/* ==========================================================================
   Variables & Reset
   ========================================================================== */
:root {
    /* Couleurs de la marque */
    --clr-royal-blue: #0056b3;
    --clr-cyan-blue: #00a8ff;
    --clr-gray-ind: #f4f4f4;
    --clr-white: #ffffff;
    --clr-dark: #222222;
    --clr-text: #444444;

    /* Typographie */
    --font-main: 'Inter', sans-serif;
    
    /* Espacements et autres */
    --transition-speed: 0.3s;
    --radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-main);
    color: var(--clr-text);
    background-color: var(--clr-gray-ind);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
   Utilitaires
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-speed);
}

ul {
    list-style: none;
}

/* Boutons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--clr-cyan-blue);
    color: var(--clr-white);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--clr-cyan-blue);
    border-color: var(--clr-cyan-blue);
}

.btn-secondary {
    background-color: transparent;
    color: var(--clr-white);
    border-color: var(--clr-white);
}

.btn-secondary:hover {
    background-color: var(--clr-white);
    color: var(--clr-royal-blue);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    background-color: var(--clr-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 110px;
}

.logo a {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 90px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 600;
    color: var(--clr-dark);
    position: relative;
    padding-bottom: 5px;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--clr-cyan-blue);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--clr-cyan-blue);
    transition: width var(--transition-speed);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

/* Burger Menu */
.burger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.burger-menu .bar {
    width: 25px;
    height: 3px;
    background-color: var(--clr-royal-blue);
    transition: all var(--transition-speed);
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.site-main {
    flex: 1;
}

/* Hero Banner */
.hero-banner {
    position: relative;
    background-color: #333; /* Placeholder for image */
    background-image: url('https://images.unsplash.com/photo-1581092160607-ee22621dd758?auto=format&fit=crop&q=80&w=1920'); /* Industrial refrigeration placeholder */
    background-size: cover;
    background-position: center;
    color: var(--clr-white);
    padding: 120px 20px;
    text-align: center;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.65); /* Calque sombre plus prononcé pour lisibilité */
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 25px;
    line-height: 1.2;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.95;
}

/* Services Section */
.services-section {
    padding: 80px 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--clr-royal-blue);
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--clr-cyan-blue);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--clr-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.service-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-bottom: 4px solid var(--clr-cyan-blue);
}

.service-card h3 {
    color: var(--clr-royal-blue);
    margin: 25px 20px 15px;
    font-size: 1.4rem;
}

.service-card p {
    margin: 0 20px 30px;
    color: var(--clr-text);
}

/* About Section */
.about-section {
    padding: 80px 20px;
    text-align: center;
    max-width: 1000px;
}

.about-content h2 {
    font-size: 2.2rem;
    color: var(--clr-royal-blue);
    margin-bottom: 25px;
}

.about-content p {
    font-size: 1.15rem;
    color: var(--clr-text);
    margin-bottom: 20px;
    line-height: 1.8;
}

/* Expertise Section */
.expertise-section {
    background-color: var(--clr-gray-ind);
    padding: 80px 20px;
    border-top: 1px solid #e0e0e0;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.expertise-card {
    background-color: var(--clr-white);
    border-radius: var(--radius);
    border-top: 4px solid var(--clr-royal-blue);
    box-shadow: var(--shadow);
    transition: transform var(--transition-speed), border-color var(--transition-speed);
    overflow: hidden;
}

.expertise-card:hover {
    transform: translateY(-5px);
    border-top-color: var(--clr-cyan-blue);
}

.expertise-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.expertise-card h3 {
    color: var(--clr-royal-blue);
    margin: 20px 25px 15px;
    font-size: 1.4rem;
}

.expertise-card p {
    color: var(--clr-text);
    margin: 0 25px 25px;
    line-height: 1.6;
}

/* ==========================================================================
   Page Headers (Generic)
   ========================================================================== */
.page-header {
    background-color: var(--clr-royal-blue);
    color: var(--clr-white);
    padding: 80px 20px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.page-header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

/* ==========================================================================
   Catalog Section (Fourniture)
   ========================================================================== */
.catalog-section {
    padding: 80px 20px;
}

.catalog-row {
    display: flex;
    align-items: center;
    gap: 50px;
    margin-bottom: 80px;
}

.catalog-row:last-child {
    margin-bottom: 0;
}

.catalog-row.reverse {
    flex-direction: row-reverse;
}

.catalog-image {
    flex: 1;
    min-height: 400px;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.catalog-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.catalog-content {
    flex: 1;
}

.catalog-content h2 {
    font-size: 2.2rem;
    color: var(--clr-royal-blue);
    margin-bottom: 20px;
}

.catalog-content p {
    font-size: 1.1rem;
    color: var(--clr-text);
    margin-bottom: 30px;
    line-height: 1.8;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-section {
    padding: 80px 20px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
}

.contact-info, .contact-form {
    background-color: var(--clr-white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.contact-info h2, .contact-form h2 {
    color: var(--clr-royal-blue);
    margin-bottom: 25px;
    font-size: 2rem;
}

.contact-info > p {
    margin-bottom: 30px;
    color: var(--clr-text);
}

.info-block {
    margin-bottom: 25px;
}

.info-block h3 {
    color: var(--clr-cyan-blue);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.info-block p, .info-block a {
    color: var(--clr-text);
    font-size: 1.1rem;
}

.info-block a:hover {
    color: var(--clr-cyan-blue);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--clr-dark);
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: var(--radius);
    font-family: var(--font-main);
    font-size: 1rem;
    color: var(--clr-text);
    transition: border-color var(--transition-speed);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--clr-cyan-blue);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.btn-whatsapp {
    background-color: #25D366;
    color: var(--clr-white);
    border-color: #25D366;
    flex: 1;
}

.btn-whatsapp:hover {
    background-color: transparent;
    color: #25D366;
    border-color: #25D366;
}

.contact-form .btn-primary {
    flex: 1;
}

/* Floating WhatsApp Button */
.floating-whatsapp {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background-color: #25D366;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.4);
    z-index: 1000;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.floating-whatsapp svg {
    width: 35px;
    height: 35px;
}

.floating-whatsapp:hover {
    transform: scale(1.1);
    background-color: #1ebe57;
    color: white;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background-color: var(--clr-dark);
    color: var(--clr-white);
    padding-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3, .footer-section h4 {
    color: var(--clr-cyan-blue);
    margin-bottom: 20px;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a:hover {
    color: var(--clr-cyan-blue);
}

.footer-bottom {
    background-color: #111;
    text-align: center;
    padding: 20px 0;
    font-size: 0.9rem;
    color: #888;
}

/* ==========================================================================
   Responsive (Mobile)
   ========================================================================== */
@media (max-width: 768px) {
    .burger-menu {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 80px;
        left: -100%;
        width: 100%;
        background-color: var(--clr-white);
        flex-direction: column;
        align-items: center;
        gap: 0;
        box-shadow: 0 10px 10px rgba(0,0,0,0.1);
        transition: left var(--transition-speed) ease-in-out;
    }

    .nav-links.show {
        left: 0;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        display: block;
        padding: 20px;
        border-bottom: 1px solid #eee;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .catalog-row, .catalog-row.reverse {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
    
    .catalog-image {
        width: 100%;
        min-height: 250px;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .hero-banner .btn {
        display: block;
        margin: 10px auto;
        width: 80%;
    }
    
    /* Animation du burger */
    .burger-menu.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .burger-menu.active .bar:nth-child(2) {
        opacity: 0;
    }
    .burger-menu.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .form-actions {
        flex-direction: column;
    }
}