:root {
  --navy: #0a1a33;
  --navy-2: #0f2549;
  --blue: #1b5fae;
  --blue-light: #2f8fe0;
  --orange: #f5791f;
  --orange-2: #ff9142;
  --bg: #f6f8fb;
  --text: #17233d;
  --text-soft: #56637c;
  --border: #e3e8f0;
  --radius: 10px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* language toggle visibility */
html:not(.lang-en) .lang-en { display: none !important; }
html.lang-en .lang-zh { display: none !important; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 26, 51, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand { display: flex; align-items: center; }
.brand img { height: 76px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: #d7e2f5;
  font-size: 14.5px;
  font-weight: 500;
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
  white-space: nowrap;
}
.nav-links a:hover { color: #fff; border-color: var(--orange); }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 10px;
}
.lang-switch button {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  color: #cfe0f7;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: all .2s;
}
.lang-switch button.active {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 22px; height: 2px; background: #fff; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  background: linear-gradient(120deg, rgba(6,16,35,.92) 10%, rgba(10,30,60,.72) 55%, rgba(10,30,60,.35)),
              url('../assets/images/hero-stamping.jpg') center/cover no-repeat;
}

.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 100px 24px 90px;
  width: 100%;
}

.hero-kicker {
  display: inline-block;
  color: var(--orange-2);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 18px;
  padding: 6px 14px;
  border: 1px solid rgba(245,121,31,0.5);
  border-radius: 20px;
}

.hero h1 {
  color: #fff;
  font-size: 42px;
  line-height: 1.28;
  max-width: 720px;
  margin: 0 0 20px;
  font-weight: 700;
}

.hero p {
  color: #cfdcf2;
  font-size: 16.5px;
  max-width: 620px;
  margin: 0 0 34px;
}

.btn-row { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 6px;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .2s;
}
.btn-primary { background: var(--orange); color: #fff; box-shadow: 0 8px 20px rgba(245,121,31,0.35); }
.btn-primary:hover { background: var(--orange-2); transform: translateY(-2px); }
.btn-ghost { background: rgba(255,255,255,0.08); color: #fff; border: 1px solid rgba(255,255,255,0.35); }
.btn-ghost:hover { background: rgba(255,255,255,0.16); transform: translateY(-2px); }

/* ---------- Stats ---------- */
.stats {
  background: var(--navy-2);
  padding: 34px 0;
}
.stats-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-num { color: var(--orange-2); font-size: 30px; font-weight: 800; letter-spacing: .5px; }
.stat-label { color: #b9c9e6; font-size: 13px; margin-top: 6px; }

/* ---------- Section basics ---------- */
section { padding: 88px 0; }
.section-tight { padding: 70px 0; }
.section-alt { background: #fff; }

.section-head { max-width: 720px; margin: 0 auto 50px; text-align: center; }
.section-kicker {
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head h2 { font-size: 30px; margin: 0 0 14px; color: var(--navy); }
.section-head p { color: var(--text-soft); font-size: 15px; margin: 0; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.about-text .section-kicker { margin-top: 0; }
.about-text h2 { font-size: 28px; color: var(--navy); margin: 0 0 18px; }
.about-text p { color: var(--text-soft); font-size: 15px; margin: 0 0 16px; }
.about-points {
  list-style: none;
  padding: 0;
  margin: 26px 0 0;
  display: grid;
  gap: 14px;
}
.about-points li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 14.5px;
  color: var(--text);
}
.about-points li::before {
  content: "";
  flex: 0 0 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  margin-top: 7px;
}
.about-media { position: relative; }
.about-media img {
  border-radius: var(--radius);
  box-shadow: 0 20px 45px rgba(15,37,73,0.18);
}
.about-badge {
  position: absolute;
  bottom: -22px;
  left: -22px;
  background: var(--navy);
  color: #fff;
  padding: 16px 22px;
  border-radius: 10px;
  box-shadow: 0 14px 30px rgba(10,26,51,0.3);
}
.about-badge .n { color: var(--orange-2); font-size: 22px; font-weight: 800; }
.about-badge .l { font-size: 12px; color: #cfe0f7; margin-top: 2px; }

/* ---------- Services ---------- */
.svc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.svc-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.svc-card:hover { transform: translateY(-6px); box-shadow: 0 18px 34px rgba(15,37,73,0.14); }
.svc-thumb { height: 168px; overflow: hidden; }
.svc-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.svc-card:hover .svc-thumb img { transform: scale(1.06); }
.svc-body { padding: 20px 22px 24px; }
.svc-num { color: var(--orange); font-weight: 800; font-size: 13px; letter-spacing: 1px; }
.svc-body h3 { font-size: 17px; margin: 8px 0 10px; color: var(--navy); }
.svc-body p { font-size: 13.8px; color: var(--text-soft); margin: 0; }

