:root {
  --cyan: #00d4ff;
  --cyan-dim: #38bdf8;
  --navy: #0a1628;
  --navy-mid: #132337;
  --navy-light: #1e3a5f;
  --white: #f8fafc;
  --gray: #94a3b8;
  --card: rgba(19, 35, 55, 0.85);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--navy);
  color: var(--white);
  line-height: 1.6;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; }

/* Header */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.nav img.logo { height: 44px; width: auto; }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a { color: var(--white); font-size: 0.95rem; font-weight: 500; text-decoration: none; }
.nav-links a:hover { color: var(--cyan); }
.btn {
  display: inline-block; padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--cyan), #0284c7);
  color: var(--navy); font-weight: 600; border-radius: 8px;
  text-decoration: none; border: none; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,212,255,0.3); text-decoration: none; }
.btn-outline {
  background: transparent; color: var(--cyan);
  border: 2px solid var(--cyan);
}
.btn-outline:hover { background: rgba(0,212,255,0.1); color: var(--cyan); }

/* Hero / Banner */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding-top: 72px;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    linear-gradient(105deg, var(--navy) 40%, transparent 70%),
    url('../assets/banner.svg') center/cover no-repeat;
}
.hero-grid {
  position: absolute; inset: 0; opacity: 0.15;
  background-image:
    radial-gradient(circle at 20% 50%, var(--cyan) 1px, transparent 1px),
    linear-gradient(var(--cyan) 1px, transparent 1px),
    linear-gradient(90deg, var(--cyan) 1px, transparent 1px);
  background-size: 40px 40px, 80px 80px, 80px 80px;
}
.hero-content { position: relative; z-index: 2; max-width: 640px; padding: 4rem 0; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800; line-height: 1.15; margin-bottom: 1rem;
}
.hero h1 span { color: var(--cyan); }
.hero-tagline {
  border-left: 3px solid var(--cyan);
  padding-left: 1.25rem; margin: 1.5rem 0 2rem;
  font-size: 1.15rem; color: var(--gray);
}
.hero-tagline strong { color: var(--cyan-dim); }

/* Sections */
section { padding: 5rem 0; }
section h2 {
  font-size: 2rem; margin-bottom: 0.5rem;
  background: linear-gradient(90deg, var(--white), var(--cyan-dim));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-sub { color: var(--gray); margin-bottom: 3rem; max-width: 600px; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--card);
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 16px; padding: 2rem;
  transition: border-color 0.3s, transform 0.3s;
}
.card:hover {
  border-color: rgba(0, 212, 255, 0.4);
  transform: translateY(-4px);
}
.card-icon {
  width: 48px; height: 48px; margin-bottom: 1rem;
  background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(30,58,138,0.3));
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
}
.card h3 { font-size: 1.15rem; margin-bottom: 0.75rem; }
.card p { color: var(--gray); font-size: 0.95rem; }

/* Tech stack */
.tech-grid {
  display: flex; flex-wrap: wrap; gap: 0.75rem;
}
.tech-tag {
  padding: 0.5rem 1rem;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 999px; font-size: 0.85rem; color: var(--cyan-dim);
}

/* CTA */
.cta {
  text-align: center; padding: 4rem 2rem;
  background: linear-gradient(135deg, var(--navy-mid), var(--navy-light));
  border-radius: 24px; border: 1px solid rgba(0,212,255,0.15);
}
.cta h2 { -webkit-text-fill-color: var(--white); margin-bottom: 1rem; }
.cta p { color: var(--gray); margin-bottom: 2rem; }
.cta-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* Footer */
footer {
  padding: 3rem 0; border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center; color: var(--gray); font-size: 0.9rem;
}
footer .brand { color: var(--cyan); font-weight: 700; }

/* Responsive */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-content { padding: 2rem 0; }
}
.demo-hero {
  min-height: 60vh;
  padding-top: 100px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  text-align: center;
}
.demo-hero h1 { font-size: 2.5rem; margin-bottom: 1rem; }
.demo-hero p { color: var(--gray); max-width: 600px; margin: 0 auto 2rem; }

.demo-card {
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.demo-card::after {
  content: '→ Démo';
  position: absolute; bottom: 1.5rem; right: 1.5rem;
  color: var(--cyan); font-weight: 600; font-size: 0.9rem;
}
.demo-card .status {
  display: inline-block; margin-top: 1rem;
  padding: 0.25rem 0.75rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600;
}
.status.live { background: rgba(34,197,94,0.15); color: #4ade80; }
.status.preview { background: rgba(250,204,21,0.15); color: #facc15; }

.demo-page { padding-top: 100px; min-height: 100vh; }
.demo-header { margin-bottom: 2rem; }
.demo-header a.back { color: var(--gray); font-size: 0.9rem; }
.demo-panel {
  background: var(--card);
  border: 1px solid rgba(0,212,255,0.12);
  border-radius: 16px; padding: 2rem; margin-bottom: 1.5rem;
}
.demo-panel h3 { margin-bottom: 1rem; color: var(--cyan); }
.metric-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem; margin: 1.5rem 0;
}
.metric {
  text-align: center; padding: 1.25rem;
  background: rgba(0,212,255,0.05); border-radius: 12px;
}
.metric .val { font-size: 1.75rem; font-weight: 700; color: var(--cyan); }
.metric .lbl { font-size: 0.8rem; color: var(--gray); }

.arch-diagram {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center;
  padding: 2rem; margin: 1rem 0;
}
.arch-node {
  padding: 1rem 1.5rem; border: 2px solid var(--cyan);
  border-radius: 12px; text-align: center; min-width: 120px;
  background: rgba(0,212,255,0.05);
}
.arch-arrow { align-self: center; color: var(--cyan); font-size: 1.5rem; }

.panorama {
  width: 100%; height: 400px; border-radius: 16px;
  background: linear-gradient(135deg, #1e3a5f, #0a1628);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.panorama .hint { color: var(--gray); z-index: 2; }
.panorama .orbit {
  position: absolute; width: 300px; height: 300px;
  border: 2px dashed rgba(0,212,255,0.3); border-radius: 50%;
  animation: spin 20s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.checklist { list-style: none; }
.checklist li {
  padding: 0.75rem 0; border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex; align-items: center; gap: 0.75rem;
}
.checklist li::before { content: '✓'; color: #4ade80; font-weight: bold; }