/* ==========================================================================
   Third Level IT — site.css
   The engineering report, modern execution: bond paper, ink, diazo, stamp.
   One token system. Motion is subtle and fully disabled under reduced motion.
   ========================================================================== */

:root {
  /* Palette */
  --bond:     #F4F3EF; /* page ground, cool archival bond */
  --ink:      #101B2B; /* headings, body-dark, dark bands */
  --diazo:    #28618F; /* links, buttons, structural accents */
  --diazo-deep: #1E4E76; /* hover state */
  --stamp:    #9E3B2C; /* evidence markers and stamps only */
  --graphite: #49525F; /* secondary text, metadata */
  --rule:     #C9D4DE; /* diazo-tinted hairlines and ledger rules on bond */
  --diazo-wash: rgba(40, 97, 143, 0.06); /* light blue panel tint on bond */

  /* Derived, on-dark */
  --rule-dark:  #26364B; /* hairlines on ink */
  --diazo-soft: #8FB8DC; /* links on ink */
  --stamp-soft: #D08D7F; /* evidence markers on ink */
  --surface:    #FFFFFF; /* raised paper: doc card, evidence rows, cards */

  /* Type */
  --font-display: "Big Shoulders", "Arial Narrow", "Helvetica Neue", sans-serif;
  --font-body: "Instrument Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Shape and rhythm */
  --radius-s: 6px;
  --radius-m: 12px;
  --shadow-soft: 0 1px 2px rgba(16, 27, 43, 0.05), 0 8px 28px rgba(16, 27, 43, 0.06);
  --shadow-lift: 0 2px 4px rgba(16, 27, 43, 0.07), 0 14px 40px rgba(16, 27, 43, 0.10);
  --space-section: clamp(4.5rem, 10vw, 8rem);
  --measure: 62ch;
  --container: 1120px;
}

/* Reset-ish */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
body {
  margin: 0;
  background: var(--bond);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
}
img, svg { max-width: 100%; height: auto; display: block; }
[id] { scroll-margin-top: 5.5rem; }

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 0.98;
  letter-spacing: 0.008em;
  margin: 0 0 0.5em;
  font-weight: 700;
}
h1 { font-size: clamp(2.4rem, 3vw + 1.1rem, 3.75rem); }
h2 { font-size: clamp(1.8rem, 2vw + 0.7rem, 2.6rem); }
h3 { font-size: clamp(1.35rem, 1vw + 0.9rem, 1.6rem); }
h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 0.9em;
}

p, ul, ol, dl { margin: 0 0 1.1rem; }
p, li, dd { max-width: var(--measure); }
a {
  color: var(--diazo);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}
a:hover { color: var(--diazo-deep); }
strong { font-weight: 600; }
code, .mono { font-family: var(--font-mono); }

:focus-visible { outline: 2px solid var(--diazo); outline-offset: 2px; border-radius: 2px; }
.band :focus-visible, .site-footer :focus-visible { outline-color: var(--bond); }

.container { max-width: var(--container); margin-inline: auto; padding-inline: 1.5rem; }

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--bond);
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ==========================================================================
   Mono utility voice: eyebrows, tags, metadata
   ========================================================================== */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--diazo);
  margin: 0 0 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.eyebrow::before {
  content: "";
  width: 1.75rem;
  height: 2px;
  background: var(--diazo);
  flex: none;
}
.mono-tags {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--diazo);
  letter-spacing: 0.03em;
  margin: 0 0 1.1rem;
}

/* ==========================================================================
   Evidence markers and index (signature element)
   ========================================================================== */
.ev {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68em;
  font-weight: 500;
  color: var(--stamp);
  background: rgba(158, 59, 44, 0.09);
  border: 1px solid rgba(158, 59, 44, 0.3);
  text-decoration: none;
  position: relative;
  top: -0.35em;
  letter-spacing: 0;
  white-space: nowrap;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.ev::before { content: "["; }
.ev::after { content: "]"; }
.ev:hover, .ev:focus-visible {
  background: var(--stamp);
  border-color: var(--stamp);
  color: #FFFFFF;
  transform: translateY(1px) scale(0.97);
}
.band .ev, .hero .ev, .page-intro .ev {
  color: var(--stamp-soft);
  background: rgba(208, 141, 127, 0.12);
  border-color: rgba(208, 141, 127, 0.4);
}
.band .ev:hover, .band .ev:focus-visible,
.hero .ev:hover, .hero .ev:focus-visible,
.page-intro .ev:hover, .page-intro .ev:focus-visible {
  background: var(--stamp);
  border-color: var(--stamp);
  color: #FFFFFF;
}

