:root {
  --primary: #2a9d8f;
  --secondary: #264653;
  --bg-color: #ffffff;
  --text-color: #171717;
  --text-muted: #4a4a4a;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(42, 157, 143, 0.2);
  --card-shadow: 0 8px 32px 0 rgba(38, 70, 83, 0.08);
  --grain-opacity: 0.03;
  --radius: 16px;
  --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  --font-main: 'Montserrat', 'Open Sans', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* Texture de grain subtile */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3ExternalIcon %3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Typographie - Respect de la syntaxe française */
h1, h2, h3, h4 {
  color: var(--secondary);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  text-transform: none; /* Pas de majuscules systématiques */
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 1.85rem; border-left: 4px solid var(--primary); padding-left: 1rem; }
h3 { font-size: 1.4rem; }

p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
}

a:hover {
  color: var(--secondary);
  opacity: 0.8;
}

/* Architecture Bento Grid */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: minmax(150px, auto);
  gap: 2rem;
  width: 100%;
}

.bento-item {
  background: var(--bg-color);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.bento-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px 0 rgba(38, 70, 83, 0.12);
}

/* Glassmorphism pour les éléments flottants */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
}

/* Formes et Boutons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  background-color: var(--primary);
  color: #ffffff;
  border-radius: 50px;
  font-weight: 600;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
}

.btn:hover {
  background-color: var(--secondary);
  color: #ffffff;
  transform: scale(1.02);
}

.btn-secondary {
  background-color: var(--secondary);
}

/* Navigation */
nav {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.logo {
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--secondary);
  text-transform: lowercase;
}

.logo span {
  color: var(--primary);
}

/* Exercices et Programmes */
.exercise-card {
  border-bottom: 2px solid var(--primary);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--glass-border);
  color: var(--secondary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Optimisation Mobile */
@media (max-width: 992px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-item {
    grid-column: span 2 !important;
  }
}

@media (max-width: 600px) {
  h1 { font-size: 2rem; }
  .container { padding: 1rem; }
  nav { padding: 0 1rem; }
  .bento-grid { gap: 1rem; }
}

/* Utilitaires de hiérarchie */
.section-title {
  text-align: center;
  max-width: 700px;
  margin: 4rem auto 3rem;
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.text-white {
  color: #ffffff !important;
}

/* Section Hero pour la page d'accueil avec contraste optimisé */
.hero {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
  color: #ffffff;
  padding: 8rem 1rem;
  text-align: center;
  border-radius: 0 0 var(--radius) var(--radius);
  margin-bottom: 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hero h1, .hero h2, .hero p {
  color: #ffffff;
}

.hero p {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0.95;
}

/* SEO Friendly Hidden elements */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Focus states pour l'accessibilité */
a:focus, button:focus {
  outline: 3px solid rgba(42, 157, 143, 0.3);
  outline-offset: 2px;
}