/* 
  Theme: Precision Optic
  Colors: Matte Carbon Black, Crimson Red, Pearl Gray, Crisp White
  No greens. No Tailwind. Pure Vanilla CSS.
*/
:root {
    --color-bg: #f8f9fa; /* Pearl Gray */
    --color-card: #ffffff;
    --color-text: #212529; /* Dark Gray / Black */
    --color-muted: #6c757d;
    --color-crimson: #dc143c; /* Crimson Red */
    --color-crimson-dark: #b01030;
    --color-carbon: #111111;
    --color-border: #dee2e6;
    
    --font-head: 'Oswald', sans-serif;
    --font-body: 'Roboto', sans-serif;
}

/* Reset de base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* En-tête */
.optic-header {
    background-color: var(--color-carbon);
    padding: 25px 0;
    text-align: center;
    border-bottom: 5px solid var(--color-crimson);
}

.logo-title {
    font-family: var(--font-head);
    font-size: 2.2rem;
    color: var(--color-card);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Grille Produit */
.product-grid {
    display: flex;
    gap: 45px;
    background-color: var(--color-card);
    padding: 40px;
    margin-top: 40px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.gallery-wrapper {
    width: 45%;
}

.product-info {
    width: 55%;
}

/* Logique de la Galerie CSS pure */
.gallery-wrapper input[type="radio"] {
    display: none;
}

.main-display {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 20px;
    background-color: var(--color-card);
}

.slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Activation de la slide correspondante */
#img1:checked ~ .main-display #slide1,
#img2:checked ~ .main-display #slide2,
#img3:checked ~ .main-display #slide3,
#img4:checked ~ .main-display #slide4 {
    opacity: 1;
    pointer-events: auto;
    z-index: 10;
}

/* Flèches de navigation */
.arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background-color: var(--color-carbon);
    color: var(--color-card);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 2px;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
    z-index: 20;
    user-select: none;
}

.main-display:hover .arrow {
    opacity: 1;
}

.arrow:hover {
    background-color: var(--color-crimson);
}

.left-arrow { left: 15px; }
.right-arrow { right: 15px; }

/* Miniatures */
.thumbnail-row {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    overflow-x: auto;
    padding-bottom: 5px;
}

.thumbnail-row::-webkit-scrollbar { display: none; }
.thumbnail-row { scrollbar-width: none; }

.thumb {
    flex: 0 0 80px;
    height: 80px;
    border: 2px solid transparent;
    border-radius: 4px;
    background-color: var(--color-card);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0.6;
    transition: all 0.2s ease;
    border: 1px solid var(--color-border);
}

.thumb img {
    max-width: 85%;
    max-height: 85%;
    object-fit: contain;
}

.thumb:hover {
    opacity: 1;
}

/* Highlight Miniature Active */
#img1:checked ~ .thumbnail-row .thumb[for="img1"],
#img2:checked ~ .thumbnail-row .thumb[for="img2"],
#img3:checked ~ .thumbnail-row .thumb[for="img3"],
#img4:checked ~ .thumbnail-row .thumb[for="img4"] {
    border-color: var(--color-crimson);
    opacity: 1;
}

/* Détails du Produit */
.product-name {
    font-family: var(--font-head);
    font-size: 2rem;
    color: var(--color-carbon);
    margin-bottom: 25px;
    line-height: 1.2;
    text-transform: uppercase;
}

.product-specs h3 {
    font-family: var(--font-head);
    font-size: 1.3rem;
    color: var(--color-crimson);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 10px;
    text-transform: uppercase;
}

.specs-list {
    list-style: none;
    margin-bottom: 25px;
}

.specs-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 15px;
    color: var(--color-muted);
    font-size: 0.95rem;
}

.specs-list li::before {
    content: "■";
    position: absolute;
    left: 0;
    top: 2px;
    color: var(--color-crimson);
    font-size: 0.7rem;
}

.specs-list li strong {
    color: var(--color-text);
}

.health-seo-block {
    background-color: var(--color-bg);
    padding: 15px 20px;
    border-left: 4px solid var(--color-crimson);
    font-size: 0.95rem;
    color: var(--color-muted);
    font-style: italic;
    border-radius: 0 4px 4px 0;
}

/* Bouton d'Achat (CTA) */
.action-center {
    text-align: center;
    margin: 60px 0;
}

.btn-crimson {
    display: inline-block;
    background-color: var(--color-crimson);
    color: var(--color-card);
    font-family: var(--font-head);
    font-size: 1.4rem;
    font-weight: 700;
    text-transform: uppercase;
    text-decoration: none;
    padding: 18px 60px;
    border-radius: 4px;
    letter-spacing: 1px;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 6px 15px rgba(220, 20, 60, 0.3);
}

.btn-crimson:hover {
    background-color: var(--color-crimson-dark);
    transform: translateY(-3px);
}

/* Avis Clients */
.reviews-module {
    background-color: var(--color-card);
    padding: 40px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 60px;
}

.reviews-title {
    font-family: var(--font-head);
    font-size: 1.8rem;
    color: var(--color-carbon);
    margin-bottom: 35px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 10px;
}

.reviews-list {
    display: flex;
    flex-direction: column;
    gap: 35px;
}

.review-item {
    display: flex;
    gap: 25px;
    padding-bottom: 35px;
    border-bottom: 1px dashed var(--color-border);
}

.review-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
    margin-bottom: 0;
}

.r-avatar img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-bg);
}

.r-details {
    flex: 1;
}

.r-name {
    font-family: var(--font-head);
    font-size: 1.15rem;
    color: var(--color-carbon);
    margin-bottom: 4px;
}

.r-rating-line {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
}

.r-stars {
    color: #eab308; /* Amber Yellow */
    font-size: 1.1rem;
    letter-spacing: 1px;
}

.r-headline {
    font-weight: 700;
    color: var(--color-text);
}

.r-badge {
    font-size: 0.85rem;
    color: var(--color-crimson);
    margin-bottom: 12px;
    font-weight: 700;
    text-transform: uppercase;
}

.r-text {
    color: var(--color-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 15px;
}

.r-photos {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.r-photos img {
    width: 90px;
    height: 90px;
    object-fit: cover;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    transition: opacity 0.2s ease;
}

.r-photos img:hover {
    opacity: 0.8;
    cursor: pointer;
}

/* Pied de page */
.optic-footer {
    background-color: var(--color-carbon);
    color: #adb5bd;
    padding: 50px 0;
    text-align: center;
}

.optic-footer h3 {
    font-family: var(--font-head);
    color: var(--color-card);
    font-size: 1.3rem;
    margin-bottom: 25px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: #adb5bd;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-crimson);
}

.f-sep {
    margin: 0 15px;
    color: #495057;
}

.copyright-txt {
    font-size: 0.85rem;
}

/* Responsive Media Queries */
@media screen and (max-width: 900px) {
    .product-grid {
        flex-direction: column;
        padding: 25px;
    }
    
    .gallery-wrapper, .product-info {
        width: 100%;
    }

    .product-name {
        font-size: 1.7rem;
    }
}

@media screen and (max-width: 600px) {
    .review-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .arrow {
        opacity: 0.9;
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }

    .btn-crimson {
        width: 100%;
        padding: 16px 20px;
        font-size: 1.2rem;
    }

    .footer-links a {
        display: block;
        margin: 12px 0;
    }

    .f-sep {
        display: none;
    }
}