*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 80% -10%, rgba(26, 168, 199, 0.18), transparent 32%),
    radial-gradient(circle at 0% 40%, rgba(212, 180, 131, 0.06), transparent 28%),
    var(--bg);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 28px;
  width: 100%;
  height: var(--nav-h);
  padding: 0 36px;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}

.nav.is-solid,
.nav.is-inner {
  background: rgba(5, 8, 15, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  letter-spacing: 0.18em;
}

.brand img {
  width: 54px;
  height: 28px;
  object-fit: cover;
  object-position: center;
  border-radius: 40px;
}

.brand strong {
  font-size: 15px;
  font-weight: 500;
}

.brand small {
  display: block;
  margin-top: 1px;
  color: var(--dim);
  font-family: var(--display);
  font-size: 11px;
  letter-spacing: 0.28em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-menu a {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.nav-menu a:hover,
.nav-menu a.is-active {
  color: var(--text);
}

.nav-cta {
  padding: 9px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--cyan) !important;
  font-size: 13px !important;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 16px;
  height: 1px;
  margin: 0 auto;
  background: var(--text);
  content: "";
}

.nav-toggle span {
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  position: absolute;
  left: 0;
}

.nav-toggle span::before {
  top: -5px;
}

.nav-toggle span::after {
  top: 5px;
}

.site-footer {
  padding: 56px 36px 28px;
  border-top: 1px solid var(--line);
  background: #04070c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  max-width: var(--max);
  margin: 0 auto 36px;
}

.site-footer h2,
.site-footer h3 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
}

.site-footer p,
.site-footer li {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li + li {
  margin-top: 8px;
}

.site-footer a:hover {
  color: var(--cyan);
}

.footer-note {
  max-width: var(--max);
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 12px;
  line-height: 1.8;
}

.footer-beian {
  max-width: var(--max);
  margin: 10px auto 0;
  color: var(--dim);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer-beian a:hover {
  color: var(--cyan);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 860px) {
  .nav {
    padding: 0 18px;
  }

  .nav-toggle {
    display: grid;
    place-items: center;
  }

  .nav-menu {
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 22px 32px;
    background: rgba(5, 8, 15, 0.96);
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu a {
    width: 100%;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    font-size: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}