/* ============================================
   Quicksilver Software Development (QSD)
   Design system: clean, minimal, editorial — red accent variant
   Colors pulled directly from the real "GreyRed" vector logo.
   ============================================ */

:root {
  --bg: #FAFAF8;
  --bg-alt: #F1F0EC;
  --ink: #2D3030;          /* brand charcoal (from logo) */
  --ink-soft: #545B5B;
  --ink-faint: #8B9191;
  --line: #DEDDD6;
  --accent: #C21212;       /* brand red (from logo) */
  --accent-soft: #F7E3E3;
  --accent-ink: #8A0D0D;
  --white: #FFFFFF;
  --max: 1120px;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  color: var(--ink);
}

h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); font-weight: 500; }
h2 { font-size: clamp(1.6rem, 3vw, 2.15rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1.1em; color: var(--ink-soft); }
p.lead { font-size: 1.2rem; color: var(--ink); line-height: 1.55; }

.eyebrow {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.9em;
  display: block;
}

.text-faint { color: var(--ink-faint); }

ul.plain, ol.plain { padding: 0; margin: 0; list-style: none; }

ul.check { padding: 0; margin: 0 0 1.2em; list-style: none; }
ul.check li {
  position: relative;
  padding-left: 1.4em;
  margin-bottom: 0.55em;
  color: var(--ink-soft);
}
ul.check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-primary {
  background: var(--ink);
  color: var(--white) !important;
}
.btn-primary:hover { background: var(--accent); }
.btn-secondary {
  background: transparent;
  color: var(--ink) !important;
  border-color: var(--line);
}
.btn-secondary:hover { border-color: var(--ink); }
.btn-arrow::after { content: "→"; margin-left: 2px; }

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}
.brand .logo-combo { height: 130px; width: auto; }
.brand .mark { width: 26px; height: 26px; }
.footer-grid .brand .logo-combo { height: 24px; }

nav.main-nav ul {
  display: flex;
  gap: 24px;
  align-items: center;
}
nav.main-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
nav.main-nav a:hover, nav.main-nav a.active { color: var(--ink); }
nav.main-nav .btn { margin-left: 4px; }

.nav-toggle { display: none; }

/* ---------- Hero ---------- */

.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}
.hero h1 { margin-bottom: 0.45em; }
.hero .lead { max-width: 46ch; }
.hero-cta { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero-graphic { width: 100%; }

.page-hero {
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--line);
}
.page-hero h1 { max-width: 22ch; }
.page-hero .lead { max-width: 62ch; }

/* ---------- Sections ---------- */

section { padding: 84px 0; }
section.tight { padding: 56px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.divider { border: none; border-top: 1px solid var(--line); margin: 0; }

/* ---------- Grids / Cards ---------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 34px 30px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
a.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .icon { width: 40px; height: 40px; margin-bottom: 20px; color: var(--accent); }
.card h3 { margin-bottom: 0.4em; }
.card p { font-size: 0.95rem; margin-bottom: 0.8em; }
.card .card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.card.featured {
  border-color: var(--accent);
  box-shadow: 0 1px 0 var(--accent);
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 14px;
}

/* ---------- Steps ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.step { border-top: 2px solid var(--ink); padding-top: 18px; }
.step .num {
  font-family: var(--serif);
  font-size: 1.6rem;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}

.method-steps { counter-reset: mstep; }
.method-steps li {
  counter-increment: mstep;
  position: relative;
  padding: 22px 0 22px 56px;
  border-bottom: 1px solid var(--line);
}
.method-steps li:first-child { border-top: 1px solid var(--line); }
.method-steps li::before {
  content: counter(mstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--accent);
}
.method-steps h4 { margin-bottom: 4px; }
.method-steps p { margin: 0; font-size: 0.95rem; }

/* ---------- Two column content ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.split.reverse { direction: rtl; }
.split.reverse > * { direction: ltr; }

