:root {
    --primary: #0d4c7e;
    --primary-dark: #07253d;
    --accent: #f3a53a;
    --ink: #162230;
    --muted: #617489;
    --line: #d6e0ea;
    --surface: #f4f8fb;
    --white: #fff;
    --container: 1200px;
    --shadow: 0 18px 52px rgba(8, 31, 52, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--white);
    font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
main { min-height: 60vh; }
.container { width: min(var(--container), calc(100% - 32px)); margin: 0 auto; }
.section { padding: 80px 0; }
.section-kicker {
    display: inline-block; margin-bottom: 12px; font-size: 12px; letter-spacing: 0.18em;
    text-transform: uppercase; color: var(--accent);
}
.section-heading { max-width: 760px; margin-bottom: 32px; }
.section-heading.align-center { margin-left: auto; margin-right: auto; text-align: center; }
.section-heading h2, .subpage-hero h1, .hero-copy h1 { margin: 0; line-height: 1.2; }
.section-heading p, .hero-copy p, .subpage-hero p, .product-card p, .rich-page-content p { color: var(--muted); }

.topbar { background: var(--primary-dark); color: rgba(255,255,255,.86); font-size: 13px; }
.topbar-inner, .nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.topbar-inner { min-height: 42px; }
.topbar-contact { display: flex; gap: 18px; flex-wrap: wrap; }
.nav-wrap {
    position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96);
    border-bottom: 1px solid rgba(13, 76, 126, .09); backdrop-filter: blur(8px);
}
.nav-inner { min-height: 82px; }
.brand { display: inline-flex; align-items: center; gap: 14px; }
.brand-mark {
    width: 50px; height: 50px; border-radius: 12px; display: inline-flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--primary), #2177b7); color: var(--white); font-weight: 700; letter-spacing: .08em;
}
.brand-text strong { display: block; font-size: 22px; color: var(--primary-dark); }
.brand-text em { display: block; font-style: normal; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.main-nav { display: flex; align-items: center; gap: 26px; }
.main-nav a { position: relative; padding: 8px 0; font-weight: 600; color: #304357; }
.main-nav a::after {
    content: ""; position: absolute; left: 0; bottom: -4px; width: 100%; height: 2px;
    background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .25s ease;
}
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
.nav-toggle { display: none; width: 42px; height: 42px; padding: 0; border: 0; background: transparent; }
.nav-toggle span { display: block; width: 24px; height: 2px; margin: 5px auto; background: var(--primary-dark); }
.lang-switcher { display: inline-flex; gap: 6px; }
.lang-btn {
    min-width: 40px; height: 36px; border-radius: 999px; border: 1px solid rgba(13,76,126,.18); background: var(--white);
    color: var(--primary-dark); font-weight: 700; cursor: pointer;
}
.lang-btn.is-active { background: var(--primary); color: var(--white); border-color: var(--primary); }

.hero-banner { position: relative; overflow: hidden; background: #0d2740; }
.hero-slides { position: relative; min-height: calc(100vh - 124px); }
.hero-slide { position: absolute; inset: 0; opacity: 0; pointer-events: none; transition: opacity .7s ease; }
.hero-slide.is-active { opacity: 1; pointer-events: auto; }
.hero-video, .hero-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; background-size: cover; background-position: center; }
.hero-shade {
    position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,27,45,.84), rgba(7,27,45,.46));
}
.hero-inner { position: relative; z-index: 1; min-height: calc(100vh - 124px); display: flex; align-items: center; }
.hero-copy { max-width: 720px; color: var(--white); padding: 60px 0 96px; }
.hero-eyebrow {
    display: inline-block; margin-bottom: 22px; padding: 8px 14px; border: 1px solid rgba(255,255,255,.26);
    color: rgba(255,255,255,.86); font-size: 13px; letter-spacing: .12em;
}
.hero-copy h1 { font-size: clamp(36px, 5vw, 66px); margin-bottom: 20px; }
.hero-copy p { max-width: 640px; font-size: 17px; color: rgba(255,255,255,.8); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 32px; }
.hero-dots { position: absolute; left: 50%; bottom: 36px; transform: translateX(-50%); display: flex; gap: 10px; z-index: 2; }
.hero-dot { width: 48px; height: 4px; border: 0; background: rgba(255,255,255,.34); cursor: pointer; }
.hero-dot.is-active { background: var(--accent); }

