:root {
  /* 1. LA SOURCE DE VÉRITÉ (Les Chiffres RGB) */
  --white-rgb: 255, 255, 255;
  --black-rgb: 0, 0, 0;
  --primary-rgb: 124, 58, 237;  /* Electric Violet brand color */
  --danger-rgb: 239, 68, 68;
  --success-rgb: 22, 163, 74;
  --warning-rgb: 245, 158, 11;

  /* Neutres (Slate) */
  --gray-50:  #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0; 
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b; 
  --gray-700: #334155; 
  --gray-900: #0f172a; 

  /* 2. LES ALIAS (Calculés automatiquement) */
  
  /* Couleurs Solides (Générées via RGB) */
  --white: rgb(var(--white-rgb));
  --black: rgb(var(--black-rgb));
  
  --primary: rgb(var(--primary-rgb));
  --primary-hover: #6d28d9;
  --primary-light: #f5f3ff;
  --primary-gradient: linear-gradient(135deg, rgb(124, 58, 237) 0%, rgb(6, 182, 212) 100%);
  
  --danger: rgb(var(--danger-rgb));
  --success: rgb(var(--success-rgb));
  --warning: rgb(var(--warning-rgb));

  /* Alias Sémantiques (Mode Clair par défaut) */
  --bg-main: var(--gray-50);
  --bg-card: var(--white);      
  --bg-input: var(--white);
  --bg-hero: var(--gray-900); 
  
  --border: rgba(15, 23, 42, 0.08);
  
  --text-main: var(--gray-900);
  --text-muted: var(--gray-500);
  --text-inverse: var(--white);       
  --text-inverse-muted: var(--gray-300);

  --bg-glass-header: rgba(255, 255, 255, 0.7);
  --border-glass-header: rgba(15, 23, 42, 0.06);

  /* 3. EFFETS (Transparences dynamiques) */

  --shadow-primary-glow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
  
  /* Glassmorphism (Verre) */
  --bg-glass: rgba(var(--white-rgb), 0.1);
  --bg-glass-hover: rgba(var(--white-rgb), 0.2);
  --border-glass: rgba(var(--white-rgb), 0.3);
  --border-glass-visible: rgba(var(--white-rgb), 0.6); 

  /* UI & Géométrie */
  --ui-height: 48px; 
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 16px;
  
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  --ring-focus: 0 0 0 3px rgba(var(--primary-rgb), 0.2);
  --logo-filter: none;
}

/* --- TOKENS MODE SOMBRE (Obsidian Deep Dark) --- */
[data-theme="dark"] {
  --bg-main: #090d16;
  --bg-card: #111827;      
  --bg-input: #1f2937;
  --bg-hero: #030712; 
  
  --border: rgba(255, 255, 255, 0.06);
  
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --text-inverse: var(--white);       
  --text-inverse-muted: var(--gray-400);

  --bg-glass-header: rgba(9, 13, 22, 0.75);
  --border-glass-header: rgba(255, 255, 255, 0.06);

  --gray-50: #111827;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  --logo-filter: invert(1) hue-rotate(180deg);
}

/* --- RESET & BASE --- */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Smooth theme transitions */
body, header, footer, .card, .tool-card, .contact-card, .audience-card, input, select, textarea, .value-list li {
  transition: background-color 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
              border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
              color 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(16px, 5vw, 24px);
}

.text-muted { color: var(--text-muted); }