/* ==========================================================================
   BOTTOM NAVIGATION — NihongoDo (khusus mobile)
   5 tab utama: Home, Belajar, Ulasan, Kamus, Profil.
   Hanya tampil di layar ≤ 768px; desktop pakai Navbar horizontal biasa.
   ========================================================================== */

.bottom-nav {
  display: none; /* aktifkan via media query di responsive.css */

  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: calc(var(--z-header) + 5);

  background: var(--color-surface);
  border-top: 1px solid var(--border);
  box-shadow: var(--shadow-nav);

  /* Tata letak 5 tab rata penuh */
  grid-template-columns: repeat(5, 1fr);
  align-items: stretch;

  /* Safe-area untuk iPhone home indicator */
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* ─── ITEM TAB ───────────────────────────────────────────── */
.bn-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 8px 4px 6px;
  color: var(--text-faint);
  text-decoration: none;
  font-size: 10px;
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: 0.01em;
  transition:
    color var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease);
  /* Area klik yang lebih besar */
  min-height: 52px;
  position: relative;
  cursor: pointer;
  background: none;
  border: none;
}

.bn-item:hover,
.bn-item:focus-visible {
  color: var(--text-soft);
  background: var(--ink-3);
  text-decoration: none;
}

.bn-item:focus-visible {
  outline: 2px solid var(--indigo-light);
  outline-offset: -2px;
  border-radius: var(--radius-xs);
}

/* Tab aktif */
.bn-item.active {
  color: var(--shu-light);
}

/* Garis indikator atas (aktif) */
.bn-item.active::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--shu);
  border-radius: 0 0 var(--radius-xs) var(--radius-xs);
}

/* ─── IKON TAB (aksara Jepang + emoji fallback) ──────────── */
.bn-icon {
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1;
  transition: transform var(--dur-fast) var(--ease);
  display: block;
}

.bn-item.active .bn-icon {
  transform: translateY(-1px);
}

.bn-item:active .bn-icon {
  transform: scale(0.88);
}

/* ─── LABEL ──────────────────────────────────────────────── */
.bn-label {
  font-size: 9.5px;
  white-space: nowrap;
  line-height: 1;
}

/* ─── BADGE NOTIFIKASI ───────────────────────────────────── */
.bn-badge {
  position: absolute;
  top: 6px;
  /* Posisi relatif ikon — ditengahkan sedikit ke kanan ikon */
  left: calc(50% + 6px);
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  background: var(--shu);
  color: var(--washi);
  font-size: 9px;
  font-family: var(--font-mono);
  font-weight: 700;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  pointer-events: none;
}

.bn-badge:empty,
.bn-badge[data-count="0"] {
  display: none;
}

/* ─── TEMA TERANG ────────────────────────────────────────── */
/* Light theme: --shadow-nav sudah di-override di themes/light.css */
[data-theme="light"] .bottom-nav {
  background: var(--color-surface);
  border-top-color: var(--border);
  box-shadow: var(--shadow-nav);
}