/* LetterLand prototype styles. Theme colors come from CSS variables set per
   theme in themes.js. Layout targets tablet/large screens but is responsive. */

* { box-sizing: border-box; margin: 0; padding: 0; }
:root { --primary:#4a7cf0; --ink:#2b3547; }

html, body { height: 100%; }
body {
  /* The rounded display faces carry Latin only, so CJK and Korean interface
     text falls through to the platform families listed after them. */
  font-family: "Baloo 2", "Comic Sans MS", "Segoe UI Rounded", "Segoe UI",
    "Microsoft YaHei", "PingFang SC", "Microsoft JhengHei", "PingFang TC",
    "Malgun Gothic", "Apple SD Gothic Neo", "Noto Sans CJK", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg, #eef2f7);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  transition: background .5s ease;
}

#decor { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.decor-item { position: absolute; will-change: transform; animation: float linear infinite; }
.decor-item.static { animation: none; }
@keyframes float {
  0%   { transform: translateY(0) rotate(0); }
  50%  { transform: translateY(-22px) rotate(12deg); }
  100% { transform: translateY(0) rotate(0); }
}
body.reduced .decor-item { animation: none !important; }

#app {
  position: relative; z-index: 1;
  min-height: 100%;
  display: flex; flex-direction: column; align-items: center;
  padding: 18px; gap: 14px;
}

/* ---------- shared components ---------- */
.panel {
  width: min(760px, 96vw);
  background: var(--panel, #fff);
  border-radius: 26px;
  padding: 26px;
  box-shadow: 0 18px 50px rgba(0,0,0,.16);
  backdrop-filter: blur(4px);
}
.btn-primary, .btn-ghost, .btn-danger {
  border: none; cursor: pointer; font: inherit; font-weight: 800;
  border-radius: 18px; padding: 14px 26px; font-size: 1.1rem;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn-primary { background: var(--primary); color: var(--primary-ink, #fff); box-shadow: 0 8px 0 rgba(0,0,0,.15); }
.btn-ghost { background: rgba(0,0,0,.06); color: var(--ink); }
.btn-danger { background: var(--bad, #ff6f6f); color: #fff; }
.btn-primary:active, .btn-ghost:active, .btn-danger:active { transform: translateY(3px); box-shadow: none; }
.big { font-size: 1.35rem; padding: 18px 40px; border-radius: 22px; }
.row-center { display: flex; gap: 14px; justify-content: center; margin-top: 18px; flex-wrap: wrap; }
.row-center.wrap { margin-top: 24px; }
.icon-btn { background: rgba(0,0,0,.06); border: none; border-radius: 50%; cursor: pointer; font-size: 1.4rem; }
.icon-btn.small { width: 52px; height: 52px; }

/* ---------- setup ---------- */
.brand { display: flex; align-items: baseline; gap: 8px; font-size: 1.9rem; margin-bottom: 6px; }
.brand-sub { font-size: 1rem; color: var(--muted); margin-left: 6px; font-weight: 600; }
.lead { color: var(--muted); margin-bottom: 16px; line-height: 1.4; }
.field { margin-bottom: 18px; }
.field-label { font-weight: 800; margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  border: 2px solid var(--key-border, #ccc); background: var(--key, #fff);
  color: var(--key-ink, var(--ink)); border-radius: 16px; padding: 10px 16px;
  font: inherit; font-weight: 700; cursor: pointer; font-size: 1rem; transition: all .12s;
}
.chip.on { background: var(--primary); color: var(--primary-ink,#fff); border-color: var(--primary); transform: scale(1.03); }

/* ---------- world select ---------- */
.world-screen { width: min(900px,96vw); display: flex; flex-direction: column; align-items: center; gap: 18px; }
.big-q { font-size: clamp(1.5rem, 4vw, 2.4rem); text-align: center; color: var(--ink);
  background: var(--panel); padding: 14px 26px; border-radius: 22px; }
.world-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px,1fr)); gap: 16px; width: 100%; }
.world-card {
  border: 4px solid transparent; border-radius: 26px; cursor: pointer; padding: 22px 14px;
  color: #fff; text-align: center; box-shadow: 0 12px 30px rgba(0,0,0,.2);
  transition: transform .15s ease, border-color .15s; min-height: 180px;
}
.world-card:hover { transform: translateY(-4px); }
.world-card.on { border-color: #fff; transform: translateY(-6px) scale(1.03); box-shadow: 0 0 0 4px var(--primary), 0 16px 36px rgba(0,0,0,.28); }
.world-emoji { font-size: 3.4rem; filter: drop-shadow(0 3px 6px rgba(0,0,0,.3)); }
.world-name { font-size: 1.4rem; font-weight: 900; margin-top: 8px; text-shadow: 0 2px 6px rgba(0,0,0,.4); }
.world-tag { font-size: .95rem; opacity: .95; margin-top: 4px; text-shadow: 0 1px 4px rgba(0,0,0,.4); }

