:root {
    --primary-color: #ffffff;
    --secondary-color: #d4af37; /* Or pour le contraste */
    --bg-color: transparent; 
    --bg-alt: rgba(0, 0, 0, 0.4); /* Fond semi-transparent pour les sections */
    --text-main: #f5f5f5;
    --text-muted: #cccccc;
    --border-color: rgba(255, 255, 255, 0.2);
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Outfit', sans-serif;
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: var(--font-body);
    background-image: linear-gradient(rgba(0,0,0,0.65), rgba(0,0,0,0.85)), url('img/matterhorn.svg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-color: #1a1a1a;
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    font-weight: 400;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(15px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-decoration: none;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 300;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 2px;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

.lang-selector {
    display: flex;
    gap: 0.8rem;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.lang-btn.active, .lang-btn:hover {
    color: var(--primary-color);
    font-weight: 600;
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 1s ease forwards;
}

.animate-slide-up {
    animation: slideUp 1s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

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

@keyframes slideUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Scroll Reveal */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    transform: scale(1.05); /* Slight zoom for parallax feel */
}

.hero-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: transparent;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
    padding: 2rem;
}

.hero h1 {
    font-size: 5vw; /* Responsive huge text */
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero .subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-weight: 300;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.btn-primary {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 1.2rem 3rem;
    text-decoration: none;
    font-family: var(--font-body);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    border: 1px solid var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: white;
    color: #000;
}

/* Sections */
section {
    padding: 8rem 5%;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.section-title {
    font-size: 3rem;
}

.link-arrow {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 400;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: var(--transition);
}

.link-arrow:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

/* Grid & Cards */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 3rem;
}

.art-card {
    text-decoration: none;
    color: var(--text-main);
    display: block;
    group: card;
}

.art-image-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
    margin-bottom: 1.5rem;
    background-color: var(--border-color); /* Loading state color */
}

.art-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* The "Alive" effect */
.art-card:hover .art-image-wrapper img {
    transform: scale(1.08);
}

.art-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.art-title {
    font-size: 1.2rem;
    font-family: var(--font-body);
    font-weight: 400;
}

.art-price {
    color: var(--secondary-color);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-style: italic;
}

/* About Section */
.about-section {
    background-color: var(--bg-alt);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.about-divider {
    width: 80px;
    height: 1px;
    background-color: var(--secondary-color);
    margin: 2rem 0;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 300;
}

.about-image-wrapper {
    position: relative;
}

.about-image-wrapper::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    width: 100%;
    height: 100%;
    border: 1px solid var(--secondary-color);
    z-index: 0;
}

.about-img {
    width: 100%;
    position: relative;
    z-index: 1;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

/* Detail Page specific */
.page-header {
    padding-top: 10rem;
    padding-bottom: 4rem;
    text-align: center;
}

.artwork-detail-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5% 8rem 5%;
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
}

.artwork-large-image img {
    width: 100%;
    box-shadow: 0 30px 60px rgba(0,0,0,0.1);
}

.artwork-meta {
    position: sticky;
    top: 120px;
}

.meta-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.meta-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-weight: 300;
}

.meta-specs {
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-bottom: 3rem;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

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

.spec-label {
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

.spec-value {
    font-weight: 400;
}

.meta-price {
    font-size: 2rem;
    font-family: var(--font-heading);
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

.btn-full {
    width: 100%;
    text-align: center;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(250, 249, 246, 0.98);
}

.modal-content {
    margin: 5% auto;
    width: 90%;
    max-width: 500px;
    background: #1a1a1a;
    padding: 4rem;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    position: relative;
    animation: slideUp 0.5s ease forwards;
    border: 1px solid var(--border-color);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
}

.modal h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    font-family: var(--font-body);
    background: var(--bg-color);
    transition: var(--transition);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 4rem 5%;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

footer .logo {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 3rem; }
    .about-grid, .artwork-detail-container { grid-template-columns: 1fr; gap: 3rem; }
    .artwork-meta { position: static; }
    .modal-content { padding: 2rem; width: 95%; margin: 10% auto; }
}