/* ==============================================
   Component: Header — навигационная шапка
   ============================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding: var(--space-md) 0;
  animation: slideDown 0.6s var(--transition-slow) both;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-family-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  transition: opacity var(--transition-fast);
}

.header__logo:hover {
  opacity: 0.85;
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.header__logo-icon svg {
  width: 18px;
  height: 18px;
  color: var(--color-bg-primary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  position: relative;
  transition: color var(--transition-fast);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.header__nav-link:hover {
  color: var(--color-text-primary);
}

.header__nav-link:hover::after {
  width: 100%;
}

/* ── Мобильная адаптация ── */
@media (max-width: 640px) {
  .header__nav {
    display: none; /* Можно заменить на мобильное меню позже */
  }
}