/* ═══════════════════════════════════════════════════════════════════════════
   DESIGN TOKENS — Sunny Beach Day colour scheme
   ═══════════════════════════════════════════════════════════════════════════ */
:root {
  --color-sand:       #F5DBA3;
  --color-turquoise:  #1AAFA8;
  --color-deep-blue:  #1A3A5C;
  --color-coral:      #E8644A;
  --color-amber:      #F4A821;
  --color-bg:         #FFFEF7;
  --color-surface:    #FEF8EC;
  --color-surface-2:  #F5F0E8;
  --color-border:     #E8D5A3;
  --color-text:       #2C3E50;
  --color-text-muted: #5D6D7E;

  --header-height: 64px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(26,58,92,0.08), 0 1px 2px rgba(26,58,92,0.06);
  --shadow-md: 0 4px 12px rgba(26,58,92,0.10), 0 2px 6px rgba(26,58,92,0.08);
  --shadow-lg: 0 10px 30px rgba(26,58,92,0.12), 0 4px 12px rgba(26,58,92,0.08);

  --transition: 0.2s ease;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 1rem;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
img, svg { display: block; max-width: 100%; }
a { color: var(--color-turquoise); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-deep-blue); }

/* ── Skip link ──────────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-deep-blue);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 10000;
  font-size: 0.9rem;
}
.skip-link:focus { top: 1rem; }

/* ═══════════════════════════════════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  height: var(--header-height);
  background: rgba(255,254,247,0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.site-header__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}
.site-header__site-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-deep-blue);
  letter-spacing: -0.02em;
}
.site-header__dot { color: var(--color-coral); }

.main-nav { margin-left: auto; }
.main-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.main-nav__link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.main-nav__link:hover,
.main-nav__link--active {
  background: var(--color-surface-2);
  color: var(--color-deep-blue);
}
.main-nav__link--active { color: var(--color-turquoise); font-weight: 600; }
.main-nav__icon { font-size: 1rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: auto;
}
.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-deep-blue);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ═══════════════════════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════════════════════ */
.site-footer {
  background: var(--color-deep-blue);
  color: #cde;
  padding: 2.5rem 1.5rem;
  margin-top: auto;
}
.site-footer__inner {
  max-width: 1600px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 2rem;
  align-items: start;
}
.site-footer__logo-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
}
.site-footer__logo-link:hover { color: var(--color-sand); }
.site-footer__tagline { font-size: 0.85rem; color: #8aadc4; margin-top: 0.5rem; }
.site-footer__nav-heading { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-sand); margin-bottom: 0.75rem; }
.site-footer__nav-list { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.site-footer__nav-link { color: #8aadc4; font-size: 0.9rem; transition: color var(--transition); }
.site-footer__nav-link:hover { color: var(--color-turquoise); }
.site-footer__copy { font-size: 0.8rem; color: #8aadc4; align-self: end; }
.site-footer__ext-link { color: var(--color-turquoise); }

/* ═══════════════════════════════════════════════════════════════════════════
   BREADCRUMBS
   ═══════════════════════════════════════════════════════════════════════════ */
.breadcrumbs {
  margin-bottom: 1.5rem;
  padding: 0.5rem 0;
}
.breadcrumbs__list { list-style: none; display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem; }
.breadcrumbs__item { display: flex; align-items: center; gap: 0.25rem; font-size: 0.85rem; }
.breadcrumbs__link { color: var(--color-turquoise); }
.breadcrumbs__link:hover { color: var(--color-deep-blue); }
.breadcrumbs__sep { color: var(--color-text-muted); }
.breadcrumbs__current { color: var(--color-text-muted); }

