/* EnergyPoint.AI · 源点返回导航样式 v1.0
 * 与 energy-point-nav.js 配套；无框架依赖。
 */
.epnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 44px;
  padding: 0 16px;
  background: rgba(5, 6, 7, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 13px;
  color: #a2a7ab;
  box-sizing: border-box;
}

.epnav * { box-sizing: border-box; }
.epnav a { color: inherit; text-decoration: none; }

.epnav-brand { flex-shrink: 0; min-width: 0; }

.epnav-brandname {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: #ffffff;
  font-weight: 600;
  white-space: nowrap;
}
.epnav-brandname:hover, .epnav-brandname:focus-visible { color: #18d9b4; outline: none; }

.epnav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  flex: 1 1 auto;
  min-width: 0;
}
.epnav-list::-webkit-scrollbar { display: none; }

.epnav-item {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 3px;
  white-space: nowrap;
  color: #a2a7ab;
  transition: color 0.15s ease-out, background-color 0.15s ease-out;
}

a.epnav-item:hover, a.epnav-item:focus-visible {
  color: #ffffff;
  background: rgba(24, 217, 180, 0.12);
  outline: none;
}

.epnav-item.is-current {
  color: #18d9b4;
  font-weight: 600;
  cursor: default;
}

.epnav-docs {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  padding-left: 12px;
  border-left: 1px solid rgba(255, 255, 255, 0.12);
}

.epnav-doclink {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: #6e7378;
  white-space: nowrap;
  transition: color 0.15s ease-out;
}

.epnav-doclink:hover, .epnav-doclink:focus-visible { color: #18d9b4; outline: none; }

@media (max-width: 640px) {
  .epnav { gap: 10px; padding: 0 10px; }
  .epnav-docs { display: none; }
  .epnav-brandname { font-size: 11px; }
}