:root {
  color-scheme: light;
  --navy: #0a2437;
  --blue: #123f60;
  --accent: #087db9;
  --light: #f1f5f7;
  --ink: #173a50;
  --muted: #5c7382;
  --pale: #b3c9d7;
  --white: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  font-synthesis: none;
  color: var(--ink);
  background: var(--navy);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; font-size: 18px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
body.dialog-open { overflow: hidden; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; text-decoration: none; }
button, a, dialog { touch-action: manipulation; }
button { cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p, figure { margin: 0; }
button:focus-visible, a:focus-visible { outline: 3px solid #42b5ed; outline-offset: 6px; }
.container { width: min(89%, 1440px); margin-inline: auto; }
.skip-link { position: fixed; z-index: 20; top: 12px; left: 12px; padding: 10px 20px; color: var(--white); background: var(--blue); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.site-header { color: var(--white); }
.header-inner { display: flex; align-items: center; gap: 32px; min-height: 114px; border-bottom: 1px solid #29495f; }
.brand { display: flex; align-items: center; gap: 20px; margin-right: auto; flex-shrink: 0; }
.logo-tile { display: grid; place-items: center; width: 117px; height: 63px; background: var(--white); border-radius: 2px; padding: 6px 7px; }
.brand-copy { display: flex; flex-direction: column; gap: 4px; }
.company-name { font-size: clamp(18px, 1.73vw, 28px); font-weight: 600; line-height: 1.35; }
.company-short { display: none; }
.company-english { font-size: 12px; color: var(--pale); line-height: 1.5; }
.main-nav { display: flex; align-items: center; gap: clamp(24px, 3.8vw, 64px); font-size: 19px; color: #d4e2eb; white-space: nowrap; }
.main-nav a:hover { color: var(--white); }
.button { display: inline-flex; justify-content: space-between; align-items: center; gap: 24px; background: var(--accent); color: var(--white); border: 1px solid transparent; border-radius: 3px; min-height: 64px; padding: 14px 22px; font-size: 21px; line-height: 1.4; }
.button:hover { background: #096fa2; }
.arrow { display: inline-block; font-family: Arial, sans-serif; font-size: 32px; line-height: 1; font-weight: 400; }
.header-contact { min-height: 58px; margin-left: 12px; padding-inline: 20px; font-size: 19px; white-space: nowrap; }
.hero { color: var(--white); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 46% 54%; align-items: center; min-height: 770px; padding-block: 92px 65px; }
.hero-copy { position: relative; z-index: 1; }
.hero h1 { font-weight: 600; font-size: clamp(40px, 4.4vw, 71px); line-height: 1.42; letter-spacing: -.035em; white-space: nowrap; }
.hero h1 span { display: block; }
.hero-description { font-size: clamp(15px, 1.28vw, 21px); color: var(--pale); margin-top: 46px; line-height: 2.1; }
.hero-description span { display: block; white-space: nowrap; }
.hero-description .hero-description-mobile, .mobile-button-label, .mobile-detail-heading { display: none; }
.hero-contact { margin-top: 49px; width: 285px; min-height: 72px; font-size: 23px; }
.hero-qr { display: flex; align-items: center; gap: 21px; margin-top: 48px; }
.hero-qr > a { display: block; flex: 0 0 116px; padding: 6px; background: var(--white); }
.hero-qr p { font-size: 21px; margin-bottom: 10px; }
.hero-qr span { font-size: 18px; color: var(--pale); }
.hero-product { position: relative; align-self: center; margin-top: 16px; margin-left: 2px; }
.hero-product::before { content: ""; position: absolute; z-index: 0; width: 790px; height: 790px; top: -115px; left: 95px; border: 68px solid #133a53; border-radius: 50%; pointer-events: none; }
.hero-product::after { content: ""; position: absolute; z-index: 0; width: 665px; height: 665px; top: -53px; left: 157px; border: 1px solid #20465d; border-radius: 50%; pointer-events: none; }
.hero-product::before, .hero-product::after { clip-path: inset(0 0 43% 0); }
.hero-product-image { position: relative; z-index: 1; }
.hero-product-image img { width: 100%; filter: drop-shadow(3px 16px 15px #00000024); }