/* ═══════════════════════════════════════════════════════════════════════════
   HOMEPAGE
   ═══════════════════════════════════════════════════════════════════════════ */
.home-page { overflow: hidden; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-deep-blue) 0%, #0F2A45 50%, #1C4A6E 100%);
  color: #fff;
  padding: 5rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(26,175,168,0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 20% 80%, rgba(244,168,33,0.15) 0%, transparent 50%);
  pointer-events: none;
}
.hero__inner {
  max-width: 1600px;
  margin: 0 auto;
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}
.hero__content { max-width: 700px; }
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(26,175,168,0.2);
  border: 1px solid rgba(26,175,168,0.4);
  color: var(--color-turquoise);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  margin-bottom: 1.25rem;
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 1rem;
}
.hero__title-accent { color: var(--color-turquoise); }
.hero__subtitle {
  font-size: 1.1rem;
  color: #8aadc4;
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 560px;
}
.hero__cta-group { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.hero__cta:hover { transform: translateY(-2px); }
.hero__cta--primary {
  background: var(--color-turquoise);
  color: #fff;
  box-shadow: 0 4px 16px rgba(26,175,168,0.35);
}
.hero__cta--primary:hover {
  background: #17A09A;
  box-shadow: 0 8px 24px rgba(26,175,168,0.45);
  color: #fff;
}
.hero__cta--secondary {
  background: rgba(244,168,33,0.15);
  border: 1.5px solid var(--color-amber);
  color: var(--color-amber);
}
.hero__cta--secondary:hover {
  background: rgba(244,168,33,0.25);
  color: var(--color-amber);
}
.hero__visual {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  opacity: 0.85;
}
.hero__stream-demo {
  background: rgba(15,42,69,0.8);
  border: 1px solid rgba(26,175,168,0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #8aadc4;
  width: 280px;
}
.hero__stream-demo .line { margin: 0.15rem 0; }
.hero__stream-demo .key { color: var(--color-turquoise); }
.hero__stream-demo .val { color: var(--color-sand); }
.hero__stream-demo .comment { color: #4a6a8a; }

/* About section */
.home-about {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 4rem 1.5rem;
}
.home-about__inner { max-width: 1600px; margin: 0 auto; }
.home-about__title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-deep-blue);
  margin-bottom: 1.25rem;
}
.home-about__body { max-width: 860px; }
.home-about__body p { color: var(--color-text); line-height: 1.8; margin-bottom: 1rem; font-size: 1.05rem; }

/* Section cards */
.home-sections {
  padding: 4rem 1.5rem;
}
.home-sections__inner { max-width: 1600px; margin: 0 auto; }
.home-sections__heading {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-deep-blue);
  margin-bottom: 0.5rem;
}
.home-sections__sub { color: var(--color-text-muted); margin-bottom: 2rem; }

/* ═══════════════════════════════════════════════════════════════════════════
   CARD GRID
   ═══════════════════════════════════════════════════════════════════════════ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-turquoise);
  color: var(--color-text);
}
.card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-deep-blue);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.card__title::before {
  content: '→';
  color: var(--color-turquoise);
  font-weight: 700;
  flex-shrink: 0;
}
.card--section {
  padding: 1.75rem;
  background: linear-gradient(135deg, var(--color-surface) 0%, #f0f8f8 100%);
}
.card--section .card__icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: block;
}
.card--section .card__title { font-size: 1.15rem; margin-bottom: 0.25rem; }
.card--section .card__title::before { display: none; }
.card__desc { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

/* ═══════════════════════════════════════════════════════════════════════════
   SECTION PAGE
   ═══════════════════════════════════════════════════════════════════════════ */
.section-page, .article-page {
  max-width: 1600px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}
.article-page__inner { width: 100%; }

.child-pages { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--color-border); }
.child-pages__heading {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-deep-blue);
  margin-bottom: 1rem;
}

/* ═══════════════════════════════════════════════════════════════════════════
   PROSE (article content)
   ═══════════════════════════════════════════════════════════════════════════ */
.prose {
  --prose-h1: clamp(1.8rem, 4vw, 2.5rem);
  --prose-h2: clamp(1.3rem, 3vw, 1.75rem);
  --prose-h3: 1.2rem;
  --prose-h4: 1.05rem;
}
.prose h1 {
  font-size: var(--prose-h1);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-deep-blue), var(--color-turquoise));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
}
.prose h2 {
  font-size: var(--prose-h2);
  font-weight: 700;
  color: var(--color-deep-blue);
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-sand);
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}
.prose h3 {
  font-size: var(--prose-h3);
  font-weight: 600;
  color: var(--color-deep-blue);
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}
.prose h4 {
  font-size: var(--prose-h4);
  font-weight: 600;
  color: var(--color-text);
  margin-top: 1.25rem;
  margin-bottom: 0.4rem;
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}
.prose h1, .prose h2, .prose h3, .prose h4 {
  position: relative;
}
.anchor-icon {
  font-size: 0.7em;
  color: var(--color-turquoise);
  margin-left: 0.4em;
  opacity: 0;
  text-decoration: none;
  transition: opacity var(--transition);
}
.prose h2:hover .anchor-icon,
.prose h3:hover .anchor-icon,
.prose h4:hover .anchor-icon { opacity: 1; }

