/* ============================================================
   TOKENS — Ocean Blue Serenity design system
   ============================================================ */
:root {
  --header-height: 64px;

  /* Palette */
  --clr-indigo-950: #06104e;
  --clr-indigo-900: #0d1b6e;
  --clr-indigo-800: #1a237e;
  --clr-indigo-700: #283593;
  --clr-indigo-600: #3949ab;
  --clr-sky-500:   #03a9f4;
  --clr-sky-400:   #29b6f6;
  --clr-sky-300:   #4fc3f7;
  --clr-sky-200:   #81d4fa;
  --clr-sky-100:   #b3e5fc;
  --clr-sky-50:    #e1f5fe;
  --clr-teal-400:  #26c6da;
  --clr-purple-600:#7b1fa2;

  /* Semantic */
  --color-bg:          #f0f8ff;
  --color-surface:     #ffffff;
  --color-surface-alt: #e8f4ff;
  --color-primary:     var(--clr-indigo-800);
  --color-primary-dk:  var(--clr-indigo-900);
  --color-accent:      var(--clr-sky-400);
  --color-accent-lt:   var(--clr-sky-50);
  --color-text:        #0d1b5a;
  --color-text-2:      #2d3d7a;
  --color-text-muted:  #556090;
  --color-border:      #c5d8f5;
  --color-border-lt:   #ddeeff;
  --color-code-bg:     #eef5ff;
  --color-code-text:   #0d3466;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  /* Spacing */
  --sp-1:  0.25rem;  --sp-2:  0.5rem;   --sp-3:  0.75rem;
  --sp-4:  1rem;     --sp-5:  1.25rem;  --sp-6:  1.5rem;
  --sp-8:  2rem;     --sp-10: 2.5rem;   --sp-12: 3rem;
  --sp-16: 4rem;     --sp-20: 5rem;     --sp-24: 6rem;

  /* Shadows */
  --sh-sm: 0 1px 4px rgba(26,35,126,.07);
  --sh-md: 0 4px 14px rgba(26,35,126,.10);
  --sh-lg: 0 8px 28px rgba(26,35,126,.14);
  --sh-xl: 0 16px 48px rgba(26,35,126,.18);

  /* Radii */
  --r-sm: .375rem; --r-md: .5rem; --r-lg: .75rem;
  --r-xl: 1rem;    --r-2xl: 1.5rem; --r-full: 9999px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-base: 250ms ease;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-wrapper { flex: 1 1 auto; }

img, svg { display: block; max-width: 100%; }
a { color: var(--clr-indigo-700); text-decoration: underline; text-decoration-color: var(--color-border); text-underline-offset: .2em; transition: color var(--t-fast), text-decoration-color var(--t-fast); }
a:hover { color: var(--clr-sky-500); text-decoration-color: var(--clr-sky-400); }
a:focus-visible { outline: 2px solid var(--clr-sky-400); outline-offset: 3px; border-radius: 2px; }

/* Heading anchors from markdown-it-anchor */
.header-anchor { text-decoration: none; color: inherit; }
.header-anchor:hover { color: var(--clr-sky-500); }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: min(1400px, 100%);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

@media (min-width: 768px)  { .container { padding-inline: var(--sp-8); } }
@media (min-width: 1200px) { .container { padding-inline: var(--sp-12); } }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: linear-gradient(135deg, var(--clr-indigo-800) 0%, var(--clr-indigo-700) 100%);
  box-shadow: 0 2px 12px rgba(13,27,110,.25);
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--sp-6);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  color: white;
  flex-shrink: 0;
}
.logo-icon { width: 38px; height: 38px; flex-shrink: 0; }
.logo-text { font-size: 1.05rem; font-weight: 400; letter-spacing: -.01em; color: rgba(255,255,255,.9); white-space: nowrap; }
.logo-text strong { font-weight: 700; color: white; }
.site-logo:hover { color: white; text-decoration: none; }
.site-logo:hover .logo-text { color: var(--clr-sky-200); }
.site-logo:focus-visible { outline: 2px solid var(--clr-sky-300); outline-offset: 4px; border-radius: var(--r-sm); }

