/* =========================================
   关于页专用 CSS (about.css)
   与首页完全物理隔离，包含所有完整样式
========================================= */
:root {
    --brand-red: #d41e2a; 
    --deep-dark: #111827; 
    --gray-bg: #f9f9f9;
    --brand-orange: #ff712b; /* 保持与首页CTA颜色一致 */
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Barlow', sans-serif; color: #222; background: #fff; line-height: 1.7; }
img { width: 100%; display: block; }
a { text-decoration: none; }
ul { list-style: none; }
.container { width: 90%; max-width: 1200px; margin: auto; }

/* HEADER (保持与全站外观一致) */
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 9999; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255,255,255,.2); }
.nav-container { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo a{ font-size:30px; font-weight:800; color:#111; }
.navbar ul { display: flex; gap: 40px; }
.navbar a { color: #222; font-weight: 500; transition: .3s; }
.navbar a:hover, .navbar a.active { color: var(--brand-red); }
.mobile-toggle { display: none; font-size: 32px; cursor: pointer; color: #111; }

/* ABOUT HERO (修复被导航遮挡的问题) */
.about-hero {
    padding: 180px 0 100px; /* 顶部预留导航高度 */
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('../images/factory-hero.jpg') center/cover no-repeat;
    text-align: center; color: #fff;
}
.about-hero h1 { font-size: 3.5rem; margin-bottom: 20px; font-weight: 800; }
.about-hero p { font-size: 1.25rem; max-width: 800px; margin: auto; }

/* INTRO SECTION (彻底解决右下角留空) */
.intro-section { padding: 100px 0; }
.intro-grid { 
    display: flex; 
    align-items: center; /* 核心：垂直绝对居中 */
    gap: 60px; 
    flex-wrap: wrap; 
}
.intro-text { flex: 1.2; min-width: 320px; }
.intro-image { flex: 1; min-width: 320px; }
.intro-image img { border-radius: 8px; box-shadow: 15px 15px 0px rgba(212, 30, 42, 0.1); }
.section-tag { color: var(--brand-red); font-weight: 800; letter-spacing: 1px; display: block; margin-bottom: 10px; }

/* =========================================
   核心修改：错位重叠时间轴 (Overlapping Timeline)
========================================= */
.timeline-section { padding: 80px 0; background: var(--gray-bg); }
.timeline-main { position: relative; max-width: 1000px; margin: 0 auto; }

/* 极细中轴线 */
.timeline-main::after { 
    content: ''; position: absolute; width: 1px; background: #ddd; 
    top: 0; bottom: 0; left: 50%; 
}

.timeline-box { 
    position: relative; 
    width: 50%; 
    padding: 0 40px; 
    box-sizing: border-box;
    /* 关键：通过负边距实现向上重叠 */
    margin-top: -60px; 
}

/* 第一个元素不需要向上重叠 */
.timeline-box:first-child { margin-top: 0; }

.left-box { left: 0; text-align: right; }
.right-box { left: 50%; text-align: left; }

/* 扁平化空心圆点 */
.timeline-box::after { 
    content: ''; position: absolute; width: 10px; height: 10px; 
    background: var(--gray-bg); border: 2px solid var(--brand-red); 
    border-radius: 50%; top: 30px; z-index: 2; 
}
.left-box::after { right: -6px; }
.right-box::after { left: -6px; }

/* 扁平化卡片样式 */
.timeline-content { 
    background: #fff; 
    padding: 25px; 
    border-radius: 4px; 
    border: 1px solid var(--border-color);
    transition: 0.3s;
}
.timeline-content:hover { border-color: var(--brand-red); }
.timeline-content h4 { color: var(--brand-red); font-size: 1.3rem; margin-bottom: 8px; font-weight: 700; }
.timeline-content p { font-size: 0.95rem; color: #666; margin: 0; }

/* STAT BAR & CARDS */
.stat-bar { background: var(--deep-dark); color: #fff; padding: 60px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; text-align: center; }
.stat-item h2 { font-size: 3rem; color: var(--brand-red); margin-bottom: 10px; }

