/* Generated by tools/build.py from assets/css/oplo-design.css — the site's bar,
   chapter bar and footer, scoped to this page. Edit the source and rebuild;
   changes made here are overwritten. */

.dv .nav, .dv .chapter, .dv .foot, .dv .notes {
  --paper: #ffffff;
  --canvas: #f5f5f7;
  --void: #000000;
  --void-2: #0b0b0c;
  --ink: #1d1d1f;
  --ink-2: #6e6e73;
  --ink-3: #86868b;
  --ink-lt: #f5f5f7;
  --ink-lt-2:#a1a1a6;
  --blue: #0066cc;
  --blue-dark: #2997ff;
  --rule: #d2d2d7;
  --rule-dark: rgba(255,255,255,.16);
  --font: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --text: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --well: 980px;
  --gutter: 22px;
  --gap: 12px;
  --nav: 44px;
  --ease: cubic-bezier(0.28, 0.11, 0.32, 1);
}

.dv .nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav); z-index: 9000;
}
.dv .nav::before {
  content: ""; position: absolute; inset: 0; z-index: -1; background-color: rgba(255,255,255,.72); -webkit-backdrop-filter: saturate(180%) blur(30px); backdrop-filter: saturate(180%) blur(30px); transition: background-color .45s var(--ease);
}
.dv .bars-dark .nav {
  --paper: #161617; --ink: var(--ink-lt); --ink-2: var(--ink-lt-2); --ink-3: var(--ink-lt-2); --rule: var(--rule-dark); --blue: var(--blue-dark);
}
.dv .bars-dark .nav::before {
  background-color: rgba(22,22,23,.72);
}
.dv body:has(.chapter) .nav {
  position: absolute;
}
.dv body:has(.chapter) :is(.nav-flyout, .nav-find) {
  top: calc(var(--nav) + var(--nav-y, 0px));
}
.dv body:has(.chapter) :is(.nav-scrim, .nav-links) {
  inset: calc(var(--nav) + var(--nav-y, 0px)) 0 0 0;
}
.dv body:has(> main > .band.opening):not(:has(.chapter)) {
  padding-top: 0;
}
.dv body:has(> main > .band.opening):not(:has(.chapter)) > main > .band.opening {
  min-height: 100vh; min-height: 100svh; padding-top: var(--nav);
}
.dv .bars-dark body:not(:has(> main > .band.opening)):not(:has(.chapter)), .dv .bars-dark body:has(.chapter) {
  background: linear-gradient(#000, #000) 0 0 / 100% 97px no-repeat, var(--paper);
}
.dv .nav-in {
  max-width: 1024px; margin-inline: auto; padding-left: max(var(--gutter), env(safe-area-inset-left)); padding-right: max(var(--gutter), env(safe-area-inset-right)); height: var(--nav); display: flex; align-items: center;
}
.dv .nav-brand {
  display: flex; align-items: center; color: var(--ink); flex: none; opacity: .9; transition: opacity .2s;
}
.dv .nav-brand:hover {
  opacity: 1;
}
.dv .nav-brand .mark {
  height: 19px; width: auto; display: block;
}
.dv .nav-links {
  flex: 1 1 auto; display: flex; justify-content: space-evenly; padding: 0 24px; margin: 0;
}
.dv .nav-links a {
  font-size: 12px; letter-spacing: -.01em; color: var(--ink); opacity: .8; transition: opacity .2s;
}
.dv .nav-links a:hover {
  opacity: 1;
}
.dv .nav-end {
  flex: none; display: flex; gap: 18px;
}
.dv .nav-end a {
  font-size: 12px; letter-spacing: -.01em; color: var(--ink); opacity: .8;
}
.dv .nav-end a:hover {
  opacity: 1;
}
.dv .nav-toggle {
  display: none;
}
.dv .nav {
  --menu-ease: cubic-bezier(.32, .72, 0, 1); --menu-spring: cubic-bezier(.34, 1.16, .64, 1);
}
