/* =========================================================
   AMEX DIAGNOSTICS — design tokens
   Palette: cool clinical teal + paper, specimen-red accent
   Type: Source Serif 4 (display) / IBM Plex Sans (body) / IBM Plex Mono (utility)
   ========================================================= */

:root {
  --ink:        #0F2A2E;   /* primary text, deep teal-black */
  --ink-soft:   #24403F;   /* secondary headings */
  --paper:      #F6F8F7;   /* page background */
  --paper-raise:#FFFFFF;   /* card background */
  --teal:       #0E7C7B;   /* primary accent */
  --teal-deep:  #0B5D5C;   /* hover / pressed */
  --teal-wash:  #E7F1F0;   /* tinted background fill */
  --signal:     #C0142F;   /* specimen-red, sparing use */
  --slate:      #5C6B6A;   /* muted text */
  --line:       #D9E2E0;   /* hairline borders */
  --line-strong:#B9C8C6;

  --font-display: 'Source Serif 4', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, Segoe UI, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;

  --radius: 3px;
  --shadow: 0 1px 2px rgba(15,42,46,0.06), 0 6px 20px rgba(15,42,46,0.05);
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 4.4vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }
h3 { font-size: 1.3rem; }

p { margin: 0 0 1em; color: var(--ink-soft); }

a { color: var(--teal-deep); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* -------- utility label / eyebrow (specimen-label motif) -------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-deep);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 4px 10px;
  background: var(--paper-raise);
}
.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--teal);
  border-radius: 50%;
  flex: none;
}
.tag--muted { color: var(--slate); border-color: var(--line); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal-deep);
  margin-bottom: 12px;
  display: block;
}

/* -------- buttons -------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--teal); color: #fff; }
.btn-primary:hover { background: var(--teal-deep); }
.btn-outline { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-outline:hover { border-color: var(--teal); color: var(--teal-deep); }
.btn-invert { background: var(--paper-raise); color: var(--ink); }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* =========================================================
   HEADER
   ========================================================= */
.utility-bar {
  background: var(--ink);
  color: #cfe3e1;
  font-family: var(--font-mono);
  font-size: 0.76rem;
}
.utility-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 8px;
  padding-bottom: 8px;
  gap: 16px;
  flex-wrap: wrap;
}
.utility-bar a { color: #cfe3e1; text-decoration: none; }
.utility-bar a:hover { color: #fff; }
.utility-links { display: flex; gap: 20px; flex-wrap: wrap; }

.site-header {
  background: var(--paper-raise);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 40;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}
.logo {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo span {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--teal-deep);
  font-weight: 500;
  margin-top: 2px;
}

.main-nav ul {
  display: flex;
  gap: 30px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover, .main-nav a[aria-current="page"] {
  color: var(--teal-deep);
  border-bottom-color: var(--teal);
}
.header-actions { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  position: relative;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* =========================================================
   HERO
   ========================================================= */
.hero {
  background:
    radial-gradient(1100px 480px at 82% -10%, var(--teal-wash), transparent 60%),
    var(--paper);
  padding: 76px 0 64px;
  border-bottom: 1px solid var(--line);
}
.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero h1 { max-width: 12ch; }
.hero-lede { font-size: 1.12rem; max-width: 46ch; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.hero-locations {
  display: flex;
  gap: 10px;
  margin-top: 30px;
  flex-wrap: wrap;
}

/* -------- signature element: sample-to-answer pathway -------- */
.pathway {
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
  padding: 26px 22px 20px;
}
.pathway-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.pathway-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.pathway-steps::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}
.pathway-steps li {
  position: relative;
  padding: 0 0 26px 40px;
}
.pathway-steps li:last-child { padding-bottom: 0; }
.pathway-steps .dot {
  position: absolute;
  left: 0;
  top: 2px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: var(--teal-wash);
  border: 1px solid var(--teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--teal-deep);
  font-weight: 600;
}
.pathway-steps strong {
  display: block;
  font-family: var(--font-body);
  font-size: 0.98rem;
  color: var(--ink);
}
.pathway-steps small {
  color: var(--slate);
  font-size: 0.83rem;
}

