:root {
    --saltire-blue: #2e70a9;
    --saltire-blue-dark: #275e8e;
    --turquoise: #90c9c9;
    --grey-outline: #646464;
    --menu-highlight: RGB(255, 255, 255, 0.2);
    --text-light: #F2F0EF;
    --text-dark: #171717;
    --padding-sides: 11%;
    --header-height: 70px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-padding-top: var(--header-height);
    /* height of sticky header, because the header hides the content when jumping to anchors */
}

body {
    margin: 0;
}

section {
    padding: 6% var(--padding-sides);
}

@media(max-width: 767px) {
    section {
        padding: var(--padding-sides);
    }
}

h1 {
    font-family: "Faustina", serif;
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
    font-size: 78px;
    letter-spacing: 0.05em;
    color: var(--saltire-blue);
    text-transform: uppercase;
}

@media(max-width: 767px) {
    h1 {
        font-size: 64px;
    }
}

h2,
h3,
h4,
h5,
h6,
p,
span,
a,
li,
label,
button,
td,
caption,
input,
textarea {
    font-family: "Roboto", sans-serif;
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
    font-variation-settings: "wdth" 100;
}

h2 {
    font-size: 24px;
    text-transform: uppercase;
    margin: 0 0 50px 0;
}

h3 {
    font-size: 18px;
    font-weight: 700;
}

p,
li {
    font-size: 16px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
}

button.button-dark {
    color: var(--text-light);
    background-color: var(--saltire-blue);
}

button.button-light {
    color: var(--saltire-blue);
    background-color: var(--text-light);
}

button.button-light:hover {
    background-color: var(--saltire-blue);
    color: var(--text-light);
}

button.button-dark:hover {
    background-color: var(--saltire-blue-dark);
}

header {
    position: sticky;
    top: 0;
    z-index: 1;
    height: var(--header-height);
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 20%;
    background-color: var(--saltire-blue);
    text-transform: uppercase;
    padding: 10px var(--padding-sides);
}

@media (max-width: 767px) {
    header {
        background-color: white;
        padding: 10px;
    }
}

header img {
    height: 100%;
    object-fit: contain;
}

/* header logo only for mobile */
@media (min-width: 768px) {
    header img {
        display: none;
    }
}

header a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 18px;
}

header .header-contact {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    color: var(--text-light);
}

@media (max-width: 767px) {

    header a,
    header .header-contact {
        color: var(--text-dark);
    }
}

header .header-contact p {
    margin: 0;
    font-weight: 800;
}

header .header-contact a {
    font-weight: 800;
    font-size: 22px;
}

#nav-menu {
    display: flex;
    gap: 6%;
    align-items: center;
}

#nav-menu a {
    white-space: nowrap;
}

#nav-menu a:hover {
    color: #dbd9d7;
}

#nav-menu a.nav-selected {
    font-weight: 600;
    border-radius: 4px;
    background-color: var(--menu-highlight);
    padding: 4px 9px;
}

#mobile-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    right: 0;
    padding: 20px;
    flex-direction: column;
    gap: 10px;
    background-color: var(--saltire-blue);
}

#mobile-menu a {
    color: var(--text-light);
    padding: 8px 4px;
}

#mobile-menu a.nav-selected {
    background-color: var(--menu-highlight);
}

#hamburger {
    display: none;
    color: var(--saltire-blue);
}

@media(max-width: 767px) {
    #nav-menu {
        display: none;
    }

    #hamburger {
        display: block;
    }
}

#banner {
    background-image: url(images/shutterstock-boiler.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    height: 85vh;
    padding: 3% var(--padding-sides);
}

#banner .banner-content-container {
    text-align: center;
    color: var(--text-light);
}

@media(max-width: 767px) {
    #banner .banner-content-container {
        color: var(--text-dark);
    }
}

@media(min-width: 768px) {
    #banner .banner-content-container {
        padding-left: 55%;
    }
}

#banner h1 {
    margin: 0 0 8px 0;
}

#banner h2 {
    width: fit-content;
    margin: auto;
    padding: 6px 16px;
    background-color: var(--saltire-blue);
    letter-spacing: 0.1em;
}

#banner h3 {
    margin: 20px 0;
}

@media (max-width: 767px) {
    #banner h1 {
        margin-top: 60px;
    }

    #banner h2 {
        font-size: 20px;
        color: var(--text-light);
    }

    #banner h3 {
        margin: 40px 0 20px 0;
    }
}

#banner ul {
    text-align: left;
    width: fit-content;
    margin: auto;
}

#banner ul .fa-check-circle {
    color: var(--saltire-blue);
}

#banner li {
    font-weight: 700;
    line-height: 1.5em;
}

#banner .logo {
    width: 40%;
    /* removes default space under image */
    vertical-align: top;
}

@media(max-width: 767px) {
    #banner .logo {
        display: none;
    }
}

#banner button {
    margin-top: 30px;
}

@media(max-width: 767px) {
    #banner button {
        background-color: var(--saltire-blue);
        color: var(--text-light);
    }
}

#services {
    text-align: center;
    color: var(--text-dark);
}

#services h2 {
    margin: 0;
}

#services .services-cards-container {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: space-around;
    margin-top: 60px;
}

#services .services-card {
    background: linear-gradient(to bottom, #8abfbf, var(--saltire-blue));
    color: var(--text-light);
    border-radius: 12px;
    padding: 30px;
    width: 300px;
}

