/* ============================================
   About Page Styles - Zhongyou Heavy Industry
   ============================================ */

/* ============ Scroll Reveal ============ */
.zhongyou-about-reveal {
    opacity: 0;
    -webkit-transform: translateY(40px);
    transform: translateY(40px);
    -webkit-transition: opacity 0.8s ease-out, -webkit-transform 0.8s ease-out;
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    transition: opacity 0.8s ease-out, transform 0.8s ease-out, -webkit-transform 0.8s ease-out;
}

.zhongyou-about-reveal.zhongyou-about-visible {
    opacity: 1;
    -webkit-transform: translateY(0);
    transform: translateY(0);
}

.zhongyou-about-reveal-delay-1 { -webkit-transition-delay: 0.1s; transition-delay: 0.1s; }
.zhongyou-about-reveal-delay-2 { -webkit-transition-delay: 0.2s; transition-delay: 0.2s; }
.zhongyou-about-reveal-delay-3 { -webkit-transition-delay: 0.3s; transition-delay: 0.3s; }

/* ============ Section Base ============ */
.zhongyou-about-section {
    padding: 90px 0;
    position: relative;
    background: var(--zhongyou-color-bg-section);
}

.zhongyou-about-section-alt {
    background: var(--zhongyou-color-bg-light);
}

.zhongyou-about-section-dark {
    background: linear-gradient(135deg, var(--zhongyou-color-bg-dark) 0%, #132a4d 100%);
}

.zhongyou-about-section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.zhongyou-about-tag {
    display: inline-block;
    background: rgba(232, 97, 26, 0.1);
    color: var(--zhongyou-color-accent-dark);
    padding: 6px 16px;
    border-radius: var(--zhongyou-radius-full);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.zhongyou-about-section-dark .zhongyou-about-tag {
    background: rgba(240, 128, 64, 0.15);
    color: var(--zhongyou-color-accent-light);
}

.zhongyou-about-title {
    font-size: 36px;
    color: var(--zhongyou-color-text-dark);
    margin-bottom: 16px;
    font-weight: 700;
    line-height: 1.2;
}

.zhongyou-about-section-dark .zhongyou-about-title {
    color: var(--zhongyou-color-white);
}

.zhongyou-about-desc {
    color: var(--zhongyou-color-text-muted);
    font-size: 16px;
    line-height: 1.7;
}

.zhongyou-about-section-dark .zhongyou-about-desc {
    color: rgba(255, 255, 255, 0.75);
}

/* ============ Page Hero ============ */
.zhongyou-about-hero {
    position: relative;
    /* 高度随视口自适应：320px ~ 480px 之间平滑变化，
       小屏更矮、大屏更高，背景图就不会被强行拉满裁掉主体 */
    min-height: 320px;
    min-height: clamp(320px, 32vw, 480px);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    text-align: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.zhongyou-about-hero-bg {
    position: absolute;
    inset: 0;
    /* cover：按原图比例铺满，只裁不拉伸（不会变形/填充拉伸）；
       配合上面 clamp 高度 + 轻微缓慢缩放，画面主体始终可见 */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    -webkit-transform: scale(1.01);
    transform: scale(1.01);
    -webkit-animation: zhongyou-about-zoom 18s ease-in-out infinite alternate;
    animation: zhongyou-about-zoom 18s ease-in-out infinite alternate;
}

@-webkit-keyframes zhongyou-about-zoom {
    from { -webkit-transform: scale(1.01); transform: scale(1.01); }
    to { -webkit-transform: scale(1.05); transform: scale(1.05); }
}

@keyframes zhongyou-about-zoom {
    from { -webkit-transform: scale(1.01); transform: scale(1.01); }
    to { -webkit-transform: scale(1.05); transform: scale(1.05); }
}

.zhongyou-about-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(11, 29, 53, 0.92) 0%, rgba(11, 29, 53, 0.78) 50%, rgba(232, 97, 26, 0.25) 100%);
}

