:root {
  --bg: #0b0d12;
  --elev: #121826;
  --card: #161d2f;
  --text: #e8ecf2;
  --muted: #a7b1c2;
  --accent: #7bffca;
  --accent2: #b79cff;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --gap: clamp(16px, 2vw, 28px);
  --container: min(1100px, 92vw);
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: radial-gradient(
      1200px 600px at 70% -10%,
      #182036,
      transparent 60%
    ),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.container {
  width: var(--container);
  margin-inline: auto;
}
a {
  color: inherit;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: fixed;
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  padding: 10px 12px;
  background: #1f2a44;
  color: #fff;
  border-radius: 8px;
  z-index: 9999;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  background: rgba(11, 13, 18, 0.6);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.brand__logo {
  font-size: 20px;
}
.site-nav {
  display: flex;
  gap: 16px;
  align-items: center;
}
.site-nav a {
  padding: 8px 10px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--muted);
}
.site-nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

/* Buttons */
.btn {
  --bg: #1f2a44;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6ch;
  padding: 12px 18px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  background: var(--bg);
  border: 1px solid rgba(255, 255, 255, 0.14);
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn--sm {
  padding: 8px 12px;
  font-size: 14px;
}
.btn--lg {
  padding: 16px 22px;
  font-size: 18px;
}
.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #0b0d12;
  font-weight: 700;
}
.btn--secondary {
  background: #222b44;
}
.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.18);
}

/* Hero */
.hero {
  position: relative;
  isolation: isolate;
  min-height: 100dvh;
  display: grid;
  align-items: center;
  overflow: clip;
}
.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__video,
.hero__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.08);
}
.hero__video {
  opacity: 0.35;
  filter: saturate(0.9) brightness(0.7) contrast(1.05);
}
.hero__image {
  display: none;
}
.hero__content {
  text-align: left;
  padding-block: 80px 40px;
  position: relative;
  z-index: 1;
}
.tag {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  backdrop-filter: blur(4px);
}
.title {
  margin: 10px 0 8px;
  font-size: clamp(36px, 5vw, 68px);
  line-height: 1.05;
}
.accent {
  color: var(--accent);
  text-shadow: 0 0 24px rgba(123, 255, 202, 0.35);
}
.subtitle {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: clamp(16px, 1.7vw, 20px);
}
.actions {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin: 20px 0;
}

/* Sections */
.section {
  padding: clamp(48px, 8vw, 120px) 0;
}
.section__title {
  font-size: clamp(28px, 3vw, 40px);
  letter-spacing: 0.2px;
  margin: 0 0 18px;
}

/* Answers */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}
@media (max-width: 980px) {
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 560px) {
  .grid-4 {
    grid-template-columns: 1fr;
  }
}
.card {
  background: linear-gradient(180deg, var(--card) 0%, #111625 100%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}
.card p {
  margin: 0;
  color: var(--muted);
}

/* Background */
.background {
  background: radial-gradient(
      800px 400px at 10% 110%,
      #1a2033 0%,
      transparent 60%
    ),
    linear-gradient(180deg, #0b0d12 0%, #0b0d1200 40% 60%, #0b0d12 100%);
}
.bg-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--gap);
  align-items: start;
}
@media (max-width: 920px) {
  .bg-layout {
    grid-template-columns: 1fr;
  }
}
.bullets {
  margin: 16px 0 0;
  padding-left: 1.1rem;
}
.note {
  margin-top: 14px;
  color: var(--muted);
}
.bg-figure {
  background: #0f1524;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow);
}
.bg-figure img {
  border-radius: 10px;
}
.bg-figure figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

/* CTA */
.cta__box {
  background: linear-gradient(
    135deg,
    rgba(123, 255, 202, 0.2),
    #10172a 40%,
    #10172a 60%,
    rgba(183, 156, 255, 0.2)
  );
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: calc(var(--radius) + 4px);
  padding: clamp(24px, 4vw, 40px);
  box-shadow: var(--shadow);
  text-align: center;
}
.cta__subtitle {
  color: var(--muted);
  margin-bottom: 18px;
}
.cta__footnote {
  color: var(--muted);
  margin-top: 12px;
}

/* Footer */
.site-footer {
  padding: 28px 0 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  background: #0b0d12;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}
.footer-nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-nav a {
  text-decoration: none;
  color: var(--muted);
}
.footer-nav a:hover {
  color: var(--text);
}
.copy {
  color: var(--muted);
  margin: 0;
}

/* Motion reduce */
:root,
[data-motion="reduce"] * {
  transition: none !important;
  animation: none !important;
}
@media (prefers-reduced-motion: reduce) {
  .btn:hover {
    transform: none;
  }
  .hero__video {
    transform: none;
  }
}

/* Video fallback: si la vidéo ne charge pas, on montre l'image */
.no-video .hero__video {
  display: none;
}
.no-video .hero__image {
  display: block;
}