:root {
    color-scheme: light dark;
    --bg: #f7f4ed;
    --ink: #16201b;
    --muted: #5e6a63;
    --line: #d7d0c1;
    --panel: #ffffff;
    --surface: #f8faf8;
    --surface-strong: #eef5f2;
    --surface-hover: #e8efe9;
    --surface-hover-strong: #e1eee8;
    --soft-panel: #e8efe9;
    --soft-line: #cadbd0;
    --accent: #0f5559;
    --accent-strong: #083f42;
    --danger: #a83232;
    --button-text: #ffffff;
    --header-bg: #07111f;
    --shadow: rgba(22, 32, 27, 0.08);
    --lifted-shadow: rgba(22, 32, 27, 0.18);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1210;
        --ink: #edf4ef;
        --muted: #b7c5bd;
        --line: #314038;
        --panel: #141c18;
        --surface: #18231e;
        --surface-strong: #1d2b25;
        --surface-hover: #24362e;
        --surface-hover-strong: #2b4037;
        --soft-panel: #1d2b25;
        --soft-line: #3a5046;
        --accent: #7fcfd1;
        --accent-strong: #a7e7e8;
        --danger: #ff9b9b;
        --button-text: #07111f;
        --header-bg: #050b14;
        --shadow: rgba(0, 0, 0, 0.32);
        --lifted-shadow: rgba(0, 0, 0, 0.42);
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
}

.shell {
    width: min(67.5rem, calc(100% - 2rem));
    margin: 0 auto;
    padding: 3rem 0;
}

.site-header {
    margin-bottom: 0.625rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    background: var(--header-bg);
    padding: clamp(0.5rem, 1.5vw, 0.875rem);
    box-shadow: 0 0.5rem 1.5rem var(--shadow);
    overflow: hidden;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    align-items: center;
    margin: 0 0 0.625rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.breadcrumb-separator {
    color: var(--muted);
}

.breadcrumbs a {
    color: var(--accent-strong);
    font-weight: 700;
    text-decoration: none;
}

.breadcrumbs a:hover,
.breadcrumbs a:focus {
    text-decoration: underline;
}

.breadcrumbs span {
    color: var(--muted);
}

.brand-row {
    display: flex;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: clamp(0.75rem, 2vw, 1.5rem);
    width: 100%;
    color: var(--ink);
    font-size: 1.1rem;
    font-weight: 900;
    text-decoration: none;
}

.brand-logo {
    display: block;
    width: auto;
    max-width: min(32%, 12rem);
    height: clamp(4.25rem, 9vw, 6.5rem);
    object-fit: contain;
}

.brand-text {
    flex: 1 1 auto;
    min-width: 0;
    max-width: none;
    color: #2f8fe8;
    font-family: "Brush Script MT", "Segoe Script", "Lucida Handwriting", cursive;
    font-size: clamp(1.9rem, 4.2vw, 3.65rem);
    font-style: italic;
    font-weight: 700;
    line-height: 0.9;
    letter-spacing: 0;
    white-space: nowrap;
    text-shadow:
        0 0.0625rem 0 #d7ecff,
        0.125rem 0.1875rem 0 #0b3262,
        0 0.375rem 1.125rem rgba(47, 143, 232, 0.42);
}

@media (prefers-color-scheme: dark) {
    .brand-text {
        color: #63b6ff;
        text-shadow:
            0 0.0625rem 0 #d7ecff,
            0.125rem 0.1875rem 0 #081d36,
            0 0.375rem 1.125rem rgba(99, 182, 255, 0.5);
    }
}

.converter {
    scroll-margin-top: 1rem;
    background: var(--panel);
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    padding: clamp(1.5rem, 4vw, 2.75rem);
}

.contact-page,
.content-page,
.converters-page {
    background: var(--panel);
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    padding: clamp(1.5rem, 4vw, 2.75rem);
}

.contact-page p,
.content-page p,
.converters-page p {
    max-width: 42.5rem;
    color: var(--muted);
}

.content-page section {
    max-width: 48rem;
    border-top: 0.0625rem solid var(--line);
    margin-top: 1.25rem;
    padding-top: 1.25rem;
}

.content-page h2 {
    margin: 0 0 0.5rem;
    font-size: 1.1rem;
}

.content-page section p:last-child {
    margin-bottom: 0;
}

.directory-filter {
    display: grid;
    gap: 0.375rem;
    max-width: 42.5rem;
    margin-top: 1.125rem;
}

