html, body {
    margin: 0;
    min-height: 100%;
}

body {
    background-color: #111111;
    font-family: 'Roboto', sans-serif;
    min-height: 100vh;
    box-sizing: border-box;
    
    display: flex;
    flex-direction: column;
    align-items: center;

    padding: 100px 0 50px;
}

/* Main heading */
h2 {
    width: 100%;
    max-width: 900px;
    color: lightcyan;
    text-shadow: 0 0 2px lightcyan;
    text-align: center;
}

/* introduction */
.introduction {
    width: 90%;
    max-width: 900px;
    min-height: 450px;

    color: darkgray;
    font-family: 'Roboto', sans-serif;
    text-align: justify;
    
}

/* paragraphs */
.personal-details {
    text-align: justify;
    line-height: 1.6;
    }

/* socials */
nav {
    width: 90%;
    text-align: center;
}

a {
    color: lightcyan;
    text-decoration: none;
    margin-right: 15px;
}

/* bottom */
.bottom-details {
    width: 90%;
    color: darkgray;
    font-size: 10px;
    margin-top: auto;
    text-align: center;
}


/* ON/OFF theme switch */
.theme-switch {
    position: fixed;
    top: 30px;
    right: 30px;

    width: 50px;
    height: 26px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    inset: 0;

    background-color: #444;
    border: 1px solid lightcyan;
    border-radius: 20px;

    cursor: pointer;
    transition: 0.3s;
}

.slider::before {
    content: "";

    position: absolute;
    width: 20px;
    height: 20px;

    left: 2px;
    bottom: 2px;

    background-color: lightcyan;
    border-radius: 50%;

    transition: 0.3s;
}

/* ON */
input:checked + .slider {
    background-color: lightcyan;
}

input:checked + .slider::before {
    transform: translateX(24px);
    background-color: #164e63;
}


/* Know me - slider */
.about-slider {
    width: 90%;
    max-width: 900px;
    margin-top: 30px;
    font-size: 12px;
}

.about-slider h3 {
    color: lightcyan;
}

#info-slider {
    width: 100%;
    cursor: pointer;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    color: darkgray;
    font-size: 12px;
}

#info-level {
    color: lightcyan;
    margin-top: 20px;
}

#about-me {
    color: darkgray;
    line-height: 1.6;
}


/* light mode */

body.light-mode {
    background-color: #f5f5f5;
    color: #111111;
}

body.light-mode h2 {
    color: #164e63;
}

body.light-mode .introduction {
    color: #444444;
}

body.light-mode a {
    color: #164e63;
}

body.light-mode .bottom-details {
    color: #666666;
}

body.light-mode .slider {
    border-color: #164e63;
    color: #164e53;
}


body.light-mode .about-slider h3 {
    color: #164e63;
}

body.light-mode .slider-labels {
    display: flex;
    justify-content: space-between;
    color: #444444;
    font-size: 12px;
}




/* Mobile view */
@media (max-width: 600px) {

    body {
        padding: 80px 0 50px;
    }

    h2 {
        width: 100%;
        font-size: 20px;
    }

    .introduction {
        width: 90%;
        min-height: 350px;
        font-size: 15px;
    }

    .personal-details {
        max-width: 100%;
    }

    nav {
        width: 90%;
    }

    .about-slider {
        width: 90%;
    }

    .bottom-details {
        width: 90%;
    }

    .theme-switch {
        top: 20px;
        right: 20px;
    }
    
}