:root{
    --fm-p: "IBM Plex Sans Arabic", sans-serif;
    --fm-h1: "Anton", sans-serif;

    --fw-100: 100;
    --fw-200: 200;
    --fw-300: 300;
    --fw-400: 400;
    --fw-500: 500;
    --fw-600: 600;
    --fw-700: 700;
    --fw-800: 800;
    --fw-900: 900;

    --fs: 1em;

    --gap: 1rem;

    --clr-accent: hsl(357, 84%, 51%);
    --clr-neutral-100: 0, 0%, 100%;
    --clr-neutral-300: 0, 0%, 90%;
    --clr-neutral-400: 0, 0%, 64%;
    --clr-neutral-800: 0, 0%, 23%;
    --clr-neutral-900: 0, 0%, 0%;

    --flex-dir: row;

    --width: 80%;

    --input-width: calc(25% - calc(var(--gap) * 1.5));

}

*, h1, h2, h3, h4, p, a, li, span{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*:focus{
    outline: none;
    border: solid 1px var(--clr-accent);
}

body{
    max-width: 100vw;
    max-height: 100vh;
    background-color: var(--clr-neutral-300);
    font-family: var(--fm-p);
    font-size: var(--fs);
    overflow-x: hidden;
}

#myVideo{
    position: absolute;
    top: 0;
    left: 0;
    z-index: -2;
    min-width: 100%;
    min-height: 100%;
}

.overlay{
    position: absolute;
    width: 100%;
    height: 100%;
    inset: 0;
    background: hsl(var(--clr-neutral-800), .75);
    background: linear-gradient(180deg,hsl(var(--clr-neutral-800), .9) 25%, hsl(var(--clr-neutral-800), 0) 100%);
    z-index: -1;
}

h1{
    --factor: 4;

    font-family: var(--fm-h1);
    font-size: calc(var(--fs) * var(--factor)); 
    color: hsl(var(--clr-neutral-100));
}

h3{
    font-family: var(--fm-p);
    font-weight: var(--fw-600);
    font-size: calc(var(--fs) * 1.2);
    color: var(--clr-accent);
}

p{
    font-family: var(--fm-p);
    font-size: var(--fs);
    color: hsl(var(--clr-neutral-100));
}

.subheading{
    font-family: var(--fm-p);
    font-size: calc(var(--fs) * 1.5);
    text-transform: uppercase;
    font-weight: var(--fw-200);
    max-width: 60ch;
    color: hsl(var(--clr-neutral-100));
}

span{
    font-family: var(--fm-p);
    font-size: calc(var(--fs) * .87);
    color: hsl(var(--clr-neutral-400));
}

a{
    color: hsl(var(--clr-neutral-100));
}

label{
    --factor: .8;

    font-family: var(--fm-p);
    font-weight: var(--fw-300);
    font-size: calc(var(--fs) * var(--factor));
    color: hsl(var(--clr-neutral-100));
    margin: calc(var(--gap) * .6) 0 calc(var(--gap) * .25) var(--gap);
}

input{
    --opacity: 25%;

    border: solid .5px hsl(var(--clr-neutral-400));
    padding: calc(var(--gap) * 1) calc(var(--gap) * 1.5);
    color: hsl(var(--clr-neutral-100));
    border-radius: calc(var(--gap) * 0.75);
    background-color: hsl(var(--clr-neutral-100), var(--opacity));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

input[type="number"] {
    -webkit-appearance: textfield;
       -moz-appearance: textfield;
            appearance: textfield;
  }
  input[type=number]::-webkit-inner-spin-button, 
  input[type=number]::-webkit-outer-spin-button { 
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

input:focus{
    border: solid 1px var(--clr-accent);
    outline: none;
}

select{
    --opacity: 25%;

    border: solid .5px hsl(var(--clr-neutral-400));
    background-color: hsl(var(--clr-neutral-100), var(--opacity));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: calc(var(--gap) * 1) calc(var(--gap) * 1.5);
    border-radius: calc(var(--gap) * 0.75);
    margin-top: calc(var(--gap) * 2.5);
    width: calc(var(--input-width) * 2);

    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg fill='black' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
    background-repeat: no-repeat;
    background-position-x: 95%;
    background-position-y: 50%;
}

select:focus{
    outline: none;
    border: solid 1px var(--clr-accent);
}

ul{
    list-style: none;
    display: flex;
    flex-direction: var(--flex-dir);
    align-items: center;
    gap: var(--gap);
}

button{
    --max-width: 30%;

    background-color: hsl(var(--clr-neutral-100), 0);
    padding: calc(var(--gap) * 1) calc(var(--gap) * 1.5);
    border: solid 1.5px hsl(var(--clr-neutral-100));
    border-radius: calc(var(--gap) * 1.2);
    margin-top: calc(var(--gap) * 2);
    color: hsl(var(--clr-neutral-100));
    font-family: var(--fm-h1);
    font-size: calc(var(--fs) * 1.2);
    align-self: center !important;
    justify-self: center;
    max-width: var(--max-width);
    cursor: pointer;
    transition: all 350ms ease-out;
    text-transform: uppercase;
    grid-column: 1/-1;
}

button:hover{
    background-color: var(--clr-accent);
    color: var(--clr-neutral-100);
    border: solid 3px var(--clr-accent);
    border-radius: 0;
}

button:focus{
    outline: none;
    border: solid 1px var(--clr-accent);
}

header{
    width: 100vw;
    top: 0;
    