.directory-filter > span:first-child {
    color: var(--ink);
    font-size: 0.95rem;
    font-weight: 800;
}

.directory-filter-status {
    min-height: 1.5rem;
    margin: 0.5rem 0 0;
    font-size: 0.95rem;
}

.converter-directory {
    display: grid;
    gap: 1.125rem;
    margin-top: 1.375rem;
}

.converter-directory-section {
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.125rem;
}

.directory-heading {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
    align-items: baseline;
    justify-content: space-between;
}

.directory-heading h2 {
    margin: 0;
    font-size: 1.25rem;
}

.directory-heading a {
    color: var(--accent-strong);
    font-weight: 700;
    text-decoration: none;
}

.directory-heading a:hover,
.directory-heading a:focus {
    text-decoration: underline;
}

.directory-group {
    margin-top: 0.875rem;
}

.directory-group h3 {
    margin: 0 0 0.625rem;
    font-size: 1rem;
}

.directory-links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.5rem;
}

.directory-links.dense {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 0.875rem;
}

.directory-link-item {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.375rem;
    align-items: center;
}

.directory-link-item .copy-status {
    position: absolute;
    right: 0;
    top: 100%;
    min-height: 1rem;
    color: var(--muted);
    font-size: 0.78rem;
    line-height: 1.2;
}

.directory-links a {
    display: inline-flex;
    align-items: center;
    min-height: 2.375rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.75rem;
    font-weight: 700;
    text-decoration: none;
}

.directory-links a:hover,
.directory-links a:focus {
    background: var(--surface-hover);
}

.directory-all {
    margin-top: 0.875rem;
}

.directory-all summary {
    display: inline-flex;
    align-items: center;
    min-height: 2.625rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.75rem;
    font-weight: 700;
    cursor: pointer;
}

.directory-all summary:hover,
.directory-all summary:focus {
    background: var(--surface-hover);
}

.contact-form {
    display: grid;
    gap: 0.875rem;
    max-width: 42.5rem;
    margin-top: 1.25rem;
}

.contact-form button {
    width: auto;
    justify-self: start;
}

.bot-field {
    position: absolute;
    left: -999rem;
    width: 0.0625rem;
    height: 0.0625rem;
    overflow: hidden;
}

.form-status {
    max-width: 42.5rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    margin: 1rem 0 0;
    padding: 0.75rem 0.875rem;
    font-weight: 800;
}

.form-status p {
    margin: 0;
}

.form-status.success {
    background: var(--surface-strong);
    color: var(--accent-strong);
}

.form-status.error {
    background: var(--surface);
    color: var(--danger);
}

.eyebrow,
.label {
    margin: 0 0 0.5rem;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

h1 {
    max-width: 45rem;
    margin: 0 0 1.75rem;
    font-size: clamp(2rem, 5vw, 4rem);
    line-height: 1.05;
}

.smart-form,
.convert-form {
    display: grid;
    gap: 0.875rem;
    align-items: end;
}

.smart-form {
    grid-template-columns: 1fr auto auto;
    margin-bottom: 0.625rem;
}

.convert-form {
    grid-template-columns: 1fr 1fr auto 1fr auto auto;
    margin-top: 1.375rem;
}

.examples {
    margin: 0;
    color: var(--muted);
    font-size: 0.94rem;
}

.examples a {
    color: var(--accent-strong);
    font-weight: 700;
}

.auto-toggle {
    display: inline-flex;
    gap: 0.5rem;
    align-items: center;
    margin-top: 0.875rem;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
}

.auto-toggle input {
    width: auto;
    min-height: 0;
    margin: 0;
    accent-color: var(--accent);
}

.quick-converters {
    margin-top: 1.125rem;
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.125rem;
}

.quick-converters h2 {
    margin: 0 0 0.625rem;
    font-size: 1rem;
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.625rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.quick-links li {
    display: flex;
}

.quick-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.5rem;
    width: 100%;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.625rem;
    font-size: 0.92rem;
    font-weight: 800;
    text-align: center;
    text-decoration: none;
}

.quick-links a:hover,
.quick-links a:focus {
    background: var(--surface-hover);
}

.recent-conversions {
    margin-top: 1.125rem;
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.125rem;
}

.favorite-conversions {
    margin-top: 1.125rem;
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.125rem;
}

.recent-heading {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.625rem;
}

.recent-heading h2 {
    margin: 0;
    font-size: 1rem;
}

.text-button {
    width: auto;
    min-height: 2.125rem;
    border: 0.0625rem solid var(--line);
    background: var(--surface);
    color: var(--muted);
    padding: 0.375rem 0.625rem;
    font-size: 0.86rem;
}

