/* =========================================================================
   3D Geospatial & Digital Twin Automation — site styles
   Light, elegant palette inspired by terrain, sky, and earth.
   ========================================================================= */

:root {
  /* Palette */
  --color-bg: #f6f4ef;            /* warm paper background */
  --color-surface: #ffffff;
  --color-surface-2: #fbf9f4;
  --color-border: #e6e0d4;
  --color-border-strong: #c9c0ad;

  --color-ink: #1f2937;           /* deep slate */
  --color-ink-muted: #5b6471;
  --color-ink-soft: #7c8593;

  --color-primary: #1f6b8a;       /* lake blue */
  --color-primary-hover: #14546e;
  --color-primary-soft: #e3f0f4;

  --color-accent: #c46a3d;        /* terracotta */
  --color-accent-hover: #a8542b;

  --color-green: #4f7a4d;         /* terrain green */
  --color-amber: #d9a441;         /* sunlight */
  --color-magenta: #9a4a78;       /* topo magenta */
  --color-sky: #79c0d8;

  /* Typography */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --font-display: "Iowan Old Style", "Source Serif Pro", Georgia, Cambria, "Times New Roman", serif;

  /* Sizing */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(20, 30, 40, 0.05), 0 1px 3px rgba(20, 30, 40, 0.05);
  --shadow: 0 4px 12px rgba(20, 30, 40, 0.07), 0 1px 3px rgba(20, 30, 40, 0.05);
  --shadow-lg: 0 12px 32px rgba(20, 30, 40, 0.10), 0 2px 6px rgba(20, 30, 40, 0.05);

  --header-h: 64px;
  --content-max: 1400px;
  --reading-max: 1100px;
}

* { box-sizing: border-box; }

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

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(--color-ink);
  background: var(--color-bg);
  background-image:
    radial-gradient(1200px 600px at 80% -200px, rgba(121, 192, 216, 0.18), transparent 60%),
    radial-gradient(900px 600px at -100px 200px, rgba(217, 164, 65, 0.10), transparent 60%);
  background-attachment: fixed;
}

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

a {
  color: var(--color-primary);
  text-decoration-color: rgba(31, 107, 138, 0.35);
  text-underline-offset: 3px;
  transition: color 120ms ease, text-decoration-color 120ms ease;
}
a:hover, a:focus-visible {
  color: var(--color-primary-hover);
  text-decoration-color: var(--color-primary-hover);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection { background: rgba(217, 164, 65, 0.30); color: var(--color-ink); }

/* ----- Skip link ----- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius);
  z-index: 1000;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ----- Layout container ----- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 32px);
}
.container--reading { max-width: var(--reading-max); }

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 700;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  padding: 6px 8px;
  border-radius: var(--radius);
  transition: background 120ms ease;
}
.brand:hover, .brand:focus-visible { background: rgba(31, 107, 138, 0.06); color: var(--color-primary-hover); }
.brand__mark { width: 36px; height: 36px; flex: 0 0 36px; filter: drop-shadow(0 1px 1px rgba(0,0,0,0.08)); }
.brand__name { line-height: 1.1; }
.brand__name small {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--font-sans);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-ink);
  padding: 8px 10px;
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  align-items: center;
  gap: 8px;
}
.nav-toggle:hover { background: var(--color-primary-soft); color: var(--color-primary-hover); }
.nav-toggle__icon { width: 18px; height: 14px; position: relative; display: inline-block; }
.nav-toggle__icon::before,
.nav-toggle__icon::after,
.nav-toggle__icon span {
  content: "";
  position: absolute; left: 0; right: 0;
  height: 2px; background: currentColor; border-radius: 1px;
}
.nav-toggle__icon::before { top: 0; }
.nav-toggle__icon span { top: 50%; transform: translateY(-50%); }
.nav-toggle__icon::after { bottom: 0; }