.fancy-card { background: #fff; padding: 40px; border-top: 5px solid var(--brand-red); box-shadow: 0 15px 40px rgba(0,0,0,0.05); transition: .3s; text-align: left; }
.fancy-card:hover { transform: translateY(-10px); }
.spec-list { margin-top: 25px; }
.spec-list li { padding: 12px 0; border-bottom: 1px solid #eee; display: flex; }
.spec-list li strong { color: var(--brand-red); margin-right: 10px; }

/* CTA SECTION (修复错误，变为品牌橙底白字) */
.cta-section { padding: 100px 0; background: var(--brand-orange); text-align: center; color: #fff; }
.cta-content h2 { font-size: 42px; margin-bottom: 20px; }
.cta-content p { font-size: 20px; margin-bottom: 30px; }
.btn-primary { display: inline-block; background: #fff; color: var(--brand-orange); padding: 16px 38px; border-radius: 5px; font-weight: 600; transition: .3s; }
.btn-primary:hover { background: #f2f2f2; transform: translateY(-3px); }

/* FOOTER (保持完整) */
.footer { background: #111827; color: #ccc; padding-top: 80px; }
.footer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 60px; padding-bottom: 60px; }
.footer-column h3 { color: #fff; margin-bottom: 25px; }
.footer-column li { margin-bottom: 12px; }
.footer-column a { color: #ccc; transition: .3s; }
.footer-column a:hover { color: var(--brand-red); }
.copyright { border-top: 1px solid rgba(255,255,255,.08); text-align: center; padding: 25px 0; color: #888; }

/* ABOUT MOBILE RESPONSIVE */
@media (max-width: 768px) {
    .mobile-toggle { display: block; }
    .navbar { position: absolute; top: 82px; left: 0; width: 100%; background: #fff; display: none; border-top: 1px solid #eee; box-shadow: 0 10px 30px rgba(0,0,0,.08); }
    .navbar.active { display: block; }
    .navbar ul { flex-direction: column; gap: 0; }
    .navbar a { display: block; padding: 18px 25px; border-bottom: 1px solid #f2f2f2; }
    
    .about-hero h1 { font-size: 2.5rem; }
    .intro-grid { flex-direction: column; text-align: center; }
    
    /* 移动端时间轴对齐参数 */
    .timeline-main::after { left: 31px; }
    .timeline-box { width: 100%; padding-left: 70px; padding-right: 20px; text-align: left; }
    .left-box, .right-box { left: 0; }
    .timeline-box::after { left: 22px; } /* 修正这里，让空心圆完美套住中轴线 */
    
    .footer-grid { grid-template-columns: 1fr; }
    .cta-content h2 { font-size: 32px; }
}
/* =========================
   MOBILE TIMELINE FIX
========================= */

@media (max-width: 768px) {

    .timeline-main {
        position: relative;
        padding-left: 30px;
    }

    /* 中线移动到左边 */
    .timeline-main::before {
        left: 10px !important;
        transform: none !important;
    }

    /* 所有box统一 */
    .timeline-box {
        width: 100% !important;
        padding-left: 30px !important;
        padding-right: 0 !important;
        left: 0 !important;
        text-align: left !important;
        margin-bottom: 70px;
    }

    /* 清除左右布局 */
    .left-box,
    .right-box {
        left: 0 !important;
    }

    /* 内容宽度恢复 */
    .timeline-content {
        width: 100%;
    }

    /* 圆点位置 */
    .timeline-box::before {
        left: -28px !important;
        right: auto !important;
    }

}
/* =========================
   CONTACT PAGE
========================= */

.contact-grid{
    display:grid;
    grid-template-columns: 1fr 1.1fr;
    gap:60px;
    align-items:start;
}

.contact-card{
    background:#fff;
    padding:25px;
    border-radius:10px;
    margin-bottom:20px;
    box-shadow:0 5px 20px rgba(0,0,0,0.05);
}

.contact-card h3{
    margin-bottom:10px;
    color:var(--brand-red);
}

.contact-form-wrap{
    background:#fff;
    padding:40px;
    border-radius:12px;
    box-shadow:0 10px 30px rgba(0,0,0,0.06);
}

