:root {
    --dark-maroon: #800000;
    --white: #fff;
    --light-grey: #f0f0f0;
    --dark-blue: #00008b;
    --black: #000;
    --font-size-base: 1rem;
    --padding-base: 1.25rem;
}

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

body {
    background: var(--light-grey);
    color: var(--black);
    font-family: Arial, sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.5;
}

header {
    background: var(--dark-maroon);
    color: var(--white);
    padding: calc(var(--padding-base) * 0.8) var(--padding-base);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
}

.logo img {
    height: auto;
    max-height: 5rem;
    width: auto;
}

.logo span {
    font-size: clamp(1.5rem, 6vw, 2.5rem);
    font-weight: bold;
}

.nav-menu {
    width: 100%;
    max-width: 75rem;
    margin-top: 1.25rem;
}

#menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.875rem;
    cursor: pointer;
}

#menu-list {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.9375rem;
}

#menu-list a {
    color: var(--white);
    text-decoration: none;
    font-size: clamp(0.875rem, 3vw, 1.125rem);
}

.hero {
    background: #ddd;
    min-height: 10rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1.25rem, 5vw, 1.875rem);
    text-align: center;
    padding: calc(var(--padding-base) / 2);
}

.ad-unit {
    width: 100%;
    max-width: 60.625rem;
    aspect-ratio: 970 / 250;
    background: #ccc;
    margin: 1.25rem auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1rem, 4vw, 1.5rem);
}

.search-bar {
    max-width: 75rem;
    margin: 0 auto;
    padding: 0 var(--padding-base);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

#calculator-search {
    flex-grow: 1;
    padding: 0.625rem;
    font-size: clamp(0.875rem, 3vw, 1rem);
    border-radius: 0.25rem;
    border: 1px solid #ccc;
}

#search-button {
    padding: 0.625rem 1.25rem;
    font-size: clamp(0.875rem, 3vw, 1rem);
    background: var(--dark-blue);
    color: var(--white);
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
}

.category-section {
    max-width: 75rem;
    margin: 0 auto;
}

.category-section h2 {
    text-align: center;
    font-weight: bold;
    text-transform: uppercase;
    font-size: clamp(1.125rem, 4vw, 1.5rem);
    margin: 1.25rem 0;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr));
    gap: 1.25rem;
    padding: 0 var(--padding-base) var(--padding-base);
}

.calculator-card {
    background: var(--dark-blue);
    color: var(--white);
    padding: 1.25rem;
    text-align: center;
    border-radius: 0.5rem;
    font-size: clamp(0.875rem, 3vw, 1rem);
}

.calculator-card a {
    color: inherit;
    text-decoration: none;
}

.calculator-card.hidden {
    display: none;
}

.category-section.hidden {
    display: none;
}

.testimonials {
    padding: var(--padding-base);
    overflow: hidden;
}

.testimonials h2 {
    font-size: clamp(1.125rem, 4vw, 1.5rem);
}

.testimonials-container {
    display: flex;
    white-space: nowrap;
    animation: scroll 60s linear infinite reverse; /* Added 'reverse' for left to right */
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.testimonial-card {
    background: var(--light-grey);
    color: var(--black);
    padding: 1.25rem;
    margin: 0.625rem;
    min-width: 18.75rem;
    border-radius: 0.5rem;
    display: inline-block;
    overflow: hidden;
    text-overflow: ellipsis;
}

.testimonial-card h3 {
    color: var(--black);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.testimonial-card p {
    color: var(--black);
    font-size: 0.875rem;
}

footer {
    background: var(--dark-maroon);
    color: var(--white);
    padding: var(--padding-base);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr));
    gap: 1.25rem;
    text-align: center;
}

footer h3 {
    font-size: clamp(1rem, 4vw, 1.25rem);
}

footer ul {
    list-style: none;
}

footer a {
    color: var(--white);
    text-decoration: none;
}

.hidden-backlinks {
    display: none;
}

.copyright {
    background: var(--black);
    color: var(--white);
    font-size: 1rem;
    text-align: center;
    padding: 0.625rem;
}

@media (max-width: 62rem) {
    #menu-toggle {
        display: block;
    }
    #menu-list {
        display: none;
        flex-direction: column;
        width: 100%;
    }
    #menu-list.active {
        display: flex;
    }
    .calculator-grid {
        grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    }
    .testimonial-card {
        min-width: 15rem;
    }
}

@media (max-width: 48rem) {
    .ad-unit {
        aspect-ratio: 728 / 90;
    }
    .testimonial-card {
        min-width: 100%;
    }
    .testimonials-container {
        animation-duration: 40s;
    }
    .search-bar {
        flex-direction: column;
    }
    #search-button {
        width: 100%;
    }
}

@media (max-width: 36rem) {
    :root {
        --font-size-base: 0.875rem;
        --padding-base: 1rem;
    }
    .logo span {
        font-size: clamp(1.25rem, 8vw, 2rem);
    }
}

/* For calculator pages */
main form {
    max-width: 37.5rem;
    margin: 1.25rem auto;
    display: flex;
    flex-direction: column;
    gap: 0.9375rem;
    padding: var(--padding-base);
}

main form label {
    font-size: clamp(0.875rem, 3vw, 1rem);
}

main form input, main form button {
    padding: 0.625rem;
    font-size: clamp(0.875rem, 3vw, 1rem);
    border-radius: 0.25rem;
    border: 1px solid #ccc;
}

main form button {
    background: var(--dark-blue);
    color: var(--white);
    cursor: pointer;
}

main #result {
    text-align: center;
    font-weight: bold;
    font-size: clamp(1rem, 4vw, 1.25rem);
}