}

.header-wrap{
    --border-bottom: solid 1px hsl(var(--clr-neutral-100));

    width: var(--width);
    display: flex;
    justify-content: space-between;
    padding: calc(var(--gap) * 1.5) 0;
    margin-inline: auto;
    border-bottom: var(--border-bottom);
}

header img{
    --factor: 10;

    width: calc(var(--gap) * var(--factor));
}

ul img{
    width: calc(var(--gap) * 2);
    filter: brightness(0) invert(1);
    background-color: hsl(var(--clr-neutral-100), 0);
    background-size: 0;
    padding: calc(var(--gap) * 0.25);
    border-radius: calc(var(--gap) * 0.25);

    transition: all 250ms ease-in;
}

ul img:hover{
    filter: sepia(0%);
    background-color: hsl(var(--clr-neutral-100), 100%);
    background-size: 1;
}

ul li a{
    color: hsl(var(--clr-neutral-100));
}

main{
    width: 100%;
    margin-inline: auto;
}

.wrap{
    width: calc(var(--width) - 10%);
    margin-inline: auto;
}

.hero{
    --factor: 3;

    display: grid;
    place-content: center;
    gap: calc(var(--gap) * calc(var(--factor) / var(--factor)));
    text-align: center;
    padding: calc(var(--gap) * var(--factor));
    
}

.form{
    --factor: 4;
    --factor-inline: 4;
    --factor-block: 8;
    --opacity: 10%;

    width: 100%;
    background-color: hsl(var(--clr-neutral-900), var(--opacity));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(7px);
    border: 2px solid hsl(var(--clr-neutral-800), .25);
    border-radius: calc(var(--gap) * var(--factor)) calc(var(--gap) * var(--factor)) 0 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    
    gap: var(--gap);
    padding: calc(var(--gap) * var(--factor-block)) calc(var(--gap) * var(--factor-inline)) calc(var(--gap) * var(--factor-block)) calc(var(--gap) * var(--factor-inline));
}

.sides{
    display: flex;
    flex-direction: var(--flex-dir);
    flex-wrap: wrap;
    gap: var(--gap);
}

.side{
    --flex-dir: column;

    display: flex;
    flex-direction: var(--flex-dir);
    margin-top: calc(var(--gap) * .5);
    width: var(--input-width);
}

footer{
    --factor: 2;
    --width: 80%;

    position: sticky;
    bottom: 0;
    width: 100%;
    background-color: hsl(var(--clr-neutral-900));
    border-radius: calc(var(--gap) * var(--factor)) calc(var(--gap) * var(--factor)) 0 0;
}

footer .header-wrap{
    --factor: 1.5;
    --border-bottom: 0;

    padding: calc(var(--gap) * var(--factor));
    margin-inline: auto;
    align-items: center;
    justify-content: center;
}

.copyrights p{
    --factor: .75;

    color: hsl(var(--clr-neutral-100));
    font-size: calc(var(--fs) * var(--factor));
}

.copyrights{
    text-align: center;
}

.cridits{
    --factor: 10;
    --flex-dir: column;

    position: fixed;
    right: 0;
    top: 50%;
    background: hsl(var(--clr-neutral-100));
    width: calc(var(--gap) * var(--factor));
    padding: calc(var(--gap) * calc(var(--factor) * .1)) calc(var(--gap) * calc(var(--factor) * .2));
    border-radius: calc(var(--gap) * calc(var(--factor) * .15)) 0 0 calc(var(--gap) * calc(var(--factor) * .15));

    z-index: 1000;
}

.title{
    --factor: 1;

    width: 100%;
    margin-bottom: calc(var(--gap) * var(--factor));
    border-bottom: solid .5px hsl(var(--clr-neutral-900));
}

.title p{
    color: hsl(var(--clr-neutral-900));
}
.popup{
    display: none;
}

.popup:popover-open{
    width: calc(var(--width) * .6);
    margin-inline: auto;
    margin-block: auto;
    border: 0;
    border-radius: calc(var(--gap) * 2.5);
    padding: calc(var(--gap) * 7) calc(var(--gap) * 2);
    display: grid;
    place-items: center;
    z-index: 99;
}

.popup:popover-open::backdrop{
    position: absolute;
    inset: 0;

    background-color: hsl(var(--clr-neutral-900), .5);;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
}

