.product-detail {
    background:
        radial-gradient(circle at 10% 0%, #3e1d10 0%, transparent 28%),
        radial-gradient(circle at 92% 15%, #65311f 0%, transparent 24%),
        linear-gradient(180deg, #120f0e 0%, #191210 22%, var(--bg-100) 22.1%, var(--bg-100) 100%);
}

.back-link {
    display: inline-block;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 2rem;
    transition: color 0.22s ease, transform 0.22s ease;
    position: relative;
}

.back-link::before {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.back-link:hover,
.back-link:focus-visible {
    color: var(--accent-deep);
}

.back-link:hover::before,
.back-link:focus-visible::before {
    width: 100%;
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
    align-items: start;
}

.product-image {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(17, 16, 16, 0.95) 0%, rgba(28, 23, 21, 0.92) 100%);
    border: 2px solid rgba(218, 165, 32, 0.3);
    border-radius: 1.2rem;
    padding: 2rem;
    min-height: 400px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(218, 165, 32, 0.1);
}

.product-image img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
}

.product-info h1 {
    font-size: clamp(1.8rem, 5vw, 2.4rem);
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: #ffffff;
    letter-spacing: -0.01em;
}

.category-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(218, 165, 32, 0.2) 0%, rgba(184, 134, 11, 0.15) 100%);
    color: var(--accent);
    padding: 0.45rem 0.85rem;
    border: 1px solid rgba(218, 165, 32, 0.4);
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.price-large {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 2rem;
}

.product-description,
.product-highlights,
.nutrition-info {
    margin-bottom: 2rem;
}

.product-description h2,
.product-highlights h2,
.nutrition-info h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #999999;
}

.product-description p {
    color: #888888;
    line-height: 1.8;
}

.product-highlights ul {
    list-style: none;
    display: grid;
    gap: 0.75rem;
}

.product-highlights li {
    display: flex;
    align-items: center;
    color: #888888;
}

.product-highlights li:before {
    content: "✓";
    color: var(--accent);
    font-weight: 800;
    margin-right: 0.75rem;
}

.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    background: linear-gradient(135deg, rgba(17, 16, 16, 0.95) 0%, rgba(28, 23, 21, 0.92) 100%);
    border: 1px solid rgba(218, 165, 32, 0.2);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: inset 0 1px 0 rgba(218, 165, 32, 0.1);
}

.nutrition-grid div {
    text-align: center;
}

.nutrition-grid strong {
    display: block;
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.nutrition-grid p {
    font-size: 1.5rem;
    font-weight: 800;
    color: #888888;
}

.authenticity-section {
    background: linear-gradient(180deg, rgba(17, 16, 16, 0.98) 0%, rgba(28, 23, 21, 0.95) 100%);
    border: 2px solid rgba(218, 165, 32, 0.4);
    border-radius: 1.2rem;
    padding: 2.5rem;
    margin-top: 4rem;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(218, 165, 32, 0.2);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.authenticity-content {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.authenticity-section h2 {
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 0.75rem;
    text-align: left;
}

.authenticity-section > p {
    color: #888888;
    margin-bottom: 1.75rem;
    line-height: 1.7;
    text-align: left;
}

.authenticity-graphic {
    display: none;
}

.form-group {
    display: grid;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: #ffffff;
    font-size: 0.95rem;
}

.form-group input {
    border: 2px solid rgba(218, 165, 32, 0.3);
    border-radius: 0.65rem;
    padding: 0.75rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    background: rgba(0, 0, 0, 0.3);
    color: #ffffff;
    transition: border-color 0.22s ease, background 0.22s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 12px rgba(218, 165, 32, 0.2);
}

.form-group input::placeholder {
    color: #888888;
}

.verify-btn {
    border: 0;
    border-radius: 0.65rem;
    background: var(--accent);
    color: #1f1b19;
    padding: 0.85rem 1.2rem;
    font-weight: 800;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.22s ease, transform 0.22s ease;
    align-self: start;
}

.verify-btn:hover,
.verify-btn:focus-visible {
    background: var(--accent-deep);
    transform: translateY(-2px);
}

.verification-result {
    min-height: 1.5rem;
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-weight: 600;
    display: none;
}

.verification-result.success {
    display: block;
    background: rgba(47, 110, 47, 0.2);
    color: #4ade80;
    border: 1px solid rgba(47, 110, 47, 0.4);
}

.verification-result.error {
    display: block;
    background: rgba(155, 47, 26, 0.2);
    color: #ff6b6b;
    border: 1px solid rgba(155, 47, 26, 0.4);
}

@media (max-width: 768px) {
    .product-detail-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .product-image {
        min-height: 320px;
    }

    .product-info h1 {
        font-size: 1.6rem;
        color: #1f1b19;
    }

    .price-large {
        font-size: 1.5rem;
    }

    .nutrition-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .authenticity-section {
        grid-template-columns: 1fr;
        padding: 1.5rem;
        margin-top: 3rem;
    }
}