.zhongyou-about-hero-content {
    position: relative;
    z-index: 2;
}

/* ============ Breadcrumb（已挪到 Banner 下方，样式与产品列表页一致） ============ */
.zhongyou-about-crumb {
    background: var(--zhongyou-color-white);
    border-bottom: 1px solid var(--zhongyou-color-border);
}

.zhongyou-about-crumb .zhongyou-breadcrumb {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: start;
    -webkit-justify-content: flex-start;
    -ms-flex-pack: start;
    justify-content: flex-start;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    gap: 10px;
    padding: 16px 0;
    font-size: 14px;
    color: var(--zhongyou-color-text-muted);
}

.zhongyou-about-crumb .zhongyou-breadcrumb a {
    color: var(--zhongyou-color-text-body);
    -webkit-transition: color var(--zhongyou-transition);
    transition: color var(--zhongyou-transition);
}

.zhongyou-about-crumb .zhongyou-breadcrumb a:hover {
    color: var(--zhongyou-color-accent-dark);
}

.zhongyou-about-crumb .zhongyou-breadcrumb i {
    font-size: 11px;
    color: var(--zhongyou-color-accent);
}

.zhongyou-about-crumb .zhongyou-breadcrumb span {
    color: var(--zhongyou-color-accent-dark);
    font-weight: 600;
}

.zhongyou-about-hero-title {
    font-size: 48px;
    color: var(--zhongyou-color-white);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.zhongyou-about-hero-sub {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    max-width: 760px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ============ Company Intro ============ */
.zhongyou-about-intro-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 1.2fr;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    margin-bottom: 70px;
}

.zhongyou-about-intro-media {
    position: relative;
    border-radius: var(--zhongyou-radius-lg);
    overflow: hidden;
    box-shadow: var(--zhongyou-shadow-xl);
}

.zhongyou-about-intro-media::before {
    content: '';
    position: absolute;
    inset: 0;
    background: -webkit-linear-gradient(135deg, rgba(11, 29, 53, 0.15) 0%, transparent 50%);
    background: linear-gradient(135deg, rgba(11, 29, 53, 0.15) 0%, transparent 50%);
    z-index: 1;
}

.zhongyou-about-intro-media img {
    width: 100%;
    height: 460px;
    -o-object-fit: cover;
    object-fit: cover;
    -webkit-transition: -webkit-transform var(--zhongyou-transition-slow);
    transition: -webkit-transform var(--zhongyou-transition-slow);
    transition: transform var(--zhongyou-transition-slow);
    transition: transform var(--zhongyou-transition-slow), -webkit-transform var(--zhongyou-transition-slow);
}

.zhongyou-about-intro-media:hover img {
    -webkit-transform: scale(1.04);
    transform: scale(1.04);
}

.zhongyou-about-exp-badge {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: -webkit-linear-gradient(135deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-dark) 100%);
    background: linear-gradient(135deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-dark) 100%);
    color: var(--zhongyou-color-white);
    padding: 18px 22px;
    border-radius: var(--zhongyou-radius-lg);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 14px;
    box-shadow: var(--zhongyou-shadow-xl);
    z-index: 2;
}

.zhongyou-about-exp-num {
    font-size: 48px;
    font-weight: 800;
    line-height: 1;
}

.zhongyou-about-exp-label {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.5;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.zhongyou-about-cert-mini {
    position: absolute;
    top: 20px;
    right: 20px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: 8px;
    z-index: 2;
}

.zhongyou-about-cert-mini span {
    background: rgba(11, 29, 53, 0.85);
    color: var(--zhongyou-color-white);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 6px 12px;
    border-radius: var(--zhongyou-radius-full);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.zhongyou-about-intro-content p {
    color: var(--zhongyou-color-text-body);
    line-height: 1.8;
    margin-bottom: 16px;
}

.zhongyou-about-feature-list {
    margin: 24px 0 32px;
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 1fr;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.zhongyou-about-feature-list li {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--zhongyou-color-text-dark);
}

