/* =========================================================================
   Food Safety Traceability & FSMA 204 Compliance Automation
   Light, elegant, professional theme. Mobile-first, wide on desktop.
   ========================================================================= */

:root {
  /* Palette: calm greens/teals (food + safety) with a warm amber accent. */
  --green-700: #0f6f5a;
  --green-600: #1f8a6d;
  --green-500: #2aa17f;
  --green-400: #34c08a;
  --teal-700: #0f6f7a;
  --teal-100: #dff5ec;
  --amber: #f4a93b;
  --amber-dark: #d4860f;
  --rose: #e25563;

  --ink: #16302a;          /* primary text */
  --ink-soft: #45615a;     /* secondary text */
  --ink-faint: #6e857e;
  --line: #d8e7e0;         /* borders */
  --bg: #f6faf8;           /* page background */
  --surface: #ffffff;      /* cards / header */
  --surface-2: #eef6f2;    /* subtle fills */
  --code-bg: #f3f8f5;      /* inline + block code background (light) */
  --code-border: #e2efe9;

  --brand: var(--green-600);
  --brand-strong: var(--green-700);
  --link: #157a63;
  --link-hover: #0c5746;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 2px rgba(16, 60, 48, 0.06), 0 2px 8px rgba(16, 60, 48, 0.05);
  --shadow-md: 0 6px 22px rgba(16, 60, 48, 0.10);
  --shadow-lg: 0 18px 48px rgba(16, 60, 48, 0.16);

  --header-h: 68px;
  --maxw: 1320px;          /* wide content container for desktops */
  --readw: 78ch;           /* comfortable reading measure inside prose */

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(1100px 520px at 100% -10%, rgba(52, 192, 138, 0.10), transparent 60%),
    radial-gradient(900px 480px at -10% 0%, rgba(15, 111, 122, 0.08), transparent 55%),
    var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* Sticky footer scaffold */
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Anchor offset so in-page links clear the sticky header. */
:target { scroll-margin-top: calc(var(--header-h) + 16px); }
[id] { scroll-margin-top: calc(var(--header-h) + 16px); }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 3rem);
}

/* ---------- Links ---------- */
a { color: var(--link); text-decoration: none; transition: color 0.18s var(--ease); }
a:hover { color: var(--link-hover); }
.prose a {
  background-image: linear-gradient(var(--green-400), var(--green-400));
  background-size: 0% 2px;
  background-repeat: no-repeat;
  background-position: 0 1.15em;
  transition: background-size 0.25s var(--ease), color 0.18s var(--ease);
}
.prose a:hover { background-size: 100% 2px; color: var(--link-hover); }

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand:hover { color: var(--ink); }
.brand__mark { width: 38px; height: 38px; flex: none; transition: transform 0.4s var(--ease); }
.brand:hover .brand__mark { transform: rotate(-8deg) scale(1.06); }
.brand__name { font-size: 1.02rem; line-height: 1.1; }
.brand__name small { display: block; font-weight: 600; font-size: 0.72rem; color: var(--ink-faint); letter-spacing: 0.02em; }

.nav { display: flex; align-items: center; gap: 0.35rem; }
.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.nav__link svg { width: 18px; height: 18px; }
.nav__link:hover { background: var(--surface-2); color: var(--brand-strong); }
.nav__link[aria-current="page"] {
  background: linear-gradient(135deg, var(--green-600), var(--teal-700));
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.nav__link[aria-current="page"]:hover { color: #fff; }

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 10px;
  width: 42px; height: 42px;
  align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--ink);
}
.nav-toggle svg { width: 22px; height: 22px; }

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem clamp(1rem, 4vw, 3rem) 1rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-130%);
    transition: transform 0.32s var(--ease);
    visibility: hidden;
  }
  .nav[data-open="true"] { transform: translateY(0); visibility: visible; }
  .nav__link { justify-content: flex-start; }
}

/* =========================================================================
   Main / layout
   ========================================================================= */
main { flex: 1 0 auto; }
.section-block { padding-block: clamp(2.5rem, 5vw, 4.5rem); }

