/* ==========================================================================
   SKELETON LOADING — NihongoDo
   PERF-03: State loading skeleton agar UI tidak kosong saat fetch data.
   Dipakai di home dashboard dan halaman lain yang memuat data async.
   ========================================================================== */

/* Animasi shimmer global */
@keyframes skel-shimmer {
  0% {
    background-position: -400px 0;
  }
  100% {
    background-position: 400px 0;
  }
}

/* Gradient shimmer yang dipakai semua elemen skeleton */
.skel-bar,
.skel-num,
.skel-card,
.skel-card-sm,
.skel-circle,
.skel-text {
  background: linear-gradient(90deg, var(--ink-3) 25%, var(--ink-4) 50%, var(--ink-3) 75%);
  background-size: 800px 100%;
  animation: skel-shimmer 1.4s infinite linear;
  border-radius: var(--radius-xs);
  display: block;
}

/* ─── Batang teks ─────────────────────────────────────────── */
.skel-bar {
  height: 14px;
  margin-bottom: 10px;
  border-radius: var(--radius-xs);
}
.skel-bar:last-child {
  margin-bottom: 0;
}

/* ─── Angka besar (stats) ─────────────────────────────────── */
.skel-num {
  display: inline-block;
  width: 48px;
  height: 28px;
  vertical-align: middle;
  border-radius: var(--radius-xs);
}

/* ─── Kartu placeholder ───────────────────────────────────── */
.skel-card {
  background: none; /* reset — kartu pakai ink-2 */
  animation: none;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: var(--ink-2);
}
.skel-card .skel-bar {
  /* Pastikan bar di dalam kartu punya shimmer */
  background: linear-gradient(90deg, var(--ink-3) 25%, var(--ink-5) 50%, var(--ink-3) 75%);
  background-size: 800px 100%;
  animation: skel-shimmer 1.4s infinite linear;
}

/* ─── Kartu kecil (kana grid) ─────────────────────────────── */
.skel-card-sm {
  height: 64px;
  border-radius: var(--radius-sm);
}

/* ─── Lingkaran (avatar, ikon) ────────────────────────────── */
.skel-circle {
  border-radius: 50%;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

/* ─── Teks inline ─────────────────────────────────────────── */
.skel-text {
  height: 12px;
  display: inline-block;
}

/* ─── Grid skeleton (kana / kanji / vocab) ────────────────── */
.skel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(82px, 1fr));
  gap: var(--space-2);
}
.skel-grid .skel-card-sm {
  width: 100%;
}

/* ─── Lesson list skeleton ────────────────────────────────── */
.skel-lesson-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--ink-2);
  margin-bottom: var(--space-2);
}
.skel-lesson-item .skel-circle {
  width: 36px;
  height: 36px;
}
.skel-lesson-item .skel-lines {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ─── Aksesibilitas: hentikan animasi jika user prefer reduced-motion ── */
@media (prefers-reduced-motion: reduce) {
  .skel-bar,
  .skel-num,
  .skel-card-sm,
  .skel-circle,
  .skel-text,
  .skel-card .skel-bar {
    animation: none;
    background: var(--ink-4);
    background-image: none;
  }
}