*, *::before, *::after {
    box-sizing: border-box;
}

:root {
    --field-label-height: 1.125rem;
    --field-input-height: 2.5rem;
    --field-gap: 0.375rem;
    --total-input-block-height: calc(var(--field-label-height) + var(--field-input-height) + var(--field-gap));
    --calculator-card-width: 22rem;
}

/* Page layout: calculator card on top, steps stacked below */
.calculator-page {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    width: 100%;
}

/* Enforce hardware layout boundaries to lock Cumulative Layout Shift to 0.00 */
.calculator-card--tool {
    contain: layout style;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: var(--calculator-card-width);
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: 0.625rem;
    background: var(--color-surface);
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

.calculator-card--tool h1,
.calculator-card-title {
    margin-bottom: var(--space-md);
    font-size: 1.375rem;
    margin-top: 0;
}

.calculator-inputs-wrapper {
    width: 100%;
}

.field--tool {
    display: flex;
    flex-direction: column;
    height: var(--total-input-block-height);
    margin-bottom: 0.75rem;
}

.field--tool label {
    height: var(--field-label-height);
    margin-bottom: var(--field-gap);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text);
}

.field--tool input {
    height: var(--field-input-height);
    font-size: 1rem;
    padding: 0.375rem 0.75rem;
    box-sizing: border-box;
    -webkit-appearance: none;
    -moz-appearance: none;
         appearance: none;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    width: 100%;
    background: var(--color-bg);
    color: var(--color-text);
}

.field--tool input:focus {
    outline: 2px solid rgba(37, 99, 235, 0.35);
    outline-offset: 1px;
    border-color: var(--color-accent);
}

.fraction-result {
    min-height: 2.5rem;
    font-size: 2rem;
    font-family: var(--font-mono);
    font-weight: 700;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-accent);
    line-height: 1.3;
    text-align: center;
}

.fraction-result:empty {
    display: none;
    min-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.conversion-steps {
    width: 100%;
    max-width: 28rem;
    margin-top: 0;
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: 0.625rem;
    background: var(--color-bg);
}

.conversion-steps:empty {
    display: none;
}

.conversion-steps__title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin: 0 0 var(--space-sm);
    color: var(--color-text);
}

.conversion-steps__summary {
    margin: 0 0 var(--space-md);
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-text-muted);
}

.legal-page a {
    color: var(--color-accent);
}

.legal-page a:hover {
    color: var(--color-accent-hover);
}

.conversion-steps__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.conversion-step {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    background: var(--color-surface);
    counter-increment: step;
}

.conversion-steps__list {
    counter-reset: step;
}

.conversion-step::before {
    content: counter(step);
    flex-shrink: 0;
    width: 1.375rem;
    height: 1.375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    line-height: 1;
    margin-top: 0.125rem;
}

.conversion-step__title {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 0.125rem;
    color: var(--color-text);
}

.conversion-step__body {
    margin: 0;
    font-size: 0.8125rem;
    line-height: 1.45;
    color: var(--color-text-muted);
}

.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    position: sticky;
    top: 0;
    z-index: 999;
}

.site-header__inner {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-header__logo {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-text);
    text-decoration: none;
}

.site-header__logo:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.site-header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    font-size: 1rem;
    background: var(--color-surface);
}

.site-header__nav a {
    font-size: 0.9375rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    cursor: pointer;
    outline: none;
    text-decoration: none;
    transition: all 0.2s ease-in-out;
    border-radius: 0.375rem;
    padding: 0.5rem 1rem;
}

.site-header__nav a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

#main-content {
    flex: 1 0 auto;
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.site-bottom {
    flex-shrink: 0;
    width: 100%;
    margin-top: auto;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

.site-footer__inner {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-md) var(--space-lg);
}

.site-footer__left {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.site-footer__breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.site-footer__breadcrumb a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.site-footer__breadcrumb a:hover {
    color: var(--color-accent);
}

.site-footer__breadcrumb-separator {
    color: var(--color-border);
}

.site-footer__breadcrumb-current {
    color: var(--color-text-muted);
    font-weight: 500;
}

.site-footer__inner p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.site-footer__sitemap-link,
.site-footer__nav a {
    font-size: 0.9375rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease-in-out;
    border-radius: 0.375rem;
    padding: 0.5rem 1rem;
}

.site-footer__sitemap-link {
    align-self: flex-start;
    margin-left: -1rem; /* Offset padding to align with copyright text */
}

.site-footer__sitemap-link:hover,
.site-footer__nav a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.site-footer__nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md) var(--space-lg);
}