.zhongyou-about-feature-list i {
    color: var(--zhongyou-color-accent);
    font-size: 18px;
    -webkit-box-flex: 0;
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
}

.zhongyou-about-intro-actions {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    gap: 14px;
}

.zhongyou-btn-ghost-dark {
    background: transparent;
    color: var(--zhongyou-color-text-dark);
    border: 2px solid var(--zhongyou-color-border);
}

.zhongyou-btn-ghost-dark:hover {
    border-color: var(--zhongyou-color-accent);
    color: var(--zhongyou-color-accent-dark);
    -webkit-transform: translateY(-2px);
    transform: translateY(-2px);
}

/* ============ Stats Bar ============ */
.zhongyou-about-stats {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: repeat(4, 1fr);
    grid-template-columns: repeat(4, 1fr);
    background: -webkit-linear-gradient(135deg, var(--zhongyou-color-bg-dark) 0%, var(--zhongyou-color-primary-light) 100%);
    background: linear-gradient(135deg, var(--zhongyou-color-bg-dark) 0%, var(--zhongyou-color-primary-light) 100%);
    border-radius: var(--zhongyou-radius-lg);
    padding: 44px 30px;
    gap: 20px;
    text-align: center;
    box-shadow: var(--zhongyou-shadow-lg);
}

.zhongyou-about-stat {
    position: relative;
    padding: 0 24px;
}

.zhongyou-about-stat:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
    width: 1px;
    height: 60px;
    background: rgba(255, 255, 255, 0.15);
}

.zhongyou-about-stat-num {
    display: block;
    font-size: 44px;
    font-weight: 800;
    color: var(--zhongyou-color-accent-light);
    line-height: 1.1;
    margin-bottom: 8px;
    font-family: var(--zhongyou-font-mono);
}

.zhongyou-about-stat-label {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.75);
}

/* ============ Why Choose Us ============ */
.zhongyou-about-choose-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: repeat(3, 1fr);
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.zhongyou-about-choose-card {
    background: var(--zhongyou-color-white);
    border: 1px solid var(--zhongyou-color-border);
    border-radius: var(--zhongyou-radius-lg);
    padding: 36px 30px;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
    position: relative;
    overflow: hidden;
}

.zhongyou-about-choose-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: -webkit-linear-gradient(90deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-light) 100%);
    background: linear-gradient(90deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-light) 100%);
    -webkit-transform: scaleX(0);
    transform: scaleX(0);
    -webkit-transform-origin: left;
    transform-origin: left;
    -webkit-transition: -webkit-transform var(--zhongyou-transition);
    transition: -webkit-transform var(--zhongyou-transition);
    transition: transform var(--zhongyou-transition);
    transition: transform var(--zhongyou-transition), -webkit-transform var(--zhongyou-transition);
}

.zhongyou-about-choose-card:hover {
    -webkit-transform: translateY(-8px);
    transform: translateY(-8px);
    box-shadow: var(--zhongyou-shadow-lg);
    border-color: transparent;
}

.zhongyou-about-choose-card:hover::before {
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
}

.zhongyou-about-choose-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: rgba(232, 97, 26, 0.1);
    color: var(--zhongyou-color-accent-dark);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 22px;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-choose-card:hover .zhongyou-about-choose-icon {
    background: -webkit-linear-gradient(135deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-dark) 100%);
    background: linear-gradient(135deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-dark) 100%);
    color: var(--zhongyou-color-white);
}

.zhongyou-about-choose-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--zhongyou-color-text-dark);
}

.zhongyou-about-choose-card p {
    font-size: 14px;
    line-height: 1.75;
    color: var(--zhongyou-color-text-muted);
}

/* ============ Factory & Capabilities ============ */
.zhongyou-about-factory-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1.15fr 1fr;
    grid-template-columns: 1.15fr 1fr;
    gap: 60px;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}

.zhongyou-about-factory-content p {
    color: var(--zhongyou-color-text-body);
    line-height: 1.8;
    margin-bottom: 28px;
}

