/* ============================================================
   YINTEK — feuille de style
   Concept : "Équilibre" — deux forces (froide / chaude) en
   superposition. Encre sombre + lumière, accents bleu & ambre.
   ============================================================ */

:root {
  /* Encre (sections sombres) */
  --ink:        #0A0F1E;
  --ink-2:      #111A2E;
  --ink-3:      #18233B;
  --ink-line:   rgba(255, 255, 255, 0.09);
  --ink-line-2: rgba(255, 255, 255, 0.14);

  /* Lumière (sections claires) */
  --cloud:      #FFFFFF;
  --cloud-2:    #F5F7FC;
  --cloud-3:    #EEF1F8;
  --cloud-line: #E3E8F2;

  /* Texte */
  --on-ink:     #EAF0FB;
  --on-ink-mut: #8E99B5;
  --on-cloud:   #0A0F1E;
  --on-cloud-mut:#566080;

  /* Accents — la dualité Yin */
  --cool:       #4F7CFF;   /* force froide  */
  --cool-deep:  #3358E6;
  --cool-soft:  #EAF0FF;
  --warm:       #FFB454;   /* force chaude (contrepoids) */
  --warm-deep:  #F59A2E;

  /* Type */
  --display: "Space Grotesk", system-ui, sans-serif;
  --body:    "Inter", system-ui, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, monospace;

  /* Mesure */
  --maxw: 1160px;
  --gutter: clamp(20px, 5vw, 56px);
  --radius: 18px;
  --radius-sm: 12px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--body);
  background: var(--ink);
  color: var(--on-cloud);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
button { font: inherit; cursor: pointer; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Primitives ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--cool);
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.section-dark .eyebrow { color: var(--warm); }

h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.07; letter-spacing: -0.02em; }

.h-xl { font-size: clamp(2.5rem, 6.2vw, 4.6rem); }
.h-lg { font-size: clamp(2rem, 4.6vw, 3.25rem); }
.h-md { font-size: clamp(1.4rem, 2.4vw, 1.9rem); }

.lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); line-height: 1.62; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15.5px;
  border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--cool);
  color: #fff;
  box-shadow: 0 8px 30px -10px rgba(79,124,255,.7);
}
.btn-primary:hover { background: var(--cool-deep); transform: translateY(-2px); }
.btn-ghost {
  border-color: var(--ink-line-2);
  color: var(--on-ink);
}
.btn-ghost:hover { border-color: var(--on-ink); transform: translateY(-2px); }
.btn-ghost-dark {
  border-color: var(--cloud-line);
  color: var(--on-cloud);
}
.btn-ghost-dark:hover { border-color: var(--on-cloud); transform: translateY(-2px); }
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 15, 30, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--ink-line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.brand { display: flex; align-items: center; gap: 11px; color: var(--on-ink); }
.brand-mark { width: 28px; height: 28px; flex: none; }
.brand-name {
  font-family: var(--display); font-weight: 600; font-size: 1.22rem;
  letter-spacing: -0.01em;
}
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a {
  color: var(--on-ink-mut);
  font-size: 15px; font-weight: 500;
  transition: color .2s var(--ease);
}
.nav-links a:hover { color: var(--on-ink); }
.nav-cta { display: flex; align-items: center; gap: 18px; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; color: var(--on-ink); }
.nav-toggle span { display: block; width: 22px; height: 2px; background: currentColor; margin: 4px 0; transition: .25s var(--ease); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative; overflow: hidden;
  background: var(--ink);
  color: var(--on-ink);
  padding-block: clamp(70px, 12vh, 130px) clamp(80px, 13vh, 150px);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--ink-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 90% at 70% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(120% 90% at 70% 0%, #000 30%, transparent 75%);
  opacity: .5;
}

/* signature : deux cercles (froid + chaud) qui se superposent */
.orb { position: absolute; top: -8%; right: -6%; width: min(640px, 70vw); aspect-ratio: 1; pointer-events: none; }
.orb-circle {
  position: absolute; border-radius: 50%;
  mix-blend-mode: screen; filter: blur(2px);
  width: 64%; height: 64%;
}
.orb-cool {
  top: 6%; left: 0;
  background: radial-gradient(circle at 35% 35%, rgba(79,124,255,.95), rgba(79,124,255,0) 68%);
  animation: drift-a 16s var(--ease) infinite alternate;
}
.orb-warm {
  bottom: 4%; right: 0;
  background: radial-gradient(circle at 60% 60%, rgba(255,180,84,.9), rgba(255,180,84,0) 66%);
  animation: drift-b 18s var(--ease) infinite alternate;
}
@keyframes drift-a { from { transform: translate(0,0) scale(1); } to { transform: translate(7%, 5%) scale(1.06); } }
@keyframes drift-b { from { transform: translate(0,0) scale(1); } to { transform: translate(-6%,-4%) scale(1.05); } }

