:root {
    --ink: #18212f;
    --muted: #667085;
    --line: #e6ebf1;
    --paper: #ffffff;
    --soft: #f5f8fb;
    --teal: #0e9f9a;
    --teal-dark: #087a78;
    --coral: #ff7a59;
    --blue: #3468f6;
    --shadow: 0 16px 36px rgba(24, 33, 47, 0.10);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    color: var(--ink);
    background: #fbfcfd;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
input, select, textarea, button { font: inherit; }
h1, h2, h3 { letter-spacing: 0; }
h3 { font-size: 18px; }

.img-square,
.square-img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    display: block;
}

.square-wrap,
.square-media {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
}

.square-media {
    border-radius: 8px;
    background: #f3f5f8;
}

.square-wrap img,
.square-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 74px;
    padding: 14px clamp(18px, 5vw, 72px);
    background: rgba(255, 255, 255, 0.93);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 15px; }
.brand img { width: 36px; height: 36px; object-fit: contain; }
.brand-mark {
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    color: #fff;
    background: linear-gradient(135deg, var(--teal), var(--blue));
    text-transform: uppercase;
}
.main-nav { display: flex; align-items: center; gap: 20px; color: #344054; font-size: 14px; font-weight: 650; }
.main-nav a:hover { color: var(--teal-dark); }
.nav-search input {
    width: 180px;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 9px 14px;
    background: #fff;
}
.lang-switch { display: inline-flex; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: #fff; }
.lang-switch a { padding: 6px 10px; border-radius: 999px; font-size: 13px; }
.lang-switch .active { background: var(--ink); color: #fff; }
.nav-toggle { display: none; border: 0; background: var(--soft); border-radius: 8px; padding: 8px 10px; }

.flash-wrap { max-width: 1180px; margin: 16px auto 0; padding: 0 20px; }
.flash { padding: 12px 14px; border-radius: 8px; margin-bottom: 10px; border: 1px solid var(--line); background: #fff; }
.flash.success { border-color: #9ce2ca; background: #effcf6; }
.flash.error { border-color: #ffc1b3; background: #fff3ef; }

.hero-slider { position: relative; overflow: hidden; background: linear-gradient(135deg, #152033, #0e9f9a); }
.hero-slide {
    position: relative;
    display: none;
    align-items: center;
    min-height: 540px;
    padding: 72px clamp(20px, 6vw, 86px);
    background-size: cover;
    background-position: center;
}
.hero-slide::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0.24) 56%, rgba(0, 0, 0, 0.12));
}
.hero-slide.active { display: flex; }
.hero-content {
    position: relative;
    z-index: 2;
    width: min(760px, 100%);
    color: #fff;
}
.hero-content .eyebrow { color: rgba(255, 255, 255, 0.82); }
.hero-content h1 {
    margin: 14px 0 16px;
    font-size: clamp(32px, 4vw, 40px);
    line-height: 1.12;
}
.hero-content p {
    max-width: 660px;
    margin: 0 0 26px;
    color: rgba(255, 255, 255, 0.86);
    font-size: 16px;
}

.eyebrow, .section-head span, .download-cta span, .page-hero span {
    display: inline-flex;
    color: var(--teal-dark);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}
.page-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 430px);
    gap: 32px;
    align-items: center;
    padding: 56px clamp(20px, 6vw, 86px);
    background: linear-gradient(135deg, #f5fbfa, #fff8f4);
}
.page-hero.compact { display: block; text-align: center; }
.page-hero h1 {
    margin: 12px 0 14px;
    max-width: 760px;
    font-size: clamp(28px, 3vw, 32px);
    line-height: 1.16;
}
.page-hero.compact h1 { margin-left: auto; margin-right: auto; }
.page-hero p { max-width: 760px; margin: 0 auto; color: var(--muted); font-size: 15px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 9px 15px;
    font-size: 14px;
    color: var(--ink);
    background: #fff;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(24, 33, 47, 0.12); }
.btn.primary { color: #fff; border-color: var(--teal); background: linear-gradient(135deg, var(--teal), var(--blue)); }
.btn.ghost { color: var(--teal-dark); border-color: #bde7e2; background: #f1fbf9; }
.btn.light { color: var(--ink); background: #fff; border-color: rgba(255, 255, 255, 0.52); }
.btn.small { padding: 7px 11px; font-size: 13px; }

