:root {
    --primary: #0a3d62;
    --accent: #0c1f61;
    --bg: #f5f6fa;
    --white: #ffffff;
    --text: #2f3640;
    --muted: #636e72;
    --radius: 10px;
    /* Smooth ease-in-out transition for all animated elements */
    --transition: 0.4s ease-in-out;
    --shadow: rgba(0, 0, 0, 0.1);
    --tooltip-bg: rgba(0, 0, 0, 0.8);
    --tooltip-color: #ffffff;
}

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

.container {
    max-width: 1200px;
    margin: 1rem auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media(max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
}

/* —— Gallery —— */
.gallery {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    height: 35rem;
    width: 40rem;
}

.main-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    box-shadow: 0 4px 20px var(--shadow);
    aspect-ratio: 2 / 3;
    padding-bottom: 75%;
    height: 100%;
    width: 100%;
    background: var(--white);
}

.main-image > img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.main-image .main-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 2px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition), transform var(--transition);
    z-index: 10;
}

.main-image > img.visible,
.main-image .main-grid.visible {
    opacity: 1;
    transform: none;
}

.main-image .main-grid img {
    position: static;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius);
}

.thumbnails {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-direction: column;
}

.thumbnails img,
.thumbnails .grid-display {
    width: 4rem;
    height: 4rem;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition), transform var(--transition), border-color var(--transition);
    background: var(--white);
}

.thumbnails img.active,
.thumbnails .grid-display.active,
.thumbnails img:hover,
.thumbnails .grid-display:hover {
    opacity: 1;
    transform: translateY(-3px);
    border-color: var(--accent);
}

.grid-display {
    display: grid;
    grid-template: 1fr 1fr / 1fr 1fr;
    width: 100%;
    height: 100%;
}

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

/* —— Details —— */
.details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.details h1 {
    font-size: 2.5rem;
    color: var(--primary);
}

.sku {
    font-size: 0.9rem;
    color: var(--muted);
}

.price {
    font-size: 2rem;
    font-weight: 600;
    color: var(--accent);
}

.buy-btn {
    background: var(--accent);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    text-align: center;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.buy-btn:hover {
    color: whitesmoke;
    background: var(--muted);
}

.description {
    padding: 1rem;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px var(--shadow);
    color: var(--muted);
}

.notes {
    text-align: center;
    max-width: 1200px;
    margin: 1rem auto;
    padding: 1rem;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px var(--shadow);
    color: var(--muted);
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.tab {
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-weight: 100;
    border-bottom: 3px solid transparent;
    transition: border-color var(--transition), color var(--transition);
}

.tab.active {
    color: var(--accent);
    border-color: var(--accent);
}

.spec-content {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px var(--shadow);
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.spec-item {
    position: relative;
    text-align: center;
}

/* Spec label */
.spec-item strong {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 600;
    color: var(--muted);
}

/* Spec value container with ellipsis */
.spec-item span {
    display: block;
    max-width: 120px;       /* adjust width as needed */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0 auto;
    cursor: default;
}

/* Tooltip styling */
.spec-item span::after {
    content: attr(data-full);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--tooltip-bg);
    color: var(--tooltip-color);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius);
    white-space: normal;
    width: max-content;
    max-width: 200px;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition);
    pointer-events: none;
    z-index: 10;
}

.spec-item span::before {
    content: '';
    position: absolute;
    bottom: 115%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--tooltip-bg);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition);
    pointer-events: none;
    z-index: 10;
}

/* Show tooltip on hover (desktop) */
.spec-item:hover span::after,
.spec-item:hover span::before {
    opacity: 1;
    visibility: visible;
}

/* Show tooltip on tap (mobile) */
@media (max-width: 768px) {
    .spec-item:active span::after,
    .spec-item:active span::before {
        opacity: 1;
        visibility: visible;
    }
}

@media(max-width: 768px) {
    .gallery {
        flex-direction: column-reverse;
        height: auto;
        width: 100%;
    }

    .main-image {
        height: 30rem;
        width: 100%;
    }

    .container {
        margin: 1rem;
    }

    .details h1 {
        font-size: 2rem;
    }

    .price {
        font-size: 1.5rem;
    }

    .thumbnails {
        flex-direction: row;
    }

    .notes {
        max-width: 600px;
        margin: 1rem;
        padding: 1rem;
    }
}