.btn {
    display: inline-flex; align-items: center; justify-content: center; min-height: 48px; min-width: 148px;
    padding: 0 24px; border-radius: 999px; font-weight: 700; transition: transform .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: var(--white); }
.btn-secondary { border: 1px solid rgba(255,255,255,.32); color: var(--white); }
.page-section .btn-secondary, .news-list-item .btn-secondary { border-color: rgba(13,76,126,.2); color: var(--primary); }

.intro-strip { background: linear-gradient(180deg, #fff, #f5f8fb); }
.intro-grid, .split-grid, .company-story, .contact-layout, .cta-box, .real-detail-grid {
    display: grid; gap: 30px;
}
.intro-grid, .split-grid, .company-story { grid-template-columns: 1.05fr 1fr; }
.intro-metrics, .catalog-summary, .contact-cards, .spec-grid { display: grid; gap: 16px; }
.intro-metrics, .catalog-summary, .spec-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.intro-metrics div, .catalog-summary div, .story-stats div, .contact-cards article, .spec-item {
    background: var(--white); border: 1px solid var(--line); padding: 22px; box-shadow: var(--shadow);
}
.intro-metrics strong, .catalog-summary strong, .story-stats strong { display: block; font-size: 34px; line-height: 1; color: var(--primary); margin-bottom: 6px; }
.intro-link { display: inline-block; margin-top: 22px; color: var(--primary); font-weight: 700; }

.evidence-section, .page-section { background: var(--surface); }
.evidence-grid, .product-grid, .product-gallery { display: grid; gap: 20px; }
.evidence-grid { grid-template-columns: 1.4fr 1fr 1fr; }
.evidence-card { overflow: hidden; min-height: 240px; background: #dce6ef; }
.evidence-card.wide { grid-row: span 2; min-height: 500px; }
.evidence-card img, .gallery-card img, .product-cover, .detail-cover-image { width: 100%; height: 100%; object-fit: cover; }

.product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.category-showcase {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}
.featured-real-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.featured-real-card {
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
    aspect-ratio: 1 / 1;
}
.featured-real-card.wide {
    grid-row: auto;
    aspect-ratio: 1 / 1;
}
.featured-real-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.category-card,
.spec-overview-item {
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.category-card {
    overflow: hidden;
}
.category-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}
.category-card-body {
    padding: 18px 20px 22px;
}
.category-card-body strong {
    display: block;
    margin-bottom: 6px;
    font-size: 20px;
    color: var(--primary-dark);
}
.category-card-body span {
    color: var(--muted);
}
.spec-overview-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
}
.spec-overview-item {
    padding: 16px 12px;
    text-align: center;
    font-weight: 700;
    color: var(--primary-dark);
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}
.spec-overview-item:hover {
    color: var(--white);
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(13, 76, 126, 0.2);
}
.spec-sections {
    display: grid;
    gap: 28px;
}
.spec-section {
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 28px;
}
.spec-section-head {
    margin-bottom: 18px;
}
.spec-section-head h3 {
    margin: 0;
    font-size: 28px;
    color: var(--primary-dark);
}
.spec-color-groups {
    display: grid;
    gap: 24px;
}
.spec-color-group {
    padding-top: 6px;
}
.spec-color-title {
    margin-bottom: 14px;
}
.spec-color-link {
    display: inline-flex;
}
.spec-color-title strong {
    display: inline-flex;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(13,76,126,.08);
    color: var(--primary);
}
.spec-color-link:hover strong {
    background: var(--primary);
    color: var(--white);
}
.spec-color-actions {
    margin-top: 14px;
}
.spec-image-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}
.spec-image-card {
    margin: 0;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--line);
}
.spec-image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.product-card, .gallery-card, .story-main, .story-stats, .contact-panel, .qr-panel, .news-card, .news-list-item, .rich-page-content {
    background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.product-card { overflow: hidden; transition: transform .25s ease, box-shadow .25s ease; }
.product-card:hover { transform: translateY(-6px); }
.product-cover { aspect-ratio: 4 / 3; }
.product-card-body { padding: 22px; }
.product-category {
    display: inline-flex; margin-bottom: 10px; padding: 6px 12px; border-radius: 999px;
    background: rgba(13,76,126,.08); color: var(--primary); font-size: 12px;
}
.product-card h3, .catalog-head h2, .story-main h2, .product-detail-info h2 { margin: 0 0 10px; font-size: 24px; line-height: 1.3; }
.text-link { color: var(--primary); font-weight: 700; }

