/* =========================================================
   SIYA Technology — Design System
   v1.0 · Refonte 2026
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght,SOFT@9..144,300..700,30..100&family=Inter:wght@300;400;450;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- Tokens ---------- */
:root {
  /* Palette */
  --navy-900: #050a17;
  --navy-800: #0a1428;
  --navy-700: #101c37;
  --navy-600: #18274a;
  --navy-500: #243561;

  --cyan: #6ec4f5;
  --cyan-soft: #9dd5f7;
  --cyan-deep: #3a99d6;

  --gold: #d4ad7c;
  --gold-soft: #e2c39a;
  --gold-deep: #b58a55;

  --ivory: #f5f1ea;
  --paper: #faf7f2;
  --ink: #0a1428;
  --ink-60: rgba(10,20,40,0.62);
  --ink-40: rgba(10,20,40,0.42);
  --ink-20: rgba(10,20,40,0.18);
  --ink-10: rgba(10,20,40,0.10);
  --ink-06: rgba(10,20,40,0.06);

  --light-60: rgba(245,241,234,0.60);
  --light-40: rgba(245,241,234,0.42);
  --light-20: rgba(245,241,234,0.18);
  --light-10: rgba(245,241,234,0.10);
  --light-06: rgba(245,241,234,0.06);

  /* Type */
  --serif: 'Fraunces', 'Times New Roman', serif;
  --sans: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Spacing */
  --gutter: clamp(20px, 4vw, 56px);
  --section: clamp(72px, 10vw, 144px);

  /* Radius */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 16px;

  /* Motion */
  --ease-out: cubic-bezier(.16,.84,.34,1);
  --ease-in-out: cubic-bezier(.65,.05,.36,1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  font-weight: 400;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
img, svg { display: block; max-width: 100%; }
p { margin: 0; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 400; }

/* ---------- Surfaces ---------- */
.surface-dark {
  background: var(--navy-800);
  color: var(--ivory);
  --hair: var(--light-10);
  --hair-strong: var(--light-20);
  --muted: var(--light-60);
}
.surface-light {
  background: var(--paper);
  color: var(--ink);
  --hair: var(--ink-10);
  --hair-strong: var(--ink-20);
  --muted: var(--ink-60);
}
.surface-ivory { background: var(--ivory); color: var(--ink); --hair: var(--ink-10); --muted: var(--ink-60); }

/* ---------- Layout primitives ---------- */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section { padding: var(--section) 0; }
.section-tight { padding: clamp(56px, 7vw, 96px) 0; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}
@media (max-width: 760px) {
  .grid-12 { grid-template-columns: repeat(4, 1fr); gap: 16px; }
}

/* ---------- Typography ---------- */
.display {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(48px, 8vw, 124px);
  line-height: 0.96;
  letter-spacing: -0.025em;
  font-variation-settings: "opsz" 144, "SOFT" 50;
}
.display .italic { font-style: italic; font-variation-settings: "opsz" 144, "SOFT" 100; }
.display .outline {
  -webkit-text-stroke: 1px currentColor;
  -webkit-text-fill-color: transparent;
  font-style: italic;
}
.h1 {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.022em;
  font-variation-settings: "opsz" 96, "SOFT" 50;
}
.h2 {
  font-family: var(--serif);
  font-weight: 380;
  font-size: clamp(30px, 3.6vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.018em;
  font-variation-settings: "opsz" 72;
}
.h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(22px, 2.2vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.012em;
}
.lede {
  font-family: var(--sans);
  font-weight: 350;
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--muted, var(--ink-60));
  max-width: 60ch;
}
.body { font-size: 16px; line-height: 1.6; color: var(--muted, var(--ink-60)); }
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}
.mono { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; }
.serif-italic { font-family: var(--serif); font-style: italic; font-variation-settings: "opsz" 96, "SOFT" 100; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid var(--hair, var(--ink-10));
  background: color-mix(in srgb, var(--paper) 78%, transparent);
}
.surface-dark .nav { background: color-mix(in srgb, var(--navy-800) 72%, transparent); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--gutter);
  max-width: 1320px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--serif);
  font-weight: 420;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.brand-img {
  height: 32px;
  width: auto;
  display: block;
  flex-shrink: 0;
}
.svc-hero-logo {
  width: 88px;
  height: 88px;
  object-fit: contain;
  display: block;
  margin-bottom: 28px;
  background: rgba(245,241,234,0.05);
  border: 1px solid var(--light-10);
  border-radius: 16px;
  padding: 10px;
}
.brand-mark {
  width: 26px;
  height: 24px;
  background-image: url('siya-mark.svg');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
}
.brand sub {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-left: 6px;
  vertical-align: middle;
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 450;
}
.nav-links a { position: relative; padding: 4px 0; transition: opacity .2s; }
.nav-links a:hover { opacity: .65; }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--cyan);
}
.nav-cta {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  padding: 9px 16px;
  border: 1px solid var(--hair-strong, var(--ink-20));
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: border-color .2s, background .2s;
}
.nav-cta:hover { border-color: currentColor; }

