/* Header / Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(9, 9, 11, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 100;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
}

.header-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-logo-icon svg {
  width: 18px;
  height: 18px;
  color: white;
}

.header-logo-text {
  font-size: 1.125rem;
  font-weight: 600;
}

.header-logo-text span {
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-auth {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-user {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.header-user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-primary);
  text-transform: uppercase;
}

.header-btn {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.header-btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.header-btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.header-btn-primary {
  background: var(--accent);
  color: white;
}

.header-btn-primary:hover {
  background: var(--accent-hover);
}