style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {

    /* colors */
    --clr-dark: hsl(230 35% 7%);
    --clr-light: hsl(231, 76%, 90%);
    --clr-white: hsl(0 0% 100%);
    
    /* font-sizes */
    --fs-900: clamp(6rem, 12vw + 1rem, 8rem);
    --fs-800: 4.5rem;
    --fs-700: 3rem;
    --fs-600: 2rem;
    --fs-500: 1.75rem;
    --fs-400: 1.5rem;
    --fs-300: 1.25rem;
    
    /* font-families */
    --ff-serif: "Bellefair", serif;
    --ff-sans-cond: "Barlow Condensed", sans-serif;
    --ff-sans-normal: "Barlow", sans-serif;
    
    /* font-weights */
    --fw-100: 100;
    --fw-400: 400;

    /* gaps */
    --gap-10: clamp(2rem, 11vw + 1rem, 10rem);
    --gap-5: 5rem;
    --gap-2: 2rem;
    --gap-1: 1rem;
}

body {
    font-family: var(--ff-sans-cond);
    letter-spacing: 0.15rem;
    color: var(--clr-white);
    background-color: var(--clr-dark);
    background-image: url(./assets/home/background-home-tablet.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}

#destin-bcg {
    background-image: url(./assets/destination/background-destination-tablet.jpg);
}

#crew-bcg {
    background-image: url(./assets/crew/background-crew-tablet.jpg);
}

#tech-bcg {
    background-image: url(./assets/technology/background-technology-tablet.jpg);
}

a {
    cursor: pointer;
    text-decoration: none;
}

img {
    display: block;
    max-width: 100%;
}

button {
    cursor: pointer;
    font-family: var(--ff-serif);
}

li {
    list-style-type: none;
}


/* utility classes */

.fw-100 {
    font-weight: var(--fw-100);
}

.fs-500 {
    font-size: var(--fs-500);
}

.fs-600 {
    font-size: var(--fs-600);
}

.fs-800 {
    font-size: var(--fs-800);
}

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

.gap-1 {
    gap: var(--gap-1);
}

.gap-2 {
    gap: var(--gap-2);
}

.justify-space-between {
    justify-content: space-between;
}

.uppercase {
    text-transform: uppercase;
}

.display-flex {
    display: flex;
}

.clr-light {
    color: var(--clr-light);
}

.display-grid {
    display: grid;
    justify-items: center;
    grid-template-rows: 1fr;
}

.align-self-end {
    align-self: flex-end;
}
.no-display {
    display: none;
}

.justify-content-center {
    justify-content: center;
}

.margin-left-auto {
    margin-left: auto;
}

.margin-top-3 {
    margin-top: 3rem;
}

.margin-btm-1 {
    margin-bottom: 1rem;
}

.margin-btm-2 {
    margin-bottom: 2rem;
}

.margin-btm-3 {
    margin-bottom: 3rem;
}

.active {
    border-bottom: 1px solid var(--clr-white);
    padding-bottom: 1.9rem;
}

.lh-100 {
    line-height: 1.25;
}

.mobile-img-width {
    width: 80%;
}

.align-items-center {
    align-items: center;
}

/* header styling */

.underline:hover,
.underline:active {
    border-bottom: 1px solid var(--clr-white);
    padding-bottom: 1.9rem;
}

.underline:link,
.underline:visited {
    color: var(--clr-white);
    margin-right: 1rem;
}

.header {
    margin-top: 0;
    margin-left: 2rem;

}

.blured-nav-bg {
    backdrop-filter: blur(1.5rem);
    padding: 2rem 2rem 2rem 2rem;
    background-color: rgba(255, 255, 255, 0.03);
}

.header-numbers {
    display: none;
}

.hamburger-btn {
    display: none;
    cursor: pointer;
}


/* main part styling */

main {
    text-align: center;
}

.h1-margin-left {
    margin-left: 0;
}

.margin-block-index {
    margin-block: 4rem 2rem;
}

.main-p {
    line-height: 1.75;
    padding-inline: 3rem;
}

.bold {
    font-weight: var(--fw-400);
    font-size: var(--fs-900);
    color: var(--clr-white);
    line-height: 1.5;
}

/* explore button styling */

.explore-btn {
    display: block;
    background-color: var(--clr-white);
    border-radius: 50%;
    color: var(--clr-dark);
    font-size: var(--fs-600);
    padding: 6rem 2.5rem;
    margin-top: 6rem;

}

.explore-btn:hover,
.explore-btn:active {
    box-shadow: 0 0 0 0 var(--clr-light);
	animation: shadow 2s infinite;
}

@keyframes shadow {
	0% {
		box-shadow: 0 0 0 0 var(--clr-light);
	}

	75% {
		box-shadow: 0 0 0 2.5rem rgba(0, 0, 0, 0);
	}

	100% {
		box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
	}
}


/* destination page */

.destination-underline {
    width:95%;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.25);
    margin-block: 2.5rem 1.5rem;
}

.gap-desktop {
    gap: var(--gap-2);
}

.numbers-info {
    flex-direction: column;
}

.numbers-value {
    font-size: var(--fs-500);
}

.destination:hover,
.destination:active,
.active-destination {
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--clr-white);
}


