/* ===== RESET & VARIABLES ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #FAFAF8;
  --bg-warm: #F5F0EB;
  --bg-card: #FFFFFF;
  --bg-dark: #1A1A1A;
  --accent: #C45D3E;
  --accent-soft: #E8A990;
  --accent-bg: rgba(196, 93, 62, 0.06);
  --accent-border: rgba(196, 93, 62, 0.15);
  --heading: #1A1A1A;
  --text: #4A4A4A;
  --text-light: #8A8A8A;
  --border: #E8E4DF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.06);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.08);
  --radius: 16px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'DM Serif Display', serif;
  color: var(--heading);
  line-height: 1.2;
}

/* ===== NAV ===== */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 1.2rem 3rem;
  display: flex; justify-content: space-between; align-items: center;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all 0.4s;
}
nav.scrolled {
  padding: 0.9rem 3rem;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.nav-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.4rem; color: var(--heading); text-decoration: none;
}
.nav-logo .logo-ia { color: var(--accent); font-style: italic; }
.nav-links { display: flex; gap: 2.5rem; list-style: none; }
.nav-links a {
  color: var(--text); text-decoration: none; font-size: 0.9rem;
  font-weight: 500; transition: color 0.3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-cta {
  padding: 0.6rem 1.6rem; background: var(--heading); border: none;
  border-radius: 50px; color: white; font-family: 'DM Sans', sans-serif;
  font-weight: 600; font-size: 0.85rem; text-decoration: none;
  transition: all 0.3s; cursor: pointer;
}
.nav-cta:hover { background: var(--accent); transform: translateY(-1px); }

/* ===== HAMBURGER MENU ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 1002;
}
.hamburger span {
  width: 24px; height: 2px;
  background: var(--heading);
  border-radius: 2px;
  transition: all 0.3s;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-menu {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(250, 250, 248, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1001;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: 'DM Serif Display', serif;
  font-size: 1.5rem;
  color: var(--heading);
  text-decoration: none;
  transition: color 0.3s;
}
.mobile-menu a:hover { color: var(--accent); }
.mobile-menu .mobile-cta {
  margin-top: 1rem;
  padding: 0.9rem 2rem;
  background: var(--heading);
  border-radius: 50px;
  color: white;
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.3s;
}
.mobile-menu .mobile-cta:hover { background: var(--accent); }

/* ===== BUTTONS ===== */
.btn {
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 0.95rem; font-weight: 600;
  text-decoration: none; cursor: pointer;
  border: none; transition: all 0.3s;
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'DM Sans', sans-serif;
}
.btn-primary { background: var(--heading); color: white; }
.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(196, 93, 62, 0.2);
}
.btn-secondary {
  background: transparent;
  color: var(--heading);
  border: 2px solid var(--heading);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* ===== FOOTER ===== */
footer {
  padding: 2.5rem 3rem;
  background: var(--bg-dark);
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.08);
}
footer p {
  color: rgba(255,255,255,0.35);
  font-size: 0.82rem;
}
footer a {
  color: rgba(255,255,255,0.35);
  text-decoration: none;
  transition: color 0.3s;
}
footer a:hover { color: rgba(255,255,255,0.6); }

/* ===== SECTION LABEL (réutilisable) ===== */
.section-label {
  font-size: 0.78rem; font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}
.section-label--accent { color: var(--accent); }
.section-label--soft { color: var(--accent-soft); }
.section-label--muted { color: var(--text-light); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  nav { padding: 1rem 1.5rem; }
  nav.scrolled { padding: 0.8rem 1.5rem; }
  .nav-links { display: none; }
  .nav-cta:not(.mobile-cta) { display: none; }
  .hamburger { display: flex; }

  footer { padding: 2rem 1.5rem; }
}