/* ArkRecode Tools — shared design tokens */
:root {
  --brand-bg:      #080D18;
  --brand-surface: #0F1628;
  --brand-border:  #1e293b;
  --brand-accent:  #3B82F6;
  --brand-text:    #e2e8f0;
  --brand-muted:   #94a3b8;
  --brand-radius:  12px;
}

/* Shared sticky top-bar */
.arkrecode-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8,13,24,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--brand-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  font-family: 'Noto Sans TC', system-ui, sans-serif;
}
.arkrecode-header .logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--brand-text);
}
.arkrecode-header .logo-icon { font-size: 22px; }
.arkrecode-header .logo-text {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}
.arkrecode-header .logo-sub {
  font-size: 11px;
  color: var(--brand-muted);
}
.arkrecode-header .header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}
.arkrecode-header .lang-btn {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid var(--brand-border);
  background: transparent;
  color: var(--brand-muted);
  transition: all 0.15s;
}
.arkrecode-header .lang-btn.active,
.arkrecode-header .lang-btn:hover {
  background: var(--brand-accent);
  border-color: var(--brand-accent);
  color: #fff;
}