/* ── §5.16 rev2 하단 탭바 — P3.2 ──────────────────────────────────
   의존: tokens.css (vars)
   마크업: index.html <nav class="tab-bar"> (홈/작업실/글쓰기 FAB/대시보드/마무리)
   활성 클래스: .is-active (과도기 .active 병행 — Commit 5에서 단일화)
   ────────────────────────────────────────────────────────────── */

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr 72px 1fr 1fr;
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 200;
}

.tab-bar__btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 4px 8px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-subtle);
  font-size: 11px;
  font-weight: 600;
  transition: color 0.15s;
  min-height: 56px;
  position: relative;
  font-family: inherit;
}

.tab-bar__icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
}

.tab-bar__label {
  font-size: 11px;
  line-height: 1;
}

/* 활성 상태 — app-core.js showTab() 이 .active 를 토글 */
.tab-bar__btn.active {
  color: var(--brand);
}

.tab-bar__btn.active::before {
  content: '';
  position: absolute;
  top: 6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--brand);
}

/* 중앙 FAB (글쓰기) */
.tab-bar__fab {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: -12px auto 0;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  box-shadow: var(--shadow-brand);
  color: #fff;
  cursor: pointer;
  transition: transform 0.1s;
  place-self: center center;
}

.tab-bar__fab:active {
  transform: scale(.94);
}

.tab-bar__fab.active {
  outline: 2px solid var(--brand-bg);
  outline-offset: 2px;
}

.tab-bar__fab svg {
  stroke: currentColor;
  fill: none;
}

/* 다크모드 — 토큰이 자동 적용되지만 border-top 가시성 보강 */
html[data-theme="dark"] .tab-bar {
  border-top-color: rgba(255, 255, 255, 0.08);
}