.text-button:hover,
.text-button:focus {
    background: var(--surface-hover);
    color: var(--ink);
}

.recent-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    gap: 0.625rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.recent-links li {
    display: flex;
}

.recent-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.5rem;
    width: 100%;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface-strong);
    color: var(--accent-strong);
    padding: 0.5rem 0.625rem;
    font-size: 0.9rem;
    font-weight: 800;
    text-align: center;
    text-decoration: none;
}

.recent-links a:hover,
.recent-links a:focus {
    background: var(--surface-hover-strong);
}

.favorite-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(11.875rem, 1fr));
    gap: 0.625rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.favorite-links li {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.375rem;
}

.favorite-links a,
.favorite-links button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.5rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface-strong);
    color: var(--accent-strong);
    padding: 0.5rem 0.625rem;
    font-size: 0.9rem;
    font-weight: 800;
    text-align: center;
    text-decoration: none;
}

.favorite-links button {
    width: auto;
    background: var(--surface);
    color: var(--muted);
    font-size: 0.82rem;
}

.favorite-links a:hover,
.favorite-links a:focus,
.favorite-links button:hover,
.favorite-links button:focus {
    background: var(--surface-hover-strong);
    color: var(--ink);
}

label span {
    display: block;
    margin-bottom: 0.375rem;
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 700;
}

input,
textarea,
button,
.button {
    width: 100%;
    min-height: 2.875rem;
    border-radius: 0.375rem;
    font: inherit;
}

input,
textarea {
    border: 0.0625rem solid var(--line);
    padding: 0.625rem 0.75rem;
}

textarea {
    resize: vertical;
}

.input-wrap {
    position: relative;
    display: block;
}

.input-wrap input {
    padding-right: 2.75rem;
}

.input-wrap input[type="number"] {
    appearance: textfield;
}

.input-wrap input[type="number"]::-webkit-outer-spin-button,
.input-wrap input[type="number"]::-webkit-inner-spin-button {
    appearance: none;
    margin: 0;
}

.field-clear {
    position: absolute;
    top: 50%;
    right: 0.5625rem;
    display: none;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    min-height: 1.75rem;
    border: 0.0625rem solid var(--line);
    border-radius: 62.4375rem;
    background: var(--surface);
    color: var(--muted);
    padding: 0;
    font-size: 0.9rem;
    line-height: 1;
    transform: translateY(-50%);
}

.field-clear:hover,
.field-clear:focus {
    background: var(--surface-hover);
    color: var(--ink);
}

.js-ready .input-wrap.has-value .field-clear {
    display: inline-flex;
}

.js-ready .clear-link {
    display: none;
}

button,
.button {
    border: 0;
    background: var(--accent);
    color: var(--button-text);
    padding: 0.625rem 1.125rem;
    font-weight: 700;
    cursor: pointer;
}

button:hover,
button:focus,
.button:hover,
.button:focus {
    background: var(--accent-strong);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.button.secondary {
    border: 0.0625rem solid var(--line);
    background: var(--surface);
    color: var(--ink);
}

.button.secondary:hover,
.button.secondary:focus {
    background: var(--surface-hover);
}

.directory-copy {
    min-height: 2.375rem;
    width: auto;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--muted);
    padding: 0.375rem 0.5rem;
    font-size: 0.78rem;
    font-weight: 700;
    opacity: 0.72;
}

.directory-copy:hover,
.directory-copy:focus {
    background: var(--surface-hover);
    color: var(--accent-strong);
    opacity: 1;
}

.auto-convert-ready .convert-submit {
    display: none;
}

.swap-fields {
    width: auto;
    min-width: 4.5rem;
    border: 0.0625rem solid var(--line);
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
}

.swap-fields:hover,
.swap-fields:focus {
    background: var(--surface-hover);
    color: var(--ink);
}

.result {
    scroll-margin-top: 6.875rem;
    margin-top: 1.5rem;
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.375rem;
}

.result.error {
    color: var(--danger);
    font-weight: 700;
}

.result h2 {
    margin: 0 0 1.125rem;
    font-size: clamp(1.4rem, 3vw, 2.4rem);
}

.category-context {
    display: inline-flex;
    margin: 0 0 0.75rem;
    color: var(--accent-strong);
    font-size: 0.92rem;
    font-weight: 800;
}

.category-context:hover,
.category-context:focus {
    color: var(--ink);
}

.precision-control {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
    align-items: center;
    margin: 0 0 1rem;
}

