:root {
  --navy: #0F2136;
  --navy-2: #16304F;
  --blue: #1D5FD0;
  --blue-dark: #1448A0;
  --steel: #5B6B80;
  --ink: #1C2733;
  --muted: #5C6B7C;
  --bg: #FFFFFF;
  --bg-alt: #F5F7FA;
  --line: #E4E9EF;
  --radius: 10px;
  --shadow: 0 10px 28px rgba(15, 33, 54, .08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 860px; }

/* ---------- Topbar ---------- */
.topbar { background: var(--navy); color: #9DB0C8; font-size: .8rem; }
.topbar-inner { display: flex; justify-content: space-between; align-items: center; height: 34px; }
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-left a { color: #C8D6E8; text-decoration: none; font-weight: 500; }
.topbar-left a:hover { color: #fff; }
.topbar-sep { width: 1px; height: 12px; background: #2C466B; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.2rem; letter-spacing: .12em; color: var(--navy); text-decoration: none; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { color: var(--steel); text-decoration: none; font-size: .9rem; font-weight: 500; }
.nav a:hover { color: var(--blue); }
.lang-switch { display: flex; gap: 3px; }
.lang-btn {
  border: none; background: transparent; border-radius: 6px;
  padding: 3px 9px; font-size: .78rem; font-weight: 600; cursor: pointer; color: #7D8EA3;
}
.lang-btn.active { background: var(--navy); color: #fff; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--navy); border-radius: 2px; }

/* ---------- Buttons ---------- */
.btn { display: inline-block; padding: 12px 28px; border-radius: 6px; font-weight: 600; text-decoration: none; font-size: .93rem; transition: .2s; border: none; cursor: pointer; letter-spacing: .01em; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-ghost { border: 1px solid rgba(255,255,255,.35); color: #fff; background: transparent; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-sm { padding: 8px 18px; font-size: .85rem; }
.btn-lg { padding: 14px 40px; font-size: 1rem; }

/* ---------- Hero ---------- */
.hero { position: relative; background: var(--navy); color: #EAF1FA; overflow: hidden; }
.hero-grid-bg {
  position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(75% 90% at 60% 40%, #000 30%, transparent 100%);
  mask-image: radial-gradient(75% 90% at 60% 40%, #000 30%, transparent 100%);
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; padding: 88px 24px 64px; }
.kicker { display: inline-block; font-size: .74rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--blue); margin-bottom: 16px; }
.kicker-dark { color: #7FA3E0; }
.kicker-light { color: #8FB0E8; }
h1 { font-size: 2.9rem; line-height: 1.12; letter-spacing: -.015em; font-weight: 700; }
.lead { margin: 18px 0 28px; color: var(--muted); font-size: 1.05rem; max-width: 520px; }
.hero .lead { color: #A9BCD4; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-chips { list-style: none; display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 34px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1); }
.hero-chips li { font-size: .85rem; color: #93A9C6; position: relative; padding-left: 18px; }
.hero-chips li::before { content: ""; position: absolute; left: 0; top: 7px; width: 7px; height: 7px; border-radius: 2px; background: var(--blue); }
.hero-art svg { max-width: 470px; display: block; margin: 0 auto; }

/* ---------- Stats ---------- */
.stats { background: var(--bg-alt); border-bottom: 1px solid var(--line); }
.stats-grid { display: grid; grid-template-columns: repeat(5,1fr); padding: 34px 24px; text-align: left; }
.stat { padding: 0 26px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: none; padding-left: 0; }
.stat strong { display: block; font-size: 1.8rem; font-weight: 700; color: var(--navy); letter-spacing: -.02em; }
.stat span { font-size: .82rem; color: var(--muted); }

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: 1.9rem; letter-spacing: -.01em; margin-bottom: 10px; color: var(--navy); }
.section-sub { color: var(--muted); margin: 6px 0 38px; font-size: 1rem; }
.sec-head { margin-bottom: 36px; }
.sec-head.center { text-align: center; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; }
.about-grid p { margin-bottom: 14px; color: var(--muted); }
.philosophy { display: flex; gap: 36px; margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
.philosophy strong { display: block; color: var(--blue); font-size: .76rem; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 2px; }
.cards-2 { display: grid; gap: 18px; align-content: start; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.card h3 { font-size: 1rem; margin-bottom: 12px; color: var(--navy); }
.card ul { list-style: none; }
.card li { padding: 5px 0 5px 22px; position: relative; color: var(--muted); font-size: .93rem; }
.card li::before { content: ""; position: absolute; left: 0; top: 13px; width: 12px; height: 2px; background: var(--blue); }