.preview { width: 100%; }
.preview-head { font-weight: 800; font-size: 1.2rem; margin-bottom: 10px; }
.preview-body { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.preview-avatars { display: flex; gap: 8px; font-size: 2rem; }
.preview-anim { display: flex; gap: 30px; font-size: 3rem; align-items: center; }
.prev-obj.bob { animation: bob 1.4s ease-in-out infinite; }
@keyframes bob { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-14px)} }
body.reduced .prev-obj.bob { animation: none; }
.preview-note { color: var(--muted); text-align: center; font-weight: 600; }
.preview-btns { display: flex; gap: 12px; justify-content: center; margin-top: 12px; }

/* ---------- avatar ---------- */
.avatar-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.avatar-cell {
  font-size: 3.4rem; background: var(--panel); border: 4px solid var(--key-border,#ccc);
  border-radius: 24px; padding: 18px; cursor: pointer; transition: transform .12s;
}
.avatar-cell.on { border-color: var(--primary); transform: scale(1.06); box-shadow: 0 0 0 4px var(--ring); }

/* ---------- home ---------- */
.home { width: min(760px,96vw); display: flex; flex-direction: column; align-items: center; gap: 22px; }
.home-top { width: 100%; display: flex; justify-content: space-between; align-items: center; }
.star-count { background: var(--panel); border-radius: 20px; padding: 10px 18px; font-weight: 900; font-size: 1.2rem; }
.home-hero { text-align: center; }
.avatar-big { font-size: 6rem; animation: bob 2.4s ease-in-out infinite; }
body.reduced .avatar-big { animation: none; }
.companion { font-size: 2.6rem; margin-top: -10px; }
.home-title { font-size: 2.6rem; color: #fff; text-shadow: 0 3px 10px rgba(0,0,0,.35); }
.home-sub { color: #fff; font-weight: 700; opacity: .95; text-shadow: 0 2px 6px rgba(0,0,0,.35); }
.home-buttons { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.play-btn, .world-btn {
  border: none; cursor: pointer; border-radius: 30px; padding: 26px 40px; font: inherit;
  font-weight: 900; font-size: 1.5rem; display: flex; flex-direction: column; align-items: center; gap: 6px;
  box-shadow: 0 10px 0 rgba(0,0,0,.18); transition: transform .1s;
}
.play-btn { background: var(--primary); color: var(--primary-ink,#fff); }
.world-btn { background: var(--panel); color: var(--ink); }
.play-btn:active, .world-btn:active { transform: translateY(4px); box-shadow: none; }
.play-icon { font-size: 2.6rem; }
.home-progress { width: 100%; text-align: center; }
.bar { width: 100%; height: 18px; background: rgba(0,0,0,.12); border-radius: 12px; overflow: hidden; }
.bar.big { height: 26px; margin: 10px 0; }
.bar-fill { height: 100%; background: var(--good,#2fb872); border-radius: 12px; transition: width .5s; }
.home-progress-label { margin-top: 8px; font-weight: 700; color: #fff; text-shadow: 0 1px 4px rgba(0,0,0,.35); }

/* ---------- activity ---------- */
.activity { width: min(820px,98vw); display: flex; flex-direction: column; align-items: center; gap: 16px; }
.act-top { width: 100%; display: flex; justify-content: space-between; align-items: center; }
.timer { background: var(--panel); border-radius: 20px; padding: 10px 18px; font-weight: 900; font-size: 1.15rem; }
.learn-zone {
  width: 100%; background: var(--panel); border-radius: 28px; padding: 24px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  box-shadow: 0 12px 34px rgba(0,0,0,.14);
}
.mode-tag { font-weight: 800; color: var(--muted); letter-spacing: .5px; text-transform: uppercase; font-size: .9rem; }
.obj-emoji { font-size: 7.5rem; animation: bob 2.2s ease-in-out infinite; }
body.reduced .obj-emoji { animation: none; }
.big-letter-target {
  font-size: 6.5rem; font-weight: 900; color: var(--primary);
  min-width: 140px; text-align: center; line-height: 1;
}
.prompt { font-size: 1.6rem; font-weight: 800; text-align: center; }

