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

:root {
  --noir: #111;
  --gris: #555;
  --gris-clair: #f5f5f5;
  --blanc: #fff;
  --accent: #1a1a1a;
}

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--noir);
  line-height: 1.6;
  background: var(--blanc);
}

a {
  color: inherit;
  text-decoration: none;
}

/* NAV */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 4rem;
  border-bottom: 1px solid #e5e5e5;
  position: sticky;
  top: 0;
  background: var(--blanc);
  z-index: 100;
}

nav .logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

nav .links {
  display: flex;
  gap: 2rem;
  list-style: none;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

nav .links a:hover {
  opacity: 0.5;
  transition: opacity 0.2s;
}

/* HERO */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem;
  background: var(--gris-clair);
}

.hero h1 {
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.05rem;
  color: var(--gris);
  max-width: 520px;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-block;
  padding: 0.85rem 2.5rem;
  background: var(--noir);
  color: var(--blanc);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover {
  background: #333;
}

/* SECTIONS */
section {
  padding: 5rem 4rem;
}

section.alt {
  background: var(--gris-clair);
}

section h2 {
  font-size: 1.6rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
  text-align: center;
}

section .subtitle {
  text-align: center;
  color: var(--gris);
  max-width: 600px;
  margin: 0 auto 3rem;
  font-size: 0.95rem;
}

/* GRID CATEGORIES */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.card {
  background: var(--blanc);
  padding: 2.5rem 2rem;
  text-align: center;
  border: 1px solid #e5e5e5;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}

.card p {
  font-size: 0.85rem;
  color: var(--gris);
}

/* AVANTAGES */
.avantages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.avantage h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.avantage p {
  font-size: 0.85rem;
  color: var(--gris);
}

/* CONTACT */
.contact-info {
  max-width: 500px;
  margin: 0 auto;
  text-align: center;
  color: var(--gris);
  font-size: 0.95rem;
}

.contact-info p {
  margin-bottom: 0.5rem;
}

.contact-info a {
  text-decoration: underline;
}

/* FOOTER */
footer {
  border-top: 1px solid #e5e5e5;
  padding: 2.5rem 4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--gris);
}

footer .footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

footer a:hover {
  text-decoration: underline;
}

/* LEGAL */
.legal {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.legal h1 {
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
}

.legal h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.8rem;
  text-align: left;
}

.legal p, .legal li {
  font-size: 0.9rem;
  color: var(--gris);
  margin-bottom: 0.6rem;
}

.legal ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  nav {
    padding: 1rem 1.5rem;
    flex-direction: column;
    gap: 1rem;
  }

  nav .links {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  section {
    padding: 3rem 1.5rem;
  }

  .hero {
    padding: 5rem 1.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  footer {
    padding: 2rem 1.5rem;
    flex-direction: column;
    text-align: center;
  }
}