/* Nav */
.site-nav { margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: var(--sp-1); list-style: none; }
.nav-link {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  color: rgba(255,255,255,.85);
  text-decoration: none;
  font-size: .9rem;
  font-weight: 500;
  border-radius: var(--r-md);
  transition: background var(--t-fast), color var(--t-fast);
}
.nav-link:hover { background: rgba(255,255,255,.12); color: white; text-decoration: none; }
.nav-link--active { background: rgba(41,182,246,.25); color: var(--clr-sky-200); }
.nav-link--active:hover { background: rgba(41,182,246,.35); }
.nav-icon { width: 18px; height: 18px; flex-shrink: 0; }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px; height: 20px;
  background: none; border: none; cursor: pointer;
  padding: 0; flex-shrink: 0;
  margin-left: auto;
}
.nav-toggle-bar { display: block; height: 2px; background: rgba(255,255,255,.9); border-radius: 1px; transition: transform var(--t-base), opacity var(--t-fast); }

@media (max-width: 767px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--clr-indigo-900);
    border-top: 1px solid rgba(255,255,255,.1);
    box-shadow: var(--sh-lg);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--t-base), opacity var(--t-base);
    margin-left: 0;
  }
  .site-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: var(--sp-3); }
  .nav-link { font-size: 1rem; padding: var(--sp-3) var(--sp-4); }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: linear-gradient(160deg, var(--clr-indigo-900) 0%, var(--clr-indigo-950) 100%);
  color: rgba(255,255,255,.8);
  padding: var(--sp-16) 0 var(--sp-8);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-10);
}
@media (min-width: 640px) { .footer-grid { grid-template-columns: 1fr 2fr; } }
@media (min-width: 900px) { .footer-grid { grid-template-columns: 1.2fr 3fr; gap: var(--sp-16); } }

.footer-logo {
  display: flex; align-items: center; gap: var(--sp-3);
  text-decoration: none; color: white; font-weight: 600; font-size: 1rem; margin-bottom: var(--sp-4);
}
.footer-logo:hover { color: var(--clr-sky-200); text-decoration: none; }
.footer-logo-icon { width: 32px; height: 32px; }
.footer-tagline { font-size: .875rem; color: rgba(255,255,255,.55); line-height: 1.55; max-width: 22ch; }

.footer-nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: var(--sp-8); }
.footer-nav-heading { font-size: .7rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--clr-sky-300); margin-bottom: var(--sp-3); }
.footer-nav-section ul { list-style: none; display: flex; flex-direction: column; gap: var(--sp-2); }
.footer-nav-section a { color: rgba(255,255,255,.65); text-decoration: none; font-size: .875rem; transition: color var(--t-fast); }
.footer-nav-section a:hover { color: var(--clr-sky-200); }

.footer-bottom { margin-top: var(--sp-12); padding-top: var(--sp-6); border-top: 1px solid rgba(255,255,255,.1); text-align: center; font-size: .8rem; color: rgba(255,255,255,.4); }

/* ============================================================
   BREADCRUMBS
   ============================================================ */
.breadcrumbs { margin-bottom: var(--sp-6); padding: var(--sp-3) 0; }
.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-1); list-style: none; font-size: .85rem; }
.breadcrumb-link { color: var(--color-text-muted); text-decoration: none; transition: color var(--t-fast); }
.breadcrumb-link:hover { color: var(--clr-indigo-700); }
.breadcrumb-sep { color: var(--color-border); margin-inline: 2px; }
.breadcrumb-current { color: var(--color-text); font-weight: 500; }

/* Anchor offset for sticky header */
h1, h2, h3, h4, h5, h6 { scroll-margin-top: calc(var(--header-height) + 1.5rem); }