.precision-control > span {
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 700;
}

.precision-options {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.precision-options button {
    width: auto;
    min-height: 2.125rem;
    border: 0.0625rem solid var(--line);
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.375rem 0.625rem;
    font-size: 0.86rem;
}

.precision-options button:hover,
.precision-options button:focus,
.precision-options button.is-active {
    background: var(--accent);
    color: var(--button-text);
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
    align-items: center;
    margin: 0 0 0.5rem;
}

.copy-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: auto;
    min-height: 2.375rem;
    border-radius: 0.375rem;
    border: 0.0625rem solid var(--line);
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
}

.copy-button:hover,
.copy-button:focus {
    background: var(--surface-hover);
}

.copy-button.is-saved {
    background: var(--surface-hover-strong);
    color: var(--ink);
}

.copy-status {
    min-height: 1.5rem;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 700;
}

.permalink-note {
    margin: 0 0 1.25rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.conversion-explainer {
    display: grid;
    gap: 0.5rem;
    margin: 0 0 1.25rem;
    border-left: 0.1875rem solid var(--accent);
    background: var(--surface-strong);
    padding: 0.875rem 1rem;
}

.conversion-explainer h3 {
    margin: 0;
    font-size: 1rem;
}

.conversion-explainer p {
    margin: 0;
    color: var(--muted);
}

.unit-notes {
    margin: 0 0 1.25rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    background: var(--surface);
    padding: 0.875rem;
}

.unit-notes h3 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
}

.unit-notes ul {
    display: grid;
    gap: 0.5rem;
    margin: 0;
    padding-left: 1.125rem;
}

.unit-notes li {
    color: var(--muted);
}

.notes {
    display: grid;
    gap: 0.5rem;
    margin: 0 0 1.25rem;
}

.notes p {
    margin: 0;
    border-left: 0.1875rem solid var(--accent);
    background: var(--surface-strong);
    padding: 0.625rem 0.75rem;
    color: var(--muted);
}

.matrix {
    margin: 0 0 1.375rem;
}

.matrix h3 {
    margin: 0 0 0.625rem;
    font-size: 1rem;
}

.matrix-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    overflow: hidden;
}

.matrix-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(5.75rem, auto);
    gap: 0.625rem;
    align-items: center;
    min-height: 2.875rem;
    padding: 0.625rem 0.75rem;
    border-bottom: 0.0625rem solid var(--line);
}

.matrix-row:nth-child(odd) {
    border-right: 0.0625rem solid var(--line);
}

.matrix-row:nth-last-child(-n+2) {
    border-bottom: 0;
}

.matrix-value {
    overflow-wrap: anywhere;
    font-weight: 700;
}

.matrix-unit {
    color: var(--muted);
    text-align: right;
}

.nearby-values {
    margin: 0 0 1.375rem;
}

.nearby-values h3 {
    margin: 0 0 0.625rem;
    font-size: 1rem;
}

.nearby-table {
    display: grid;
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    overflow: hidden;
}

.nearby-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0.75rem;
    align-items: center;
    min-height: 2.75rem;
    border-bottom: 0.0625rem solid var(--line);
    background: var(--surface);
    padding: 0.625rem 0.75rem;
}

.nearby-row:last-child {
    border-bottom: 0;
}

.nearby-row span,
.nearby-row strong {
    overflow-wrap: anywhere;
}

.nearby-row span {
    color: var(--muted);
}

.nearby-row strong {
    text-align: right;
}

dl {
    display: grid;
    gap: 0.625rem;
    margin: 0;
}

dl div {
    display: grid;
    grid-template-columns: 7.5rem 1fr;
    gap: 1rem;
}

dt {
    color: var(--muted);
    font-weight: 700;
}

dd {
    margin: 0;
}

.related {
    margin-top: 1.375rem;
}

.related h3,
.link-panel h3,
.unit-list h3 {
    margin: 0 0 0.625rem;
    font-size: 1rem;
}

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
}

.related-links a {
    display: inline-flex;
    align-items: center;
    min-height: 2.375rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.75rem;
    font-weight: 700;
    text-decoration: none;
}

.related-links a:hover,
.related-links a:focus {
    background: var(--surface-hover);
}

.category-page {
    scroll-margin-top: 6.875rem;
    display: grid;
    gap: 1.375rem;
    margin-top: 1.375rem;
    background: var(--panel);
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    padding: clamp(1.375rem, 3vw, 2.125rem);
}

