/* ==========================================================================
   pdVerse Design Planning Reader & Hub Styles
   ========================================================================== */

:root {
  --dp-navy: #1F3855;
  --dp-charcoal: #333333;
  --dp-teal: #3A8774;
  --dp-mustard: #DAA53A;
  --dp-red: #B34045;
  --dp-bg-soft: #F8F9FA;
  --dp-border: #E2E8F0;
  --dp-card-bg: #FFFFFF;
  --dp-text: #334155;
  --dp-heading: #0F172A;
  --dp-code-bg: #F1F5F9;
  --dp-accent: #059669;
  --dp-accent-hover: #047857;
  --dp-accent-light: #ECFDF5;
}

[data-theme="dark"] {
  --dp-navy: #93C5FD;
  --dp-charcoal: #E2E8F0;
  --dp-teal: #34D399;
  --dp-mustard: #FBBF24;
  --dp-red: #F87171;
  --dp-bg-soft: #0F172A;
  --dp-border: #334155;
  --dp-card-bg: #1E293B;
  --dp-text: #CBD5E1;
  --dp-heading: #F8FAFC;
  --dp-code-bg: #0B1120;
  --dp-accent: #10B981;
  --dp-accent-hover: #34D399;
  --dp-accent-light: rgba(16, 185, 129, 0.15);
}

/* --------------------------------------------------------------------------
   Sticky Chapter Reading Toolbar
   -------------------------------------------------------------------------- */
.dp-reading-toolbar {
  position: sticky;
  top: 68px;
  z-index: 950;
  background: var(--dp-card-bg);
  border-bottom: 1px solid var(--dp-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(12px);
  padding: 8px 16px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.dp-toolbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.dp-toolbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 240px;
}

.dp-toolbar-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--dp-accent-light);
  color: var(--dp-accent);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 8px;
  border-radius: 6px;
  white-space: nowrap;
}

.dp-toolbar-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--dp-heading);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 420px;
}

.dp-toolbar-toc-select {
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--dp-text);
  background: var(--dp-bg-soft);
  border: 1px solid var(--dp-border);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  outline: none;
  max-width: 200px;
}

.dp-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dp-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.dp-btn-sm {
  padding: 4px 10px;
  font-size: 0.8rem;
}

.dp-btn-primary {
  background: linear-gradient(135deg, #15803d, #047857);
  color: #ffffff !important;
  box-shadow: 0 2px 6px rgba(21, 128, 61, 0.25);
}

.dp-btn-primary:hover {
  background: linear-gradient(135deg, #166534, #065f46);
  transform: translateY(-1px);
}

.dp-btn-outline {
  background: transparent;
  color: var(--dp-heading);
  border-color: var(--dp-border);
}

.dp-btn-outline:hover {
  background: var(--dp-bg-soft);
  border-color: var(--dp-accent);
  color: var(--dp-accent);
}

.dp-btn-ghost {
  background: var(--dp-bg-soft);
  color: var(--dp-text);
}

.dp-btn-ghost:hover {
  background: var(--dp-border);
  color: var(--dp-heading);
}

/* --------------------------------------------------------------------------
   Reading Container & Chapter Body Overrides
   -------------------------------------------------------------------------- */
.dp-reading-wrapper {
  background: var(--dp-bg-soft);
  min-height: 100vh;
  padding: 24px 16px 60px 16px;
}

.dp-reading-container {
  max-width: 920px;
  margin: 0 auto;
  background: var(--dp-card-bg);
  border: 1px solid var(--dp-border);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
  padding: 40px 48px;
  color: var(--dp-text);
  font-size: 10.5pt;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .dp-reading-wrapper {
    padding: 12px 8px 40px 8px;
  }
  .dp-reading-container {
    padding: 24px 18px;
    border-radius: 12px;
  }
  .dp-toolbar-title {
    max-width: 180px;
  }
}

/* Dark mode compatibility for book chapter elements */
[data-theme="dark"] .dp-reading-container {
  color: #CBD5E1;
}

[data-theme="dark"] .dp-reading-container h1,
[data-theme="dark"] .dp-reading-container h2,
[data-theme="dark"] .dp-reading-container h3,
[data-theme="dark"] .dp-reading-container h4 {
  color: #F8FAFC !important;
}

[data-theme="dark"] .dp-reading-container p.chapno {
  color: #34D399 !important;
}

[data-theme="dark"] .dp-reading-container .takeaway,
[data-theme="dark"] .dp-reading-container div.takeaway {
  background: #0F291E !important;
  border-left-color: #10B981 !important;
  color: #A7F3D0 !important;
}

[data-theme="dark"] .dp-reading-container .mentor,
[data-theme="dark"] .dp-reading-container div.mentor {
  background: #172554 !important;
  border-left-color: #60A5FA !important;
  color: #BFDBFE !important;
}

[data-theme="dark"] .dp-reading-container .warning,
[data-theme="dark"] .dp-reading-container div.warning {
  background: #2D1515 !important;
  border-left-color: #F87171 !important;
  color: #FECACA !important;
}

[data-theme="dark"] .dp-reading-container table {
  border-color: #334155 !important;
}

