:root{
  --bg:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --border:#e2e8f0;
  --blue:#2563eb;
  --blue2:#1d4ed8;
  --green:#16a34a;
  --red:#dc2626;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: #f8fafc;
  color: var(--text);
}
.container{
  max-width: 820px;
  margin: 40px auto;
  padding: 0 16px;
}
.card{
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.06);
}
.hidden{ display:none; }

h1{ margin:0 0 6px; font-size: 28px; }
.sub{ margin:0 0 18px; color: var(--muted); }

.input{
  width:100%;
  padding: 12px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 16px;
  outline:none;
}
.input:focus{ border-color: var(--blue); }
.input:disabled{
  background:#f8fafc;
  color: var(--muted);
  cursor:not-allowed;
}

.btn{
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background:#fff;
  cursor:pointer;
  transition: transform .05s ease, border-color .15s ease;
  font-size: 14px;
}
.btn:hover{ border-color:#cbd5e1; }
.btn:active{ transform: translateY(1px); }
.btn:disabled{
  opacity:.55;
  cursor:not-allowed;
}

.btn.primary{
  background: var(--blue);
  border-color: var(--blue);
  color: white;
}
.btn.primary:hover{ background: var(--blue2); border-color: var(--blue2); }

.btn.danger{
  background:#fff;
  border-color:#fecaca;
  color: var(--red);
}
.topbar{
  display:flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 10px;
}
.progress-bar{
  height:10px;
  border-radius: 999px;
  background:#e5e7eb;
  overflow:hidden;
  margin-bottom: 16px;
}
#progress-fill{
  height:100%;
  width:0%;
  background: var(--blue);
  transition: width .25s ease;
}

.audioRow{
  display:flex;
  gap:10px;
  align-items:center;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.tiny{ color: var(--muted); font-size: 13px; display:flex; gap:8px; align-items:center; }

.chips{
  min-height: 0;
  border: none;
  border-radius: 0;
  padding: 0;
  display:flex;
  gap:8px;
  flex-wrap: wrap;
  margin: 0;
}
.chips:not(:empty){
  margin-bottom: 12px;
}
.chip{
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background:#fff;
  font-size: 14px;
}
.chip.correct{
  border-color: #bbf7d0;
  background: #f0fdf4;
  color: var(--green);
}
.chip.wrong{
  border-color: #fecaca;
  background: #fef2f2;
  color: var(--red);
}
.chip.revealed{
  border-color:#fde68a;
  background:#fffbeb;
  color:#92400e;
}

.inputRow{
  display:flex;
  gap:10px;
  align-items:center;
  margin-bottom: 10px;
}
.inputRow .input{ flex:1; }

.answerReveal{
  margin: 0 0 10px;
  padding: 12px 14px;
  border: 1px solid #fde68a;
  border-radius: 12px;
  background: #fffbeb;
  color: #92400e;
  font-size: 15px;
}

.feedback{
  min-height: 22px;
  margin: 6px 0 14px;
  color: var(--muted);
}
.feedback.good{ color: var(--green); }
.feedback.bad{ color: var(--red); }

.bottomRow{
  display:flex;
  gap:10px;
  flex-wrap: wrap;
}