/* 统一顶栏样式 */
header.head {
  width: 100%;
  left: 0;
  right: 0;
  box-sizing: border-box;
  justify-content: space-between;
  flex-wrap: nowrap;
  gap: 1rem;
  padding: 1rem 2.5rem;
  transition: background 0.3s, box-shadow 0.3s, color 0.3s;
}

header.head .logo {
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}

header.head .main-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  min-width: 0;
}

header.head .main-nav ul {
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
}

header.head .main-nav a {
  color: inherit;
  white-space: nowrap;
}

header.head .main-nav a:hover {
  color: var(--accent);
}

/* 首页：透明顶栏浮在 Banner 上 */
body.home-page header.head {
  background: transparent;
}

body.home-page header.head .main-nav a,
body.home-page header.head .logo,
body.home-page header.head .nav-toggle {
  color: #fff;
}

body.home-page header.head.scrolled {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

body.home-page header.head.scrolled .main-nav a,
body.home-page header.head.scrolled .logo,
body.home-page header.head.scrolled .nav-toggle {
  color: #000;
}

body.home-page header.head.scrolled .main-nav a:hover {
  color: var(--primary);
}

/* 内页：固定白底顶栏 */
body.subpage header.head {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

body.subpage header.head .main-nav a,
body.subpage header.head .logo,
body.subpage header.head .nav-toggle {
  color: #222;
}

body.subpage header.head .main-nav a:hover {
  color: var(--primary);
}

body.subpage {
  padding-top: 88px;
}

@media (max-width: 768px) {
  header.head {
    padding: 0.85rem 1.2rem;
  }

  body.subpage {
    padding-top: 72px;
  }

  header.head .main-nav ul {
    gap: 0;
    margin-left: 0;
    width: calc(100% - 2.4rem);
  }
}