.hero-inner { position: relative; z-index: 2; max-width: 820px; }
.hero h1 { margin-top: 22px; }
.hero h1 .accent { color: var(--warm); }
.hero .lead { margin-top: 24px; max-width: 600px; color: #C3CCE0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }

.hero-tags {
  position: relative; z-index: 2;
  margin-top: 56px; padding-top: 26px;
  border-top: 1px solid var(--ink-line);
  display: flex; flex-wrap: wrap; gap: 10px 26px;
  font-family: var(--mono); font-size: 13px; letter-spacing: .04em;
  color: var(--on-ink-mut);
}
.hero-tags span { display: inline-flex; align-items: center; gap: 9px; }
.hero-tags span::before { content:""; width:6px; height:6px; border-radius:50%; background: var(--cool); }
.hero-tags span:nth-child(even)::before { background: var(--warm); }

/* ============================================================
   SECTIONS
   ============================================================ */
.section { padding-block: clamp(72px, 11vh, 120px); }
.section-dark { background: var(--ink); color: var(--on-ink); }
.section-cloud { background: var(--cloud); color: var(--on-cloud); }
.section-cloud-2 { background: var(--cloud-2); color: var(--on-cloud); }

.section-head { max-width: 640px; }
.section-head h2 { margin-top: 16px; }
.section-head p { margin-top: 16px; color: var(--on-cloud-mut); }
.section-dark .section-head p { color: var(--on-ink-mut); }

/* ---------- Services ---------- */
.service-grid {
  margin-top: 54px;
  display: grid; gap: 18px;
  grid-template-columns: repeat(2, 1fr);
}
.service {
  background: var(--cloud); border: 1px solid var(--cloud-line);
  border-radius: var(--radius); padding: 30px 30px 34px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.service:hover { transform: translateY(-4px); box-shadow: 0 24px 50px -28px rgba(10,15,30,.35); border-color: #cdd6e8; }
.service-ico {
  width: 50px; height: 50px; border-radius: 13px;
  display: grid; place-items: center;
  background: var(--cool-soft); color: var(--cool-deep);
  margin-bottom: 20px;
}
.service:nth-child(even) .service-ico { background: #FFF3E1; color: var(--warm-deep); }
.service h3 { font-size: 1.32rem; }
.service p { margin-top: 11px; color: var(--on-cloud-mut); font-size: 15.5px; }
.service-list { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.service-list li {
  font-family: var(--mono); font-size: 12px; letter-spacing: .02em;
  padding: 5px 11px; border-radius: 999px;
  background: var(--cloud-2); color: var(--on-cloud-mut);
  border: 1px solid var(--cloud-line);
}

/* ---------- Process ---------- */
.steps { margin-top: 54px; display: grid; gap: 1px; background: var(--ink-line); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--ink-line); }
.step { background: var(--ink); padding: 30px clamp(22px,3vw,34px); display: grid; grid-template-columns: 64px 1fr; gap: 8px 22px; align-items: start; }
.step-num { font-family: var(--mono); font-size: 14px; color: var(--cool); padding-top: 4px; }
.step:nth-child(even) .step-num { color: var(--warm); }
.step h3 { font-size: 1.28rem; }
.step p { color: var(--on-ink-mut); font-size: 15.5px; grid-column: 2; }

/* ---------- About ---------- */
.about-copy { max-width: 720px; }
.about-copy p + p { margin-top: 18px; }
.about-copy p { color: var(--on-cloud-mut); }
.about-copy .lead { color: var(--on-cloud); }
.inline-link { color: var(--cool-deep); text-decoration: underline; text-underline-offset: 3px; font-weight: 500; }
.inline-link:hover { color: var(--cool); }