/* ============================================================
   HOME PAGE
   ============================================================ */
.hero {
  background: linear-gradient(150deg, var(--clr-indigo-900) 0%, var(--clr-indigo-800) 40%, #004d99 100%);
  color: white;
  padding: clamp(var(--sp-16), 8vw, var(--sp-24)) 0 clamp(var(--sp-12), 6vw, var(--sp-20));
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(41,182,246,.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content { position: relative; }
.hero-label { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--clr-sky-300); margin-bottom: var(--sp-5); background: rgba(41,182,246,.15); padding: var(--sp-1) var(--sp-4); border-radius: var(--r-full); border: 1px solid rgba(41,182,246,.3); }
.hero-title { font-size: clamp(2.4rem, 5.5vw, 4.4rem); font-weight: 800; line-height: 1.05; letter-spacing: -.035em; margin-bottom: var(--sp-6); }
.hero-title-accent { color: var(--clr-sky-300); }
.hero-subtitle { font-size: clamp(1.05rem, 1.8vw, 1.25rem); color: rgba(255,255,255,.82); line-height: 1.65; margin-bottom: var(--sp-8); max-width: 72ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--sp-4); }

.cta-btn {
  display: inline-flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-6);
  background: rgba(255,255,255,.12);
  color: white;
  text-decoration: none;
  border-radius: var(--r-lg);
  font-weight: 600; font-size: .95rem;
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(4px);
  transition: background var(--t-base), transform var(--t-base), box-shadow var(--t-base);
}
.cta-btn:hover { background: rgba(255,255,255,.2); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); color: white; text-decoration: none; }
.cta-btn-icon { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: var(--r-md); flex-shrink: 0; }
.cta-btn--1 .cta-btn-icon { background: rgba(41,182,246,.3); color: var(--clr-sky-200); }
.cta-btn--2 .cta-btn-icon { background: rgba(38,198,218,.3); color: #80deea; }
.cta-btn--3 .cta-btn-icon { background: rgba(186,104,200,.3); color: #e1bee7; }

/* About section */
.home-about { padding: var(--sp-20) 0; background: var(--color-surface); }
.home-about-inner { display: grid; grid-template-columns: 1fr; gap: var(--sp-8); }
@media (min-width: 1024px) {
  .home-about-inner { grid-template-columns: 1fr 1fr; gap: var(--sp-12); align-items: start; }
  .home-about-intro { grid-column: 1; }
  .home-about-body { grid-column: 2; }
}
.section-badge { display: inline-block; font-size: .7rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--clr-indigo-700); background: var(--clr-sky-50); padding: var(--sp-1) var(--sp-3); border-radius: var(--r-full); border: 1px solid var(--color-border); margin-bottom: var(--sp-5); }
.section-title { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 700; letter-spacing: -.025em; color: var(--color-text); margin-bottom: var(--sp-6); line-height: 1.2; }
.home-about p { font-size: 1.05rem; color: var(--color-text-2); line-height: 1.8; margin-bottom: var(--sp-5); }
.home-about p:last-child { margin-bottom: 0; }

/* Pillar cards */
.home-pillars { padding: var(--sp-20) 0; background: var(--color-bg); }
.home-pillars-header { text-align: center; margin-bottom: var(--sp-12); }
.home-pillars-header .section-title { max-width: 600px; margin-inline: auto; margin-bottom: var(--sp-3); }
.home-pillars-header p { color: var(--color-text-muted); font-size: 1rem; }

.pillars-grid { display: grid; gap: var(--sp-6); grid-template-columns: 1fr; }
@media (min-width: 640px)  { .pillars-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .pillars-grid { grid-template-columns: repeat(3, 1fr); } }