.zhongyou-about-capability-list {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 1fr;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.zhongyou-about-capability-list li {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: 14px;
    background: var(--zhongyou-color-bg-light);
    border: 1px solid var(--zhongyou-color-border);
    border-radius: var(--zhongyou-radius);
    padding: 18px;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-capability-list li:hover {
    border-color: rgba(232, 97, 26, 0.35);
    background: var(--zhongyou-color-white);
    box-shadow: var(--zhongyou-shadow-sm);
}

.zhongyou-about-capability-list i {
    color: var(--zhongyou-color-accent);
    font-size: 22px;
    -webkit-box-flex: 0;
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
    margin-top: 2px;
}

.zhongyou-about-capability-list strong {
    display: block;
    font-size: 14px;
    margin-bottom: 4px;
    color: var(--zhongyou-color-text-dark);
}

.zhongyou-about-capability-list span {
    font-size: 12.5px;
    line-height: 1.6;
    color: var(--zhongyou-color-text-muted);
}

.zhongyou-about-factory-media {
    position: relative;
    border-radius: var(--zhongyou-radius-lg);
    overflow: hidden;
    box-shadow: var(--zhongyou-shadow-xl);
}

.zhongyou-about-factory-media img {
    width: 100%;
    height: 480px;
    -o-object-fit: cover;
    object-fit: cover;
    -webkit-transition: -webkit-transform var(--zhongyou-transition-slow);
    transition: -webkit-transform var(--zhongyou-transition-slow);
    transition: transform var(--zhongyou-transition-slow);
    transition: transform var(--zhongyou-transition-slow), -webkit-transform var(--zhongyou-transition-slow);
}

.zhongyou-about-factory-media:hover img {
    -webkit-transform: scale(1.04);
    transform: scale(1.04);
}

.zhongyou-about-factory-float {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    background: rgba(11, 29, 53, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--zhongyou-color-white);
    border-radius: var(--zhongyou-radius);
    padding: 16px 20px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 14px;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

.zhongyou-about-factory-float i {
    color: var(--zhongyou-color-accent-light);
    font-size: 28px;
}

.zhongyou-about-factory-float strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}

.zhongyou-about-factory-float span {
    font-size: 12.5px;
    color: rgba(255, 255, 255, 0.7);
}

/* ============ Product Lines ============ */
.zhongyou-about-lines-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: repeat(3, 1fr);
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.zhongyou-about-line-card {
    background: var(--zhongyou-color-white);
    border-radius: var(--zhongyou-radius-lg);
    padding: 30px 26px;
    text-align: center;
    border: 1px solid var(--zhongyou-color-border);
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-line-card:hover {
    -webkit-transform: translateY(-6px);
    transform: translateY(-6px);
    box-shadow: var(--zhongyou-shadow-md);
    border-color: rgba(232, 97, 26, 0.3);
}

.zhongyou-about-line-card i {
    display: inline-block;
    font-size: 32px;
    color: var(--zhongyou-color-primary);
    margin-bottom: 18px;
    -webkit-transition: color var(--zhongyou-transition);
    transition: color var(--zhongyou-transition);
}

.zhongyou-about-line-card:hover i {
    color: var(--zhongyou-color-accent);
}

.zhongyou-about-line-card h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--zhongyou-color-text-dark);
}

.zhongyou-about-line-card p {
    font-size: 13.5px;
    line-height: 1.7;
    color: var(--zhongyou-color-text-muted);
}

/* ============ Certifications ============ */
.zhongyou-about-cert-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: repeat(4, 1fr);
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.zhongyou-about-cert-card {
    text-align: center;
    background: var(--zhongyou-color-bg-light);
    border: 1px solid var(--zhongyou-color-border);
    border-radius: var(--zhongyou-radius-lg);
    padding: 40px 26px;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-cert-card:hover {
    background: var(--zhongyou-color-white);
    box-shadow: var(--zhongyou-shadow-md);
    -webkit-transform: translateY(-6px);
    transform: translateY(-6px);
}