.contact-form{
    display:flex;
    flex-direction:column;
    gap:20px;
}

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

.contact-form input,
.contact-form textarea{
    width:100%;
    padding:16px;
    border:1px solid #ddd;
    border-radius:8px;
    font-size:15px;
    font-family:'Barlow', sans-serif;
}

.contact-form textarea{
    resize:vertical;
}

.contact-form input:focus,
.contact-form textarea:focus{
    outline:none;
    border-color:var(--brand-red);
}

@media(max-width:768px){

    .contact-grid{
        grid-template-columns:1fr;
        gap:40px;
    }

    .form-row{
        grid-template-columns:1fr;
        gap:20px;
    }

    .contact-form-wrap{
        padding:25px;
    }

}

/* =========================
   PRODUCT DETAIL PAGE
========================= */

.product-detail-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:60px;
    align-items:start;
}

.main-product-image img{
    width:100%;
    border-radius:12px;
}

.thumb-gallery{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:15px;
    margin-top:20px;
}

.thumb-gallery img{
    width:100%;
    border-radius:8px;
}

.product-detail-content h2{
    margin:15px 0 25px;
}

.product-detail-content p{
    margin-bottom:20px;
}

.product-feature-list{
    display:flex;
    flex-direction:column;
    gap:15px;
    margin:35px 0;
}

.feature-item{
    background:#fff;
    padding:16px 20px;
    border-radius:8px;
    box-shadow:0 5px 15px rgba(0,0,0,0.05);
    font-weight:600;
}

.spec-table-wrap{
    overflow-x:auto;
}

/* Scrollable parameter panel — long tables without stretching the page */
.product-params-scroll{
    max-height:min(420px, 55vh);
    overflow-y:auto;
    overflow-x:auto;
    border:1px solid #ddd;
    border-radius:8px;
    background:#fff;
    -webkit-overflow-scrolling:touch;
}

.product-params-scroll .spec-table{
    margin:0;
}

/* Second block: original full-width spec table + separate scrollable detail list */
.product-detail-extended{
    padding:56px 0 72px;
    background:#fff;
}

.product-detail-extended-head{
    text-align:center;
    margin-bottom:28px;
}

.product-detail-extended-head h2{
    margin:10px 0 12px;
}

.product-detail-extended-head p{
    color:#666;
    font-size:0.95rem;
    max-width:680px;
    margin:0 auto;
    line-height:1.65;
}

/* Product detail — Applications ("Where DO seals excel"): scales with card count */
.product-applications-section{
    padding:80px 0;
}

.product-applications-intro{
    text-align:center;
    margin-bottom:clamp(36px,5vw,52px);
}

.product-applications-intro h2{
    margin-top:0.35em;
}

.applications-lead{
    color:#555;
    max-width:720px;
    margin:12px auto 0;
    line-height:1.7;
}

.product-applications-grid{
    display:grid;
    /* 1 col narrow → 2 → 3+ on wide screens; works for 3, 6, 9… cards without layout tweaks */
    grid-template-columns:repeat(auto-fill, minmax(min(100%, 300px), 1fr));
    gap:clamp(20px, 2.5vw, 30px);
    align-items:stretch;
}

.product-applications-grid .fancy-card{
    height:100%;
    display:flex;
    flex-direction:column;
    margin:0;
}

.product-applications-grid .fancy-card h3{
    margin-bottom:14px;
    color:var(--brand-red);
    font-size:1.15rem;
}

.product-applications-grid .fancy-card p{
    margin:0;
    flex:1;
    color:#444;
    font-size:0.98rem;
    line-height:1.65;
}

@media(max-width:768px){

    .product-applications-section{
        padding:56px 0;
    }

    .product-applications-intro{
        margin-bottom:32px;
    }

}

/* Compact “related series” strip */
.related-series-compact{
    padding:36px 0;
    background:var(--gray-bg);
}

.related-series-compact .related-series-head{
    text-align:center;
    margin-bottom:22px;
}