.pillar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-lt);
  border-radius: var(--r-xl);
  padding: var(--sp-8);
  text-decoration: none;
  color: inherit;
  display: flex; flex-direction: column;
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
  box-shadow: var(--sh-sm);
}
.pillar-card:hover { transform: translateY(-4px); box-shadow: var(--sh-lg); border-color: var(--color-border); text-decoration: none; color: inherit; }
.pillar-card-icon { width: 52px; height: 52px; border-radius: var(--r-lg); display: flex; align-items: center; justify-content: center; margin-bottom: var(--sp-5); }
.pillar-card--1 .pillar-card-icon { background: linear-gradient(135deg, var(--clr-sky-100), var(--clr-sky-50)); color: var(--clr-indigo-800); }
.pillar-card--2 .pillar-card-icon { background: linear-gradient(135deg, #b2ebf2, #e0f7fa); color: #006064; }
.pillar-card--3 .pillar-card-icon { background: linear-gradient(135deg, #e1bee7, #f3e5f5); color: var(--clr-purple-600); }
.pillar-card-icon svg { width: 28px; height: 28px; }
.pillar-card-title { font-size: 1.2rem; font-weight: 700; color: var(--color-text); margin-bottom: var(--sp-3); line-height: 1.3; }
.pillar-card-desc { font-size: .9rem; color: var(--color-text-muted); line-height: 1.6; flex: 1; margin-bottom: var(--sp-5); }
.pillar-card-arrow { display: inline-flex; align-items: center; gap: var(--sp-2); font-size: .875rem; font-weight: 600; color: var(--clr-indigo-700); margin-top: auto; transition: gap var(--t-fast); }
.pillar-card:hover .pillar-card-arrow { gap: var(--sp-3); }

/* Featured articles */
.home-articles { padding: var(--sp-20) 0; background: var(--color-surface); }
.articles-grid { display: grid; gap: var(--sp-4); grid-template-columns: 1fr; }
@media (min-width: 640px)  { .articles-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .articles-grid { grid-template-columns: repeat(3, 1fr); } }

.article-link-card {
  display: block; padding: var(--sp-5) var(--sp-6);
  background: var(--color-bg); border: 1px solid var(--color-border-lt); border-radius: var(--r-lg);
  text-decoration: none; color: inherit;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}
.article-link-card:hover { border-color: var(--clr-sky-300); box-shadow: var(--sh-md); transform: translateY(-2px); text-decoration: none; color: inherit; }
.article-link-tag { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--color-text-muted); margin-bottom: var(--sp-2); }
.article-link-title { font-size: .95rem; font-weight: 600; color: var(--clr-indigo-800); line-height: 1.4; }
.article-link-card:hover .article-link-title { color: var(--clr-sky-500); }

/* ============================================================
   SECTION PAGES
   ============================================================ */
.section-page { padding: var(--sp-12) 0 var(--sp-16); }
.section-body { margin-bottom: var(--sp-10); overflow-wrap: break-word; word-break: break-word; }
.section-body h1 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 800; letter-spacing: -.03em; color: var(--color-text); margin-bottom: var(--sp-6); line-height: 1.15; border-bottom: 3px solid var(--clr-sky-100); padding-bottom: var(--sp-5); }
.section-body h2 { font-size: 1.5rem; font-weight: 700; color: var(--color-text); margin-top: var(--sp-10); margin-bottom: var(--sp-4); }
.section-body h3 { font-size: 1.2rem; font-weight: 700; color: var(--clr-indigo-700); margin-top: var(--sp-8); margin-bottom: var(--sp-3); }
.section-body p { font-size: 1.025rem; line-height: 1.75; color: var(--color-text); margin-bottom: var(--sp-5); }

/* ============================================================
   CONTENT / ARTICLE PAGES
   ============================================================ */
.content-page { padding: var(--sp-10) 0 var(--sp-16); }

.article-body { margin-bottom: var(--sp-12); overflow-wrap: break-word; word-break: break-word; }

/* Headings */
.article-body h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 800; letter-spacing: -.035em;
  color: var(--color-text); line-height: 1.15;
  margin-bottom: var(--sp-8);
  padding-bottom: var(--sp-5);
  border-bottom: 3px solid var(--clr-sky-100);
  background: linear-gradient(90deg, var(--clr-indigo-800), var(--clr-indigo-600));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.article-body h2 { font-size: 1.65rem; font-weight: 700; color: var(--clr-indigo-800); margin-top: var(--sp-12); margin-bottom: var(--sp-4); line-height: 1.2; padding-bottom: var(--sp-2); border-bottom: 2px solid var(--clr-sky-50); }
.article-body h3 { font-size: 1.25rem; font-weight: 700; color: var(--clr-indigo-700); margin-top: var(--sp-8); margin-bottom: var(--sp-3); }
.article-body h4 { font-size: 1.05rem; font-weight: 700; color: var(--color-text-2); margin-top: var(--sp-6); margin-bottom: var(--sp-2); }
.article-body h5, .article-body h6 { font-size: 1rem; font-weight: 600; color: var(--color-text-muted); margin-top: var(--sp-4); margin-bottom: var(--sp-2); }

