:root{
  --bg: #0b0c10;
  --panel: #151822;
  --panel2: #10121a;
  --text: #e8edf7;
  --muted: #a8b2c8;
  --accent: #7aa2ff;
  --good: #3ddc97;
  --bad: #ff6b6b;
  --warn: #ffd166;
  --border: rgba(255,255,255,.12);
  --shadow: 0 8px 20px rgba(0,0,0,.35);
  --radius: 14px;
}

*{ box-sizing: border-box; }

html, body{
  margin: 0;
  padding: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1200px 700px at 30% -10%, rgba(122,162,255,.25), transparent 60%),
              radial-gradient(900px 600px at 80% 10%, rgba(61,220,151,.18), transparent 55%),
              var(--bg);
  color: var(--text);
}

a{ color: inherit; text-decoration: none; }
a:hover{ text-decoration: underline; }

.topbar{
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 12, 16, .85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.topbar__inner{
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand{
  font-weight: 800;
  letter-spacing: .2px;
}

.nav{
  display: flex;
  gap: 10px;
  align-items: center;
}

.nav__link{
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  color: var(--muted);
}

.nav__link:hover{
  background: rgba(255,255,255,.06);
  border-color: var(--border);
  color: var(--text);
  text-decoration: none;
}

.nav__button{
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  color: var(--text);
  cursor: pointer;
}

.nav__button:hover{ filter: brightness(1.08); }

.app{
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 16px 44px;
}

.footer{
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.1);
}

.footer__inner{
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 16px;
}

h1,h2,h3{
  margin: 0 0 10px;
}

.muted{ color: var(--muted); }

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
}

.card + .card{ margin-top: 12px; }

.grid{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
}

.col-12{ grid-column: span 12; }
.col-8{ grid-column: span 8; }
.col-6{ grid-column: span 6; }
.col-4{ grid-column: span 4; }
.col-3{ grid-column: span 3; }

@media (max-width: 840px){
  .col-8, .col-6, .col-4, .col-3{ grid-column: span 12; }
  .nav{ flex-wrap: wrap; justify-content: flex-end; }
}

.btnrow{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

button.primary, a.primary,
button.secondary, a.secondary,
button.ghost, a.ghost{
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 650;
}

button.primary, a.primary{
  background: rgba(122,162,255,.18);
}
button.primary:hover, a.primary:hover{ filter: brightness(1.12); text-decoration:none; }

button.secondary, a.secondary{
  background: rgba(255,255,255,.06);
}
button.secondary:hover, a.secondary:hover{ filter: brightness(1.08); text-decoration:none; }

button.ghost, a.ghost{
  background: transparent;
}
button.ghost:hover, a.ghost:hover{ background: rgba(255,255,255,.06); text-decoration:none; }

button[disabled], a[aria-disabled="true"]{
  opacity: .55;
  cursor: not-allowed;
}

.pillrow{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 0;
}

.pill{
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--muted);
  font-size: 13px;
}
.pill.current{
  color: var(--text);
  border-color: rgba(122,162,255,.55);
  background: rgba(122,162,255,.14);
}

.bigletter{
  font-size: 92px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: .5px;
  margin: 6px 0 8px;
}
@media (max-width: 520px){
  .bigletter{ font-size: 72px; }
}

.kbd{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255,255,255,.05);
  color: var(--text);
}

.status{
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-top: 10px;
}

.status.good{
  border-color: rgba(61,220,151,.55);
  background: rgba(61,220,151,.12);
}

.status.bad{
  border-color: rgba(255,107,107,.55);
  background: rgba(255,107,107,.12);
}

.status.warn{
  border-color: rgba(255,209,102,.55);
  background: rgba(255,209,102,.10);
}

.field{
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 10px;
}

input[type="text"]{
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0,0,0,.25);
  color: var(--text);
  outline: none;
}

label{
  color: var(--muted);
  font-size: 13px;
}

small{ color: var(--muted); }

.table{
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.03);
  margin-top: 10px;
}
.table th, .table td{
  padding: 10px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  text-align: left;
}
.table th{ color: var(--muted); font-weight: 700; }
.table tr:last-child td{ border-bottom: 0; }

.rowtitle{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.audio-inline{
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

meter{
  width: 100%;
  height: 14px;
}



/* Multiple-choice blocks */
.choices{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

button.choicebtn{
  font-size: 24px;
  padding: 14px 12px;
  justify-content: center;
}

button.choicebtn--correct{
  outline: 2px solid rgba(90, 255, 170, .9);
  background: rgba(90, 255, 170, .10);
}

button.choicebtn--wrong{
  outline: 2px solid rgba(255, 90, 120, .9);
  background: rgba(255, 90, 120, .10);
}