.hero-product figcaption { position: relative; z-index: 1; padding: 30px 0 0 23%; }
.hero-product figcaption p { font-size: 23px; }
.hero-product figcaption span { display: block; margin-top: 10px; font-size: 17px; color: var(--pale); }
.featured { position: relative; z-index: 1; color: var(--white); background: var(--navy); padding-bottom: 48px; }
.details-heading { display: flex; align-items: baseline; justify-content: space-between; border-top: 1px solid #36556b; padding-top: 30px; margin-bottom: 32px; }
.details-heading h2 { font-size: 26px; }
.details-heading p { font-size: 18px; color: var(--pale); }
.detail-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.detail-photo { display: block; width: 100%; padding: 0; border: 0; background: transparent; }
.detail-photo img { width: 100%; aspect-ratio: 1.52; object-fit: cover; }
.detail-grid figcaption { margin-top: 14px; color: #d1e0e9; font-size: 20px; }
.products { padding-block: 68px 82px; background: var(--light); }
.section-heading h2 { font-size: 40px; line-height: 1.5; color: var(--blue); font-weight: 600; letter-spacing: -.02em; }
.section-heading p { margin-top: 14px; font-size: 21px; color: var(--muted); }
.featured .section-heading h2 { font-size: 26px; color: var(--white); }
.featured .section-heading p { margin-top: 0; color: var(--pale); font-size: 18px; }
.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px; margin-top: 48px; }
.product-image { display: flex; align-items: center; justify-content: center; height: 300px; padding: 18px 28px; background: #e7eff3; }
.product-image img { object-fit: contain; max-height: 100%; max-width: 100%; width: auto; filter: drop-shadow(3px 12px 12px #0000001a); }
.product-copy { padding-top: 22px; }
.product h3 { font-size: 25px; font-weight: 600; color: var(--blue); line-height: 1.5; }
.product p { margin-top: 13px; font-size: 18px; color: var(--muted); }
.categories { padding-block: 62px 49px; background: var(--white); }
.category-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-template-rows: repeat(5, auto); grid-auto-flow: column; column-gap: 30px; row-gap: 22px; list-style: none; padding: 0; margin: 46px 0 34px; }
.category-list li { position: relative; padding-left: 20px; font-size: 22px; }
.category-list li:nth-child(5n + 1)::after { content: ""; position: absolute; top: -22px; left: 0; right: 0; height: 1px; background: #c9d9e2; }
.category-list li::before { content: ""; position: absolute; width: 4px; height: 4px; top: .75em; left: 0; background: #2684b6; }
.category-note { font-size: 20px; color: var(--muted); }
.mobile-category-heading, .mobile-category-note { display: none; }
.contact { padding-block: 65px 70px; color: var(--white); }
.contact-grid { display: grid; grid-template-columns: 1fr 400px; align-items: center; gap: 70px; }
.contact h2 { font-size: 53px; line-height: 1.5; font-weight: 600; letter-spacing: -.02em; }
.contact h2 span { display: block; }
.contact-description { color: #c4d7e3; font-size: 23px; margin-top: 42px; }
.phone-numbers { display: grid; gap: 8px; color: #c4d7e3; font-size: 23px; margin-top: 14px; }
.phone-numbers a, .mobile-phone-numbers a, .dialog-phone a { white-space: nowrap; }
.phone-numbers a:hover, .mobile-phone-numbers a:hover, .dialog-phone a:hover { text-decoration: underline; text-underline-offset: 5px; }
.contact-qr { justify-self: center; text-align: center; }
.contact-qr > a { display: block; width: 338px; padding: 15px; background: var(--white); border-radius: 3px; }
.contact-qr figcaption { margin-top: 18px; font-size: 21px; color: #d4e2ec; }
.mobile-qr-hint, .mobile-phone-numbers { display: none; }
.site-footer { color: #d1e0e9; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; border-top: 1px solid #36556b; padding-block: 28px; font-size: 18px; }
.footer-inner p:last-child { color: var(--pale); }
.icp-link { display: inline-block; margin-top: 10px; color: #d1e0e9; font-size: 14px; text-underline-offset: 4px; }
.mobile-contact-bar { display: none; }
dialog { border: 0; border-radius: 6px; color: var(--ink); background: var(--white); padding: 0; max-height: calc(100dvh - 32px); overscroll-behavior: contain; box-shadow: 0 20px 100px #00000040; }