/* Paragraphs & prose */
.article-body p, .section-body p { font-size: 1.025rem; line-height: 1.75; color: var(--color-text); margin-bottom: var(--sp-5); }
.article-body strong, .section-body strong { font-weight: 700; color: var(--color-text); }
.article-body em { font-style: italic; }

/* Inline code — blends with prose: no box, no border, body text colour */
.article-body code, .section-body code,
.home-about code, .home-pillars code, .home-articles code,
.faq-answer code, .hero code {
  font-family: var(--font-mono); font-size: .875em;
  background: none; color: var(--color-text);
  border: none; padding: 0;
  overflow-wrap: break-word; word-break: break-word;
}

/* Lists */
.article-body ul, .article-body ol,
.section-body ul, .section-body ol {
  list-style: none;
  padding-left: 0;
  margin-bottom: var(--sp-6);
}

/* Unordered lists — sky-blue dot bullets */
.article-body ul li,
.section-body ul li {
  position: relative;
  padding-left: 1.6em;
  font-size: 1.025rem;
  line-height: 1.75;
  margin-bottom: var(--sp-3);
  color: var(--color-text);
}
.article-body ul li::before,
.section-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: .65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-sky-400);
  flex-shrink: 0;
}

/* Nested unordered — smaller hollow bullet */
.article-body ul ul li::before,
.section-body ul ul li::before {
  width: 6px;
  height: 6px;
  top: .68em;
  background: transparent;
  border: 2px solid var(--clr-sky-400);
}

/* Ordered lists — styled numbered circles */
.article-body ol,
.section-body ol {
  counter-reset: ol-counter;
}
.article-body ol li,
.section-body ol li {
  counter-increment: ol-counter;
  position: relative;
  padding-left: 2.25em;
  font-size: 1.025rem;
  line-height: 1.75;
  margin-bottom: var(--sp-3);
  color: var(--color-text);
}
.article-body ol li::before,
.section-body ol li::before {
  content: counter(ol-counter);
  position: absolute;
  left: 0;
  top: .12em;
  width: 1.55em;
  height: 1.55em;
  background: linear-gradient(135deg, var(--clr-indigo-700), var(--clr-indigo-600));
  color: white;
  font-size: .8em;
  font-weight: 700;
  border-radius: 50%;
  text-align: center;
  line-height: 1.55em;
  font-family: var(--font-sans);
}

/* Nested ordered */
.article-body ol ol li::before,
.section-body ol ol li::before {
  background: var(--color-surface-alt);
  color: var(--clr-indigo-700);
  border: 2px solid var(--clr-indigo-600);
  line-height: 1.3em;
}

/* Strong/links inside li */
.article-body li strong, .section-body li strong { color: var(--color-text); font-weight: 700; }
.article-body li code, .section-body li code { font-size: .875em; }

/* Links in content */
.article-body a, .section-body a {
  color: var(--clr-indigo-700); font-weight: 500;
  text-decoration-color: var(--color-border);
}
.article-body a:hover, .section-body a:hover { color: var(--clr-sky-500); text-decoration-color: var(--clr-sky-300); }

/* Blockquote */
.article-body blockquote, .section-body blockquote {
  border-left: 4px solid var(--clr-sky-300);
  background: var(--color-surface-alt);
  padding: var(--sp-4) var(--sp-6);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  margin: var(--sp-6) 0;
  color: var(--color-text-2);
  font-style: italic;
}

/* Horizontal rule */
.article-body hr { border: 0; border-top: 2px solid var(--color-border-lt); margin: var(--sp-12) 0; }