/* Lang toggle FR/EN */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 3px;
  border: 1px solid var(--hair, var(--ink-10));
  border-radius: 999px;
  margin-right: 4px;
}
.lang-toggle button {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--muted, var(--ink-60));
  background: transparent;
  transition: color .2s, background .2s;
}
.lang-toggle button.is-active {
  color: var(--navy-800);
  background: var(--cyan);
}
.surface-dark .lang-toggle button.is-active { color: var(--navy-800); }

@media (max-width: 880px) {
  .nav-links { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .2s var(--ease-out), background .2s, border-color .2s, color .2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--cyan);
  color: var(--navy-800);
}
.btn-primary:hover { background: var(--cyan-soft); }
.btn-ghost {
  border-color: var(--hair-strong, var(--ink-20));
  color: inherit;
}
.btn-ghost:hover { border-color: currentColor; }
.btn-light {
  background: var(--ivory);
  color: var(--navy-800);
}
.btn-arrow { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--hair, var(--light-10));
  padding: 80px 0 36px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 64px;
}
.footer-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 18px;
}
.footer-col a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  opacity: 0.78;
  transition: opacity .2s;
}
.footer-col a:hover { opacity: 1; color: var(--cyan); }
.footer-base {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-top: 32px;
  border-top: 1px solid var(--hair, var(--light-10));
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.55;
}
.footer-wordmark {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(64px, 12vw, 180px);
  line-height: 0.85;
  letter-spacing: -0.04em;
  -webkit-text-stroke: 1px currentColor;
  -webkit-text-fill-color: transparent;
  margin: 32px 0;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- Hairline divider ---------- */
.hr {
  height: 1px;
  background: var(--hair, var(--ink-10));
  margin: 0;
  border: 0;
}

/* ---------- Reveal on scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .9s var(--ease-out), transform .9s var(--ease-out);
}
[data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}
[data-reveal-stagger].is-in > * {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-stagger].is-in > *:nth-child(1) { transition-delay: .04s; }
[data-reveal-stagger].is-in > *:nth-child(2) { transition-delay: .12s; }
[data-reveal-stagger].is-in > *:nth-child(3) { transition-delay: .2s; }
[data-reveal-stagger].is-in > *:nth-child(4) { transition-delay: .28s; }
[data-reveal-stagger].is-in > *:nth-child(5) { transition-delay: .36s; }
[data-reveal-stagger].is-in > *:nth-child(6) { transition-delay: .44s; }
[data-reveal-stagger].is-in > *:nth-child(7) { transition-delay: .52s; }
[data-reveal-stagger].is-in > *:nth-child(8) { transition-delay: .6s; }

/* Respect reduced-motion: skip the hidden initial state, no transitions. */
@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal-stagger] > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  [data-parallax] { transform: none !important; }
  .lang-toggle button { transition: none !important; }
  .nav-cta, .btn { transition: none !important; }
  /* Interactive ecosystem — instant snap instead of stuck transitions */
  .eco-default, .eco-panel,
  .eco-stage [data-node], .eco-stage [data-node] .node-bg,
  .eco-stage [data-node] .node-label, .eco-stage [data-node] .node-glow,
  .eco-stage [data-link] {
    transition: none !important;
  }
  .eco-svg .ring, .eco-svg .node-pulse, .eco-svg .orbit-dot, .eco-svg .flux,
  .soko-anim .float-card, .soko-anim .badge-ping,
  .bns-map .pt-pulse, .bns-map .ring-pulse, .bns-map .route,
  .code-mock .cur {
    animation: none !important;
  }
}

