/* ── Brand color tokens (FSI-optimized Microsoft palette) ── */
:root {
  --brand-primary:      #0078D4;
  --brand-primary-dark: #005A9E;
  --brand-accent:       #007A7E;
  --brand-accent-vivid: #00B7C3;
  --brand-surface:      #F3F2F1;
  --brand-text:         #201F1E;
  --brand-subtle:       #605E5C;
}

/* ── Light mode Material overrides ── */
[data-md-color-scheme="default"] {
  --md-primary-fg-color:        var(--brand-primary);
  --md-primary-fg-color--light: #2B88D8;
  --md-primary-fg-color--dark:  var(--brand-primary-dark);
  --md-accent-fg-color:         var(--brand-accent);
  --md-default-bg-color:        #FFFFFF;
}

/* ── Dark mode Material overrides ── */
[data-md-color-scheme="slate"] {
  --md-primary-fg-color:        #429CE3;
  --md-accent-fg-color:         #3DD6E0;
  --md-default-bg-color:        #1B1A19;
  --brand-primary:              #429CE3;
  --brand-primary-dark:         #005A9E;
  --brand-accent:               #3DD6E0;
  --brand-surface:              #2D2C2B;
  --brand-text:                 #F3F2F1;
  --brand-subtle:               #A19F9D;
}

/* ── Hero section ── */
.hero {
  padding: 4rem 2rem;
  text-align: center;
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  color: #fff;
  border-radius: 8px;
  margin-bottom: 2rem;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #fff;
}
.hero p {
  font-size: 1.1rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0.75rem auto 1.5rem;
}
[data-md-color-scheme="slate"] .hero {
  background: linear-gradient(135deg, #005A9E 0%, #003A70 100%);
}

/* ── Hero button overrides (scoped) ── */
.hero .md-button--primary {
  background-color: #fff !important;
  color: var(--brand-primary) !important;
  border-color: transparent !important;
  font-weight: 600;
}
.hero .md-button--primary:hover {
  background-color: var(--brand-surface) !important;
}
.hero .md-button:not(.md-button--primary) {
  border-color: rgba(255,255,255,0.6) !important;
  color: #fff !important;
}

/* ── Metrics strip ── */
.metrics-strip {
  display: flex;
  justify-content: center;
  gap: 3rem;
  padding: 2rem 1rem;
  background: var(--brand-surface);
  border-radius: 8px;
  margin: 0 0 0.5rem;
}
.metric { text-align: center; }
.metric-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--brand-primary);
}
.metric-label {
  font-size: 0.9rem;
  color: var(--brand-subtle);
}
.metrics-regulations {
  text-align: center;
  color: var(--brand-subtle);
  margin-top: 0;
  margin-bottom: 2rem;
  font-size: 0.9rem;
}

/* ── Architecture diagram ── */
.arch-diagram {
  max-width: 720px;
  margin: 1.5rem auto 2rem;
}
.arch-layer {
  background: var(--brand-surface);
  border-radius: 8px;
  padding: 1rem 1rem 1.25rem;
  text-align: center;
}
.arch-label {
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brand-subtle);
  margin-bottom: 0.75rem;
}
.arch-row {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.arch-card {
  min-width: 120px;
  flex: 1 1 120px;
  max-width: 160px;
  padding: 0.75rem 0.5rem;
  border-radius: 6px;
  font-size: 0.85rem;
  line-height: 1.3;
  text-align: center;
  color: #fff;
}
.arch-card strong { display: block; margin-bottom: 0.15rem; }
.arch-zone   { background: var(--brand-primary); }
.arch-pillar { background: var(--brand-accent); }
.arch-reg    { background: var(--brand-primary-dark); }
.arch-arrow {
  text-align: center;
  font-size: 1.5rem;
  line-height: 1;
  padding: 0.4rem 0;
  color: var(--brand-subtle);
}

/* ── Metadata field spacing ── */
.md-typeset p > strong:first-child {
  color: var(--md-primary-fg-color);
}
.md-typeset br + strong {
  display: inline-block;
  margin-top: 0.4em;
  color: var(--md-primary-fg-color);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero { padding: 2.5rem 1rem; }
  .hero h1 { font-size: 1.75rem; }
  .hero p { font-size: 1rem; }
  .metrics-strip { flex-wrap: wrap; gap: 1.5rem; }
  .metric-number { font-size: 2rem; }
  .arch-card { min-width: 80px; max-width: 140px; font-size: 0.8rem; }
}

/* Print-friendly checkbox styles */
@media print {
  .md-typeset .task-list-indicator::before {
    border: 1px solid #999;
  }
  .md-typeset [type="checkbox"]:checked + .task-list-indicator::before {
    background-color: #999;
  }
}

/* Solution metadata badges */
.solution-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

/* Domain grouping headers */
.md-typeset .domain-header {
  border-bottom: 2px solid var(--md-primary-fg-color);
  padding-bottom: 0.25rem;
  margin-top: 1.5rem;
}