/* Bellefair, Barlow Condensed, Barlow  */
@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@100;200;300;400;500;600;700;800;900&family=Barlow:wght@100;200;300;400;500;600;700;800;900&family=Bellefair&family=Roboto+Slab:wght@100;200;300;400;500;600;700&family=Roboto:wght@100;300;400;500;700;900&display=swap');

/* -------------------Custom properties------------------- */

:root {
    /* colors */
    --clr-dark: 230 35% 7%;
    --clr-light: 231 77% 90%;
    --clr-white: 0 0% 100%;
    
    /* font-sizes */
    --fs-900: clamp(4.5rem, 7vw + 1rem, 9.375rem);
    --fs-800: clamp(3.5rem, 3vw + 1rem, 5rem);
    --fs-700: clamp(1.5rem, 2vw + 1rem, 1.5rem);
    --fs-600: clamp(1.5rem, 1vw , 1.2rem);
    --fs-500: clamp(1rem, 1vw , 1.35rem);
    --fs-400: clamp (0.75rem, 1vw, 1rem);
    
    /* font-families */
    --ff-serif: "Bellefair", serif;
    --ff-sans-cond: "Barlow Condensed", sans-serif;
    --ff-sans-normal: "Barlow", sans-serif;
}

/*------------------- Reset -------------------*/

/* Box sizing */
*,
*::before,
*::after {
    box-sizing: border-box;
    list-style: none;
}

/* Reset margins */
body,
h1,
h2,
h3,
h4,
h5,
p,
figure,
picture {
    margin: 0; 
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
    font-weight: 400;
}

.title { font-size: var(--fs-900); }
h1 { font-size: var(--fs-800); }
h2 { font-size: var(--fs-700); }
h3 { font-size: var(--fs-600); }

a,
p{ font-size: var(--fs-400); }


/* set up the body */
body {
    font-family: var(--ff-sans-normal);
    color: hsl( var(--clr-white) );
    background-color: hsl( var(--clr-dark) );
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    text-decoration: none;
}

/* make images easier to work with */
img {
    max-width: 100%;
    display: block;
}

/* make form elements easier to work with */
input,
button,
textarea,
select,
ul,
li {
    font: inherit;
}

/* remove animations for people who've turned them off */
@media (prefers-reduced-motion: reduce) {  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/*------------------- Utility classes-------------------     */

/* general */

.flex {
    display: flex;
    gap: var(--gap, 1rem);
}

.grid {
    display: grid;
    gap: var(--gap, 1rem);
}

.sr-only {
  position: absolute; 
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px; 
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap; /* added line */
  border: 0;
}

/* colors */

.bg-dark { background-color: hsl( var(--clr-dark) );}
.bg-accent { background-color: hsl( var(--clr-light) );}
.bg-white { background-color: hsl( var(--clr-white) );}

.text-dark { color: hsl( var(--clr-dark) );}
.text-accent { color: hsl( var(--clr-light) );}
.text-white { color: hsl( var(--clr-white) );}

/* typography */

.ff-serif { font-family: var(--ff-serif); } 
.ff-sans-cond { font-family: var(--ff-sans-cond); } 
.ff-sans-normal { font-family: var(--ff-sans-normal); } 

.letter-spacing-1 { letter-spacing: 4.75px; } 
.letter-spacing-2 { letter-spacing: 2.7px; } 
.letter-spacing-3 { letter-spacing: 2.35px; } 

.uppercase { text-transform: uppercase; }

/*------------------- Components -------------------*/

.underline-indicators > * {
    cursor: pointer;
    padding: var(--underline-gap, 1rem) 0;
    border: 0;
    border-bottom: .2rem solid hsl( var(--clr-white) / 0 );
}

.underline-indicators > *:hover,
.underline-indicators > *:focus {
    border-color: hsl( var(--clr-white) / .5);
}

.underline-indicators > .active,
.underline-indicators > [aria-selected="true"] {
    color: hsl( var(--clr-white) / 1);
    border-color: hsl( var(--clr-white) / 1); 
}

.dot-indicators > * {
    margin: 0;
    width: 1rem;
    cursor: pointer;
    border: 0;
    border-radius: 50%;
    padding: 0;
    background-color: hsl( var(--clr-white) / .25);
    aspect-ratio: 1;
}
 
.dot-indicators > *:hover,
.dot-indicators > *:focus { 
    background-color: hsl( var(--clr-white) / .5);
}

