/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 20px 0 10px 0;
    font-size: 0.9rem;
    color: var(--gray-600);
}
.breadcrumb a {
    color: var(--primary);
}
.breadcrumb a:hover {
    text-decoration: underline;
}

/* ===== 详情主区域 (左右两栏) ===== */
.detail-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin: 20px 0 40px 0;
}

/* 左列：规格参数 */
.detail-spec {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 24px 28px;
    border: 1px solid var(--gray-200);
}
.detail-spec h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.spec-table-wrap {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    overflow: hidden;
}
.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.spec-table th {
    background: var(--gray-50);
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    color: var(--gray-700);
    width: 35%;
    border-bottom: 1px solid var(--gray-200);
}
.spec-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
}
.spec-table tr:last-child td,
.spec-table tr:last-child th {
    border-bottom: none;
}

/* 右列：基本信息 + 查询表单 + 购买按钮 */
.detail-info h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}
.detail-info .sub {
    color: var(--gray-600);
    margin-bottom: 16px;
}
.detail-info .price-box {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin: 12px 0 8px 0;
}
.detail-info .price-current {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--primary);
}
.detail-info .price-old {
    font-size: 1.1rem;
    color: var(--gray-600);
    text-decoration: line-through;
}
.detail-info .stock {
    display: inline-block;
    background: #DCFCE7;
    color: #166534;
    padding: 4px 14px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.85rem;
    margin-top: 6px;
}
.quantity-box {
    margin: 16px 0 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}
.quantity-box label {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.95rem;
}
.quantity-control {
    display: flex;
    align-items: center;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    overflow: hidden;
    background: #fff;
}
.quantity-control .qty-btn {
    background: var(--gray-50);
    border: none;
    padding: 6px 14px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--gray-700);
    transition: var(--transition);
    min-width: 36px;
    text-align: center;
}
.quantity-control .qty-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}
.quantity-control .qty-btn:active {
    transform: scale(0.95);
}
.quantity-control input {
    width: 52px;
    text-align: center;
    border: none;
    border-left: 1px solid var(--gray-200);
    border-right: 1px solid var(--gray-200);
    padding: 6px 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    outline: none;
    background: #fff;
    -moz-appearance: textfield;
}
.quantity-control input::-webkit-outer-spin-button,
.quantity-control input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.detail-info .trust-badge {
    margin-top: 24px;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--gray-600);
}
.detail-info .trust-badge span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 查询表单 */
.inquiry-box {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 20px 24px;
    border: 1px solid var(--gray-200);
    margin: 20px 0 16px 0;
}
.inquiry-box .form-group {
    margin-bottom: 12px;
}
.inquiry-box .form-group label {
    display: block;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--gray-700);
    margin-bottom: 4px;
}
.inquiry-box .form-group input {
    width: 100%;
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--gray-200);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
}
.inquiry-box .form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* 购买按钮组 */
.detail-info .actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 6px;
}

/* ===== 卖点文案 ===== */
.desc-section {
    margin: 48px 0;
}
.desc-section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.desc-section ul {
    list-style: none;
    padding: 0;
}
.desc-section ul li {
    padding: 10px 0;
    display: flex;
    gap: 12px;
    align-items: flex-start;
    border-bottom: 1px solid var(--gray-100);
}
.desc-section ul li:last-child {
    border-bottom: none;
}
.desc-section ul li strong {
    min-width: 120px;
    font-weight: 600;
}

/* ===== FAQ ===== */
.faq-section {
    margin: 48px 0 40px 0;
}
.faq-section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.faq-item {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
}
.faq-question {
    background: #fff;
    padding: 18px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    user-select: none;
}
.faq-question:hover {
    background: var(--gray-50);
}
.faq-question .arrow {
    transition: transform 0.3s ease;
    font-size: 1.2rem;
}
.faq-item.open .faq-question .arrow {
    transform: rotate(180deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 24px;
    background: var(--gray-50);
    color: var(--gray-700);
}
.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 18px 24px;
}

/* ===== 售后保障条 ===== */
.guarantee-bar {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 24px 32px;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 16px;
    margin: 20px 0 40px 0;
    border: 1px solid var(--gray-200);
}
.guarantee-bar .item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    color: var(--gray-700);
}
.guarantee-bar .item .icon {
    font-size: 1.6rem;
}

/* ===== 客户评价 ===== */
.reviews-section {
    margin: 40px 0 48px 0;
}
.reviews-section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 20px;
}
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.review-card {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    padding: 20px 24px;
    box-shadow: var(--shadow);
}
.review-card .review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}
.review-card .review-header .avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}
.review-card .review-header .name {
    font-weight: 600;
}
.review-card .review-header .date {
    font-size: 0.8rem;
    color: var(--gray-600);
    margin-left: auto;
}
.review-card .stars {
    color: #F59E0B;
    letter-spacing: 2px;
    margin-bottom: 6px;
}
.review-card .review-text {
    color: var(--gray-700);
    font-size: 0.95rem;
}

/* ===== 相关账号 ===== */
.related-section {
    margin: 40px 0 60px 0;
}
.related-section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 20px;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}
.related-card {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    padding: 20px 24px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
}
.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.related-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 4px;
}
.related-card .sub {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-bottom: 12px;
}
.related-card .price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}
.related-card .btn-outline {
    padding: 8px 20px;
    font-size: 0.85rem;
}



/* ===== 响应式 ===== */
@media (max-width: 992px) {
    .detail-hero {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}
@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .guarantee-bar {
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
    }
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    .related-grid {
        grid-template-columns: 1fr 1fr;
    }
    .quantity-box {
        flex-wrap: wrap;
    }
}
@media (max-width: 640px) {
    .navbar {
        height: auto;
        padding: 12px 24px;
    }
    .navbar .container {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px 20px;
    }
    .nav-links a {
        font-size: 0.9rem;
        padding: 4px 0;
    }
    .detail-info h1 {
        font-size: 1.8rem;
    }
    .detail-info .price-current {
        font-size: 2rem;
    }
    .detail-info .actions {
        flex-direction: column;
        align-items: stretch;
    }
    .detail-info .actions .btn-primary,
    .detail-info .actions .btn-outline {
        width: 100%;
        text-align: center;
    }
    .detail-spec {
        padding: 16px;
    }
    .spec-table th,
    .spec-table td {
        padding: 10px 12px;
        font-size: 0.85rem;
    }
    .desc-section ul li {
        flex-direction: column;
        gap: 4px;
    }
    .desc-section ul li strong {
        min-width: auto;
    }
    .related-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .inquiry-box {
        padding: 16px;
    }
    .quantity-control input {
        width: 44px;
    }
}