/* =============================================
   Decision-Centred Thinking and Modelling
   Custom stylesheet — full replacement
   ============================================= */

/* === TYPOGRAPHY === */
body {
  font-family: 'Georgia', 'Times New Roman', serif;
  font-size: 16px;
  line-height: 1.75;
  color: #1a1a2e;
}

h1, h2, h3, h4, h5 {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-weight: 600;
  color: #0f3460;
}

/* === SIDEBAR === */
#quarto-sidebar {
  background-color: #fafbfc;
  border-right: 1px solid #dde6ef;
}

.sidebar-item .chapter-number,
.sidebar-item .chapter-sep {
  display: none;
}

.sidebar-item-text {
  padding-left: 0 !important;
}

.sidebar-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: #0f3460;
  line-height: 1.3;
}

.sidebar-item-text {
  font-size: 0.8rem;
}

/* === HERO: works within book layout column, 
         no viewport-width overflow needed === */
.dcm-hero-wrap {
  background: linear-gradient(150deg, 
    #0a1628 0%, 
    #0d2a4a 35%, 
    #0f3460 65%, 
    #1a1a2e 100%);
  color: white;
  padding: 4.5rem 3rem 4rem 3rem;
  margin: -1.5rem -1.5rem 2.5rem -1.5rem;
  position: relative;
  overflow: hidden;
  border-radius: 0 0 8px 8px;
}

.dcm-hero-wrap::after {
  content: '';
  position: absolute;
  top: -20%;
  right: 5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    rgba(93,173,226,0.18) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.dcm-hero-tag {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  margin-bottom: 1rem;
}

.dcm-hero-title {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 300;
  color: white;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem 0;
}

.dcm-hero-title strong {
  font-weight: 800;
  color: #5dade2;
  display: block;
}

.dcm-hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.72);
  max-width: 580px;
  line-height: 1.75;
  margin-bottom: 1.8rem;
}

.dcm-hero-motto {
  font-size: 0.92rem;
  font-style: italic;
  color: rgba(255,255,255,0.5);
  border-left: 3px solid #5dade2;
  padding-left: 1rem;
  margin-bottom: 2.2rem;
  max-width: 480px;
}

.dcm-btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: 4px;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-weight: 600;
  font-size: 0.86rem;
  text-decoration: none !important;
  margin-right: 0.6rem;
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
}

.dcm-btn-primary {
  background: #5dade2;
  color: #0a1628 !important;
}

.dcm-btn-secondary {
  background: transparent;
  color: rgba(255,255,255,0.85) !important;
  border: 1.5px solid rgba(255,255,255,0.4);
}

/* === QUESTIONS BLOCK === */
.dcm-q-block {
  background: linear-gradient(135deg, #eef2f8 0%, #e4ecf6 100%);
  border-radius: 8px;
  padding: 2.2rem 2.2rem 1rem 2.2rem;
  margin: 2.5rem 0;
}

.dcm-q-label {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #0f3460;
  margin-bottom: 1.5rem;
}

.dcm-q-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.6rem;
}

.dcm-q-circle {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  min-width: 2rem;
  background: #0f3460;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 0.2rem;
}

.dcm-q-content {
  font-size: 0.95rem;
  color: #1a2a3a;
  line-height: 1.7;
}

/* === PILLAR GRID === */
.dcm-pillar-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin: 2rem 0;
}

.dcm-pillar-card {
  background: #f8fafc;
  border: 1px solid #dde6ef;
  border-top: 3px solid #0f3460;
  padding: 1.3rem;
  border-radius: 0 0 6px 6px;
}

.dcm-pillar-card h3 {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 800;
  color: #0f3460;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 0.6rem 0;
}

.dcm-pillar-card p {
  font-size: 0.86rem;
  color: #4a5568;
  line-height: 1.65;
  margin: 0;
}

/* === AUDIENCE STRIP === */
.dcm-audience-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem 0;
}

.dcm-audience-item {
  padding: 1rem 1.1rem;
  border-radius: 6px;
  background: white;
  border: 1px solid #dde6ef;
  border-left: 3px solid #5dade2;
}

