:root {
  --navy: #0f3460;
  --navy-2: #092642;
  --ink: #172536;
  --muted: #657487;
  --blue: #2c78b9;
  --gold: #d4af37;
  --gold-soft: #f2e7bd;
  --light-blue: #eaf3f8;
  --paper: #f7f8fa;
  --white: #ffffff;
  --line: #dbe3ec;
  --radius: 3px;
  --shadow: 0 16px 45px rgba(15, 52, 96, 0.1);
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input,
textarea,
select {
  font: inherit;
}
button {
  cursor: pointer;
}
.container {
  width: min(1160px, calc(100% - 64px));
  margin: 0 auto;
}
.hero-grid > *,
.about-grid > *,
.bridge-grid > *,
.faq-grid > *,
.contact-grid > * {
  min-width: 0;
}

.topline {
  background: var(--navy-2);
  color: rgba(255, 255, 255, 0.76);
  font-size: 11px;
  letter-spacing: 0.03em;
}
.top-line-inner {
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topline-right {
  color: rgba(255, 255, 255, 0.52);
}
.dot {
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--gold);
  margin: 0 8px 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 248, 250, 0.94);
  border-bottom: 1px solid rgba(219, 227, 236, 0.75);
  backdrop-filter: blur(15px);
}
.nav-wrap {
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 214px;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--navy);
  color: var(--gold);
  font-family: Inter, sans-serif;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.08em;
}
.brand strong {
  display: block;
  color: var(--navy);
  font-size: 16px;
  line-height: 1.1;
  letter-spacing: 0.06em;
  font-weight: 700;
}
.brand small {
  display: block;
  margin-top: 4px;
  font:
    9px/1 Inter,
    sans-serif;
  letter-spacing: 0.16em;
  color: var(--muted);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}
.main-nav a,
.mobile-nav a {
  font-size: 13px;
  color: var(--muted);
  transition: color 0.2s ease;
}
.main-nav a:hover,
.mobile-nav a:hover {
  color: var(--navy);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.language-switch {
  display: inline-flex;
  align-items: center;
  padding: 2px;
  border: 1px solid var(--line);
  background: var(--white);
}

.language-switch button {
  min-width: 34px;
  height: 28px;
  padding: 0 7px;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-size: 11px;
}

.language-switch button.active {
  color: var(--white);
  background: var(--navy);
  font-weight: 700;
}
.nav-cta {
  padding: 10px 16px;
  background: var(--navy);
  color: var(--white);
  font-size: 12px;
  transition:
    transform 0.2s ease,
    background 0.2s ease;
}
.nav-cta:hover {
  background: var(--blue);
  transform: translateY(-2px);
}
.menu-toggle,
.mobile-nav {
  display: none;
}