Add styled legal dialogs with unchanged supplied content

assets/styles.css

@@ -22,6 +22,10 @@
   --color-sand: #e5cd9c;
   --color-announcement: #f2e6cc;
   --color-focus: #ffc300;
+  --color-accent: #ef3a57;
+  --color-dialog: #721a3d;
+  --color-overlay: rgb(24 8 16 / 72%);
+  --color-shadow: rgb(24 8 16 / 45%);
   /* One design unit is one point on the supplied 1200 × 900 layout. */
   --unit: 0.0833333333vw;
   --font-body: Roboto, system-ui, sans-serif;
@@ -284,6 +288,166 @@ address {
   transform: none;
 }
 
+.site-footer {
+  margin-block-start: 28px;
+  border-block-start: 1px solid color-mix(in srgb, var(--color-sand) 35%, transparent);
+  padding-block-start: 8px;
+  color: var(--color-sand);
+  font-size: 14px;
+}
+
+.site-footer nav {
+  display: flex;
+  justify-content: center;
+  gap: 24px;
+}
+
+.site-footer a {
+  display: inline-flex;
+  align-items: center;
+  min-block-size: 44px;
+}
+
+html:has(.legal-dialog[open]),
+html:has(.legal-dialog:target) {
+  overflow: hidden;
+}
+
+.legal-dialog {
+  position: fixed;
+  inset: 0;
+  inline-size: min(48rem, calc(100% - 32px));
+  max-inline-size: none;
+  max-block-size: calc(100svh - 32px);
+  margin: auto;
+  border: 1px solid color-mix(in srgb, var(--color-sand) 45%, transparent);
+  border-block-start: 4px solid var(--color-accent);
+  border-radius: 12px;
+  padding: 0;
+  overflow: hidden;
+  background: var(--color-dialog);
+  color: var(--color-cream);
+  box-shadow: 0 24px 80px var(--color-shadow);
+}
+
+.legal-dialog::backdrop {
+  background: var(--color-overlay);
+  backdrop-filter: blur(5px);
+}
+
+/* Fragment links still open the complete text if JavaScript is unavailable. */
+.legal-dialog:target:not([open]) {
+  display: block;
+  z-index: 3;
+  box-shadow: 0 0 0 100vmax var(--color-overlay);
+}
+
+.legal-shell {
+  display: flex;
+  flex-direction: column;
+  max-block-size: min(54rem, calc(100svh - 38px));
+}
+
+.legal-header {
+  display: flex;
+  flex: none;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  border-block-end: 1px solid color-mix(in srgb, var(--color-sand) 25%, transparent);
+  padding: 12px clamp(18px, 4vw, 36px);
+}
+
+.legal-header img {
+  inline-size: 48px;
+  block-size: 38px;
+}
+
+.legal-close {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 12px;
+  min-block-size: 44px;
+  border-radius: 6px;
+  padding-inline: 12px;
+  color: var(--color-sand);
+  font-size: 14px;
+}
+
+.legal-close:hover {
+  background: color-mix(in srgb, var(--color-cream) 8%, transparent);
+  text-decoration: none;
+}
+
+.legal-close span {
+  font-size: 28px;
+  line-height: 1;
+}
+
+.legal-copy {
+  min-block-size: 0;
+  padding: clamp(20px, 4vw, 36px);
+  overflow: auto;
+  overscroll-behavior: contain;
+  text-align: start;
+  overflow-wrap: anywhere;
+  font-size: 16px;
+  font-style: normal;
+  line-height: 1.65;
+  scrollbar-color: var(--color-sand) var(--color-dialog);
+}
+
+.legal-copy h1 {
+  margin: 0 0 24px;
+  color: var(--color-cream);
+  font-size: clamp(26px, 4vw, 34px);
+  font-style: italic;
+  line-height: 1.2;
+}
+
+.legal-copy h2 {
+  margin: 32px 0 16px;
+  color: var(--color-sand);
+  font-size: 22px;
+  line-height: 1.35;
+}
+
+.legal-copy h3 {
+  margin: 24px 0 12px;
+  color: var(--color-sand);
+  font-size: 18px;
+  line-height: 1.4;
+}
+
+.legal-copy h4 {
+  margin: 20px 0 10px;
+  font-size: 16px;
+  line-height: 1.5;
+}
+
+.legal-copy p,
+.legal-copy ul {
+  margin-block: 0 16px;
+}
+
+.legal-copy ul {
+  padding-inline-start: 24px;
+}
+
+.legal-copy li + li {
+  margin-block-start: 8px;
+}
+
+.legal-copy a {
+  color: var(--color-sand);
+  text-decoration: underline;
+}
+
+.legal-copy > :last-child {
+  margin-block-end: 0;
+}
+
 @media (width > 1024px) {
   body::after {
     position: fixed;