/* Gradient glow aesthetic without using the word you asked to avoid */
:root{
  --bg: #06070a;
  --panel: #0b0f17;
  --text: #e6ecff;
  --muted: #9db2ff;
  --primary: #7aa2ff;
  --accent: #c084fc;
  --good: #7af0b6;
  --warn: #ffd166;
  --bad: #ff7a9b;
  --ring: 0 0 20px rgba(122,162,255,.45), 0 0 40px rgba(192,132,252,.25);
}

*{box-sizing:border-box}

html,body{
  height:100%;
  background: radial-gradient(1200px 800px at 20% -10%, rgba(122,162,255,.15), transparent 60%),
              radial-gradient(1000px 600px at 100% 0%, rgba(192,132,252,.12), transparent 70%),
              radial-gradient(800px 800px at -10% 100%, rgba(122,255,209,.10), transparent 70%),
              var(--bg);
  color:var(--text);
  margin:0;
  font-family: ui-sans-serif, system-ui, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji;
  line-height:1.6;
}

#app{max-width:1200px;margin:0 auto;padding:20px}

.topBar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:16px 20px;
  background:linear-gradient(135deg, rgba(122,162,255,.09), rgba(192,132,252,.09));
  border:1px solid rgba(122,162,255,.25);
  border-radius:16px;
  box-shadow: var(--ring);
  backdrop-filter:saturate(140%) blur(6px);
}

h1,h2,h3{margin:0 0 12px 0}

.grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap:16px;
  margin-top:16px;
}
.inputPanel{grid-column:1 / 3}
.previewPanel{grid-column:2}
.explainPanel{grid-column:1}

.panel{
  background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00));
  border:1px solid rgba(122,162,255,.20);
  border-radius:16px;
  padding:16px;
  box-shadow: var(--ring);
  min-height: 200px;
}

textarea{
  width:100%;
  min-height:180px;
  border-radius:12px;
  border:1px solid rgba(122,162,255,.25);
  background: #0b0f17;
  color:var(--text);
  padding:12px;
  resize: vertical;
  outline:none;
  box-shadow: inset 0 0 10px rgba(122,162,255,.15);
}

.row{
  display:flex;
  align-items:center;
  gap:12px;
  margin-top:12px;
  flex-wrap:wrap;
}

.select, select, label{font-size:.95rem}

.btn{
  padding:10px 14px;
  border-radius:12px;
  border:1px solid rgba(122,162,255,.35);
  background: linear-gradient(135deg, rgba(122,162,255,.18), rgba(192,132,252,.18));
  color:var(--text);
  cursor:pointer;
  box-shadow: var(--ring);
}
.btn:hover{filter:brightness(1.08)}
.btn:active{transform:translateY(1px)}
.btn.primary{background: linear-gradient(135deg, rgba(122,162,255,.35), rgba(192,132,252,.35))}
.btn.secondary{background: linear-gradient(135deg, rgba(122,162,255,.10), rgba(192,132,252,.10))}
.btn.glow{outline:2px solid rgba(122,162,255,.35)}

.small{color:var(--muted);font-size:.9rem}

.explainHeader{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:8px;
}

.progressWrap{display:flex;align-items:center;gap:12px}
.progressBar{width:160px;height:10px;background:#0b0f17;border-radius:8px;overflow:hidden;border:1px solid rgba(122,162,255,.25)}
#progressFill{height:100%;width:0;background:linear-gradient(90deg, rgba(122,162,255,.8), rgba(192,132,252,.8))}

#explainArea{min-height:180px}
.explainBlock{
  background:#0b0f17;
  border:1px solid rgba(122,162,255,.25);
  border-radius:12px;
  padding:12px;
  min-height:120px;
}
.controls{display:flex;gap:10px;margin-top:12px}

.sources ul, .sources li{margin:0;padding:0;list-style:none}
.sources li{margin-top:6px}
.sources a{color:var(--primary)}

.previewPanel iframe{
  width:100%;
  height:360px;
  background:white;
  border:0;
  border-radius:12px;
  box-shadow: inset 0 0 8px rgba(0,0,0,.25);
}

.quiz.hidden{display:none}
.quiz .options{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.quiz .options button{padding:8px 10px}
#quizFeedback{margin-top:8px}

.footer{
  margin-top:16px;
  text-align:center;
  color:var(--muted);
}

@media (max-width: 980px){
  .grid{grid-template-columns:1fr}
  .inputPanel{grid-column:1}
  .explainPanel{grid-column:1}
  .previewPanel{grid-column:1}
}