/* === Base & Thème ======================================================= */

:root {
  /* Couleurs (clair) */
  --brand-1: #1a355b;
  --brand-2: #6c3ec1;
  --brand-3: #3ec6e0;

  --bg-1: #ffffff;
  --bg-2: #f5f7fb;
  --text-1: #0f172a;
  --text-2: #475569;
  --border: #e5e7eb;
  --shadow: 0 1px 2px rgba(2, 6, 23, 0.08), 0 6px 24px rgba(2, 6, 23, 0.06);
  --ring: color-mix(in oklab, var(--brand-2) 55%, white 45%);

  /* Rythme */
  --radius-s: 10px;
  --radius-m: 14px;
  --radius-l: 22px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  --container-w: 1100px;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-1: #0b1220;
    --bg-2: #0f182b;
    --text-1: #e5e7eb;
    --text-2: #94a3b8;
    --border: #1f2937;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 30px rgba(0, 0, 0, 0.25);
    --ring: color-mix(in oklab, var(--brand-3) 60%, black 40%);
  }
}

/* Réduction mouvements */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text-1);
  background: radial-gradient(1200px 600px at 80% -10%, color-mix(in oklab, var(--brand-3) 10%, transparent 90%), transparent 70%) no-repeat,
              var(--bg-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg { display: block; max-width: 100%; }

/* Accessibilité focus */
:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: 6px;
}

/* Liens génériques */
a {
  color: var(--brand-1);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* Wrapper / conteneur */
.wrapper {
  width: min(var(--container-w), 92%);
  margin-inline: auto;
}

/* === En-tête sticky + nav burger ======================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg-1) 75%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  color: var(--text-1);
  text-decoration: none;
}
.brand-text { letter-spacing: 0.2px; }
.brand-mark .logo { color: var(--brand-1); }

/* Toggle burger (checkbox caché) */
.nav-toggle {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  white-space: nowrap;
  clip-path: inset(50%);
  clip: rect(0 0 0 0);
  overflow: hidden;
}

/* Bouton burger */
.nav-toggle-btn {
  --bar-h: 2px;
  --btn: 40px;
  inline-size: var(--btn);
  block-size: var(--btn);
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in oklab, var(--bg-1) 85%, transparent);
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, transform .2s ease;
}
.nav-toggle-btn:hover { background: color-mix(in oklab, var(--bg-2) 70%, transparent); }

.nav-toggle-btn span,
.nav-toggle-btn span::before,
.nav-toggle-btn span::after {
  display: block;
  width: 22px;
  height: var(--bar-h);
  background: var(--text-1);
  border-radius: 2px;
  position: relative;
  transition: transform .25s ease, opacity .2s ease, top .25s ease, bottom .25s ease;
}
.nav-toggle-btn span::before,
.nav-toggle-btn span::after {
  content: "";
  position: absolute;
  left: 0;
}
.nav-toggle-btn span::before { top: -7px; }
.nav-toggle-btn span::after  { bottom: -7px; }

/* Nav par défaut (mobile: masquée) */
.site-nav {
  position: fixed;
  inset: 0 0 0 30%;
  translate: 100% 0;
  background: var(--bg-1);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: translate .35s ease;
  padding: var(--space-12) var(--space-8);
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}
.site-nav a {
  display: inline-block;
  font-weight: 600;
  color: var(--text-1);
  padding: var(--space-3) var(--space-4);
  border-radius: 10px;
  text-decoration: none;
  transition: background .2s ease, color .2s ease;
}
.site-nav a:hover {
  background: var(--bg-2);
  text-decoration: none;
}

/* Ouverture via checkbox */
#nav-toggle:checked ~ .nav-toggle-btn span { background: transparent; }
#nav-toggle:checked ~ .nav-toggle-btn span::before {
  top: 0;
  transform: rotate(45deg);
}
#nav-toggle:checked ~ .nav-toggle-btn span::after {
  bottom: 0;
  transform: rotate(-45deg);
}
#nav-toggle:checked ~ .site-nav { translate: 0 0; }

