/* ============================================================
   Route Optimization — Site Stylesheet
   Elegant light theme inspired by maps/routes/compliance.
============================================================ */

:root {
  /* Brand palette */
  --c-bg:           #f6f8fb;
  --c-bg-elev:     #ffffff;
  --c-surface:    #ffffff;
  --c-surface-2:  #eef2f7;
  --c-border:     #d8e0ea;
  --c-border-soft:#e6ecf3;

  --c-text:       #102a43;
  --c-text-soft:  #3b4d65;
  --c-text-mute:  #5b6d83;

  --c-primary:    #0f766e;       /* teal-700 */
  --c-primary-2:  #0e7490;       /* cyan-700 */
  --c-accent:     #0ea5e9;       /* sky-500 */
  --c-accent-2:   #6366f1;       /* indigo-500 */
  --c-warn:       #f59e0b;
  --c-danger:     #ef4444;
  --c-success:    #10b981;
  --c-violet:     #a78bfa;

  --c-code-bg:        #f1f5fa;
  --c-code-inline-bg: #eaf0f7;
  --c-code-fg:        #1f2d44;

  --c-link:        #0e7490;
  --c-link-hover:  #0f766e;

  /* Layout */
  --header-h:    72px;
  --maxw-page:   1440px;
  --maxw-prose:  78ch;
  --maxw-wide:   1180px;

  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 2px rgba(16,42,67,0.05), 0 1px 1px rgba(16,42,67,0.04);
  --shadow:    0 6px 18px rgba(16,42,67,0.08), 0 2px 4px rgba(16,42,67,0.04);
  --shadow-lg: 0 22px 48px rgba(16,42,67,0.14), 0 4px 12px rgba(16,42,67,0.06);

  --t-fast: 120ms ease;
  --t-base: 200ms ease;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

/* ----------- Reset / base ----------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--c-text);
  overflow-x: hidden;
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(14,165,233,0.07), transparent 70%),
    radial-gradient(1000px 600px at -10% 10%, rgba(15,118,110,0.07), transparent 70%),
    var(--c-bg);
}

img, svg { max-width: 100%; height: auto; display: block; }

a {
  color: var(--c-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}
a:hover, a:focus-visible {
  color: var(--c-link-hover);
  border-bottom-color: currentColor;
  outline: none;
}

:focus-visible {
  outline: 3px solid rgba(14,165,233,0.45);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ----------- Layout containers ----------- */
.shell {
  width: 100%;
  max-width: var(--maxw-page);
  margin: 0 auto;
  padding: 0 28px;
}

main.content-main {
  flex: 1 1 auto;
  width: 100%;
  padding: 32px 0 64px;
}

.page-wide {
  width: 100%;
  max-width: var(--maxw-wide);
  margin: 0 auto;
}

/* ----------- Header / nav ----------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--header-h);
  background: rgba(255,255,255,0.86);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border-soft);
}
.site-header .shell {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-text);
  border-bottom: 0;
}
.brand:hover { color: var(--c-primary); border-bottom: 0; }
.brand-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base);
}
.brand:hover .brand-mark { transform: translateY(-1px) rotate(-3deg); }
.brand-text {
  display: flex; flex-direction: column; line-height: 1;
}
.brand-text .brand-title { font-size: 16px; }
.brand-text .brand-tag   { font-size: 11px; color: var(--c-text-mute); font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; margin-top: 3px;}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  color: var(--c-text-soft);
  border-bottom: 0;
}
.nav a:hover, .nav a:focus-visible {
  background: var(--c-surface-2);
  color: var(--c-primary);
  border-bottom: 0;
}
.nav a.is-current {
  background: linear-gradient(135deg, rgba(14,165,233,0.12), rgba(15,118,110,0.12));
  color: var(--c-primary);
}
.nav a svg { width: 18px; height: 18px; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  padding: 9px 11px;
  border-radius: 10px;
  cursor: pointer;
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 6px; }
  .nav {
    position: absolute;
    top: 100%;
    right: 16px;
    left: 16px;
    background: var(--c-surface);
    box-shadow: var(--shadow);
    border: 1px solid var(--c-border-soft);
    padding: 8px;
    border-radius: var(--radius);
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { width: 100%; }
}

