:root{
  --bg:#050A14;
  --bg2:#081428;
  --card:#0B1A33;
  --blue:#1A6EE8;
  --blue2:#3B8FF5;
  --cyan:#00D4FF;
  --text:#E6EEF8;
  --muted:#8AA0BC;
  --border:rgba(96,207,255,.15);
  --green:#22c55e;
  --red:#ef4444;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{background:var(--bg);color:var(--text);font-family:'Hind Siliguri','DM Sans',sans-serif;min-height:100vh}

/* NAV */
.quiz-nav{
  display:flex;justify-content:space-between;align-items:center;
  padding:18px 5%;border-bottom:1px solid var(--border);
  background:rgba(5,10,20,.8);backdrop-filter:blur(10px);
  position:sticky;top:0;z-index:100;
}
.logo-img{height:42px}
.back-home{
  color:var(--text);text-decoration:none;font-size:14px;
  padding:10px 18px;border:1px solid var(--border);border-radius:10px;
  transition:.3s;display:inline-flex;align-items:center;gap:8px;
}
.back-home:hover{background:var(--blue);border-color:var(--blue)}

/* SCREENS */
.quiz-screen{display:none;min-height:calc(100vh - 80px);padding:40px 5%}
.quiz-screen.active{display:flex;align-items:center;justify-content:center;animation:fadeIn .4s}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

.quiz-container{max-width:1100px;width:100%;text-align:center}
.eyebrow{
  display:inline-block;font-family:'DM Sans',sans-serif;font-size:11px;
  letter-spacing:3px;text-transform:uppercase;color:var(--cyan);
  padding:6px 16px;border:1px solid var(--border);border-radius:50px;margin-bottom:20px;
}
h1{
  font-family:'Playfair Display',serif;font-size:clamp(32px,5vw,52px);
  font-weight:900;margin-bottom:14px;line-height:1.15;
}
h1 em{color:var(--cyan);font-style:italic;font-weight:400}
.subtitle{color:var(--muted);font-size:16px;margin-bottom:40px}

/* LEVEL CARDS */
.level-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:20px;margin-top:20px;
}
.level-card{
  background:var(--card);border:1px solid var(--border);border-radius:18px;
  padding:30px 24px;cursor:pointer;transition:.4s;text-align:left;
  position:relative;overflow:hidden;
}
.level-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
  transform:scaleX(0);transition:.4s;transform-origin:left;
}
.level-card:hover{transform:translateY(-6px);border-color:var(--cyan);box-shadow:0 20px 50px rgba(0,212,255,.15)}
.level-card:hover::before{transform:scaleX(1)}
.level-badge{
  display:inline-block;font-family:'Playfair Display',serif;font-size:28px;
  font-weight:900;color:var(--cyan);background:rgba(0,212,255,.1);
  padding:8px 20px;border-radius:10px;border:1px solid rgba(0,212,255,.3);margin-bottom:18px;
}
.level-card h3{font-size:20px;margin-bottom:8px}
.level-card p{color:var(--muted);font-size:13px;margin-bottom:18px}
.start-tag{
  display:inline-flex;align-items:center;gap:8px;color:var(--cyan);
  font-size:13px;font-weight:600;
}

/* QUIZ PLAY */
.quiz-play{max-width:800px}
.quiz-top{
  display:flex;justify-content:space-between;align-items:center;
  margin-bottom:20px;flex-wrap:wrap;gap:12px;
}
.quiz-level-tag,.quiz-score-tag{
  background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.3);
  color:var(--cyan);padding:8px 18px;border-radius:50px;
  font-weight:600;font-size:14px;
}
.quiz-progress-text{color:var(--muted);font-size:14px}

.progress-wrap{
  height:8px;background:var(--card);border-radius:50px;
  overflow:hidden;margin-bottom:30px;
}
.progress-bar{
  height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));
  width:0;transition:.5s;border-radius:50px;
}

.question-card{
  background:var(--card);border:1px solid var(--border);border-radius:20px;
  padding:40px 30px;margin-bottom:24px;
}
.question-text{
  font-size:clamp(20px,3vw,26px);margin-bottom:30px;
  line-height:1.5;font-weight:600;
}
.options-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:600px){.options-grid{grid-template-columns:1fr}}
.option{
  background:var(--bg2);border:2px solid var(--border);border-radius:12px;
  padding:18px 20px;cursor:pointer;transition:.3s;text-align:left;
  font-size:15px;color:var(--text);font-family:inherit;font-weight:500;
}
.option:hover:not(.disabled){border-color:var(--cyan);background:rgba(0,212,255,.05);transform:translateX(4px)}
.option.correct{border-color:var(--green);background:rgba(34,197,94,.15);color:#86efac}
.option.wrong{border-color:var(--red);background:rgba(239,68,68,.15);color:#fca5a5}
.option.disabled{cursor:not-allowed;opacity:.6}

.feedback{
  margin-top:20px;padding:14px;border-radius:10px;font-weight:600;
  display:none;animation:fadeIn .3s;
}
.feedback.show{display:block}
.feedback.correct{background:rgba(34,197,94,.1);color:#86efac;border:1px solid rgba(34,197,94,.3)}
.feedback.wrong{background:rgba(239,68,68,.1);color:#fca5a5;border:1px solid rgba(239,68,68,.3)}

.next-btn{
  background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;
  border:none;padding:16px 40px;border-radius:12px;font-size:15px;font-weight:700;
  cursor:pointer;transition:.3s;font-family:inherit;
  display:inline-flex;align-items:center;gap:10px;
}
.next-btn:hover:not(:disabled){transform:translateY(-3px);box-shadow:0 15px 35px rgba(26,110,232,.4)}
.next-btn:disabled{opacity:.4;cursor:not-allowed}

/* RESULT */
.result-box{max-width:600px}
.result-icon{
  font-size:60px;color:var(--cyan);margin-bottom:20px;
  animation:bounce 1s ease;
}
@keyframes bounce{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-15px)}
}
.score-circle{
  width:200px;height:200px;margin:30px auto;
  border-radius:50%;background:var(--card);
  border:4px solid var(--cyan);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  box-shadow:0 0 60px rgba(0,212,255,.3);
}
.score-num{font-family:'Playfair Display',serif;font-size:56px;font-weight:900;color:var(--cyan)}
.score-num small{font-size:24px;color:var(--muted)}
.score-percent{font-size:18px;color:var(--text);font-weight:600}
.result-msg{color:var(--muted);font-size:16px;margin-bottom:30px}
.result-stats{
  display:flex;justify-content:center;gap:30px;
  margin-bottom:30px;flex-wrap:wrap;
}
.rs{
  display:flex;align-items:center;gap:10px;
  background:var(--card);padding:12px 22px;border-radius:50px;
  border:1px solid var(--border);font-size:14px;
}
.result-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn-primary,.btn-ghost{
  padding:14px 28px;border-radius:12px;font-size:14px;font-weight:600;
  cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:10px;
  border:none;font-family:inherit;transition:.3s;
}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 15px 35px rgba(26,110,232,.4)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--cyan);background:rgba(0,212,255,.05)}