/* B70 官方头栏（紧凑版，与 tools/index.html 尺寸一致） */
.top-nav {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 9px 16px;
  background: linear-gradient(135deg, #fffdf0 0%, #ffffff 55%, #fdf6d8 100%);
  border: 1px solid #f0e3b8;
  border-bottom: 3px solid #ffe400;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(21, 18, 14, .06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  box-sizing: border-box;
}
.top-nav .brand {
  display: inline-block;
  padding: 0;
  margin: 0;
  font-size: 15px;
  color: #15120e;
  font-weight: 800;
  letter-spacing: .5px;
  white-space: nowrap;
}
.top-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.top-nav .nav-links a {
  display: inline-block;
  margin: 0;
  box-sizing: border-box;  margin: 0;
  display: inline-block; /* 防页面全局 a 样式 */
  font-size: 13px;
  padding: 6px 12px;
  min-width: 104px;
  text-align: center;
  border-radius: 100px;
  color: #555;
  background: transparent;
  font-weight: 500;
}
.top-nav .nav-links a.active {
  color: #15120e;
  background: #ffe400;
  font-weight: 700;
}

@media (max-width:480px){
.top-nav{padding:6px 8px;gap:6px;border-radius:12px;flex-wrap:nowrap;}
.top-nav .brand{font-size:14px;flex-shrink:0;}
.top-nav .nav-links{flex:1;min-width:0;gap:4px;flex-wrap:nowrap;justify-content:space-between;}
.top-nav .nav-links a{font-size:12px;padding:5px 4px;min-width:0;flex:1;white-space:nowrap;}
}