/* ---------- Product range ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.prod-card { position: relative; transition: .25s; }
.prod-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #C7D4E4; }
.line-icon { width: 44px; height: 44px; margin-bottom: 16px; color: var(--blue); }
.prod-card p { color: var(--muted); font-size: .92rem; margin: 8px 0 16px; }
.prod-count { font-size: .78rem; font-weight: 600; color: var(--steel); background: var(--bg-alt); border: 1px solid var(--line); padding: 4px 12px; border-radius: 4px; letter-spacing: .02em; }
.prod-new { border-color: var(--blue); }
.new-badge { position: absolute; top: 18px; right: 18px; background: var(--blue); color: #fff; font-size: .68rem; font-weight: 700; letter-spacing: .08em; padding: 4px 10px; border-radius: 3px; }

/* ---------- Featured ---------- */
.featd-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.featd-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: .25s; position: relative; }
.featd-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.featd-thumb {
  background: var(--bg-alt); border-bottom: 1px solid var(--line);
  padding: 26px; display: flex; justify-content: center; align-items: center; color: var(--navy);
  min-height: 214px;
}
.featd-thumb svg { width: 72px; height: 72px; }
.featd-thumb img { width: 100%; height: 190px; object-fit: contain; display: block; mix-blend-mode: multiply; }
.featd-body { padding: 22px 26px 26px; }
.featd-tag { display: inline-block; font-size: .68rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--blue); border: 1px solid #C9D9F2; border-radius: 3px; padding: 3px 9px; margin-bottom: 12px; }
.featd-tag-new { color: #fff; background: var(--blue); border-color: var(--blue); }
.featd-card h3 { font-size: 1.05rem; margin-bottom: 12px; color: var(--navy); }
.spec-list { list-style: none; border-top: 1px solid var(--line); }
.spec-list li { font-size: .87rem; color: var(--muted); padding: 7px 0; border-bottom: 1px solid var(--line); position: relative; padding-left: 16px; }
.spec-list li:last-child { border-bottom: none; }
.spec-list li::before { content: ""; position: absolute; left: 0; top: 15px; width: 6px; height: 6px; border-radius: 50%; background: #B9CBE4; }
.featd-new { border-color: var(--blue); }

/* ---------- Features ---------- */
.feat-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
.feat { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: center; }
.feat strong { display: block; color: var(--navy); font-size: 1.15rem; margin-bottom: 4px; }
.feat span { font-size: .86rem; color: var(--muted); }

/* ---------- Quality ---------- */
.qa-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
.qa-step { background: var(--bg-alt); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; position: relative; }
.qa-num { display: inline-block; font-size: .78rem; font-weight: 800; letter-spacing: .1em; color: #fff; background: var(--navy); padding: 4px 12px; border-radius: 3px; margin-bottom: 14px; font-variant-numeric: tabular-nums; }
.qa-step strong { display: block; margin-bottom: 6px; font-size: .97rem; color: var(--navy); }
.qa-step span:last-child { color: var(--muted); font-size: .87rem; }
.qa-eng { margin-top: 26px; background: var(--navy); border-radius: var(--radius); padding: 30px 34px; }
.qa-eng h3 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.qa-eng ul { list-style: none; display: grid; grid-template-columns: repeat(3,1fr); gap: 10px 28px; }
.qa-eng li { color: #A9BCD4; font-size: .9rem; padding-left: 20px; position: relative; }
.qa-eng li::before { content: "—"; position: absolute; left: 0; color: var(--blue); opacity: .9; }

/* ---------- Process ---------- */
.proc-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 16px; }
.proc-step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 20px; position: relative; transition: .2s; }
.proc-step:hover { border-color: #C7D4E4; box-shadow: var(--shadow); }
.proc-num { display: inline-block; font-size: 1.3rem; font-weight: 800; color: #C7D4E8; margin-bottom: 12px; font-variant-numeric: tabular-nums; letter-spacing: .02em; }
.proc-step strong { display: block; margin-bottom: 6px; font-size: .96rem; color: var(--navy); }
.proc-step span:last-child { color: var(--muted); font-size: .85rem; }
.proc-step::after { content: ""; position: absolute; right: -14px; top: 50%; width: 10px; height: 10px; border-top: 2px solid #A9BCD4; border-right: 2px solid #A9BCD4; transform: translateY(-50%) rotate(45deg); }
.proc-step:last-child::after { content: none; }