/* =========================================================
   STATS STRIP
   ========================================================= */
.stats {
  background: var(--ink);
  color: var(--paper);
  padding: 40px 0;
}
.stats .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  color: #fff;
}
.stat span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: #9FC3C0;
  text-transform: uppercase;
}

/* =========================================================
   SECTIONS / GRIDS
   ========================================================= */
.section { padding: 76px 0; }
.section-tight { padding: 48px 0; }
.section-alt { background: var(--paper-raise); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 62ch; margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }

.card {
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px 24px;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--teal); transform: translateY(-2px); }
.card .tag { margin-bottom: 16px; }
.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.94rem; margin-bottom: 0; }
.card a.card-link {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--teal-deep);
  text-decoration: none;
}
.card a.card-link:hover { text-decoration: underline; }

/* audience path cards */
.path-card {
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.path-card h3 { color: #fff; }
.path-card p { color: #B9CFCD; font-size: 0.94rem; }
.path-card .btn { margin-top: auto; align-self: flex-start; }

/* locations */
.location-card {
  border: 1px solid var(--line);
  background: var(--paper-raise);
  border-radius: 6px;
  padding: 26px;
}
.location-card .eyebrow { margin-bottom: 6px; }
.location-card dl {
  margin: 16px 0 0;
  font-size: 0.9rem;
  color: var(--slate);
}
.location-card dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--teal-deep);
  margin-top: 12px;
}
.location-card dd { margin: 2px 0 0; }

/* placeholder callouts */
.placeholder {
  border: 1px dashed var(--line-strong);
  background: var(--teal-wash);
  border-radius: 6px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--teal-deep);
  margin-top: 14px;
}

/* CTA banner */
.cta-banner {
  background: var(--teal);
  color: #fff;
  border-radius: 8px;
  padding: 48px 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-banner h2 { color: #fff; margin-bottom: 6px; }
.cta-banner p { color: #DCEEEC; margin-bottom: 0; }

/* accreditation strip */
.accred-strip {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.accred-chip {
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--slate);
  background: var(--paper-raise);
}

/* table (test menu) */
.test-table { width: 100%; border-collapse: collapse; margin-top: 18px; }
.test-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate);
  border-bottom: 1px solid var(--line-strong);
  padding: 10px 12px;
}
.test-table td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
  vertical-align: top;
}
.test-table tr:hover td { background: var(--teal-wash); }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq-item summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.08rem;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--teal);
  font-size: 1.3rem;
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p { margin-top: 12px; }

/* form */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate);
}
.field input, .field select, .field textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper-raise);
  color: var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--teal);
  outline-offset: 1px;
  border-color: var(--teal);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  background: var(--ink);
  color: #B9CFCD;
  padding: 60px 0 26px;
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-brand .logo { color: #fff; }
.footer-brand p { color: #9FC3C0; font-size: 0.88rem; max-width: 32ch; margin-top: 12px; }
.site-footer h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #7FA8A5;
  margin-bottom: 14px;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 10px; }
.site-footer a { color: #D3E5E3; text-decoration: none; font-size: 0.92rem; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 22px;
  font-size: 0.8rem;
  color: #7FA8A5;
  font-family: var(--font-mono);
  flex-wrap: wrap;
  gap: 10px;
}

/* =========================================================
   PAGE HEADER (interior pages)
   ========================================================= */
.page-hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-raise);
}
.page-hero h1 { max-width: 22ch; }
.page-hero .lede { max-width: 56ch; font-size: 1.05rem; }
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--slate); text-decoration: none; }
.breadcrumb a:hover { color: var(--teal-deep); }

/* reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 980px) {
  .hero .container { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats .container { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}

@media (max-width: 700px) {
  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .header-actions .btn-outline { display: none; }
  .grid-4, .grid-3, .grid-2, .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-banner { flex-direction: column; align-items: flex-start; }
  .utility-links { display: none; }
  .footer-bottom { flex-direction: column; }
}

/* mobile nav open state */
.main-nav.is-open {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--paper-raise);
  border-bottom: 1px solid var(--line);
  padding: 10px 28px 20px;
}
.main-nav.is-open ul { flex-direction: column; gap: 4px; }
.main-nav.is-open a { display: block; padding: 12px 0; }