/* ---------- Partners ---------- */
.partners-band { background: var(--navy); padding: 60px 0; }
.partners-band .section-head h2 { color: #fff; }
.partners-band .section-head p { color: #b9c9e6; }
.partner-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.partner-pill {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius);
  padding: 26px 10px;
  text-align: center;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 1px;
  transition: background .2s, transform .2s;
}
.partner-pill:hover { background: rgba(245,121,31,0.16); transform: translateY(-4px); border-color: var(--orange); }
.partner-pill span { display: block; font-size: 11px; font-weight: 500; color: #a9bede; letter-spacing: .5px; margin-top: 6px; }

/* ---------- Certificates ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.cert-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-align: center;
}
.cert-card img { width: 100%; height: 220px; object-fit: cover; object-position: top; border-bottom: 1px solid var(--border); }
.cert-card .cert-label { padding: 14px 10px; font-size: 13.5px; font-weight: 600; color: var(--navy); }

/* ---------- Culture ---------- */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.culture-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.culture-card .icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), var(--blue-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 16px;
}
.culture-card h3 { margin: 0 0 10px; font-size: 17px; color: var(--navy); }
.culture-card p { margin: 0; font-size: 14px; color: var(--text-soft); }

/* ---------- Cases ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 190px;
  gap: 16px;
}
.case-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
}
.case-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.case-card:hover img { transform: scale(1.08); }
.case-card.wide { grid-column: span 2; }
.case-card.tall { grid-row: span 2; }
.case-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(6,16,35,.88), rgba(6,16,35,0) 60%);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.case-overlay span { color: #fff; font-size: 13px; font-weight: 600; line-height: 1.4; }

/* ---------- Global presence ---------- */
.global-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.global-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}
.global-card .flag { font-size: 26px; margin-bottom: 12px; }
.global-card h3 { margin: 0 0 8px; font-size: 16.5px; color: var(--navy); }
.global-card p { margin: 0; font-size: 13.8px; color: var(--text-soft); }

/* ---------- Contact ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  background: var(--navy);
  border-radius: 16px;
  padding: 50px;
  color: #fff;
}
.contact-info h2 { font-size: 28px; margin: 0 0 14px; }
.contact-info p { color: #b9c9e6; font-size: 14.5px; margin: 0 0 26px; }
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; }
.contact-list li { display: flex; gap: 14px; align-items: flex-start; font-size: 14.5px; }
.contact-list .ic {
  flex: 0 0 40px;
  width: 40px; height: 40px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
  display: flex; align-items: center; justify-content: center;
  font-size: 17px;
}
.contact-list .label { color: #9db3d6; font-size: 12.5px; margin-bottom: 2px; }
.contact-list .val { font-weight: 600; }
.contact-form { background: rgba(255,255,255,0.06); border-radius: 12px; padding: 26px; border: 1px solid rgba(255,255,255,0.12); }
.contact-form label { display: block; font-size: 12.5px; color: #b9c9e6; margin: 14px 0 6px; }
.contact-form label:first-child { margin-top: 0; }
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.04);
  color: #fff;
  font-size: 14px;
  font-family: inherit;
}
.contact-form textarea { resize: vertical; min-height: 90px; }
.contact-form .btn-primary { width: 100%; text-align: center; border: none; margin-top: 20px; }

/* ---------- Footer ---------- */
.site-footer {
  background: #071021;
  color: #93a5c4;
  padding: 44px 0 24px;
  font-size: 13.5px;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand { display: flex; align-items: center; }
.footer-brand img { height: 58px; }
.footer-links { display: flex; gap: 26px; list-style: none; padding: 0; margin: 0; flex-wrap: wrap; }
.footer-bottom { padding-top: 20px; text-align: center; color: #64769c; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  box-shadow: 0 10px 24px rgba(245,121,31,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s, transform .2s;
  z-index: 90;
  border: none;
  cursor: pointer;
}
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { transform: translateY(-3px); }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .about-grid, .contact-wrap { grid-template-columns: 1fr; }
  .svc-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid, .partner-row, .global-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .culture-grid { grid-template-columns: 1fr; }
  .contact-wrap { padding: 32px; }
}

@media (max-width: 760px) {
  .nav-links, .lang-switch { position: absolute; top: 100%; left: 0; right: 0; background: var(--navy); flex-direction: column; align-items: flex-start; padding: 20px 24px; gap: 16px; display: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .nav-links.open, .lang-switch.open { display: flex; }
  .lang-switch.open { flex-direction: row; top: auto; position: static; padding: 0; margin-top: 6px; background: none; border: none; }
  .nav-toggle { display: flex; }
  .hero h1 { font-size: 30px; }
  .hero-inner { padding: 70px 20px 60px; }
  .svc-grid, .cert-grid, .partner-row, .global-grid, .case-grid { grid-template-columns: 1fr; }
  .case-card.wide, .case-card.tall { grid-column: span 1; grid-row: span 1; height: 220px; }
  section { padding: 60px 0; }
}