/* KeepScale — feuille de style unique, sans dépendance */

:root {
	--brand: #2e83c8;
	--brand-light: #89b2d4;
	--brand-strong: #1f6aa8;
	--ink: #0f2238;
	--text: #2b3a4a;
	--muted: #5a6b7d;
	--line: #dfe6ee;
	--bg: #ffffff;
	--bg-alt: #f4f7fa;
	--surface: #ffffff;
	--tag-bg: #eaf2fa;
	--tag-text: #1f5a8c;
	--header-bg: rgba(255, 255, 255, 0.85);
	--dark: #0f2238;
	--on-dark: #e8eef5;
	--on-dark-muted: #a9bacb;

	--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	--radius: 12px;
	--radius-sm: 8px;
	--shadow: 0 1px 2px rgba(15, 34, 56, 0.06), 0 8px 24px rgba(15, 34, 56, 0.06);
	--shadow-hover: 0 2px 4px rgba(15, 34, 56, 0.08), 0 16px 40px rgba(15, 34, 56, 0.10);
	--ease: cubic-bezier(.2, .7, .2, 1);
	--header-h: 68px;
}

@media (prefers-color-scheme: dark) {
	:root {
		--brand: #5aa3e0;
		--brand-light: #89b2d4;
		--brand-strong: #7db7e8;
		--ink: #eef3f8;
		--text: #c9d5e1;
		--muted: #94a6b8;
		--line: #23364b;
		--bg: #0b1726;
		--bg-alt: #0f1f33;
		--surface: #12243a;
		--tag-bg: #17304c;
		--tag-text: #b7d4ef;
		--header-bg: rgba(11, 23, 38, 0.85);
		--dark: #071120;
		--shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
		--shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.35), 0 16px 40px rgba(0, 0, 0, 0.35);
	}
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
	margin: 0;
	font-family: var(--font);
	font-size: 1.0625rem;
	line-height: 1.65;
	color: var(--text);
	background: var(--bg);
	-webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { color: var(--ink); line-height: 1.2; margin: 0 0 .5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); font-weight: 800; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.65rem, 3.2vw, 2.4rem); font-weight: 750; letter-spacing: -0.02em; }
h3 { font-size: 1.15rem; font-weight: 700; }
h4 { font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
p { margin: 0 0 1em; }
a { color: var(--brand-strong); text-underline-offset: 3px; }
a:hover { color: var(--brand); }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; border-radius: 4px; }
address { font-style: normal; }
img, svg { display: block; max-width: 100%; }

.sprite { display: none; }
.icon { width: 1.15em; height: 1.15em; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: 16px; top: -100px; z-index: 100; background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: var(--radius-sm); }
.skip-link:focus { top: 12px; }

.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }

/* Boutons */
.btn {
	display: inline-flex; align-items: center; gap: .5em;
	padding: .8em 1.4em; border-radius: 999px;
	background: var(--brand-strong); color: #fff;
	font-weight: 650; font-size: 1rem; text-decoration: none;
	border: 1px solid transparent;
	transition: background .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease), color .2s;
}
.btn:hover { color: #fff; background: var(--brand); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(46, 131, 200, 0.3); }
.btn .icon { transition: transform .2s var(--ease); }
.btn:hover .icon { transform: translateX(3px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--bg-alt); color: var(--ink); box-shadow: none; }
.btn-small { padding: .5em 1.1em; font-size: .95rem; }
.btn-light { background: #fff; color: var(--dark); }
.btn-light:hover { background: var(--on-dark); color: var(--dark); }
@media (prefers-color-scheme: dark) {
	.btn { color: var(--dark); }
	.btn:hover { color: var(--dark); }
	.btn-ghost, .btn-ghost:hover { color: var(--ink); }
}

/* En-tête */
.site-header {
	position: sticky; top: 0; z-index: 50;
	background: var(--header-bg);
	-webkit-backdrop-filter: saturate(180%) blur(12px);
	backdrop-filter: saturate(180%) blur(12px);
	border-bottom: 1px solid transparent;
	transition: border-color .3s, box-shadow .3s;
}
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: 0 4px 20px rgba(15, 34, 56, 0.05); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; fill: var(--brand); }
.brand-mark .light { fill: var(--brand-light); }
.brand-name { font-size: 1.35rem; font-weight: 800; color: var(--brand); letter-spacing: -0.02em; }
.brand-name span { color: var(--brand-light); font-weight: 600; }

.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 6px; }
.site-nav a:not(.btn) {
	display: block; padding: .5em .8em; border-radius: var(--radius-sm);
	color: var(--text); text-decoration: none; font-weight: 550; font-size: .97rem;
	transition: color .2s, background .2s;
}
.site-nav a:not(.btn):hover, .site-nav a[aria-current="true"] { color: var(--brand-strong); background: var(--bg-alt); }
.site-nav .btn { margin-left: 8px; }