.dcm-audience-item h4 {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 800;
  color: #0f3460;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.4rem 0;
}

.dcm-audience-item p {
  font-size: 0.82rem;
  color: #555;
  margin: 0;
  line-height: 1.5;
}

/* === STATS GRID === */
.dcm-stats-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 1.5rem 0 2rem 0;
}

@media (max-width: 650px) {
  .dcm-stats-wrap { grid-template-columns: repeat(2, 1fr); }
  .dcm-q-row { flex-direction: column; }
}

.dcm-stat-item {
  text-align: center;
  padding: 1.4rem 0.5rem;
  border-radius: 6px;
  border: 1px solid #dde6ef;
  background: #fafbfd;
}

.dcm-stat-n {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: #0f3460;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.dcm-stat-l {
  font-size: 0.75rem;
  color: #6b7a8d;
  line-height: 1.4;
}

/* === CALLOUTS === */
.callout-note {
  background-color: #f0f4f8;
  border-left: 4px solid #0f3460;
  border-radius: 0 6px 6px 0;
}

.callout-tip {
  background-color: #f0faf4;
  border-left: 4px solid #27ae60;
}

.callout-important {
  background-color: #fff8f0;
  border-left: 4px solid #e67e22;
}

/* === TABLES === */
table {
  font-size: 0.88rem;
  width: 100%;
  border-collapse: collapse;
}
thead tr {
  background-color: #0f3460;
  color: white;
}
thead th { padding: 0.6rem 0.8rem; text-align: left; }
tbody td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid #e8edf3;
  vertical-align: top;
}
tbody tr:nth-child(even) { background: #f7f9fc; }
tbody tr:hover { background: #edf2f9; }

/* === BLOCKQUOTES === */
blockquote {
  background: #f0f4f8;
  border-left: 4px solid #0f3460;
  padding: 1rem 1.4rem;
  margin: 1.5rem 0;
  border-radius: 0 6px 6px 0;
  font-style: normal;
  color: #0f3460;
}

/* === DISCUSS STRIP === */
.dcm-discuss-strip {
  border: 1px solid #dde6ef;
  border-left: 4px solid #5dade2;
  background: #f4f9ff;
  border-radius: 0 6px 6px 0;
  padding: 0.9rem 1.2rem;
  margin-top: 2.5rem;
  font-size: 0.86rem;
  color: #444;
}

.dcm-discuss-strip a {
  color: #0f3460;
  font-weight: 600;
}

/* === CODE === */
pre {
  background: #1a1a2e;
  color: #e8f0fb;
  padding: 1rem;
  border-radius: 6px;
  font-size: 0.84rem;
}

/* === NAVIGATION FOOTER === */
.nav-footer {
  border-top: 1px solid #dde6ef;
  background: #f8fafc;
  font-size: 0.78rem;
  color: #777;
}

/* ============================================
   MARGIN NOTES (Distill-style aside elements)
   ============================================ */

.column-margin {
  font-size: 0.78rem;
  color: #6b7a8d;
  line-height: 1.55;
  padding: 0.5rem 0;
  border-left: 2px solid #dde6ef;
  padding-left: 0.75rem;
}

.column-margin strong {
  color: #0f3460;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.25rem;
}

/* Compact Node Declaration for margin use */
.node-margin {
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: 0.7rem;
  color: #6b7a8d;
  background: #f8fafc;
  border: 1px solid #dde6ef;
  border-left: 3px solid #0f3460;
  padding: 0.5rem 0.75rem;
  border-radius: 0 4px 4px 0;
  margin-bottom: 0.5rem;
}

/* Math display block styling */
.math.display {
  background: #f8fafc;
  padding: 1rem 1.5rem;
  border-radius: 6px;
  border-left: 3px solid #5dade2;
  margin: 1.25rem 0;
  overflow-x: auto;
}

/* Suppress Quarto auto-title on landing page.
   Hero banner provides the title instead. */
#title-block-header.quarto-title-block {
  display: none !important;
}
.quarto-title-block {
  display: none !important;
}