.related-series-compact .related-series-head h2{
    font-size:1.35rem;
    margin:8px 0 0;
    font-weight:700;
}

.related-series-compact .related-series-head p{
    display:none;
}

.related-series-row{
    display:flex;
    flex-wrap:wrap;
    gap:14px;
    justify-content:center;
    align-items:stretch;
    max-width:900px;
    margin:0 auto;
}

.related-series-item{
    flex:1 1 200px;
    max-width:280px;
    display:flex;
    gap:12px;
    align-items:center;
    padding:10px 12px;
    background:#fff;
    border:1px solid #e8e8e8;
    border-radius:8px;
    text-decoration:none;
    color:inherit;
    transition:border-color .25s, box-shadow .25s;
}

.related-series-item:hover{
    border-color:var(--brand-red);
    box-shadow:0 6px 18px rgba(0,0,0,.06);
}

.related-series-item img{
    width:72px;
    height:72px;
    object-fit:cover;
    border-radius:6px;
    flex-shrink:0;
}

.related-series-item .related-series-text h3{
    font-size:0.95rem;
    margin:0 0 4px;
    color:var(--deep-dark);
    font-weight:700;
}

.related-series-item .related-series-text p{
    font-size:0.82rem;
    color:#666;
    margin:0;
    line-height:1.45;
}

.spec-table{
    width:100%;
    border-collapse:collapse;
    background:#fff;
}

.spec-table th,
.spec-table td{
    padding:18px 20px;
    border:1px solid #eee;
    text-align:left;
}

.spec-table th{
    width:260px;
    background:#f7f7f7;
    font-weight:700;
}

@media(max-width:768px){

    .product-detail-grid{
        grid-template-columns:1fr;
    }

    .product-params-scroll{
        max-height:min(50vh,360px);
    }

    .related-series-item{
        max-width:100%;
    }

}

/* =========================
   BREADCRUMB
========================= */

.breadcrumb-section{
    background:#f5f5f5;
    padding:12px 0;
    border-bottom:1px solid #e5e5e5;
}

/* Breadcrumb sits directly under page hero (fixed header offset handled by hero padding) */
.breadcrumb-after-hero{
    border-top:1px solid #e8e8e8;
}

.breadcrumb-wrap{
    display:flex;
    align-items:center;
    gap:10px;
    flex-wrap:wrap;
    font-size:14px;
}

.breadcrumb-wrap a{
    color:#666;
    transition:0.3s;
}

.breadcrumb-wrap a:hover{
    color:var(--brand-red);
}

.breadcrumb-wrap span{
    color:#999;
}

.breadcrumb-current{
    color:#333;
    font-weight:700;
}

/* Product detail CTAs */
.product-detail-actions{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:16px;
    margin-top:28px;
}

.btn-outline{
    display:inline-block;
    border:2px solid var(--brand-red);
    color:var(--brand-red);
    background:transparent;
    padding:14px 32px;
    border-radius:5px;
    font-weight:600;
    transition:.3s;
}

.btn-outline:hover{
    background:var(--brand-red);
    color:#fff;
}

/* =========================
   PRODUCTS LANDING PAGE (SEO / conversion layout)
========================= */

.products-landing-hero h1{
    max-width:920px;
    margin-left:auto;
    margin-right:auto;
    font-size:clamp(1.85rem, 4vw, 2.75rem);
    line-height:1.15;
}

.products-hero-eyebrow{
    text-transform:uppercase;
    letter-spacing:0.12em;
    font-size:0.78rem;
    font-weight:700;
    color:rgba(255,255,255,.75);
    margin-bottom:14px;
}

.products-hero-sub{
    max-width:820px;
    margin:18px auto 0;
    line-height:1.7;
    font-size:1.08rem;
    color:rgba(255,255,255,.88);
}

.products-hero-cta{
    display:flex;
    flex-wrap:wrap;
    gap:16px;
    justify-content:center;
    align-items:center;
    margin-top:28px;
}

.products-hero-btn-light{
    background:#fff;
    color:var(--brand-orange);
}

.products-hero-btn-ghost{
    display:inline-block;
    border:2px solid rgba(255,255,255,.85);
    color:#fff;
    background:transparent;
    padding:14px 32px;
    border-radius:5px;
    font-weight:600;
    transition:background .25s, color .25s;
}

