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

:root {
    --page-bg: #ffffff;
    --page-text: #111111;
    --muted-text: #333333;
    --panel-bg: #f4f4f4;
    --panel-border: #111111;
    --link-color: #003f8f;
    --link-hover: #000000;
    --button-bg: #ffffff;
    --button-text: #111111;
    --button-border: #111111;
    --button-active-bg: #111111;
    --button-active-text: #ffffff;
    --focus-ring: #ffbf00;
}

body[data-theme="black"] {
    --page-bg: #000000;
    --page-text: #ffffff;
    --muted-text: #ffffff;
    --panel-bg: #111111;
    --panel-border: #ffffff;
    --link-color: #ffff66;
    --link-hover: #ffffff;
    --button-bg: #000000;
    --button-text: #ffffff;
    --button-border: #ffffff;
    --button-active-bg: #ffffff;
    --button-active-text: #000000;
    --focus-ring: #00ffff;
}

body[data-theme="blue"] {
    --page-bg: #eaf6ff;
    --page-text: #061b3a;
    --muted-text: #10294d;
    --panel-bg: #d8ecff;
    --panel-border: #061b3a;
    --link-color: #003f8f;
    --link-hover: #061b3a;
    --button-bg: #eaf6ff;
    --button-text: #061b3a;
    --button-border: #061b3a;
    --button-active-bg: #061b3a;
    --button-active-text: #ffffff;
    --focus-ring: #b25400;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--page-text);
    background: var(--page-bg);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    line-height: 1.6;
}

body[data-font-family="serif"] {
    font-family: Georgia, "Times New Roman", serif;
}

body[data-font-size="large"] {
    font-size: 22px;
}

body[data-font-size="xlarge"] {
    font-size: 26px;
}

body[data-spacing="wide"] {
    line-height: 1.9;
    letter-spacing: 0.04em;
}

body[data-images="off"] img {
    display: none !important;
}

body[data-images="off"] .brand-text {
    display: inline;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--link-color);
    text-decoration: underline;
    text-underline-offset: 0.18em;
}

a:hover {
    color: var(--link-hover);
}

a:focus,
button:focus,
summary:focus,
[tabindex="-1"]:focus {
    outline: 4px solid var(--focus-ring);
    outline-offset: 4px;
}

button {
    min-height: 44px;
    padding: 10px 14px;
    color: var(--button-text);
    background: var(--button-bg);
    border: 2px solid var(--button-border);
    border-radius: 4px;
    font: inherit;
    cursor: pointer;
}

button[aria-pressed="true"],
.reset-button:active {
    color: var(--button-active-text);
    background: var(--button-active-bg);
}

h1,
h2,
h3 {
    color: var(--page-text);
    line-height: 1.2;
    margin: 0 0 18px;
}

h1 {
    font-size: 2.2em;
}

h2 {
    font-size: 1.65em;
}

h3 {
    font-size: 1.25em;
    margin-top: 28px;
}

p,
ol,
ul,
dl,
address {
    margin-top: 0;
    margin-bottom: 20px;
}

address {
    font-style: normal;
}

.a11y-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.skip-link {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 1000;
    padding: 12px 16px;
    color: var(--button-active-text);
    background: var(--button-active-bg);
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header,
.settings-panel,
.site-footer {
    background: var(--panel-bg);
    border-bottom: 2px solid var(--panel-border);
}

.site-footer {
    border-top: 2px solid var(--panel-border);
    border-bottom: 0;
    padding: 24px 0;
}

.header-row {
    display: flex;
    align-items: center;
    gap: 20px;
    min-height: 96px;
    padding: 18px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--page-text);
    font-weight: 700;
    text-decoration: none;
}

.brand img {
    width: 150px;
}

.brand-text {
    display: none;
}

.top-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 14px 20px;
    margin-left: auto;
}

.normal-version {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 12px;
    border: 2px solid var(--panel-border);
    text-decoration: none;
}

.settings-panel {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 10px 0;
}

.settings-toggle-row {
    display: flex;
    justify-content: flex-end;
}

.settings-toggle {
    min-width: min(100%, 340px);
    color: var(--button-active-text);
    background: var(--button-active-bg);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    align-items: start;
    margin-top: 12px;
}

.settings-grid[hidden] {
    display: none;
}

fieldset {
    min-width: 0;
    margin: 0;
    padding: 12px;
    border: 2px solid var(--panel-border);
    border-radius: 4px;
}

legend {
    padding: 0 6px;
    font-weight: 700;
}

fieldset button {
    margin: 4px 4px 4px 0;
}

.reset-button {
    align-self: stretch;
}

.hero-section {
    padding: 56px 0;
    border-bottom: 2px solid var(--panel-border);
}

