/*1. VARIABLES ET STYLES DE BASE*/

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --background-color: #ecf0f1;
    --text-color: #34495e;
    --light-color: #ffffff;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

/*2. HEADER DE LA PAGE PROJET*/

.project-header {
    background-color: var(--light-color);
    padding: 1rem 2rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.project-header nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-header h1 {
    font-size: 1.8rem;
    color: var(--secondary-color);
}

.back-button {
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 0.7rem 1.2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 700;
    transition: background-color 0.3s ease;
}

.back-button:hover {
    background-color: #2980b9;
}

.back-button i {
    margin-right: 8px;
}

/*3. CONTENU DU PROJET*/

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.project-intro {
    text-align: center;
    padding: 2rem 0;
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 2rem auto;
}

.gallery-container h2 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
    display: inline-block;
}

.gallery-container h2 i {
    margin-right: 10px;
}

/*4. GRILLE D'IMAGES*/

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.gallery-item {
    background-color: var(--light-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

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

/*5. FOOTER*/

footer {
    background-color: var(--secondary-color);
    color: var(--light-color);
    text-align: center;
    padding: 1.5rem;
    margin-top: 4rem;
}

/*6. RESPONSIVE*/

@media (max-width: 768px) {
    .project-header nav {
        flex-direction: column;
        gap: 1rem;
    }

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