*{box-sizing:border-box}
:root{
  --bg:#fbfaf7;
  --paper:#fff;
  --ink:#111;
  --muted:#6b675f;
  --line:#e4dfd5;
  --soft:#f2eee6;
  --sage:#8fa38a;
  --sage-dark:#526b50;
  --sand:#d8cbb8;
  --blue:#24384a;
}
body{
  margin:0;
  background:radial-gradient(circle at top left,#f3efe6,transparent 32%),var(--bg);
  color:var(--ink);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
.app{min-height:100vh;display:grid;grid-template-columns:330px 1fr}
.sidebar{
  border-right:1px solid var(--line);
  padding:26px;
  display:flex;
  flex-direction:column;
  gap:22px;
  background:rgba(255,255,255,.78);
  backdrop-filter:blur(18px);
  position:sticky;
  top:0;
  height:100vh;
  overflow:auto;
}
.brand{display:flex;gap:14px;align-items:center}
.brand-mark{
  width:56px;height:56px;border-radius:22px;background:var(--ink);color:white;
  display:grid;place-items:center;font-family:Georgia,serif;font-size:30px;font-weight:700
}
.brand h1{margin:0;font-size:24px;letter-spacing:-.05em}
.brand p{margin:5px 0 0;color:var(--muted)}
.progress-box,.teacher-box{
  border:1px solid var(--line);border-radius:24px;padding:16px;background:var(--paper)
}
.mini-label,.label{
  margin:0 0 8px;text-transform:uppercase;letter-spacing:.16em;font-size:12px;color:var(--muted)
}
.progress-bar{height:10px;background:var(--soft);border-radius:999px;overflow:hidden}
#progressFill{height:100%;width:0;background:var(--sage-dark);transition:.3s}
#progressText,.teacher-box p:last-child{margin:9px 0 0;color:var(--muted);font-size:14px;line-height:1.4}
nav{display:grid;gap:8px}
.nav-btn{
  border:1px solid var(--line);background:var(--paper);border-radius:18px;padding:13px 14px;
  text-align:left;cursor:pointer;font-size:15px;color:var(--ink)
}
.nav-btn.active{background:var(--ink);color:white;border-color:var(--ink)}
.main{padding:42px;max-width:1100px}
.hero{margin-bottom:24px}
.eyebrow{margin:0 0 10px;color:var(--sage-dark);text-transform:uppercase;letter-spacing:.14em;font-size:13px;font-weight:800}
.hero h2{font-size:clamp(42px,7vw,88px);line-height:.94;letter-spacing:-.08em;margin:0}
.hero p{color:var(--muted);font-size:20px;line-height:1.45;max-width:740px}
.sound-card,.lesson-panel,.quiz-panel,.alphabet-map{
  background:rgba(255,255,255,.86);border:1px solid var(--line);border-radius:34px;padding:30px;
  box-shadow:0 24px 80px rgba(35,35,35,.06)
}
.top-row,.quiz-head{display:flex;justify-content:flex-end;gap:10px;margin-bottom:18px}
.visual-zone{display:grid;grid-template-columns:170px 1fr;align-items:center;gap:28px}
.emoji{
  width:170px;height:170px;border-radius:38px;background:linear-gradient(145deg,#fff,#f2eee6);
  display:grid;place-items:center;font-size:96px;border:1px solid var(--line)
}
.sound{font-size:clamp(100px,19vw,190px);line-height:.82;font-weight:900;letter-spacing:-.09em}
.word-zone{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:28px 0;margin:28px 0;text-align:center}
.word-zone h3{font-size:clamp(48px,10vw,96px);line-height:.92;margin:0;letter-spacing:-.07em}
.word-zone p{margin:12px 0 0;color:var(--muted);font-size:22px}
.phonetic-zone{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.phonetic-zone>div,.teacher-guide{
  border:1px solid var(--line);background:var(--soft);border-radius:24px;padding:18px
}
.phonetic-zone p:last-child,.teacher-guide p:last-child{margin:0;line-height:1.45}
.teacher-guide{margin-top:18px;display:none}
.teacher-guide.show{display:block}
.practice-area{margin-top:24px}
#practiceList,#quickMap{display:flex;flex-wrap:wrap;gap:10px}
.practice-chip,.map-chip{
  border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 15px;font-weight:800;cursor:pointer
}
.practice-chip:hover,.map-chip:hover{border-color:var(--ink);transform:translateY(-1px)}
.map-chip.active{background:var(--ink);color:white}
.controls,.bottom-controls,.quiz-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;align-items:center}
button{
  border:1px solid var(--ink);background:var(--ink);color:white;border-radius:999px;
  padding:14px 18px;font-size:15px;cursor:pointer;font-weight:800
}
button.ghost{background:#fff;color:var(--ink)}
button.small{font-size:13px;padding:10px 13px}
#counter{color:var(--muted);font-weight:800}
.lesson-panel,.quiz-panel,.alphabet-map{margin-top:24px}
.lesson-panel h3,.quiz-panel h3,.alphabet-map h3{margin:0 0 14px;font-size:28px;letter-spacing:-.04em}
#lessonText{font-size:17px;line-height:1.6;color:#333}
.quiz-options{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.quiz-options button{background:#fff;color:var(--ink);min-height:58px}
.quiz-options button.correct{background:var(--sage-dark);color:white}
.quiz-options button.wrong{opacity:.45}
.quiz-feedback{min-height:24px;font-weight:800}
body.focus .sidebar,body.focus .lesson-panel,body.focus .quiz-panel,body.focus .alphabet-map,body.focus .phonetic-zone,body.focus .teacher-guide,body.focus .practice-area,body.focus .top-row{display:none}
body.focus .app{grid-template-columns:1fr}
body.focus .main{max-width:780px;margin:auto}
body.focus .visual-zone{grid-template-columns:1fr;text-align:center}
body.focus .emoji{margin:auto}
@media(max-width:880px){
  .app{grid-template-columns:1fr}
  .sidebar{position:relative;height:auto;border-right:none;border-bottom:1px solid var(--line)}
  .main{padding:24px 14px}
  .visual-zone{grid-template-columns:1fr;text-align:center}
  .emoji{margin:auto}
  .phonetic-zone,.quiz-options{grid-template-columns:1fr}
  .controls button,.bottom-controls button,.quiz-actions button{width:100%}
  .bottom-controls{justify-content:center}
}