/* ---------- Why ---------- */
.why-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.why-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; border-top: 3px solid var(--navy); transition: .2s; }
.why-item:hover { border-top-color: var(--blue); box-shadow: var(--shadow); }
.why-item strong { display: block; margin-bottom: 6px; color: var(--navy); }
.why-item span { color: var(--muted); font-size: .92rem; }

/* ---------- Certs & markets ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; }
.cert-badges { display: flex; flex-wrap: wrap; gap: 12px; }
.cert-badges span { border: 1px solid #C9D4E1; color: var(--navy); font-weight: 700; padding: 10px 24px; border-radius: 6px; font-size: .95rem; letter-spacing: .04em; background: #fff; }
.cert-note { color: var(--muted); font-size: .88rem; margin-top: 18px; max-width: 420px; }
.mkt-list { list-style: none; }
.mkt-list li { padding: 10px 0 10px 24px; position: relative; color: var(--muted); border-bottom: 1px solid var(--line); font-size: .95rem; }
.mkt-list li::before { content: ""; position: absolute; left: 2px; top: 17px; width: 8px; height: 8px; border: 2px solid var(--blue); border-radius: 50%; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 10px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.faq-item.open { border-color: #C7D4E4; box-shadow: var(--shadow); }
.faq-q { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px; background: none; border: none; text-align: left; padding: 17px 22px; font-size: .98rem; font-weight: 600; color: var(--navy); cursor: pointer; font-family: inherit; }
.faq-q i { font-style: normal; font-weight: 400; color: var(--blue); font-size: 1.4rem; transition: .25s; line-height: 1; }
.faq-item.open .faq-q i { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 22px 20px; color: var(--muted); font-size: .92rem; }

/* ---------- Contact ---------- */
.section-dark { background: var(--navy-2); color: #fff; text-align: center; padding: 84px 0; }
.section-dark h2 { color: #fff; }
.section-dark .lead { margin: 8px auto 32px; }
.contact-cards { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin: 0 0 34px; }
.contact-card { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius); padding: 18px 30px; min-width: 220px; text-decoration: none; transition: .2s; }
.contact-card:hover { background: rgba(255,255,255,.1); }
.contact-card strong { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; opacity: .6; margin-bottom: 4px; }
.contact-card span { font-size: .98rem; color: #EAF1FA; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: #8DA1BB; padding: 52px 0 0; font-size: .87rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 40px; }
.footer-brand p { margin-top: 14px; max-width: 300px; }
.logo-light { color: #fff; }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col strong { color: #DDE6F0; font-size: .78rem; text-transform: uppercase; letter-spacing: .12em; margin-bottom: 4px; }
.footer-col a { color: #8DA1BB; text-decoration: none; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 18px 24px; border-top: 1px solid #1E3A5C; font-size: .78rem; color: #6E84A0; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .55s ease, transform .55s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner, .about-grid, .two-col { grid-template-columns: 1fr; }
  .prod-grid, .featd-grid { grid-template-columns: repeat(2,1fr); }
  .why-grid, .feat-grid { grid-template-columns: repeat(2,1fr); }
  .stats-grid { grid-template-columns: repeat(3,1fr); row-gap: 24px; }
  .qa-grid { grid-template-columns: repeat(2,1fr); }
  .proc-grid { grid-template-columns: repeat(2,1fr); }
  .proc-step::after { content: none; }
  .qa-eng ul { grid-template-columns: repeat(2,1fr); }
  h1 { font-size: 2.3rem; }
  .nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 18px 24px; gap: 14px; border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 30px rgba(15,33,54,.08);
  }
  .nav.open { display: flex; }
  .menu-toggle { display: flex; }
  .stat { padding: 0 16px; }
}
@media (max-width: 600px) {
  .prod-grid, .featd-grid, .why-grid, .proc-grid, .qa-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .feat-grid { grid-template-columns: 1fr; }
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.5rem; }
  .hero-inner { padding: 56px 24px 48px; }
  .footer-grid { grid-template-columns: 1fr; }
  .topbar-left span:last-child { display: none; }
}