:root{
  --sky:#8CD6F5;
  --yellow:#FFCA45;
  --coral:#F56357;
  --purple:#805EC2;
  --ink:#1F3361;
  --bg:#F6FBFF;
  --white:#fff;
  --muted:#6A7896;
  --line:#DDE8F3;
  --success:#2D8C6B;
  --radius:24px;
  font-family: "Arial", "Tahoma", sans-serif;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  min-height:100vh;
}
button,input{font:inherit}
button{cursor:pointer}
#app{
  width:min(100%,430px);
  margin:0 auto;
  min-height:100vh;
  background:var(--bg);
}
.screen{
  min-height:100vh;
  padding:20px 18px 32px;
}
.hero{
  background:var(--sky);
  margin:-20px -18px 22px;
  padding:26px 22px 30px;
  border-radius:0 0 30px 30px;
  text-align:center;
}
.brand{
  font-size:34px;
  font-weight:800;
  margin:20px 0 8px;
}
.subtitle{font-size:17px;line-height:1.7;margin:0}
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px;
}
.stack{display:grid;gap:14px}
.row{display:flex;gap:10px;align-items:center}
.space{justify-content:space-between}
.btn{
  border:0;
  border-radius:18px;
  min-height:52px;
  padding:0 20px;
  font-weight:800;
  font-size:17px;
}
.btn-primary{background:var(--ink);color:#fff;width:100%}
.btn-coral{background:var(--coral);color:#fff;width:100%}
.btn-soft{background:#fff;color:var(--ink);border:1px solid var(--line)}
.small{font-size:14px;color:var(--muted)}
.title{font-size:26px;margin:0 0 8px}
.section-title{font-size:20px;margin:0 0 12px}
.lesson-card{display:grid;grid-template-columns:56px 1fr;gap:14px;align-items:center}
.num{
  width:52px;height:52px;border-radius:16px;
  display:grid;place-items:center;font-weight:800;font-size:22px;
  background:#FFF2BC;
}
.progress-track{height:10px;background:#EAF1F7;border-radius:999px;overflow:hidden}
.progress-fill{height:100%;background:var(--coral);border-radius:999px}
.words-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.word-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px;text-align:center}
.word-card.mastered{border-color:#A7DCC9;background:#F5FFFB}
.word{font-size:23px;font-weight:800}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 10px;border-radius:999px;background:#EEF5FA;font-size:13px;color:var(--muted)
}
.audio{
  width:72px;height:72px;border-radius:50%;border:0;
  background:var(--yellow);font-size:32px;display:grid;place-items:center;margin:0 auto
}
.meaning{
  background:#FFF7D8;border:1px solid #FFE58A;border-radius:18px;
  padding:14px;text-align:center;font-size:18px
}
.answer-field{
  min-height:72px;border:2px dashed #B8C7D8;border-radius:20px;
  display:flex;align-items:center;justify-content:center;
  background:#fff;font-size:31px;font-weight:800;padding:10px
}
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.tile{
  min-height:58px;border:1px solid var(--line);background:#fff;border-radius:17px;
  font-size:26px;font-weight:800;color:var(--ink)
}
.tile:disabled{opacity:.35}
.keyboard{display:grid;grid-template-columns:repeat(7,1fr);gap:7px}
.key{
  min-height:44px;border:1px solid var(--line);background:#fff;border-radius:12px;
  font-size:19px;color:var(--ink)
}
.key.wide{grid-column:span 2}
.notice{min-height:24px;text-align:center;font-size:14px;color:var(--coral);font-weight:700}
.check{
  width:88px;height:88px;border-radius:50%;background:#E8F8F2;
  display:grid;place-items:center;font-size:42px;margin:12px auto
}
.result-word{font-size:38px;font-weight:900;text-align:center;margin:6px 0 18px}
.next-card{background:#F3EEFF;border:1px solid #DCCFFA}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.back{border:0;background:transparent;font-size:30px;color:var(--ink);padding:4px 8px}
.rounds{display:flex;gap:7px;justify-content:center}
.dot{width:10px;height:10px;border-radius:50%;background:#D6E2EC}
.dot.active{background:var(--purple)}
.center{text-align:center}
.pen{
  font-size:48px;text-align:center;margin:12px 0
}
@media (max-width:360px){
  .keyboard{grid-template-columns:repeat(6,1fr)}
  .brand{font-size:30px}
  .words-grid{grid-template-columns:1fr}
}

.notice{
  border-radius:14px;
  padding:10px 12px;
  transition:.2s ease;
}
.notice:empty{padding:0}
.notice.error{
  color:#A7352E;
  background:#FFF0EE;
  border:1px solid #F7B7B1;
}
.notice.ok{
  color:#17684E;
  background:#EAF8F2;
  border:1px solid #A8DCCB;
}

.word-card.learning{
  border:2px solid #FFCA45;
  background:#FFF9E8;
}
.word-card.strong{
  border:2px solid #8CD6F5;
  background:#EDF9FE;
}
.tile:disabled{
  opacity:.35;
  transform:none;
}