/* ============================= */
/* DESIGN SYSTEM MODERNE 2024 */
/* Variables et tokens de design */
/* ============================= */

:root {
  /* Couleurs principales - Palette moderne */
  --color-primary: #ffffff;
  --color-secondary: #000000;
  --color-accent: rgba(255, 255, 255, 0.1);
  --color-accent-hover: rgba(255, 255, 255, 0.2);
  
  /* Glassmorphism amélioré */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-blur: 20px;
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
  
  /* Typographie moderne */
  --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Tailles de police - Scale moderne */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  --font-size-4xl: 2.5rem;    /* 40px */
  --font-size-5xl: 3rem;      /* 48px */
  
  /* Espacements - 8px grid system */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  
  /* Rayons de bordure */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  
  /* Transitions et animations */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Ombres modernes */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.1);
  
  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-menu: 10000;
  --z-menu-button: 11000;
}

/* ============================= */
/* UTILITAIRES MODERNES */
/* ============================= */

/* Smooth scrolling amélioré */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Focus visible moderne */
*:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* Sélection de texte stylisée */
::selection {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-primary);
}

::-moz-selection {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-primary);
}

/* ============================= */
/* ANIMATIONS MODERNES */
/* ============================= */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Classes d'animation utilitaires */
.animate-fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

.animate-slide-up {
  animation: slideInUp var(--transition-base) ease-out;
}

.animate-scale-in {
  animation: scaleIn var(--transition-base) ease-out;
}

/* ============================= */
/* GLASSMORPHISM MODERNE */
/* ============================= */

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-strong {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.25);
}

/* ============================= */
/* BOUTONS MODERNES */
/* ============================= */

.btn-modern {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background: var(--color-accent);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-modern::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-modern:hover::before {
  width: 300px;
  height: 300px;
}

.btn-modern:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-modern:active {
  transform: translateY(0);
}

/* ============================= */
/* TYPOGRAPHIE MODERNE */
/* ============================= */

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-glow {
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.3),
               0 0 40px rgba(255, 255, 255, 0.2),
               0 0 60px rgba(255, 255, 255, 0.1);
}

/* ============================= */
/* EFFETS DE HOVER MODERNES */
/* ============================= */

.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.hover-glow {
  transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
}

/* ============================= */
/* RESPONSIVE BREAKPOINTS */
/* ============================= */

@media (max-width: 768px) {
  :root {
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2rem;
    --font-size-5xl: 2.5rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 3rem;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-2xl: 1.25rem;
    --font-size-3xl: 1.5rem;
    --font-size-4xl: 1.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.25rem;
  }
}