.products-hero-btn-ghost:hover{
    background:#fff;
    color:var(--deep-dark);
}

.products-split-landing{
    padding:clamp(56px, 8vw, 96px) 0 clamp(72px, 10vw, 112px);
    background:#fff;
}

.products-split-applications{
    padding:clamp(56px, 8vw, 96px) 0 clamp(72px, 10vw, 112px);
    background:var(--gray-bg);
}

.products-split-intro{
    text-align:center;
    max-width:880px;
    margin:0 auto clamp(48px, 7vw, 72px);
}

.products-split-intro--on-gray .products-split-lead a{
    color:var(--brand-red);
    font-weight:600;
}

.products-split-intro--on-gray .products-split-lead a:hover{
    text-decoration:underline;
}

.products-split-intro h2{
    margin-top:12px;
    font-size:clamp(1.75rem, 3.2vw, 2.35rem);
    line-height:1.2;
    color:var(--deep-dark);
}

.products-split-lead{
    color:#444;
    font-size:1.06rem;
    line-height:1.75;
    margin-top:18px;
}

.products-split-lead-secondary{
    color:#555;
    font-size:1rem;
    line-height:1.75;
    margin-top:14px;
}

.products-split-stack{
    display:flex;
    flex-direction:column;
    gap:clamp(48px, 7vw, 88px);
}

.products-split-row{
    display:grid;
    grid-template-columns:minmax(0, 1.05fr) minmax(0, 1fr);
    gap:clamp(28px, 4vw, 56px);
    align-items:center;
}

.products-split-row--reverse{
    direction:rtl;
}

.products-split-row--reverse > *{
    direction:ltr;
}

/* 错位：偶数行整体略下沉，形成阶梯节奏（移动端取消） */
@media(min-width:769px){

    .products-split-stack .products-split-row:nth-child(even){
        margin-top:8px;
        transform:translateY(20px);
    }

    .products-split-stack .products-split-row:nth-child(even) .products-split-media{
        transform:translateY(12px);
    }

}

.products-split-media{
    margin:0;
    border-radius:14px;
    overflow:hidden;
    box-shadow:0 20px 50px rgba(0,0,0,0.08);
    border:1px solid #e8e8e8;
}

.products-split-media img{
    width:100%;
    height:auto;
    display:block;
    aspect-ratio:4 / 3;
    object-fit:cover;
    vertical-align:middle;
}

.products-split-media a{
    display:block;
}

.products-split-copy h3{
    font-size:clamp(1.35rem, 2.4vw, 1.75rem);
    margin-bottom:14px;
    color:var(--deep-dark);
}

.products-split-copy > p{
    color:#444;
    font-size:1.05rem;
    line-height:1.75;
    margin-bottom:16px;
}

.products-split-list{
    margin:12px 0 20px;
    padding-left:1.15rem;
    color:#555;
    font-size:0.98rem;
    line-height:1.65;
}

.products-split-list li{
    margin-bottom:10px;
}

.products-split-list li::marker{
    color:var(--brand-red);
}

.products-split-actions{
    display:flex;
    flex-wrap:wrap;
    gap:14px 22px;
    align-items:center;
    margin-top:8px;
}

.products-split-row .btn-primary{
    background:var(--brand-orange);
    color:#fff;
}

.products-split-row .btn-primary:hover{
    background:#e86520;
    color:#fff;
}

.products-split-link-secondary{
    font-weight:600;
    color:var(--brand-red);
    border-bottom:1px solid transparent;
}

.products-split-link-secondary:hover{
    border-bottom-color:var(--brand-red);
}

.products-app-tags{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
}

/* Applications — 3-column card grid (aligned with product category cards) */
.products-app-grid{
    display:grid;
    grid-template-columns:repeat(3, minmax(0, 1fr));
    gap:clamp(22px, 3vw, 28px);
}

