:root{
    --primary-color: #2b5876;
    --secondary-color: #4e4376;
    --weak-color:#fc8181;
    --medium-color:#fbd38d;
    --strong-color:#68d391;
}

*{
    margin:0;
    padding:0;
    box-sizing: border-box;
    font-family:sans-serif;
}

body{
    background:linear-gradient(45deg,var(--primary-color),var(--secondary-color));
    display:flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container{
    background-color: #fff;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.85);
    width:90%;
    max-width: 450px;
}

h1{
    text-align:center;
    margin-bottom: 1.8rem;
    color:var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
    position:relative;
    padding-bottom: 0.5rem;
}

h1::after{
    content: "";
    position:absolute;
    bottom:0;
    height:3px;
    background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));
    left:50%;
    width:50%;
    transform:translate(-50%);
    border-radius: 3px;
   
}

.password-container{
    margin-bottom: 2rem;
    background-color: #f8fafc;
    border-radius:10px;
    border:1px solid #e2e8f0;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display:flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem 0 0;
}

#password{
    width:100%;
    padding: 1.1rem;
    padding-right: 50px;
    border: none;
    background: transparent;
    color:#4a5568;
    letter-spacing:1px;
    outline:none;
    border-radius:10px;
}

#copy-btn{
    cursor: pointer;
    color:#718096;
    font-size: 1.1rem;
    width:35px;
    height:35px;
    display:flex;
    align-items: center;
    justify-content: center; 
    border-radius: 50%;
}

#copy-btn:hover{
    color:var(--primary-color);
}

.options{
    margin-bottom: 2rem;
    background-color: #f8fafc;
    padding:1.5rem;
    border-radius:10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.option{
    display:flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.option:last-child{
    margin-bottom: 0;
}
.option label{
    font-size: 0.9rem;
    color:#4a5568;
    font-weight: 500;
}

.range-container{
    display:flex;
    align-items: center;
    gap: 10px;
    width:60%;
}

input[type="range"]{
    accent-color:var(--primary-color);
    height:5px;
    cursor: pointer;
    flex:1;
}

#length-value{
    font-weight: 600;
    color:var(--primary-color);
    text-align: center;
    background: #e2e8f0;
    border-radius: 4px;
    width: 30px;
}

input[type="checkbox"]{
    width:20px;
    height:20px;
    border:2px solid var(--primary-color);
    appearance: none;
    border-radius: 4px;
    cursor:pointer;
    outline:none;
    position: relative;
    transition: all 0.3s;

}

input[type="checkbox"]:checked{
    background-color: var(--primary-color);
}

input[type="checkbox"]:checked::after{
    content: "\2714";
    position:absolute;
    color:white;
    left:50%;
    top:50%;
    transform: translate(-50%,-50%);
    font-size:12px;
}

button{
    width: 100%;
    padding: 1rem;
    background: linear-gradient(45deg,var(--primary-color),var(--secondary-color));
    color:white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 8px rgba(43,88,118,0.1);
}

button:hover{
    transform: translateY(-5px);
}

button:active{
    transform: translateY(0);
}

.strength-container{
    margin-top: 0.8rem;
}

.strength-container p{
    font-size: 0.9rem;
    color:#4a5568;
    margin-bottom: 0.6rem;
    display:flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}

.strength-label{
    color: var(--primary-color);
    font-weight: 700;
}

.strength-meter{
    height:10px;
    background-color: #edf2f7;
    border-radius: 5px;
    margin-top: 0.6rem;
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}

.strength-bar{
    height:100%;
    width:0;
    min-width: 5%;
    background-color: var(--weak-color);
    transition: all 0.3s;
    border-radius: 5px;
}

@media (max-width: 768px){
    .container{
        width:95%;
        padding: 1.8rem;
    }
    h1{
        font-size: 1.6rem;
    }
    .option label{
        font-size: 0.9rem;
    }
}