/* =========================================================================
   Hero (home)
   ========================================================================= */
.hero { text-align: center; padding-block: clamp(2.5rem, 6vw, 5rem) clamp(2rem, 4vw, 3.5rem); }
.hero__logo { display: block; margin: 0 auto 1.5rem; width: min(180px, 42vw); height: auto; filter: drop-shadow(0 12px 24px rgba(15, 111, 90, 0.22)); animation: floaty 6s ease-in-out infinite; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.hero__eyebrow {
  display: inline-block;
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--brand-strong);
  background: var(--teal-100);
  padding: 0.35rem 0.9rem; border-radius: 999px; margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 auto 1rem;
  max-width: 18ch;
  background: linear-gradient(120deg, var(--green-700), var(--teal-700) 55%, var(--green-500));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--ink-soft); max-width: 65ch; margin: 0 auto 1.25rem; }
.hero p { max-width: 70ch; margin-inline: auto; color: var(--ink-soft); }

/* CTA buttons with colorful icons */
.cta-row { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; margin-top: 2rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.8rem 1.3rem; border-radius: 12px; font-weight: 700; font-size: 1rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease);
}
.btn:hover { transform: translateY(-3px); }
.btn--primary { background: linear-gradient(135deg, var(--green-600), var(--teal-700)); color: #fff; box-shadow: var(--shadow-md); }
.btn--primary:hover { color: #fff; box-shadow: var(--shadow-lg); }
.btn--ghost { background: var(--surface); color: var(--brand-strong); border-color: var(--line); box-shadow: var(--shadow-sm); }
.btn--ghost:hover { color: var(--brand-strong); border-color: var(--green-400); }
.btn__icon { display: inline-flex; width: 26px; height: 26px; align-items: center; justify-content: center; border-radius: 8px; flex: none; }
.btn__icon svg { width: 18px; height: 18px; }
.btn--primary .btn__icon { background: rgba(255,255,255,0.18); color: #fff; }
.ico-amber { background: rgba(244,169,59,0.16); color: var(--amber-dark); }
.ico-teal  { background: rgba(15,111,122,0.14); color: var(--teal-700); }
.ico-green { background: rgba(42,161,127,0.16); color: var(--green-700); }
.ico-rose  { background: rgba(226,85,99,0.14); color: var(--rose); }

/* =========================================================================
   Cards (section landings, feature grids)
   ========================================================================= */
.grid { display: grid; gap: 1.25rem; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  position: relative;
  display: flex; flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: linear-gradient(90deg, var(--green-400), var(--teal-700));
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s var(--ease);
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--green-400); }
.card:hover::before { transform: scaleX(1); }
.card__icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 0.9rem; background: var(--surface-2); color: var(--brand-strong); }
.card__icon svg { width: 24px; height: 24px; }
.card h3 { margin: 0 0 0.4rem; font-size: 1.18rem; color: var(--ink); letter-spacing: -0.01em; }
.card p { margin: 0 0 1rem; color: var(--ink-soft); font-size: 0.96rem; }
.card a.card__link { margin-top: auto; font-weight: 700; color: var(--link); display: inline-flex; align-items: center; gap: 0.3rem; }
.card a.card__link::after { content: "→"; transition: transform 0.2s var(--ease); }
.card:hover a.card__link::after { transform: translateX(4px); }

.card__sublist { list-style: none; margin: 0.25rem 0 1rem; padding: 0; display: grid; gap: 0.3rem; }
.card__sublist a { font-size: 0.9rem; color: var(--ink-soft); display: inline-flex; gap: 0.4rem; }
.card__sublist a::before { content: "›"; color: var(--green-500); font-weight: 800; }
.card__sublist a:hover { color: var(--brand-strong); }

.section-head { max-width: 70ch; margin-bottom: 1.75rem; }
.section-head h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -0.02em; margin: 0 0 0.5rem; color: var(--ink); }
.section-head p { color: var(--ink-soft); margin: 0; }
.eyebrow { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--green-600); }

/* =========================================================================
   Article / prose pages
   ========================================================================= */
.page-shell { padding-block: clamp(1.5rem, 3vw, 2.5rem) clamp(2.5rem, 5vw, 4rem); }

/* Breadcrumbs */
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; font-size: 0.85rem; color: var(--ink-faint); margin-bottom: 1.5rem; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; margin: 0; padding: 0; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 0.4rem; }
.breadcrumbs li + li::before { content: "/"; color: var(--line); }
.breadcrumbs a { color: var(--ink-soft); font-weight: 600; }
.breadcrumbs a:hover { color: var(--brand-strong); }
.breadcrumbs [aria-current="page"] { color: var(--ink); font-weight: 700; }

