/* ============================================================
 * Nav — 顶部导航
 * ============================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav, 100);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--color-border, #E5E5E0);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3, 12px);
  padding-bottom: var(--space-3, 12px);
  gap: var(--space-4, 16px);
}

.nav__brand {
  font-family: var(--font-display);
  font-size: var(--fs-md, 18px);
  font-weight: 700;
  color: var(--color-primary, #2D5016);
  white-space: nowrap;
}

.nav__toggle {
  display: none;
  font-size: 24px;
  color: var(--color-primary, #2D5016);
  padding: var(--space-2, 8px) var(--space-3, 12px);
  border-radius: var(--radius-sm, 4px);
}
.nav__toggle:hover {
  background: var(--color-bg-soft, #F0EDE3);
}

.nav__list {
  display: flex;
  gap: var(--space-1, 4px);
  align-items: center;
  flex-wrap: wrap;
}

.nav__list a {
  padding: var(--space-2, 8px) var(--space-3, 12px);
  font-size: var(--fs-sm, 14px);
  color: var(--color-text-muted, #6B7B6C);
  border-radius: var(--radius-sm, 4px);
  transition: all var(--duration-fast, 150ms) var(--ease, ease);
  white-space: nowrap;
}

.nav__list a:hover {
  color: var(--color-primary, #2D5016);
  background: var(--color-bg-soft, #F0EDE3);
}

.nav__list a.nav__link--active {
  color: var(--color-primary, #2D5016);
  font-weight: 600;
  background: var(--color-bg-soft, #F0EDE3);
}

/* ---------- Mobile ---------- */
@media (max-width: 768px) {
  .nav__inner {
    position: relative;
  }
  .nav__toggle {
    display: block;
    order: 2;
  }
  .nav__list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3, 12px);
    background: var(--color-bg-card, #fff);
    border-top: 1px solid var(--color-border, #E5E5E0);
    box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.08));
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }
  .nav__list--open { display: flex; }
  .nav__list a {
    width: 100%;
    padding: var(--space-3, 12px);
  }
}