/* ==========================================================================
   Component: Header
   .header — top navigation bar for the trading terminal.
   ========================================================================== */

/* ---------------------------------------------------------------------------
   Header Container
   --------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  height: var(--header-height);
  padding: 0 var(--space-4);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-muted);
  gap: var(--space-3);
  overflow: hidden;
}

/* ---------------------------------------------------------------------------
   Logo / Brand
   --------------------------------------------------------------------------- */
.header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  text-decoration: none;
  color: var(--text-primary);
}

.header__logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.header__brand-name {
  font-size: var(--text-md);
  font-weight: var(--weight-bold);
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ---------------------------------------------------------------------------
   Sidebar Toggle (mobile)
   --------------------------------------------------------------------------- */
.header__menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.header__menu-toggle:hover {
  color: var(--text-primary);
  background-color: var(--bg-elevated);
}

/* Hide on tablet+ where sidebar is always visible */
@media (min-width: 768px) {
  .header__menu-toggle {
    display: none;
  }
}

/* ---------------------------------------------------------------------------
   Navigation / Center area
   --------------------------------------------------------------------------- */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: var(--space-4);
}

.header__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

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

.header__nav-link.is-active {
  color: var(--accent);
  background-color: var(--accent-subtle);
}

/* Hide nav on mobile */
@media (max-width: 767px) {
  .header__nav {
    display: none;
  }
}

/* ---------------------------------------------------------------------------
   Spacer — pushes right-side actions to the end
   --------------------------------------------------------------------------- */
.header__spacer {
  flex: 1;
}

/* ---------------------------------------------------------------------------
   Right-side Actions
   --------------------------------------------------------------------------- */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ---------------------------------------------------------------------------
   Connection Status
   --------------------------------------------------------------------------- */
.header__status {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.header__status-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background-color: var(--color-error);
  flex-shrink: 0;
}

.header__status-dot.is-connected {
  background-color: var(--color-success);
  animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

/* ---------------------------------------------------------------------------
   Wallet display
   --------------------------------------------------------------------------- */
.header__wallet {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-md);
}

.header__wallet-balance {
  color: var(--accent);
  font-weight: var(--weight-semibold);
}

/* Hide wallet address on small screens */
@media (max-width: 480px) {
  .header__wallet-address {
    display: none;
  }
}

/* ---------------------------------------------------------------------------
   Reduced motion
   --------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .header__status-dot.is-connected {
    animation: none;
  }
}