.prose { max-width: none; } /* fill the full container width on desktop */
.prose-narrow { max-width: var(--readw); } /* opt-in reading measure when desired */

/* Colorful styled title (first H1) */
.prose h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 1.1rem;
  background: linear-gradient(115deg, var(--green-700), var(--teal-700) 60%, var(--green-500));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.prose h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem); letter-spacing: -0.01em;
  margin: 2.4rem 0 0.9rem; padding-bottom: 0.4rem; color: var(--ink);
  border-bottom: 2px solid var(--surface-2); position: relative;
}
.prose h2::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 3rem; height: 2px; background: linear-gradient(90deg, var(--green-500), var(--teal-700)); }
.prose h3 { font-size: 1.3rem; margin: 1.9rem 0 0.6rem; color: var(--green-700); letter-spacing: -0.01em; }
.prose h4 { font-size: 1.08rem; margin: 1.5rem 0 0.5rem; color: var(--ink); }
.prose p { margin: 0 0 1.15rem; color: var(--ink-soft); }
.prose strong { color: var(--ink); font-weight: 700; }
.prose ul, .prose ol { margin: 0 0 1.2rem; padding-left: 1.4rem; color: var(--ink-soft); }
.prose li { margin-bottom: 0.45rem; }
.prose li::marker { color: var(--green-500); }
.prose blockquote {
  margin: 1.5rem 0; padding: 0.6rem 1.2rem; border-left: 4px solid var(--green-400);
  background: var(--surface-2); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--ink-soft);
}
.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }

/* Heading anchor links (markdown-it-anchor headerLink) */
.prose :is(h2, h3, h4) > a { color: inherit; background: none; }
.prose :is(h2, h3, h4) > a:hover { color: var(--green-600); }

/* ---------- Inline code: light, borderless, blends in ---------- */
.prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  color: #0c5746;
  padding: 0.12em 0.4em;
  border-radius: 6px;
  border: none;
  white-space: nowrap;
}

/* ---------- Code blocks ---------- */
.prose pre[class*="language-"] {
  position: relative;
  margin: 0 0 1.4rem;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
  overflow: auto;
  box-shadow: var(--shadow-sm);
  font-size: 0.875rem;
  line-height: 1.6;
  tab-size: 4;
}
.prose pre[class*="language-"] code { font-family: var(--font-mono); background: none; padding: 0; white-space: pre; }

.code-wrap { position: relative; }
.copy-btn {
  position: absolute; top: 0.6rem; right: 0.6rem; z-index: 2;
  display: inline-flex; align-items: center; gap: 0.35rem;
  font: 600 0.78rem/1 var(--font-sans);
  color: var(--ink-soft);
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--line);
  border-radius: 8px; padding: 0.4rem 0.6rem; cursor: pointer;
  opacity: 0; transform: translateY(-3px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), color 0.2s, border-color 0.2s;
}
.code-wrap:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; transform: translateY(0); }
.copy-btn:hover { color: var(--brand-strong); border-color: var(--green-400); }
.copy-btn svg { width: 14px; height: 14px; }
.copy-btn.is-copied { color: #fff; background: var(--green-600); border-color: var(--green-600); }

/* ---------- Prism light syntax theme (palette-matched) ---------- */
.prose pre[class*="language-"] .token.comment,
.prose pre[class*="language-"] .token.prolog,
.prose pre[class*="language-"] .token.cdata { color: #7d978d; font-style: italic; }
.prose .token.punctuation { color: #5b746c; }
.prose .token.keyword,
.prose .token.boolean,
.prose .token.important { color: #b3358a; font-weight: 600; }
.prose .token.builtin,
.prose .token.class-name { color: #0f6f7a; }
.prose .token.function { color: #1f6fb0; }
.prose .token.string,
.prose .token.char,
.prose .token.attr-value { color: #197a4a; }
.prose .token.number,
.prose .token.constant { color: #c2701a; }
.prose .token.operator,
.prose .token.entity { color: #56707a; background: transparent; }
.prose .token.decorator,
.prose .token.annotation { color: #9a6212; }
.prose .token.property,
.prose .token.tag,
.prose .token.symbol,
.prose .token.deleted { color: #b3358a; }
.prose .token.namespace { opacity: 0.7; }

