:root {
  --ink: #15191f;
  --navy: #071b31;
  --blue: #176dff;
  --cyan: #10b9c8;
  --text: #334155;
  --muted: #64748b;
  --line: #d9e2ef;
  --line-soft: #edf2f7;
  --paper: #ffffff;
  --mist: #f5f8fb;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-soft: 0 18px 46px rgba(7, 27, 49, 0.09);
  --shadow-lift: 0 24px 60px rgba(7, 27, 49, 0.12);
  --container: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p { margin-top: 0; }

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 50;
  width: 100%;
  border-bottom: 1px solid rgba(217, 226, 239, 0.66);
  background: #fff;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.04);
}
.nav-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  min-height: 80px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
}
.logo-area { min-width: 0; flex: 0 1 auto; }
.brand { display: inline-flex; min-width: 0; align-items: center; gap: 14px; }
.brand-mark { width: 70px; height: 44px; flex: 0 0 auto; }
.brand-mark img, .brand-mark .custom-logo-link, .brand-mark .custom-logo { width: 100%; height: 100%; object-fit: contain; }
.brand-copy { display: grid; gap: 2px; min-width: 0; }
.brand strong { color: var(--ink); font-size: 15px; line-height: 1.2; font-weight: 800; white-space: nowrap; }
.brand small { color: #718096; font-size: 10.5px; letter-spacing: 0.02em; }
.site-nav .menu, .site-nav ul { display: flex; align-items: center; gap: 23px; margin: 0; padding: 0; list-style: none; }
.site-nav li { position: relative; }
.site-nav a { color: #263244; font-size: 14px; font-weight: 650; opacity: 0.84; transition: color 180ms ease, opacity 180ms ease, transform 180ms ease; }
.site-nav a:hover { color: var(--blue); opacity: 1; transform: translateY(-1px); }
.site-nav .nav-cta, .site-nav a.nav-cta {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 9px 19px;
  border: 1px solid rgba(7, 27, 49, 0.1);
  border-radius: 999px;
  color: var(--paper);
  background: var(--navy);
  opacity: 1;
}
.site-nav .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  display: grid;
  min-width: 230px;
  gap: 4px;
  padding: 12px;
  border: 1px solid rgba(7, 27, 49, 0.1);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-lift);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 180ms ease, transform 180ms ease;
}
.site-nav .menu-item-has-children:hover > .sub-menu,
.site-nav .menu-item-has-children:focus-within > .sub-menu { opacity: 1; pointer-events: auto; transform: translateY(0); }
.site-nav .sub-menu a { display: block; padding: 10px; border-radius: var(--radius-sm); white-space: nowrap; }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(7, 27, 49, 0.12);
  border-radius: var(--radius-sm);
  color: var(--navy);
  background: var(--paper);
}
.nav-toggle span { display: block; width: 18px; height: 2px; margin: 4px auto; border-radius: 999px; background: currentColor; }

.section { padding: 94px 0; }
.section-kicker { margin-bottom: 16px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; }
.section-heading { width: min(760px, calc(100% - 40px)); margin: 0 auto 42px; text-align: center; }
.section-heading.align-left { width: auto; margin: 0; text-align: left; }
.section-heading h2, .page-hero h1, .contact-inner h2 { margin-bottom: 16px; color: var(--navy); font-size: clamp(31px, 3vw, 46px); line-height: 1.15; letter-spacing: 0; }
.section-heading p:not(.section-kicker), .page-hero-lead { color: var(--muted); font-size: 17px; line-height: 1.85; }
.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: var(--paper); background: var(--navy); box-shadow: 0 12px 26px rgba(7, 27, 49, 0.16); }
.btn-secondary { border: 1px solid rgba(7, 27, 49, 0.18); color: var(--navy); background: rgba(255, 255, 255, 0.76); }
.text-link { display: inline-flex; width: fit-content; align-items: center; margin-top: auto; color: var(--navy); font-size: 14px; font-weight: 900; }
.text-link::after { width: 7px; height: 7px; margin-left: 8px; border-top: 2px solid currentColor; border-right: 2px solid currentColor; content: ""; transform: rotate(45deg); }
.card-link-cover { position: absolute; inset: 0; z-index: 1; border-radius: inherit; }
.empty-state { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; padding: 28px; border: 1px solid var(--line-soft); border-radius: var(--radius-md); color: var(--muted); background: var(--paper); text-align: center; }
.page-hero { padding: 154px 24px 84px; background: linear-gradient(180deg, #fff 0%, #fbfdff 62%, var(--mist) 100%); }
.page-hero-inner { width: min(960px, 100%); margin: 0 auto; text-align: center; }

.site-footer {
  display: flex;
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0;
  border-top: 1px solid var(--line);
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
}
.site-footer strong { color: var(--ink); }
.site-footer p { margin: 8px 0 0; color: var(--muted); }
.site-footer nav, .footer-menu { display: flex; flex-wrap: wrap; gap: 12px 18px; justify-content: flex-end; margin: 0; padding: 0; list-style: none; color: var(--muted); font-size: 14px; }

@media (max-width: 760px) {
  .nav-container { min-height: 72px; gap: 10px; padding: 0 16px; }
  .logo-area { flex: 1 1 auto; overflow: hidden; }
  .brand { flex: 1 1 auto; overflow: hidden; }
  .brand-mark { width: 54px; height: 36px; }
  .brand strong { max-width: min(210px, calc(100vw - 162px)); overflow: hidden; font-size: 14px; text-overflow: ellipsis; }
  .brand small { display: none; }
  .nav-toggle { display: block; flex: 0 0 auto; }
  .site-nav { position: fixed; top: 72px; right: 16px; width: min(330px, calc(100vw - 32px)); padding: 14px; border: 1px solid rgba(7, 27, 49, 0.1); border-radius: var(--radius-md); background: rgba(255, 255, 255, 0.96); box-shadow: var(--shadow-lift); opacity: 0; pointer-events: none; transform: translateY(-8px); transition: opacity 180ms ease, transform 180ms ease; }
  .site-nav.is-open { opacity: 1; pointer-events: auto; transform: translateY(0); }
  .site-nav .menu, .site-nav ul { display: grid; gap: 4px; }
  .site-nav a { display: block; padding: 12px 10px; border-radius: var(--radius-sm); }
  .site-nav .sub-menu { position: static; min-width: 0; padding: 4px 0 4px 12px; border: 0; box-shadow: none; opacity: 1; pointer-events: auto; transform: none; }
  .section { padding: 68px 0; }
  .section-heading { width: calc(100% - 32px); margin-bottom: 30px; }
  .section-heading h2, .page-hero h1, .contact-inner h2 { font-size: 30px; }
  .section-heading p:not(.section-kicker), .page-hero-lead { font-size: 15px; line-height: 1.78; }
  .page-hero { padding: 118px 16px 64px; }
  .site-footer { width: calc(100% - 32px); flex-direction: column; padding: 30px 0; }
  .site-footer nav, .footer-menu { justify-content: flex-start; }
}