#services .service-icon-container {
    width: 70px;
    height: 70px;
    margin: auto;
    border: 3px solid var(--text-light);
    border-radius: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#services .services-card h3 {
    margin: 15px 0 30px 0;
}

#services .services-card p {
    margin: 5px 0;
}

#about {
    background-image: url(images/bathroom_with_bathtub_4yb2c64vonb3pvgim9prn3.webp);
    background-repeat: no-repeat;
    background-size: cover;
}

#about .about-content-container {
    text-align: center;
    color: var(--text-dark);
    background-color: white;
    padding: 60px;
    width: 60%;
    margin: auto;
}

#about p {
    text-align: justify;
}

@media(max-width: 767px) {
    #about .about-content-container {
        width: 100%;
    }

    #about p {
        text-align: center;
    }
}

#about h3 {
    margin: 0;
    font-weight: 500;
}

#about h3:first-of-type {
    margin: 50px 0 5px 0;
}

#contact {
    background-color: var(--turquoise);
}

#contact .contact-content-container {
    color: var(--text-dark);
    background-color: white;
    padding: 60px;
    width: 60%;
    margin: auto;
    border-radius: 20px;
}

@media(max-width: 767px) {
    #contact .contact-content-container {
        width: 100%;
    }
}

#contact h2 {
    text-align: center;
}

#contact .contact-grid {
    display: grid;
    grid-template-columns: 3fr 5fr;
    grid-template-rows: auto;
    gap: 5%;
}

@media(max-width: 767px) {
    #contact .contact-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto;
    }
}

#contact table {
    border-collapse: collapse;
    width: 100%;
}

#contact table:first-of-type {
    margin-bottom: 40px;
}

#contact table caption {
    text-align: left;
    font-size: 18px;
    text-transform: uppercase;
    margin-bottom: 15px;
}

#contact td {
    padding-bottom: 6px;
}

/* set width of first column of tables */
#contact td:first-child {
    width: 100px;
}

#contact a {
    color: var(--text-dark);
    text-decoration: none;
}

#contact form {
    display: flex;
    flex-direction: column;
    width: 100%;
}

#contact form input[type="text"],
#contact form input[type="email"],
#contact form input[type="phone"] {
    width: 100%;
    margin: 4px 0 12px 0;
    border: 1px solid rgb(100, 100, 100);
    border-radius: 2px;
    padding: 5px;
    font-size: 16px;
}

#contact form textarea {
    width: 100%;
    margin-top: 4px;
    border: 1px solid var(--grey-outline);
    border-radius: 2px;
    padding: 5px;
    font-size: 16px;
}

#contact form input[type="text"]:focus,
#contact form input[type="email"]:focus,
#contact form input[type="phone"]:focus,
#contact form textarea:focus {
    border: 1px solid var(--saltire-blue);
    outline: 2px solid var(--saltire-blue);
}

#contact form input[type="submit"] {
    width: fit-content;
    padding: 10px 20px;
    margin-top: 15px;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-light);
    background-color: var(--saltire-blue);
    align-self: flex-end;
}

@media(max-width: 767px) {
    #contact form input[type="submit"] {
        align-self: center;
    }
}

#contact form input[type="submit"]:hover {
    background-color: var(--saltire-blue-dark);
}

#contact form label:has(+ input:required)::after,
#contact form label:has(+ textarea:required)::after {
    content: " *";
    color: var(--text-dark);
}

#brands {
    text-align: center;
    color: var(--text-dark);
}

#brands .brands-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    row-gap: 20px;
    column-gap: 90px;
    justify-items: center;
    align-items: center;
    width: 60%;
    margin: 80px auto 0 auto;
}

#brands a {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#brands a img {
    max-width: 100%;
    max-height: 55%;
    object-fit: contain;
}

@media(max-width: 767px) {
    #brands .brands-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: 1fr 1fr 1fr;
        row-gap: 10px;
        column-gap: 60px;
        width: 100%;
        margin: auto;
    }
}

#to-top {
    /* hidden by default, shown when user scrolls down from top of document */
    display: none;
    width: 50px;
    height: 50px;
    position: fixed;
    bottom: 40px;
    right: 40px;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    background-color: var(--saltire-blue);
    border-radius: 30px;
}

@media(max-width: 767px) {
    #to-top {
        bottom: 25px;
        right: 25px;
    }
}

#to-top:hover {
    background-color: var(--saltire-blue-dark);
}

footer {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto;
    padding: 24px var(--padding-sides);
    background-color: #374948;
    color: var(--text-light);
    text-align: center;
    font-size: 16px;
}

footer .footer-icons {
    text-align: left;
    margin-top: 12px;
}

footer .footer-icons i {
    display: block;
    margin-bottom: 16px;
}

footer .footer-icons a {
    color: var(--text-light);
    text-decoration: none;
    margin-left: 10px;
}

footer .footer-icons a:hover {
    color: var(--menu-highlight);
}

footer .logo {
    width: 20%;
}

footer .service-area {
    margin-top: 10px;
}

footer .copyright {
    font-style: italic;
    font-size: 14px;
}

footer .payment-options {
    text-align: right;
    padding-top: 5px;
}

footer .payment-options img {
    width: 50%;
}

footer img {
    object-fit: contain;
}

@media(max-width: 767px) {
    footer {
        grid-template-columns: auto;
        grid-template-rows: auto auto auto;
    }

    footer .footer-icons {
        text-align: center;
    }

    footer .payment-options {
        text-align: center;
    }
}