.category-copy h2 {
    margin: 0 0 0.625rem;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.category-copy p:last-child {
    max-width: 47.5rem;
    margin: 0;
    color: var(--muted);
}

.unit-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
}

.unit-grid.compact {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.unit-grid article {
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    background: var(--surface);
    padding: 0.875rem;
}

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

.unit-card article {
    height: 100%;
}

.unit-card:hover article,
.unit-card:focus article {
    background: var(--surface-hover);
    border-color: var(--soft-line);
}

.unit-grid h4 {
    margin: 0 0 0.25rem;
    font-size: 1rem;
}

.unit-grid p {
    margin: 0;
    color: var(--muted);
}

.unit-details {
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.125rem;
}

.unit-details summary {
    display: inline-flex;
    align-items: center;
    min-height: 2.625rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--accent-strong);
    padding: 0.5rem 0.75rem;
    font-weight: 700;
    cursor: pointer;
}

.unit-details summary:hover,
.unit-details summary:focus {
    background: var(--surface-hover);
}

.unit-details .unit-grid {
    margin-top: 0.875rem;
}

.category-faq,
.conversion-faq {
    display: grid;
    gap: 0.625rem;
    border-top: 0.0625rem solid var(--line);
    padding-top: 1.125rem;
}

.category-faq h3,
.conversion-faq h3 {
    margin: 0;
    font-size: 1rem;
}

.category-faq details,
.conversion-faq details {
    border: 0.0625rem solid var(--line);
    border-radius: 0.5rem;
    background: var(--surface);
    padding: 0;
}

.category-faq summary,
.conversion-faq summary {
    min-height: 2.625rem;
    padding: 0.625rem 0.75rem;
    color: var(--accent-strong);
    font-weight: 800;
    cursor: pointer;
}

.category-faq p,
.conversion-faq p {
    margin: 0;
    border-top: 0.0625rem solid var(--line);
    padding: 0.625rem 0.75rem 0.75rem;
    color: var(--muted);
}

.categories {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.875rem;
    margin-top: 1.125rem;
}

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

.categories article {
    background: var(--surface-hover);
    border: 0.0625rem solid var(--soft-line);
    border-radius: 0.5rem;
    padding: 1rem;
}

.categories h2 {
    margin: 0 0 0.25rem;
    font-size: 1rem;
}

.categories p {
    margin: 0;
    color: var(--muted);
}

.site-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 0.875rem;
    justify-content: center;
    margin-top: 1.375rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.site-footer a {
    color: var(--accent-strong);
    font-weight: 800;
}

.site-footer a:hover,
.site-footer a:focus {
    color: var(--ink);
}

.back-to-top {
    position: fixed;
    right: 1.125rem;
    bottom: 1.125rem;
    z-index: 20;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.625rem;
    border: 0.0625rem solid var(--line);
    border-radius: 0.375rem;
    background: var(--accent);
    color: var(--button-text);
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    font-weight: 800;
    opacity: 0;
    pointer-events: none;
    text-decoration: none;
    transform: translateY(0.5rem);
    box-shadow: 0 0.5rem 1.5rem var(--lifted-shadow);
    transition: opacity 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus {
    background: var(--accent-strong);
}

@media (max-width: 47.5rem) {
    .brand {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.75rem;
        text-align: center;
    }

    .brand-logo {
        max-width: min(100%, 12rem);
        height: clamp(4.5rem, 22vw, 6rem);
    }

    .brand-text {
        max-width: 100%;
        font-size: clamp(1.8rem, 8vw, 2.65rem);
    }

    .smart-form,
    .convert-form,
    .categories,
    .quick-links,
    .directory-links,
    .directory-links.dense,
    .unit-grid.compact,
    .unit-grid {
        grid-template-columns: 1fr;
    }

    dl div {
        grid-template-columns: 1fr;
        gap: 0.125rem;
    }

    .matrix-grid {
        grid-template-columns: 1fr;
    }

    .nearby-row {
        grid-template-columns: 1fr;
        gap: 0.125rem;
    }

    .nearby-row strong {
        text-align: left;
    }

    .matrix-row,
    .matrix-row:nth-child(odd) {
        border-right: 0;
    }

    .matrix-row:nth-last-child(2) {
        border-bottom: 0.0625rem solid var(--line);
    }

    .shell {
        width: min(100% - 1.25rem, 67.5rem);
        padding: 1.125rem 0 4.5rem;
    }

    .back-to-top {
        right: 0.625rem;
        bottom: 0.625rem;
    }
}