: 1px;
}

.toc-list a:hover {
  background: var(--bg-subtle);
  color: var(--brand-primary);
  text-decoration: none;
}

/* ── Guide Content ──────────────────────────────────────── */
.guide-content {
  min-width: 0;
}

.guide-content section {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-default);
}

.guide-content section:last-child {
  border-bottom: none;
}

/* Scroll margin for anchor links — clears sticky header */
.guide-content section[id] {
  scroll-margin-top: 80px;
}

.guide-content h2 {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 0 0 var(--space-lg);
}

.guide-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin: var(--space-xl) 0 var(--space-sm);
}

.guide-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin: 0 0 var(--space-md);
}

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

.guide-content a {
  color: var(--brand-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
}

.guide-content a:hover { text-decoration: none; }

.guide-content strong { color: var(--text-primary); font-weight: 600; }
.guide-content em { font-style: italic; color: var(--text-secondary); }

/* ── Nav link active state ──────────────────────────────── */
.nav-link--active {
  color: var(--brand-primary) !important;
  background: rgba(26,110,255,0.08) !important;
  font-weight: 600;
}

/* ── Callout boxes ──────────────────────────────────────── */
.guide-callout {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  font-size: 14px;
  line-height: 1.65;
}

.guide-callout strong { font-weight: 700; }

.callout-icon {
  font-size: 18px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.guide-callout--blue {
  background: rgba(26,110,255,0.05);
  border: 1px solid rgba(26,110,255,0.18);
  color: var(--text-secondary);
}
.guide-callout--blue strong { color: var(--brand-primary); }

.guide-callout--green {
  background: rgba(0,135,90,0.05);
  border: 1px solid rgba(0,135,90,0.18);
  color: var(--text-secondary);
}
.guide-callout--green strong { color: #00875A; }

.guide-callout--orange {
  background: rgba(217,119,6,0.06);
  border: 1px solid rgba(217,119,6,0.2);
  color: var(--text-secondary);
}
.guide-callout--orange strong { color: #D97706; }

/* ── Formula box ────────────────────────────────────────── */
.guide-formula-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--brand-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
}

.formula {
  font-size: 15px;
  font-weight: 700;
  font-family: 'DM Mono', monospace;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.formula-example {
  font-size: 13px;
  font-family: 'DM Mono', monospace;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.formula-source {
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 4px;
}

/* ── Example box ────────────────────────────────────────── */
.guide-example-box {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-lg) 0;
}

.example-box-title {
  padding: 10px var(--space-lg);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-default);
}

.example-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.example-cell {
  padding: var(--space-lg);
  background: var(--bg-surface);
  text-align: center;
}

.example-cell:first-child {
  border-right: 1px solid var(--border-default);
}

.example-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.example-value {
  font-size: 18px;
  font-weight: 800;
  font-family: 'DM Mono', monospace;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.example-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.example-result {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-primary);
  background: rgba(26,110,255,0.07);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.example-caption {
  padding: var(--space-md) var(--space-lg);
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border-top: 1px solid var(--border-default);
  margin: 0;
  line-height: 1.5;
}

/* ── Tables ─────────────────────────────────────────────── */
.guide-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  margin: var(--space-lg) 0;
  -webkit-overflow-scrolling: touch;
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.guide-table thead {
  background: var(--bg-subtle);
}

.guide-table th {
  padding: 10px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-default);
  white-space: nowrap;
}

.guide-table td {
  padding: 12px 16px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-default);
  line-height: 1.5;
  vertical-align: top;
}

.guide-table tbody tr:last-child td {
  border-bottom: none;
}

.guide-table tbody tr:hover {
  background: var(--bg-subtle);
}

.td-highlight {
  font-family: 'DM Mono', monospace;
  font-weight: 700;
  color: var(--brand-primary) !important;
  font-size: 13px;
}

.td-mono {
  font-family: 'DM Mono', monospace;
  font-weight: 600;
  color: var(--text-primary) !important;
}

/* ── PPQS Factors ───────────────────────────────────────── */
.ppqs-factors {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.ppqs-factor {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
}

.ppqs-factor-num {
  font-size: 32px;
  font-weight: 800;
  font-family: 'DM Mono', monospace;
  color: var(--border-strong);
  line-height: 1;
  flex-shrink: 0;
  letter-spacing: -0.04em;
  min-width: 48px;
}

.ppqs-factor h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-sm) !important;
}

.ppqs-factor p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0 !important;
}

/* ── CTA box ────────────────────────────────────────────── */
.guide-cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  margin-top: var(--space-xl);
  font-size: 15px;
  color: var(--text-secondary);
}

.guide-cta-box strong { color: var(--text-primary); }

.guide-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--brand-primary);
  color: #fff !important;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-decoration: none !important;
  white-space: nowrap;
  transition: background var(--duration), transform var(--duration);
  flex-shrink: 0;
}

.guide-cta-btn:hover {
  background: var(--brand-secondary);
  transform: translateY(-1px);
  text-decoration: none !important;
}

/* ── Related grid ───────────────────────────────────────── */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.related-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: box-shadow var(--duration), transform var(--duration);
}

.related-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}

.related-icon {
  font-size: 24px;
  line-height: 1;
  flex-shrink: 0;
}

.related-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.related-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .guide-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .guide-toc {
    position: static;
  }

  .toc-inner {
    padding: var(--space-md);
  }

  .toc-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
  }

  .toc-list a {
    padding: 4px 8px;
    font-size: 12px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-full);
  }

  .toc-list a::before { display: none; }

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

@media (max-width: 768px) {
  .guide-hero { padding: var(--space-2xl) 0 var(--space-xl); }
  .guide-hero-inner { padding: 0 var(--space-md); }
  .guide-layout { padding: var(--space-lg) var(--space-md); }
  .breadcrumb-inner { padding: 0 var(--space-md); }

  .guide-cta-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .example-grid { grid-template-columns: 1fr; }
  .example-cell:first-child { border-right: none; border-bottom: 1px solid var(--border-default); }

  .ppqs-factor { flex-direction: column; gap: var(--space-sm); }
  .ppqs-factor-num { font-size: 24px; }
}

@media (max-width: 480px) {
  .guide-table th,
  .guide-table td { padding: 10px 12px; font-size: 13px; }
}