.zhongyou-about-cert-badge {
    width: 76px;
    height: 76px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: -webkit-linear-gradient(135deg, var(--zhongyou-color-primary) 0%, var(--zhongyou-color-secondary) 100%);
    background: linear-gradient(135deg, var(--zhongyou-color-primary) 0%, var(--zhongyou-color-secondary) 100%);
    color: var(--zhongyou-color-white);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    font-size: 30px;
    box-shadow: var(--zhongyou-shadow-md);
}

.zhongyou-about-cert-card h3 {
    font-size: 17px;
    margin-bottom: 10px;
    color: var(--zhongyou-color-text-dark);
}

.zhongyou-about-cert-card p {
    font-size: 13.5px;
    line-height: 1.7;
    color: var(--zhongyou-color-text-muted);
}

/* ============ Patents & Certificates（专利证书区） ============ */
.zhongyou-about-patent-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 30px 1fr;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.zhongyou-about-patent-card {
    position: relative;
    margin: 0;
    padding: 22px;
    overflow: hidden;
    background: var(--zhongyou-color-white);
    border: 1px solid var(--zhongyou-color-border);
    border-radius: var(--zhongyou-radius-lg);
    box-shadow: var(--zhongyou-shadow-sm);
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

/* 顶部橙色细线 */
.zhongyou-about-patent-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: -webkit-linear-gradient(left, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-light) 100%);
    background: linear-gradient(90deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-light) 100%);
}

.zhongyou-about-patent-card:hover {
    -webkit-transform: translateY(-6px);
    transform: translateY(-6px);
    border-color: rgba(232, 97, 26, 0.35);
    box-shadow: var(--zhongyou-shadow-lg);
}

/* 证书画框：浅色底 + 内阴影，像装裱好的证书 */
.zhongyou-about-patent-frame {
    position: relative;
    padding: 18px;
    overflow: hidden;
    border-radius: var(--zhongyou-radius-md);
    border: 1px solid var(--zhongyou-color-border);
    background: -webkit-linear-gradient(315deg, #f7f9fc 0%, #eef2f8 100%);
    background: linear-gradient(135deg, #f7f9fc 0%, #eef2f8 100%);
}

.zhongyou-about-patent-frame img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--zhongyou-radius-sm);
    box-shadow: 0 6px 18px rgba(11, 29, 53, 0.16);
    -webkit-transition: -webkit-transform var(--zhongyou-transition-slow);
    transition: -webkit-transform var(--zhongyou-transition-slow);
    transition: transform var(--zhongyou-transition-slow);
    transition: transform var(--zhongyou-transition-slow), -webkit-transform var(--zhongyou-transition-slow);
}

.zhongyou-about-patent-card:hover .zhongyou-about-patent-frame img {
    -webkit-transform: scale(1.03);
    transform: scale(1.03);
}

.zhongyou-about-patent-badge {
    position: absolute;
    top: 30px;
    right: 30px;
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 6px;
    padding: 6px 13px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--zhongyou-color-white);
    background: var(--zhongyou-color-accent);
    border-radius: var(--zhongyou-radius-full);
    box-shadow: 0 4px 12px rgba(232, 97, 26, 0.35);
}

.zhongyou-about-patent-card figcaption {
    padding: 22px 6px 4px;
    text-align: center;
}

.zhongyou-about-patent-card figcaption h3 {
    position: relative;
    padding-bottom: 14px;
    margin-bottom: 12px;
    font-size: 18px;
    line-height: 1.3;
    color: var(--zhongyou-color-text-dark);
}

.zhongyou-about-patent-card figcaption h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    width: 44px;
    height: 3px;
    border-radius: var(--zhongyou-radius-full);
    background: var(--zhongyou-color-accent);
}

.zhongyou-about-patent-card figcaption p {
    font-size: 13.5px;
    line-height: 1.75;
    color: var(--zhongyou-color-text-muted);
}