/* Word hint: small muted instruction + a large, distinctly-colored target word
   whose next-needed letter flashes to guide the child (customer feedback). */
.hint-prompt { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.prompt-label { font-size: 1.15rem; font-weight: 700; color: var(--muted); }
.target-word { display: flex; gap: 6px; justify-content: center; }
.tw-letter {
  font-size: 3.4rem; font-weight: 900; color: var(--primary); line-height: 1;
  padding: 2px 8px; border-radius: 12px; transition: color .2s;
}
.tw-letter.done { color: var(--good, #2fb872); }
.tw-letter.dim { opacity: .35; }
.tw-letter.next {
  color: var(--accent, #f0a04a);
  animation: hintflash 1.05s ease-in-out infinite;
}
@keyframes hintflash {
  0%, 100% { transform: scale(1); text-shadow: none; }
  50% { transform: scale(1.32); text-shadow: 0 0 16px var(--accent, #f0a04a); }
}
body.reduced .tw-letter.next { animation: none; text-decoration: underline; text-underline-offset: 6px; }

.slots { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.slot {
  width: 82px; height: 98px; border-radius: 18px; border: 4px dashed var(--key-border,#bbb);
  background: rgba(255,255,255,.5); display: flex; align-items: center; justify-content: center;
  font-size: 3.3rem; font-weight: 900; color: var(--ink);
}
.slot.filled { border-style: solid; border-color: var(--good,#2fb872); background: rgba(47,184,114,.14); animation: pop .3s; }
.slot.blank { border-color: var(--primary); background: var(--ring); }
.slot.active { border-style: solid; border-color: var(--primary); box-shadow: 0 0 0 4px var(--ring); animation: nextpulse 1.2s ease-in-out infinite; }
.slot.flash { animation: slotflash .5s ease-out; }
@keyframes pop { 0%{transform:scale(.6)} 60%{transform:scale(1.15)} 100%{transform:scale(1)} }
@keyframes slotflash {
  0%   { transform: scale(.7); box-shadow: 0 0 0 0 rgba(255,255,255,.9); background: #fff; }
  40%  { transform: scale(1.25); box-shadow: 0 0 26px 10px var(--good,#2fb872); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(47,184,114,0); }
}
@keyframes nextpulse { 0%,100%{ box-shadow: 0 0 0 3px var(--ring);} 50%{ box-shadow: 0 0 0 8px var(--ring);} }
body.reduced .slot.filled, body.reduced .slot.flash, body.reduced .slot.active { animation: none; }

/* ---- Explorer (ages 6-9) ------------------------------------------------ */

/* Real photograph for a word, with the emoji as a graceful fallback. Fixed
   height so slots and keyboard never jump as pictures load. */
.obj-photo { display: flex; align-items: center; justify-content: center; height: 190px; width: 100%; }
.obj-photo .photo {
  max-height: 190px; max-width: min(100%, 320px); object-fit: contain;
  border-radius: 18px; border: 4px solid var(--key-border,#ccc); background: #fff;
  box-shadow: 0 6px 18px rgba(0,0,0,.16);
}
.obj-photo .obj-emoji { font-size: 6.4rem; }

.meaning { text-align: center; max-width: 640px; }
.meaning-def { font-size: 1.15rem; font-weight: 700; color: var(--ink); line-height: 1.4; }
.meaning-sentence { margin-top: 8px; font-size: 1.05rem; color: var(--muted); font-style: italic; }
.gap {
  display: inline-block; min-width: 74px; padding: 0 8px; margin: 0 3px;
  border-bottom: 4px solid var(--primary); font-weight: 900; font-style: normal;
  color: var(--primary); text-align: center;
}
.gap.filled { color: var(--good,#2fb872); border-bottom-color: var(--good,#2fb872); }

