:root {
  --navy: #0a2855;
  --blue: #1556a5;
  --sky: #eaf5ff;
  --red: #b72b2d;
  --gold: #d0a15f;
  --ink: #10243b;
  --muted: #5d6b7b;
  --line: #dbe5ef;
  --paper: #ffffff;
  --soft: #f5f9fc;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--paper); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.shell { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: flex; align-items: center; gap: 11px; }
.brand img { width: 47px; height: 54px; object-fit: contain; }
.brand span { display: grid; gap: 2px; }
.brand strong { color: var(--navy); font-size: 23px; letter-spacing: 0; }
.brand small { color: var(--gold); font-size: 10px; }
.main-nav { display: flex; align-items: center; gap: 28px; color: #3a4a5b; font-size: 15px; }
.main-nav a:hover { color: var(--blue); }
.nav-action { padding: 11px 16px; color: white !important; background: var(--navy); }
.menu-toggle { display: none; width: 42px; height: 42px; border: 0; background: transparent; padding: 10px; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--navy); }
.hero { position: relative; overflow: hidden; color: #fff; background: #071a32; }
.hero-grid { position: relative; z-index: 2; min-height: 650px; display: flex; align-items: center; padding: 56px 0; }
.hero-copy { max-width: 610px; padding: 32px 0; }
.eyebrow, .section-kicker { margin: 0 0 16px; color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: 2px; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 620px; margin-bottom: 22px; color: var(--navy); font-size: clamp(42px, 5vw, 68px); line-height: 1.12; font-weight: 800; letter-spacing: 0; }
.hero .eyebrow { color: #b9d8ff; }
.hero h1 { color: #fff; text-shadow: 0 2px 18px rgba(0,0,0,.18); }
.hero-description { max-width: 620px; color: #d9e7f5; font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; gap: 14px; margin: 34px 0; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 0 22px; border: 1px solid transparent; border-radius: 3px; font: inherit; cursor: pointer; transition: .2s ease; }
.button-primary { color: #fff; background: var(--navy); }
.button-primary:hover { background: var(--blue); }
.hero .button-primary { color: var(--navy); background: #fff; }
.hero .button-primary:hover { color: #fff; background: var(--blue); }
.button-secondary { color: var(--navy); border-color: #a8bfd4; background: rgba(255,255,255,.55); }
.hero .button-secondary { color: #fff; border-color: rgba(255,255,255,.42); background: rgba(255,255,255,.08); }
.hero-note { display: flex; flex-wrap: wrap; gap: 18px; color: #bad0e6; font-size: 13px; }
.hero-note span::before { content: ""; display: inline-block; width: 5px; height: 5px; margin: 0 8px 2px 0; border-radius: 50%; background: var(--gold); }
.hero-media { position: absolute; inset: 0; }
.hero-image-wrap { position: relative; width: 100%; height: 100%; overflow: hidden; }
.hero-image-wrap::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,17,35,.96) 0%, rgba(5,17,35,.88) 29%, rgba(5,17,35,.36) 58%, rgba(5,17,35,.04) 100%); }
.hero-image-wrap img { width: 100%; height: 100%; object-fit: cover; object-position: center; transition: opacity .35s ease; }
.hero-dots { position: absolute; z-index: 2; right: max(24px, calc((100% - 1180px) / 2)); bottom: 28px; display: flex; gap: 8px; }
.hero-dots button { width: 9px; height: 9px; padding: 0; border: 1px solid rgba(255,255,255,.85); border-radius: 50%; background: rgba(10,40,85,.35); cursor: pointer; }
.hero-dots button.is-active { background: #fff; }
.intro-strip { background: var(--navy); color: #fff; }
.intro-grid { display: grid; grid-template-columns: .7fr 1.2fr 1fr; gap: 35px; align-items: center; padding: 37px 0; }
.intro-grid .section-kicker { margin: 0; color: #8eb9e7; }
.intro-grid h2 { margin: 0; font-size: 27px; }
.intro-grid p:last-child { margin: 0; color: #bdd3e8; font-size: 14px; line-height: 1.8; }
.section { padding: 100px 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; border-bottom: 1px solid var(--line); }
.section-heading h2, .standards-copy h2, .about-panel h2, .contact-copy h2 { margin-bottom: 25px; color: var(--navy); font-size: 40px; letter-spacing: 0; }
.section-heading > p { max-width: 420px; margin-bottom: 25px; color: var(--muted); line-height: 1.8; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.product-card { display: flex; flex-direction: column; overflow: hidden; min-height: 440px; border: 1px solid var(--line); border-radius: 4px; background: #fff; transition: transform .25s ease, box-shadow .25s ease; }
.product-card:hover { transform: translateY(-5px); box-shadow: 0 16px 32px rgba(13,51,91,.12); }
.product-media { display: grid; place-items: center; min-height: 270px; padding: 22px; background: #fff; }
.product-media img { width: 100%; max-width: 245px; max-height: 245px; object-fit: contain; transition: transform .35s ease; }
.product-card:hover img { transform: scale(1.035); }
.product-body { margin-top: auto; padding: 0 28px 34px; }
.product-body p { margin-bottom: 14px; color: var(--blue); font-size: 14px; }
.product-body h3 { margin-bottom: 18px; color: var(--navy); font-size: 22px; line-height: 1.4; }
.product-price { display: block; margin-top: 15px; color: var(--red); font-size: 32px; line-height: 1.1; }