.eyebrow {
    margin-bottom: 10px;
    color: var(--muted-text);
    font-weight: 700;
    text-transform: uppercase;
}

.lead {
    max-width: 840px;
    font-size: 1.2em;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.primary-action,
.secondary-action {
    display: inline-flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 16px;
    border: 2px solid var(--panel-border);
    text-decoration: none;
}

.primary-action {
    color: var(--button-active-text);
    background: var(--button-active-bg);
}

.secondary-action {
    color: var(--page-text);
    background: transparent;
}

.content-section {
    padding: 48px 0;
    border-bottom: 2px solid var(--panel-border);
}

.contents-list,
.plain-list,
.document-list {
    padding-left: 1.4em;
}

.contents-list li,
.plain-list li,
.document-list li {
    margin-bottom: 12px;
}

.a11y-calculator-block {
    margin-top: 28px;
}

.credit-calculator-toggle {
    color: var(--button-active-text);
    background: var(--button-active-bg);
}

.a11y-credit-calculator {
    margin-top: 18px;
    padding: 20px;
    background: var(--panel-bg);
    border: 2px solid var(--panel-border);
    border-radius: 4px;
}

.a11y-credit-calculator[hidden] {
    display: none;
}

.calc-tabs,
.calc-payment-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.calc-tabs button.is-active {
    color: var(--button-active-text);
    background: var(--button-active-bg);
}

.calc-label,
.a11y-form label {
    display: block;
    margin: 18px 0 8px;
    font-weight: 700;
}

.calc-range-meta,
.calc-summary div {
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

.calc-range-meta {
    margin-bottom: 8px;
}

.calc-range-meta strong,
.calc-payment strong {
    font-size: 1.2em;
}

.a11y-credit-calculator input[type="range"],
.a11y-credit-calculator input[type="text"],
.a11y-form input,
.a11y-form textarea {
    width: 100%;
}

.a11y-credit-calculator input[type="range"] {
    min-height: 44px;
}

.a11y-credit-calculator input[type="text"],
.a11y-form input,
.a11y-form textarea {
    min-height: 48px;
    padding: 10px 12px;
    color: var(--page-text);
    background: var(--page-bg);
    border: 2px solid var(--panel-border);
    border-radius: 4px;
    font: inherit;
}

.calc-payment,
.calc-summary {
    margin-top: 22px;
}

.calc-summary div {
    padding: 10px 0;
    border-top: 2px solid var(--panel-border);
}

.calc-summary dt {
    font-weight: 700;
}

.calc-summary dd {
    margin: 0;
    text-align: right;
}

.a11y-form {
    margin: 18px 0 34px;
    padding: 20px;
    background: var(--panel-bg);
    border: 2px solid var(--panel-border);
    border-radius: 4px;
}

.a11y-form button {
    margin-top: 18px;
    color: var(--button-active-text);
    background: var(--button-active-bg);
}

.a11y-form-status {
    margin-top: 16px;
    font-weight: 700;
}

.facts-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.facts-list div {
    padding: 16px;
    border: 2px solid var(--panel-border);
    border-radius: 4px;
}

.facts-list dt {
    font-size: 1.35em;
    font-weight: 700;
}

.facts-list dd {
    margin: 8px 0 0;
}

details {
    border-top: 2px solid var(--panel-border);
    padding: 18px 0;
}

details:last-child {
    border-bottom: 2px solid var(--panel-border);
}

summary {
    font-size: 1.1em;
    font-weight: 700;
    cursor: pointer;
}

summary::marker {
    color: var(--page-text);
}

details > *:not(summary) {
    margin-top: 16px;
}

@media (max-width: 980px) {
    .header-row {
        align-items: flex-start;
        flex-direction: column;
    }

    .top-nav {
        margin-left: 0;
    }

    .settings-grid,
    .facts-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    body {
        font-size: 17px;
    }

    body[data-font-size="large"] {
        font-size: 20px;
    }

    body[data-font-size="xlarge"] {
        font-size: 23px;
    }

    .a11y-shell {
        width: min(100% - 24px, 1120px);
    }

    .settings-panel {
        position: static;
    }

    .settings-grid,
    .facts-list {
        grid-template-columns: 1fr;
    }

    .top-nav,
    .action-row {
        flex-direction: column;
        align-items: flex-start;
    }

    h1 {
        font-size: 1.8em;
    }
}