/* Free typing: a wrong letter is allowed to sit in its slot until checked. */
.slot.bad {
  border-style: solid; border-color: var(--bad,#ff6f6f);
  background: rgba(255,111,111,.18); color: var(--bad,#ff6f6f);
}
.slot.good { border-color: var(--good,#2fb872); }
/* Long words (up to 13 letters) shrink, and their row tightens, so the whole
   word stays on a single line rather than wrapping. */
.slots.many { gap: 7px; flex-wrap: nowrap; }
.slot.tight { width: 48px; height: 62px; font-size: 1.9rem; border-radius: 12px; border-width: 3px; flex: 0 0 auto; }

/* Two-class selectors so these beat the plain .key rules defined further down
   (max-width in particular), regardless of source order. */
.kb-row.kb-row-4 { padding: 0 12%; gap: 16px; margin-top: 2px; }
.key.key-wide {
  flex: 1 1 0; max-width: 220px; min-width: 120px; font-size: 1.1rem;
  letter-spacing: .01em; white-space: nowrap; padding: 0 10px;
}
.key.key-check { background: var(--good,#2fb872); color: #fff; border-color: var(--good,#2fb872); }

.celebrate-photo { height: 150px; margin: 4px 0; }
.celebrate-photo .photo { max-height: 150px; max-width: min(80vw, 260px); }
.celebrate-def { max-width: 560px; text-align: center; font-size: 1.05rem; color: var(--muted); padding: 0 16px; }

.field-note { font-size: .92rem; color: var(--muted); margin: -4px 0 8px; line-height: 1.35; }
.bank-badge {
  display: inline-block; margin: -4px 0 14px; padding: 6px 14px; border-radius: 999px;
  background: var(--ring); color: var(--ink); font-weight: 800; font-size: .95rem;
}

.act-tools { display: flex; gap: 14px; }
.tool-btn {
  background: var(--panel); border: 3px solid var(--key-border,#ccc); border-radius: 18px;
  padding: 12px 22px; font: inherit; font-weight: 800; font-size: 1.05rem; cursor: pointer;
}
.tool-btn:active { transform: translateY(2px); }

.keyboard { display: flex; flex-direction: column; gap: 10px; width: 100%; align-items: center; }
.kb-row { display: flex; gap: 8px; justify-content: center; width: 100%; }
/* QWERTY stagger: rows 2 and 3 are inset so every key stays the same width
   as the 10-key top row (half a key, then a key and a half). */
.kb-row-2 { padding: 0 5%; }
.kb-row-3 { padding: 0 15%; }
.key {
  flex: 1 1 0; max-width: 76px; min-width: 28px; height: 64px;
  border: 3px solid var(--key-border,#ccc); background: var(--key,#fff); color: var(--key-ink,var(--ink));
  border-radius: 16px; font: inherit; font-weight: 900; font-size: 1.6rem; cursor: pointer;
  box-shadow: 0 5px 0 rgba(0,0,0,.12); transition: transform .06s, box-shadow .06s;
}
.key:active, .key.press { transform: translateY(4px); box-shadow: none; }
.key.wrong { background: var(--bad,#ff6f6f); color: #fff; border-color: var(--bad,#ff6f6f); }
.key.correct-flash { animation: keyflash .48s ease-out; z-index: 2; }
@keyframes keyflash {
  0%   { background:#fff; color:#fff; border-color: var(--good,#2fb872); box-shadow: 0 0 0 0 rgba(255,255,255,.95); transform: translateY(0) scale(1.12); }
  35%  { background: var(--good,#2fb872); color:#fff; box-shadow: 0 0 22px 8px var(--good,#2fb872); }
  100% { background: var(--key,#fff); color: var(--key-ink,var(--ink)); box-shadow: 0 5px 0 rgba(0,0,0,.12); transform: translateY(0) scale(1); }
}
body.reduced .key.correct-flash { animation: none; }
.key.hint { animation: hintpulse 1s ease-in-out 2; border-color: var(--good,#2fb872); box-shadow: 0 0 0 4px var(--ring); }
@keyframes hintpulse { 0%,100%{ box-shadow: 0 0 0 3px var(--ring);} 50%{ box-shadow: 0 0 0 10px var(--ring);} }
.shake { animation: shake .4s; }
@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-8px)} 40%{transform:translateX(8px)} 60%{transform:translateX(-6px)} 80%{transform:translateX(6px)} }
body.reduced .shake, body.reduced .key.hint { animation: none; }