@supports (transition-timing-function: linear(0, 1)) {
.dv .nav {
  --menu-ease: linear(0, 0.004 1.3%, 0.023 3.1%, 0.081 6.3%, 0.175 10.1%, 0.466 20.8%, 0.556 24.5%, 0.623 27.7%, 0.683 30.8%, 0.744 34.6%, 0.795 38.4%, 0.837 42.1%, 0.877 46.5%, 0.911 51.6%, 0.94 57.2%, 0.961 63.5%, 0.986 77.4%, 1); --menu-spring: linear(0, 0.005 1.4%, 0.031 3.4%, 0.057 4.7%, 0.107 6.8%, 0.209 10.1%, 0.544 20.3%, 0.641 23.6%, 0.726 27%, 0.785 29.7%, 0.846 33.1%, 0.896 36.5%, 0.935 39.9%, 0.969 43.9%, 0.992 48%, 1.009 52.7%, 1.017 57.4%, 1.019 67.6%, 1);
}
}
.dv .nav-in {
  position: relative;
}
@media (min-width: 834px) {
.dv .nav-links > li {
  position: relative; display: flex; align-items: center; height: var(--nav);
}
}
.dv .nav-more {
  position: absolute; left: 100%; top: 50%; margin: -7px 0 0 3px; width: 14px; height: 14px; display: flex; align-items: center; justify-content: center; color: var(--ink); opacity: 0; pointer-events: none;
}
.dv .nav-more:focus-visible {
  opacity: .8; pointer-events: auto;
}
.dv .nav-more svg {
  width: 8px; height: 5px; display: block; transition: transform .2s var(--ease);
}
.dv .nav-more[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.dv .nav.menu-open::before {
  background-color: var(--paper);
}
.dv .nav-links > li > a {
  transition: opacity .35s var(--ease);
}
.dv .nav.menu-open .nav-links > li > a {
  opacity: .5;
}
.dv .nav.menu-open .nav-links > li.on > a, .dv .nav.menu-open .nav-links > li > a:hover {
  opacity: 1;
}
.dv .nav-glide {
  position: absolute; left: 0; bottom: 8px; width: 100px; height: 2px; border-radius: 1px; background: var(--ink); transform-origin: 0 50%; opacity: 0; pointer-events: none; transition: transform .5s var(--menu-ease), opacity .25s var(--ease);
}
.dv .nav-glide.on {
  opacity: .85;
}
.dv .nav-glide.snap {
  transition: opacity .25s var(--ease);
}
.dv .nav-flyout {
  position: fixed; top: var(--nav); left: 0; right: 0; z-index: 1; visibility: hidden; pointer-events: none;
}
.dv .nav-flyout.is-open {
  visibility: visible;
}
.dv .nav-flyout-bg {
  position: absolute; inset: 0; background: var(--paper); transform: scaleY(0); transform-origin: 50% 0; will-change: transform; pointer-events: auto; transition: transform .56s var(--menu-ease);
}
.dv .nav-flyout.is-closing .nav-flyout-bg {
  transition: transform .36s cubic-bezier(.4, 0, .2, 1) 50ms;
}
.dv .nav-flyout-bg.snap {
  transition: none;
}
.dv .nav-flyout-in {
  position: relative; display: grid; max-width: 1024px; margin-inline: auto;
}
.dv .nav-menu {
  grid-area: 1 / 1; align-self: start; display: flex; gap: 44px; padding: 38px max(var(--gutter), env(safe-area-inset-right)) 78px max(var(--gutter), env(safe-area-inset-left)); visibility: hidden; pointer-events: none;
}
.dv .nav-menu.on {
  visibility: visible; pointer-events: auto;
}
.dv .nav-menu.out {
  visibility: visible;
}
.dv .nav-menu-col {
  min-width: 0;
}
.dv .nav-menu-col.big {
  min-width: 200px; margin-right: 12px;
}
.dv .nav-menu-h {
  margin: 0 0 14px; font-size: 12px; line-height: 1.33; font-weight: 400; letter-spacing: -.01em; color: var(--ink-2);
}
.dv .nav-menu li {
  margin-bottom: 8px;
