/* ════════════════════════════════════════════════════════════════════
   explainer.css — base (light) styles for the module explainer pages.
   Pairs with style.css, which supplies the dark-theme overrides for
   these same class names (.section-nav, .concept-card, .callout, etc.).
   ════════════════════════════════════════════════════════════════════ */

/* ── Sticky section pill nav ── */
.section-nav {
  position: sticky; top: 0; z-index: 90;
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 12px 0;
  background: rgba(248,249,251,.92);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}
.section-nav button {
  font-family: 'Open Sans', sans-serif;
  font-size: 13px; font-weight: 600;
  padding: 8px 15px; border-radius: 999px;
  background: var(--bg-white); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer;
  transition: all .2s var(--ease);
}
.section-nav button:hover { border-color: var(--border-hover); color: var(--green); }
.section-nav button.active {
  background: var(--gradient-green); color: #fff; border-color: transparent;
  box-shadow: 0 2px 12px rgba(9,114,211,.28);
}

/* ── Concept cards ── */
.concept-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 18px; margin: 20px 0; }
.concept-card {
  background: linear-gradient(145deg, #F0F7FF 0%, #FFFFFF 60%);
  border: 1.5px solid rgba(9,114,211,.14);
  border-radius: 16px; padding: 22px;
  position: relative; overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s ease;
}
.concept-card::after {
  content: ''; position: absolute; bottom: -30px; right: -30px;
  width: 100px; height: 100px;
  background: radial-gradient(circle, rgba(9,114,211,.05) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.concept-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(9,114,211,.10); border-color: rgba(9,114,211,.28); }
.concept-card .cc-icon {
  font-size: 24px; width: 48px; height: 48px; border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(9,114,211,.08); margin-bottom: 12px;
}
.concept-card h4 { font-family: 'Open Sans', sans-serif; font-size: 15.5px; color: var(--text-heading); margin: 0 0 8px; font-weight: 700; }
.concept-card p { font-size: 13.5px; color: var(--text-body); margin: 0; line-height: 1.65; }
.concept-card p + p { margin-top: 8px; }

/* Colour variants */
.concept-card.blue   { background: linear-gradient(145deg, #EFF6FF 0%, #FFFFFF 60%); border-color: rgba(37,99,235,.14); }
.concept-card.blue .cc-icon   { background: rgba(37,99,235,.08); }
.concept-card.violet { background: linear-gradient(145deg, #F5F3FF 0%, #FFFFFF 60%); border-color: rgba(139,92,246,.14); }
.concept-card.violet .cc-icon { background: rgba(139,92,246,.08); }
.concept-card.amber  { background: linear-gradient(145deg, #FFFBEB 0%, #FFFFFF 60%); border-color: rgba(217,119,6,.14); }
.concept-card.amber .cc-icon  { background: rgba(217,119,6,.08); }
.concept-card.green  { background: linear-gradient(145deg, #EFF6FF 0%, #FFFFFF 60%); border-color: rgba(9,114,211,.14); }
.concept-card.green .cc-icon  { background: rgba(9,114,211,.08); }
.concept-card.red    { background: linear-gradient(145deg, #FEF2F2 0%, #FFFFFF 60%); border-color: rgba(220,38,38,.14); }
.concept-card.red .cc-icon    { background: rgba(220,38,38,.08); }

/* ── Callouts ── */
.callout {
  border-radius: 12px; padding: 16px 20px; margin: 18px 0;
  border: 1px solid rgba(9,114,211,.20);
  background: rgba(9,114,211,.05);
  color: var(--text-body); font-size: 14px; line-height: 1.7;
}
.callout .callout-label {
  display: block; font-family: 'Open Sans', sans-serif; font-weight: 700;
  font-size: 12px; letter-spacing: .5px; text-transform: uppercase;
  color: var(--green); margin-bottom: 6px;
}
.callout strong { color: var(--text-heading); }
.callout.blue   { background: rgba(37,99,235,.06);  border-color: rgba(37,99,235,.22); }
.callout.blue .callout-label   { color: #2563EB; }
.callout.amber  { background: rgba(217,119,6,.07);  border-color: rgba(217,119,6,.25); }
.callout.amber .callout-label  { color: #D97706; }
.callout.red    { background: rgba(220,38,38,.06);  border-color: rgba(220,38,38,.25); }
.callout.red .callout-label    { color: #DC2626; }
.callout.violet { background: rgba(139,92,246,.06); border-color: rgba(139,92,246,.25); }
.callout.violet .callout-label { color: #7C3AED; }

/* ── Key-insight banner ── */
.key-insight {
  display: flex; gap: 14px; align-items: flex-start;
  background: linear-gradient(135deg, #EFF6FF, #F2F8FD);
  border: 1px solid rgba(9,114,211,.18);
  border-radius: 12px; padding: 16px 20px; margin: 20px 0;
}
.key-insight .ki-ico { font-size: 22px; flex-shrink: 0; }
.key-insight p { margin: 0; font-size: 14px; color: var(--text-body); }
.key-insight strong { color: var(--green); }

/* ── Code blocks (dark in both themes — style.css keeps them dark) ── */
.code-block {
  background: #0F172A; color: #E2E8F0;
  border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; margin: 16px 0;
  font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 12.5px; line-height: 1.7;
  overflow-x: auto; white-space: pre;
}
.code-block .c-key { color: #93C5FD; }
.code-block .c-str { color: #6EE7B7; }
/* Code blocks are dark in BOTH themes, so this needs one value that clears AA
   on the dark block surface. #64748B measured 3.75:1 on #0F172A. */
.code-block .c-cmt { color: #8C9BB0; font-style: italic; }
.code-label {
  font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 10.5px; font-weight: 600;
  letter-spacing: .5px; text-transform: uppercase; color: var(--text-muted);
  margin: 16px 0 -6px;
}