.primary-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.primary-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-ink-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 120ms ease, color 120ms ease;
}
.primary-nav a .nav-icon { width: 18px; height: 18px; flex: 0 0 18px; }
.primary-nav a:hover, .primary-nav a:focus-visible {
  background: var(--color-primary-soft);
  color: var(--color-primary-hover);
}
.primary-nav a[aria-current="page"],
.primary-nav a.is-active {
  background: var(--color-primary);
  color: #fff;
}
.primary-nav a[aria-current="page"] .nav-icon,
.primary-nav a.is-active .nav-icon { color: #fff; }

/* =========================================================================
   Main
   ========================================================================= */
main { flex: 1 0 auto; padding: clamp(24px, 4vw, 48px) 0 64px; }

/* =========================================================================
   Hero (front page)
   ========================================================================= */
.hero {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0 clamp(32px, 5vw, 64px);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 70%;
  background:
    radial-gradient(closest-side at 30% 50%, rgba(121, 192, 216, 0.35), transparent 70%),
    radial-gradient(closest-side at 75% 30%, rgba(217, 164, 65, 0.25), transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
}
.hero__inner { position: relative; z-index: 1; }
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero__eyebrow svg { width: 14px; height: 14px; color: var(--color-amber); }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--color-ink);
  overflow-wrap: break-word;
  word-wrap: break-word;
  hyphens: auto;
}
.hero h1 .accent {
  background: linear-gradient(120deg, var(--color-primary) 10%, var(--color-green) 60%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  max-width: 820px;
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  color: var(--color-ink-muted);
  margin: 0 0 14px;
}
.hero__paragraph {
  max-width: 880px;
  color: var(--color-ink-muted);
  margin: 0 0 14px;
}

.hero__ctas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.cta {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-ink);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}
.cta:hover, .cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
  color: var(--color-ink);
}
.cta__icon {
  width: 44px; height: 44px; flex: 0 0 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  color: #fff;
}
.cta__icon svg { width: 24px; height: 24px; }
.cta--blue   .cta__icon { background: linear-gradient(135deg, #4aa6c3, var(--color-primary)); }
.cta--green  .cta__icon { background: linear-gradient(135deg, #82b46e, var(--color-green)); }
.cta--earth  .cta__icon { background: linear-gradient(135deg, #e8b85c, var(--color-accent)); }

.cta__body { display: flex; flex-direction: column; gap: 2px; }
.cta__title { font-weight: 700; font-size: 1.05rem; line-height: 1.2; }
.cta__desc { font-size: 0.9rem; color: var(--color-ink-muted); }

/* ----- Section overview cards (front page) ----- */
.section-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 28px;
}
.overview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
  position: relative;
  overflow: hidden;
}
.overview-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-green), var(--color-accent));
  opacity: 0.85;
}
.overview-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--color-border-strong); }
.overview-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 0;
  color: var(--color-ink);
}
.overview-card p { margin: 0; color: var(--color-ink-muted); }
.overview-card ul { margin: 4px 0 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.overview-card ul a {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--color-primary);
  font-size: 0.95rem;
}
.overview-card ul a::before {
  content: ""; width: 6px; height: 6px; border-radius: 999px;
  background: var(--color-amber); flex: 0 0 6px;
}
.overview-card ul a:hover { text-decoration: underline; color: var(--color-primary-hover); }

.section-heading {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; margin: 48px 0 8px;
}
.section-heading h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  margin: 0;
  color: var(--color-ink);
}
.section-heading p { margin: 0; color: var(--color-ink-muted); }

/* =========================================================================
   Content pages
   ========================================================================= */
.content-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 1100px) {
  .content-page { grid-template-columns: minmax(0, 1fr) 280px; }
}

.breadcrumbs {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin-bottom: 8px;
}
.breadcrumbs a { color: var(--color-ink-muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--color-primary); text-decoration: underline; }
.breadcrumbs .sep { color: var(--color-ink-soft); }
.breadcrumbs .current { color: var(--color-ink); font-weight: 600; }

.article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 40px) clamp(20px, 4vw, 56px);
  box-shadow: var(--shadow-sm);
  min-width: 0;
}

