/* ========================================
   FAÇADES LYONNAISE - MAIN STYLESHEET
   Modern CSS Architecture with Design Tokens
   ======================================== */

/* ========================================
   1. DESIGN TOKENS & VARIABLES
   ======================================== */
:root {
    /* Colors - Primary Palette */
    --color-primary-blue: #4A9FD8;
    --color-primary-red: #E57373;
    --color-dark-blue: #2C5F7C;
    --color-darker-blue: #1a3d4f;
    
    /* Colors - Neutrals */
    --color-white: #FFFFFF;
    --color-light-bg: #F8FBFD;
    --color-text-dark: #2C3E50;
    --color-text-light: #6C757D;
    --color-text-muted: #95a5a6;
    
    /* Colors - Shadows */
    --shadow-primary: rgba(74, 159, 216, 0.15);
    --shadow-red: rgba(229, 115, 115, 0.15);
    --shadow-dark: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif;
    
    /* Font Sizes - Fluid Typography */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.375rem);
    --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.75rem);
    --text-2xl: clamp(1.5rem, 1.3rem + 1vw, 2.25rem);
    --text-3xl: clamp(2rem, 1.6rem + 2vw, 3.5rem);
    --text-4xl: clamp(2.5rem, 2rem + 2.5vw, 4rem);
    
    /* Spacing Scale */
    --space-xs: 0.25rem;    /* 4px */
    --space-sm: 0.5rem;     /* 8px */
    --space-md: 1rem;       /* 16px */
    --space-lg: 1.5rem;     /* 24px */
    --space-xl: 2rem;       /* 32px */
    --space-2xl: 3rem;      /* 48px */
    --space-3xl: 4rem;      /* 64px */
    --space-4xl: 6rem;      /* 96px */
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.25rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows - Elevation System */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
}

/* ========================================
   2. RESET & BASE STYLES
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: var(--color-light-bg);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}


/* ========================================
   4. NAVIGATION
   ======================================== */
nav {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.98));
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px var(--shadow-primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(74, 159, 216, 0.1);
    transition: transform var(--transition-base);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-xl);
}

.logo {
    display: flex;
    align-items: center;
    transition: transform var(--transition-base);
}

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

.logo-text {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-primary-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
    align-items: center;
}

.nav-menu a {
    color: var(--color-text-dark);
    font-weight: 500;
    font-size: var(--text-sm);
    transition: all var(--transition-base);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary-blue), var(--color-primary-red));
    transition: width var(--transition-base);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 80%;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary-blue);
}

.cta-nav {
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-dark-blue));
    color: var(--color-white) !important;
    padding: var(--space-sm) var(--space-lg) !important;
    border-radius: var(--radius-full);
    box-shadow: 0 4px 15px var(--shadow-primary);
    font-weight: 600;
}

.cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-primary);
}

.cta-nav::after {
    display: none;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-primary-blue);
    border-radius: 3px;
    transition: var(--transition-base);
}

/* ========================================
   5. HERO SECTION
   ======================================== */
.hero {
    background: linear-gradient(135deg, rgba(74, 159, 216, 0.95), rgba(44, 95, 124, 0.98));
    color: var(--color-white);
    padding: var(--space-4xl) var(--space-xl) var(--space-3xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 50%, rgba(229, 115, 115, 0.2), transparent 60%);
    animation: pulse 8s ease-in-out infinite;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    margin-bottom: var(--space-lg);
    font-weight: 700;
    line-height: 1.2;
    animation: fadeInUp 0.8s ease-out;
}

.hero p {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2xl);
    opacity: 0.95;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* ========================================
   6. BUTTONS
   ======================================== */
.btn {
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--text-base);
    transition: all var(--transition-base);
    display: inline-block;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

.btn-primary {
    background: var(--color-white);
    color: var(--color-primary-blue);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
    background: var(--color-light-bg);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 2px solid var(--color-white);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

/* ========================================
   7. SERVICES SECTION
   ======================================== */
.services {
    padding: var(--space-4xl) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-primary-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.section-header p {
    font-size: var(--text-lg);
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-2xl);
}

.service-card {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: 0 5px 25px var(--shadow-primary);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(74, 159, 216, 0.1);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-blue), var(--color-primary-red));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 45px var(--shadow-primary);
}

