/* 操作手册基础壳层 — 与官网视觉统一 */
:root {
  --primary-color: #2de2c5;
  --primary-dark: #1bb8a4;
  --text-primary: #e8f2f7;
  --text-secondary: #8aa0b0;
  --bg-primary: #071018;
  --bg-secondary: #0c1622;
  --bg-card: #0e1c2a;
  --border-color: rgba(130, 210, 230, 0.14);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Sora", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(7, 16, 24, 0.9);
  backdrop-filter: blur(12px);
  z-index: 1000;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-color);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-primary);
  font-weight: 700;
  text-decoration: none;
}

.nav-brand img {
  height: 42px;
  width: auto;
  max-width: 130px;
  border-radius: 8px;
  object-fit: contain;
  background: #fff;
  padding: 3px 6px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

@media (max-width: 720px) {
  .nav-menu { gap: 0.75rem; flex-wrap: wrap; justify-content: flex-end; }
}