.article h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.4vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 18px;
  color: var(--color-ink);
  background: linear-gradient(120deg, var(--color-primary) 10%, var(--color-green) 60%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.article h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2vw, 1.75rem);
  margin: 2em 0 0.5em;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
}
.article h3 {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 1.5vw, 1.35rem);
  margin: 1.8em 0 0.4em;
  color: var(--color-primary);
}
.article h4 { font-size: 1.05rem; margin: 1.6em 0 0.4em; color: var(--color-ink); }

.article h2, .article h3, .article h4 { scroll-margin-top: calc(var(--header-h) + 16px); }

.article p { margin: 0 0 1.1em; }
.article strong { color: var(--color-ink); }

.article ul, .article ol { margin: 0 0 1.2em; padding-left: 1.4em; }
.article li { margin: 0.25em 0; }
.article li::marker { color: var(--color-primary); }

.article blockquote {
  margin: 1.4em 0;
  padding: 14px 18px;
  background: var(--color-primary-soft);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
}

.article hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-strong), transparent);
  margin: 2.4em 0;
}

.article a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.article a:hover {
  color: var(--color-primary-hover);
  background: rgba(31, 107, 138, 0.07);
  border-radius: 3px;
}

.heading-link {
  color: inherit;
  text-decoration: none;
  background: none !important;
}
.heading-link:hover { color: inherit; background: none !important; }

/* ----- Inline code ----- */
.article :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  padding: 0.15em 0.4em;
  background: rgba(31, 107, 138, 0.07);
  color: var(--color-ink);
  border-radius: 4px;
  border: 0;
}

/* ----- Codeblocks ----- */
.codeblock {
  background: #fbf9f4;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin: 1.4em 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.codeblock__bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 10px 6px 14px;
  background: #f1ece0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.75rem;
  color: var(--color-ink-muted);
}
.codeblock__lang {
  text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600;
  color: var(--color-ink-muted);
}
.codeblock__copy {
  font: inherit;
  font-size: 0.75rem;
  padding: 4px 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  color: var(--color-ink);
  border-radius: 999px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.codeblock__copy:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.codeblock__copy.is-copied { background: var(--color-green); color: #fff; border-color: var(--color-green); }
.codeblock__pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.55;
  background: transparent;
}
.codeblock__pre code {
  font-family: var(--font-mono);
  color: var(--color-ink);
  background: none;
  padding: 0;
}

/* ----- Prism token colors tuned to palette ----- */
.token.comment, .token.prolog, .token.cdata { color: #7a8a72; font-style: italic; }
.token.punctuation { color: #5b6471; }
.token.keyword, .token.boolean, .token.atrule { color: #9a4a78; font-weight: 600; }
.token.string, .token.attr-value, .token.char { color: #4f7a4d; }
.token.number, .token.constant { color: #c46a3d; }
.token.function, .token.class-name { color: #1f6b8a; }
.token.operator, .token.entity, .token.url { color: #7c8593; }
.token.builtin, .token.tag, .token.selector { color: #1f6b8a; }
.token.property, .token.attr-name { color: #c46a3d; }
.token.variable { color: #1f2937; }
.token.deleted { color: #b14242; }
.token.inserted { color: #4f7a4d; }
.token.regex, .token.important { color: #d9a441; }

/* ----- Tables ----- */
.table-wrap {
  overflow-x: auto;
  margin: 1.4em 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}
.article table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
  min-width: 480px;
}
.article thead th {
  text-align: left;
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-weight: 700;
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border-strong);
}
.article tbody td {
  padding: 12px 14px;
  border-top: 1px solid var(--color-border);
  vertical-align: top;
}
.article tbody tr:nth-child(even) td { background: var(--color-surface-2); }