.prose p { margin-bottom: 1rem; line-height: 1.8; }
.prose strong { color: var(--color-deep-blue); font-weight: 700; }
.prose em { font-style: italic; }

.prose a {
  color: var(--color-turquoise);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
.prose a:hover { color: var(--color-deep-blue); }

.prose ul, .prose ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.prose li { margin-bottom: 0.3rem; line-height: 1.7; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul > li { padding-left: 1.5rem; position: relative; }
.prose ul > li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-turquoise);
  font-size: 0.8rem;
  top: 0.25em;
}

/* Task lists (checkboxes) — override bullet */
.prose .task-list-item { padding-left: 0; list-style: none; }
.prose .task-list-item::before { display: none; }
.prose .task-list-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--color-turquoise);
  border-radius: 3px;
  margin-right: 0.5rem;
  cursor: pointer;
  vertical-align: middle;
  position: relative;
  top: -1px;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}
.prose .task-list-item input[type="checkbox"]:checked {
  background: var(--color-turquoise);
  border-color: var(--color-turquoise);
}
.prose .task-list-item input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.prose .task-list-item.checked > label,
.prose .task-list-item input[type="checkbox"]:checked ~ label,
.prose .task-list-item input[type="checkbox"]:checked ~ * {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

/* Inline code — subtle, blends with surrounding text */
.prose :not(pre) > code {
  background: rgba(26, 58, 92, 0.06);
  color: inherit;
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.87em;
  border: none;
}

/* Code blocks with copy button */
.prose .code-wrapper { position: relative; }
.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--color-deep-blue);
  color: var(--color-sand);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.65rem;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), background var(--transition);
  letter-spacing: 0.03em;
}
.code-wrapper:hover .copy-btn,
.copy-btn:focus { opacity: 1; }
.copy-btn.copied {
  background: var(--color-turquoise);
  color: #fff;
  opacity: 1;
}

/* Blockquote */
.prose blockquote {
  border-left: 4px solid var(--color-turquoise);
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: var(--color-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Tables */
.table-wrapper { overflow-x: auto; margin: 1.5rem 0; -webkit-overflow-scrolling: touch; }
.prose table {
  min-width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.prose thead { background: var(--color-deep-blue); color: #fff; }
.prose th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}
.prose td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--color-border);
}
.prose tbody tr:nth-child(even) { background: var(--color-surface); }
.prose tbody tr:hover { background: rgba(26,175,168,0.06); }

/* Horizontal rule */
.prose hr {
  border: none;
  border-top: 2px solid var(--color-sand);
  margin: 2.5rem 0;
}

/* Mermaid */
.mermaid-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
}
.mermaid { max-width: 100%; }

/* FAQ / Accordion — auto-detected details/summary */
.prose details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin: 0.75rem 0;
  overflow: hidden;
  background: var(--color-surface);
}
.prose details[open] { box-shadow: var(--shadow-sm); }
.prose summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-deep-blue);
  list-style: none;
  transition: background var(--transition);
  gap: 1rem;
}
.prose summary:hover { background: var(--color-surface-2); }
.prose summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color-turquoise);
  flex-shrink: 0;
  transition: transform var(--transition);
  font-weight: 300;
}
.prose details[open] summary::after { transform: rotate(45deg); }
.prose details > *:not(summary) {
  padding: 0 1.25rem 1rem;
  animation: accordion-open 0.2s ease forwards;
}
@keyframes accordion-open { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { display: none; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 1rem;
    z-index: 850;
  }
  .main-nav.is-open { display: block; }
  .main-nav__list { flex-direction: column; align-items: stretch; }
  .main-nav__link { padding: 0.7rem 0.75rem; }

  .site-footer__inner { grid-template-columns: 1fr; }
  .hero { padding: 3rem 1.25rem 2.5rem; }
  .hero__cta-group { flex-direction: column; }
  .hero__cta { justify-content: center; }
}

@media (min-width: 1400px) {
  /* article-page__inner uses full width at all breakpoints */
}