.service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-dark-blue));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    font-size: 2rem;
    box-shadow: 0 4px 15px var(--shadow-primary);
    transition: transform var(--transition-base);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

.service-card:nth-child(even) .service-icon {
    background: linear-gradient(135deg, var(--color-primary-red), #D32F2F);
}

.service-card h3 {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    margin-bottom: var(--space-md);
    color: var(--color-text-dark);
    font-weight: 600;
}

.service-card p {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.service-card ul {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.service-card li {
    padding: var(--space-sm) 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: var(--space-lg);
}

.service-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary-blue);
    font-weight: bold;
}

/* ========================================
   8. STATS SECTION
   ======================================== */
.stats {
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-dark-blue));
    color: var(--color-white);
    padding: var(--space-3xl) var(--space-xl);
    margin: var(--space-2xl) 0;
}

.stats-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-2xl);
    text-align: center;
}

.stat-item {
    transition: transform var(--transition-base);
}

.stat-item:hover {
    transform: scale(1.1);
}

.stat-item h3 {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    margin-bottom: var(--space-sm);
    font-weight: 700;
}

.stat-item p {
    font-size: var(--text-base);
    opacity: 0.95;
}

/* Counter Animation */
.stat-number {
    display: inline-block;
}

/* ========================================
   9. ABOUT SECTION
   ======================================== */
.about {
    padding: var(--space-4xl) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.about-text h2 {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-primary-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.about-text p {
    color: var(--color-text-light);
    line-height: 1.9;
    margin-bottom: var(--space-lg);
    font-size: var(--text-base);
}

.about-text ul {
    list-style: none;
    margin: var(--space-lg) 0;
}

.about-text li {
    padding: var(--space-sm) 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: var(--space-xl);
}

.about-text li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary-blue);
    font-weight: bold;
    font-size: 1.3rem;
}

.about-image {
    background: linear-gradient(135deg, rgba(74, 159, 216, 0.1), rgba(229, 115, 115, 0.1));
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: 0 10px 40px var(--shadow-primary);
    text-align: center;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(74, 159, 216, 0.2);
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    transition: transform var(--transition-slow);
}

.about-image:hover img {
    transform: scale(1.05);
}

/* ========================================
   10. CTA SECTION
   ======================================== */
.cta-section {
    background: linear-gradient(135deg, rgba(229, 115, 115, 0.95), rgba(211, 47, 47, 0.95));
    color: var(--color-white);
    padding: var(--space-4xl) var(--space-xl);
    text-align: center;
    margin: var(--space-2xl) 0;
}

.cta-section h2 {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-lg);
    font-weight: 700;
}

.cta-section p {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2xl);
    opacity: 0.95;
}

/* ========================================
   11. FOOTER
   ======================================== */
footer {
    background: linear-gradient(135deg, var(--color-text-dark), #1a252f);
    color: var(--color-white);
    padding: var(--space-3xl) var(--space-xl) var(--space-xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-section h3 {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    margin-bottom: var(--space-lg);
    color: var(--color-primary-blue);
    font-weight: 600;
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    line-height: 2;
    display: block;
    transition: all var(--transition-base);
}

.footer-section a:hover {
    color: var(--color-primary-blue);
    padding-left: 5px;
}

.certifications {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
    margin-top: var(--space-md);
}

.cert-badge {
    background: var(--color-white);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    flex: 1;
    min-width: 150px;
    border: 2px solid rgba(74, 159, 216, 0.3);
    transition: transform var(--transition-base);
}

.cert-badge:hover {
    transform: translateY(-5px);
}

.cert-badge img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a {
    color: var(--color-primary-blue);
    margin: 0 var(--space-md);
    transition: color var(--transition-base);
}

.footer-bottom a:hover {
    color: var(--color-primary-red);
}

/* ========================================
   12. RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--space-xl);
        box-shadow: 0 5px 20px var(--shadow-primary);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }

    .nav-menu.active {
        max-height: 500px;
    }

    .hero h1 {
        font-size: var(--text-2xl);
    }

    .hero p {
        font-size: var(--text-base);
    }

    .hero-buttons {
        flex-direction: column;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        padding: var(--space-md);
    }
}

/* ========================================
   13. UTILITY CLASSES
   ======================================== */
.text-center { text-align: center; }
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary-blue), var(--color-primary-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Loading State */
.loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

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

/* Focus Styles */
*:focus-visible {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}