/* ============================================================
   RD Science des données — Design System (Dark Navy)
   ============================================================ */

:root {
  /* Backgrounds */
  --bg-950: #0a1322;
  --bg-900: #0e1b2e;
  --bg-800: #142539;
  --surface: #182b42;
  --surface-light: #1f3650;
  --border: #28415e;
  --border-soft: #1d324a;

  /* Text */
  --ink: #eef2f8;
  --ink-soft: #c3d0e2;
  --ink-dim: #8ba0bc;
  --ink-faint: #5d7392;

  /* Accent blues (from logo) */
  --accent: #4b7bb3;
  --accent-light: #7da3d0;
  --accent-pale: #b9cce6;
  --accent-deep: #334b67;

  /* Surfaces that stay light (used sparingly, for contrast) */
  --paper: #f4f6f9;
  --paper-ink: #1b2c42;

  /* Type */
  --font-display: "Fraunces", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  /* Layout */
  --maxw: 1160px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 14px;
  --radius-sm: 8px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg-900);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; }

:focus-visible {
  outline: 2px solid var(--accent-light);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }

/* ---------- Type scale ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-light);
  display: inline-block;
  margin-bottom: 14px;
}
h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 4.2vw, 3.4rem);
  line-height: 1.12;
  color: var(--ink);
  letter-spacing: -0.01em;
}
h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  line-height: 1.18;
  color: var(--ink);
}
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  color: var(--ink);
}
.lede {
  font-size: 1.1rem;
  color: var(--ink-soft);
  max-width: 46ch;
}
p.body-text {
  color: var(--ink-soft);
  max-width: 58ch;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-outline {
  border: 1px solid var(--border);
  color: var(--ink);
}
.btn-outline:hover { border-color: var(--accent-light); color: var(--accent-pale); }

/* ---------- Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 19, 34, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px var(--pad);
  max-width: var(--maxw);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand img { height: 34px; width: auto; }
.brand-name {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.18rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links {
  display: flex;
  gap: 32px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-links a {
  color: var(--ink-dim);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active {
  color: var(--ink);
  border-color: var(--accent);
}
.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}
.lang-switch a, .lang-switch span {
  color: var(--ink-faint);
}
.lang-switch a:hover { color: var(--accent-light); }
.lang-switch .active {
  color: var(--ink);
  font-weight: 600;
}
.lang-switch .sep { color: var(--border); }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--ink);
  cursor: pointer;
  padding: 6px;
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 760px) {
  .nav-links {
    position: fixed;
    inset: 64px 0 0 0;
    background: var(--bg-950);
    flex-direction: column;
    gap: 0;
    padding: 12px 0;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav-links a {
    padding: 16px var(--pad);
    border-bottom: 1px solid var(--border-soft);
    width: 100%;
  }
  .nav-toggle { display: block; }
  .nav-right { gap: 16px; }
}

/* ---------- Hero (Home) ---------- */
.hero-home {
  position: relative;
  overflow: hidden;
  padding: 96px 0 88px;
  background: radial-gradient(ellipse at 70% 20%, #142a47 0%, var(--bg-900) 60%);
}
.hero-home::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("assets/img/hero-network-bg.jpg");
  background-size: cover;
  background-position: center 30%;
  opacity: 0.38;
  mix-blend-mode: screen;
}
.hero-home::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,19,34,0.15) 0%, var(--bg-900) 92%);
}
.hero-home .wrap {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero-home .hero-copy .btn-row { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-shot {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.6);
  transform: rotate(1.2deg);
}
.hero-shot img { width: 100%; }

@media (max-width: 860px) {
  .hero-home .wrap { grid-template-columns: 1fr; }
  .hero-shot { transform: none; }
}

/* ---------- Generic page hero (Services / About / Contact) ---------- */
.hero-page {
  padding: 80px 0 64px;
  background: linear-gradient(180deg, #102135 0%, var(--bg-900) 100%);
  border-bottom: 1px solid var(--border-soft);
}
.hero-page .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero-page-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px -20px rgba(0,0,0,0.55);
}
@media (max-width: 860px) {
  .hero-page .wrap { grid-template-columns: 1fr; }
}

/* ---------- Credibility strip ---------- */
.strip {
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-800);
}
.strip .wrap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 36px;
  padding-bottom: 36px;
}
.strip-item { text-align: center; }
.strip-item .num {
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: var(--accent-pale);
  font-weight: 600;
}
.strip-item .label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 4px;
}
@media (max-width: 700px) {
  .strip .wrap { grid-template-columns: 1fr; gap: 20px; }
}