/* ---------- celebrate ---------- */
.celebrate {
  position: fixed; inset: 0; z-index: 40; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 10px;
  background: radial-gradient(circle at center, rgba(255,255,255,.7), rgba(255,255,255,.2));
  backdrop-filter: blur(2px);
}
.celebrate-word { font-size: 3rem; font-weight: 900; color: var(--primary); animation: pop .4s; }
.celebrate-obj { font-size: 5rem; animation: bob 1s ease-in-out infinite; }
.celebrate-stars { font-size: 2rem; font-weight: 900; color: var(--good,#2fb872); }
.celebrate-note { font-weight: 700; color: var(--ink); max-width: 80vw; text-align: center; }
.celebrate-next { margin-top: 6px; font-weight: 800; color: var(--muted); font-size: .95rem; letter-spacing: .5px; }
.burst { position: absolute; font-size: 2rem; animation: burst 1.4s ease-out forwards; }
@keyframes burst {
  0% { transform: translate(-50%,-50%) scale(.4); opacity: 1; }
  100% { transform: translate(calc(-50% + var(--dx)*45vw), calc(-50% + var(--dy)*55vh)) scale(1.3); opacity: 0; }
}
body.reduced .celebrate-obj { animation: none; }

/* ---------- complete ---------- */
.complete { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 16px;
  background: var(--panel); border-radius: 30px; padding: 40px; width: min(560px,94vw); box-shadow: 0 18px 50px rgba(0,0,0,.18); }
.complete-emoji { font-size: 5rem; }
.big-stars { font-size: 2.6rem; }
.complete-stats { font-size: 1.2rem; font-weight: 700; color: var(--muted); }

/* ---------- parent ---------- */
.gate { max-width: 460px; text-align: center; }
.gate-q { font-size: 2.4rem; font-weight: 900; margin: 14px 0; }
.gate-input { font-size: 1.6rem; padding: 12px; width: 140px; text-align: center; border-radius: 14px; border: 3px solid var(--key-border,#ccc); }
.parent { max-width: 820px; }
.parent-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.parent h3 { margin: 22px 0 10px; border-top: 2px solid rgba(0,0,0,.08); padding-top: 16px; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit,minmax(120px,1fr)); gap: 12px; }
.stat-card { background: rgba(0,0,0,.05); border-radius: 18px; padding: 16px; text-align: center; }
.stat-big { font-size: 1.7rem; font-weight: 900; color: var(--primary); }
.stat-label { font-size: .85rem; color: var(--muted); font-weight: 700; margin-top: 4px; }
.muted-line, .note-small { color: var(--muted); font-size: .9rem; }
.note-small { margin-top: 8px; font-style: italic; }
.usage { display: flex; flex-direction: column; gap: 8px; }
.usage-row { display: flex; align-items: center; gap: 12px; }
.usage-name { width: 210px; font-weight: 700; }
.usage-bar { flex: 1; height: 16px; background: rgba(0,0,0,.1); border-radius: 10px; overflow: hidden; }
.usage-fill { display: block; height: 100%; background: var(--accent,#f0a04a); }
.usage-n { width: 26px; text-align: right; font-weight: 800; }
.prow { margin: 12px 0; }
.prow-label { font-weight: 800; margin-bottom: 8px; }

@media (max-width: 560px) {
  .key { height: 52px; font-size: 1.3rem; min-width: 22px; border-width: 2px; border-radius: 12px; }
  .kb-row { gap: 5px; }
  .obj-emoji { font-size: 5.4rem; }
  .slot { width: 60px; height: 74px; font-size: 2.6rem; }
  .tw-letter { font-size: 2.6rem; padding: 2px 5px; }
  .usage-name { width: 130px; font-size: .85rem; }

  /* Explorer words are long, so phone slots shrink further and the photo
     gives up height to keep the keyboard above the fold. */
  .slots { gap: 6px; }
  .slots.many { gap: 3px; }
  .slot.tight { width: 25px; height: 36px; font-size: 1.05rem; border-width: 2px; border-radius: 6px; }
  .obj-photo { height: 132px; }
  .obj-photo .photo { max-height: 132px; border-width: 3px; }
  .obj-photo .obj-emoji { font-size: 4.6rem; }
  .meaning-def { font-size: 1rem; }
  .meaning-sentence { font-size: .95rem; }
  .celebrate-photo { height: 108px; }
  .celebrate-photo .photo { max-height: 108px; }
  .key.key-wide { font-size: .95rem; max-width: 160px; min-width: 96px; }
  .kb-row.kb-row-4 { padding: 0 4%; gap: 10px; }
}