.section { max-width: 1220px; margin: 0 auto; padding: 56px 20px; }
.section-head { margin-bottom: 22px; }
.section-head h2, .split h2, .download-cta h2 {
    margin: 8px 0 0;
    font-size: clamp(22px, 2.5vw, 26px);
    line-height: 1.15;
}
.soft-band { max-width: none; padding-left: clamp(20px, 6vw, 86px); padding-right: clamp(20px, 6vw, 86px); background: var(--soft); }
.soft-band > * { max-width: 1220px; margin-left: auto; margin-right: auto; }

.category-grid, .product-grid, .feature-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
}
.category-card {
    display: block;
    padding: 0;
    color: var(--ink);
    background: transparent;
    border: 0;
    box-shadow: none;
}
.category-card:hover .category-img { transform: translateY(-2px); box-shadow: var(--shadow); }
.category-img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    display: block;
    border-radius: 8px;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.category-name {
    margin-top: 10px;
    text-align: center;
    font-size: 15px;
    font-weight: 750;
}

.product-card {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
    box-shadow: 0 10px 24px rgba(24, 33, 47, 0.05);
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.product-image {
    display: block;
    border-radius: 0;
    background: transparent;
}
.product-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
.product-body { padding: 14px; }
.product-body > span { color: var(--teal-dark); font-size: 13px; font-weight: 800; }
.product-body h3 { margin: 8px 0 8px; font-size: 16px; line-height: 1.28; }
.product-body p { margin: 0; color: var(--muted); font-size: 14px; }
.card-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.muted, .empty { color: var(--muted); }

.split {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 36px;
    align-items: center;
}
.split p { color: var(--muted); font-size: 15px; }
.advantage-list { display: grid; gap: 12px; }
.advantage-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 18px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: #fff;
}
.advantage-item span { color: var(--teal); font-weight: 900; }
.download-cta {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: center;
    max-width: 1180px;
    margin: 36px auto 80px;
    padding: 34px;
    border-radius: 8px;
    color: #fff;
    background: linear-gradient(135deg, #0e9f9a, #3468f6 60%, #ff7a59);
}
.download-cta span, .download-cta p { color: rgba(255, 255, 255, 0.88); }

.filter-bar {
    display: grid;
    grid-template-columns: 1.1fr 1fr 1fr auto;
    gap: 12px;
    margin-bottom: 28px;
}
.filter-bar.centered { max-width: 760px; margin: 20px auto 0; grid-template-columns: 1fr auto; }
.filter-bar input, .filter-bar select, .contact-form input, .contact-form textarea {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    background: #fff;
}

.product-detail {
    display: grid;
    grid-template-columns: minmax(0, 0.98fr) minmax(320px, 1.02fr);
    gap: 44px;
    max-width: 1220px;
    margin: 0 auto;
    padding: 58px 20px 44px;
}
.product-cover { border-radius: 8px; border: 1px solid var(--line); background: transparent; }
.gallery-main { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
.thumb-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-top: 12px; }
.thumb-row button { border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 5px; cursor: pointer; }
.thumb-row img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 6px; }
.product-info h1 { margin: 12px 0; font-size: clamp(24px, 3vw, 28px); line-height: 1.16; }
.lead { color: var(--muted); font-size: 15px; }
.spec-list { display: grid; gap: 0; margin: 24px 0; }
.spec-list div { display: grid; grid-template-columns: 140px 1fr; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.spec-list dt { color: var(--muted); font-weight: 800; }
.spec-list dd { margin: 0; }
.detail-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.color-options { margin-top: 22px; }
.color-options h2 { margin: 0 0 10px; font-size: 18px; }
.color-option-list { display: flex; flex-wrap: wrap; gap: 10px; }
.color-option {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    padding: 7px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
    font-size: 14px;
    font-weight: 700;
}
.color-thumb,
.color-swatch {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    border: 1px solid var(--line);
}
.color-thumb { object-fit: cover; }
.color-swatch { display: inline-block; }

