/* 全局变量，和首页保持统一 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --color-dark-bg: #0f1c30;
    --color-darker: #091220;
    --color-primary-blue: #1677ff;
    --color-blue-light: #42a5ff;
    --color-white: #ffffff;
    --color-gray-light: #f4f7fa;
    --color-text-dark: #222831;
    --color-text-gray: #667080;
    --transition-base: all 0.3s ease;
}
body {
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--color-text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--color-gray-light);
}
ul {
    list-style: none;
}
a {
    text-decoration: none;
    color: inherit;
}
img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display:block;
}
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap:8px;
    padding:12px 24px;
    border-radius:4px;
    font-weight:600;
    font-size:14px;
    transition: var(--transition-base);
    border:none;
    cursor:pointer;
}
.btn-primary {
    background-color: var(--color-primary-blue);
    color: var(--color-white);
}
.btn-primary:hover {
    background-color:#0f64dd;
}
.btn-outline-light {
    background-color: transparent;
    color: var(--color-white);
    border:1px solid rgba(255,255,255,0.4);
}
.btn-outline-light:hover {
    background-color:rgba(255,255,255,0.12);
}
.text-blue {
    color: var(--color-blue-light);
}
.section-label {
    color: var(--color-primary-blue);
    font-size:13px;
    font-weight:600;
    text-transform: uppercase;
    display:block;
    margin-bottom:8px;
}
.section-label.center {
    text-align:center;
}

/* ===== Header 样式 和首页完全一致 ===== */
.site-header {
    position:absolute;
    width:100%;
    top:0;
    left:0;
    z-index:999;
    padding:16px 0;
}
.header-wrap {
    display:flex;
    justify-content: space-between;
    align-items:center;
}
.brand-logo {
    display:flex;
    align-items:center;
    gap:10px;
    color:#fff;
}
.logo-icon {
    font-size:24px;
}
.logo-text strong {
    display:block;
    font-size:18px;
    letter-spacing:1px;
}
.logo-text small {
    font-size:10px;
    opacity:0.8;
}
.main-nav {
    display:flex;
    align-items:center;
    gap:28px;
}
.nav-list {
    display:flex;
    gap:26px;
}
.nav-item a {
    color:#ffffff;
    font-size:14px;
    font-weight:500;
    display:flex;
    align-items:center;
    gap:4px;
}
.nav-item.active a {
    color: var(--color-blue-light);
}
.menu-toggle {
    display:none;
    background:transparent;
    border:none;
    color:#fff;
    font-size:24px;
}

/* About Hero Banner */
.about-hero {
        background-color: var(--color-dark-bg);
    position:relative;
    height:420px;
    display:flex;
    align-items:center;
    padding-top:80px;
}
.about-hero-bg {
    position:absolute;
    inset:0;
    background-image:url('../images/banner.jpg');
    background-size:cover;
    background-position:center;
    opacity:0.58;
    background-color:#0f1c30;
}
.about-hero-content {

    /* margin-left: 0px; */


    
    position:relative;
    z-index:2;
    color:#ffffff;
}
.about-hero-text h1 {
    font-size:54px;
    text-transform:uppercase;
    margin-bottom:10px;
}
.about-sub {
    font-size:17px;
    opacity:0.9;
    margin-bottom:20px;
}
.breadcrumbs {
    font-size:14px;
    opacity:0.75;
}
.breadcrumbs a {
    color:var(--color-blue-light);
}

/* Who We Are */
.who-we-are {
    padding:70px 0;
    background-color:#ffffff;
}
.who-row {
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap:48px;
}
.who-left h2 {
    font-size:28px;
    margin-bottom:18px;
    padding-bottom:10px;
    position:relative;
}
.who-left h2::after {
    content:"";
    width:40px;
    height:2px;
    background-color:var(--color-primary-blue);
    position:absolute;
    left:0;
    bottom:0;
}
.who-left p {
    margin-bottom:16px;
    color:var(--color-text-gray);
}
.who-left .btn {
    margin-top:14px;
}
.stats-4grid {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
}
.stat-card {
    background:#fff;
    box-shadow:0 1px 10px rgba(0,0,0,0.06);
    padding:24px;
    border-radius:4px;
}
.stat-icon {
    color:var(--color-primary-blue);
    font-size:26px;
    margin-bottom:10px;
}
.stat-num {
    font-size:32px;
    font-weight:700;
    margin-bottom:6px;
}
.stat-card h4 {
    font-size:15px;
    margin-bottom:6px;
}
.stat-card p {
    font-size:12px;
    color:var(--color-text-gray);
}

