*{
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    text-decoration: none;
    list-style: none;
    box-sizing: border-box;
}

:root{
    --color-primary: #277b67;
    --color-success: #00bf49;
    --color-warning: #f7c94b;
    --color-danger: rgb(221, 0, 44);
    --color-danger-variant: rgba(247, 88, 66, 0.4);
    --color-white: #fff;
    --color-light: rgba(255, 255, 255, 0.7);
    --color-black: #de5499;
    --color-bg: #2e3047;
    --color-bg1: #3c3f58;
    --color-bg2: #43455c;

    --container-width-lg: 80%;
    --container-width-md: 90%;
    --container-width-sm: 94%;

    --transition: all 400ms ease;
}

body{
    font-family: sans-serif;
    line-height: 1.7;
    color: var(--color-white);
    background: var(--color-bg);
    overflow-x: hidden;
}

/*GENERALS*/

.container{
    width: var(--container-width-lg);
    margin: 0 auto;
}

section{
    padding: 6rem 0;
}

section h2{
    text-align: center;
    margin-bottom: 4rem;
}

h1, h2, h3, h4, h5{
    line-height: 1.2;
}

h1{
    font-size: 2.4rem;
}

h2{
    font-size: 2rem;
}

h3{
    font-size: 1.6rem;
}

h4{
    font-size: 1.3rem;
}

a{
    color: var(--color-white);
}

img{
    width: 100%;
    display: block;
    object-fit: cover;
}

.back-top-btn{
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--color-bg);
    color: var(--color-white);
    font-weight: bolder;
    width: 70px;
    height: 70px;
    z-index: 1;
    border-radius: 100%;
    display: grid;
    place-items: center;
    box-shadow: 1px 1px 6px rgb(31, 31, 31);
    transition: all .5s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 4;
  

}


.back-top-btn:is(:hover, :focus-visible){
    background-color:  var(--color-primary);
    color: var(--color-bg);

}

.back-top-btn.active{
    opacity: 1;
    visibility: visible;
}

.reveal{
    position: relative;
    transform: translateY(150px);
    opacity: 0;
    transition: all 1s ease;
}


.reveal.active{
    transform: translateY(0px);
    opacity: 1;
}

.span-text{
    color: var(--color-danger);
    text-decoration: underline;
    font-family: monospace;
}

.btn{
    display: inline-block;
    background: var(--color-white);
    color: var(--color-black);
    padding: .5rem 1rem;
    border: 1px solid transparent;
    font-weight: 500;
    transition: var(--transition);
    border-radius: 10px;
}

.btn:hover{
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-primary{
    background: var(--color-danger);
    color: var(--color-white);
}



/*PRELOADER SECTION*/
.preloader{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-primary);
    z-index: 10;
    display: grid;
    place-content: center;
    justify-items: center;
    transition: all 1s ease-in;
}

.preloader > * {
    transition: all 1s ease-in;
}

.preloader.loaded > *{
    opacity: 0;
} 

.preloader.loaded{
    transition-delay: 250ms;
    transform: translateY(100%);
}

.circle{
    width: 112px;
    height: 112px;
    border-radius: 100%;
    border: 3px solid var(--color-bg);
    border-block-start-color: var(--color-primary);
    margin-block-end: 55px;
   
    animation: rotate360 1s linear infinite;
}

@keyframes rotate360{
    0%{transform : rotate(0);}
    100% {transform: rotate(1turn);}
}

.preloader .text{
    background-image: url(/img/cover.jpg);
    background-size: 500%;
    font-size: calc(2rem + 3rem);
    font-weight: 500;
    line-height: 1em;
    text-transform: uppercase;
    letter-spacing: 16px;
    padding-inline-start: 16px;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-stroke: 0.5px black;
    animation: loadingText linear 2s infinite; 
}

@keyframes loadingText{
    0%{
        background-position: 100%;
    }

    100%{
        background-position: 0%;
    }
}

/*NAVBAR*/
nav{
    background: transparent;
    width: 100vw;
    height: 5rem;
    position: fixed;
    top: 0;
    z-index: 1;
    transition: var(--transition);
}

.window-scroll{
     background: var(--color-primary);
     box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.7);
}

.nav_container{
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
   
}

nav button{
    display: none;
}

.nav_menu{
    display: flex;
    align-items: center;
    gap: 4rem;
}

.nav_menu a{
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav_menu a:hover{
   color: var(--color-bg2);
}

/*HEADER*/

header{
    position: relative;
    overflow: hidden;
    height: 100vh;
    background-image: linear-gradient(to bottom, var(--color-primary) 5%, rgba(59, 186, 156, 0)), url(./images/cover.jpg);
    background-position: center;
    background-size: cover;
}

.header_container{
    align-items: center;
    margin: 13rem auto;
    text-align: center;
}

