:root {
    --black-wash: rgba(0, 0, 0, 0.95);
    --white-wash: rgba(255, 255, 255, 0.95);
    --dark-gray: rgba(255, 255, 255, 0.25);
    --light-gray: rgba(255, 255, 255, 0.75);
    --green: #7df393;
    --light-green: rgba(125, 243, 147, 0.25);
    --lighter-green: rgba(125, 243, 147, 0.03);
    --font-body: 'Helvetica Neue', sans-serif;
    --font-mono: 'Fira Mono', monospace;
    --color-text: var(--white-wash);
    --color-bg: var(--black-wash);

    font-family: var(--font-body);
    color: var(--color-text);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    margin: 0;
    font-weight: 300;
    letter-spacing: 0.3;
}

header {
    top: 0vh;
    left: 0;
    width: 100%;
    height: 6.5vh;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    background-color: var(--color-bg);
    border-bottom: 0.5px solid var(--light-green);
}

header nav {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 80%;
}

.left-nav,
.right-nav {
    display: flex;
    list-style: none;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 0;
    gap: 2.5vw;
}

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

header nav ul li a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 400;
}

header nav ul li a:hover {
    color: rgba(255, 255, 255, 0.85);
}

header img {
    width: 7.5vw;
    height: 5vh;
    padding-right: 1vw;
}

.main {
    padding: 2vh 10vw;
}

h1 {
    font-size: 3.75vw;
    font-weight: 300;
    margin: 0;
}

h2 {
    font-size: 1.75vw;
    font-weight: 300;
    margin: 0;
    color: var(--light-gray);
}

h3 {
    margin: 0;
    font-weight: 400;
    color: var(--green);
    font-size: 0.75vw;
    text-transform: uppercase;
    letter-spacing: 0.1vw;
}

h4 {
    margin: 0;
    font-weight: 400;
    font-size: 2vw;
}

h5 {
    margin: 0;
    font-weight: 400;
    font-size: 3vw;
}

h6 {
    margin: 0;
    font-weight: 400;
    font-size: 1.2vw;
}

h7 {
    margin: 0;
    line-height: 1.4;
    color: var(--light-gray);
    font-size: 1vw;
}

p {
    margin: 0;
    font-size: 0.85vw;
    line-height: 1.5;
    color: var(--light-gray);
}

a {
    margin: 0;
    font-size: 0.85vw;
    text-decoration: underline;
    color: var(--green);
}

button:hover,
a:hover {
    opacity: 0.9;
}

input[type='email'] {
    font-size: 0.8vw;
    background-color: var(--black-wash);
    border: 1px solid var(--light-green);
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
    color: var(--white-wash);
    padding: 1vh 1vw;
    margin: 0;
    width: 100%;
}

input[type='email']:focus {
    border: 1px solid var(--green);
}

input[type='button'],
input[type='submit'] {
    font-size: 0.8vw;
    background-color: var(--green);
    border: 1px solid var(--green);
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
    display: inline-block;
    padding: 1vh 1vw;
    margin: 0;
    cursor: pointer;
}

.primary-button {
    background-color: var(--green);
    color: var(--black-wash);
    font-weight: 500;
    font-size: 0.8vw;
    border-radius: 6px;
    border: none;
    padding: 1vh 1vw;
    cursor: pointer;
    text-decoration: none;
}

.secondary-button {
    background-color: var(--black-wash);
    color: var(--white-wash);
    font-weight: 400;
    font-size: 0.8vw;
    border-radius: 6px;
    border: 1px solid var(--light-green);
    padding: 1vh 1vw;
    cursor: pointer;
    text-decoration: none;
}

.home {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    gap: 2vh;
    padding: 10vh 0;
}

input:focus {
    outline: none;
}

.strong {
    color: var(--white-wash);
    opacity: 1;
    border-bottom: 2px solid var(--light-green);
    font-weight: 400;
}

.green {
    color: var(--green);
}

h2 img {
    width: 1.2vw;
    height: 1.2vw;
}

.input-button {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 1vh;
    padding-top: 2vh;
    width: 45%;
}

#signup,
#about {
    scroll-margin-top: 20rem;
}

.about {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5vh 0;
}

.circle {
    width: 1.2vh;
    height: 1.2vh;
    border-radius: 50%;
    border: 2px solid var(--green);
}

.text-row {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: flex-start;
    width: 100%;
}

.text-column {
    display: flex;
    flex-direction: column;
    padding: 0 3vw 3vw 3vw;
    width: 100%;
    gap: 1vh;
}

.right {
    border-left: 2px solid var(--green);
    text-align: left;
}

.left {
    border-right: 2px solid var(--green);
    text-align: right;
}

.features {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 15vh 5vw;
    text-align: center;
    gap: 2vh;
}

