* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family:'Poppins',sans-serif;
  background:linear-gradient(135deg,#0f0f23 0%,#1a1a2e 25%,#16213e 50%,#0f3460 75%,#533483 100%);
  min-height:100vh; overflow-x:hidden; position:relative; color:#fff;
}
body::before {
  content:''; position:fixed; inset:0;
  background-image:
    radial-gradient(circle at 20% 50%,#00ffff15 0%,transparent 50%),
    radial-gradient(circle at 80% 20%,#ff00ff15 0%,transparent 50%),
    linear-gradient(90deg,rgba(0,255,255,0.03) 1px,transparent 1px),
    linear-gradient(rgba(0,255,255,0.03) 1px,transparent 1px);
  background-size:100% 100%,100% 100%,40px 40px,40px 40px;
  z-index:-1;
  animation:cyberPulse 4s ease-in-out infinite alternate;
}
@keyframes cyberPulse { 0%{opacity:0.3}100%{opacity:0.6} }

.cyber-header {
  background:rgba(0,0,0,0.95); backdrop-filter:blur(20px);
  border-bottom:2px solid #00ffff; position:sticky; top:0; z-index:1000;
  box-shadow:0 4px 30px rgba(0,255,255,0.3);
}
.navbar-brand {
  font-size:1.8rem; font-weight:800; color:#00ffff!important;
  text-shadow:0 0 10px rgba(0,255,255,0.5);
  display:flex; align-items:center; gap:10px;
}
.brand-icon { font-size:2rem; animation:shield-glow 2s ease-in-out infinite alternate; }
@keyframes shield-glow {
  0%{text-shadow:0 0 5px rgba(0,255,255,0.5)}
  100%{text-shadow:0 0 20px rgba(0,255,255,0.8),0 0 30px rgba(0,255,255,0.4)}
}
.nav-link { color:rgba(255,255,255,0.85)!important; font-weight:600; position:relative; }
.nav-link:hover { color:#00ffff!important; }
.cyber-btn {
  background:linear-gradient(135deg,#00ffff,#0080ff);
  border:none; color:#000; font-weight:700; border-radius:25px;
  padding:10px 22px; text-decoration:none; display:inline-block;
  transition:transform .2s ease, box-shadow .2s ease;
}
.cyber-btn:hover { transform:translateY(-2px); box-shadow:0 10px 30px rgba(0,255,255,0.35); }

.hero-section { padding:80px 0 40px; text-align:center; position:relative; }
.hero-title {
  font-size:3.2rem; font-weight:900;
  background:linear-gradient(135deg,#00ffff,#ff00ff,#ffff00);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
  margin-bottom:16px; animation:title-glow 3s ease-in-out infinite alternate;
}
@keyframes title-glow { 0%{filter:drop-shadow(0 0 10px rgba(0,255,255,0.3))}100%{filter:drop-shadow(0 0 30px rgba(255,0,255,0.6))} }
.hero-subtitle { color:rgba(255,255,255,0.9); max-width:720px; margin:0 auto 24px; }

.scorebar {
  max-width: 980px; margin: 10px auto 0; padding: 8px 12px; border:1px solid #00ffff55; border-radius: 12px;
  background: rgba(0,0,0,0.35); display:flex; align-items:center; justify-content:space-between; gap:12px;
  font-size: 0.95rem;
}
.scorebar .bar {
  flex:1; height:10px; background:#0d223d; border-radius:999px; overflow:hidden;
  box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}
.scorebar .fill {
  height:100%; width:0%; background:linear-gradient(90deg,#12fff7,#00d1ff);
  transition:width .4s ease;
}
.scorebar .num { min-width:110px; text-align:right; color:#c8f6ff; }