.header_left p{
    margin: 1rem 0 2.4rem;
}

.waves{
    position: absolute;
    bottom: 0;
    width: 100%;
    left: 0;
}




/*CATEGORY*/

.categories{
    background: var(--color-bg1);
    height: 26rem;
}

.wave{
    position: absolute;
    bottom: 0;
    width: 100%;
    left: 0;
}

.categories h1{
    line-height: 1;
    margin-bottom: 3rem;
}

.categories_container{
    display: grid;
    grid-template-columns: 30% 72%;
    gap: 3rem;
}

.categories_left p{
    margin: 1rem 0 3rem;
}

.categories_right{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
    margin-right: 2rem;
}

.category{
    background: var(--color-bg2);
    padding: 1.5rem;
    border-radius: 2rem;
    transition: var(--transition);
}

.category:hover{
    box-shadow: 0 3rem 3rem rgba(0, 0, 0, 0.538);
    z-index: 1;
}
 
.category:nth-child(2) .category_icon{
    background: var(--color-danger);
}

.category:nth-child(3) .category_icon{
    background: var(--color-success);
}

 

.category:nth-child(6) .category_icon{
    background: var(--color-black);
}


.category:nth-child(1) .category_icon{
    background: var(--color-warning);
}

.category_icon{
    background: var(--color-primary);
    padding: 0.7rem;
    border-radius: 0.9rem;
}

.category h5{
    margin: 2rem 0 1rem;
}

.category p{
    font-size: 0.85rem;
}

.courses{
    margin-top: 6rem;
}

.courses_container{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.course{
    background: var(--color-bg2);
    text-align: center;
    transition: var(--transition);
    box-shadow: 5px 5px 12px #1c1c24, -5px -5px 12px #2e3255;
    border-radius: 15px;
}


.course:hover{
    box-shadow: 1px 2px 5px rgba(0, 0, 0, 0.768);
}

.course_img{
   margin: 4% auto;
}

.course_info{
    padding: 2rem;
}

.course_info p{
    margin: 1.2rem 0 2rem;
    font-size: 0.9rem;
}

.faqs{
    background: var(--color-bg1);
    box-shadow: inset 0 0 3rem rgba(0, 0, 0, 0.648);
}

.faqs_container{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.faq{
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.4rem;
    height: fit-content;
    background: var(--color-primary);
    cursor: pointer ;
    border-radius: 5px;
}

.faq h4{
    font-size: 1rem;
    line-height: 2.2;
}

.faq_icon{
    align-self: flex-start;
    font-size: 1.2rem;
}

.faq p{
    margin-top: 0.8rem;
    display: none;
}

.faq.open p{
    display: block;
}

.testimonial_container{
    overflow-x: hidden;
    position: relative;
    margin-bottom: 5rem;
}

.testimonial{
    padding-top: 2rem;
}

.avatar{
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 1rem;
    border: 1rem solid var(--color-bg1);
}

.testimonial_info{
    text-align: center;
}

.testimonial_body{
    background: var(--color-primary);
    padding: 2rem;
    position: relative;
    margin-top: 3rem;
}

.testimonial_body::before{
    content: "";
    display: block;
    background: linear-gradient(135deg,
    transparent,
    var(--color-primary),
    var(--color-primary),
    var(--color-primary));
    width: 3rem;
    height: 3rem;
    position: absolute;
    left: 50%;
    top: -1.5rem;
    transform: rotate(45deg);
}

.footer{
    background: var(--color-bg1);
    padding-top: 5rem;
    font-size: 0.9rem;
}

.footer_container{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5rem;
}

.footer_container > div h4{
    margin-bottom: 1.2rem;
}

.footer_1 p{
    margin: 1rem 0 2rem;
}

.footer ul li{
    margin-bottom: 0.7rem;
}

.footer ul li a:hover{
    text-decoration: underline;
}

.footer_socials{
    display: flex;
    gap: 1rem;
    font-size: 1.2rem;
    margin-top: 2rem;
}

.footer_copyright{
    text-align: center;
    margin-top: 4rem;
    padding: 1.2rem 0;
    border-top: 1px solid var(--color-bg2);
}

/*ABOUT*/
.about_achievements{
    margin-top: 3rem;
}

.about_achievements_container{
    display: grid;
    grid-template-columns: 40% 60%;
    gap: 5rem;
}

.about_achievements-right > p {
    margin: 1.6rem 0 2.5rem;
}

.achievements_cards{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.achievement-card{
    background: var(--color-bg2);
    padding: 1.6rem;
    border-radius: 1rem;
    text-align: center; 
    transition: all 400ms ease;
}

.achievement-card:hover{
    background: var(--color-bg1);
    box-shadow: 0 3rem 3rem rgba(0, 0, 0, 0.3);
}