.features-grid {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding-top: 10vh;
}

.feature {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    text-align: left;
    width: 30%;
    gap: 2vh;
}

.feature img {
    width: 2vw;
    height: 2vw;
}

.adaptability {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    padding: 10vh 5vw;
}

.adaptability-column {
    display: flex;
    flex-direction: column;
    width: 45%;
    gap: 1vh;
}

.frameworks {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1vw;
}

.framework {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: 1vh 1vw;
    border: 1px solid var(--light-green);
    border-radius: 6px;
    gap: 0.25vw;
    background-color: var(--lighter-green);
}

.framework p {
    font-weight: 400;
    color: white;
}

.framework img {
    height: 2.5vh;
}

.faqs {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 10vh 5vw;
    gap: 1vh;
}

.toggleboxes {
    display: flex;
    flex-direction: column;
    width: 100%;
    padding: 1vh 0;
}

.togglebox {
    padding: 2vh;
    border: 2px solid var(--light-green);
    border-radius: 6px;
    margin: 1vh 0;
}

input[type='radio'] {
    position: absolute;
    opacity: 0;
}

label {
    position: relative;
    display: block;
    cursor: pointer;
    font-size: 1.2vw;
    font-weight: 400;
    text-align: left;
}

.togglebox p {
    padding-top: 2vh;
}

section {
    height: 0;
    transition: 0.5s all;
    overflow: hidden;
}

#toggle1:checked ~ #content1,
#toggle2:checked ~ #content2,
#toggle3:checked ~ #content3,
#toggle4:checked ~ #content4 {
    height: 12vh;
}

.call-to-action {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 3vh;
    padding: 10vh 5vw;
}

.call-to-action img {
    width: 8vw;
    height: 8vw;
}

footer {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-top: 1px solid var(--light-green);
    padding: 5vh 20vw 5vh 10vw;
    gap: 2.5vh;
}

footer span {
    font-size: 0.8vw;
    opacity: 0.75;
}

.footer-top {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
}

.footer-bottom {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
}

.footer-top span {
    font-size: 1.4vw;
    color: var(--white-wash);
    opacity: 1;
}

.footer-bottom span {
    font-size: 0.8vw;
    color: var(--white-wash);
    opacity: 0.9;
}

.footer-bottom span img {
    width: 1.75vh;
    height: 1.75vh;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 2vh;
}

.website-carbon {
    display: flex;
    flex-direction: row;
}

.website-carbon-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    border-left: 1px solid var(--white-wash);
    padding-left: 1.2vw;
    margin-left: 1.2vw;
    gap: 1vh;
}

.website-carbon-info span {
    font-size: 0.75vw;
    color: var(--white-wash);
    opacity: 0.8;
}

.footer-columns {
    display: flex;
    flex-direction: row;
    gap: 5vw;
}

.footer-column {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    gap: 1.5vh;
}

.footer-column span {
    font-size: 0.8vw;
    font-weight: 400;
    color: var(--white-wash);
    opacity: 1;
    padding-bottom: 0.5vh;
}

.footer-column a {
    font-size: 0.8vw;
    font-weight: 400;
    color: var(--white-wash);
    opacity: 0.6;
    text-decoration: none;
    cursor: pointer;
}

.footer-column a:hover {
    opacity: 0.95;
}

footer h4 {
    font-weight: 300;
}

footer img {
    height: 2.5vw;
    width: 2.5vw;
}

.credits {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    justify-content: flex-end;
    gap: 0.75vw;
}

.turbine {
    display: grid;
    justify-items: center;
    align-items: center;
    grid-template-columns: repeat(1, 1fr); 
    grid-template-rows: repeat(1, 1fr);

    height: 50px;
}

.pole,
.pilot {
    grid-row: 1;
    grid-column: 1;
}

.pole {
    position: relative;
    display: block;
    align-self: end;
    background-color: var(--white-wash);
    height: 13px;
    bottom: 4px;
    width: 1.5px;
    border-radius: 5px 5px 0 0;
    z-index: 0;
}

.pilot {
    position: relative;
    z-index: 1;
}

.pilot:after {
    content: '';
    display: block;

    position: absolute;
    top: 8px;
    z-index: 1;

    height: 2px;
    width: 2px;
    border-radius: 50%;

    box-sizing: border-box;
}

.pilot:after,
.pilot .prop {
    background-color: var(--white-wash);
}

.pilot .prop-container {
    display: grid;
    grid-template-columns: repeat(1, 1fr); /* one row, one column */
    align-items: center;
    justify-items: center;
    animation: propeller 3.5s infinite linear; /*linear stops it from spinning irregularly*/
    transform-origin: 1px 9px; /* the origin of the spin should be bottom side, middle of the overall rectangle*/
}