/* ---------- KaTeX ---------- */
.prose .katex { font-size: 1.04em; }
.prose .katex-display { overflow-x: auto; overflow-y: hidden; padding: 0.75rem 0; margin: 1.25rem 0; }
.prose .katex-display > .katex { color: var(--ink); }

/* ---------- Tables ---------- */
.table-scroll { overflow-x: auto; margin: 0 0 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); -webkit-overflow-scrolling: touch; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 520px; }
.prose thead th { background: linear-gradient(135deg, var(--green-600), var(--teal-700)); color: #fff; text-align: left; font-weight: 700; padding: 0.8rem 1rem; white-space: nowrap; }
.prose tbody td { padding: 0.75rem 1rem; border-top: 1px solid var(--line); color: var(--ink-soft); vertical-align: top; }
.prose tbody tr:nth-child(even) { background: var(--surface-2); }
.prose tbody tr:hover { background: var(--teal-100); }

/* ---------- Interactive checkboxes (task lists) ---------- */
.prose ul.contains-task-list { list-style: none; padding-left: 0.2rem; }
.prose ul.contains-task-list .contains-task-list { padding-left: 1.4rem; }
.prose li.task-list-item { position: relative; padding-left: 2rem; list-style: none; margin-bottom: 0.6rem; }
.prose li.task-list-item::marker { content: ""; }
.task-list-item-checkbox {
  position: absolute; left: 0; top: 0.28em;
  appearance: none; -webkit-appearance: none;
  width: 1.2em; height: 1.2em; margin: 0; cursor: pointer;
  border: 2px solid var(--green-500); border-radius: 6px; background: var(--surface);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.task-list-item-checkbox:hover { border-color: var(--green-700); }
.task-list-item-checkbox:checked { background: var(--green-600); border-color: var(--green-600); }
.task-list-item-checkbox:checked::after {
  content: ""; position: absolute; left: 0.32em; top: 0.12em;
  width: 0.32em; height: 0.6em; border: solid #fff; border-width: 0 2.5px 2.5px 0; transform: rotate(45deg);
}
.task-list-item.is-checked > label, .task-list-item.is-checked { color: var(--ink-faint); text-decoration: line-through; text-decoration-color: var(--green-400); }

/* ---------- FAQ accordions ---------- */
.faq-accordion { border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 0.75rem; background: var(--surface); overflow: hidden; box-shadow: var(--shadow-sm); }
.faq-accordion > summary { cursor: pointer; list-style: none; padding: 1rem 1.2rem; font-weight: 700; color: var(--ink); display: flex; align-items: center; justify-content: space-between; gap: 1rem; transition: background 0.2s var(--ease); }
.faq-accordion > summary::-webkit-details-marker { display: none; }
.faq-accordion > summary:hover { background: var(--surface-2); }
.faq-accordion > summary::after { content: "+"; font-size: 1.4rem; color: var(--green-600); transition: transform 0.25s var(--ease); flex: none; }
.faq-accordion[open] > summary::after { transform: rotate(45deg); }
.faq-accordion__body { padding: 0 1.2rem 1.1rem; color: var(--ink-soft); }

/* ---------- Mermaid diagrams ---------- */
.prose pre.mermaid { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; text-align: center; box-shadow: var(--shadow-sm); overflow-x: auto; margin: 0; }
.prose pre.mermaid:not([data-processed]) { color: transparent; min-height: 80px; }

/* Figure wrapper added by JS once a diagram is rendered — click to expand. */
.prose figure.diagram {
  position: relative;
  margin: 1.6rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  cursor: zoom-in;
  overflow: hidden;
  transition: box-shadow 0.22s var(--ease), border-color 0.22s var(--ease), transform 0.22s var(--ease);
}
.prose figure.diagram:hover { box-shadow: var(--shadow-md); border-color: var(--green-400); }
.prose figure.diagram:focus-visible { outline: 3px solid var(--green-400); outline-offset: 2px; }
.prose figure.diagram > pre.mermaid { border: none; box-shadow: none; border-radius: 0; background: transparent; }
.prose figure.diagram svg { max-width: 100%; height: auto; }
.diagram__expand {
  position: absolute; top: 0.6rem; right: 0.6rem;
  display: inline-flex; align-items: center; gap: 0.35rem;
  font: 600 0.78rem/1 var(--font-sans); color: var(--ink-soft);
  background: rgba(255,255,255,0.92); border: 1px solid var(--line);
  border-radius: 8px; padding: 0.4rem 0.6rem; pointer-events: none;
  opacity: 0; transform: translateY(-3px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.prose figure.diagram:hover .diagram__expand,
.prose figure.diagram:focus-visible .diagram__expand { opacity: 1; transform: translateY(0); }
.diagram__expand svg { width: 14px; height: 14px; }