.evidence-note {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--graphite);
  max-width: var(--measure);
}
.evidence-list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.evidence-list li {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr) auto;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  max-width: none;
  padding: 1.1rem 1.4rem;
  border-left: 3px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}
.evidence-list li + li { border-top: 1px solid var(--rule); }
.evidence-list li:hover { background: rgba(40, 97, 143, 0.04); }
.evidence-list li:target {
  background: rgba(158, 59, 44, 0.06);
  border-left-color: var(--stamp);
}
.ev-ref { color: var(--stamp); font-weight: 500; }
.ev-claim { color: var(--ink); }
.ev-claim::before { content: "\201C"; }
.ev-claim::after { content: "\201D"; }
.ev-src { max-width: 24rem; text-align: right; }
.ev-back { text-decoration: none; margin-left: 0.5rem; }

@media (prefers-reduced-motion: no-preference) {
  .evidence-list li.is-stamped { animation: stamp-in 0.6s ease-out; }
  @keyframes stamp-in {
    0%   { background-color: rgba(158, 59, 44, 0.22); border-left-color: var(--stamp); }
    100% { background-color: rgba(158, 59, 44, 0.06); border-left-color: var(--stamp); }
  }
}

/* ==========================================================================
   Header and navigation (sticky, condenses on scroll)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(244, 243, 239, 0.86);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header { background: var(--bond); }
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.05rem;
  transition: padding 0.25s ease;
}
.brand { display: inline-flex; align-items: center; }
.brand img { height: 42px; width: auto; transition: height 0.25s ease; }
.site-header.is-scrolled .container { padding-block: 0.55rem; }
.site-header.is-scrolled .brand img { height: 32px; }
.site-header.is-scrolled { box-shadow: 0 8px 24px rgba(16, 27, 43, 0.07); }

.nav-toggle {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--ink);
  border-radius: var(--radius-s);
  color: var(--ink);
  padding: 0.45rem 0.9rem;
  cursor: pointer;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.site-nav a, .site-nav summary {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s ease;
}
.site-nav a:hover, .site-nav summary:hover { color: var(--diazo); }
.site-nav a[aria-current="page"] {
  color: var(--diazo);
  text-decoration: underline;
  text-underline-offset: 6px;
}
.site-nav .nav-cta {
  background: var(--diazo);
  color: #FFFFFF;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--diazo);
  border-radius: var(--radius-s);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.site-nav .nav-cta:hover {
  background: var(--diazo-deep);
  border-color: var(--diazo-deep);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

.nav-dd { position: relative; }
.nav-dd summary { list-style: none; }
.nav-dd summary::-webkit-details-marker { display: none; }
.nav-dd summary::after { content: " \25BE"; font-size: 0.7em; }
.nav-dd details[open] > ul {
  position: absolute;
  top: calc(100% + 0.9rem);
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-lift);
  min-width: 15.5rem;
  padding: 0.5rem;
  display: block;
  z-index: 50;
}
.nav-dd details[open] > ul li { padding: 0; }
.nav-dd details[open] > ul a {
  display: block;
  padding: 0.6rem 0.9rem;
  text-transform: none;
  letter-spacing: 0.03em;
  font-size: 0.85rem;
  border-radius: var(--radius-s);
}
.nav-dd details[open] > ul a:hover { background: var(--bond); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.85rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-soft); }
.btn:active { transform: translateY(0); box-shadow: none; }
.btn-primary { background: var(--diazo); color: #FFFFFF; border-color: var(--diazo); }
.btn-primary:hover { background: var(--diazo-deep); border-color: var(--diazo-deep); color: #FFFFFF; }
.btn-ghost { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--ink); color: var(--bond); }
.btn-on-dark { background: var(--bond); color: var(--ink); border-color: var(--bond); }
.btn-on-dark:hover { background: #FFFFFF; color: var(--ink); }
.btn-on-dark-ghost { border-color: rgba(244, 243, 239, 0.55); color: var(--bond); background: transparent; }
.btn-on-dark-ghost:hover { background: var(--bond); color: var(--ink); border-color: var(--bond); }
.btn-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.25rem; }