/* ── Compare table ── */
.compare-table { width: 100%; border-collapse: separate; border-spacing: 0; margin: 16px 0; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
.compare-table th { background: var(--bg-hero); color: #fff; padding: 11px 15px; text-align: left; font-size: 12.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .4px; }
.compare-table td { padding: 11px 15px; border-top: 1px solid var(--border); font-size: 13.5px; color: var(--text-body); vertical-align: top; }
.compare-table tr:hover td { background: var(--green-glow); }

/* ── Split responsibility columns ── */
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 18px 0; }
@media (max-width: 720px){ .split-2 { grid-template-columns: 1fr; } }
.split-col { border-radius: 14px; padding: 20px; border: 1px solid var(--border); }
.split-col h4 { font-family: 'Open Sans', sans-serif; font-size: 14px; margin: 0 0 12px; display: flex; align-items: center; gap: 8px; }
.split-col ul { margin: 0 0 0 4px; padding: 0; list-style: none; }
.split-col li { font-size: 13.5px; padding: 6px 0 6px 22px; position: relative; color: var(--text-body); }
.split-col li::before { content: '▹'; position: absolute; left: 0; color: currentColor; opacity: .6; }
.split-col.aws  { background: linear-gradient(145deg, #EFF6FF 0%, #FFFFFF 65%); border-color: rgba(37,99,235,.18); }
.split-col.aws h4  { color: #2563EB; }
.split-col.you  { background: linear-gradient(145deg, #FFF4EC 0%, #FFFFFF 65%); border-color: rgba(236,114,17,.20); }
.split-col.you h4  { color: #EC7211; }

/* ── Pipeline / flow chips ── */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 10px; margin: 20px 0; }
.flow-step {
  flex: 1 1 150px; min-width: 140px;
  background: var(--bg-white); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 16px; position: relative;
}
.flow-step .fs-n { font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 11px; font-weight: 700; color: var(--green); }
.flow-step h5 { font-family: 'Open Sans', sans-serif; font-size: 13.5px; margin: 4px 0 4px; color: var(--text-heading); }
.flow-step p { font-size: 12px; color: var(--text-muted); margin: 0; line-height: 1.5; }
.flow-arrow { align-self: center; color: var(--text-dim); font-weight: 800; font-size: 18px; }
@media (max-width: 640px){ .flow-arrow { transform: rotate(90deg); } }

/* ── Domain badge (which surface a section covers) ── */
.surface-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--green-glow); color: var(--green);
  font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 10.5px; font-weight: 600;
  letter-spacing: .4px; padding: 4px 11px; border-radius: 999px;
  border: 1px solid rgba(9,114,211,.18); margin-bottom: 10px;
}

/* ── Prev / next page nav ── */
.page-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--border); }
.page-nav a { color: var(--green); text-decoration: none; font-size: 14px; font-weight: 600; padding: 12px 18px; border-radius: 10px; background: var(--green-glow); border: 1px solid rgba(9,114,211,.14); transition: all .25s var(--ease); max-width: 48%; }
.page-nav a:hover { background: var(--green-glow-strong); border-color: var(--border-hover); }
.page-nav a.nav-prev::before { content: '← '; }
.page-nav a.nav-next::after { content: ' →'; }
.page-nav .pn-label { display: block; font-size: 11px; color: var(--text-muted); font-weight: 500; margin-bottom: 2px; }
.page-nav a.nav-next { text-align: right; margin-left: auto; }

/* ── Sources footer ── */
.sources {
  margin-top: 28px; padding: 20px 22px; border-radius: 12px;
  background: var(--bg-white); border: 1px solid var(--border);
}
.sources h4 { font-family: 'Open Sans', sans-serif; font-size: 13px; text-transform: uppercase; letter-spacing: .6px; color: var(--text-muted); margin: 0 0 10px; }
.sources ul { margin: 0; padding-left: 18px; }
.sources li { font-size: 12.5px; color: var(--text-muted); margin-bottom: 5px; line-height: 1.55; }
.sources a { color: var(--green); text-decoration: none; }
.sources a:hover { text-decoration: underline; }

/* ── Inline code ── */
code { background: rgba(9,114,211,.08); color: #0972D3; font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 90%; padding: 2px 6px; border-radius: 5px; }

/* Section-scoped panels */
.panel { display: none; }
.panel.active { display: block; animation: fadeInUp .4s var(--ease) both; }

/* ── Sub-heading within a panel ── */
.sub-head { font-family: 'Open Sans', sans-serif; font-size: 16px; font-weight: 700; color: var(--text-heading); margin: 26px 0 4px; }

/* ── Module tag inside concept cards (global; index.html styles its own copy inline) ── */
.concept-card .dc-mod { font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 10.5px; color: var(--green); font-weight: 600; }

/* ── "demoed" pill next to a heading ── */
.badge-demo {
  font-family: 'JetBrains Mono', Monaco, Menlo, Consolas, monospace; font-size: 9.5px; font-weight: 700;
  letter-spacing: .4px; text-transform: uppercase;
  color: #EC7211; background: rgba(236,114,17,.10);
  border: 1px solid rgba(236,114,17,.22); border-radius: 999px;
  padding: 2px 8px; margin-left: 6px; vertical-align: middle;
}