:root {
  --deep: #0b4f7a;
  --sea: #1f86b8;
  --shallow: #7fd3e8;
  --sand: #f6e7c8;
  --pink: #f06aa6;
  --pink-soft: #ffd1e4;
  --ink: #2f2346;
  --card: #fffaf3;
  --gold: #ffc83d;
  --pad: min(72vw, 52vh);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  font-family: ui-rounded, "SF Pro Rounded", system-ui, -apple-system, sans-serif;
  color: var(--ink);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

html { background: var(--deep); }

/* The ocean behind every screen */
#sea {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(120% 60% at 50% -10%, rgba(255,255,255,.35), transparent 60%),
    linear-gradient(180deg, var(--top, var(--shallow)) 0%, var(--mid, var(--sea)) 45%, var(--deep) 100%);
  transition: background .6s;
  z-index: -1;
}
#sea::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 9vh;
  background: var(--sandc, var(--sand));
  border-radius: 50% 50% 0 0 / 30% 30% 0 0;
}
.bubble {
  position: fixed;
  bottom: -40px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.7);
  background: rgba(255,255,255,.15);
  pointer-events: none;
  animation: rise linear forwards;
  z-index: 5;
}
@keyframes rise {
  to { transform: translate(var(--drift, 0), -115vh); opacity: .2; }
}

.screen {
  position: fixed;
  inset: 0;
  padding: calc(12px + var(--safe-top)) 16px calc(12px + var(--safe-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}
[hidden] { display: none !important; }

button {
  font: inherit;
  color: inherit;
  border: 0;
  cursor: pointer;
  touch-action: manipulation;
}
.round {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--card);
  font-size: 28px;
  box-shadow: 0 4px 0 rgba(0,0,0,.18);
  display: grid; place-items: center;
  flex: none;
}
.round.big { width: 72px; height: 72px; font-size: 36px; }
.round span, .pill span[data-icon] { display: grid; place-items: center; }
.round svg { width: 30px; height: 30px; color: var(--ink); }
.round.big svg { width: 38px; height: 38px; }
.pill svg { width: 30px; height: 30px; }
.pill.small svg { width: 20px; height: 20px; }
.book-title svg { width: 34px; height: 34px; display: block; }
.round.small { width: 48px; height: 48px; font-size: 22px; }
.round:active, .pill:active { transform: translateY(3px); box-shadow: 0 1px 0 rgba(0,0,0,.18); }

.pill {
  min-height: 64px;
  padding: 0 28px;
  border-radius: 999px;
  background: var(--card);
  font-size: 28px;
  font-weight: 700;
  box-shadow: 0 4px 0 rgba(0,0,0,.18);
  display: inline-flex; align-items: center; gap: 10px;
}
.pill.go { background: var(--pink); color: #fff; }
.pill.small { min-height: 44px; font-size: 17px; padding: 0 18px; }
.pill.danger { background: #fff; color: #b3261e; border: 2px solid #b3261e; }

/* ---------- Home ---------- */
.home-head { display: flex; align-items: center; gap: 12px; color: #fff; }
.home-head h1 { margin: 0; font-size: clamp(28px, 6vw, 44px); text-shadow: 0 2px 0 rgba(0,0,0,.2); }
.guide { width: 96px; height: 72px; flex: none; animation: glide 4s ease-in-out infinite; }
.guide.big { width: min(60vw, 280px); height: auto; aspect-ratio: 4 / 3; margin: 0 auto; }
.guide svg { width: 100%; height: 100%; overflow: visible; }
@keyframes glide {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-8px) rotate(3deg); }
}
.guide.happy { animation: flip 0.9s ease-in-out 2, glide 4s ease-in-out 1.8s infinite; }
@keyframes flip {
  0% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-30px) rotate(-12deg) scale(1.1); }
  100% { transform: translateY(0) rotate(0); }
}

/* The aquarium: creatures she has won swim anywhere on the screen, over everything, without blocking taps */
#aquarium { position: fixed; inset: 0; pointer-events: none; z-index: 4; overflow: hidden; }
.swimmer {
  position: absolute; left: 0; top: 0;
  width: 72px; height: 72px;
  transition-property: transform; transition-timing-function: ease-in-out;
  filter: drop-shadow(0 4px 2px rgba(0,0,0,.18));
}
.swimmer .body { width: 100%; height: 100%; transition: transform .4s; animation: bob 1.6s ease-in-out infinite; }
.swimmer.flip .body { transform: scaleX(-1); }
.swimmer svg { width: 100%; height: 100%; display: block; }
@keyframes bob { 50% { translate: 0 -5px; } }
.empty-bubble { display: inline-block; width: 30px; height: 30px; border-radius: 50%; border: 3px solid rgba(255,255,255,.6); background: rgba(255,255,255,.12); }

