<div class="tabs">
  <div class="tab-list" role="tablist">
    <button class="tab active" role="tab">Genel</button>
    <button class="tab" role="tab">Security</button>
    <button class="tab" role="tab">Bildirimler</button>
  </div>
  <div class="tab-panel">Content here</div>
</div>

<style>
.tab-list {
  display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem;
}
.tab {
  padding: 0.625rem 1.25rem; font-size: 0.875rem; color: var(--muted);
  border: none; background: none; cursor: pointer; position: relative;
  transition: color 0.15s;
}
.tab::after {
  content: ''; position: absolute; bottom: -1px; left: 0; right: 0;
  height: 2px; background: var(--accent); opacity: 0; transition: opacity 0.15s;
}
.tab.active { color: var(--text); }
.tab.active::after { opacity: 1; }
</style>