/* ============================================================
   TASK LIST / CHECKBOXES
   ============================================================ */
.task-list { list-style: none; padding-left: 0; }
.task-list-item { display: flex; align-items: flex-start; gap: var(--sp-3); padding: var(--sp-2) 0; }
.task-list-item input[type="checkbox"] {
  appearance: none; -webkit-appearance: none;
  width: 18px; height: 18px; min-width: 18px;
  border: 2px solid var(--color-border);
  border-radius: var(--r-sm);
  background: var(--color-surface);
  cursor: pointer;
  margin-top: 3px;
  position: relative;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.task-list-item input[type="checkbox"]:checked {
  background: var(--clr-indigo-700);
  border-color: var(--clr-indigo-700);
}
.task-list-item input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 3px; top: 0px;
  width: 8px; height: 12px;
  border: 2px solid white;
  border-top: none; border-left: none;
  transform: rotate(45deg);
}
.task-list-item input[type="checkbox"]:hover:not(:checked) { border-color: var(--clr-sky-400); }
.task-list-item.is-checked label,
.task-list-item.is-checked > p { text-decoration: line-through; color: var(--color-text-muted); }

/* ============================================================
   CODE BLOCKS — Prism light theme (Ocean Blue Serenity)
   ============================================================ */
.code-block-wrapper {
  position: relative;
  margin: var(--sp-6) 0;
}

pre[class*="language-"],
pre:not([class]) {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border-lt);
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-6);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .875rem;
  line-height: 1.65;
  margin: var(--sp-6) 0;
  box-shadow: var(--sh-sm);
}

/* Code inside pre blocks — reset any inline-code overrides, use Prism colours */
code[class*="language-"],
pre[class*="language-"] code,
pre code {
  font-family: var(--font-mono);
  font-size: inherit;
  background: none;
  padding: 0;
  border-radius: 0;
  color: var(--color-code-text);
}

/* Prism token colors — light theme */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #5b6a8e; font-style: italic; }
.token.punctuation { color: #556090; }
.token.namespace { opacity: 1; }
.token.property, .token.tag, .token.boolean, .token.number, .token.constant, .token.symbol { color: #0e6cbc; }
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin { color: #1a7e35; }
.token.operator, .token.entity, .token.url,
.language-css .token.string, .style .token.string { color: #556090; }
.token.atrule, .token.attr-value, .token.keyword { color: #7c2fbd; font-weight: 500; }
.token.function, .token.class-name { color: #b83232; }
.token.regex, .token.important, .token.variable { color: #9e5500; }
.token.important, .token.bold { font-weight: bold; }
.token.italic { font-style: italic; }
.token.inserted { color: #1a7e35; background: rgba(26,126,53,.08); }
.token.deleted { color: #b83232; background: rgba(184,50,50,.08); }

/* Copy button */
.copy-btn {
  position: absolute; top: var(--sp-3); right: var(--sp-3);
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  color: var(--color-text-muted); font-family: var(--font-sans); font-size: .75rem; font-weight: 600;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
  z-index: 1;
}
.copy-btn:hover { background: var(--clr-sky-50); color: var(--clr-indigo-700); border-color: var(--clr-sky-300); }
.copy-btn.copied { background: #e6f9ee; color: #1a7e35; border-color: #6fcf97; }

/* ============================================================
   TABLES
   ============================================================ */
.article-body table, .section-body table {
  width: 100%; border-collapse: collapse;
  font-size: .9rem; margin: var(--sp-6) 0;
  background: var(--color-surface);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-sm);
}

/* Responsive table wrapper — injected by JS or applied inline */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--r-lg);
  border: 1px solid var(--color-border-lt);
  margin: var(--sp-6) 0;
  box-shadow: var(--sh-sm);
}
.table-wrapper table { margin: 0; border-radius: 0; box-shadow: none; border: none; }

.article-body th, .section-body th {
  background: linear-gradient(90deg, var(--clr-indigo-800), var(--clr-indigo-700));
  color: white; font-weight: 700; font-size: .8rem;
  text-align: left; padding: var(--sp-3) var(--sp-5);
  letter-spacing: .03em;
}
.article-body td, .section-body td {
  padding: var(--sp-3) var(--sp-5);
  border-bottom: 1px solid var(--color-border-lt);
  color: var(--color-text); vertical-align: top;
}
.article-body td code, .section-body td code { font-size: .82em; }
.article-body tr:last-child td, .section-body tr:last-child td { border-bottom: none; }
.article-body tr:nth-child(even) td, .section-body tr:nth-child(even) td { background: var(--color-bg); }