/* ----------- Footer ----------- */
.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, #ffffff 0%, #eef3f8 100%);
  border-top: 1px solid var(--c-border-soft);
  padding: 36px 0 28px;
  font-size: 14.5px;
  color: var(--c-text-soft);
}
.site-footer .shell { display: grid; gap: 24px; grid-template-columns: 1.2fr 1fr 1fr 1fr; }
.site-footer h4 {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--c-text);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.site-footer a { color: var(--c-text-soft); }
.site-footer a:hover { color: var(--c-primary); }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.footer-brand-text { font-weight: 800; color: var(--c-text); }
.footer-legal { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--c-border-soft); color: var(--c-text-mute); font-size: 13px;}

@media (max-width: 820px) {
  .site-footer .shell { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  .site-footer .shell { grid-template-columns: 1fr; }
}

/* ============================================================
   Frontpage (hero + sections)
============================================================ */
.hero {
  position: relative;
  padding: 56px 0 40px;
}
.hero-grid {
  display: grid;
  gap: 40px;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, rgba(14,165,233,0.15), rgba(15,118,110,0.15));
  color: var(--c-primary);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(28px, 4.6vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--c-text);
  overflow-wrap: anywhere;
  word-break: break-word;
}
@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
}
.hero h1 .grad {
  background: linear-gradient(135deg, #0f766e 0%, #0ea5e9 60%, #6366f1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lede {
  font-size: 19px;
  color: var(--c-text-soft);
  line-height: 1.65;
  margin: 0 0 26px;
  max-width: 64ch;
}
.hero-art {
  display: grid;
  place-items: center;
  position: relative;
}
.hero-art svg {
  width: min(100%, 360px);
  filter: drop-shadow(0 20px 40px rgba(15,118,110,0.18));
  animation: floaty 8s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art svg { width: min(82vw, 280px); }
}

/* CTA buttons */
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; }
.cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base), color var(--t-base);
}
.cta:hover, .cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--c-accent);
  color: var(--c-primary);
}
.cta .cta-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: grid; place-items: center;
  color: #fff;
  flex: 0 0 36px;
}
.cta .cta-label { font-size: 15px; }
.cta .cta-sub   { font-size: 12px; color: var(--c-text-mute); font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
.cta-text { display: flex; flex-direction: column; line-height: 1.15; gap: 4px; }

/* Distinct icon backgrounds per section */
.cta-icon.is-vrp        { background: linear-gradient(135deg, #0ea5e9, #6366f1); }
.cta-icon.is-telematics { background: linear-gradient(135deg, #10b981, #0ea5e9); }
.cta-icon.is-core       { background: linear-gradient(135deg, #f59e0b, #ef4444); }

/* Description paragraphs on home */
.intro-grid {
  display: grid;
  gap: 22px;
  margin: 48px 0 8px;
  grid-template-columns: repeat(2, 1fr);
}
.intro-grid p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--c-text-soft);
}
@media (max-width: 820px) {
  .intro-grid { grid-template-columns: 1fr; }
}

/* Section cards on the home page */
.section-block {
  margin-top: 64px;
}
.section-title {
  font-size: clamp(24px, 2.4vw, 30px);
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--c-text);
}
.section-title .grad {
  background: linear-gradient(135deg, #0f766e, #0ea5e9 60%, #6366f1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-subtitle {
  color: var(--c-text-mute);
  margin: 0 0 22px;
  font-size: 15.5px;
}

.cards {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 980px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 22px;
  border-radius: var(--radius);
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
  text-decoration: none;
  color: inherit;
  border-bottom: 0;
}
.card:hover, .card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--c-accent);
  border-bottom: 0;
}
.card .card-icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid; place-items: center;
  color: #fff;
  margin-bottom: 14px;
}
.card h3 {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--c-text);
  letter-spacing: -0.005em;
}
.card p {
  margin: 0;
  color: var(--c-text-soft);
  font-size: 14.5px;
  line-height: 1.55;
}
.card .card-arrow {
  margin-top: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-link);
  display: inline-flex; align-items: center; gap: 6px;
  letter-spacing: 0.02em;
}
.card:hover .card-arrow { color: var(--c-primary); }

/* Per-card accent strips */
.card.is-vrp        .card-icon { background: linear-gradient(135deg, #0ea5e9, #6366f1); }
.card.is-telematics .card-icon { background: linear-gradient(135deg, #10b981, #0ea5e9); }
.card.is-core       .card-icon { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.card.is-leaf       .card-icon { background: linear-gradient(135deg, #06b6d4, #0f766e); }