/* ==========================================================================
   Hero and document card
   ========================================================================== */
/* Dark brand hero: ink-to-diazo, with the stacked-steps motif as geometry */
.hero, .page-intro {
  position: relative;
  overflow: hidden;
  background-color: var(--ink);
  background-image:
    radial-gradient(70rem 36rem at 88% 118%, rgba(40, 97, 143, 0.5), transparent 62%),
    linear-gradient(155deg, #0C1522 0%, #101B2B 38%, #17324F 74%, #1E4E76 100%);
  color: var(--bond);
}
.hero::after, .page-intro::after {
  content: "";
  position: absolute;
  right: -6rem;
  bottom: 0;
  width: 44rem;
  height: 21rem;
  background: linear-gradient(200deg, rgba(143, 184, 220, 0.11), rgba(143, 184, 220, 0.03));
  clip-path: polygon(0 100%, 0 66.6%, 33.3% 66.6%, 33.3% 33.3%, 66.6% 33.3%, 66.6% 0, 100% 0, 100% 100%);
  pointer-events: none;
}
.hero > .container, .page-intro > .container { position: relative; z-index: 1; }
.hero h1, .page-intro h1 { color: #FFFFFF; }
.hero .eyebrow, .page-intro .eyebrow { color: var(--diazo-soft); }
.hero .eyebrow::before, .page-intro .eyebrow::before { background: var(--diazo-soft); }
.hero .lede, .page-intro .lede { color: rgba(244, 243, 239, 0.88); }
.hero p, .page-intro p { color: rgba(244, 243, 239, 0.88); }
.hero a:not(.btn):not(.ev), .page-intro a:not(.btn):not(.ev) { color: var(--diazo-soft); }
.hero a:not(.btn):not(.ev):hover, .page-intro a:not(.btn):not(.ev):hover { color: #FFFFFF; }
.hero .btn-ghost, .page-intro .btn-ghost { border-color: rgba(244, 243, 239, 0.55); color: var(--bond); }
.hero .btn-ghost:hover, .page-intro .btn-ghost:hover { background: var(--bond); color: var(--ink); border-color: var(--bond); }
.hero :focus-visible, .page-intro :focus-visible { outline-color: var(--bond); }
.page-intro .contact-block dt { color: var(--diazo-soft); }
.page-intro .contact-block dd { color: var(--bond); }

.hero { padding-block: clamp(4rem, 9vw, 7rem) clamp(3.5rem, 8vw, 6rem); }
.lede {
  font-size: clamp(1.15rem, 1vw + 0.9rem, 1.35rem);
  line-height: 1.6;
  color: var(--graphite);
  max-width: 56ch;
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section { padding-block: calc(var(--space-section) / 2); }
main > .section:last-of-type { padding-bottom: var(--space-section); }
.page-intro { padding-block: clamp(4rem, 9vw, 7rem) clamp(3rem, 6vw, 5rem); }

.sec-grid {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  background: var(--diazo-wash);
  border-left: 3px solid var(--diazo);
  border-radius: var(--radius-m);
  padding: clamp(1.75rem, 3vw, 2.75rem);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--diazo);
  letter-spacing: 0.05em;
  padding-top: 0.75rem;
  margin: 0;
}

/* Homepage service rows */
.svc-list { list-style: none; margin: 3rem 0 0; padding: 0; }
.svc-list li {
  max-width: none;
  border-top: 1px solid var(--rule);
  border-left: 3px solid var(--diazo);
  padding: 2.5rem 0 2.5rem 1.75rem;
  display: grid;
  grid-template-columns: 4.25rem minmax(0, 1fr);
  gap: 2rem;
  transition: background-color 0.2s ease;
}
.svc-list li:hover { background: var(--diazo-wash); }
.svc-list li:last-child { border-bottom: 1px solid var(--rule); }
.svc-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--diazo);
  letter-spacing: 0.05em;
  margin: 0;
  padding-top: 0.55rem;
}
.svc-link, .col-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: color 0.15s ease, transform 0.2s ease;
}
.svc-link:hover, .col-link:hover { text-decoration: underline; transform: translateX(3px); }

/* Service detail pages */
.svc-facts { margin-top: 2rem; }
.svc-facts dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 0.35rem;
}
.svc-facts dd { margin: 0 0 1.6rem; }
.svc-facts dd:last-child { margin-bottom: 0; }

/* Industry cards */
.col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}
.col-grid article {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--diazo);
  border-radius: var(--radius-m);
  padding: 2rem;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.col-grid article:hover {
  border-color: var(--diazo);
  background: linear-gradient(180deg, rgba(40, 97, 143, 0.07), rgba(40, 97, 143, 0.02));
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}
.col-grid h3 { margin-bottom: 0.5rem; }

/* Pull quote */
.pull {
  margin: 2.75rem 0;
  padding-left: 1.5rem;
  border-left: 3px solid var(--diazo);
}
.pull p {
  font-size: clamp(1.3rem, 1vw + 1rem, 1.6rem);
  line-height: 1.45;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}
.pull footer {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--graphite);
}

/* Lists of concrete work */
.done-list { list-style: none; padding: 0; margin: 2rem 0 0; }
.done-list li {
  padding: 1.15rem 0 1.15rem 1.9rem;
  border-top: 1px solid var(--rule);
  position: relative;
}
.done-list li:last-child { border-bottom: 1px solid var(--rule); }
.done-list li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  top: 1.15rem;
  font-family: var(--font-mono);
  color: var(--diazo);
}