.application-section { background: linear-gradient(135deg, #0d3c62, #164666); color: var(--white); }
.application-section .section-heading p, .application-points span { color: rgba(255,255,255,.78); }
.application-points { display: grid; gap: 16px; }
.application-points article { padding: 22px 24px; border: 1px solid rgba(255,255,255,.14); background: rgba(255,255,255,.04); }
.application-points strong { display: block; margin-bottom: 6px; }

.subpage-hero {
    position: relative; overflow: hidden; padding: 96px 0 72px; color: var(--white);
    background: linear-gradient(135deg, rgba(10,54,88,.92), rgba(10,54,88,.65));
}
.photo-hero { background-size: cover; background-position: center; }
.subpage-hero .container { position: relative; z-index: 1; }
.subpage-hero p { max-width: 760px; color: rgba(255,255,255,.82); }

.story-main, .contact-panel, .qr-panel, .product-detail-info, .rich-page-content { padding: 32px; }
.story-stats { display: grid; gap: 16px; }
.factory-showcase, .gallery-section, .related-section { margin-top: 34px; }
.contact-layout { grid-template-columns: 1.3fr .8fr; align-items: start; }
.contact-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.contact-cards strong { display: block; margin-bottom: 8px; color: var(--primary-dark); }
.qr-panel { text-align: center; }
.qr-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}
.qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}
.qr-item img {
    max-width: 160px;
    width: 100%;
    height: auto;
    background: #fff;
    padding: 8px;
    border: 1px solid var(--line);
}
.qr-item span {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-dark);
}
.qr-panel p { max-width: 220px; margin: 0 auto; }

.real-detail-grid { grid-template-columns: 1fr 1fr; align-items: stretch; margin-bottom: 28px; }
.product-detail-visual { min-height: 100%; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); overflow: hidden; }
.detail-cover-image { min-height: 100%; }
.spec-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 22px 0 26px; }
.spec-item span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 13px; }
.detail-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.product-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gallery-card { overflow: hidden; aspect-ratio: 4 / 3; }
.is-zoomable {
    cursor: zoom-in;
}
.lightbox-open {
    overflow: hidden;
}
.image-lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 32px;
    background: rgba(7, 24, 38, .84);
}
.image-lightbox.is-open {
    display: flex;
}
.image-lightbox-stage {
    position: relative;
    max-width: min(1200px, 92vw);
    max-height: 88vh;
}
.image-lightbox-img {
    max-width: 100%;
    max-height: 88vh;
    width: auto;
    height: auto;
    object-fit: contain;
    box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
    background: #fff;
}
.image-lightbox-close {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 44px;
    height: 44px;
    border: 0;
    border-radius: 999px;
    background: rgba(255,255,255,.12);
    color: var(--white);
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
}
.image-lightbox-close:hover {
    background: rgba(255,255,255,.22);
}
.spec-page-toolbar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.spec-size-intro {
    margin-bottom: 24px;
}
.spec-color-card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}
.spec-color-route-card {
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.spec-color-route-cover {
    display: block;
}
.spec-color-route-cover img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}
.spec-color-route-body {
    padding: 20px;
}
.spec-color-route-body strong {
    display: block;
    margin-bottom: 8px;
    font-size: 20px;
    color: var(--primary-dark);
}
.spec-color-route-body span {
    display: block;
    margin-bottom: 14px;
    color: var(--muted);
}
.sibling-switcher {
    margin-bottom: 24px;
}
.sibling-chip-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.sibling-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border-radius: 999px;
    border: 1px solid rgba(13,76,126,.18);
    background: var(--white);
    color: var(--primary-dark);
    font-weight: 700;
}
.sibling-chip.is-active,
.sibling-chip:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.cta-section { background: linear-gradient(180deg, #f4f8fb, #fff); padding-top: 0; }
.cta-box {
    grid-template-columns: 1fr auto; align-items: center; padding: 36px 42px;
    background: linear-gradient(135deg, var(--primary), #1f73b2); color: var(--white);
}
.cta-box p, .cta-box h2 { color: var(--white); }
.cta-side { display: grid; gap: 14px; justify-items: center; }
.cta-side img { width: 148px; height: 148px; background: #fff; padding: 10px; }