.legal-page {
    max-width: 42rem;
}

.legal-page h1 {
    margin-bottom: var(--space-sm);
}

.legal-page__meta {
    margin-bottom: var(--space-xl);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.legal-page__section {
    margin-bottom: var(--space-lg);
}

.legal-page__section h2 {
    font-size: 1.0625rem;
    margin-bottom: var(--space-sm);
}

.legal-page__section p {
    margin-bottom: 0;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

/* Navigation Dropdown styling */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown__trigger {
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 0.9375rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0;
}

.dropdown__trigger:hover {
    color: var(--color-accent);
}

.dropdown__arrow {
    transition: transform 0.2s;
}

.dropdown:hover .dropdown__arrow {
    transform: rotate(180deg);
}

.dropdown__menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    min-width: 180px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    z-index: 10;
    padding: 0.25rem 0;
}

.dropdown:hover .dropdown__menu {
    display: block;
}

.dropdown__menu a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.875rem;
}

.dropdown__menu a:hover {
    background-color: var(--color-bg);
    color: var(--color-accent);
}

/* Homepage Categories styling */
.home-categories-section {
    contain: layout style;
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    width: 100%;
}

.home-categories-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.home-categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

@media (min-width: 640px) {
    .home-categories-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.home-category-card {
    display: block;
    padding: 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    background: var(--color-surface);
    text-decoration: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.home-category-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 2px 4px rgba(15, 23, 42, 0.05);
}

.home-category-card h3 {
    margin: 0 0 0.25rem;
    font-size: 1rem;
    color: var(--color-text);
}

.home-category-card p {
    margin: 0;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Button styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 0.375rem;
    transition: all 0.2s ease-in-out;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn--primary {
    background-color: var(--color-accent);
    color: #ffffff;
}

.btn--primary:hover {
    background-color: var(--color-accent-hover);
    color: #ffffff;
    text-decoration: none;
}

.calculator-form {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.btn--calculate {
    width: 100%;
    margin-top: 0.5rem;
    height: var(--field-input-height);
}

/* Error (404) page styling */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    padding: var(--space-xl) 0;
    text-align: center;
}

.error-page__content {
    max-width: 28rem;
    padding: var(--space-xl);
    border: 1px solid var(--color-border);
    border-radius: 0.625rem;
    background: var(--color-surface);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.error-page__badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-accent);
    background-color: rgba(37, 99, 235, 0.1);
    border-radius: 9999px;
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.error-page__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.error-page__description {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: var(--space-md);
}

.error-page__suggestion {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: var(--space-lg);
}

.error-page__actions {
    display: flex;
    justify-content: center;
}

/* Responsiveness Media Queries for Mobile, Tablets, Safari, iOS */
@media (max-width: 768px) {
    /* Header layout for tablets and small screens */
    .site-header__inner {
        padding: var(--space-md);
    }
    
    /* Category grid padding & responsive columns */
    .home-categories-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    /* Layout main content */
    #main-content {
        padding: var(--space-lg) var(--space-md);
    }
    
    /* Stack elements vertically in footer when screen size reduces */
    .site-footer__inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: var(--space-lg);
        padding: var(--space-lg) var(--space-md);
    }
    
    .site-footer__left {
        align-items: center;
    }
    
    .site-footer__breadcrumb {
        justify-content: center;
    }
    
    .site-footer__sitemap-link {
        align-self: center;
        margin-left: 0;
    }
    
    .site-footer__nav {
        justify-content: center;
        gap: var(--space-md) var(--space-lg);
    }
}

@media (max-width: 480px) {
    /* Mobile-specific adjustments (Safari, iOS Safari, Android) */
    .site-header__inner {
        flex-direction: column;
        gap: var(--space-sm);
        padding: var(--space-sm) var(--space-md);
    }

    .site-header__logo {
        font-size: 1.25rem;
    }

    .site-header__nav {
        font-size: 0.875rem;
        gap: var(--space-md);
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .site-header__nav a {
        padding: 0.375rem 0.5rem;
    }

    .dropdown__menu {
        left: 50%;
        transform: translateX(-50%);
        min-width: 160px;
    }

    /* Calculator card responsiveness: fit small devices (like iPhone SE) */
    .calculator-card--tool {
        max-width: 100%;
        padding: 1rem 1.25rem;
    }

    .field--tool input {
        font-size: 16px; /* Prevents auto-zoom on iOS Safari when focused */
    }

    .fraction-result {
        font-size: 1.625rem;
    }

    .conversion-steps {
        padding: 1rem 1.25rem;
    }

    /* Error Page */
    .error-page__content {
        padding: var(--space-lg) var(--space-md);
    }
}