/* Contact block */
.contact-block { margin: 2.5rem 0; }
.contact-block dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 0.25rem;
}
.contact-block dd { margin: 0 0 1.4rem; font-size: 1.2rem; }

/* Evidence section divider */
.evidence { border-top: 1px solid var(--rule); margin-top: calc(var(--space-section) / 2); padding-top: calc(var(--space-section) / 2); }

/* ==========================================================================
   Dark bands: trust strip and CTA (premium ink, faint blueprint grid)
   ========================================================================== */
.band {
  position: relative;
  overflow: hidden;
  background-color: var(--ink);
  background-image:
    radial-gradient(90rem 40rem at 85% -20%, rgba(40, 97, 143, 0.45), transparent 60%),
    repeating-linear-gradient(0deg, rgba(143, 184, 220, 0.035) 0, rgba(143, 184, 220, 0.035) 1px, transparent 1px, transparent 56px),
    repeating-linear-gradient(90deg, rgba(143, 184, 220, 0.035) 0, rgba(143, 184, 220, 0.035) 1px, transparent 1px, transparent 56px),
    linear-gradient(160deg, #0D1624 0%, #101B2B 45%, #16304C 82%, #1B4066 100%);
  color: var(--bond);
  padding-block: clamp(3.5rem, 7vw, 5.5rem);
}
.band::after {
  content: "";
  position: absolute;
  left: -5rem;
  bottom: 0;
  width: 34rem;
  height: 15rem;
  background: linear-gradient(200deg, rgba(143, 184, 220, 0.08), rgba(143, 184, 220, 0.02));
  clip-path: polygon(0 0, 33.3% 0, 33.3% 33.3%, 66.6% 33.3%, 66.6% 66.6%, 100% 66.6%, 100% 100%, 0 100%);
  pointer-events: none;
}
.band > .container { position: relative; z-index: 1; }
.band h2 { color: #FFFFFF; }
.band .eyebrow { color: var(--diazo-soft); }
.band .eyebrow::before { background: var(--diazo-soft); }
.band a:not(.btn):not(.ev) { color: var(--diazo-soft); }
.band a:not(.btn):not(.ev):hover { color: #FFFFFF; }
.band p { color: rgba(244, 243, 239, 0.92); }
.trust-strip p.trust-copy {
  font-size: clamp(1.2rem, 1.2vw + 0.95rem, 1.5rem);
  line-height: 1.6;
  max-width: 52ch;
  margin-bottom: 0;
  color: #FFFFFF;
}
.cta-band { padding-block: clamp(4.5rem, 9vw, 7rem); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--ink);
  background-image:
    radial-gradient(70rem 30rem at 10% 120%, rgba(40, 97, 143, 0.35), transparent 62%),
    linear-gradient(180deg, #0F1A29 0%, #0D1624 100%);
  color: var(--bond);
  padding-block: clamp(3.5rem, 7vw, 5rem) 2rem;
  border-top: 3px solid var(--diazo);
}
.site-footer a { color: var(--diazo-soft); }
.site-footer a:hover { color: #FFFFFF; }
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) 1fr 1fr;
  gap: 3rem;
}
.footer-brand {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.9rem;
}
.site-footer h4 { color: var(--diazo-soft); }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { padding: 0.25rem 0; }
.site-footer .footer-grid p { color: rgba(244, 243, 239, 0.85); }
.footer-host { font-size: 0.95rem; }
.footer-legal {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule-dark);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.footer-legal p { margin: 0; max-width: none; color: rgba(244, 243, 239, 0.7); }

/* ==========================================================================
   Scroll reveal (JS adds .js to <html>; no-JS and reduced motion see everything)
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.28s ease-out, transform 0.28s ease-out;
  }
  .js [data-reveal].is-visible { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .col-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; width: 100%; }
  .nav-open .site-nav { display: block; }
  .site-header .container { flex-wrap: wrap; }
  .site-nav ul { flex-direction: column; align-items: stretch; gap: 0; padding-block: 0.5rem; }
  .site-nav li { border-top: 1px solid var(--rule); }
  .site-nav a, .site-nav summary { display: block; padding: 0.85rem 0.25rem; }
  .site-nav .nav-cta { margin-block: 0.6rem; text-align: center; }
  .nav-dd details[open] > ul {
    position: static;
    transform: none;
    border: 0;
    box-shadow: none;
    background: transparent;
    min-width: 0;
    padding-left: 1rem;
  }

  .sec-grid, .svc-list li { grid-template-columns: 1fr; gap: 0.5rem; }
  .sec-num, .svc-num { padding-top: 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .evidence-list li { grid-template-columns: 3.25rem minmax(0, 1fr); padding: 1rem 1.1rem; }
  .evidence-list .ev-src { grid-column: 2; max-width: none; text-align: left; }
}