/* global */
:root {
    /* color */
    --color-white:#ffffff;
    --color-light-white:#eeeeee;
    --color-dark-white:#bdbdbd;
    --color-pink:#fe918d;
    --color-dark-pink:#ff6863;
    --color-dark-grey:#4d4d4d;
    --color-grey:#616161;
    --color-light-grey:#7c7979;
    --color-blue:#73aace;
    --color-yellow:#ffff00;
    --color-orange:#ffdab9;
    --color-black:#000000;
    --color-purple:#d8bfd8;
    --color-dark-purple:#dda0dd;
    --color-light-orange:#EDD4BB;
    /* font size */
    --font-large: 48px;
    --font-medium: 28px;
    --font-regular: 18px;
    --font--small: 16px;
    --font-micro: 14px;
    /* font weight */
    --weight-bold: 700;
    --weight-semi-bold: 600;
    --weight-regular: 400;
    /* size */
    --size-border-radius: 4px;
    /* animation */
    --animation-duration: 300ms;
}

/* universal tags */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Open Sans';
    cursor: default;
}

a {
    text-decoration: none;
    color: var(--color-white);
}

ul {
    list-style:none;
    padding-left: 0;
}

li {
    list-style: none;
}

button {
    background-color: transparent;
    cursor: pointer;
    border: none;
    outline: none;
}


/* typography */
h1 {
    font-size: var(--font-large);
    font-weight: var(--weight-bold);
    color: var(--color-black);
    margin: 16px 0px;
}

h2 {
    font-size: var(--font-medium);
    font-weight: var(--weight-semi-bold);
    color: var(--color-black);
    margin: 8px 0px;
}

h3 {
    font-size: var(--font-regular);
    font-weight: var(--weight-regular);
    color: var(--color-black);
    margin: 8px 0px;
}

p {
    font-size: var(--font--small);
    font-weight: var(--weight-regular);
    color: var(--color-black);
    margin: 4px 0px;
}



/* navbar */
#navbar {
    position: fixed;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background-color: var(--color-light-orange);
    transition: all var(--animation-duration) ease-in-out;
}

#navbar.navbar--dark {
    background-color: var(--color-orange);
    padding: 8px;
}




.navbar__menu {
    display: flex;

}

.navbar__logo {
    font-size: var(--font-medium);
    font-weight: var(--weight-semi-bold);
}

.navbar__menu__item {
    padding: 8px 12px;
    margin: 0px 4px;
    cursor: pointer;
    border-radius: var(--size-border-radius);
}

.navbar__menu__item.active {
    border:  1px solid var(--color-white);
    border-radius: var(--size-border-radius);
}

.navbar__menu__item:hover {
    background-color: var(--color-orange);
    border-radius: var(--size-border-radius);
}

.navar__toggle-btn {
    position: absolute;
    top: 24px;
    right: 32px;
    font-size: 24px;
    color: var(--color-black);
    display: none;
}



/* home */
#home {
    background: url("images/home-background.png") center/cover no-repeat;
    padding: 40px;
    padding-top: 120px;
    text-align: center;
}

.home__avatar {
    width: 250px;
    height: 250px;
    border-radius: 70%;
    border: 2px solid var(--color-light-white);
}

.home__title,
.home__description {
    color: var(--color-black);
}

.home__contact {
    font-size: var(--font-regular);
    font-weight: var(--weight-bold);
    margin: 24px;
    padding: 8px 12px;
    border: 2px solid var(--color-white);
    border-radius: var(--size-border-radius);
}
.home__cv {
    font-size: var(--font-regular);
    font-weight: var(--weight-bold);
    margin: 24px;
    padding: 8px 12px;
    border: 2px solid var(--color-white);
    border-radius: var(--size-border-radius);
}

/* section common */
.section {
    padding: 50px;
    text-align: center;
    margin: auto;
}

.section__containter {
    max-width: 1200px;
    margin: auto;
}

/* about */
.about__majors {
    display: flex;
    justify-content: space;
    margin: 80px 0px;
}

.major__icon{
    width: 170px;
    height: 170px;   
    line-height: 170px;
    font-size: 70px;
    margin: auto;
    color: var(--color-dark-grey);
    border: 1px solid var(--color-dark-grey);
    border-radius: 50%;
    margin-bottom: 16px;
}

.major__icon i {
    transition: all var(--animation-duration) ease;
}

.major__icon:hover i {
    color:var(--color-light-grey);
    transform: rotate(-30deg) scale(1.1)
}

.major__title, .major__description {
    color: var(--color-dark-grey);
}

.major__description {
    font-size: var(--font--small);
}

.career {
    display: flex;
}

.career__description {
    margin: 0px 16px;
    text-align: left;
}

.career__name,
.career__period {
    color:var(--color-light-grey);
}

.career_name {
    font-size: var(--font--small);
}

.career_period {
    font-size: var(--font-micro);
}

/* lab */
#lab {
    background-color: var(--color-dark-white);
}

/* projects */
#projects {
    background-color: var(--color-light-white);
}

.projects {
    margin: 40px;
}

.project {
    display: flex;
    margin: 32px 0px;
}

.project__speech-bubble {
   padding: 18px;
   background-color: var(--color-white); 
   border-radius: var(--size-border-radius);
   text-align: left;
}

/* publications */
.publication {
    text-align: left;
}


/* contact */
#contact {
    background-color: var(--color-light-orange);
}

.contact__title, 
.contact__email,
.contact__rights {
    color: var(--color-white);
}

.contact__title {
    margin: 32px 0;
}

.contact__links {
    font-size: var(--font-large);
    margin: 24px 0;
}

.contact__links i:hover {
    transform: scale(1.1);
    transition: all var(--animation-duration) ease;
    color: var(var(--color-dark-pink));
}


/* for below 768px screen width */
@media screen and (max-width: 768px){
    .navbar__toggle-btn {
        display: block;
    }

    #navbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .navbar__menu {
        flex-direction: column;
        text-align: center;
        width: 100%;
        display: none;
    }


    .about__majors {
        flex-direction: column;
    }

    .major {
        margin-bottom: 38px;
    }

    .project {
        flex-grow: 1;
    }

    .project__image {
        width: 100px;
        height: 100px;
    }
}