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section-head { max-width: 640px; margin-bottom: 48px; }

/* ---------- Service preview cards (Home) ---------- */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { border-color: var(--border); transform: translateY(-3px); }
.card .icon-box {
  width: 48px; height: 48px;
  border-radius: 10px;
  background: var(--accent-deep);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.card .icon-box svg { width: 24px; height: 24px; stroke: var(--accent-pale); }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--ink-dim); font-size: 0.96rem; }
.card .more {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--accent-light);
}
@media (max-width: 860px) {
  .cards-3 { grid-template-columns: 1fr; }
}

/* ---------- Manifesto quote ---------- */
.manifesto {
  background: var(--accent-deep);
  padding: 80px 0;
  text-align: center;
}
.manifesto blockquote {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.35;
  color: #fff;
  max-width: 760px;
  margin: 0 auto;
  font-weight: 500;
}
.manifesto cite {
  display: block;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-pale);
  font-style: normal;
}

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--bg-800);
  border-top: 1px solid var(--border-soft);
  padding: 70px 0;
  text-align: center;
}
.cta-band h2 { margin-bottom: 22px; }
.cta-band .wrap { display: flex; flex-direction: column; align-items: center; }

/* ---------- Service detail blocks ---------- */
.service-block {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: start;
  padding: 64px 0;
  border-bottom: 1px solid var(--border-soft);
}
.service-block:last-of-type { border-bottom: none; }
.service-visual {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
.service-visual svg { width: 100%; height: 100%; stroke: var(--accent-light); }
.service-block ul { margin-top: 22px; display: grid; gap: 12px; }
.service-block li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--ink-soft);
  font-size: 0.97rem;
}
.service-block li .arrow { color: var(--accent-light); flex-shrink: 0; }
.service-block li span:last-child { flex: 1; }

@media (max-width: 860px) {
  .service-block { grid-template-columns: 1fr; gap: 28px; }
  .service-visual { max-width: 240px; }
}

/* ---------- Engagement steps (with photos) ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.step-card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.step-photo { aspect-ratio: 4 / 3; overflow: hidden; }
.step-photo img { width: 100%; height: 100%; object-fit: cover; }
.step-photo.icon-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-800);
}
.step-photo.icon-fallback svg { width: 84px; height: 84px; }
.step-body { padding: 24px 24px 28px; }
.step-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-light);
  letter-spacing: 0.06em;
}
.step-body h3 { margin: 10px 0 8px; font-size: 1.15rem; }
.step-body p { color: var(--ink-dim); font-size: 0.92rem; }
@media (max-width: 860px) {
  .steps { grid-template-columns: 1fr; }
}

/* ---------- About: who this is for ---------- */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.audience-card {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.audience-card h3 { margin-bottom: 10px; font-size: 1.1rem; }
.audience-card p { color: var(--ink-dim); font-size: 0.92rem; }
@media (max-width: 860px) {
  .audience-grid { grid-template-columns: 1fr; }
}

.about-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px -20px rgba(0,0,0,0.55);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
}
.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.field input, .field textarea {
  width: 100%;
  background: var(--bg-800);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.96rem;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent-light);
}
.field textarea { resize: vertical; min-height: 130px; }

.contact-info {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 32px 28px;
  align-self: start;
}
.contact-info-row {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-soft);
}
.contact-info-row:last-child { border-bottom: none; }
.contact-info-row .label-mini {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 3px;
}
.contact-info-row .value { color: var(--ink-soft); font-size: 0.95rem; }

@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-950);
  border-top: 1px solid var(--border-soft);
  padding: 56px 0 28px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  padding-bottom: 36px;
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand img { height: 38px; width: auto; }
.footer-brand .fname {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.footer-brand .ftag {
  font-size: 0.82rem;
  color: var(--accent-light);
}
.footer-links {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.footer-col a, .footer-col p {
  display: block;
  color: var(--ink-dim);
  font-size: 0.92rem;
  margin-bottom: 8px;
}
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom {
  border-top: 1px solid var(--border-soft);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.footer-bottom a { color: var(--ink-faint); }
.footer-bottom a:hover { color: var(--accent-light); }

@media (max-width: 700px) {
  .footer-top { flex-direction: column; }
}