/* ===== VARIABLES & RESET ===== */
:root {
    /* Couleurs principales */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #8b5cf6;
    --secondary: #f59e0b;
    --accent: #10b981;
    
    /* Couleurs neutres */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Sémantiques */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Typographie */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Espacements */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Bordures */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  /* Mode sombre */
  [data-theme="dark"] {
    --bg-primary: var(--gray-900);
    --bg-secondary: var(--gray-800);
    --bg-card: var(--gray-800);
    --text-primary: var(--white);
    --text-secondary: var(--gray-300);
    --text-muted: var(--gray-400);
    --border: var(--gray-700);
  }
  
  /* Mode clair */
  :root {
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-card: var(--white);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-700);
    --text-muted: var(--gray-600);
    --border: var(--gray-200);
  }
  
  /* ===== RESET & BASE STYLES ===== */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition-slow);
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
  }
  
  /* ===== TYPOGRAPHY ===== */
  h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
  }
  
  h1 {
    font-size: var(--font-size-4xl);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  
  h2 {
    font-size: var(--font-size-3xl);
  }
  
  h3 {
    font-size: var(--font-size-2xl);
  }
  
  p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
  }
  
  /* ===== BUTTONS ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }
  
  .btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
  }
  
  .btn:hover::before {
    left: 100%;
  }
  
  .btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    box-shadow: var(--shadow-lg);
  }
  
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
  }
  
  .btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
  }
  
  .btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
  }
  
  .btn-light {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-lg);
  }
  
  .btn-light:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
  }
  
  .btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
  }
  
  .btn-theme {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: var(--space-2) var(--space-4);
  }
  
  /* ===== HEADER ===== */
  .main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
  }
  
  [data-theme="dark"] .main-header {
    background: rgba(15, 23, 42, 0.95);
  }
  
  .header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
  }
  
  .logo a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    transition: var(--transition);
  }
  
  .logo i {
    color: var(--primary);
    font-size: var(--font-size-2xl);
  }
  
  .main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-8);
  }
  
  .main-nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }
  
  .main-nav a:hover,
  .main-nav a.active {
    color: var(--primary);
  }
  
  .main-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
  }
  
  .main-nav a:hover::after,
  .main-nav a.active::after {
    width: 100%;
  }
  
  .mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    cursor: pointer;
  }
  
  /* ===== HERO SECTION ===== */
  .hero {
    position: relative;
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    overflow: hidden;
  }
  
  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
      radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
      radial-gradient(circle at 80% 20%, rgba(245, 158, 11, 0.1) 0%, transparent 50%);
  }
  
  .hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    position: relative;
    z-index: 2;
  }
  
  .hero-content {
    position: relative;
    z-index: 2;
    margin-top: -81px;
  }
  .hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: var(--space-6);
    animation: fadeInUp 1s ease-out;
  }
  
  .hero-content p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-8);
    color: var(--text-secondary);
    animation: fadeInUp 1s ease-out 0.2s both;
  }
  
  .hero-cta {
    display: flex;
    gap: var(--space-4);
    animation: fadeInUp 1s ease-out 0.4s both;
  }
  .hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px; /* optionnel */
    margin-top: -120px; /* décale vers le haut */
  }
  
  .hero-image img {
    max-width: 73%;
    height: auto;
    display: block;
  }
    
  .hero-image::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    opacity: 0.1;
    border-radius: 50%;
    z-index: -1;
  }
  
  

  /* ===== SECTIONS ===== */
  .section {
    padding: var(--space-16) 0;
  }
  
  .section-header {
    text-align: center;
    margin-bottom: var(--space-12);
  }
  
  .section-header h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-4);
  }
  
  .section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-muted);
  }
  
  /* ===== GENERATOR SECTION ===== */
  .generator-section {
    background: var(--bg-secondary);
  }
  
  .generator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: start;
  }
  
  .generator-form {
    background: var(--bg-card);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
  }
  
  .qr-preview-container {
    position: sticky;
    top: 100px;
  }
  
  .qr-preview-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    overflow: hidden;
    animation: slideInRight 0.6s ease-out;
  }
  
  .qr-preview-header {
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    text-align: center;
  }
  
  .qr-preview-content {
    padding: var(--space-8);
    text-align: center;
  }
  
  .qr-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    animation: zoomIn 0.6s ease-out;
  }
  
  .qr-placeholder {
    padding: var(--space-12);
    color: var(--text-muted);
  }
  
  .qr-placeholder i {
    font-size: 4rem;
    color: var(--gray-300);
    margin-bottom: var(--space-4);
    display: block;
  }
  
  .qr-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    margin-top: var(--space-6);
    flex-wrap: wrap;
  }
  
  .qr-tips {
    margin-top: var(--space-6);
    padding: var(--space-6);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
  }
  
  .qr-tips h4 {
    margin-bottom: var(--space-4);
  }
  
  .qr-tips ul {
    list-style: none;
  }
  
  .qr-tips li {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
  }
  
  .qr-tips i {
    color: var(--success);
  }
  
  /* ===== FEATURES SECTION ===== */
  .features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
  }
  
  .feature-card {
    background: var(--bg-card);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }
  
  .feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.05), transparent);
    transition: left 0.6s;
  }
  
  .feature-card:hover::before {
    left: 100%;
  }
  
  .feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
  }
  
  .feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--white);
  }
  
  .feature-card h3 {
    margin-bottom: var(--space-4);
  }
  
  .feature-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    margin-top: var(--space-4);
    transition: var(--transition);
  }
  
