*{
      margin:0;
      padding:0;
      box-sizing:border-box;
    }

    body{
      font-family: Arial, sans-serif;
      overflow-x: hidden;
      background:#def7ff;
      color:white;
      min-height:100vh;
    }

    /* Navbar */

nav{
    width:100%;
    padding:10px 25px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    background:white;
    border-bottom:1px solid rgba(0,0,0,0.1);
    box-shadow:0 2px 8px rgba(0,0,0,0.08);
}

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

.brand img{
    width:55px;
    height:55px;
    background:white;
    padding:1px;
}

.brand h1{
    font-family:'Orbitron', sans-serif;
    font-size:28px;
    margin-bottom:2%;
    letter-spacing:2px;
}

.mech{
    color:#012043;
}

.circuits{
    color:#004fd6;
}

nav ul{
    display:flex;
    list-style:none;
    align-items: center;
    gap:30px;
}

nav ul li a{
    text-decoration:none;
    color:rgba(0, 44, 201, 0.811);
    transition:0.3s;
    font-size:18px;
    font-family:Arial, sans-serif
}

nav ul li a:hover{
    color:#21cfff;
}

.contact-menu{
    position:relative;
}

.contact-box{
    display:none;
    position:absolute;
    top:35px;
    right:0;
    background:white;
    color:#012043;
    padding:12px 18px;
    border-radius:10px;
    box-shadow:0 4px 12px rgba(0,0,0,0.15);
    width:280px;
    font-family:Arial, sans-serif;
    z-index:1000;
}

.feedback-menu{
    position:relative;
}

.feedback-box{
    display:none;
    position:absolute;
    top:40px;
    right:0;
    width:290px;
    background:white;
    color:#012043;
    padding:15px;
    border-radius:10px;
    box-shadow:0 4px 12px rgba(0,0,0,0.15);
    font-family:Arial, sans-serif;
    z-index:1000;
}

    /* Hero Section */
    .hero{
      display:flex;
      flex-direction:column;
      justify-content:top;
      align-items:center;
      text-align:center;
      height:85vh;
      padding:20px;
    }

    .hero h2{
      font-size:50px;
      color:#012043;
      margin-bottom:5px;
    }

    .hero p{
      max-width:750px;
      font-size:18px;
      line-height:1;
      color:#004fd6;
      margin-bottom:10px;
    }

    /* Features */
    .features{
      display:flex;
      flex-wrap:wrap;
      justify-content:center;
      gap:25px;
      padding:50px;
    }

    .card{
      width:250px;
      height:250px;
      display:flex;
      flex-direction:column;
      justify-content:center;
      align-items:center;
      background:rgb(255, 255, 255);
      border:1px solid rgba(255,255,255,0.08);
      box-shadow:0 0 10px rgba(0, 0, 0, 0.1);
      padding:30px;
      border-radius:20px;
      transition:0.3s;
    }

    .card:hover{
      transform:translateY(-8px);
      border-color:#00e5ff;
      box-shadow:0 0 20px rgba(0,229,255,0.3);
    }

    .card-link{
    text-decoration:none;
}

/* Center Battery */
.battery-container{
    display:flex;
    justify-content:center;
    align-items:center;
    margin-bottom:25px;
}

/* Battery Body */
.battery{
    width:90px;
    height:45px;
    border:3px solid #000000;
    border-radius:1px;
    position:relative;
    overflow:hidden;
}

/* Half Fill */
.battery-level{
    width:70%;
    height:100%;
    background:#000000;
}

/* Question Mark */
.question{
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%, -50%);
    color:white;
    font-size:28px;
    font-weight:bold;
}

/* Battery Tip */
.battery-tip{
    width:8px;
    height:18px;
    background:#000000;
    border-radius:0 0px 0px 0;
    margin-left:4px;
}

    .card h3{
      color:#012043;
      margin-bottom:15px;
    }

    .card p{
      color:#004fd6;
      line-height:1.6;
    }

    footer{
      text-align:center;
      padding:20px;
      color:#888;
      border-top:1px solid rgba(255,255,255,0.08);
    }

  @media (max-width: 768px){

  nav{
    flex-direction: row;   /* important change */
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    position: relative;
  }

  nav ul{
    display: none;  /* hide menu by default */
    flex-direction: column;
    gap: 12px;
    padding: 10px 0;
    width: 100%;
    background: white;
    position: absolute;
    top: 70px;
    left: 0;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    z-index: 999;
  }

  nav ul.show{
    display: flex; /* show when hamburger clicked */
  }

  .brand h1{
    font-size: 22px;
    text-align: center;
  }

  .hero{
    height: auto;
    padding: 30px 15px;
  }

  .hero h2{
    font-size: 32px;
  }

  .hero p{
    font-size: 15px;
    line-height: 1.4;
  }

  .features{
    padding: 20px 10px;
    gap: 15px;
  }

  .card{
    width: 90%;
    height: auto;
    padding: 20px;
  }

  .card h3{
    font-size: 18px;
  }

  .card p{
    font-size: 14px;
  }

  .menu-toggle{
  display: block;
}
}

.menu-toggle{
  display: none;
  font-size: 28px;
  cursor: pointer;
  color: #012043;
}