/* ============================================================
   Article (content) pages
============================================================ */
.article {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  width: 100%;
  max-width: var(--maxw-wide);
  margin: 0 auto;
}
.article-header {
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--c-border);
  margin-bottom: 8px;
}
.article-meta { color: var(--c-text-mute); font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }
.article h1 {
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 6px 0 12px;
  background: linear-gradient(135deg, #0f766e 0%, #0ea5e9 65%, #6366f1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.article .prose {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  max-width: none;
}
.article .prose > * { max-width: 100%; }

.article .prose h2,
.article .prose h3,
.article .prose h4 {
  letter-spacing: -0.01em;
  margin-top: 1.9em;
  margin-bottom: 0.4em;
  line-height: 1.25;
  color: var(--c-text);
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.article .prose h2 {
  font-size: 1.55em;
  padding-left: 14px;
  border-left: 5px solid;
  border-image: linear-gradient(180deg, #0ea5e9, #6366f1) 1;
}
.article .prose h3 { font-size: 1.28em; color: var(--c-primary-2); }
.article .prose h4 { font-size: 1.1em; color: var(--c-text-soft); text-transform: uppercase; letter-spacing: 0.05em; }

.article .prose p { margin: 0.9em 0; }

.article .prose a.anchor-link {
  border-bottom: 0;
  color: inherit;
}
.article .prose a.anchor-link:hover { color: var(--c-primary); border-bottom: 0; }

.article .prose ul, .article .prose ol {
  padding-left: 1.4em;
  margin: 0.6em 0 1em;
}
.article .prose li { margin: 0.25em 0; }

/* Inline code */
.article .prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--c-code-inline-bg);
  color: var(--c-code-fg);
  padding: 0.12em 0.42em;
  border-radius: 5px;
  border: none;
}

/* Task lists — remove default bullet, render real checkbox */
.article .prose ul.contains-task-list,
.article .prose ul .task-list-item,
.article .prose ul li.task-list-item {
  list-style: none;
  padding-left: 0;
}
.article .prose ul.contains-task-list { padding-left: 0.25em; }
.article .prose li.task-list-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 10px;
  border-radius: 8px;
  transition: background-color var(--t-fast);
}
.article .prose li.task-list-item:hover { background: var(--c-surface-2); }
.article .prose li.task-list-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px; height: 18px;
  flex: 0 0 18px;
  margin-top: 5px;
  border: 2px solid var(--c-border);
  border-radius: 5px;
  background: var(--c-surface);
  cursor: pointer;
  display: inline-grid;
  place-content: center;
  position: relative;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}
.article .prose li.task-list-item input[type="checkbox"]:hover { border-color: var(--c-accent); }
.article .prose li.task-list-item input[type="checkbox"]:checked {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  border-color: transparent;
}
.article .prose li.task-list-item input[type="checkbox"]:checked::after {
  content: "";
  width: 10px; height: 5px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg) translate(1px, -1px);
}
.article .prose li.task-list-item.is-done > *:not(input) { text-decoration: line-through; color: var(--c-text-mute); }
.article .prose li.task-list-item.is-done { color: var(--c-text-mute); }

/* Block quotes */
.article .prose blockquote {
  margin: 1.4em 0;
  padding: 0.6em 1em;
  background: var(--c-surface-2);
  border-left: 4px solid var(--c-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-soft);
}

/* Tables */
.article .prose .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius);
  background: var(--c-surface);
  margin: 1.2em 0;
}
.article .prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  min-width: 480px;
}
.article .prose thead { background: var(--c-surface-2); }
.article .prose th, .article .prose td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--c-border-soft);
}
.article .prose tr:last-child td { border-bottom: 0; }
.article .prose th { font-weight: 700; color: var(--c-text); }

/* Horizontal rule */
.article .prose hr {
  border: none;
  height: 1px;
  background: var(--c-border);
  margin: 2em 0;
}