/* ----- Task list checkboxes ----- */
.article ul.contains-task-list {
  list-style: none;
  padding-left: 0;
}
.article .task-list-item {
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 2px 0;
}
.article .task-list-item::marker { content: ""; }
.article .task-list-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px; height: 18px;
  flex: 0 0 18px;
  margin: 5px 0 0;
  border: 1.5px solid var(--color-border-strong);
  border-radius: 4px;
  background: var(--color-surface);
  cursor: pointer;
  position: relative;
  transition: background 120ms ease, border-color 120ms ease;
}
.article .task-list-item input[type="checkbox"]:hover { border-color: var(--color-primary); }
.article .task-list-item input[type="checkbox"]:checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.article .task-list-item input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 4px; top: 1px;
  width: 6px; height: 11px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
/* Strike-through the item text when checked. Modern browsers: :has(). */
.article .task-list-item:has(input[type="checkbox"]:checked),
.article .task-list-item.is-checked {
  color: var(--color-ink-muted);
  text-decoration: line-through;
  text-decoration-color: var(--color-ink-soft);
}
.article .task-list-item:has(input[type="checkbox"]:checked) input[type="checkbox"],
.article .task-list-item.is-checked input[type="checkbox"] {
  text-decoration: none;
}

/* ----- Mermaid ----- */
pre.mermaid {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 1.4em 0;
  text-align: center;
  overflow-x: auto;
}

/* ----- FAQ accordions ----- */
.article details.faq,
.article .faq-section details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0;
  margin: 10px 0;
  background: var(--color-surface);
  overflow: hidden;
}
.article details.faq > summary,
.article .faq-section details > summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 18px;
  font-weight: 600;
  color: var(--color-ink);
  display: flex; align-items: center; gap: 10px;
  position: relative;
}
.article details > summary::-webkit-details-marker { display: none; }
.article details.faq > summary::before,
.article .faq-section details > summary::before {
  content: "";
  width: 10px; height: 10px;
  border-right: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(-45deg);
  transition: transform 150ms ease;
  margin-right: 4px;
}
.article details[open].faq > summary::before,
.article .faq-section details[open] > summary::before { transform: rotate(45deg); }
.article details.faq > *:not(summary),
.article .faq-section details > *:not(summary) {
  padding: 0 18px 14px;
}

/* =========================================================================
   Sibling / TOC sidebar
   ========================================================================= */
.toc {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  align-self: start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  font-size: 0.95rem;
  max-height: calc(100vh - var(--header-h) - 32px);
  overflow-y: auto;
}
.toc h4 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}
.toc ul { list-style: none; margin: 0 0 14px; padding: 0; display: grid; gap: 6px; }
.toc a {
  display: block;
  padding: 6px 8px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-ink-muted);
}
.toc a:hover { background: var(--color-primary-soft); color: var(--color-primary-hover); }
.toc a.is-current {
  background: var(--color-primary);
  color: #fff;
}

/* Children + siblings nav at bottom of article */
.related-nav {
  margin-top: 32px;
  display: grid;
  gap: 20px;
}
.related-nav h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 10px;
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.related-card {
  display: flex; flex-direction: column; gap: 4px;
  padding: 14px 16px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-ink);
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}
.related-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
  color: var(--color-ink);
}
.related-card__label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-ink-muted); }
.related-card__title { font-weight: 700; color: var(--color-ink); }

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer {
  flex: 0 0 auto;
  background: #1a2a33;
  color: #d7dde2;
  margin-top: 64px;
}
.site-footer a { color: #d7dde2; text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  padding: 48px 0 24px;
}
.site-footer__brand .brand { color: #fff; }
.site-footer__brand .brand:hover { background: rgba(255,255,255,0.06); color: #fff; }
.site-footer__brand .brand__name small { color: #a8b2bb; }
.site-footer__brand p { margin: 12px 0 0; color: #a8b2bb; max-width: 40ch; }

.site-footer__col h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  margin: 0 0 10px;
  color: #fff;
  letter-spacing: 0.04em;
}
.site-footer__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.site-footer__col li a { font-size: 0.95rem; }

.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 16px 0 28px;
  font-size: 0.85rem;
  color: #a8b2bb;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    gap: 4px;
    box-shadow: var(--shadow);
    display: none;
  }
  .primary-nav.is-open { display: flex; }
  .primary-nav a { padding: 12px 14px; font-size: 1rem; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .article { padding: 18px; }
  .brand__name { font-size: 1rem; }
  .brand__name small { font-size: 0.6rem; }
  .hero { padding-top: 32px; }
}

@media (min-width: 1600px) {
  :root { --content-max: 1500px; }
}