}
.dv .nav-menu a {
  display: inline-block; font-size: 12px; line-height: 1.33; font-weight: 600; letter-spacing: -.01em; color: var(--ink); transition: color .15s;
}
.dv .nav-menu-col.big li {
  margin-bottom: 7px;
}
.dv .nav-menu-col.big a {
  font-family: var(--font); font-size: 24px; line-height: 1.17; letter-spacing: .009em;
}
.dv .nav-menu a:hover, .dv .nav-menu a:focus-visible {
  color: var(--blue);
}
.dv .nav-menu-h, .dv .nav-menu li {
  opacity: 0; transform: translate3d(0, -6px, 0); transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.dv .nav-menu.on .nav-menu-h, .dv .nav-menu.on li {
  opacity: 1; transform: none; transition: opacity .4s var(--ease) var(--d, 0ms), transform .5s var(--menu-spring) var(--d, 0ms);
}
.dv .nav-menu.prep .nav-menu-h, .dv .nav-menu.prep li {
  opacity: 0; transform: translate3d(var(--from-x, 0px), var(--from-y, -10px), 0); transition: none;
}
.dv .nav-menu.out .nav-menu-h, .dv .nav-menu.out li {
  opacity: 0; transform: translate3d(var(--to-x, 0px), 0, 0); transition: opacity .16s var(--ease), transform .3s var(--menu-ease);
}
.dv .nav-flyout.is-closing .nav-menu.on .nav-menu-h, .dv .nav-flyout.is-closing .nav-menu.on li {
  opacity: 0; transform: translate3d(0, -4px, 0); transition: opacity .16s var(--ease), transform .24s var(--ease);
}
.dv .nav-scrim.menu-fade {
  animation: none; opacity: 0; transition: opacity .36s var(--ease);
}
.dv .nav-scrim.menu-fade.is-on {
  opacity: 1; transition-duration: .5s;
}
@media (max-width: 833px) {
.dv .nav-more, .dv .nav-flyout, .dv .nav-glide {
  display: none !important;
}
}
@media (prefers-reduced-motion: reduce) {
.dv .nav::before, .dv .nav-glide, .dv .nav-flyout-bg, .dv .nav-menu-h, .dv .nav-menu li, .dv .nav-scrim.menu-fade, .dv .nav-links > li > a {
  transition: none !important;
}
.dv .nav-menu-h, .dv .nav-menu li {
  transform: none !important;
}
}
.dv .nav-search {
  display: flex; align-items: center; justify-content: center; width: 32px; height: var(--nav); margin-right: -8px; color: var(--ink); opacity: .8; transition: opacity .2s;
}
.dv .nav-search:hover, .dv .nav-search[aria-expanded="true"] {
  opacity: 1;
}
.dv .nav-search svg {
  width: 15px; height: 15px; display: block;
}
.dv .nav.searching::before {
  background-color: var(--paper);
}
.dv .nav.searching .nav-links {
  opacity: 0; pointer-events: none; transition: opacity .2s var(--ease);
}
.dv .nav-find {
  position: fixed; top: var(--nav); left: 0; right: 0; z-index: 1; max-height: calc(100vh - var(--nav)); overflow-y: auto; overscroll-behavior: contain; background: var(--paper); animation: nav-find-in .28s var(--ease);
}
.dv .nav-find-in {
  max-width: 692px; margin-inline: auto; padding: 14px max(var(--gutter), env(safe-area-inset-right)) 60px max(var(--gutter), env(safe-area-inset-left));
}
.dv .nav-find-form {
  display: flex; align-items: center; gap: 12px; margin: 0;
}
.dv .nav-find-form > svg {
  width: 22px; height: 22px; flex: none; color: var(--ink-3); display: block;
}
.dv .nav-find-form input {