/* 证书下方的三个说明点 */
.zhongyou-about-patent-notes {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: (1fr)[3];
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 34px;
}

.zhongyou-about-patent-note {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 12px;
    padding: 16px 18px;
    background: var(--zhongyou-color-white);
    border: 1px dashed var(--zhongyou-color-border);
    border-radius: var(--zhongyou-radius-md);
}

.zhongyou-about-patent-note i {
    font-size: 20px;
    color: var(--zhongyou-color-accent);
}

.zhongyou-about-patent-note span {
    font-size: 13.5px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--zhongyou-color-text-body);
}

/* ============ Milestones / Timeline（横轴：年份在上、内容卡片在下） ============ */
/* 时间轴外层：左右留出箭头位置 */
.zhongyou-about-timeline-wrap {
    position: relative;
    padding: 0 64px;
}

/* 视口：一屏只显示一页，切换时由 js/about.js 平移内部轨道 */
.zhongyou-about-timeline-view {
    overflow: hidden;
    padding: 4px 0 2px;
}

.zhongyou-about-timeline {
    position: relative;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-wrap: nowrap;
    -ms-flex-wrap: nowrap;
    flex-wrap: nowrap;
    gap: 0;
    -webkit-transition: -webkit-transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
    transition: transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* 每页 4 个（窄屏由媒体查询逐级递减）；左右 padding 充当间距，轴线依然连续 */
.zhongyou-about-timeline-item {
    position: relative;
    -webkit-box-flex: 0;
    -webkit-flex: 0 0 25%;
    -ms-flex: 0 0 25%;
    flex: 0 0 25%;
    max-width: 25%;
    padding: 0 12px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    text-align: center;
}

/* 左右切换按钮（与轴线同一水平高度） */
.zhongyou-about-timeline-arrow {
    position: absolute;
    top: 73px;
    z-index: 5;
    width: 46px;
    height: 46px;
    margin-top: -23px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.18);
    outline: none;
    cursor: pointer;
    border-radius: 50%;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    font-size: 16px;
    line-height: 1;
    color: var(--zhongyou-color-white);
    background: rgba(255, 255, 255, 0.08);
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-timeline-arrow--prev {
    left: 0;
}

.zhongyou-about-timeline-arrow--next {
    right: 0;
}

.zhongyou-about-timeline-arrow:hover:not(:disabled) {
    background: var(--zhongyou-color-accent);
    border-color: var(--zhongyou-color-accent);
    -webkit-transform: scale(1.06);
    transform: scale(1.06);
}

.zhongyou-about-timeline-arrow:disabled {
    opacity: 0.28;
    cursor: not-allowed;
}

/* 分页圆点 */
.zhongyou-about-timeline-dots {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    gap: 10px;
    margin-top: 28px;
}

.zhongyou-about-timeline-dot {
    width: 9px;
    height: 9px;
    padding: 0;
    border: 0;
    outline: none;
    cursor: pointer;
    border-radius: var(--zhongyou-radius-full);
    background: rgba(255, 255, 255, 0.28);
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-timeline-dot:hover {
    background: rgba(255, 255, 255, 0.5);
}

.zhongyou-about-timeline-dot-active {
    width: 28px;
    background: var(--zhongyou-color-accent);
}

/* 只有一页时：隐藏箭头与圆点 */
.zhongyou-about-timeline-static .zhongyou-about-timeline-arrow,
.zhongyou-about-timeline-static .zhongyou-about-timeline-dots {
    display: none;
}

.zhongyou-about-timeline-static {
    padding: 0;
}

@media (prefers-reduced-motion: reduce) {
    .zhongyou-about-timeline {
        -webkit-transition: none;
        transition: none;
    }
}

/* 横向主轴：由每项自己画一段，拼成连续的一条线 */
.zhongyou-about-timeline-item::before {
    content: '';
    position: absolute;
    top: 73px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--zhongyou-color-accent);
}

