/* Couleurs principales */
:root {
  --bleu-fonce: #153665;
  --vert: #22b573;
  --rouge: #d7263d;
  --blanc: #fff;
  --gris-clair: #f6f7fa;
}

body {
  margin: 0;
  font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
  background: var(--gris-clair);
  color: var(--bleu-fonce);
}

.main-container {
  min-height: 100vh;
  display: flex;
  flex-direction: row;
}

/* Header, sidebar, footer de base */
header {
  background: var(--bleu-fonce);
  color: var(--blanc);
  padding: 0;
  position: relative;
}
header img.logo {
  height: 60px;
  margin: 16px 0 8px 40px;
}

footer {
  background: var(--bleu-fonce);
  color: var(--blanc);
  text-align: center;
  padding: 18px 10px 16px 10px;
  letter-spacing: 1px;
}

.sidebar {
  width: 240px;
  background: var(--bleu-fonce);
  color: var(--blanc);
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1001;
  transition: transform 0.3s;
}
.sidebar nav {
  flex: 1 1 auto;
}
.sidebar a {
  display: block;
  color: var(--blanc);
  padding: 20px 32px;
  text-decoration: none;
  font-size: 1.13rem;
  transition: background .2s;
}
.sidebar a.active, .sidebar a:hover {
  background: var(--vert);
  color: var(--blanc);
}

.sidebar .logo-area {
  display: flex;
  align-items: center;
  padding: 32px 0 24px 32px;
}

.sidebar .logo-area img.logo {
  height: 52px;
  margin: 0 16px 0 0;
}

.hamburger {
  display: none;
  position: fixed;
  top: 20px;
  left: 18px;
  z-index: 1200;
  background: transparent;
  border: none;
  cursor: pointer;
}
.hamburger span, .hamburger span:after, .hamburger span:before {
  display: block;
  width: 36px;
  height: 4px;
  background: var(--bleu-fonce);
  margin: 6px 0;
  border-radius: 2px;
  transition: .3s;
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-110%);
    position: fixed;
    min-height: 100vh;
    width: 220px;
  }
  .sidebar.open {
    transform: none;
  }
  .hamburger {
    display: block;
  }
  .main-container {
    padding-left: 0;
  }
}
@media (min-width: 900px) {
  .main-container {
    padding-left: 240px;
  }
  .sidebar {
    position: fixed;
    left: 0;
    transform: none;
  }
  .hamburger {
    display: none;
  }
}

.section {
  padding: 40px 28px;
  background: var(--blanc);
  margin-bottom: 30px;
  box-shadow: 0 1px 8px rgba(21,54,101,0.05);
  border-radius: 10px;
}

.btn {
  display: inline-block;
  background: var(--vert);
  color: var(--blanc);
  padding: 12px 28px;
  border-radius: 100px;
  font-weight: bold;
  letter-spacing: .03em;
  border: 2px solid var(--vert);
  font-size: 1rem;
  text-decoration: none;
  transition: background .25s, color .25s;
}
.btn:hover {background: var(--rouge); border-color: var(--rouge); color: var(--blanc);}

.video-header {
  width: 100%;
  max-height: 380px;
  object-fit: cover;
  border-radius: 8px;
  margin: 0 auto 18px auto;
  display: block;
}

img.responsive-header {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 18px;
  display: block;
}

h1, h2, h3 {
  color: var(--bleu-fonce);
  font-family: 'Segoe UI','Roboto',Arial,sans-serif;
  font-weight: 800;
  letter-spacing: .01em;
}