.pilot .prop {
    height: 7px;
    width: 2px;
    border-radius: 50%;
    grid-column: 1;
    grid-row: 1; /*Stack the propellers on top of each other*/
    transform-origin: 50% 50%; /*Transform the propeller about its centre */
}

/* The the rotateZ rotates the propeller direction, the following transforms rotate around a point of a circle */
.prop:first-child {
    transform: rotate(360deg) translate(0px) rotate(-360deg);
}

.prop:nth-child(2) {
    transform: rotateZ(120deg) rotate(120deg) translate(-9px) rotate(-120deg);
}

.prop:last-child {
    transform: rotateZ(240deg) rotate(240deg) translate(9px) rotate(-240deg);
}

@keyframes propeller {
    to {
        transform: rotateZ(360deg);
    }
}

@media (max-width: 920px) {
    header {
        position: relative;
        /* top: 5vh; */
    }

    header nav {
        width: 90%;
    }

    header nav ul li a {
        display: none;
    }

    header img {
        width: 22vw;
    }

    .main {
        padding: 1vh 3vw;
    }

    .primary-button,
    .secondary-button,
    input[type='button'],
    input[type='submit'],
    input[type='email'] {
        font-size: 1.25vh;
        padding: 1.25vh 1.5vw;
        border-radius: 3px;
    }

    .home {
        gap: 3vh;
        padding: 5vh 3vw;
    }

    h1 {
        font-size: 11vw;
    }

    h2 {
        font-size: 6vw;
    }

    h3 {
        font-size: 2.5vw;
        letter-spacing: 0.1vw;
    }

    h4 {
        font-size: 5vw;
    }

    h5 {
        font-size: 6vw;
    }

    h6 {
        font-size: 4vw;
    }

    h7 {
        font-size: 3.5vw;
    }

    p {
        margin: 0;
        font-size: 3vw;
        line-height: 1.35;
        color: var(--light-gray);
    }

    a {
        font-size: 3.5vw;
    }

    h2 img {
        width: 4.5vw;
        height: 4.5vw;
    }

    .signup-form {
        width: 80%;
    }

    .about {
        padding: 0;
    }

    .circle {
        display: none;
    }

    .text-row {
        flex-direction: column;
        width: 80%;
    }

    .right,
    .left {
        border: none;
        padding: 4vh 0;
    }

    .features {
        padding: 5vh 3vw;
        gap: 2vh;
    }

    .features-grid {
        flex-direction: column;
        gap: 5vh;
        padding: 2vh 0;
    }

    .feature {
        width: 80%;
        gap: 1.5vh;
    }

    .feature img {
        width: 4vw;
        height: 4vw;
    }

    .adaptability {
            flex-direction: column;
            padding: 5vh 5vw;
            gap: 2vh;
    }

    .adaptability-column {
        width: 100%;
        gap: 1vh;
    }

    .frameworks {
        gap: 2vw;
        padding: 1vh 0;
    }

    .framework {
        padding: 1.2vh 2.2vw;
        gap: 1vw;
    }

    .framework img {
        height: 3vh;
    }

    .faqs {
        padding: 5vh 5vw;
        gap: 1vh;
    }

    label {
        font-size: 4vw;
    }

    .togglebox {
        border: 1px solid var(--light-green);
        border-radius: 3px;
    }

    .togglebox p {
        padding-top: 1vh;
    }

    #toggle1:checked ~ #content1,
    #toggle2:checked ~ #content2,
    #toggle3:checked ~ #content3,
    #toggle4:checked ~ #content4 {
        height: 28vh;
    }

    .call-to-action {
        gap: 3vh;
        padding: 5vh 5vw;
    }

    .call-to-action img {
        width: 15vw;
        height: 15vw;
    }

    footer {
        padding: 2vh 5vw;
        gap: 1vh;
    }

    footer span {
        font-size: 3vw;
        opacity: 0.75;
    }

    .footer-top span {
        font-size: 2.75vw;
    }

    .credits {
        display: none;
    }

    .footer-logo {
        gap: 1vh;
    }

    .website-carbon-info {
        padding-left: 2vw;
        margin-left: 2vw;
        gap: 0.5vh;
        border: none;
    }

    .website-carbon-info span {
        display: none;
    }

    .footer-columns {
        gap: 10vw;
    }

    .footer-column {
        gap: 1.5vh;
    }

    .footer-column span {
        font-size: 2.5vw;
        padding-bottom: 0.5vh;
    }

    #navigation {
    display: none;
    }

    .footer-column a {
        font-size: 2.5vw;
    }

    footer img {
        width: 5vw;
        height: 5vw;
    }
}