.price-note { margin: 18px 0 0; color: var(--muted); font-size: 12px; text-align: right; }
.standard-section { background: var(--soft); }
.standards-layout { display: grid; grid-template-columns: .84fr 1.16fr; gap: 56px; align-items: start; }
.standards-copy p:last-child { max-width: 400px; color: var(--muted); line-height: 1.9; }
.standard-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.standard-item { display: flex; gap: 18px; min-height: 175px; padding: 24px 20px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.standard-item b { color: var(--gold); font-size: 20px; }
.standard-item h3 { margin: 2px 0 10px; color: var(--navy); }
.standard-item p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.about-section { background: #fff; }
.about-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 44px; }
.about-panel { padding: 44px; background: #f3f8fd; border-left: 4px solid var(--blue); }
.about-paragraphs p { max-width: 680px; color: var(--muted); line-height: 1.95; }
.about-stats { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 36px; }
.about-stats span { color: var(--muted); font-size: 13px; }
.about-stats b { display: block; color: var(--navy); font-size: 31px; }
.about-quote { display: grid; place-content: center; justify-items: center; min-height: 320px; padding: 30px; color: #fff; text-align: center; background: var(--navy); }
.about-quote img { width: 78px; margin-bottom: 20px; }
.about-quote blockquote { margin: 0 0 15px; font-size: 27px; font-weight: 700; }
.about-quote p { margin: 0; color: #9dc1e4; font-size: 12px; letter-spacing: 3px; }
.contact-section { color: #fff; background: #123663; }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 68px; }
.contact-copy .section-kicker { color: #8eb9e7; }
.contact-copy h2 { color: #fff; }
.contact-copy > p:last-of-type { max-width: 500px; color: #c3d5e6; line-height: 1.85; }
dl { display: grid; gap: 16px; margin-top: 34px; }
dl div { display: grid; grid-template-columns: 88px 1fr; gap: 8px; }
dt { color: #8eb9e7; font-size: 13px; }
dd { margin: 0; color: #fff; font-size: 14px; }
.wechat-block { display: flex; align-items: center; gap: 14px; margin-top: 28px; color: #fff; font-size: 14px; }
.wechat-block img { width: 112px; height: 112px; object-fit: cover; border: 5px solid #fff; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding: 27px; background: #fff; color: var(--ink); }
.contact-form label { display: grid; gap: 8px; color: var(--navy); font-size: 13px; font-weight: 700; }
.contact-form label:nth-of-type(4), .submit-button, .form-status { grid-column: 1 / -1; }
input, select, textarea { width: 100%; border: 1px solid #cfdbe6; border-radius: 2px; padding: 12px 11px; color: var(--ink); font: inherit; background: #fff; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid #a9c7e5; border-color: var(--blue); }
.submit-button:disabled { opacity: .65; cursor: wait; }
.form-status { min-height: 18px; margin: 0; font-size: 13px; }
.form-status.success { color: #167448; }
.form-status.error { color: var(--red); }
.site-footer { padding: 23px 0; color: #778695; border-top: 1px solid var(--line); font-size: 12px; }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; }
.wechat-float { position: fixed; right: 22px; bottom: 24px; z-index: 18; display: grid; justify-items: center; gap: 6px; padding: 9px; color: var(--navy); border: 1px solid var(--line); border-radius: 4px; background: #fff; box-shadow: 0 10px 24px rgba(10,40,85,.18); font-size: 12px; font-weight: 700; }
.wechat-float img { width: 78px; height: 78px; object-fit: cover; }

@media (max-width: 900px) {
  .main-nav { position: absolute; top: 76px; right: 0; left: 0; display: none; padding: 12px 24px 22px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 16px 24px rgba(20,45,70,.08); }
  .main-nav.is-open { display: grid; gap: 15px; }
  .menu-toggle { display: block; }
  .hero-grid { min-height: 590px; padding: 64px 0 72px; }
  h1 { font-size: 50px; }
  .intro-grid { grid-template-columns: 1fr; gap: 10px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .standards-layout, .contact-layout { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1180px); }
  .header-inner { min-height: 68px; }
  .main-nav { top: 68px; }
  .brand img { width: 40px; height: 46px; }
  .brand strong { font-size: 20px; }
  .hero-grid { min-height: 570px; padding: 46px 0 52px; }
  h1 { font-size: 38px; }
  .hero-description { font-size: 15px; }
  .hero-image-wrap img { object-position: 63% center; }
  .hero-dots { right: 14px; bottom: 16px; }
  .section { padding: 72px 0; }
  .section-heading { display: block; }
  .section-heading h2, .standards-copy h2, .about-panel h2, .contact-copy h2 { font-size: 32px; }
  .product-grid { grid-template-columns: 1fr; }
  .standard-grid { grid-template-columns: 1fr; }
  .standard-item { min-height: 130px; }
  .about-panel { padding: 28px 22px; }
  .contact-layout { gap: 34px; }
  .contact-form { grid-template-columns: 1fr; padding: 20px; }
  .contact-form label { grid-column: 1 / -1; }
  .footer-inner { display: grid; }
  .wechat-float { right: 12px; bottom: 14px; padding: 7px; }
  .wechat-float img { width: 62px; height: 62px; }
}