/* Design System moderne et professionnel v2.0 */
:root {
    --primary-blue: #2563eb;
    --primary-blue-light: #3b82f6;
    --primary-blue-dark: #1d4ed8;
    --primary-purple: #7c3aed;
    --primary-purple-light: #8b5cf6;
    --primary-purple-dark: #6d28d9;
    --accent-gold: #f59e0b;
    --accent-emerald: #10b981;
    --accent-rose: #f43f5e;
    
    --neutral-50: #f8fafc;
    --neutral-100: #f1f5f9;
    --neutral-200: #e2e8f0;
    --neutral-300: #cbd5e1;
    --neutral-400: #94a3b8;
    --neutral-500: #64748b;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1e293b;
    --neutral-900: #0f172a;
    
    --gradient-primary: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    --gradient-warm: linear-gradient(135deg, var(--accent-rose), var(--accent-gold));
    --gradient-cool: linear-gradient(135deg, var(--primary-blue), var(--accent-emerald));
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-2xl: 1.25rem;
    --border-radius-3xl: 1.5rem;
    
    --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;
}

/* Animations fluides et modernes */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(2rem); }
    to { opacity: 1; transform: translateY(0); }
}

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

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-0.5rem); }
}

@keyframes pulse-soft {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Utilitaires de base */
.glass-morphism {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
}

.glass-morphism-dark {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

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

.animate-fade-scale {
    animation: fadeInScale 0.6s ease-out;
}

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

/* Boutons modernes */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    text-decoration: none;
    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: var(--gradient-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: var(--gradient-warm);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-ghost {
    background: transparent;
    color: var(--neutral-600);
    border: 2px solid var(--neutral-200);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-xl);
}

.btn-ghost:hover {
    background: var(--neutral-50);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

/* Cards modernes */
.card {
    background: white;
    border-radius: var(--border-radius-2xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--neutral-200);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card:hover::before {
    transform: scaleX(1);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-blue-light);
}

.card-feature {
    background: linear-gradient(145deg, #ffffff, #f8fafc);
    border: 1px solid var(--neutral-200);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-feature:hover {
    background: linear-gradient(145deg, #f8fafc, #ffffff);
    box-shadow: var(--shadow-2xl);
}

/* Navigation moderne */
.nav-link {
    position: relative;
    color: var(--neutral-700);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-lg);
    transition: all 0.3s ease;
    text-decoration: none;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--primary-blue);
    background: var(--neutral-50);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-link.active {
    color: var(--primary-blue);
    background: var(--primary-blue);
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Logo moderne */
.logo-container {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: all 0.3s ease;
    gap: 0.75rem;
}

.logo-container:hover {
    transform: scale(1.02);
}

.logo-icon {
    width: var(--logo-nav-size, 56px);
    height: var(--logo-nav-size, 56px);
    border-radius: var(--border-radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
}

.logo-icon::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.logo-icon:hover::before {
    opacity: 0.1;
}

.logo-icon img {
    width: calc(var(--logo-nav-size, 48px) - 8px);
    height: calc(var(--logo-nav-size, 48px) - 8px);
    object-fit: contain;
    border-radius: calc(var(--border-radius-2xl) - 4px);
    transition: all 0.3s ease;
}

.logo-icon:hover img {
    transform: scale(1.05);
}

/* Sections modernes */
.section {
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.section-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--neutral-900), var(--neutral-800));
    position: relative;
}

.section-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 80%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
}

/* Headers stylisés */
.heading-display {
    font-size: clamp(3rem, 8vw, 8rem);
    font-weight: 900;
    line-height: 0.9;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, white, var(--neutral-200));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.heading-section {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--neutral-800);
    margin-bottom: 1.5rem;
}

.heading-card {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--neutral-800);
    margin-bottom: 0.75rem;
}

/* Icônes modernes */
.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.icon-sm {
    width: 1rem;
    height: 1rem;
    font-size: 0.75rem;
}

.icon-md {
    width: 1.5rem;
    height: 1.5rem;
    font-size: 1rem;
}

.icon-lg {
    width: 2rem;
    height: 2rem;
    font-size: 1.25rem;
}

.icon-xl {
    width: 3rem;
    height: 3rem;
    font-size: 1.5rem;
}

.icon-2xl {
    width: 4rem;
    height: 4rem;
    font-size: 2rem;
}

.icon-wrapper {
    width: 3rem;
    height: 3rem;
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.icon-wrapper:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-lg);
}

/* Responsive design */
@media (max-width: 1024px) {
    .section {
        padding: 4rem 0;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 3rem 0;
    }
    
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: var(--font-size-sm);
    }
}

@media (max-width: 640px) {
    .logo-icon {
        max-width: 3rem;
        max-height: 3rem;
    }
    
    .logo-icon img {
        max-width: 2.5rem;
        max-height: 2.5rem;
    }
}

/* Utilitaires pour le text */
.text-balance {
    text-wrap: balance;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Focus states accessibles */
.btn:focus-visible,
.nav-link:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}