:root {
  --pink-bar: #f6b8c4;      /* header, sedikit lebih pekat */
  --pink-soft: #fbd7dd;     /* kartu & tombol */
  --pink-hover: #f9c6ce;
  --pink-press: #f2aebb;
  --ink: #1a1a1a;
  --white: #ffffff;
  --shadow: 0 8px 24px rgba(224, 122, 145, 0.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

/* Perbaikan bug: attribute [hidden] harus benar-benar menyembunyikan,
   walaupun elemen punya display flex/grid dari class-nya */
[hidden] { display: none !important; }

body {
  font-family: 'Fredoka', system-ui, sans-serif;
  color: var(--ink);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  /* Background pastel bermotif: gradasi lembut + pola bulatan (sakura vibe) */
  background-color: #fff5f7;
  background-image:
    radial-gradient(circle at 12% 20%, rgba(249, 197, 206, 0.4) 0, transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(255, 214, 224, 0.45) 0, transparent 40%),
    radial-gradient(circle at 78% 82%, rgba(249, 197, 206, 0.38) 0, transparent 45%),
    radial-gradient(circle at 20% 88%, rgba(255, 224, 230, 0.42) 0, transparent 42%),
    radial-gradient(rgba(246, 184, 196, 0.18) 1.4px, transparent 1.4px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 100% 100%, 26px 26px;
  background-attachment: fixed;
}

/* Garis lengkung dekoratif seperti ombak lembut di latar */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(120% 60% at 50% -10%, rgba(255, 255, 255, 0.55) 0, transparent 60%),
    radial-gradient(100% 50% at 50% 110%, rgba(246, 184, 196, 0.22) 0, transparent 60%);
}

/* ===== Kelopak sakura melayang ===== */
.sakura-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.petal {
  position: absolute;
  top: -40px;
  width: 16px;
  height: 16px;
  background: radial-gradient(circle at 30% 30%, #ffd9e2, #f6a8bc);
  border-radius: 80% 0 80% 0;
  opacity: .7;
  animation: fall linear infinite;
}
@keyframes fall {
  0%   { transform: translateY(-40px) translateX(0) rotate(0deg); opacity: 0; }
  10%  { opacity: .75; }
  100% { transform: translateY(105vh) translateX(60px) rotate(360deg); opacity: .2; }
}

/* Semua konten di atas hiasan latar + logika tampil/sembunyi layar */
.screen { display: none; flex: 1; position: relative; z-index: 1; }
.screen.active { display: flex; }

/* Kurangi hiasan gerak buat yang sensitif animasi */
@media (prefers-reduced-motion: reduce) {
  .petal { animation: none; display: none; }
}

/* ===== MENU ===== */
#menu { align-items: center; justify-content: center; padding: 48px 20px calc(40px + env(safe-area-inset-bottom, 0px)); }
.menu-wrap {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}
.title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 2px;
}
.subtitle {
  font-size: 1rem;
  font-weight: 400;
  text-align: center;
  color: #6b5b5e;
  line-height: 1.5;
  margin-bottom: 14px;
}

/* ===== Tombol umum ===== */
.btn {
  font-family: inherit;
  font-weight: 600;
  color: var(--ink);
  background: var(--pink-soft);
  border: none;
  border-radius: 26px;
  cursor: pointer;
  transition: transform .12s ease, background .2s ease, box-shadow .2s ease;
  box-shadow: var(--shadow);
}
.btn:hover { background: var(--pink-hover); transform: translateY(-2px); }
.btn:active { background: var(--pink-press); transform: translateY(0); }

.menu-btn {
  width: 100%;
  padding: 22px 16px;
  font-size: 1.35rem;
  letter-spacing: .5px;
}

/* ===== STUDY ===== */
#study { flex-direction: column; align-items: center; justify-content: flex-start; padding: calc(24px + env(safe-area-inset-top, 0px)) 20px calc(28px + env(safe-area-inset-bottom, 0px)); }
.study-wrap {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  flex: 1;
}
.study-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.back-btn {
  font-family: inherit;
  font-weight: 500;
  font-size: .95rem;
  background: transparent;
  border: none;
  color: #b56072;
  cursor: pointer;
  padding: 6px 4px;
}
.back-btn:hover { color: #8f4655; }
.mode-label {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 1px;
  color: var(--ink);
}
.counter {
  font-size: .9rem;
  font-weight: 500;
  color: #9a8a8d;
  min-width: 56px;
  text-align: right;
}

/* ===== Kartu (tanpa flip) ===== */
.card {
  width: 100%;
  max-width: 400px;
  background: var(--pink-soft);
  border-radius: 34px;
  box-shadow: var(--shadow);
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 240px;
  margin: auto 0;
  animation: pop .25s ease;
}
@keyframes pop {
  from { opacity: 0; transform: scale(.96); }
  to   { opacity: 1; transform: scale(1); }
}
.card-char {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 500;
  font-size: clamp(3rem, 13vw, 5.5rem);
  line-height: 1.25;
  text-align: center;
  color: var(--ink);
  word-break: break-word;
  max-width: 100%;
}
.card-divider {
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: rgba(181, 96, 114, 0.35);
}
.card-romaji {
  font-size: clamp(1.6rem, 7vw, 2.4rem);
  font-weight: 600;
  color: #a44f62;
  text-align: center;
}
.card-extra {
  font-size: clamp(1rem, 4.5vw, 1.35rem);
  font-weight: 400;
  color: #6b5b5e;
  text-align: center;
}
.card-extra:empty { display: none; }

/* ===== Navigasi ===== */
.nav {
  width: 100%;
  display: flex;
  gap: 16px;
}
.nav-btn {
  flex: 1;
  padding: 18px 12px;
  font-size: 1.1rem;
}
.nav-btn:disabled {
  opacity: .45;
  cursor: default;
  transform: none;
  box-shadow: none;
}

/* ===== Tombol Lihat Semua ===== */
.toggle-btn {
  align-self: center;
  padding: 12px 24px;
  font-size: 1rem;
  border-radius: 20px;
}

/* ===== Grid semua huruf ===== */
.grid-wrap {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 12px;
  animation: pop .25s ease;
}
.grid-item {
  background: var(--pink-soft);
  border-radius: 18px;
  padding: 14px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 4px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform .12s ease, background .2s ease;
}
.grid-item:hover { background: var(--pink-hover); transform: translateY(-2px); }
.grid-item:active { background: var(--pink-press); }
.grid-char {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 500;
  font-size: 1.4rem;
  line-height: 1.2;
  color: var(--ink);
  text-align: center;
  word-break: break-word;
  max-width: 100%;
}
/* Huruf tunggal (hiragana/katakana/angka) tetap besar */
.grid-item.single .grid-char { font-size: 2rem; }
.grid-romaji {
  font-size: .82rem;
  font-weight: 600;
  color: #a44f62;
  text-align: center;
  word-break: break-word;
  max-width: 100%;
}
.grid-extra {
  font-size: .7rem;
  font-weight: 400;
  color: #6b5b5e;
  text-align: center;
  line-height: 1.25;
}
.grid-extra:empty { display: none; }

/* ===== Responsif ===== */
@media (max-width: 480px) {
  .title { font-size: 1.6rem; }
  .menu-btn { padding: 18px 14px; font-size: 1.2rem; }
  .card { padding: 28px 18px; border-radius: 28px; min-height: 200px; max-width: 320px; gap: 12px; }
  #study { padding: calc(20px + env(safe-area-inset-top, 0px)) 16px calc(24px + env(safe-area-inset-bottom, 0px)); }
}

@media (min-width: 700px) {
  .card { min-height: 300px; max-width: 420px; }
}