/* ========================================== */
/* 1. 基础重置
/* ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: #fff;
    color: #111;
    line-height: 1.5;
}

.product-page {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 40px;
}

/* ========================================== */
/* 2. 模块1：产品展示区（左右两栏）
/* ========================================== */
.product-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    margin-bottom: 100px;
}

/* 左侧图片区 */
.product-images {
    position: relative;
}

.main-image {
    width: 100%;
    aspect-ratio: 3 / 4;
    background: #f5f5f5;
    overflow: hidden;
    border-radius: 0;
}

.main-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-counter {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: rgba(0,0,0,0.6);
    color: white;
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 0;
}

.image-nav {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
}

.nav-btn {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.9);
    border: 1px solid #ddd;
    border-radius: 0;
    cursor: pointer;
    font-size: 18px;
}

.nav-btn:hover {
    background: #fff;
    border-color: #999;
}

/* 右侧产品信息 */
.product-info h1 {
    font-size: 28px;
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.product-info .subtitle {
    font-weight: normal;
    color: #666;
    font-size: 18px;
}

.description {
    font-size: 14px;
    color: #444;
    line-height: 1.6;
    margin-bottom: 30px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    border-top: 1px solid #eee;
}

.spec-label {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 1px;
    color: #888;
}

.spec-value {
    font-size: 14px;
    color: #111;
}

.spec-action {
    margin-left: 12px;
    font-size: 16px;
    cursor: pointer;
    color: #999;
}

.spec-number {
    margin-left: 8px;
    font-size: 13px;
    color: #888;
}

.note {
    font-size: 12px;
    color: #888;
    margin: 20px 0;
    line-height: 1.5;
}

.accordion {
    margin: 20px 0;
    border-top: 1px solid #eee;
}

.accordion-item {
    border-bottom: 1px solid #eee;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    cursor: pointer;
}

.accordion-header:hover {
    opacity: 0.7;
}

.accordion-icon {
    font-size: 16px;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    font-size: 13px;
    color: #555;
}

.accordion-content.active {
    max-height: 200px;
    padding-bottom: 16px;
}

.image-numbers {
    display: flex;
    gap: 24px;
    margin: 30px 0 20px;
}

.image-numbers .num {
    font-size: 13px;
    color: #bbb;
    cursor: pointer;
}

.image-numbers .num.active {
    color: #111;
    font-weight: 500;
}

.retailer-link {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.retailer-link a {
    color: #111;
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 1px;
}

/* ========================================== */
/* 3. 通用标题样式
/* ========================================== */
.section-main-title {
    font-size: 11px;
    letter-spacing: 3px;
    color: #999;
    font-weight: 500;
    margin-bottom: 40px;
    text-transform: uppercase;
    text-align: center;
}

.section-subtitle {
    font-size: 28px;
    font-weight: 450;
    color: #111;
    margin-bottom: 30px;
    letter-spacing: 1px;
    text-align: center;
}

/* ========================================== */
/* 4. 模块2：设计革命区（左右两栏 + 单张大图）
/* ========================================== */
.design-revolution {
    margin-bottom: 100px;
}

.revolution-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 80px;
    align-items: start;
}

.revolution-left .section-subtitle {
    text-align: left;
    font-size: 28px;
    margin-bottom: 25px;
    margin-top: 200px;
}

.revolution-text {
    font-size: 15px;
    line-height: 1.7;
    color: #444;
}

.revolution-text p {
    margin-bottom: 20px;
}

.revolution-right {
    width: 100%;
}

.revolution-image-large {
    width: 100%;
    border-radius: 0;
    overflow: hidden;
}

.revolution-image-large img {
    width: 100%;
    height: auto;
    display: block;
}

/* ========================================== */
/* 5. 模块3：From Experiment to Icon 大图小图
/* ========================================== */
.experiment-section {
    max-width: 1200px;
    margin: 0 auto 100px;
    padding: 0 20px;
}

.experiment-text {
    font-size: 15px;
    line-height: 1.7;
    color: #444;
    margin-bottom: 40px;
}