dialog::backdrop { background: #041522d9; }
.wechat-dialog { width: min(440px, calc(100% - 32px)); max-height: calc(100dvh - 32px); overflow-y: auto; padding: 34px 30px 25px; text-align: center; }
.dialog-close { display: grid; place-items: center; position: absolute; right: 8px; top: 8px; width: 42px; height: 42px; padding: 0; border: 0; background: transparent; color: var(--muted); font-size: 31px; line-height: 1; border-radius: 3px; }
.dialog-close:hover { color: var(--blue); background: var(--light); }
.wechat-dialog h2 { font-size: 25px; font-weight: 600; margin-top: 8px; }
.dialog-intro { font-size: 16px; color: var(--muted); margin-top: 6px; }
.dialog-qr { width: min(100%, 290px); margin: 18px auto; }
#wechat-instructions { font-size: 15px; line-height: 1.8; color: var(--muted); }
.save-qr { display: flex; margin-top: 22px; min-height: 52px; font-size: 17px; }
.save-qr .arrow { font-size: 25px; }
.dialog-phone { margin-top: 15px; font-size: 15px; line-height: 1.9; color: var(--muted); }
.image-dialog { width: min(1120px, calc(100% - 32px)); overflow: auto; background: var(--light); }
.image-dialog-heading { position: relative; padding: 18px 60px 18px 24px; }
.image-dialog h2 { font-size: 22px; font-weight: 600; }
.image-dialog .dialog-close { top: 15px; right: 13px; }
.expanded-image { width: 100%; height: auto; max-height: calc(100dvh - 120px); object-fit: contain; background: #e7eff3; }

@media (min-width: 1650px) {
  .hero-grid { min-height: 770px; }
}

@media (max-width: 1199px) {
  .header-inner { gap: 22px; min-height: 100px; }
  .logo-tile { width: 90px; height: 52px; }
  .brand { gap: 13px; }
  .main-nav { font-size: 16px; gap: 22px; }
  .header-contact { font-size: 16px; min-height: 50px; margin-left: 0; gap: 15px; padding-inline: 15px; }
  .hero-grid { min-height: 670px; padding-block: 72px 55px; }
  .hero h1 { font-size: clamp(36px, 4.35vw, 52px); }
  .hero-description { font-size: 14px; margin-top: 30px; }
  .hero-contact { margin-top: 35px; min-height: 62px; width: 245px; font-size: 20px; }
  .hero-qr { margin-top: 35px; gap: 16px; }
  .hero-qr > a { flex-basis: 95px; }
  .hero-qr p { font-size: 18px; }
  .hero-qr span { font-size: 15px; }
  .hero-product figcaption { padding-left: 18%; }
  .hero-product figcaption p { font-size: 20px; }
  .hero-product::before { width: 640px; height: 640px; left: 60px; top: -125px; border-width: 55px; }
  .hero-product::after { width: 535px; height: 535px; left: 112px; top: -73px; }
  .section-heading h2 { font-size: 34px; }
  .product-image { height: 250px; padding: 20px; }
  .product h3 { font-size: 21px; }
  .product p { font-size: 16px; }
  .category-list li { font-size: 20px; }
  .contact h2 { font-size: 43px; }
  .contact-grid { grid-template-columns: 1fr 320px; gap: 35px; }
  .contact-qr > a { width: 285px; }
  .contact-description, .phone-numbers { font-size: 20px; }
  .footer-inner { font-size: 16px; }
}

@media (min-width: 768px) and (max-width: 959px) {
  .main-nav { display: none; }
  .company-name { font-size: 23px; }
  .hero-grid { grid-template-columns: 48% 52%; }
  .hero-description span:first-child { white-space: normal; max-width: 320px; }
  .hero-product figcaption { padding-left: 13%; }
  .hero-product figcaption p { font-size: 18px; }
  .product-grid { gap: 20px; }
  .product-image { height: 215px; padding: 18px; }
  .product h3 { font-size: 18px; }
  .product p { font-size: 14px; }
  .category-list li { font-size: 17px; }
  .contact-grid { grid-template-columns: 1fr 270px; gap: 25px; }
  .contact-qr > a { width: 250px; }
}

@media (max-width: 767px) {
  html { scroll-padding-top: 18px; scroll-padding-bottom: calc(90px + env(safe-area-inset-bottom)); }
  body { font-size: 16px; }
  .container { width: 89%; }
  .header-inner { min-height: 81px; gap: 14px; }
  .brand { gap: 13px; min-width: 0; }
  .logo-tile { width: 79px; height: 43px; padding: 4px; }
  .brand-copy { gap: 0; }
  .company-name, .company-english, .main-nav { display: none; }
  .company-short { display: block; font-size: 21px; font-weight: 600; white-space: nowrap; }
  .header-contact { margin-left: auto; min-height: 44px; padding: 8px 0 8px 10px; border: 0; background: transparent; font-size: 16px; color: #c2d9e8; white-space: nowrap; }
