*{
  box-sizing: border-box;
}

body{
  margin: 0;
  font-family: Arial, sans-serif;
  background: #05070d;
  color: #d1ffd7;
}

.navbar{
  background: #020408;
  border-bottom: 1px solid #00ff88;
  text-align: center;
  padding: 14px 10px;
}

.navbar a{
  color: #00ff88;
  text-decoration: none;
  margin: 0 15px;
  font-weight: bold;
  letter-spacing: 0.5px;
}

.navbar a:hover{
  color: #ffffff;
}

.hero{
  text-align: center;
  padding: 40px 20px;
  background: linear-gradient(135deg, #03110a, #071b12, #0b2b1a);
  border-bottom: 1px solid #00ff88;
}

.hero h1{
  margin: 20px 0 10px;
  font-size: 52px;
  color: #00ff88;
  text-shadow: 0 0 10px rgba(0,255,136,0.45);
}

.hero p{
  margin: 0;
  font-size: 20px;
  color: #d1ffd7;
}

.home-btn{
  display: inline-block;
  margin-bottom: 20px;
  padding: 10px 20px;
  background: transparent;
  color: #00ff88;
  text-decoration: none;
  border: 1px solid #00ff88;
  border-radius: 8px;
  font-weight: bold;
  box-shadow: 0 0 10px rgba(0,255,136,0.15);
}

.home-btn:hover{
  background: #00ff88;
  color: #03110a;
}

.intro,
.extra{
  max-width: 1100px;
  margin: 30px auto;
  background: #0a1118;
  border: 1px solid #00ff88;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 0 14px rgba(0,255,136,0.08);
}

.intro h2,
.extra h2{
  margin-top: 0;
  color: #00ff88;
}

.intro p,
.extra li{
  color: #d1ffd7;
  line-height: 1.7;
}

.tips-container{
  max-width: 1100px;
  margin: 30px auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.tip-card{
  background: #0a1118;
  border: 1px solid #00ff88;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 0 14px rgba(0,255,136,0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tip-card:hover{
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(0,255,136,0.18);
}

.tip-card h3{
  margin-top: 0;
  color: #00ff88;
  font-size: 24px;
}

.tip-card p{
  color: #d1ffd7;
  line-height: 1.7;
}

.extra ul{
  padding-left: 22px;
}

footer{
  text-align: center;
  padding: 20px;
  margin-top: 30px;
  color: #00ff88;
  border-top: 1px solid #00ff88;
  background: #020408;
}

@media (max-width: 768px){
  .hero h1{
    font-size: 38px;
  }

  .hero p{
    font-size: 17px;
  }

  .navbar a{
    display: inline-block;
    margin: 8px;
  }
}