/* ==================================================
   WAI — Site corporate
   Style éditorial minimal, motifs géométriques discrets.
   ================================================== */

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .35s var(--ease), color .35s var(--ease);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

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

/* ============ TYPOGRAPHY ============ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--accent);
}
.lead {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 560px;
}

/* ============ LINKS w/ underline animation ============ */
.link-underline {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.link-underline::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .3s var(--ease);
}
.link-underline:hover::after { transform: scaleX(1); transform-origin: left; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
  white-space: nowrap;
}
.btn--primary {
  background: var(--ink);
  color: var(--bg);
}
[data-theme="dark"] .btn--primary { background: var(--accent-gold); color: #0A1510; }
.btn--primary:hover { background: var(--accent); color: var(--accent-contrast); transform: translateY(-2px); box-shadow: var(--shadow-accent); }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ============ NAV ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background-color .35s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav__wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  gap: 28px;
}
.nav__logo {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.01em;
}
.nav__logo .ai { color: var(--accent-gold); }
.nav__links {
  display: flex;
  gap: 36px;
  margin-left: auto;
}
.nav__links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color .2s;
}
.nav__links a:hover,
.nav__links a.active { color: var(--ink); }
.nav__cta { padding: 11px 20px; font-size: 13px; }

.nav__actions { display: flex; align-items: center; gap: 14px; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .2s, color .2s, transform .3s var(--ease);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav__burger span {
  width: 22px; height: 1.5px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .2s;
}

/* ============ PATTERN (kita motif) ============ */
.pattern {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .5;
  color: var(--accent);
}
.pattern svg { width: 100%; height: 100%; }
[data-theme="dark"] .pattern { opacity: .35; }

/* ============ HERO ============ */
.hero {
  position: relative;
  padding: 168px 0 120px;
  overflow: hidden;
}
.hero__pattern {
  position: absolute;
  top: 0; right: -10%;
  width: 60%; height: 100%;
  opacity: .06;
  color: var(--accent);
  mask-image: linear-gradient(to left, black, transparent);
  -webkit-mask-image: linear-gradient(to left, black, transparent);
}
.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.3fr .9fr;
  gap: 64px;
  align-items: end;
}
.hero__title {
  font-size: clamp(44px, 6.4vw, 84px);
  line-height: 1.04;
  font-weight: 600;
  letter-spacing: -.02em;
  margin: 22px 0 28px;
}
.hero__title em {
  font-style: italic;
  color: var(--accent);
}
.hero__subtitle {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: 480px;
  margin-bottom: 36px;
}
.hero__cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero__side {
  border-left: 1px solid var(--line);
  padding-left: 40px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.hero__stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
}
.hero__stat span {
  font-size: 13px;
  color: var(--ink-soft);
}

/* ============ SECTIONS ============ */
.section { padding: 110px 0; }
.section--raised {
  background: var(--bg-raised);
  --bg-raised: var(--bg);
  --bg: var(--bg-sunken);
}
.section__head {
  max-width: 680px;
  margin-bottom: 64px;
}
.section__head h2 {
  font-size: clamp(32px, 4.2vw, 52px);
  line-height: 1.12;
  margin: 16px 0 18px;
}
.section__head h2 em { font-style: italic; color: var(--accent); }

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

/* ============ ABOUT ============ */
.about {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 72px;
  align-items: start;
}
.about__pillars {
  display: grid;
  gap: 36px;
}
.about__pillar {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.about__pillar:first-child { border-top: none; padding-top: 0; }
.about__pillar-num {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--ink-faint);
}
.about__pillar h3 {
  font-size: 19px;
  margin-bottom: 8px;
}
.about__pillar p { color: var(--ink-soft); font-size: 15px; }

/* ============ PRODUCTS ============ */
.products {
  display: grid;
  gap: 28px;
}
.product-card {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px;
  border-radius: var(--radius-lg);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color .3s var(--ease), transform .35s var(--ease), box-shadow .35s var(--ease);
}
.product-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.product-card__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
.product-card h3 {
  font-size: clamp(26px, 3.2vw, 38px);
  margin-bottom: 14px;
}
.product-card p {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 440px;
  margin-bottom: 28px;
}
.product-card__meta {
  display: flex;
  gap: 28px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.product-card__meta div b {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
}
.product-card__meta div span {
  font-size: 12px;
  color: var(--ink-soft);
}
.product-card__visual {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-soft) 0%, transparent 100%);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.product-card__visual .pattern { opacity: .35; }
.product-card__mark {
  font-family: var(--font-display);
  font-size: 96px;
  font-weight: 600;
  letter-spacing: -.04em;
  color: var(--accent);
  opacity: .9;
}

