.shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 46px;
  height: 46px;
  filter: drop-shadow(0 0 14px rgba(36, 209, 255, 0.35));
}

.brand-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.nav { display: flex; gap: 10px; }

.main { display: grid; gap: 20px; }

.view { display: none; }
.view.active { display: block; }

@media (max-width: 860px) {
  .input-row { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .provider-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .grid { grid-template-columns: 1fr; }
  .brand-sub { display: none; }
}