  .header-contact:hover { background: transparent; color: var(--white); }
  .header-contact .arrow { display: none; }
  .hero-grid { display: flex; flex-direction: column; align-items: stretch; min-height: 0; padding-block: 44px 35px; }
  .hero-copy { display: contents; }
  .hero h1 { order: 0; font-size: clamp(30px, 8.35vw, 49px); line-height: 1.42; letter-spacing: -.035em; }
  .hero-description { order: 1; margin-top: 27px; font-size: clamp(13px, 3.7vw, 19px); line-height: 1.85; }
  .hero-description span { white-space: normal; }
  .hero-description .hero-description-desktop, .desktop-button-label, .desktop-detail-heading { display: none; }
  .hero-description .hero-description-mobile, .mobile-button-label, .mobile-detail-heading { display: block; }
  .hero-product { order: 2; margin: 32px -8px 0; align-self: stretch; }
  .hero-product::before, .hero-product::after { display: none; }
  .hero-product-image { min-height: 180px; display: flex; align-items: center; }
  .hero-product-image img { width: 100%; }
  .hero-product figcaption { padding: 25px 8px 0; }
  .hero-product figcaption p { font-size: 22px; font-weight: 600; }
  .hero-product figcaption span { margin-top: 9px; font-size: 16px; }
  .hero-contact { order: 3; margin-top: 34px; width: 100%; min-height: 63px; font-size: 21px; padding-inline: 20px; }
  .hero-contact::after { content: "将产品型号、数量或需求发给我们。"; position: absolute; top: calc(100% + 16px); left: 0; font-size: 16px; line-height: 1.7; color: var(--pale); }
  .hero-contact { position: relative; margin-bottom: 42px; }
  .hero-qr { display: none; }
  .featured { padding-bottom: 34px; }
  .details-heading { padding-top: 25px; margin-bottom: 26px; }
  .featured .section-heading h2 { font-size: 23px; }
  .featured .section-heading p { display: none; }
  .detail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 25px 14px; }
  .detail-photo img { aspect-ratio: 1.46; }
  .detail-grid figcaption { font-size: 17px; margin-top: 10px; }
  .products { padding-block: 39px 44px; }
  .section-heading h2 { font-size: 28px; }
  .products .section-heading > p { display: none; }
  .product-grid { display: grid; grid-template-columns: 1fr; gap: 30px; margin-top: 34px; }
  .product { display: grid; grid-template-columns: 40% 1fr; gap: 21px; align-items: center; }
  .product-image { height: 155px; padding: 10px; background: #e1ebf1; }
  .product-copy { padding: 0; }
  .product h3 { font-size: clamp(16px, 3.9vw, 22px); white-space: nowrap; }
  .product p { display: none; }
  .categories { padding-block: 37px 33px; }
  .desktop-category-heading, .desktop-category-note, .categories .section-heading p { display: none; }
  .mobile-category-heading, .mobile-category-note { display: inline; }
  .category-list { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-template-rows: none; grid-auto-flow: row; gap: 0 20px; margin: 28px 0 28px; }
  .category-list li { font-size: clamp(12px, 3.3vw, 18px); padding: 12px 0; border-bottom: 1px solid #dfe7ec; line-height: 1.6; white-space: nowrap; }
  .category-list li::before, .category-list li:nth-child(5n + 1)::after { display: none; }
  .category-note { font-size: 17px; }
  .contact { padding-block: 36px 0; }
  .contact-grid { display: flex; flex-direction: column; gap: 0; align-items: stretch; }
  .contact h2 { font-size: clamp(22px, 5.65vw, 34px); line-height: 1.5; white-space: nowrap; }
  .contact h2 span { display: inline; }
  .contact h2 span:last-child { font-size: 0; }
  .contact h2 span:last-child::after { content: "发给蒙崎。"; font-size: clamp(22px, 5.65vw, 34px); }
  .contact-description, .phone-numbers { display: none; }
  .contact-qr { margin-top: 33px; align-self: center; }
  .contact-qr > a { width: min(260px, 65vw); padding: 10px; }
  .contact-qr figcaption { font-size: 21px; margin-top: 16px; }
  .mobile-qr-hint { display: block; font-size: 17px; color: var(--pale); text-align: left; line-height: 1.85; margin-top: 19px; }
  .mobile-phone-numbers { display: block; margin-top: 28px; font-size: clamp(12px, 3.15vw, 17px); color: var(--pale); }