/* Plants and rocks along the sea floor, different for each category */
#plants { position: fixed; left: 0; right: 0; bottom: 5vh; height: 26vh; z-index: -1; pointer-events: none; }
#plants svg { width: 100%; height: 100%; display: block; }

/* Home: one tile per category */
.cats {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(200px, 42vw), 1fr));
  gap: 16px;
  align-content: start;
  padding: 4px 2px 20px;
}
.cat {
  position: relative;
  border-radius: 28px;
  padding: 14px 10px 12px;
  background: linear-gradient(180deg, var(--mid) 0%, var(--bot) 100%);
  box-shadow: 0 6px 0 rgba(0,0,0,.18);
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  color: #fff;
}
.cat-creature {
  width: clamp(70px, 16vw, 104px); aspect-ratio: 1;
  background: #fff; border-radius: 50%;
  display: grid; place-items: center;
  box-shadow: 0 4px 0 rgba(0,0,0,.12);
  margin-bottom: 6px;
}
.cat-creature svg { width: 80%; height: 80%; }
.cat-zh { font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif; font-size: clamp(22px, 5vw, 30px); font-weight: 600; text-shadow: 0 2px 0 rgba(0,0,0,.2); }
.cat-name { font-size: clamp(13px, 3.2vw, 16px); font-weight: 700; text-shadow: 0 1px 0 rgba(0,0,0,.25); }
.cat-stars, .word-stars { display: flex; justify-content: center; gap: 2px; }
.cat-stars i, .word-stars i { width: clamp(18px, 4.5vw, 26px); height: clamp(18px, 4.5vw, 26px); }
.cat-stars i svg, .word-stars i svg { width: 100%; height: 100%; display: block; }
.cat-stars i:not(.on) svg, .word-stars i:not(.on) svg { filter: grayscale(1) opacity(.35); }
.cat.locked { filter: grayscale(.85); opacity: .6; }
.cat .lock { position: absolute; top: 10px; right: 12px; width: 28px; height: 28px; color: #fff; }
.cat .lock svg { width: 100%; height: 100%; display: block; }

/* A category page: its characters in order */
.world-title { display: flex; flex-direction: column; align-items: center; line-height: 1.1; text-shadow: 0 2px 0 rgba(0,0,0,.2); }
.world-title span { font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif; font-size: 30px; }
.world-title small { font-size: 15px; font-weight: 700; }
.words {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(120px, 25vw), 1fr));
  gap: 14px;
  align-content: start;
  padding: 4px 2px 20px;
  position: relative; z-index: 5;
}
.word {
  position: relative;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, #fff 0%, #f4fbff 40%, #d6eef8 100%);
  box-shadow: inset -6px -8px 0 rgba(11,79,122,.10), 0 6px 0 rgba(0,0,0,.15);
  display: grid; place-items: center;
  font-size: clamp(40px, 10vw, 58px);
  font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
  color: var(--ink);
}
.word .word-stars { position: absolute; bottom: 10%; left: 0; right: 0; }
.word .word-stars i { width: clamp(14px, 3.4vw, 20px); height: clamp(14px, 3.4vw, 20px); }
.word.got { box-shadow: inset -6px -8px 0 rgba(11,79,122,.10), 0 0 0 4px var(--gold), 0 6px 0 rgba(0,0,0,.15); }

.home-nav { display: flex; justify-content: space-between; align-items: end; }
.hold { position: relative; }
.hold > svg { position: absolute; inset: -4px; width: calc(100% + 8px); height: calc(100% + 8px); transform: rotate(-90deg); }
.hold > svg circle { fill: none; stroke: var(--pink); stroke-width: 3; stroke-dasharray: 101; stroke-dashoffset: 101; }
.hold.holding > svg circle { transition: stroke-dashoffset 3s linear; stroke-dashoffset: 0; }

/* ---------- Practice ---------- */
.bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: #fff; }
.bar h2 { margin: 0; font-size: 26px; }
.bar .spacer { width: 56px; }
.dots { display: flex; gap: 10px; }
.dots i { width: 16px; height: 16px; border-radius: 50%; background: rgba(255,255,255,.35); }
.dots i.on { background: #fff; }
.dots i.done { background: var(--gold); }

