:root{
  --bg:#0b1220;
  --panel:#0f1a33;
  --card:#122044;
  --text:#eaf0ff;
  --muted:#b8c4ff;
  --line:rgba(255,255,255,.12);
  --accent:#5eead4;
  --accent2:#60a5fa;
  --danger:#fb7185;
  --shadow: 0 10px 24px rgba(0,0,0,.35);
  --radius: 18px;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: radial-gradient(1200px 600px at 10% 0%, rgba(96,165,250,.16), transparent),
              radial-gradient(900px 500px at 90% 20%, rgba(94,234,212,.12), transparent),
              var(--bg);
  color:var(--text);
}

.topbar{
  position:sticky; top:0; z-index:10;
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 16px;
  background: rgba(11,18,32,.9);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}

.brand{display:flex; gap:12px; align-items:center}
.logo{
  width:44px;height:44px;border-radius:14px;
  display:grid;place-items:center;
  background: linear-gradient(135deg, rgba(94,234,212,.18), rgba(96,165,250,.18));
  border:1px solid var(--line);
  box-shadow: var(--shadow);
  font-size:20px;
}
.title{font-weight:800; letter-spacing:.2px}
.subtitle{color:var(--muted); font-size:12px}
.topActions{display:flex; gap:10px; align-items:center}

.container{max-width: 1100px; margin: 0 auto; padding: 18px;}
.footer{margin-top:24px; padding:18px 0; border-top:1px solid var(--line);}

.card{
  background: rgba(18,32,68,.65);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding:16px;
  box-shadow: var(--shadow);
  margin-bottom:14px;
}

.grid{display:grid; gap:14px}
.grid.two{grid-template-columns: repeat(2, minmax(0,1fr));}
.grid.three{grid-template-columns: repeat(3, minmax(0,1fr));}
@media (max-width: 900px){
  .grid.two,.grid.three{grid-template-columns:1fr}
}

.h1{font-size:28px; margin:0 0 8px 0;}
.h2{font-size:18px; margin:0 0 10px 0;}
.p{color:var(--muted); margin:0 0 10px 0; line-height:1.6;}
.small{color:var(--muted); font-size:12px; line-height:1.5}

.row{display:flex; gap:10px; flex-wrap:wrap; align-items:center; justify-content:space-between}

.badge{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text);
  font-size:12px;
}

.btn{
  border:1px solid var(--line);
  background:rgba(255,255,255,.06);
  color:var(--text);
  padding:10px 12px;
  border-radius:14px;
  cursor:pointer;
  font-weight:700;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}
.btn:hover{background:rgba(255,255,255,.09)}
.btn.primary{
  border-color: rgba(94,234,212,.35);
  background: rgba(94,234,212,.12);
}
.btn.primary:hover{background: rgba(94,234,212,.18)}
.btn.secondary{
  border-color: rgba(96,165,250,.35);
  background: rgba(96,165,250,.12);
}
.btn.secondary:hover{background: rgba(96,165,250,.18)}
.btn.danger{
  border-color: rgba(251,113,133,.35);
  background: rgba(251,113,133,.10);
}
.btn.danger:hover{background: rgba(251,113,133,.16)}
.btn.ghost{
  background: transparent;
}

input[type="text"], input[type="email"], input[type="password"], textarea{
  width:100%;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text);
  border-radius:14px;
  padding:10px 12px;
  outline:none;
}
textarea{min-height:100px; resize:vertical;}

.progressWrap{
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  border-radius:999px;
  overflow:hidden;
  height:12px;
}
.progressBar{height:100%; width:0% ; background: linear-gradient(90deg, rgba(94,234,212,.9), rgba(96,165,250,.9));}

hr{border:none; border-top:1px solid var(--line); margin:14px 0;}

.quizOption{
  display:flex; gap:10px; align-items:flex-start;
  padding:10px 12px;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(255,255,255,.04);
  cursor:pointer;
  margin-bottom:10px;
}
.quizOption:hover{background:rgba(255,255,255,.07)}
.quizOption input{margin-top:4px;}

.btn:disabled{
  opacity: .5;
  cursor: not-allowed;
}
.lockNote{
  color: var(--muted);
  font-size: 12px;
  margin-top: 8px;
}