.quote {
    background: #faf9f7;
    padding: 30px;
    margin: 30px 0;
    border-left: 4px solid #c8a87c;
}

.quote p {
    font-size: 15px;
    line-height: 1.7;
    color: #333;
    margin-bottom: 15px;
}

.quote-author {
    font-size: 13px;
    color: #888;
}

.experiment-images {
    display: grid;
    grid-template-columns: 1fr 0.8fr;
    align-items: center;
    gap: 60px;
    margin: 40px 0 20px;
}

.experiment-image-large,
.experiment-image-small {
    width: 100%;
    border-radius: 0;
    overflow: hidden;
    
}

.experiment-image-large img,
.experiment-image-small img {
    width: 100%;
    height: auto;
    display: block;
}

/* ========================================== */
/* 6. 模块4：工艺与制作过程
/* ========================================== */
.process-section {
    max-width: 800px;
    margin: 0px auto 80px;
    padding: 0 20px;
    text-align: center;
}

.process-text {
    font-size: 15px;
    line-height: 1.7;
    color: #444;
    margin-bottom: 10px;
    text-align: left;
}

.discover-link a {
    color: #111;
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 1px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 4px;
}

.discover-link a:hover {
    opacity: 0.6;
}

/* ========================================== */
/* 7. 模块5 & 6：左右图文混排
/* ========================================== */
.split-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 100px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 20px;
}

.split-image {
    width: 100%;
    border-radius: 0;
    overflow: hidden;
}

.split-image img {
    width: 100%;
    height: auto;
    display: block;
}

.split-title {
    font-size: 28px;
    font-weight: 450;
    letter-spacing: 1px;
    color: #111;
    margin-bottom: 20px;
}

.split-description {
    font-size: 15px;
    line-height: 1.7;
    color: #444;
    margin-bottom: 25px;
}

.split-link {
    color: #111;
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 1px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 4px;
}

.split-link:hover {
    opacity: 0.6;
}

/* 左边文字 + 右边图片（调换顺序） */
.image-right .split-text {
    order: 1;
}

.image-right .split-image {
    order: 2;
}

/* ========================================== */
/* 8. 模块7：全球合作伙伴 + 零售商
/* ========================================== */
.partners-section {
    max-width: 1400px;
    margin: 0 auto 100px;
    padding: 0 20px;
    text-align: center;
}

.partners-title {
    font-size: 28px;
    font-weight: 450;
    margin-bottom: 20px;
}

.partners-description {
    font-size: 15px;
    line-height: 1.7;
    color: #444;
    max-width: 600px;
    margin: 0 auto 20px;
}

.partners-link {
    margin-bottom: 40px;
}

.partners-link a {
    color: #111;
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 1px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 4px;
}

.partners-image {
    width: 100%;
    border-radius: 0;
    overflow: hidden;
}

.partners-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ========================================== */
/* 9. 通用图片说明样式
/* ========================================== */
.image-caption {
    font-size: 12px;
    color: #666;
    margin-top: 12px;
    line-height: 1.5;
    text-align: center;
}

.image-credits {
    display: block;
    font-size: 10px;
    color: #999;
    margin-top: 4px;
}

/* ========================================== */
/* 10. 响应式设计
/* ========================================== */
@media (max-width: 900px) {
    .product-page {
        padding: 30px 20px;
    }
    
    .product-container,
    .revolution-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .experiment-images {
        grid-template-columns: 1fr;
    }
    
    .split-block {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .image-right .split-text {
        order: 1;
    }
    
    .image-right .split-image {
        order: 2;
    }
}

@media (max-width: 768px) {
    .section-subtitle,
    .revolution-left .section-subtitle,
    .split-title,
    .partners-title {
        font-size: 22px;
    }
    
    .revolution-text,
    .experiment-text,
    .process-text,
    .split-description,
    .partners-description {
        font-size: 14px;
    }
    
    .quote {
        padding: 20px;
    }
    
    .quote p {
        font-size: 14px;
    }
}