:root {
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --ink: #15212e;
  --muted: #5b6675;
  --line: #e6ebf2;
  --accent: #0f4c81;        /* 深蓝 — 贸易/工业感 */
  --accent-2: #f5a623;      /* 暖橙 — 活力点缀 */
  --radius: 16px;
  --shadow: 0 10px 30px rgba(21,33,46,.08);
  --maxw: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  background: rgba(255,255,255,.82);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { font-weight: 800; font-size: 20px; letter-spacing: .5px; display: flex; flex-direction: column; line-height: 1.1; }
.brand span { font-size: 11px; letter-spacing: 3px; color: var(--accent); font-weight: 700; }
.nav__links { display: flex; gap: 26px; }
.nav__links a { color: var(--muted); font-size: 15px; transition: color .2s; }
.nav__links a:hover { color: var(--accent); }
.nav__right { display: flex; align-items: center; gap: 14px; }
.lang-toggle {
  border: 1px solid var(--line); background: #fff; color: var(--accent);
  font-weight: 700; font-size: 13px; letter-spacing: 1px;
  padding: 6px 12px; border-radius: 999px; cursor: pointer; transition: all .2s;
}
.lang-toggle:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.nav__toggle { display: none; background: none; border: 0; font-size: 22px; cursor: pointer; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 86vh; display: flex; align-items: center;
  overflow: hidden; padding: 0 24px;
}
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(55% 55% at 85% 15%, rgba(15,76,129,.12), transparent 60%),
    radial-gradient(50% 50% at 5% 90%, rgba(245,166,35,.14), transparent 60%),
    linear-gradient(180deg, #ffffff, #f4f7fb);
}
.hero__content { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; width: 100%; }
.hero__eyebrow {
  display: inline-block; font-size: 12px; letter-spacing: 2px; color: var(--accent);
  font-weight: 700; text-transform: uppercase; margin-bottom: 18px;
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.6);
}
.hero__title { font-size: clamp(36px, 6vw, 70px); line-height: 1.08; font-weight: 800; }
.grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub { margin-top: 22px; font-size: clamp(16px, 2vw, 20px); color: var(--muted); max-width: 600px; }
.hero__cta { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero__scroll { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); font-size: 26px; color: var(--muted); animation: bob 1.8s infinite; }
@keyframes bob { 0%,100%{ transform: translate(-50%,0);} 50%{ transform: translate(-50%,8px);} }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 999px;
  font-weight: 600; font-size: 15px; transition: transform .15s, box-shadow .2s, background .2s;
}
.btn--primary { color: #fff; background: linear-gradient(90deg, var(--accent), #1b6fb0); box-shadow: 0 8px 20px rgba(15,76,129,.28); }
.btn--primary:hover { transform: translateY(-2px); }
.btn--ghost { color: var(--ink); border: 1px solid var(--line); background: #fff; }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Sections ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: 92px 24px; }
.section--alt { max-width: none; background: var(--bg-alt); }
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section__head { margin-bottom: 44px; }
.kicker { font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); font-weight: 700; }
.section__head h2 { font-size: clamp(26px, 4vw, 40px); margin-top: 10px; font-weight: 800; }
.section__note { color: var(--muted); margin: -20px 0 28px; font-size: 14px; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; align-items: center; }
.about__lead p { color: var(--muted); margin-bottom: 16px; font-size: 17px; }
.about__stats { list-style: none; display: grid; gap: 16px; }
.about__stats li { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow); }
.about__stats b { display: block; font-size: 26px; color: var(--accent); }
.about__stats span { color: var(--muted); font-size: 14px; }

/* ---------- Cards (products) ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px; box-shadow: var(--shadow); transition: transform .2s, border-color .2s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); }
.card__icon { font-size: 30px; margin-bottom: 12px; }
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }

/* ---------- Business ---------- */
.biz { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.biz__item { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 12px; padding: 22px; box-shadow: var(--shadow); }
.biz__item b { display: block; font-size: 18px; margin-bottom: 6px; color: var(--accent); }
.biz__item span { color: var(--muted); font-size: 15px; }

/* ---------- Contact ---------- */
.section--contact { text-align: center; }
.contact__lead { color: var(--muted); font-size: 18px; margin-bottom: 28px; }
.contact__list { list-style: none; display: inline-grid; gap: 12px; margin-bottom: 32px; text-align: left; }
.contact__list li { font-size: 16px; }
.contact__list span { display: inline-block; width: 96px; color: var(--muted); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 32px 24px; text-align: center; color: var(--muted); }
.footer__sub { font-size: 13px; margin-top: 6px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .nav__links { position: fixed; top: 60px; right: 0; left: 0; flex-direction: column; background: #fff; border-bottom: 1px solid var(--line); padding: 16px 24px; gap: 16px; display: none; }
  .nav__links.open { display: flex; }
  .nav__toggle { display: block; }
  .about { grid-template-columns: 1fr; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .biz { grid-template-columns: 1fr; }
}
@media (max-width: 520px) { .cards { grid-template-columns: 1fr; } }