/* ============================================================
   ENGINEERED ANALYTICS — STYLESHEET
   Fonts: DM Serif Display (headings) · Open Sans (body)
   Palette: White background · Red accent #C0392B · Amber highlights
   ============================================================ */

/* ── RESET & BASE ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --colour-bg:        #ffffff;
  --colour-bg-alt:    #f5f5f5;
  --colour-bg-card:   #ffffff;
  --colour-surface:   #efefef;
  --colour-accent:    #C0392B;
  --colour-accent-lt: #e8473a;
  --colour-gold:      #b07800;
  --colour-gold-lt:   #c98d00;
  --colour-text:      #1a1a1a;
  --colour-text-muted:#666666;
  --colour-border:    #e0e0e0;
  --colour-white:     #ffffff;

  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body:    'Open Sans', system-ui, sans-serif;

  --container-max: 1140px;
  --gap:           2rem;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--colour-bg);
  color: var(--colour-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--colour-accent-lt);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

/* ── LAYOUT UTILITY ───────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--colour-text);
  margin-bottom: 2.5rem;
  position: relative;
}

.section-heading::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  background: var(--colour-accent);
  margin-top: 0.6rem;
}

/* ── BUTTON ───────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.85rem 2.25rem;
  border-radius: 4px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
  letter-spacing: 0.02em;
}

.btn--primary {
  background: var(--colour-accent);
  color: var(--colour-white);
  border: 2px solid var(--colour-accent);
}

.btn--primary:hover {
  background: var(--colour-accent-lt);
  border-color: var(--colour-accent-lt);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ── HEADER / NAV ─────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--colour-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav__logo {
  display: flex;
  align-items: center;
}

.nav__logo-img {
  height: 42px;
  width: auto;
}

.nav__logo-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--colour-text);
  margin-left: 0.75rem;
  white-space: nowrap;
}

.nav__right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav__lang-switch {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--colour-text-muted);
  border: 1px solid var(--colour-border);
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  transition: color 0.2s, border-color 0.2s;
}

.nav__lang-switch:hover {
  color: var(--colour-accent);
  border-color: var(--colour-accent);
  text-decoration: none;
}

.nav__links a {
  color: var(--colour-text);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.nav__links a:hover {
  color: var(--colour-accent);
  text-decoration: none;
}

/* ── HERO ─────────────────────────────────────────────────── */
.hero {
  background: var(--colour-bg);
  padding: 7rem 0 6rem;
  border-bottom: 1px solid var(--colour-border);
  position: relative;
  overflow: hidden;
}

/* Subtle warm glow behind hero text */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 60%, rgba(192, 57, 43, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: 800px;
  position: relative;
}

.hero__headline {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1.15;
  color: var(--colour-text);
  margin-bottom: 1.5rem;
}

.hero__headline--sub {
  display: block;
  color: var(--colour-gold);
}

.hero__subline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--colour-text-muted);
  font-weight: 300;
  margin-bottom: 2.5rem;
  max-width: 560px;
}

/* ── CREDIBILITY BAR ──────────────────────────────────────── */
.credibility {
  background: var(--colour-bg-alt);
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--colour-border);
}

.credibility__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.credibility__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 0 1rem;
  border-left: 3px solid var(--colour-accent);
}

.credibility__figure {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--colour-gold);
  line-height: 1.1;
}

.credibility__label {
  font-size: 0.85rem;
  color: var(--colour-text-muted);
  margin-top: 0.35rem;
  line-height: 1.4;
}

/* ── VALUE PROPOSITION ────────────────────────────────────── */
.value-prop {
  background: var(--colour-bg);
  padding: 5rem 0;
  border-bottom: 1px solid var(--colour-border);
}

.value-prop__inner {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 3.5rem;
  max-width: 900px;
}

.value-prop__photo {
  width: 220px;
  height: 270px;
  object-fit: cover;
  object-position: top center;
  border-radius: 6px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.10);
  flex-shrink: 0;
}

.value-prop__text {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 300;
  line-height: 1.8;
  color: var(--colour-text);
  font-style: italic;
  position: relative;
  padding-left: 1.75rem;
  border-left: 3px solid var(--colour-accent);
}

/* ── SERVICES ─────────────────────────────────────────────── */
.services {
  background: var(--colour-bg-alt);
  padding: 5rem 0;
  border-bottom: 1px solid var(--colour-border);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--colour-bg-card);
  border: 1px solid var(--colour-border);
  border-radius: 6px;
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.service-card:hover {
  border-color: var(--colour-accent);
  transform: translateY(-3px);
}

.service-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--colour-text);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.service-card__desc {
  font-size: 0.9rem;
  color: var(--colour-text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.service-card__link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--colour-accent);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.service-card__link:hover {
  color: var(--colour-accent-lt);
}

/* ── CASE STUDY TEASER ────────────────────────────────────── */
.case-study-teaser {
  background: var(--colour-surface);
  padding: 5rem 0;
  border-bottom: 1px solid var(--colour-border);
}

.case-study-teaser__inner {
  max-width: 760px;
}

.case-study-teaser__kicker {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--colour-accent-lt);
  margin-bottom: 1rem;
}

.case-study-teaser__heading {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--colour-text);
  margin-bottom: 1.25rem;
  line-height: 1.2;
}

.case-study-teaser__body {
  font-size: 1.05rem;
  color: var(--colour-text-muted);
  line-height: 1.75;
}

/* ── CREDENTIALS ──────────────────────────────────────────── */
.credentials {
  background: var(--colour-bg);
  padding: 5rem 0;
  border-bottom: 1px solid var(--colour-border);
}

.credentials__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.credential-card {
  background: var(--colour-bg-card);
  border: 1px solid var(--colour-border);
  border-radius: 6px;
  padding: 1.5rem;
  text-align: center;
}

.credential-card__badge {
  display: inline-block;
  background: var(--colour-accent);
  color: var(--colour-white);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: 3px;
  margin-bottom: 1rem;
}

.credential-card__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--colour-text);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.credential-card__detail {
  font-size: 0.8rem;
  color: var(--colour-text-muted);
  line-height: 1.5;
}

.credentials__footer {
  font-size: 0.85rem;
  color: var(--colour-text-muted);
  text-align: center;
  font-style: italic;
}

/* ── CLOSING CTA ──────────────────────────────────────────── */
.cta-section {
  background: var(--colour-bg-alt);
  padding: 6rem 0;
  border-bottom: 1px solid var(--colour-border);
}

.cta-section__inner {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
}

.cta-section__heading {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--colour-text);
  margin-bottom: 1rem;
  line-height: 1.25;
}

.cta-section__body {
  color: var(--colour-text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* ── FOOTER ───────────────────────────────────────────────── */
.site-footer {
  background: #f0f0f0;
  border-top: 1px solid var(--colour-border);
  padding: 2.5rem 0;
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--colour-text-muted);
}

.site-footer__location a {
  color: var(--colour-text-muted);
}

.site-footer__location a:hover {
  color: var(--colour-accent);
}

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .credibility__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .credentials__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .nav__links {
    display: none; /* mobile nav out of scope for Phase 1 */
  }

  .hero {
    padding: 4rem 0 3.5rem;
  }

  .value-prop__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .value-prop__photo {
    width: 100%;
    height: 260px;
  }

  .credibility__grid {
    grid-template-columns: 1fr;
  }

  .services__grid {
    grid-template-columns: 1fr;
  }

  .credentials__grid {
    grid-template-columns: 1fr;
  }

  .credibility__item {
    border-left: 3px solid var(--colour-accent);
    padding-left: 1rem;
  }
}