/* CSS critique pour mobile - LCP optimisé */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: white;
  overflow-x: hidden;
}

/* Header critique */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(10px);
  padding: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Hero section critique */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem 1rem;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(45deg, #1DB954, #ff6b35);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(1rem, 3vw, 1.25rem);
  margin-bottom: 2rem;
  opacity: 0.9;
  max-width: 600px;
}

/* Boutons critiques */
.btn-primary {
  background: linear-gradient(45deg, #1DB954, #ff6b35);
  border: none;
  padding: 1rem 2rem;
  border-radius: 50px;
  color: white;
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  transition: transform 0.2s ease;
  text-decoration: none;
  display: inline-block;
  margin: 0.5rem;
}

.btn-primary:hover {
  transform: translateY(-2px);
}

/* Loading spinner critique */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-left: 4px solid #1DB954;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 2rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive mobile */
@media (max-width: 768px) {
  .hero {
    padding: 1rem;
    min-height: 80vh;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .btn-primary {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    width: 100%;
    max-width: 300px;
  }
}