.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: transparent; cursor: pointer; position: relative; }
.nav-toggle-bar, .nav-toggle-bar::before, .nav-toggle-bar::after {
	position: absolute; left: 11px; width: 20px; height: 2px; background: var(--ink); border-radius: 2px;
	transition: transform .25s var(--ease), opacity .2s;
}
.nav-toggle-bar { top: 50%; margin-top: -1px; }
.nav-toggle-bar::before, .nav-toggle-bar::after { content: ""; left: 0; }
.nav-toggle-bar::before { transform: translateY(-6px); }
.nav-toggle-bar::after { transform: translateY(6px); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before { transform: rotate(45deg); background: var(--ink); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after { transform: rotate(-45deg); background: var(--ink); }

@media (max-width: 900px) {
	.js .nav-toggle { display: block; }
	.js .site-nav {
		position: absolute; top: var(--header-h); left: 0; right: 0;
		background: var(--bg); border-bottom: 1px solid var(--line);
		box-shadow: 0 16px 30px rgba(15, 34, 56, 0.08);
		visibility: hidden; opacity: 0; transform: translateY(-8px);
		transition: opacity .2s, transform .25s var(--ease), visibility 0s .25s;
	}
	.js .site-nav.is-open { visibility: visible; opacity: 1; transform: none; transition: opacity .2s, transform .25s var(--ease); }
	.js .site-nav ul { flex-direction: column; align-items: stretch; padding: 12px 24px 20px; gap: 2px; }
	.js .site-nav .btn { margin: 10px 0 0; justify-content: center; }
	.site-nav ul { flex-wrap: wrap; }
}

/* Hero */
.hero {
	position: relative; overflow: hidden;
	padding: clamp(64px, 11vw, 132px) 0 clamp(56px, 8vw, 96px);
	background:
		radial-gradient(60% 60% at 85% 10%, rgba(46, 131, 200, 0.14), transparent 70%),
		radial-gradient(50% 50% at 0% 100%, rgba(137, 178, 212, 0.16), transparent 70%),
		var(--bg);
}
.hero::after {
	content: ""; position: absolute; inset: 0; pointer-events: none;
	background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
	background-size: 48px 48px;
	-webkit-mask-image: radial-gradient(70% 60% at 70% 30%, #000, transparent 75%);
	mask-image: radial-gradient(70% 60% at 70% 30%, #000, transparent 75%);
	opacity: .5;
}
.hero-inner { position: relative; z-index: 1; }
.hero h1 { max-width: 16ch; }
.accent { color: var(--brand); }
.eyebrow { font-size: .82rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--brand-strong); margin-bottom: 1em; }
.lead { font-size: clamp(1.08rem, 1.6vw, 1.25rem); max-width: 62ch; color: var(--muted); margin-bottom: 2em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.key-figures {
	list-style: none; margin: clamp(48px, 7vw, 80px) 0 0; padding: 28px 0 0;
	display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
	border-top: 1px solid var(--line);
}
.key-figures strong { display: block; font-size: 1.5rem; font-weight: 800; color: var(--ink); letter-spacing: -0.02em; }
.key-figures span { display: block; font-size: .93rem; color: var(--muted); line-height: 1.45; margin-top: 4px; }

/* Animation d'entrée du hero */
@media (prefers-reduced-motion: no-preference) {
	.hero-inner > * { animation: rise .8s var(--ease) both; }
	.hero-inner > :nth-child(2) { animation-delay: .08s; }
	.hero-inner > :nth-child(3) { animation-delay: .16s; }
	.hero-inner > :nth-child(4) { animation-delay: .24s; }
	.hero-inner > :nth-child(5) { animation-delay: .34s; }
}
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }

/* Sections */
.section { padding: clamp(64px, 9vw, 112px) 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin-bottom: clamp(36px, 5vw, 56px); }
.section-head > p:last-child { color: var(--muted); font-size: 1.08rem; }
.subhead { margin: clamp(48px, 6vw, 72px) 0 24px; font-size: 1.35rem; }

/* Cartes services */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
	background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
	padding: 28px; box-shadow: var(--shadow);
	transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--brand-light); }
.card-icon {
	width: 44px; height: 44px; padding: 10px; margin-bottom: 18px;
	border-radius: 10px; background: var(--tag-bg); color: var(--brand-strong);
	fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.card p { color: var(--muted); font-size: .98rem; }
.card ul { list-style: none; margin: 0; padding: 16px 0 0; border-top: 1px solid var(--line); }
.card li { position: relative; padding-left: 20px; font-size: .94rem; margin: 6px 0; }
.card li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 7px; height: 7px; border-radius: 2px; background: var(--brand-light); }

/* Secteurs */
.sectors { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.sector { padding: 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--brand); }
.sector p { color: var(--muted); font-size: .95rem; margin: 0; }