.ecommerce-details { padding-top: 22px; }
.ecommerce-detail-list { display: grid; gap: 28px; }
.ecommerce-detail-block {
    display: grid;
    gap: 16px;
    max-width: 860px;
    margin: 0 auto;
}
.ecommerce-detail-copy {
    padding: 0 4px;
    text-align: left;
}
.ecommerce-detail-copy h3 {
    margin: 0 0 8px;
    font-size: 20px;
    line-height: 1.25;
}
.ecommerce-detail-copy p {
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 15px;
}
.ecommerce-detail-image { border-radius: 8px; background: transparent; }

.about-section { max-width: 1220px; }
.about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
}
.about-copy h1 { margin: 12px 0 18px; font-size: clamp(28px, 3vw, 32px); line-height: 1.16; }
.about-copy p { color: var(--muted); font-size: 15px; }
.about-image {
    width: 100%;
    min-height: 420px;
    max-height: 560px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.contact-layout {
    display: grid;
    grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
    gap: 28px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 64px 20px 34px;
}
.contact-card, .contact-form {
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 12px 30px rgba(24, 33, 47, 0.06);
}
.contact-card h2 { margin-top: 0; font-size: 22px; }
.contact-form { display: grid; gap: 14px; }
.contact-form label { display: grid; gap: 6px; color: var(--muted); font-weight: 750; }
.contact-wechat-box {
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid #edf0f5;
    display: flex;
    align-items: center;
    gap: 16px;
}
.wechat-qr-img {
    width: 138px;
    height: 138px;
    object-fit: cover;
    border-radius: 12px;
    background: #fff;
    border: 1px solid #e6e9ef;
}
.wechat-text strong {
    font-size: 15px;
    font-weight: 750;
}
.wechat-text p {
    margin: 6px 0 0;
    font-size: 13px;
    color: var(--muted);
    line-height: 1.5;
}

.not-found { min-height: 54vh; display: grid; place-items: center; align-content: center; gap: 12px; text-align: center; padding: 80px 20px; }
.not-found span { font-size: 56px; font-weight: 900; color: var(--teal); }

.site-footer { padding: 42px clamp(20px, 6vw, 86px) 22px; color: #d8e1e7; background: #18212f; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; max-width: 1220px; margin: 0 auto; }
.footer-grid h3, .footer-grid h4 { color: #fff; margin-top: 0; }
.footer-grid a, .footer-grid p { display: block; color: #b8c4ce; margin: 7px 0; }
.record-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    max-width: 1220px;
    margin: 32px auto 0;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    color: #b8c4ce;
    font-size: 13px;
}
.police-record { display: inline-flex; align-items: center; gap: 6px; }
.police-record img { width: 16px; height: 16px; }

@media (max-width: 980px) {
    .nav-toggle { display: inline-flex; }
    .main-nav {
        position: absolute;
        inset: 74px 14px auto;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: #fff;
        box-shadow: var(--shadow);
    }
    .main-nav.open { display: flex; }
    .nav-search input { width: 100%; }
    .product-detail, .split, .contact-layout, .about-layout { grid-template-columns: 1fr; }
    .category-grid, .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .filter-bar { grid-template-columns: 1fr; }
    .download-cta { flex-direction: column; align-items: flex-start; margin-left: 20px; margin-right: 20px; }
    .footer-grid { grid-template-columns: 1fr; }
    .about-image { min-height: 320px; }
}

