/* 全局重置 + 首页基础样式（保留首页所有样式） */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    color: #333;
    font-size: 16px;
    line-height: 1.5;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 首页原有样式（顶部信息栏、导航、移动端导航、页脚等）全部保留，以下仅新增 About Us 专属样式 */

/* About Banner 区域 */
.about-banner {
    position: relative;
    color: #fff;
}

.about-banner .container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 5%;
    z-index: 2;
}

.breadcrumb {
    font-size: 14px;
    margin-bottom: 15px;
}

.breadcrumb a {
    color: #fff;
    text-decoration: none;
}

.breadcrumb span {
    color: #fff;
    font-weight: 600;
}

.about-banner h1 {
    font-size: 48px;
    text-transform: uppercase;
    font-weight: bold;
    margin-bottom: 15px;
}

.about-banner p {
    font-size: 18px;
    max-width: 600px;
    line-height: 1.6;
}

.banner-img img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    filter: brightness(0.6);
}

/* Who We Are 区域 */
.who-we-are {
    padding: 80px 0;
    background-color: #fff;
}

.who-we-are .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.section-label {
    font-size: 14px;
    color: #0066cc;
    text-transform: uppercase;
    margin-bottom: 10px;
    font-weight: normal;
}

.who-left h3 {
    font-size: 32px;
    color: #0f2942;
    text-transform: uppercase;
    margin-bottom: 20px;
    line-height: 1.3;
}

.who-left p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.view-products-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: #0066cc;
    color: #fff;
    text-decoration: none;
    padding: 10px 25px;
    text-transform: uppercase;
    font-weight: 600;
    font-size: 14px;
    margin-top: 10px;
    transition: background-color 0.3s ease;
}

.view-products-btn:hover {
    background-color: #004c99;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background-color: #f9f9f9;
    padding: 30px 20px;
    text-align: center;
    border-radius: 0;
}

.stat-card i {
    font-size: 36px;
    color: #0066cc;
    margin-bottom: 15px;
}

.stat-num {
    font-size: 32px;
    font-weight: bold;
    color: #0f2942;
    display: block;
    margin-bottom: 5px;
}

.stat-text {
    font-size: 14px;
    color: #666;
    text-transform: uppercase;
}

/* Why Choose Us 区域 */
.why-choose-us {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.why-choose-us .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.why-left h3 {
    font-size: 32px;
    color: #0f2942;
    text-transform: uppercase;
    margin-bottom: 20px;
    line-height: 1.3;
}

.why-left p {
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

.learn-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #0066cc;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 30px;
}

.learn-more-btn:hover {
    text-decoration: underline;
}

.why-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
}

.feature-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #0066cc;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.feature-icon i {
    font-size: 20px;
}

.feature-text h4 {
    font-size: 16px;
    color: #0f2942;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.feature-text p {
    font-size: 14px;
    color: #666;
    margin-bottom: 0;
}

.why-right img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* Our History 时间轴 */
.our-history {
    padding: 80px 0;
    background-color: #fff;
}

.our-history .container {
    max-width: 1000px;
}

.timeline {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 40px;
    padding-top: 20px;
    padding-bottom: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #0066cc;
    z-index: 1;
}

.timeline-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 16%;
    text-align: center;
    z-index: 2;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #0066cc;
    margin-bottom: 15px;
}

.timeline-year {
    font-size: 18px;
    font-weight: bold;
    color: #0f2942;
    margin-bottom: 10px;
}

.timeline-item p {
    font-size: 14px;
    color: #666;
    line-height: 1.4;
}

/* Certifications 证书区 */
.certifications {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.certifications h3 {
    font-size: 32px;
    color: #0f2942;
    text-transform: uppercase;
    margin-bottom: 40px;
    line-height: 1.3;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.cert-item img {
    width: 100%;
    height: auto;
    border: 1px solid #ddd;
    transition: transform 0.3s ease;
}

.cert-item img:hover {
    transform: scale(1.05);
}

/* 响应式适配 */
@media (max-width: 1024px) {
    .about-banner h1 {
        font-size: 36px;
    }
    .who-we-are .container,
    .why-choose-us .container {
        grid-template-columns: 1fr;
    }
    .who-right {
        margin-top: 40px;
    }
    .why-right {
        margin-top: 40px;
    }
    .timeline {
        flex-wrap: wrap;
        gap: 20px;
    }
    .timeline-item {
        width: 30%;
        margin-bottom: 20px;
    }
}

@media (max-width: 768px) {
    .about-banner h1 {
        font-size: 28px;
    }
    .about-banner p {
        font-size: 16px;
    }
    .banner-img img {
        height: 300px;
    }
    .who-left h3,
    .why-left h3,
    .certifications h3 {
        font-size: 24px;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .why-features {
        grid-template-columns: 1fr;
    }
    .timeline-item {
        width: 45%;
    }
}

@media (max-width: 480px) {
    .about-banner h1 {
        font-size: 22px;
    }
    .banner-img img {
        height: 250px;
    }
    .timeline {
        flex-direction: column;
        align-items: flex-start;
        gap: 30px;
    }
    .timeline::before {
        width: 2px;
        height: 100%;
        left: 10px;
        top: 0;
    }
    .timeline-item {
        width: 100%;
        flex-direction: row;
        align-items: flex-start;
        gap: 20px;
        text-align: left;
    }
    .timeline-dot {
        margin-bottom: 0;
        margin-top: 5px;
    }
    .cert-grid {
        grid-template-columns: 1fr;
    }
}

/* 首页原有响应式样式（768px/480px 适配）全部保留 */