.hub {
  display: flex; flex-direction: column; align-items: center;
  padding: 32px 20px 96px; /* 하단 탭바 높이만큼 여유 */
  max-width: 480px; margin: 0 auto;
}
.hub-title { font-size: 1.8rem; font-weight: 700; margin: 8px 0 28px; text-align: center; }
.theme-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; width: 100%; }
.theme-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; aspect-ratio: 1; border-radius: 24px;
  background: var(--card-bg); box-shadow: var(--shadow);
  border: none; color: var(--ink); cursor: pointer; text-decoration: none;
  -webkit-tap-highlight-color: transparent; transition: transform 0.15s ease;
}
.theme-card:active { transform: scale(0.95); }
.theme-emoji { font-size: 3rem; line-height: 1; }
.theme-label { font-size: 1.05rem; font-weight: 700; }

.hub-screen { min-height: 60dvh; }
.hub-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 60dvh; gap: 12px; text-align: center; color: var(--muted);
}
.hub-placeholder-emoji { font-size: 3.4rem; }

#tab-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: flex;
  background: var(--card-bg);
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.35);
  padding-bottom: env(safe-area-inset-bottom);
}
.fgh-tab {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 10px 0; background: none; border: none; cursor: pointer;
  color: var(--muted); font: inherit;
}
.fgh-tab[aria-selected="true"] { color: var(--ink); }
.fgh-tab svg { width: 22px; height: 22px; }
.fgh-tab-lbl { font-size: 0.72rem; font-weight: 700; }