@media (max-width: 620px) {
    body { font-size: 14px; }
    .site-header { min-height: 66px; padding: 12px 16px; }
    .main-nav { inset: 66px 14px auto; }
    .hero-slide { min-height: 400px; padding: 54px 20px; }
    .hero-content h1 { font-size: 28px; }
    .hero-content p { font-size: 15px; }
    .category-grid, .product-grid, .feature-grid { grid-template-columns: 1fr; }
    .thumb-row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .spec-list div { grid-template-columns: 1fr; gap: 4px; }
    .section { padding: 46px 16px; }
    .page-hero { padding: 46px 18px; }
    .page-hero h1, .about-copy h1 { font-size: 26px; }
    .section-head h2, .split h2, .download-cta h2 { font-size: 22px; }
    .product-info h1 { font-size: 24px; }
    .ecommerce-detail-copy h3 { font-size: 18px; }
    .download-cta { padding: 28px; }
    .contact-wechat-box { align-items: flex-start; }
    .wechat-qr-img { width: 120px; height: 120px; }
}

.product-detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(340px, 1.05fr);
    gap: 44px;
    max-width: 1220px;
    margin: 0 auto;
    padding: 58px 20px 34px;
}

.product-main-image-wrap {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.product-main-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.product-thumb-row-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
}

.product-thumb-row {
    display: flex;
    flex: 1;
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    scroll-behavior: smooth;
    scrollbar-width: thin;
}

.product-thumb-row.single {
    margin-top: 12px;
}

.product-thumb {
    width: 72px;
    height: 72px;
    flex: 0 0 72px;
    padding: 0;
    border: 1px solid #d6dde6;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    overflow: hidden;
}

.product-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-thumb.active {
    border-color: #e60023;
    box-shadow: 0 0 0 1px #e60023;
}

.thumb-arrow {
    width: 32px;
    height: 72px;
    flex: 0 0 32px;
    border: 0;
    border-radius: 4px;
    color: #fff;
    background: rgba(24, 33, 47, 0.56);
    cursor: pointer;
    font-size: 24px;
    line-height: 1;
}

.product-option-row {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
    margin-top: 22px;
}

.product-option-label {
    padding-top: 9px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 800;
}

.product-option-row .color-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0;
}

.product-option-row .color-option {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    padding: 6px 12px;
    border: 1px solid #d6dde6;
    border-radius: 4px;
    color: var(--ink);
    background: #fff;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
}

.product-option-row .color-option img {
    width: 28px;
    height: 28px;
    object-fit: cover;
    border-radius: 4px;
    border: 1px solid var(--line);
}

.product-option-row .color-option.active {
    border-color: #e60023;
    color: #e60023;
    box-shadow: inset 0 0 0 1px #e60023;
}

.product-description-section {
    margin-top: 18px;
    padding-top: 0;
    background: #fff;
}

.product-description-title {
    margin: 0 0 24px;
    padding: 18px 20px;
    border-radius: 8px;
    background: #f6f7f9;
    font-size: 23px;
    line-height: 1.25;
}

.product-rich-content {
    max-width: 1060px;
    margin: 0 auto;
    color: #222;
    font-size: 15px;
    line-height: 1.7;
}

.product-rich-content p {
    margin: 0 0 14px;
}

.product-rich-content h1,
.product-rich-content h2,
.product-rich-content h3 {
    margin: 24px 0 12px;
    font-size: 22px;
    line-height: 1.3;
}

.product-rich-content h3 {
    font-size: 19px;
}

.product-rich-content ul,
.product-rich-content ol {
    margin: 12px 0 16px 24px;
    padding: 0;
}

.product-rich-content li {
    margin: 5px 0;
}

.product-rich-content a {
    color: var(--teal);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.product-rich-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.product-rich-content .image-only,
.product-rich-content p:has(img) {
    margin: 0;
    padding: 0;
    line-height: 0;
}

.product-rich-content .image-only + .image-only,
.product-rich-content p:has(img) + p:has(img) {
    margin-top: 0;
}

@media (max-width: 980px) {
    .product-detail-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .product-detail-layout {
        padding: 42px 16px 24px;
    }
    .product-option-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    .product-option-label {
        padding-top: 0;
    }
    .product-thumb {
        width: 64px;
        height: 64px;
        flex-basis: 64px;
    }
    .thumb-arrow {
        height: 64px;
    }
    .product-description-title {
        font-size: 22px;
    }
}