[data-theme="dark"] .dp-reading-container th {
  background: #0B1120 !important;
  color: #F8FAFC !important;
  border-color: #334155 !important;
}

[data-theme="dark"] .dp-reading-container td {
  border-color: #334155 !important;
  color: #CBD5E1 !important;
}

[data-theme="dark"] .dp-reading-container tr:nth-child(even) td {
  background: #1E293B !important;
}

[data-theme="dark"] .dp-reading-container pre,
[data-theme="dark"] .dp-reading-container code {
  background: #0B1120 !important;
  color: #E2E8F0 !important;
  border-color: #334155 !important;
}

[data-theme="dark"] .dp-reading-container img {
  border-radius: 8px;
  background: #FFFFFF; /* High-contrast background for technical vector SVGs */
  padding: 8px;
}

/* Ensure images fit cleanly */
.dp-reading-container img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 16px auto;
}

/* --------------------------------------------------------------------------
   Floating Quick-Action Download Pill
   -------------------------------------------------------------------------- */
.dp-floating-download {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 990;
  display: flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #15803d, #047857);
  color: #FFFFFF !important;
  padding: 10px 18px;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(21, 128, 61, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.dp-floating-download:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 30px rgba(21, 128, 61, 0.5);
  background: linear-gradient(135deg, #166534, #065f46);
}

.dp-floating-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 800;
}

@media (max-width: 600px) {
  .dp-floating-download {
    bottom: 16px;
    right: 16px;
    padding: 8px 14px;
    font-size: 0.8rem;
  }
  .dp-floating-badge {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Chapter Navigation & Bottom Download Promo Card
   -------------------------------------------------------------------------- */
.dp-chapter-footer-nav {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px dashed var(--dp-border);
}

.dp-nav-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 36px;
}

@media (max-width: 640px) {
  .dp-nav-grid {
    grid-template-columns: 1fr;
  }
}

.dp-nav-card {
  display: flex;
  flex-direction: column;
  padding: 16px 20px;
  background: var(--dp-bg-soft);
  border: 1px solid var(--dp-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.dp-nav-card:hover {
  border-color: var(--dp-accent);
  background: var(--dp-accent-light);
  transform: translateY(-2px);
}

.dp-nav-card.dp-prev {
  text-align: left;
}

.dp-nav-card.dp-next {
  text-align: right;
  margin-left: auto;
  width: 100%;
}

.dp-nav-direction {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--dp-accent);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.dp-nav-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dp-heading);
}

.dp-download-promo-card {
  background: linear-gradient(135deg, #0F172A, #1E293B);
  border: 1px solid #334155;
  border-radius: 16px;
  padding: 32px;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.dp-promo-content {
  flex: 1 1 300px;
}

.dp-promo-badge {
  display: inline-block;
  background: #10B981;
  color: #064E3B;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 12px;
}

.dp-promo-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin: 0 0 8px 0;
  color: #FFFFFF !important;
}

.dp-promo-desc {
  font-size: 0.95rem;
  color: #94A3B8;
  margin: 0;
  line-height: 1.5;
}

.dp-promo-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* --------------------------------------------------------------------------
   Hub Page Styling
   -------------------------------------------------------------------------- */
.dp-hub-hero {
  padding: 60px 16px 40px 16px;
  background: var(--dp-bg-soft);
  border-bottom: 1px solid var(--dp-border);
  text-align: center;
}

.dp-hub-hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.dp-hub-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--dp-accent-light);
  color: var(--dp-accent);
  font-size: 0.85rem;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: 9999px;
  margin-bottom: 20px;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.dp-hub-title {
  font-family: Outfit, Inter, sans-serif;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  color: var(--dp-heading);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 16px 0;
}

.dp-hub-lead {
  font-size: 1.15rem;
  color: var(--dp-text);
  line-height: 1.6;
  max-width: 760px;
  margin: 0 auto 28px auto;
}

.dp-hub-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.dp-stats-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--dp-border);
}

.dp-stat-item strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--dp-heading);
  font-family: Outfit, Inter, sans-serif;
}

.dp-stat-item span {
  font-size: 0.85rem;
  color: var(--dp-text);
  font-weight: 600;
}

.dp-hub-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 16px;
}

.dp-part-section {
  margin-bottom: 50px;
}

.dp-part-header {
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--dp-border);
}

.dp-part-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--dp-heading);
  margin: 0;
}

.dp-chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

@media (max-width: 480px) {
  .dp-chapters-grid {
    grid-template-columns: 1fr;
  }
}

.dp-chapter-card {
  background: var(--dp-card-bg);
  border: 1px solid var(--dp-border);
  border-radius: 14px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  transition: all 0.2s ease;
}

.dp-chapter-card:hover {
  border-color: var(--dp-accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.dp-card-top {
  margin-bottom: 16px;
}

.dp-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--dp-accent);
  margin-bottom: 8px;
}

.dp-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dp-heading);
  margin: 0 0 10px 0;
  line-height: 1.35;
}

.dp-card-synopsis {
  font-size: 0.9rem;
  color: var(--dp-text);
  line-height: 1.5;
  margin: 0;
}

.dp-card-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--dp-border);
}

.dp-card-actions a {
  flex: 1;
  text-align: center;
}