/* Full-screen modal */
body.modal-open { overflow: hidden; }
.diagram-modal {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; flex-direction: column;
  background: rgba(11, 36, 30, 0.78);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  animation: modalIn 0.18s var(--ease);
}
@keyframes modalIn { from { opacity: 0; } to { opacity: 1; } }
.diagram-modal__bar {
  display: flex; gap: 0.5rem; justify-content: flex-end; align-items: center;
  padding: 0.7rem 0.9rem;
}
.diagram-modal__btn {
  min-width: 42px; height: 42px; padding: 0 0.85rem;
  display: inline-flex; align-items: center; justify-content: center;
  font: 700 1rem/1 var(--font-sans);
  color: #eafaf3; background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.22); border-radius: 10px; cursor: pointer;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.diagram-modal__btn:hover { background: rgba(255,255,255,0.2); border-color: rgba(255,255,255,0.4); }
.diagram-modal__close { font-size: 1.5rem; }
.diagram-modal__stage {
  flex: 1; overflow: hidden; position: relative;
  display: flex; align-items: center; justify-content: center;
  cursor: grab; touch-action: none;
}
.diagram-modal__stage.is-dragging { cursor: grabbing; }
.diagram-modal__canvas {
  width: min(94vw, 1500px); max-height: 86vh;
  display: flex; align-items: center; justify-content: center;
  transform-origin: center center; transition: transform 0.05s linear;
  background: #ffffff;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: var(--radius);
  padding: clamp(1rem, 3vw, 2.5rem);
  box-shadow: 0 24px 60px rgba(0,0,0,0.45);
}
.diagram-modal__canvas svg { width: 100%; height: auto; max-height: 78vh; }
@media (max-width: 640px) { .diagram-modal__btn span { display: none; } }

/* ---------- Related content ---------- */
.related { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.related h2 { font-size: 1.3rem; margin: 0 0 1rem; color: var(--ink); }
.related__grid { display: grid; gap: 0.85rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.related__item { display: block; padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease); }
.related__item:hover { border-color: var(--green-400); transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.related__kind { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--green-600); font-weight: 700; }
.related__title { display: block; margin-top: 0.25rem; font-weight: 600; color: var(--ink); }

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer { flex-shrink: 0; background: #0e2a24; color: #cfe6dd; margin-top: 3rem; }
.site-footer a { color: #cfe6dd; }
.site-footer a:hover { color: #fff; }
.site-footer__inner { display: grid; gap: 2rem; grid-template-columns: 1.4fr repeat(2, 1fr); padding-block: 2.75rem; }
.site-footer__brand { max-width: 34ch; }
.site-footer__brand .brand { color: #fff; }
.site-footer__brand .brand__name small { color: #93b6ab; }
.site-footer__brand p { color: #9fc0b6; font-size: 0.92rem; margin-top: 0.75rem; }
.footer-col h4 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; color: #79a195; margin: 0 0 0.9rem; }
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.55rem; }
.footer-col a { font-size: 0.94rem; color: #b9d6cc; }
.site-footer__bar { border-top: 1px solid rgba(255,255,255,0.08); padding-block: 1.1rem; font-size: 0.85rem; color: #82a59a; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
@media (max-width: 720px) { .site-footer__inner { grid-template-columns: 1fr; } }

/* =========================================================================
   Utilities & motion
   ========================================================================= */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.center { text-align: center; }
.mt-lg { margin-top: 2.5rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* Wider reading measure on large desktops — use more of the screen. */
@media (min-width: 1100px) {
  :root { --readw: 86ch; }
}
@media (min-width: 1500px) {
  :root { --maxw: 1440px; --readw: 92ch; }
}