.product-card--placeholder {
  grid-template-columns: 1fr;
  padding: 48px;
  text-align: center;
  border-style: dashed;
  color: var(--ink-faint);
}
.product-card--placeholder p { margin: 0 auto; max-width: 100%; }

/* ============ CONTACT / OFFICES ============ */
.offices {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.office {
  padding: 36px;
  border-radius: var(--radius);
  background: var(--bg-raised);
  border: 1px solid var(--line);
}
.office__flag {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.office h3 {
  font-size: 21px;
  margin-bottom: 20px;
}
.office ul {
  display: grid;
  gap: 10px;
}
.office li {
  font-size: 14px;
  color: var(--ink-soft);
  display: flex;
  gap: 10px;
}
.office li a:hover { color: var(--accent); }
.office__label {
  flex: 0 0 90px;
  color: var(--ink-faint);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .1em;
  padding-top: 1px;
}

.legal-strip {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}
.legal-strip div small {
  display: block;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 6px;
}
.legal-strip div b { font-size: 15px; font-weight: 600; }

/* ============ CTA BLOCK ============ */
.cta-block {
  position: relative;
  padding: 100px 0;
  background: var(--ink);
  color: var(--bg);
  overflow: hidden;
}
[data-theme="dark"] .cta-block { background: var(--bg-sunken); }
.cta-block .pattern { color: var(--accent); opacity: .12; }
.cta-wrap {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-wrap h2 {
  font-size: clamp(30px, 4vw, 46px);
  color: var(--bg);
  max-width: 480px;
}
.cta-wrap h2 em { font-style: italic; color: var(--accent); }
[data-theme="dark"] .cta-wrap h2 { color: var(--ink); }
.cta-block .btn--primary {
  background: var(--accent-gold);
  color: #0A1510;
}
.cta-block .btn--primary:hover { background: var(--bg); color: var(--ink); }
[data-theme="dark"] .cta-block .btn--primary:hover { background: var(--ink); color: var(--bg); }

/* ============ FOOTER ============ */
.footer { padding: 80px 0 32px; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}
.footer__about {
  color: var(--ink-soft);
  font-size: 14px;
  max-width: 320px;
  margin-top: 16px;
}
.footer h5 {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 18px;
}
.footer ul { display: grid; gap: 10px; }
.footer ul a {
  font-size: 14px;
  color: var(--ink-soft);
  transition: color .2s;
}
.footer ul a:hover { color: var(--accent); }
.footer__bottom {
  padding-top: 28px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer__bottom small { color: var(--ink-faint); font-size: 12px; }

/* ============ REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ============ RESPONSIVE ============ */
@media (max-width: 960px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .hero__side { border-left: none; border-top: 1px solid var(--line); padding-left: 0; padding-top: 28px; flex-direction: row; flex-wrap: wrap; }
  .about { grid-template-columns: 1fr; gap: 48px; }
  .product-card { grid-template-columns: 1fr; padding: 36px; gap: 32px; }
  .product-card__visual { order: -1; }
  .offices { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 640px) {
  .nav__wrap { height: 72px; }
  .hero { padding: 128px 0 80px; }
  .section { padding: 72px 0; }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { justify-content: center; }
  .cta-wrap { flex-direction: column; align-items: flex-start; }
  .cta-wrap .btn { width: 100%; justify-content: center; }
  .legal-strip { gap: 24px; }
}

/* ============ MOBILE NAV OPEN ============ */
.nav__links.open {
  display: flex;
  position: absolute;
  top: 72px; left: 0; right: 0;
  flex-direction: column;
  gap: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 8px 28px 20px;
  z-index: 49;
}
.nav__links.open a { padding: 12px 0; border-bottom: 1px solid var(--line); }
.nav__links.open a:last-child { border-bottom: none; }
@media (min-width: 961px) {
  .nav__burger { display: none; }
}