/* ============================================================
   MERMAID DIAGRAMS
   ============================================================ */
.mermaid {
  background: var(--color-surface);
  border: 1px solid var(--color-border-lt);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  margin: var(--sp-8) 0;
  text-align: center;
  overflow-x: auto;
  box-shadow: var(--sh-sm);
}

/* ============================================================
   FAQ ACCORDIONS
   ============================================================ */
.faq-accordion { margin: var(--sp-6) 0; }
.faq-item {
  border: 1px solid var(--color-border-lt);
  border-radius: var(--r-lg);
  margin-bottom: var(--sp-3);
  background: var(--color-surface);
  overflow: hidden;
  transition: box-shadow var(--t-base);
}
.faq-item[open] { box-shadow: var(--sh-md); border-color: var(--color-border); }
.faq-question,
.faq-item > summary {
  padding: var(--sp-4) var(--sp-6);
  cursor: pointer;
  list-style: none;
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 600; font-size: 1rem; color: var(--clr-indigo-800);
  user-select: none;
  transition: background var(--t-fast), color var(--t-fast);
}
.faq-question::-webkit-details-marker,
.faq-item > summary::-webkit-details-marker { display: none; }
.faq-question::after,
.faq-item > summary::after { content: '＋'; font-size: 1.1rem; color: var(--clr-sky-400); transition: transform var(--t-base); flex-shrink: 0; }
.faq-item[open] .faq-question,
.faq-item[open] > summary { background: var(--clr-sky-50); color: var(--clr-indigo-900); border-bottom: 1px solid var(--color-border-lt); }
.faq-item[open] .faq-question::after,
.faq-item[open] > summary::after { content: '－'; }
.faq-question:hover,
.faq-item > summary:hover { background: var(--clr-sky-50); }
.faq-answer { padding: var(--sp-5) var(--sp-6); color: var(--color-text); line-height: 1.7; font-size: .975rem; }
.faq-answer p { margin-bottom: var(--sp-3); }
.faq-answer p:last-child { margin-bottom: 0; }

/* ============================================================
   RELATED NAVIGATION
   ============================================================ */
.related-nav {
  margin-top: var(--sp-12);
  padding-top: var(--sp-8);
  border-top: 2px solid var(--color-border-lt);
}
.related-section { margin-bottom: var(--sp-8); }
.related-heading {
  font-size: .7rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--color-text-muted);
  margin-bottom: var(--sp-4);
}
.related-list { list-style: none; display: grid; gap: var(--sp-3); }
@media (min-width: 640px) { .related-list { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .related-section--children .related-list { grid-template-columns: repeat(3, 1fr); } }

.related-link {
  display: block;
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border-lt);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}
.related-link:hover { border-color: var(--clr-sky-300); box-shadow: var(--sh-md); transform: translateY(-2px); text-decoration: none; color: inherit; }
.related-link-title { display: block; font-weight: 600; font-size: .95rem; color: var(--clr-indigo-800); margin-bottom: var(--sp-1); }
.related-link:hover .related-link-title { color: var(--clr-sky-500); }
.related-link-desc { display: block; font-size: .82rem; color: var(--color-text-muted); line-height: 1.5; }

.related-parent { margin-bottom: var(--sp-5); }
.related-parent-link {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  color: var(--clr-indigo-700); font-size: .875rem; font-weight: 600;
  text-decoration: none; transition: color var(--t-fast);
}
.related-parent-link:hover { color: var(--clr-sky-500); text-decoration: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 639px) {
  .hero { padding: var(--sp-16) 0 var(--sp-12); }
  .hero-cta { flex-direction: column; }
  .cta-btn { width: 100%; justify-content: center; }
  .home-about, .home-pillars, .home-articles { padding: var(--sp-12) 0; }
  .home-pillars-header { margin-bottom: var(--sp-8); }
  .article-body h1 { font-size: 1.75rem; }
  .article-body h2 { font-size: 1.35rem; }
}

/* ============================================================
   UTILITIES
   ============================================================ */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.text-center { text-align: center; }