/* crew page */

.option {
    display: block;
    width: 1rem;
    height: 1rem;
    background-color: rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    border-color: transparent;
}

.option:hover,
.option:active,
.active-crew {
    background-color: var(--clr-white);
}

.crew-member-role {
    color: var(--clr-light);
    font-size: var(--fs-300);
}


/* technology page */

.technology-btn {
    border: 1px solid rgba(255, 255, 255, 0.25);
    font-size: var(--fs-400);
    text-align: center;
    display: block;
    width: 3.5rem;
    height: 3.5rem;
    line-height: 3.5rem;
    border-radius: 50%;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--clr-white);
}

.technology-btn:hover,
.technology-btn:active,
.active-tech {
    background-color: var(--clr-white);
    color: black;
    border-radius: 50%;
}

.active-tech .technology-btn{
    background-color: var(--clr-white);
    color: black;
}

.technology-btn-part {
    flex-direction: row;
}

.display-flex-tech {
    gap: 0;
    flex-direction: column;
}

.terminology-p {
    margin-top: 2rem;
    font-size: var(--fs-300);
}

.numbers-heading {
    margin-bottom: 0.5rem;
}


/* desktop design */

@media only screen and (min-width: 769px) {
    body {
        background-image: url(./assets/home/background-home-desktop.jpg);
        background-attachment: fixed;
    }

    #destin-bcg {
        background-image: url(./assets/destination/background-destination-desktop.jpg);
    }
    
    #crew-bcg {
        background-image: url(./assets/crew/background-crew-desktop.jpg);
    }
    
    #tech-bcg {
        background-image: url(./assets/technology/background-technology-desktop.jpg);
    }

    main {
        text-align: start;
    }

    .main-p {
        padding-inline: 0;
    }

    /* utility classes */

    .display-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: 1fr;
        margin-inline: auto;
        padding-inline: 1.5rem;
        max-width: 85vw;
        justify-content: center;
        gap: var(--gap-2);
    }

    .justify-content-center {
        justify-content: flex-start;
    }
    
    .fs-600 {
        font-size: var(--fs-700);
    }

    .grid-reverse {
        grid-row: 1 / span 1;
    }

    .text-width {
        max-width: 85%;
    }

    .margin-top-4 {
        margin-top: 4rem;
    }

    .mobile-img-width {
        width: 100%;
    }
    .margin-block-index {
        margin-block: 3rem 0;
    }


    /* header */

    .header {
        margin-top: 2rem;
    }

    .h1-margin-left {
        margin-left: clamp(2rem, 8vw + 1rem ,7.5rem);
    }

    .header-numbers {
        display: inline;
    }

    header::after {
        content: "";
        display: block;
        position: relative;
        width: 50%;
        height: 1px;
        background-color: rgba(255, 255, 255, 0.25);
        order: 1;
        margin-right: -4rem;
    }

    .navigation {
        order: 2;
        width: 100%;
    }

    .blured-nav-bg {
        padding: 2rem 2rem 2rem 6rem;
    }


    /* home page */

    .explore-btn {
        margin-top: 12rem;
    }

    .gap-desktop {
        gap: var(--gap-10);
    }
    

    /* destination page */
    
    .description.text-width {
        max-width: 90%;
    }

    .numbers-info {
        gap: clamp(1rem, 4vw + 1rem, var(--gap-5));
        flex-direction: row;
    }

    .numbers-value {
        font-size: clamp(1rem, 2.5vw, var(--fs-500));
    }

    /* crew page */
    
    .crew-member-role {
        font-size: var(--fs-500);
    }

    .display-grid-members {
        display: grid;
        grid-template-rows: 25rem 2rem;
    }

    .members-btn {
        grid-row: 2 / span 1;
    }


    /* technology page */

    .terminology-p {
        margin-top: 0;
        font-size: initial;
    }

    .display-flex-tech {
        gap: var(--gap-2);
        flex-direction: row;
    }

    .technology-btn-part {
        flex-direction: column;
        align-self: center;
    }

    .tech.display-grid {
        max-width: 91%;
        padding-inline: 0rem;
        justify-content: end;
        margin-inline: 0;
        margin-left: auto;
        align-items: center;
    }

    .tech .img-part {
        justify-self: end;
    }
}

@media only screen and (max-width: 576px) { 
     
    /* mobile navigation styling */ 
    .blured-nav-bg {
        display: none;
        position: fixed;
        background-color: rgba(255, 255, 255, 0.03);
        padding: 6rem 5rem 2rem 5rem;
        margin: 0;
        inset: 0 0 0 30%;
    }

    .header {
        margin-top: 2rem;
    }

    .flex-clmn {
        flex-direction: column;
    }

    .underline:hover,
    .underline:active {
    padding-bottom: 0.75rem;
    }

    .active {
        padding-bottom: 0.75rem;
    }

    .hamburger-btn {
        display: block;
        margin-right: 2rem;
        z-index: 1000;
    }

    .display {
        display: block;
    }

    .overflow-hidden {
        overflow: hidden;
    }

    .member-photo {
        border-bottom: 1px solid rgba(255, 255, 255, 0.25);
    }
}