/* ---------- Cards ---------- */
.card {
  border: 1px solid var(--hair, var(--ink-10));
  border-radius: var(--r-md);
  padding: 32px;
  transition: border-color .3s var(--ease-out), background .3s, transform .3s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: var(--hair-strong, var(--ink-20));
}

/* ---------- Service tile ---------- */
.service-tile {
  display: block;
  padding: 36px;
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  position: relative;
  transition: background .3s, border-color .3s;
}
.service-tile::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-md);
  box-shadow: 0 0 0 0 var(--cyan), inset 0 0 0 0 var(--cyan);
  opacity: 0;
  transition: opacity .4s, box-shadow .4s;
  pointer-events: none;
}
.service-tile:hover::after {
  opacity: 0.18;
  box-shadow: 0 0 60px 4px var(--cyan), inset 0 0 0 1px var(--cyan);
}

/* ---------- Glow & accents ---------- */
.glow-cyan {
  position: absolute;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(110,196,245,0.18), transparent 65%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
}
.glow-gold {
  position: absolute;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(212,173,124,0.16), transparent 65%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
}

/* ---------- Numbered list ---------- */
.numbered { list-style: none; padding: 0; margin: 0; counter-reset: n; }
.numbered li {
  display: grid;
  grid-template-columns: 56px 1fr;
  padding: 24px 0;
  border-top: 1px solid var(--hair);
  counter-increment: n;
}
.numbered li::before {
  content: counter(n, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 4px;
}
.numbered li:last-child { border-bottom: 1px solid var(--hair); }

/* ---------- Parallax title ---------- */
[data-parallax] { will-change: transform; }

/* ---------- Tag / pill ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--hair-strong, var(--ink-20));
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tag .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); }

/* ---------- Page transition ---------- */
html.is-leaving body { opacity: 0; transform: translateY(-8px); transition: opacity .25s, transform .25s; }
body { opacity: 1; transition: opacity .35s var(--ease-out), transform .35s var(--ease-out); }

/* ---------- Selection ---------- */
::selection { background: var(--cyan); color: var(--navy-800); }

/* ---------- Mobile spacing tweaks ---------- */
@media (max-width: 600px) {
  .footer-grid { gap: 32px; padding-bottom: 48px; }
  .footer-wordmark { margin: 16px 0; }
  .card { padding: 24px; }
  .service-tile { padding: 24px; }
}

/* ────────────── MOBILE NAV BURGER ────────────── */
.nav-burger {
  display: none;
  background: transparent;
  border: 1px solid var(--light-20);
  border-radius: 6px;
  color: var(--ivory);
  cursor: pointer;
  padding: 8px 10px;
  line-height: 1;
  margin-left: 12px;
}
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--navy-900);
  z-index: 200;
  padding: 80px 32px 40px;
  flex-direction: column;
  overflow-y: auto;
}
.nav-mobile.open { display: flex; }
.nav-mobile-close {
  position: absolute;
  top: 20px; right: 20px;
  background: transparent;
  border: 1px solid var(--light-20);
  border-radius: 6px;
  color: var(--ivory);
  cursor: pointer;
  padding: 8px 12px;
  font-size: 1rem;
  line-height: 1;
}
.nav-mobile-link {
  display: block;
  padding: 18px 0;
  border-bottom: 1px solid var(--light-10);
  font-family: var(--serif);
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 350;
  letter-spacing: -0.02em;
  color: var(--ivory);
  transition: color 0.2s;
}
.nav-mobile-link:hover { color: var(--cyan); }
.nav-mobile-sub {
  padding: 8px 0 8px 20px;
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--light-10);
}
.nav-mobile-sub a {
  padding: 12px 0;
  font-size: 1rem;
  color: var(--light-60);
  border-bottom: 1px solid var(--light-08);
  transition: color 0.2s;
}
.nav-mobile-sub a:last-child { border-bottom: none; }
.nav-mobile-sub a:hover { color: var(--ivory); }
.nav-mobile-sublabel {
  padding: 18px 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--light-40);
}
.nav-mobile-cta {
  margin-top: 32px;
}
@media (max-width: 880px) {
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; align-items: center; gap: 6px; }
  .nav-cta { display: none; }
  .lang-toggle { margin-left: auto; }
}