.stage {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.card {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  background: #fff;
  border-radius: 28px;
  padding: 16px 20px 12px;
  box-shadow: 0 5px 0 rgba(0,0,0,.15);
  min-width: 0;
}
.picture { width: clamp(110px, 22vh, 200px); aspect-ratio: 1; }
.picture svg { display: block; width: 100%; height: 100%; }
.card-char { font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif; font-size: clamp(34px, 5.5vh, 48px); line-height: 1.15; }
.card-meaning { font-size: 17px; font-weight: 600; color: #5b6b7a; }
.pinyin { font-size: 20px; font-weight: 700; color: var(--deep); }
.ladder { display: flex; gap: 4px; }
.ladder i { width: 14px; height: 6px; border-radius: 3px; background: #e3dbe9; }
.ladder i.on { background: var(--gold); }

.pads { display: flex; gap: 16px; align-items: center; justify-content: center; }
.pad {
  position: relative;
  width: var(--pad); height: var(--pad);
  background-color: #fff;
  border-radius: 18px;
  box-shadow: 0 6px 0 rgba(0,0,0,.15);
  touch-action: none;
  /* 田字格: border plus dashed middle lines */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Crect x='2' y='2' width='96' height='96' fill='none' stroke='%23f2a7c6' stroke-width='1.2'/%3E%3Cpath d='M50 2V98M2 50H98' stroke='%23f2a7c6' stroke-width='.8' stroke-dasharray='3 3'/%3E%3C/svg%3E");
  background-size: 100% 100%;
}
.pad.wobble, .cat.wobble { animation: wobble .4s; }
@keyframes wobble {
  20% { transform: translateX(-8px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(3px); }
}
.pad.glow { box-shadow: 0 0 0 6px var(--gold), 0 6px 0 rgba(0,0,0,.15); transition: box-shadow .3s; }
.pad svg { display: block; }

@media (orientation: landscape) {
  .stage { flex-direction: row; }
  .picture { width: clamp(120px, 26vh, 210px); }
}

.actions { display: flex; justify-content: center; gap: 16px; min-height: 64px; }

.stars {
  position: fixed; left: 50%; top: 42%;
  transform: translate(-50%, -50%);
  font-size: 84px;
  pointer-events: none;
  display: flex; gap: 8px;
  z-index: 10;
}
.stars span { width: 92px; height: 92px; animation: pop .5s cubic-bezier(.2,1.6,.4,1) backwards; filter: drop-shadow(0 4px 0 rgba(0,0,0,.2)); }
.stars span svg { width: 100%; height: 100%; display: block; }
.stars .fish-won { animation-delay: .5s; margin-left: 10px; }
.stars span:nth-child(2) { animation-delay: .15s; }
.stars span:nth-child(3) { animation-delay: .3s; }
.stars .dim { filter: grayscale(1) opacity(.35); }
@keyframes pop { from { transform: scale(0) rotate(-40deg); } }

/* ---------- Done ---------- */
#done { align-items: center; justify-content: center; text-align: center; color: #fff; }
.done-stars { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px; max-width: 520px; }
.done-stars svg { width: 52px; height: 52px; }
.done-new { font-size: 26px; font-weight: 700; min-height: 1em; }
.creatures-new { display: flex; justify-content: center; gap: 8px; }
.done-new .creature { display: block; width: 120px; height: 120px; margin: 8px 0 0; animation: pop .7s cubic-bezier(.2,1.6,.4,1) .4s backwards; }
.done-new .creature svg { width: 100%; height: 100%; }
.new-stickers { display: inline-flex; align-items: center; gap: 10px; font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif; font-size: 40px; }
.new-stickers svg { width: 34px; height: 34px; }

/* ---------- Sticker book ---------- */
.stickers {
  flex: 1; overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
  gap: 10px;
  align-content: start;
  padding-bottom: 20px;
}
.sticker {
  aspect-ratio: 1;
  border-radius: 18px;
  background: var(--card);
  font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
  font-size: 44px;
  display: grid; place-items: center;
  box-shadow: 0 4px 0 rgba(0,0,0,.15);
}
.sticker.locked { background: rgba(255,255,255,.25); color: rgba(255,255,255,.6); box-shadow: none; font-size: 28px; }
.sticker.bounce { animation: pop .5s cubic-bezier(.2,1.6,.4,1); }
.sticker .s { display: flex; gap: 0; font-size: 11px; position: absolute; }

/* ---------- Parent corner ---------- */
.parent { background: #f7f4fb; }
.parent .bar { color: var(--ink); }
.parent-body { overflow-y: auto; max-width: 640px; width: 100%; margin: 0 auto; font-size: 17px; line-height: 1.45; -webkit-user-select: text; user-select: text; }
.parent-body h3 { margin: 18px 0 6px; font-size: 18px; }
.parent-body .row { display: flex; gap: 10px; align-items: center; padding: 8px 0; }
.parent-body input[type=checkbox] { width: 24px; height: 24px; accent-color: var(--pink); }
.parent-body a { color: var(--deep); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}