:root[data-a11y-scheme="dark"],
:root[data-a11y-scheme="dark"] body { background-color: #000000 !important; }
:root[data-a11y-scheme="dark"] .page,
:root[data-a11y-scheme="dark"] .auth-overlay,
:root[data-a11y-scheme="dark"] .search-modal {
  filter: invert(1) hue-rotate(180deg);
}
:root[data-a11y-scheme="dark"] .fig-img,
:root[data-a11y-scheme="dark"] .rich-text img,
:root[data-a11y-scheme="dark"] .page video {

  filter: invert(1) hue-rotate(180deg) grayscale(1) brightness(1.12);
}

:root[data-a11y-scheme="mono"] .page,
:root[data-a11y-scheme="mono"] .auth-overlay,
:root[data-a11y-scheme="mono"] .search-modal {
  filter: grayscale(1) contrast(1.3);
}

:root[data-a11y-font="big"] { zoom: var(--a11y-zoom, 1); }

:root[data-a11y-images="off"] .fig-bg { background-color: #132745 !important; }
:root[data-a11y-images="off"] .fig-bg .fig-img,
:root[data-a11y-images="off"] .rich-text img { visibility: hidden; }

:root[data-a11y-links="underline"] .page a,
:root[data-a11y-links="underline"] .page [role="button"] {
  text-decoration: underline !important;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

:root[data-a11y="on"] .page :is(a, button, input, select, [tabindex]):focus-visible {
  outline: 3px solid #ff800a !important;
  outline-offset: 2px !important;
}

.a11y-toggle {
  flex: none;
  display: flex;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  background: none;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  border-radius: 4px;
}
.a11y-toggle:focus-visible { outline: 2px solid #ff800a; outline-offset: 3px; }
.a11y-toggle > .icon { pointer-events: none; }

:root[data-a11y="on"] .a11y-toggle::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #ff800a;
  box-shadow: 0 0 0 2px #ffffff;
}

.a11y-panel {
  --a11y-bg: #ffffff;
  --a11y-fg: #132745;
  --a11y-muted: #5b6b85;
  --a11y-line: #d9e0ea;
  --a11y-chip: #f4f6f9;
  --a11y-accent: #ff800a;
  --a11y-accent-ink: #ffffff;

  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 300;
  width: 352px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  padding: 20px;
  border: 1px solid var(--a11y-line);
  border-radius: 14px;
  background-color: var(--a11y-bg);
  color: var(--a11y-fg);
  box-shadow: 0 18px 48px rgba(19, 39, 69, 0.18);
  font-family: 'Helvetica Neue', 'HelveticaNeue', Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;

  visibility: hidden;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0.18s;
}
.a11y-panel[data-open] {
  visibility: visible;
  opacity: 1;
  transform: none;
  transition-delay: 0s;
}
:root[data-a11y-scheme="dark"] .a11y-panel {
  --a11y-bg: #0b0b0b;
  --a11y-fg: #ffffff;
  --a11y-muted: #c9c9c9;
  --a11y-line: #4a4a4a;
  --a11y-chip: #1b1b1b;
  --a11y-accent: #ffd400;
  --a11y-accent-ink: #000000;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.6);
}
@media (prefers-reduced-motion: reduce) {
  .a11y-panel { transition: none; }
}

.a11y-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.a11y-title { margin: 0; font-size: 18px; font-weight: 700; line-height: 1.3; }
.a11y-note { margin: 6px 0 16px; font-size: 13px; color: var(--a11y-muted); }

.a11y-close {
  flex: none;
  width: 32px;
  height: 32px;
  margin: -4px -4px 0 0;
  border: 1px solid var(--a11y-line);
  border-radius: 8px;
  background: none;
  color: inherit;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.a11y-close:hover { background-color: var(--a11y-chip); }

.a11y-group { margin: 0 0 16px; padding: 0; border: 0; }
.a11y-legend {
  padding: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--a11y-muted);
}
.a11y-options { display: flex; flex-wrap: wrap; gap: 8px; }

.a11y-option { flex: 1 1 auto; }
.a11y-option > input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.a11y-option > span {
  display: flex;
  gap: 6px;
  min-height: 44px;
  padding: 8px 12px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--a11y-line);
  border-radius: 10px;
  background-color: var(--a11y-chip);
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
}
.a11y-option > span > b { font-weight: 700; }
.a11y-option > span:hover { border-color: var(--a11y-accent); }
.a11y-option > input:checked + span {
  border-color: var(--a11y-accent);
  background-color: var(--a11y-accent);
  color: var(--a11y-accent-ink);
  font-weight: 700;
}
.a11y-option > input:focus-visible + span {
  outline: 3px solid var(--a11y-accent);
  outline-offset: 2px;
}

.a11y-option .a11y-a-1 { font-size: 14px; }
.a11y-option .a11y-a-2 { font-size: 17px; }
.a11y-option .a11y-a-3 { font-size: 20px; }
.a11y-option .a11y-a-4 { font-size: 23px; }

.a11y-reset {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid var(--a11y-line);
  border-radius: 10px;
  background: none;
  color: inherit;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.a11y-reset:hover { background-color: var(--a11y-chip); border-color: var(--a11y-accent); }
.a11y-reset:focus-visible { outline: 3px solid var(--a11y-accent); outline-offset: 2px; }

.a11y-status {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .a11y-panel { top: 8px; right: 8px; left: 8px; width: auto; max-width: none; }
}