* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-margin: var(--navbar-height);
}

:root {
    --navbar-height: 3.5rem;
    --background-color: #a4dcd5;
    --primary-color: #02c4d2;
    --dark-color: #363543;

    --default-font-size: 1rem;
    --small-font-size: 0.8rem;
    --tiny-font-size: 0.7rem;
    --smallest-font-size: 0.6rem;

    scrollbar-width: thin;
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Sans Tamil", sans-serif;
    color: white;
    overflow: hidden auto;
}

a,
button {
    cursor: pointer;
}

.hidden-left {
    translate: -100% 0;
    opacity: 0;
    transition: translate 1s, opacity 1s;
}
.hidden-right {
    translate: 100% 0;
    opacity: 0;
    transition: translate 1s, opacity 1s;
}
.hidden-invisible {
    opacity: 0;
    transition: opacity 1s;
}
.show {
    opacity: 1;
    translate: 0 0;
}

#background {
    position: fixed;
    left: 0;
    top: 0;
    width: 100dvw;
    height: 100dvh;
    background: var(--dark-color);
    z-index: -1;
}

main {
    overflow-x: hidden;
}

main > section {
    min-height: calc(100dvh - var(--navbar-height));
    margin-bottom: 10rem;
    position: relative;
    font-size: var(--default-font-size);
}

main > section h1 {
    font-size: 2.5em;
}

main > section h2 {
    font-size: 2em;
}

main > section p {
    font-size: 1.5em;
}

main a {
    color: lightgray;
}

main a.dark-link {
    color: gray;
}

footer {
    padding: 2rem 1.5rem;
}

.rotate-on-hover {
    transition: 0.2s;
    display: inline-block;
}
.rotate-on-hover:hover {
    rotate: 20deg;
}

.actions-button-list {
    display: flex;
    gap: 1rem;
    margin-top: 1em;
    font-size: var(--default-font-size);
}

.primary-button,
.secondary-button {
    color: black;
    font-weight: 600;
    padding: 0.5em 0.7em;
    border-radius: 0.5em;
    border: 0.2rem solid var(--primary-color);
    background-color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5em;
    transition: 0.2s;
    width: fit-content;
}
.primary-button:hover,
.secondary-button:hover {
    opacity: 0.6;
}
.primary-button > img,
.secondary-button > img {
    transition: 0.2s;
}
.primary-button:hover > img,
.secondary-button:hover > img {
    translate: 0.5em 0;
}
.secondary-button {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background-color: transparent;
}

#up-button {
    background-color: var(--dark-color);
    opacity: 0;
    pointer-events: none;
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    width: 2rem;
    height: 2rem;
    background-image: url(../icons/arrow-up.svg);
    background-repeat: no-repeat;
    background-size: 1.2rem;
    background-position: center;
    outline: 0.15rem solid white;
    border-radius: 50%;
    padding: 1.5rem;
    z-index: 2;
    transition: 0.5s;
}
#up-button.scrolling {
    opacity: 1;
    pointer-events: auto;
}
#up-button:hover {
    background-position: 50% calc(50% - 0.2rem);
    opacity: 0.6;
}
#up-button:active {
    scale: 0.9;
}

@media (max-width: 550px) {
    main > section {
        margin-bottom: 2rem;
    }
}

@media (max-width: 400px) {
    .primary-button, .secondary-button {
        font-size: var(--small-font-size);
    }
}