/* ===== VARIABLES CSS 2025 ===== */
:root {
    /* Couleurs principales - Palette moderne 2025 */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #f59e0b;
    --secondary-dark: #d97706;
    --secondary-light: #fbbf24;
    
    /* Couleurs d'accent modernes */
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    
    /* Couleurs d'état */
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;
    
    /* Couleurs neutres 2025 */
    --text-dark: #0f172a;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --background-light: #ffffff;
    --background-gray: #f8fafc;
    --background-dark: #0f172a;
    --border-color: #e2e8f0;
    --border-color-light: #f1f5f9;
    --shadow: rgba(0, 0, 0, 0.04);
    --shadow-lg: rgba(0, 0, 0, 0.08);
    --shadow-xl: rgba(0, 0, 0, 0.12);
    
    /* RGB versions for alpha usage */
    --primary-color-rgb: 99, 102, 241;
    
    /* Gradients modernes */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #f59e0b 0%, #f97316 50%, #ef4444 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    
    /* Typographie moderne */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Tailles de police */
    --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;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Espacement moderne */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    --spacing-5xl: 8rem;
    
    /* Bordures modernes */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-2xl: 1.5rem;
    --border-radius-full: 9999px;
    
    /* Transitions fluides 2025 */
    --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);
    
    /* Largeurs */
    --container-max-width: 1200px;
    --content-max-width: 800px;
    
    /* Effets modernes */
    --blur-sm: blur(4px);
    --blur-md: blur(8px);
    --blur-lg: blur(16px);
    --blur-xl: blur(24px);
}

/* ===== RESET & BASE MODERNES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: 120px;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
}

a:hover {
    color: var(--primary-dark);
}

/* ===== UTILITAIRES ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== TYPOGRAPHIE MODERNE ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
    letter-spacing: -0.025em;
}

h1 { font-size: var(--font-size-5xl); font-weight: 800; }
h2 { font-size: var(--font-size-4xl); font-weight: 700; }
h3 { font-size: var(--font-size-3xl); font-weight: 600; }
h4 { font-size: var(--font-size-2xl); font-weight: 600; }
h5 { font-size: var(--font-size-xl); font-weight: 600; }
h6 { font-size: var(--font-size-lg); font-weight: 600; }

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.section__title {
    text-align: center;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xl);
    position: relative;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: -var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-full);
}

.section__subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-1xl);
    max-width: var(--content-max-width);
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
    line-height: 1.6;
}

/* ===== ANIMATIONS DE BASE ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
    animation: slideInLeft 0.8s ease-out;
}

.animate-slide-in-right {
    animation: slideInRight 0.8s ease-out;
}

.animate-scale-in {
    animation: scaleIn 0.6s ease-out;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* ===== ACCESSIBILITÉ ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* ===== FOCUS STYLES ===== */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== SCROLLBAR PERSONNALISÉE ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--border-radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}