body {
  margin: 0;
  font-family: 'Segoe UI', Roboto, sans-serif;
  background: #f8fafc;
  color: #111827;
}

/* HEADER */
header {
  background: #000; /* noir */
  color: white;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header img {
  height: 60px; /* logo plus grand */
}
header h1 {
  margin: 0;
  font-size: 1.5rem;
}

/* FORMULAIRE */
main {
  padding: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.card form {
  max-width: 800px; /* limite la largeur des champs */
  margin: 0 auto;
}

input, textarea, select {
  width: 100%;
  max-width: 100%; /* empêche de dépasser */
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  font-size: 15px;
  box-sizing: border-box;
}

/* MENU */
nav {
  background: #f1f5f9;
  padding: 12px 32px;
  display: flex;
  gap: 12px;
  border-bottom: 1px solid #e5e7eb;
}
nav a {
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 500;
  color: #2563eb;
  background: white;
  border: 1px solid #dbeafe;
  transition: all 0.2s;
}
nav a:hover {
  background: #2563eb;
  color: white;
}

/* MAIN */
main {
  padding: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

/* CARDS */
.card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.card h2 { margin-top: 0; font-size: 1.25rem; margin-bottom: 12px; }

/* FORM INPUTS */
label { display: block; font-weight: 500; margin-bottom: 6px; }
input, textarea, select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  margin-bottom: 16px;
  font-size: 14px;
}
input:focus, textarea:focus, select:focus {
  border-color: #2563eb;
  outline: none;
  box-shadow: 0 0 0 3px #bfdbfe;
}

/* BUTTONS */
.btn {
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}
.btn.primary { background: #2563eb; color: white; }
.btn.primary:hover { background: #1d4ed8; }
.btn.secondary { background: white; color: #2563eb; border: 1px solid #2563eb; }
.btn.secondary:hover { background: #2563eb; color: white; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.flash {
  background: #ecfdf5;
  border: 1px solid #10b981;
  color: #065f46;
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 16px;
}
.err {
  background: #fef2f2;
  border: 1px solid #ef4444;
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 16px;
}

/* Grille YouTube */
.yt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.yt-card {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  overflow: hidden;
  transition: transform 0.2s;
}
.yt-card:hover {
  transform: translateY(-4px);
}
.yt-card img {
  width: 100%;
  display: block;
}
.yt-card h4 {
  margin: 10px;
  font-size: 14px;
  font-weight: 600;
}
.yt-card p {
  margin: 0 10px 10px;
  font-size: 13px;
  color: #6b7280;
}
.yt-card .actions {
  padding: 10px;
  text-align: center;
}

.flash.success {
  background: #e8fff0;
  color: #0a6533;
  border: 1px solid #b6f2c4;
  padding: 10px 15px;
  border-radius: 6px;
  margin-bottom: 15px;
  font-size: 15px;
}