  .feature-link:hover {
    gap: var(--space-3);
  }
  
  /* ===== HOW IT WORKS ===== */
  .how-it-works {
    background: var(--bg-secondary);
  }
  
  .steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
  }
  
  .step {
    text-align: center;
    padding: var(--space-8);
    position: relative;
  }
  
  .step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0 auto var(--space-6);
    position: relative;
    z-index: 2;
  }
  
  .step::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 50%;
    right: 50%;
    height: 2px;
    background: var(--primary);
    opacity: 0.3;
    z-index: 1;
  }
  
  .step:first-child::before {
    display: none;
  }
  
  /* ===== CTA SECTION ===== */
  .cta-section {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    text-align: center;
    padding: var(--space-16) 0;
  }
  
  .cta-content h2 {
    color: var(--white);
    margin-bottom: var(--space-4);
  }
  
  .cta-content p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-8);
    font-size: var(--font-size-lg);
  }
  
  /* ===== FOOTER ===== */
  .main-footer {
    background: var(--gray-900);
    color: var(--white);
    padding: var(--space-16) 0 var(--space-8);
  }
  
  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
  }
  
  .footer-about .logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-xl);
    font-weight: 700;
  }
  
  .footer-about p {
    color: var(--gray-400);
    margin-bottom: var(--space-6);
  }
  
  .social-links {
    display: flex;
    gap: var(--space-4);
  }
  
  .social-links a {
    width: 40px;
    height: 40px;
    background: var(--gray-700);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
  }
  
  .social-links a:hover {
    background: var(--primary);
    transform: translateY(-2px);
  }
  
  .footer-links h4 {
    color: var(--white);
    margin-bottom: var(--space-6);
  }
  
  .footer-links ul {
    list-style: none;
  }
  
  .footer-links li {
    margin-bottom: var(--space-3);
  }
  
  .footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
  }
  
  .footer-links a:hover {
    color: var(--white);
    padding-left: var(--space-2);
  }
  
  .newsletter-form {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-4);
  }
  
  .newsletter-form input {
    flex: 1;
    padding: var(--space-3);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius);
    background: var(--gray-800);
    color: var(--white);
  }
  
  .footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--gray-700);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
  }
  
  .legal-links {
    display: flex;
    gap: var(--space-6);
  }
  
  .legal-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
  }
  
  .legal-links a:hover {
    color: var(--white);
  }
  
  /* ===== BACK TO TOP ===== */
  .back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }
  
  .back-to-top.visible {
    opacity: 1;
    visibility: visible;
  }
  
  .back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
  }
  
  /* ===== ANIMATIONS ===== */
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  @keyframes slideInRight {
    from {
      opacity: 0;
      transform: translateX(30px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }
  
  @keyframes zoomIn {
    from {
      opacity: 0;
      transform: scale(0.8);
    }
    to {
      opacity: 1;
      transform: scale(1);
    }
  }
  
  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-20px);
    }
  }
  
  /* ===== RESPONSIVE DESIGN ===== */
  @media (max-width: 1024px) {
    .hero .container {
      grid-template-columns: 1fr;
      text-align: center;
    }
    
    .footer-grid {
      grid-template-columns: 1fr 1fr;
      gap: var(--space-8);
    }
  }
  
  @media (max-width: 768px) {
    .main-nav {
      display: none;
    }
    
    .mobile-menu-toggle {
      display: block;
    }
    
    .header-actions {
      display: none;
    }
    
    .generator-container {
      grid-template-columns: 1fr;
    }
    
    .hero-cta {
      flex-direction: column;
      align-items: center;
    }
    
    .footer-grid {
      grid-template-columns: 1fr;
    }
    
    .footer-bottom {
      flex-direction: column;
      text-align: center;
    }
    
    .newsletter-form {
      flex-direction: column;
    }
  }
  
  @media (max-width: 640px) {
    .container {
      padding: 0 var(--space-4);
    }
    
    h1 {
      font-size: 2.5rem;
    }
    
    .hero {
      padding: 120px 0 80px;
    }
    
    .section {
      padding: var(--space-12) 0;
    }
  }
  
  /* ===== FORM STYLES ===== */
  .form-row {
    margin-bottom: var(--space-6);
  }
  
  .form-row label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 600;
    color: var(--text-primary);
  }
  
  .form-row input,
  .form-row select,
  .form-row textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: var(--transition);
  }
  
  .form-row input:focus,
  .form-row select:focus,
  .form-row textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
  }
  
  .colors {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
  }
  
  .color-option {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
  }
  
  .swatch {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 3px solid var(--border);
    transition: var(--transition);
  }
  
  .color-option input:checked + .swatch {
    border-color: var(--primary);
    transform: scale(1.1);
  }
  
  .type-block {
    display: none;
    animation: fadeInUp 0.5s ease-out;
  }
  
  .type-block.active {
    display: block;
  }
  
  /* ===== NOTIFICATIONS ===== */
  .notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    color: var(--white);
    font-weight: 600;
    box-shadow: var(--shadow-xl);
    z-index: 10000;
    opacity: 0;
    transform: translateX(100%);
    transition: var(--transition);
    max-width: 320px;
    backdrop-filter: blur(10px);
  }
  
  .notification.show {
    opacity: 1;
    transform: translateX(0);
  }
  
  .notification.success {
    background: linear-gradient(135deg, var(--success), #059669);
  }
  
  .notification.error {
    background: linear-gradient(135deg, var(--error), #dc2626);
  }
  
  .notification.warning {
    background: linear-gradient(135deg, var(--warning), #d97706);
  }
  
  .notification.info {
    background: linear-gradient(135deg, var(--info), #2563eb);
  }