:root {
  --bg: #0b1020;
  --bg-alt: #121729;
  --card: #181f35;
  --accent: #4fd1c5;
  --accent-soft: rgba(79, 209, 197, 0.15);
  --text: #edf2f7;
  --muted: #a0aec0;
  --border: #2d3748;
  --radius: 10px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font-main);
  background: radial-gradient(circle at top, #1a365d 0, #0b1020 50%, #020309 100%);
  color: var(--text);
  line-height: 1.6;
}

/* Layout */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 8vw;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(11, 16, 32, 0.9), rgba(11, 16, 32, 0.7));
}

.logo-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

h1 {
  font-size: 1.35rem;
  margin: 0;
}

.subtitle {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.9rem;
}

.nav a:hover {
  color: var(--accent);
}

main {
  padding: 32px 8vw 60px;
}

/* Hero */

.hero {
  max-width: 780px;
  margin: 40px 0 32px;
}

.hero h2 {
  font-size: 2.1rem;
  margin-bottom: 10px;
}

.hero p {
  color: var(--muted);
  max-width: 640px;
}

.btn-primary {
  display: inline-block;
  margin-top: 18px;
  padding: 10px 22px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #63b3ed);
  color: #0b1020;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow);
}

/* Sections */

.section {
  margin-top: 40px;
}

.section h2 {
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.section-alt {
  background: linear-gradient(to right, rgba(26, 32, 44, 0.9), rgba(26, 32, 44, 0.65));
  padding: 26px 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(79, 209, 197, 0.15);
}

/* Services */

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.service-card {
  background: linear-gradient(145deg, var(--card), #111827);
  border-radius: var(--radius);
  padding: 16px 16px 18px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
}

.service-card h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

.service-card .tagline {
  font-weight: 500;
  color: #e2e8f0;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 0.9rem;
  margin: 0 0 6px;
}

.service-card .stack {
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  padding-top: 6px;
}

/* Approach */

.approach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.approach-grid h3 {
  margin-top: 0;
  font-size: 1rem;
}

.approach-grid p {
  font-size: 0.9rem;
  color: #e2e8f0;
}

/* Contact */

.contact-list {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  font-size: 0.9rem;
}

.contact-list li {
  margin-bottom: 4px;
}

.contact-list a {
  color: var(--accent);
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 14px 8vw 18px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* Responsive */

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .nav a {
    margin-left: 0;
    margin-right: 14px;
  }

  .hero h2 {
    font-size: 1.7rem;
  }
}

/* Boutons Demo + RDV */
.btn-demo {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 14px;
  background: rgba(79, 209, 197, 0.2);
  color: var(--accent);
  text-decoration: none;
  border: 1px solid rgba(79, 209, 197, 0.4);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
}

.btn-demo:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.cta-buttons {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn-secondary {
  padding: 10px 22px;
  border-radius: 999px;
  background: transparent;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  border: 1px solid var(--accent-soft);
  font-size: 0.95rem;
}

.btn-secondary:hover {
  background: var(--accent-soft);
}

/* Projets Demo */
.project-section {
  max-width: 900px;
  margin: 0 auto 60px;
}

.project-demo {
  background: linear-gradient(145deg, var(--card), #111827);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.demo-before-after {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: start;
  margin-bottom: 16px;
}

.demo-item {
  background: rgba(79, 209, 197, 0.05);
  padding: 16px;
  border-radius: 8px;
  border-left: 4px solid var(--accent);
}

.demo-item h3 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.demo-item ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.demo-item li {
  padding: 4px 0;
  font-size: 0.9rem;
}

.demo-arrow {
  font-size: 1.8rem;
  color: var(--accent);
  font-weight: bold;
  align-self: center;
  margin: 0 8px;
}

.demo-result {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0;
}

/* Responsive projets */
@media (max-width: 720px) {
  .demo-before-after {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .demo-arrow {
    display: none;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn-primary, .btn-secondary {
    text-align: center;
  }
}