  flex: 1; min-width: 0; padding: 8px 0; margin: 0; border: 0; outline: 0; background: transparent; font-family: var(--font); font-size: 24px; font-weight: 600; letter-spacing: .007em; color: var(--ink); -webkit-appearance: none; appearance: none; border-radius: 0;
}
.dv .nav-find-form input::placeholder {
  color: var(--ink-3); opacity: 1;
}
.dv .nav-find-form input::-webkit-search-cancel-button {
  -webkit-appearance: none; display: none;
}
.dv .nav-find-clear {
  width: 22px; height: 22px; flex: none; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--ink-3); color: var(--paper); opacity: .7;
}
.dv .nav-find-clear:hover {
  opacity: 1;
}
.dv .nav-find-clear svg {
  width: 8px; height: 8px; display: block;
}
.dv .nav-find-label {
  margin: 28px 0 12px; font-size: 12px; line-height: 1.33; color: var(--ink-2);
}
.dv .nav-find-list a {
  display: flex; align-items: baseline; gap: 12px; padding: 6px 0; font-size: 14px; line-height: 1.3; font-weight: 600; color: var(--ink);
}
.dv .nav-find-list a::before {
  content: "\2192"; flex: none; font-weight: 400; color: var(--ink-3);
}
.dv .nav-find-list a:hover, .dv .nav-find-list a.on {
  color: var(--blue);
}
.dv .nav-find-list a:hover::before, .dv .nav-find-list a.on::before {
  color: var(--blue);
}
.dv .nav-find-list .t {
  flex: none;
}
.dv .nav-find-list .d {
  min-width: 0; font-size: 12px; font-weight: 400; color: var(--ink-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.dv .nav-scrim {
  position: fixed; inset: var(--nav) 0 0 0; z-index: 0; background: rgba(0,0,0,.42); animation: nav-scrim-in .28s var(--ease);
}
@keyframes nav-find-in {
.dv from {
  opacity: 0; transform: translateY(-10px);
}
}
@keyframes nav-scrim-in {
.dv from {
  opacity: 0;
}
}
@media (max-width: 833px) {
.dv .nav-search {
  width: 40px; margin-right: 0;
}
.dv .nav-find {
  bottom: 0; max-height: none;
}
.dv .nav-find-in {
  padding-top: 10px;
}
.dv .nav-find-form input {
  font-size: 20px;
}
.dv .nav-find-list a {
  padding: 11px 0; font-size: 17px;
}
.dv .nav-find-list .d {
  display: none;
}
.dv .nav-scrim {
  display: none;
}
}
@media (prefers-reduced-motion: reduce) {
.dv .nav-find, .dv .nav-scrim {
  animation: none;
}
}
@media (max-width: 833px) {
.dv .nav-links {
  display: flex; flex-direction: column; justify-content: flex-start; position: fixed; inset: var(--nav) 0 0 0; background: var(--paper); padding: 4px max(var(--gutter), env(safe-area-inset-left)) max(40px, env(safe-area-inset-bottom)); overflow-y: auto; overscroll-behavior: contain; visibility: hidden; opacity: 0; transition: opacity .2s var(--ease), visibility 0s linear .2s;
}
.dv .nav-links.open {
  visibility: visible; opacity: 1; transition: opacity .2s var(--ease);
}
.dv .nav-links li {
  border-bottom: 1px solid var(--rule);
}
.dv .nav-links li:last-child {
  border-bottom: 0;
}
.dv .nav-links a {
  font-size: 17px; font-weight: 600; opacity: 0; color: var(--ink); padding: 15px 2px; min-height: 44px; display: flex; align-items: center; justify-content: space-between; transform: translateY(-7px); transition: opacity .32s var(--ease), transform .32s var(--ease);
}
.dv .nav-links a::after {
