:root {
    --white: #ffffff;
    --black-primary: #121212;
    --dark-primary: #212125;
    --dark-primary-text: var(--dark-primary);
    --dark-secondary: #616165;
    --dark-secondary-text: var(--dark-secondary);
    --dark-tertiary: #c1c1c5;
    --light-secondary-text: #b1b1b5;
    --light-gray: #f5f5f9;
    --gray-bg: #d5d5d9;
    --purple-main: #ac6bff;
    --purple-text: var(--purple-main);
    --orange-main: #ff7038;
    --transition-duration: 100ms;
    --transition-timing: ease-in-out;
    --default-border-radius: 1rem;
}

html {
    font-size: 16px;
}

/* Helpers */

.bold {
    font-weight: 600;
}

.purple-text {
    color: var(--purple-text);
}

.black-bg {
    background-color: var(--black-primary);
}

.dark-gray-bg {
    background-color: var(--dark-primary);
}

.gray-bg {
    background-color: var(--gray-bg);
}

.light-gray-bg {
    background-color: var(--light-gray);
}

.white-bg {
    background-color: var(--white);
}

.purple-bg {
    background-color: var(--purple-main);
}

.orange-bg {
    background-color: var(--orange-main);
}

.margin-top {
    margin-block-start: 2rem;
}

.margin-bottom {
    margin-block-end: 2rem;
}

.flex-center {
    align-self: center;
}

.uppercase {
    text-transform: uppercase;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark-primary-text);
    background-color: var(--dark-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    max-width: 100%;
    overflow-x: hidden;
    -ms-overflow-x: hidden;
}

header, main, .project-header {
    background-color: var(--white);
}

h1, h2, h3 {
    font-size: 3rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0.02em;
    color: var(--dark-primary-text);
    margin: 0;
    padding: 0;
    text-align: left;
}

h2 {
    font-size: 3rem;
}

h3 {
    font-size: 2.5rem;
}

p {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--dark-primary-text);
    margin: 0;
    padding: 0;
    text-align: left;
    & + p {
        margin-block-start: 1rem;
    }
}

li {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--dark-primary-text);
    padding-block: 0.25rem;
}

a {
    text-decoration: none;
    color: var(--dark-primary-text);
    font-weight: 600;
}

a.link-button {
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: flex-start;
    gap: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1;
    background-color: var(--dark-primary);
    color: var(--white);
    text-decoration: none;
    padding-block: 0.5rem;
    padding-inline: 1.5rem 0.5rem;
    border-radius: 5rem;
    letter-spacing: 0.02em;
    min-block-size: 3rem;
    transition: background-color var(--transition-duration) var(--transition-timing), gap var(--transition-duration) var(--transition-timing);
}

a.purple-button {
    background-color: var(--purple-main);
}

a.footer-button {
    background-color: rgba(255, 255, 255, 0.1);
}

.link-button-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    block-size: 2.5rem;
    inline-size: 2.5rem;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
}

a.large-button {
    gap: 1.5rem;
    padding-inline: 2rem 0.5rem;   
}

a.large-button .link-button-arrow {
    block-size: 3rem;
    inline-size: 3rem;
}

a.icon-link-button {
    display: flex;
    align-items: center;
    justify-content: center;
    block-size: 3.5rem;
    inline-size: 3.5rem;
    border-radius: 50%;
    border: 2px solid var(--dark-primary);
    color: var(--dark-primary);
    transition: background-color var(--transition-duration) var(--transition-timing), color var(--transition-duration) var(--transition-timing);
}

a.icon-link-button i {
    font-size: 1.25rem;
}

a.icon-link {
    display: flex;
    align-items: center;
    justify-content: center;
    block-size: 2.5rem;
    inline-size: 2.5rem;
    font-size: 1.5rem;
    color: var(--dark-primary);
    transition: color var(--transition-duration) var(--transition-timing);
}

a.icon-link svg {
    block-size: 1.75rem;
    inline-size: 1.75rem;
}

@media (hover: hover) {
    a:not(.link-button):not(.icon-link-button):not(.icon-link):hover {
        text-decoration: underline;
    }

    a.link-button:hover {
        background-color: var(--dark-primary);
        gap: 2.5rem;
    }

    a.footer-button:hover {
        background-color: rgba(255, 255, 255, 0.2);
        gap: 1rem;
    }

    a.icon-link-button:hover {
        color: var(--white);
        background-color: var(--dark-primary);
    }

    a.icon-link:hover {
        color: var(--purple-text);
        text-decoration: none;
    }
}