.dot-indicators > .active,
.dot-indicators >[aria-selected="true"] {
    background-color: hsl( var(--clr-white) / 1); 
    color: hsl( var(--clr-dark) / 1);
}

/* =====================FOR LARGE SCREEN SIZES========================  */

.body-home {
    display: block;
    background-image: url('../images/home/background-home-desktop.jpg') ;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
}

.mobile-nav-toggle {
    display: none;
}

.primary-header {
    display: flex;
    justify-content: space-between;
    margin: 0.5rem 0 0 0 ;
    padding: 1rem 0 0 2rem ;
}



.primary-navigation {
    --gap: clamp(1.5rem, 5vw, 3.5rem);
    --underline-gap: 1.3rem;
    list-style: none;
    padding: 0 4rem;
    margin: 0;
    background: hsl( var(--clr-white) / 0.2);
    backdrop-filter: blur(1.5rem);
    font-weight: 500;
}

nav {
    align-items:flex-end;
    order: 2;
}

.logo-isro {
    max-width: 3rem;
    min-width: 2.5rem;
    aspect-ratio: 1;
}

.home-main {
    margin: 0 1%;  
    padding: 4rem 2% 2rem 2% ;
    flex-direction: column;
    text-align: center;
    display: flex;
    justify-content: center;
}

.home-div {
    flex: 4;
}

.home-div-btn {
    flex: 5;
    display: flex;
    justify-content: center;
}

.home-h1  > span {
    letter-spacing: 6px;
    display: block;
}

.home-main p { 
    text-align: justify;
}


.large-button {
    position: relative;
    z-index: 1;
    display: inline-grid;
    place-items: center;
    margin: 6.5rem 0 0 0;
    padding: 2rem;
    max-width: 15rem;
    min-width: 5rem;
    border-radius: 50%;
    aspect-ratio: 1;
    text-decoration: none;
    color: hsl( var(--clr-dark) );
    font-size: clamp(1.5rem, 2vw, 1rem);
    font-weight: bold;
    cursor: pointer;
}

.large-button::after {
    content: '';
    position: absolute;
    z-index: -1;
    width: 100%;
    height: 100%;
    background: hsl( var(--clr-white) / .1);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 500ms linear, transform 750ms ease-in-out;
}
    
.large-button:hover::after,
.large-button:focus::after {
    opacity: 1;
    transform: scale(1.5);
}

/* =====================FOR TABLET SCREEN SIZES========================  */
@media screen and (max-width: 860px) {

    .body-home {
        background-image: url('../images/home/background-home-desktop.jpg');
        background-position:  bottom;
    }

    .primary-header {
        margin: 0 ;
        padding: 1rem 0 0 .75rem ;
    }

    .primary-navigation {
        flex-direction: column;
        --underline-gap: .5rem;
        inset: 0 0 0 30%;
        position: fixed;
        z-index: 1000;
        background-color: hsl( var(--clr-dark) / .9);
        margin: 0;
        padding: 6rem 1rem;
        transform: translateX(100%);
    }
    .primary-navigation[data-visible="true"] {
        transform: translateX(0);
    }
    
    .mobile-nav-toggle {
        display: block;
        position: absolute;
        z-index: 200000;
        top: 1.5rem;
        right: 1rem;
        background:transparent;
        background-image: url('../images/icons/icon-hamburger.svg');
        background-repeat: no-repeat;
        width: 1.8rem;
        aspect-ratio: 1;
        border: 0;
    }
    
    .mobile-nav-toggle[aria-expanded="true"]{
        background-image: url('../images/icons/icon-close.svg');
    }    
}
/* ========================================================================= */
@media (min-width: 860px){

    .primary-header::after {
        content: '';
        display: block;
        position: relative;
        height: 1.5px;
        width: 100%;
        margin-right: -1.5rem;
        margin-top: 2.35rem;
        background: hsl( var(--clr-white) / .25);
        order: 1;
    }


    .home-main {
        flex-direction: row;
        text-align: left;
        padding: 8rem 2rem 2rem 2rem ;
    }

    .logo-isro {
        max-width: 5rem;
    }

    .home-main p {
        max-width: 60ch;
        text-align: inherit;
    }

    .large-button {
        margin: 6.5rem 0 0 0;
        padding: 2.5rem;
        max-width: 18rem;
    }
}