.achievement_icon{
    background: var(--color-danger);
    padding: 0.3rem;
    border-radius: 1rem;
    display: inline-block;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.team{
    background: var(--color-bg1);
    box-shadow: inset 0 0 3rem rgba(0, 0, 0, 0.3);
}

.team_container{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.team_member{
    background: var(--color-bg2);
    padding: 2rem;
    border: 1px solid transparent;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border-radius: 10px;
}

.team_member:hover{
    background: transparent;
    border-color: var(--color-primary);
}

.team_member-image img{
    filter: saturate(0);
}

.team_member:hover img{
   filter: saturate(1);  
}

.team_member-info *{
    text-align: center;
    margin-top: 1.4rem;
}

.team_member-info p{
    color: var(--color-light);
}

.team_member-socials{
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    right: -100%;
    display: flex;
    flex-direction: column;
    background: var(--color-primary);
    border-radius: 1rem 0 0 1rem;
    box-shadow: -2rem 0 2rem rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.team_member:hover .team_member-socials{
     right: 0;
}

.team_member-socials a{
    padding: 1rem;
}

@media screen and (max-width: 1024px){
    .container{
        width: var(--container-width-md);
    }

    h1{
        font-size: 2.2rem;
    }

    h2{
        font-size: 1.7rem;
    }

    h3{
        font-size: 1.4rem;
    }

    h4{
        font-size: 1.2rem;
    }

    /*nav*/
    nav button{
        display: inline-block;
        background: transparent;
        font-size: 1.8rem;
        color: var(--color-white);
        cursor: pointer;
    }

    nav button#close-menu-btn{
        display: none;
    }

    .nav_menu{
        position: fixed;
        top: 5rem;
        right: 5%;
        height: fit-content;
        width: 18rem;
        flex-direction: column;
        gap: 0;
        display: none;
    }
    .nav_menu li{
        width: 100%;
        height: 5.8rem;
        animation: animateNavItems 400ms linear forwards;
        transform-origin: top right;
        opacity: 0;
    }

    .nav_menu li:nth-child(2){
        animation-delay: 200ms;
    }

    .nav_menu li:nth-child(3){
        animation-delay: 400ms;
    }

    .nav_menu li:nth-child(4){
        animation-delay: 600ms;
    }

    @keyframes animateNavItems {
        0%{
           transform: rotateZ(-90deg);
        }
        100%{
            transform: rotateZ(0); 
            opacity: 1;
        }
    }

    .nav_menu li a{
        background: var(--color-primary);
        box-shadow: -4rem 6rem 10rem rgba(0, 0, 0, 0.6);
        width: 100%;
        height: 100%;
        display: grid;
        place-items: center;
    }

    .nav_menu li a:hover{
        background: var(--color-bg2);
        color: var(--color-white);
    }

    header{
        height: 60vh;
        margin-bottom: 4rem;
    }

    .header_container{
        margin-top: 10rem;
    }

    .categories{
        height: auto;
    }

    .categories_container{
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .categories_left{
        margin-right: 0;
    }

    .courses{
        margin-top: 0;
    }

    .courses_container{
        grid-template-columns: 1fr 1fr;
    }

    .faqs_container{
        grid-template-columns: 1fr;
        
    }

    .faq{
        padding: 1.5rem;
    }

    .footer_container{
        grid-template-columns: 1fr 1fr;
    }

    /*about*/
    .about_achievements{
        margin-top: 2rem;
    }

    .about_achievements_container{
        grid-template-columns: 1fr;
        gap: 4rem;
    }

    .about_achievements-left{
        width: 80%;
        margin: 0 auto;
    }

    .team_container{
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .team_member{
        padding: 1rem;
    }
}

@media screen and (max-width: 600px){
    .container{
        width: var(--container-width-sm);
    }

    .nav_menu{
        right: 3%;
    }

    header{
        height: 100vh;
    }

    .header_container{
        grid-template-columns: 1fr;
        text-align: center;
        margin-top: 0;
    }

    .header_left p{
        margin-bottom: 1.3rem;
    }

    .categories_right{
        grid-template-columns: 1fr 1fr;
        gap: 0.7rem;
    }

    .category{
        
        border-radius: 1rem;
    }

    .category_icon{
        margin-top: 4px;
        display: inline-block;
    }

    .courses_container{
        grid-template-columns: 1fr;
    }

    .testimonial_body{
        padding: 1.2rem;
    }

    .footer_container{
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .footer_1 p{
        margin: 1rem auto;
    }

    .footer_socials{
        justify-content: center;
    }

    /*about*/
    .achievements_cards{
        grid-template-columns: 1fr 1fr;
        gap: 0.7rem;
    }

    .team_container{
        grid-template-columns: 1fr 1fr;
        gap: 0.7rem;
    }

    .team_member{
        padding: 0;
    }

    .team_member p{
        margin-bottom: 1.5rem;
    }
}