/* ---------- Contact (simple) ---------- */
.contact-simple { max-width: 680px; text-align: center; margin-inline: auto; }
.contact-simple .eyebrow::before { display: none; }
.contact-simple .eyebrow { justify-content: center; }
.contact-simple h2 { margin-top: 16px; }
.contact-simple .lead { margin-top: 18px; color: var(--on-ink-mut); }
.contact-mail {
  display: inline-flex; align-items: center; gap: 14px;
  margin-top: 38px; padding: 16px 28px 16px 22px;
  border-radius: 999px;
  background: var(--ink-2); border: 1px solid var(--ink-line-2);
  font-family: var(--mono); font-size: clamp(1rem, 2.2vw, 1.2rem); color: var(--on-ink);
  transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}
.contact-mail:hover { border-color: var(--cool); transform: translateY(-2px); background: var(--ink-3); }
.contact-mail-ico {
  width: 42px; height: 42px; flex: none; border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(79,124,255,.16); color: var(--cool);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: #070B16; color: var(--on-ink); padding-block: 60px 34px; border-top: 1px solid var(--ink-line); }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand p { color: var(--on-ink-mut); font-size: 14.5px; max-width: 320px; }
.footer-legal { color: var(--on-ink) !important; font-size: 14px; line-height: 1.85; opacity: .85; margin: 0; }
.footer-legal strong { font-weight: 600; }
.footer-legal .mono { font-family: var(--mono); font-size: 12.5px; color: var(--on-ink-mut); }
.footer-col h4 { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--on-ink-mut); margin-bottom: 16px; font-weight: 500; }
.footer-col a, .footer-col p { display: block; color: var(--on-ink); font-size: 14.5px; margin-bottom: 11px; opacity: .85; transition: opacity .2s; }
.footer-col a:hover { opacity: 1; color: var(--cool); }
.footer-bottom {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--ink-line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: var(--on-ink-mut);
}
.footer-bottom .mono { font-family: var(--mono); }

/* ============================================================
   PAGE LÉGALE (privacy / mentions)
   ============================================================ */
.legal-hero { background: var(--ink); color: var(--on-ink); padding-block: clamp(56px,9vh,96px) clamp(40px,6vh,64px); border-bottom: 1px solid var(--ink-line); }
.legal-hero .lead { color: var(--on-ink-mut); margin-top: 16px; max-width: 620px; }
.legal-hero .updated { font-family: var(--mono); font-size: 12.5px; color: var(--warm); margin-top: 20px; letter-spacing: .04em; }
.legal-back { font-family: var(--mono); font-size: 13px; color: var(--on-ink-mut); display:inline-flex; gap:8px; align-items:center; margin-bottom: 24px; }
.legal-back:hover { color: var(--cool); }

.legal-body { background: var(--cloud); color: var(--on-cloud); padding-block: clamp(48px,7vh,80px); }
.legal-body .wrap { max-width: 820px; }
.legal-body h2 { font-size: clamp(1.3rem,2.4vw,1.7rem); margin-top: 46px; padding-top: 6px; }
.legal-body h2:first-child { margin-top: 0; }
.legal-body h3 { font-size: 1.12rem; margin-top: 26px; font-family: var(--body); font-weight: 700; }
.legal-body p, .legal-body li { color: #2C3548; font-size: 16px; }
.legal-body p { margin-top: 14px; }
.legal-body ul { margin-top: 14px; padding-left: 0; }
.legal-body ul li { position: relative; padding-left: 24px; margin-top: 10px; }
.legal-body ul li::before { content:""; position:absolute; left: 4px; top: 11px; width: 7px; height: 7px; border-radius: 50%; background: var(--cool); }
.legal-body a { color: var(--cool-deep); text-decoration: underline; text-underline-offset: 2px; }
.legal-toc { background: var(--cloud-2); border: 1px solid var(--cloud-line); border-radius: var(--radius); padding: 24px 28px; margin-bottom: 40px; }
.legal-toc h4 { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--on-cloud-mut); margin-bottom: 14px; }
.legal-toc ol { margin: 0; padding-left: 20px; color: var(--on-cloud-mut); }
.legal-toc li { margin-bottom: 7px; font-size: 14.5px; }
.legal-toc a { color: var(--on-cloud); text-decoration: none; }
.legal-toc a:hover { color: var(--cool-deep); }
.legal-table { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 15px; }
.legal-table th, .legal-table td { text-align: left; padding: 12px 14px; border: 1px solid var(--cloud-line); vertical-align: top; }
.legal-table th { background: var(--cloud-2); font-weight: 600; }

/* ---------- Focus visible ---------- */
:focus-visible { outline: 2px solid var(--cool); outline-offset: 3px; border-radius: 4px; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
  .service-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: block; }
  .site-header.open .nav-links {
    display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
    position: absolute; left: 0; right: 0; top: 70px;
    background: var(--ink); border-bottom: 1px solid var(--ink-line);
    padding: 14px var(--gutter) 22px;
  }
  .site-header.open .nav-links a { padding: 10px 0; font-size: 17px; width: 100%; }
  .hero-tags { gap: 8px 18px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; }
}