.news-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.news-card { display: grid; grid-template-columns: 104px 1fr; }
.news-date { background: var(--primary); color: var(--white); display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 16px; }
.news-date strong { font-size: 34px; line-height: 1; }
.news-body { padding: 22px; }
.news-listing { display: grid; gap: 20px; }
.news-list-item { display: grid; grid-template-columns: 80px 1fr auto; gap: 22px; padding: 26px; align-items: center; }
.news-list-index { color: var(--accent); font-size: 28px; font-weight: 700; }
.news-meta { display: inline-block; margin-bottom: 8px; font-size: 13px; color: var(--primary); }

.site-footer { background: #0a2237; color: rgba(255,255,255,.72); }
.footer-grid { display: grid; grid-template-columns: 1.35fr 1fr 1fr 1.1fr; gap: 28px; padding: 64px 0 42px; }
.footer-brand { color: var(--white); font-size: 22px; margin-bottom: 14px; }
.site-footer h4 { margin: 0 0 14px; color: var(--white); }
.footer-links, .footer-contact { list-style: none; margin: 0; padding: 0; }
.footer-links li, .footer-contact li { margin-bottom: 10px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 18px 0; font-size: 13px; }

@media (max-width: 1080px) {
    .intro-grid, .split-grid, .company-story, .contact-layout, .cta-box, .real-detail-grid, .footer-grid { grid-template-columns: 1fr; }
    .product-grid, .news-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .category-showcase { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .featured-real-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .spec-color-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .featured-real-card.wide { grid-row: auto; min-height: 280px; }
    .spec-overview-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .spec-image-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .evidence-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .evidence-card.wide { grid-row: auto; min-height: 280px; }
    .hero-slides, .hero-inner { min-height: 720px; }
}

@media (max-width: 860px) {
    .topbar { display: none; }
    .nav-inner { min-height: 74px; position: relative; }
    .nav-toggle { display: block; }
    .main-nav {
        position: absolute; left: 0; right: 0; top: calc(100% + 1px); display: none; flex-direction: column;
        align-items: flex-start; gap: 0; padding: 10px 0; background: var(--white); box-shadow: 0 12px 28px rgba(7,26,46,.12);
    }
    .main-nav.is-open { display: flex; }
    .main-nav a { width: 100%; padding: 14px 16px; }
    .lang-switcher { margin-left: auto; }
    .hero-slides, .hero-inner { min-height: 620px; }
    .hero-copy { padding: 30px 0 96px; }
    .intro-metrics, .catalog-summary, .product-grid, .product-gallery, .news-grid, .contact-cards, .spec-grid, .category-showcase, .spec-overview-grid, .featured-real-grid, .spec-image-grid, .spec-color-card-grid { grid-template-columns: 1fr; }
    .news-card, .news-list-item { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
    .section { padding: 64px 0; }
    .container { width: min(var(--container), calc(100% - 24px)); }
    .hero-copy h1 { font-size: 32px; }
    .hero-copy p { font-size: 15px; }
    .hero-actions, .detail-actions { flex-direction: column; }
    .btn { width: 100%; }
}