/* Desktop */
@media (width >= 900px) {
  .nav-toggle-btn { display: none; }
  .site-nav {
    position: static;
    inset: auto;
    translate: none;
    background: transparent;
    border: 0;
    padding: 0;
    box-shadow: none;
  }
  .site-nav ul {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
  .site-nav a {
    padding: var(--space-2) var(--space-4);
    border-radius: 999px;
  }
}

/* === Hero =============================================================== */

.hero {
  padding: clamp(var(--space-10), 6vw, 5rem) 0;
  background:
    radial-gradient(600px 300px at 15% -10%, color-mix(in oklab, var(--brand-2) 20%, transparent), transparent 60%) no-repeat,
    linear-gradient(180deg, color-mix(in oklab, var(--brand-1) 4%, transparent), transparent 35%);
}
.hero-inner {
  display: grid;
  align-items: center;
  gap: var(--space-8);
}
@media (width >= 900px) {
  .hero-inner {
    grid-template-columns: 1.05fr .95fr;
  }
}

.hero-copy h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.02em;
}
.accent { color: var(--brand-2); }

.lead {
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  color: var(--text-2);
  margin: 0 0 var(--space-6);
}

.cta { display: flex; flex-wrap: wrap; gap: var(--space-3); }

.btn {
  --btn-bg: var(--bg-2);
  --btn-tx: var(--text-1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--btn-bg);
  color: var(--btn-tx);
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
  transition: transform .12s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: translateY(0); }

.btn.primary {
  border: 0;
  color: white;
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2) 55%, var(--brand-3));
  box-shadow: 0 6px 20px color-mix(in oklab, var(--brand-2) 30%, transparent);
}
.btn.primary:hover {
  box-shadow: 0 10px 28px color-mix(in oklab, var(--brand-2) 40%, transparent);
}

.hero-visual { max-width: 560px; margin-inline: auto; }
.hero-svg { width: 100%; height: auto; }

/* === Section "Features" / cartes ======================================= */

.features {
  padding: clamp(var(--space-10), 6vw, 4rem) 0 clamp(var(--space-12), 8vw, 5rem);
}

.features h2 {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  margin: 0 0 var(--space-6);
  letter-spacing: -0.01em;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: var(--space-4);
  padding: 0;
  list-style: none;
}

.card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: var(--space-6);
  box-shadow: var(--shadow);
  display: grid;
  align-content: start;
  gap: var(--space-3);
  min-height: 200px;
  transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(2, 6, 23, 0.08);
  border-color: color-mix(in oklab, var(--brand-2) 35%, var(--border));
}
.card h3 {
  margin: 0;
  font-size: 1.125rem;
}
.card p {
  margin: 0 0 var(--space-4);
  color: var(--text-2);
}

.card-link {
  align-self: end;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .75rem;
  border-radius: 999px;
  font-weight: 600;
  color: var(--brand-1);
  text-decoration: none;
  background: color-mix(in oklab, var(--brand-3) 8%, transparent);
  transition: background .2s ease, transform .12s ease;
}
.card-link:hover {
  background: color-mix(in oklab, var(--brand-3) 14%, transparent);
  text-decoration: none;
  transform: translateY(-1px);
}

/* === Pied de page ======================================================= */

.site-footer {
  border-top: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg-1) 82%, transparent);
}
.site-footer .wrapper {
  padding: var(--space-6) 0;
  color: var(--text-2);
  font-size: .95rem;
  text-align: center;
}

/* === Petites retouches responsives ===================================== */

@media (width < 540px) {
  .cta .btn { flex: 1 1 auto; }
  .hero-visual { max-width: 420px; }
}

/* Améliore la lisibilité des SVG aux thèmes */
svg { color: var(--text-1); }