/* ========================================
   导航栏 · Navigation v2.0
   暗色血金主题
   ======================================== */

.nav-primary {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 6, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
  height: var(--nav-height);
  transition: background 0.3s ease;
}
.nav-primary.scrolled {
  background: rgba(8, 6, 10, 0.95);
}

.nav-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-brand:hover { color: var(--c-gold); text-decoration: none; }

/* 品牌圆点脉冲 */
.nav-brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-blood);
  box-shadow: 0 0 12px var(--c-blood);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.8); }
}

.nav-menu {
  display: flex;
  gap: var(--sp-lg);
  align-items: center;
}

.nav-link {
  font-size: var(--fs-small);
  color: var(--c-text-sec);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  font-weight: 500;
}
.nav-link:hover {
  color: var(--c-text);
  background: var(--c-surface);
  text-decoration: none;
}
.nav-link.active {
  color: var(--c-blood-bright);
}

/* --- 汉堡菜单按钮 --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-sm);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  transition: transform var(--transition);
}

/* --- 面包屑 --- */
.breadcrumb {
  font-size: var(--fs-small);
  color: var(--c-text-muted);
  display: inline-block;
  margin-bottom: var(--sp-sm);
  transition: color var(--transition);
}
.breadcrumb:hover { color: var(--c-gold); text-decoration: none; }