.topics-grid {
  display:grid; grid-template-columns:repeat(auto-fit, minmax(300px,1fr));
  gap:30px; margin:30px 0 70px;
}
.topic-card { perspective:1000px; height:420px; cursor:pointer; }
.card-inner {
  position:relative; width:100%; height:100%;
  transition:transform 0.8s cubic-bezier(0.4,0,0.2,1); transform-style:preserve-3d;
}
.topic-card:hover .card-inner { transform:rotateY(180deg); }
.card-front, .card-back {
  position:absolute; inset:0; backface-visibility:hidden; border-radius:20px; padding:22px;
  box-shadow:0 15px 40px rgba(0,0,0,0.35); border:2px solid var(--topic-color);
  display:flex; flex-direction:column; overflow:hidden;
}
.card-front { background:rgba(255,255,255,0.96); color:#1a1a2e; justify-content:center; align-items:center; }
.card-back { background:linear-gradient(135deg,var(--topic-color),var(--topic-secondary)); color:white; transform:rotateY(180deg); }
.topic-icon { font-size:3.2rem; margin-bottom:10px; color:var(--topic-color); }
.topic-title { font-size:1.35rem; font-weight:800; margin-bottom:8px; }
.topic-description { font-size:0.95rem; opacity:0.8; text-align:center; max-width:280px; }
.security-level {
  position:absolute; top:12px; right:12px; background:var(--topic-color); color:#fff;
  padding:4px 10px; border-radius:12px; font-size:0.7rem; font-weight:800;
}
.back-content { display:flex; flex-direction:column; gap:10px; height:100%; }
.back-content h3 { font-size:1.05rem; font-weight:800; margin:0; }
.back-tips { list-style:none; margin:0; padding:0 2px; }
.back-tips li { font-size:0.9rem; line-height:1.35; margin-bottom:6px; }

.quiz {
  margin-top:auto; background:rgba(0,0,0,0.25); border:1px solid rgba(255,255,255,0.25);
  border-radius:12px; padding:10px;
}
.quiz h4 { font-size:0.95rem; margin:0 0 6px; }
.quiz .options { display:grid; gap:6px; }
.quiz label { font-weight:600; font-size:0.9rem; display:flex; align-items:center; gap:8px; }
.quiz button {
  margin-top:8px; border:0; padding:8px 12px; border-radius:10px; font-weight:800;
  background:#fff; color:#111; cursor:pointer;
}
.quiz .result { margin-top:6px; font-weight:700; }
.badge-score {
  position:absolute; left:12px; top:12px; background:#111; color:#0ff; border:1px solid #0ff7;
  padding:3px 8px; border-radius:10px; font-size:0.75rem; font-weight:800;
}

.passwords { --topic-color:#ff6b6b; --topic-secondary:#ff5252; }
.privacy { --topic-color:#4ecdc4; --topic-secondary:#26a69a; }
.phishing { --topic-color:#ffd93d; --topic-secondary:#ffcc02; }
.social-media { --topic-color:#6c5ce7; --topic-secondary:#5f27cd; }
.cyberbullying { --topic-color:#fd79a8; --topic-secondary:#e84393; }
.downloads { --topic-color:#00b894; --topic-secondary:#00a085; }
.screen-time { --topic-color:#0984e3; --topic-secondary:#74b9ff; }
.digital-footprint { --topic-color:#e17055; --topic-secondary:#d63031; }

.cyber-particles { position:fixed; inset:0; pointer-events:none; z-index:-1; }
.particle { position:absolute; width:2px; height:2px; background:#00ffff; border-radius:50%; animation:float 6s linear infinite; }
@keyframes float {
  0%{transform:translateY(100vh) translateX(0); opacity:0;}
  10%{opacity:1;} 90%{opacity:1;}
  100%{transform:translateY(-100px) translateX(100px); opacity:0;}
}

footer {
  border-top: 2px solid #00ffff55; background: rgba(0,0,0,0.65);
  backdrop-filter: blur(10px);
  padding: 18px 0; color: #c8f6ff; text-align: center;
}
footer .brand { color:#00ffff; font-weight:800; }