/* 首尾只画一半，让轴线从一个节点延伸到最后一个节点 */
.zhongyou-about-timeline-item:first-child::before {
    left: 50%;
    width: 50%;
}

.zhongyou-about-timeline-item:last-child::before {
    width: 50%;
}

/* 轴上的圆点 */
.zhongyou-about-timeline-dot {
    position: absolute;
    top: 74px;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--zhongyou-color-accent);
    border: 3px solid var(--zhongyou-color-bg-dark);
    box-shadow: 0 0 0 4px rgba(232, 97, 26, 0.3);
    z-index: 2;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-timeline-item:hover .zhongyou-about-timeline-dot {
    -webkit-transform: translate(-50%, -50%) scale(1.3);
    transform: translate(-50%, -50%) scale(1.3);
    box-shadow: 0 0 0 7px rgba(232, 97, 26, 0.28);
}

/* 年份：轴上方 */
.zhongyou-about-timeline-year {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    height: 40px;
    margin-bottom: 34px;
    padding: 0 16px;
    background: rgba(240, 128, 64, 0.15);
    border: 1px solid rgba(240, 128, 64, 0.35);
    color: var(--zhongyou-color-accent-light);
    font-family: var(--zhongyou-font-mono);
    font-weight: 700;
    font-size: 15px;
    border-radius: var(--zhongyou-radius-full);
    letter-spacing: 0.05em;
    white-space: nowrap;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-timeline-item:hover .zhongyou-about-timeline-year {
    background: var(--zhongyou-color-accent);
    border-color: var(--zhongyou-color-accent);
    color: var(--zhongyou-color-white);
}

/* 内容卡片：轴下方 */
.zhongyou-about-timeline-content {
    width: 100%;
    margin-top: 40px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--zhongyou-radius-lg);
    padding: 22px 18px;
    -webkit-transition: all var(--zhongyou-transition);
    transition: all var(--zhongyou-transition);
}

.zhongyou-about-timeline-content:hover {
    border-color: rgba(240, 128, 64, 0.5);
    background: rgba(255, 255, 255, 0.09);
    -webkit-transform: translateY(-4px);
    transform: translateY(-4px);
}

.zhongyou-about-timeline-content h3 {
    font-size: 16px;
    line-height: 1.35;
    color: var(--zhongyou-color-white);
    margin-bottom: 8px;
}

.zhongyou-about-timeline-content p {
    font-size: 13px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.7);
}

/* ============ CTA Banner ============ */
.zhongyou-about-cta {
    padding: 90px 0;
    background: -webkit-linear-gradient(135deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-dark) 100%);
    background: linear-gradient(135deg, var(--zhongyou-color-accent) 0%, var(--zhongyou-color-accent-dark) 100%);
    position: relative;
    overflow: hidden;
}

.zhongyou-about-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: -webkit-radial-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px);
    background-image: radial-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px);
    background-size: 24px 24px;
}

.zhongyou-about-cta-inner {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 820px;
    margin: 0 auto;
}

.zhongyou-about-cta-inner h2 {
    font-size: 36px;
    color: var(--zhongyou-color-white);
    margin-bottom: 14px;
    font-weight: 800;
}

.zhongyou-about-cta-inner p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 32px;
}

.zhongyou-about-cta-actions {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    gap: 16px;
}

.zhongyou-about-cta-inner .zhongyou-btn-primary {
    background: var(--zhongyou-color-bg-dark);
    box-shadow: 0 8px 24px rgba(11, 29, 53, 0.35);
}

.zhongyou-about-cta-inner .zhongyou-btn-primary:hover {
    background: var(--zhongyou-color-white);
    color: var(--zhongyou-color-accent-dark);
}

.zhongyou-about-cta-inner .zhongyou-btn-outline {
    border-color: rgba(255, 255, 255, 0.85);
    color: var(--zhongyou-color-white);
}

.zhongyou-about-cta-inner .zhongyou-btn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--zhongyou-color-white);
    color: var(--zhongyou-color-white);
}