/* Technologies */
.stack { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 32px; }
.tags { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tags li {
	padding: .32em .8em; border-radius: 999px; font-size: .9rem; font-weight: 550;
	background: var(--tag-bg); color: var(--tag-text);
	transition: background .2s, color .2s;
}
.tags li:hover { background: var(--brand-strong); color: #fff; }

/* Méthode */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.steps li { position: relative; padding: 64px 24px 24px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); counter-increment: step; }
.steps li::before {
	content: "0" counter(step);
	position: absolute; top: 20px; left: 24px;
	font-size: 1.6rem; font-weight: 800; color: var(--brand-light); letter-spacing: -0.02em;
}
.steps p { color: var(--muted); font-size: .96rem; margin: 0; }

/* Engagements */
.values { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px 40px; }
.values li { position: relative; padding-left: 40px; }
.values li::before {
	content: ""; position: absolute; left: 0; top: 2px; width: 26px; height: 26px; border-radius: 50%;
	background: var(--tag-bg);
}
.values li::after {
	content: ""; position: absolute; left: 8px; top: 9px; width: 10px; height: 6px;
	border-left: 2px solid var(--brand-strong); border-bottom: 2px solid var(--brand-strong); transform: rotate(-45deg);
}
.values p { color: var(--muted); font-size: .97rem; margin: 0; }

/* FAQ */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
	cursor: pointer; list-style: none; padding: 20px 40px 20px 0; position: relative;
	font-weight: 650; color: var(--ink); font-size: 1.05rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
	content: ""; position: absolute; right: 8px; top: 50%; width: 10px; height: 10px; margin-top: -7px;
	border-right: 2px solid var(--brand); border-bottom: 2px solid var(--brand);
	transform: rotate(45deg); transition: transform .25s var(--ease);
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq summary:hover { color: var(--brand-strong); }
.faq details p { color: var(--muted); padding-right: 40px; margin: -4px 0 20px; }

/* Contact */
.contact { background: var(--dark); color: var(--on-dark); position: relative; overflow: hidden; }
.contact::before {
	content: ""; position: absolute; right: -10%; top: -40%; width: 60%; height: 180%;
	background: radial-gradient(closest-side, rgba(46, 131, 200, 0.35), transparent);
	pointer-events: none;
}
.contact-inner { position: relative; display: grid; grid-template-columns: 7fr 5fr; gap: clamp(32px, 6vw, 80px); align-items: center; }
.contact h2 { color: #fff; }
.contact .eyebrow { color: var(--brand-light); }
.contact p { color: var(--on-dark-muted); font-size: 1.08rem; max-width: 56ch; margin-bottom: 1.8em; }
.contact-list { display: grid; gap: 12px; }
.contact-list a, .contact-list span {
	display: flex; align-items: center; gap: 14px;
	padding: 16px 20px; border-radius: var(--radius);
	background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.1);
	color: var(--on-dark); text-decoration: none; font-weight: 550;
	transition: background .2s, border-color .2s;
}
.contact-list a:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.25); color: #fff; }
.contact-list .icon { color: var(--brand-light); width: 1.3em; height: 1.3em; }

/* Pied de page */
.site-footer { background: var(--dark); color: var(--on-dark-muted); border-top: 1px solid rgba(255, 255, 255, 0.08); font-size: .9rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding-top: 24px; padding-bottom: 24px; }
.footer-inner p { margin: 0; }
.site-footer a { color: var(--on-dark); }
.site-footer a:hover { color: #fff; }

/* Pages simples (mentions légales, 404) */
.page { padding: clamp(48px, 8vw, 96px) 0; min-height: 60vh; }
.page h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); margin-bottom: .8em; }
.page h2 { font-size: 1.3rem; margin-top: 2em; }
.page p, .page li { color: var(--text); }

/* Apparition au défilement (uniquement si JS et animations autorisées) */
@media (prefers-reduced-motion: no-preference) {
	.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
	.js .reveal.is-visible { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after { transition: none !important; animation: none !important; }
}

/* Responsive */
@media (max-width: 1024px) {
	.cards { grid-template-columns: repeat(2, 1fr); }
	.sectors, .steps, .values { grid-template-columns: repeat(2, 1fr); }
	.stack { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
	.container { padding: 0 16px; }
	.key-figures { grid-template-columns: repeat(2, 1fr); }
	.contact-inner { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
	.cards, .sectors, .steps, .stack, .values { grid-template-columns: 1fr; }
	.card { padding: 22px; }
	.hero-actions .btn { flex: 1 1 100%; justify-content: center; }
}

@media print {
	.site-header, .hero::after, .contact::before { display: none; }
	.js .reveal { opacity: 1; transform: none; }
	.contact, .site-footer { background: none; color: #000; }
}