.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  background: #1a56db;
  color: white;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  position: sticky;
  top: 0;
  z-index: 100;
}

.title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.nav {
  display: flex;
  gap: 8px;
}

.navBtn {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: white;
  padding: 6px 16px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s;
}

.navBtn:hover {
  background: rgba(255,255,255,0.25);
}

.navBtn.active {
  background: white;
  color: #1a56db;
  border-color: white;
}

.main {
  flex: 1;
  overflow: hidden;
}