/* Why Choose Us */
.why-choose {
    padding:70px 0;
    background-color:var(--color-gray-light);
}
.why-grid {
    display:grid;
    grid-template-columns: repeat(5, 1fr);
    gap:24px;
    margin-top:30px;
}
.why-card {
    background:#fff;
    padding:26px 20px;
    border-radius:4px;
}
.why-icon {
    color:var(--color-primary-blue);
    font-size:28px;
    margin-bottom:14px;
}
.why-card h4 {
    font-size:15px;
    margin-bottom:8px;
}
.why-card p {
    font-size:13px;
    color:var(--color-text-gray);
}

/* Manufacturing */
.manufacturing {
    padding:70px 0;
    background-color:#ffffff;
}
.manu-row {
    display:grid;
    grid-template-columns: 440px 1fr;
    gap:40px;
}
.manu-left h2 {
    font-size:28px;
    margin-bottom:16px;
}
.manu-left p {
    color:var(--color-text-gray);
    margin-bottom:20px;
}
.manu-list {
    margin-bottom:26px;
}
.manu-list li {
    display:flex;
    align-items:center;
    gap:8px;
    font-size:14px;
    margin-bottom:10px;
}
.manu-list li i {
    color:var(--color-primary-blue);
}
.manu-gallery {
    display:grid;
    grid-template-columns: 2fr 1fr;
    gap:14px;
}
.gallery-main {
    grid-row: 1 / span 3;
}
.gallery-side {
    display:flex;
    flex-direction:column;
    gap:14px;
}
.side-img {
    flex:1;
}

/* Certifications */
.certifications {
    padding:60px 0;
    background-color:#ffffff;
    text-align:center;
}
.cert-title {
    font-size:26px;
    margin-bottom:30px;
}
.cert-logos {
    display:flex;
    justify-content:center;
    align-items:center;
    gap:40px;
    flex-wrap:wrap;
    margin-bottom:16px;
}
.cert-logo-item {
    font-size:24px;
    font-weight:bold;
    opacity:0.85;
}
.cert-desc {
    font-size:13px;
    color:var(--color-text-gray);
}

/* Bottom CTA */
.bottom-cta {
    background-color:var(--color-darker);
    color:#fff;
    padding:50px 0;
}
.cta-inner {
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:30px;
}
.cta-text {
    display:flex;
    align-items:center;
    gap:16px;
}
.cta-shield-icon {
    font-size:40px;
    color:var(--color-blue-light);
}
.cta-text h3 {
    font-size:22px;
    margin-bottom:6px;
}
.cta-text p {
    opacity:0.75;
    font-size:14px;
    max-width:480px;
}
.cta-buttons {
    display:flex;
    gap:16px;
}

/* Footer */
.site-footer {
    background-color:#070e19;
    color:#bbbbbb;
    padding:24px 0;
    font-size:13px;
}

/* ===== 响应式 ===== */
@media(max-width:1024px) {
    .who-row {
        grid-template-columns: 1fr;
    }
    .why-grid {
        grid-template-columns: repeat(3,1fr);
    }
    .manu-row {
        grid-template-columns: 1fr;
    }
}
@media(max-width:768px) {
    .main-nav {
        display:none;
    }
    .menu-toggle {
        display:block;
    }
    .about-hero-text h1 {
        font-size:38px;
    }
    .stats-4grid {
        grid-template-columns:1fr;
    }
    .why-grid {
        grid-template-columns: repeat(2,1fr);
    }
    .manu-gallery {
        grid-template-columns: 1fr;
    }
    .gallery-main {
        grid-row:auto;
    }
    .cta-inner {
        flex-direction:column;
        text-align:center;
    }
    .cta-text {
        flex-direction:column;
    }
    .cta-buttons {
        flex-direction:column;
        width:100%;
    }
}
@media(max-width:480px) {
    .why-grid {
        grid-template-columns: 1fr;
    }
    .cert-logos {
        gap:20px;
    }
}