/* ---------- Diagnostic detail page ---------- */

.detail-meta {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}
.detail-meta div { max-width: 320px; }
.detail-meta .label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 6px;
}
.detail-meta .value { color: var(--ink); font-weight: 500; }

.decision-box {
  background: var(--ink);
  color: var(--white);
  border-radius: 8px;
  padding: 44px;
  margin: 8px 0;
}
.decision-box .eyebrow { color: #D99A9B; }
.decision-box p { color: #E7E9E7; font-size: 1.15rem; font-family: var(--serif); font-weight: 400; margin: 0; line-height: 1.5; }

/* ---------- Quote / testimonial ---------- */

.quote-block {
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}
.quote-block blockquote {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: 400;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 24px;
}
.quote-block blockquote::before { content: "\201C"; }
.quote-block blockquote::after { content: "\201D"; }
.quote-block cite {
  font-style: normal;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
}

/* ---------- Values grid ---------- */

.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.value-card { border-top: 2px solid var(--accent); padding-top: 16px; }
.value-card h4 { margin-bottom: 6px; }
.value-card p { font-size: 0.9rem; margin: 0; }

/* ---------- Case study cards ---------- */

.case-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 30px;
  margin-bottom: 22px;
}
.case-card .case-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.case-card .case-meta span {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 20px;
}
.case-card h3 { margin-bottom: 10px; }
.case-card .outcome-list { margin: 14px 0 0; }
.case-card .outcome-list li { font-size: 0.92rem; }
.case-card blockquote {
  font-family: var(--serif);
  font-style: normal;
  color: var(--ink-soft);
  font-size: 1rem;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin: 16px 0 0;
}

/* ---------- Pricing ---------- */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.pricing-card {
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 6px;
  padding: 32px;
  text-align: center;
}
.pricing-card .price {
  font-family: var(--serif);
  font-size: 2.4rem;
  color: var(--ink);
  margin: 10px 0;
}
.pricing-card .price span { font-size: 1rem; color: var(--ink-faint); font-family: var(--sans); }

/* ---------- Diagnostics index list ---------- */

.diag-row {
  display: grid;
  grid-template-columns: 60px 1.4fr 2fr auto;
  gap: 28px;
  align-items: center;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}
.diag-row:first-child { border-top: 1px solid var(--line); }
.diag-row .icon { width: 34px; height: 34px; color: var(--accent); }
.diag-row h3 { margin-bottom: 6px; }
.diag-row p { margin: 0; font-size: 0.94rem; }
.diag-row .row-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--ink);
  color: var(--white);
  padding: 76px 0;
  text-align: center;
}
.cta-band h2 { color: var(--white); }
.cta-band p { color: #C7CBCA; max-width: 50ch; margin-left: auto; margin-right: auto; }
.cta-band .btn-primary { background: var(--white); color: var(--ink); }
.cta-band .btn-primary:hover { background: var(--accent-soft); }
.cta-band .btn-secondary { border-color: #4B5555; color: var(--white); }
.cta-band .btn-secondary:hover { border-color: var(--white); }

/* ---------- Footer ---------- */

footer.site-footer {
  border-top: 1px solid var(--line);
  padding: 56px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
.footer-grid h4 {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 16px;
}
.footer-grid ul li { margin-bottom: 10px; }
.footer-grid a { font-size: 0.92rem; color: var(--ink-soft); }
.footer-grid a:hover { color: var(--accent); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--ink-faint);
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Quote / model teaser ---------- */

.model-teaser {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 64px;
  align-items: center;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  nav.main-nav { display: none; }
  .hero-grid, .split, .model-teaser { grid-template-columns: 1fr; gap: 40px; }
  .split.reverse { direction: ltr; }
  .split.reverse > *:first-child { order: 2; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .diag-row { grid-template-columns: 1fr; gap: 10px; }
  .diag-row .icon { display: none; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .container { padding: 0 20px; }
  section { padding: 56px 0; }
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 48px; }
  .decision-box { padding: 30px 24px; }
  .values-grid { grid-template-columns: 1fr; }
}