/* Navigation */

.navigation {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--white);
    inline-size: 100%;
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.2;
}

.navigation-content {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    inline-size: 100%;
    max-inline-size: 100rem;
    gap: 2rem 4rem;
    padding: 2rem 4rem;
}

.navigation-content-left {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.navigation-content-right {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 0.5rem;
}

.navigation-content-right a {
    color: var(--light-secondary-text);
}

.navigation-name {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1;
    color: var(--light-secondary-text);
}

.navigation-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1;
    color: var(--dark-primary);
    white-space: nowrap;
}

.navigation-linkedin-icon {
    block-size: 1rem;
    inline-size: 1rem;
    color: inherit;
}

.project-type-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1;
    text-transform: uppercase;
    margin-block-end: 1rem;
    background-color: var(--purple-main);
    color: var(--white);
    padding-inline: 0.75rem;
    padding-block: 0.5rem;
    border-radius: 0.5rem;
}

.project-details {
    display: flex;
    flex-direction: column;
    position: relative;
    padding-block: 0.25rem;
    padding-inline-start: 1.5rem;
    gap: 0.25rem;
}

.project-details-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--dark-primary);
    text-transform: uppercase;
}

.project-details-title-large {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--dark-primary);
    text-transform: uppercase;
    padding-block-start: 0.25rem;
}

.project-details-title-large + ul {
    padding-block-start: 0.5rem;
}

.project-details-description {
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.2;
    color: var(--dark-primary);
}

.project-details li {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.2;
    color: var(--dark-primary);
    padding-block: 0.25rem;
}

.project-details ul {
    margin: 0;
    padding-inline-start: 1.5rem;
    & li:last-child {
        padding-block-end: 0;
    }
}

.project-details-line {
    background-color: var(--dark-primary);
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    inline-size: 2px;
}

.project-app-store-links {
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
}

.project-app-store-links img {
    block-size: 3rem;
    inline-size: auto;
}

/* Footer Styles */
.footer {
    background-color: var(--dark-primary);
    padding-block-start: 4rem;
    position: relative;
    color: var(--white);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 4rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: center;
    gap: 4rem;
}

.footer-content-top {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    align-items: center;
    justify-content: flex-start;
    align-self: center;
}

.footer-profile-pic {
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-profile-pic img {
    height: 3rem;
    width: auto;
    border-radius: 50%;
    vertical-align: middle;
}

.footer-content-details {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    align-items: center;
    font-size: 1.125rem;
    color: var(--dark-secondary-text);
}

.footer-name {
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--light-secondary-text);
    line-height: 1;
}

.footer-subtext {
    color: var(--light-secondary-text);
    line-height: 1;
    font-weight: 400;
    font-size: 1.125rem;
}

.footer-bottom-text {
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem 2rem;
    width: 100%;
    color: var(--dark-secondary-text);
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 3rem;
    padding-block: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content-middle {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    align-self: center;
}

.footer-title {
    color: var(--white);
    line-height: 1;
}

.footer-social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.social-link {
    color: var(--white);
    font-size: 1.5rem;
    transition: color 0.2s ease;
}

.social-link:hover {
    color: var(--purple-main);
}

.footer-contact-buttons {
    display: flex;
    gap: 1rem;
}

a.footer-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-inline: 1.5rem 0.5rem;
    min-inline-size: 12rem;
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--purple-main);
    color: var(--white);
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--purple-main);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

@media (max-width: 1024px) {
    .navigation-content {
        padding-inline: 2rem;
    }

    .footer-content {
        padding-inline: 2rem;
    }

}

@media (max-width: 600px) {
    h1, h2 {
        font-size: 2.5rem;
    }

    h3 {
        font-size: 2rem;
    }

    a.large-button {
        gap: 1rem;
        padding-inline: 1.5rem 0.5rem;
    }

    a.large-button .link-button-arrow {
        block-size: 2.5rem;
        inline-size: 2.5rem;
    }

    .navigation-content {
        padding: 2rem 1.5rem;
    }

    .project-app-store-links {
        gap: 1rem;
    }
    
    .project-app-store-links img {
        block-size: 2.5rem;
    }

    .footer {
        padding-block-start: 3rem;
    }

    .footer-content {
        padding-inline: 1.5rem;
        gap: 3rem;
    }

    a.footer-button {
        min-inline-size: unset;
    }

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
    }
}