/* ============================================================
   Code blocks (Prism light theme + copy button)
============================================================ */
.article .prose pre,
.code-block {
  position: relative;
  background: var(--c-code-bg);
  color: var(--c-code-fg);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius);
  padding: 18px 18px;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.65;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.6);
}
.article .prose pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* Copy button */
.code-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text-soft);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transition: opacity var(--t-fast), color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.article .prose pre:hover .code-copy-btn,
.article .prose pre:focus-within .code-copy-btn,
.code-copy-btn:focus-visible { opacity: 1; }
.code-copy-btn:hover { color: var(--c-primary); border-color: var(--c-accent); }
.code-copy-btn.is-copied { color: var(--c-success); border-color: var(--c-success); }

/* ============================================================
   Prism syntax highlighting — bespoke light palette
============================================================ */
code[class*="language-"], pre[class*="language-"] {
  color: #1f2d44;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 14px;
  text-shadow: none;
  hyphens: none;
}
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata { color: #6b7c93; font-style: italic; }
.token.punctuation { color: #475569; }
.token.namespace { opacity: 0.7; }
.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted { color: #b45309; }
.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted { color: #0f766e; }
.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string { color: #0e7490; background: transparent; }
.token.atrule,
.token.attr-value,
.token.keyword { color: #6366f1; font-weight: 600; }
.token.function,
.token.class-name { color: #0369a1; }
.token.regex,
.token.important,
.token.variable { color: #be185d; }
.token.important, .token.bold { font-weight: 700; }
.token.italic { font-style: italic; }

/* ============================================================
   Breadcrumbs
============================================================ */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  font-size: 13px;
  color: var(--c-text-mute);
  margin: 4px 0 6px;
  font-weight: 600;
}
.crumbs a {
  color: var(--c-text-soft);
  border-bottom: 0;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--c-surface-2);
}
.crumbs a:hover { color: var(--c-primary); background: var(--c-surface); border-bottom: 0; }
.crumbs .sep { color: var(--c-text-mute); padding: 4px 0; }
.crumbs .current { color: var(--c-text); padding: 4px 0; }

/* ============================================================
   Related links / siblings
============================================================ */
.related-block {
  margin-top: 56px;
  padding: 24px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #ffffff 0%, #f1f7fd 100%);
  border: 1px solid var(--c-border-soft);
}
.related-block h3 {
  margin: 0 0 14px;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-primary);
}
.related-list {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, 1fr);
  padding: 0;
  list-style: none;
}
@media (max-width: 720px) { .related-list { grid-template-columns: 1fr; } }
.related-list a {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  color: var(--c-text);
  font-weight: 600;
}
.related-list a:hover { background: linear-gradient(135deg, #eefcfa, #eff6ff); border-color: var(--c-accent); color: var(--c-primary); border-bottom: 0; }
.related-list a::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  flex: 0 0 8px;
}

/* ============================================================
   FAQ / Frequently Asked accordion
============================================================ */
details.faq {
  border: 1px solid var(--c-border-soft);
  border-radius: 12px;
  background: var(--c-surface);
  padding: 0;
  margin: 10px 0;
  overflow: hidden;
  transition: box-shadow var(--t-base), border-color var(--t-base);
}
details.faq[open] { box-shadow: var(--shadow-sm); border-color: var(--c-accent); }
details.faq > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 18px 14px 44px;
  font-weight: 700;
  color: var(--c-text);
  position: relative;
}
details.faq > summary::-webkit-details-marker { display: none; }
details.faq > summary::before {
  content: "+";
  position: absolute;
  left: 14px; top: 50%;
  transform: translateY(-50%);
  width: 22px; height: 22px;
  display: grid; place-items: center;
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(14,165,233,0.15), rgba(15,118,110,0.15));
  color: var(--c-primary);
  font-weight: 700;
  transition: transform var(--t-base);
}
details.faq[open] > summary::before { content: "−"; transform: translateY(-50%) rotate(180deg); }
details.faq > summary:hover { background: var(--c-surface-2); }
details.faq > .faq-body {
  padding: 4px 18px 16px;
  color: var(--c-text-soft);
}

/* ============================================================
   Mermaid wrapper
============================================================ */
.mermaid-wrap {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius);
  padding: 18px;
  margin: 1.2em 0;
  overflow-x: auto;
}
pre.mermaid {
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
  font-family: var(--font-mono);
  white-space: pre;
}

/* ============================================================
   Small utilities
============================================================ */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  border: 0; clip: rect(0,0,0,0);
  overflow: hidden;
}