  .footer-inner { display: block; border: 0; padding-block: 15px 30px; font-size: 16px; color: var(--pale); }
  .footer-inner > p:last-child { display: none; }
  .site-footer { padding-bottom: calc(76px + env(safe-area-inset-bottom)); }
  .mobile-contact-bar { display: grid; grid-template-columns: 41% 59%; position: fixed; z-index: 5; bottom: 0; left: 0; right: 0; background: var(--blue); color: var(--white); padding: 16px 0 calc(16px + env(safe-area-inset-bottom)); box-shadow: 0 -1px 0 #ffffff0d; }
  .mobile-contact-bar a { display: flex; align-items: center; justify-content: center; min-height: 36px; font-size: 20px; }
  .mobile-contact-bar a + a { border-left: 1px solid #50768d; }
  .wechat-dialog { padding: 30px 22px 22px; }
  .wechat-dialog h2 { font-size: 23px; }
  .dialog-qr { width: min(100%, 265px); margin-block: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* 品牌信息与静态内容页 */
.hero h1 { font-size: clamp(23px, 2.35vw, 38px); line-height: 1.5; letter-spacing: 0; white-space: normal; }
.hero-slogan { margin-top: 20px; font-weight: 600; font-size: clamp(35px, 4vw, 65px); line-height: 1.42; letter-spacing: -.035em; }
.hero-slogan span { display: block; }
.hero-description { margin-top: 28px; }
.company-intro { background: var(--white); padding-block: 60px; }
.company-intro p { max-width: 960px; margin-top: 20px; color: var(--muted); line-height: 1.9; }
.text-link { display: inline-block; margin-top: 20px; color: var(--accent); text-decoration: underline; text-underline-offset: 5px; }
.product h3 a { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 6px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 12px; font-size: 15px; }
.content-page { background: var(--light); padding-block: 32px 70px; min-height: 70vh; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 15px; color: var(--muted); margin-bottom: 28px; }
.breadcrumb a { text-decoration: underline; text-underline-offset: 4px; }
.page-heading { max-width: 1040px; margin-bottom: 32px; }
.page-heading h1 { font-size: clamp(28px, 4vw, 48px); line-height: 1.4; color: var(--blue); }
.page-heading p { max-width: 850px; margin-top: 18px; color: var(--muted); }
.content-body { display: grid; gap: 28px; }
.content-section { padding: clamp(22px, 3vw, 40px); background: var(--white); border: 1px solid #dce6ec; border-radius: 4px; }
.content-section h2 { font-size: clamp(23px, 2.6vw, 30px); color: var(--blue); margin-bottom: 20px; }
.content-section h3 { font-size: 21px; margin-block: 22px 12px; }
.content-section p + p { margin-top: 16px; }
.content-section li { margin-block: 10px; }
.content-section a:not(.button) { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
.content-section .button { margin-top: 20px; }
.product-overview { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 35px; align-items: center; }
.product-overview figure img { width: 100%; max-height: 460px; object-fit: contain; }
.product-overview figcaption { color: var(--muted); font-size: 15px; margin-top: 14px; text-align: center; }
.spec-list { margin: 0; }
.spec-list div { display: grid; grid-template-columns: minmax(110px, 35%) 1fr; gap: 16px; border-bottom: 1px solid #dae5ec; padding-block: 13px; }
.spec-list dt { color: var(--muted); }
.spec-list dd { margin: 0; overflow-wrap: anywhere; }
.content-note { font-size: 16px; color: var(--muted); margin-top: 20px; }
.page-qr { max-width: 250px; padding: 12px; background: white; border: 1px solid #dce6ec; }
.related-links { display: flex; flex-wrap: wrap; gap: 16px 28px; }
@media(max-width: 767px) {
  .hero h1 { font-size: clamp(22px, 5.7vw, 31px); }
  .hero-slogan { order: 0; font-size: clamp(29px, 8vw, 45px); margin-top: 18px; }
  .hero-description { margin-top: 23px; }
  .company-intro { padding-block: 36px; }
  .company-intro p { font-size: 16px; }
  .content-page { padding-block: 24px 40px; }
  .content-section ul { padding-left: 20px; }
  .product-overview { grid-template-columns: 1fr; gap: 24px; }
  .product-overview figure img { max-height: 320px; }
  .page-heading h1 { font-size: 29px; }
  .page-heading p { font-size: 16px; }
  .spec-list div { grid-template-columns: 105px minmax(0, 1fr); gap: 12px; font-size: 15px; }
}