/* ============ Responsive ============ */
@media (max-width: 1200px) {
    .zhongyou-about-intro-grid,
    .zhongyou-about-factory-grid {
        gap: 40px;
    }

    .zhongyou-about-title {
        font-size: 32px;
    }

    .zhongyou-about-hero-title {
        font-size: 40px;
    }
}

@media (max-width: 991px) {
    .zhongyou-about-intro-grid,
    .zhongyou-about-factory-grid {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .zhongyou-about-intro-media img {
        height: 380px;
    }

    .zhongyou-about-factory-media img {
        height: 380px;
    }

    .zhongyou-about-choose-grid,
    .zhongyou-about-lines-grid {
        -ms-grid-columns: repeat(2, 1fr);
        grid-template-columns: repeat(2, 1fr);
    }

    .zhongyou-about-patent-notes {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .zhongyou-about-cert-grid {
        -ms-grid-columns: repeat(2, 1fr);
        grid-template-columns: repeat(2, 1fr);
    }

    .zhongyou-about-stats {
        -ms-grid-columns: repeat(2, 1fr);
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 20px;
    }

    .zhongyou-about-stat:nth-child(2)::after {
        display: none;
    }

    /* 横轴时间轴：窄屏每页显示数量逐级递减，由左右箭头切换 */
    .zhongyou-about-timeline-item {
        -webkit-flex: 0 0 33.3333%;
        -ms-flex: 0 0 33.3333%;
        flex: 0 0 33.3333%;
        max-width: 33.3333%;
        padding: 0 10px;
    }
}

@media (max-width: 767px) {
    .zhongyou-about-section {
        padding: 60px 0;
    }

    .zhongyou-about-section-header {
        margin-bottom: 40px;
    }

    .zhongyou-about-hero {
        min-height: 320px;
        padding: 100px 0 60px;
    }

    .zhongyou-about-hero-title {
        font-size: 32px;
    }

    .zhongyou-about-hero-sub {
        font-size: 15px;
    }

    .zhongyou-about-title {
        font-size: 26px;
    }

    .zhongyou-about-feature-list {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
    }

    .zhongyou-about-choose-grid,
    .zhongyou-about-lines-grid {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
    }

    .zhongyou-about-patent-grid {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
        gap: 22px;
    }

    .zhongyou-about-patent-badge {
        top: 24px;
        right: 24px;
    }

    .zhongyou-about-capability-list {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
    }

    .zhongyou-about-cert-grid {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
    }

    .zhongyou-about-intro-media img,
    .zhongyou-about-factory-media img {
        height: 300px;
    }

    .zhongyou-about-exp-badge {
        padding: 14px 16px;
    }

    .zhongyou-about-exp-num {
        font-size: 36px;
    }

    .zhongyou-about-cta-inner h2 {
        font-size: 28px;
    }

    /* 时间轴：手机端每页 2 个，箭头收小 */
    .zhongyou-about-timeline-wrap {
        padding: 0 44px;
    }

    .zhongyou-about-timeline-item {
        -webkit-flex: 0 0 50%;
        -ms-flex: 0 0 50%;
        flex: 0 0 50%;
        max-width: 50%;
        padding: 0 8px;
    }

    .zhongyou-about-timeline-arrow {
        width: 38px;
        height: 38px;
        margin-top: -19px;
        font-size: 14px;
    }

    .zhongyou-about-timeline-content {
        padding: 18px 14px;
    }
}

@media (max-width: 479px) {
    .zhongyou-about-stats {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
    }

    .zhongyou-about-stat::after {
        display: none;
    }

    .zhongyou-about-hero-title {
        font-size: 28px;
    }

    /* 时间轴：超小屏每页 1 个 */
    .zhongyou-about-timeline-wrap {
        padding: 0 40px;
    }

    .zhongyou-about-timeline-item {
        -webkit-flex: 0 0 100%;
        -ms-flex: 0 0 100%;
        flex: 0 0 100%;
        max-width: 100%;
    }
}