.products-app-card{
    background:#fff;
    border-radius:12px;
    overflow:hidden;
    border:1px solid #e8e8e8;
    box-shadow:0 15px 40px rgba(0,0,0,0.06);
    transition:transform .3s, box-shadow .3s;
    display:flex;
    flex-direction:column;
    height:100%;
}

.products-app-card:hover{
    transform:translateY(-6px);
    box-shadow:0 22px 48px rgba(0,0,0,0.1);
}

.products-app-card__media{
    margin:0;
    overflow:hidden;
}

.products-app-card__media img{
    width:100%;
    display:block;
    aspect-ratio:4 / 3;
    object-fit:cover;
}

.products-app-card__body{
    padding:20px 20px 22px;
    display:flex;
    flex-direction:column;
    flex:1;
}

.products-app-card__body h3{
    font-size:1.15rem;
    margin-bottom:10px;
    color:var(--deep-dark);
}

.products-app-card__body > p{
    color:#555;
    font-size:0.95rem;
    line-height:1.65;
    margin-bottom:12px;
}

.products-app-card__list{
    margin:0 0 14px;
    padding-left:1.1rem;
    color:#555;
    font-size:0.88rem;
    line-height:1.55;
}

.products-app-card__list li{
    margin-bottom:6px;
}

.products-app-card__list li::marker{
    color:var(--brand-red);
}

.products-app-card .products-app-tags{
    margin-top:auto;
    padding-top:4px;
}

.products-app-card .products-app-tags span{
    font-size:12px;
    padding:6px 12px;
    border-radius:999px;
    background:#f5f5f5;
    border:1px solid #e0e0e0;
    color:#444;
}

@media(max-width:992px){

    .products-app-grid{
        grid-template-columns:repeat(2, minmax(0, 1fr));
    }

}

@media(max-width:576px){

    .products-app-grid{
        grid-template-columns:1fr;
    }

}

.products-faq-section{
    padding:clamp(56px, 8vw, 88px) 0;
    background:#fff;
    border-top:1px solid #eee;
}

.products-faq-title{
    text-align:center;
    font-size:clamp(1.5rem, 2.8vw, 2rem);
    margin-bottom:10px;
}

.products-faq-intro{
    text-align:center;
    color:#666;
    max-width:560px;
    margin:0 auto 36px;
    line-height:1.65;
}

.products-faq-grid{
    max-width:800px;
    margin:0 auto;
    display:flex;
    flex-direction:column;
    gap:12px;
}

.products-faq-item{
    border:1px solid #e5e5e5;
    border-radius:10px;
    padding:0;
    background:#fafafa;
}

.products-faq-item summary{
    cursor:pointer;
    padding:18px 22px;
    font-weight:600;
    color:var(--deep-dark);
    list-style:none;
}

.products-faq-item summary::-webkit-details-marker{
    display:none;
}

.products-faq-item summary::after{
    content:"+";
    float:right;
    color:var(--brand-red);
    font-weight:800;
}

.products-faq-item[open] summary::after{
    content:"−";
}

.products-faq-answer{
    padding:0 22px 18px;
    border-top:1px solid #eee;
    background:#fff;
}

.products-faq-answer p{
    margin:0;
    padding-top:14px;
    color:#555;
    line-height:1.7;
    font-size:0.98rem;
}

.products-cta-row{
    display:flex;
    flex-wrap:wrap;
    gap:16px 28px;
    justify-content:center;
    align-items:center;
    margin-top:8px;
}

.products-cta-mail,
.products-cta-wa{
    font-weight:600;
    color:#fff;
    border-bottom:1px solid rgba(255,255,255,.5);
}

.products-cta-mail:hover,
.products-cta-wa:hover{
    border-bottom-color:#fff;
}

@media(max-width:768px){

    .products-split-row,
    .products-split-row--reverse{
        grid-template-columns:1fr;
        direction:ltr;
        transform:none !important;
        margin-top:0 !important;
    }

    .products-split-stack .products-split-row:nth-child(even) .products-split-media{
        transform:none !important;
    }

    .products-split-stack{
        gap:40px;
    }

    .products-hero-cta{
        flex-direction:column;
    }

}