.popup img{
    width: 35%;
    margin-bottom: calc(var(--gap) * 3);
}

.popup .area{
    margin-inline: auto;
}

.popup .sides{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr));
}

.popup .side:nth-child(1), .popup .side:nth-child(2){
    grid-column: 1/-1;
}

.popup .side{
    width: 100%;
}

.popu h3{
    color: var(--clr-accent);
}

.popup p{
    color: hsl(var(--clr-neutral-900));
}

.popup label{
    color: hsl(var(--clr-neutral-800), .75);
}

.solid{
    background-color: var(--clr-accent);
}

/* Tablet styles */
@media (width <= 768px) {
    :root {
        --fs: .9em;
        --gap: .8rem;
        --width: 85%;
        --input-width: calc(50% - calc(var(--gap) * 0.5));
    }

    h1 {
        --factor: 3.8;
        text-align: center;
    }

    .subheading {
        text-align: center;
        font-size: calc(var(--fs) * 1.3);
    }

    .hero {
        text-align: center;
        margin-bottom: calc(var(--gap) * 3);
    }

    .form {
        grid-template-columns: 1fr;
        gap: calc(var(--gap) * 3);
    }

    .sides {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--gap);
    }

    select {
        width: 100%;
    }

    .popup:popover-open {
        width: calc(var(--width) * 0.9);
        padding: calc(var(--gap) * 4) calc(var(--gap) * 1.5);
    }

    .popup .sides {
        grid-template-columns: 1fr 1fr;
    }
}

/* Mobile styles */
@media (width <= 480px) {
    :root{
        --fs: .8em;
        --gap: .7rem;
        --flex-dir: column;
        --width: 95%;
        --input-width: 100%;
    }

    body{
        overflow-x: hidden;
    }

    #myVideo {
        /* Hide video on very small screens for performance */
        display: none;
    }

    .overlay {
        background: hsl(var(--clr-neutral-800), .9);
    }

    h1{
        --factor: 2.8;
        text-align: center;
        line-height: 1.1;
    }

    .subheading {
        font-size: calc(var(--fs) * 1.1);
        text-align: center;
        max-width: 100%;
    }

    label{
        --factor: .95;
        margin: calc(var(--gap) * .4) 0 calc(var(--gap) * .2) 0;
    }

    input, select {
        padding: calc(var(--gap) * 0.8) calc(var(--gap) * 1);
        font-size: calc(var(--fs) * 0.9);
    }

    button{
        --max-width: 100%;
        padding: calc(var(--gap) * 1.2) calc(var(--gap) * 1.5);
        font-size: calc(var(--fs) * 1.1);
        margin-top: calc(var(--gap) * 2);
    }

    .header-wrap {
        --factor-inline: 1;
        --factor-block: 1;
        padding: calc(var(--gap) * 1) calc(var(--gap) * 1.5);
    }

    header .contact{
        display: none;
    }

    header img{
        --factor: 12;
        max-width: 150px;
    }

    .header-wrap{
        justify-content: center;
        align-items: center;
    }

    .hero {
        text-align: center;
        margin-bottom: calc(var(--gap) * 2);
    }

    .form{
        grid-template-columns: 1fr;
        gap: calc(var(--gap) * 3);
    }

    .sides {
        display: flex;
        flex-direction: column;
        gap: calc(var(--gap) * 0.5);
    }
    
    select{
        width: 100%;
        margin-top: calc(var(--gap) * 1.5);
    }

    .area {
        margin-bottom: calc(var(--gap) * 2);
    }

    .area h3 {
        margin-bottom: calc(var(--gap) * 1);
    }

    .popup:popover-open{
        width: calc(var(--width) * 1);
        padding: calc(var(--gap) * 3) calc(var(--gap) * 1.5);
        margin: calc(var(--gap) * 2);
    }

    .popup img{
        width: 60%;
        margin-bottom: calc(var(--gap) * 2);
    }

    .popup .sides {
        display: flex;
        flex-direction: column;
        gap: calc(var(--gap) * 0.5);
    }

    .popup .side:nth-child(1), .popup .side:nth-child(2){
        grid-column: unset;
    }

    .cridits {
        --factor: 8;
        padding: calc(var(--gap) * calc(var(--factor) * .08)) calc(var(--gap) * calc(var(--factor) * .15));
    }

    .cridits img {
        max-width: 100%;
        height: auto;
    }

    footer {
        position: relative;
        margin-top: calc(var(--gap) * 4);
    }

    footer .header-wrap {
        padding: calc(var(--gap) * 1.5);
    }

    .copyrights p {
        --factor: .7;
        line-height: 1.4;
    }
}

/* Large mobile landscape */
@media (width <= 640px) and (orientation: landscape) {
    h1 {
        --factor: 2.5;
    }

    .hero {
        margin-bottom: calc(var(--gap) * 1.5);
    }

    .form {
        gap: calc(var(--gap) * 2);
    }

    .sides {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--gap);
    }
}

/* Extra small devices */
@media (width <= 320px) {
    :root {
        --fs: .75em;
        --gap: .6rem;
    }

    h1 {
        --factor: 2.5;
    }

    .header-wrap {
        padding: calc(var(--gap) * 0.8) calc(var(--gap) * 1);
    }

    .popup:popover-open {
        margin: calc(var(--gap) * 1);
        padding: calc(var(--gap) * 2) calc(var(--gap) * 1);
    }
}