  content: ""; width: 7px; height: 7px; margin-right: 3px; border-top: 1.5px solid var(--ink-3); border-right: 1.5px solid var(--ink-3); transform: rotate(45deg);
}
.dv .nav-links.open a {
  opacity: 1; transform: none;
}
.dv .nav-links.open li:nth-child(1) a {
  transition-delay: 20ms;
}
.dv .nav-links.open li:nth-child(2) a {
  transition-delay: 42ms;
}
.dv .nav-links.open li:nth-child(3) a {
  transition-delay: 64ms;
}
.dv .nav-links.open li:nth-child(4) a {
  transition-delay: 86ms;
}
.dv .nav-links.open li:nth-child(5) a {
  transition-delay: 108ms;
}
.dv .nav-links.open li:nth-child(6) a {
  transition-delay: 130ms;
}
.dv .nav-links.open li:nth-child(7) a {
  transition-delay: 152ms;
}
.dv .nav-links.open li:nth-child(8) a {
  transition-delay: 174ms;
}
.dv .nav-links a[aria-current="page"] {
  color: var(--ink-3);
}
.dv .nav.open::before {
  background-color: #fff;
}
.dv .nav::before {
  -webkit-backdrop-filter: saturate(180%) blur(10px); backdrop-filter: saturate(180%) blur(10px);
}
.dv .nav-toggle {
  min-width: 44px; min-height: 44px; justify-content: center; align-items: flex-end;
}
.dv .nav-toggle {
  display: flex; flex-direction: column; gap: 4px; order: 3; padding: 8px 0 8px 18px;
}
.dv .nav-toggle span {
  width: 17px; height: 1.5px; background: var(--ink); opacity: .8; transition: transform .3s var(--ease), opacity .2s;
}
.dv .nav-toggle.on span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.dv .nav-toggle.on span:nth-child(2) {
  opacity: 0;
}
.dv .nav-toggle.on span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}
.dv .nav-end {
  order: 2; margin-left: auto;
}
}
.dv .chapter {
  position: sticky; top: 0; z-index: 800; background: rgba(255,255,255,.72); -webkit-backdrop-filter: saturate(180%) blur(30px); backdrop-filter: saturate(180%) blur(30px); border-bottom: 1px solid var(--rule); color: var(--ink); transition: background-color .45s var(--ease), border-color .45s var(--ease), color .45s var(--ease);
}
.dv .bars-dark .chapter {
  --ink: var(--ink-lt); --ink-2: var(--ink-lt-2); background: rgba(22,22,23,.72); border-bottom-color: rgba(255,255,255,.1);
}
.dv .chapter-in {
  max-width: 1024px; margin-inline: auto; padding-left: max(var(--gutter), env(safe-area-inset-left)); padding-right: max(var(--gutter), env(safe-area-inset-right)); height: 52px; display: flex; align-items: center; gap: 20px;
}
.dv .chapter-name {
  font-family: var(--font); font-size: 21px; font-weight: 600; letter-spacing: .011em;
}
.dv .chapter-links {
  margin-left: auto; display: flex; align-items: center; gap: 26px;
}
.dv .chapter-links a {
  font-size: 12px; color: var(--ink-2); white-space: nowrap; transition: color .45s var(--ease);
}
.dv .chapter-links a:hover {
  color: var(--ink);
}
.dv .chapter-cta {
  flex: none; margin-left: 20px; font-size: 12px; line-height: 1; white-space: nowrap; padding: 8px 15px; border-radius: 100px; background: #0071e3; color: #fff; transition: background .2s var(--ease);
}
.dv .chapter-cta:hover {
  background: #0077ed;
}
.dv .chapter-links + .chapter-cta {
  margin-left: 20px;
}
.dv .chapter-links:not(:has(a)) + .chapter-cta, .dv .chapter-name + .chapter-cta {
  margin-left: auto;
}
@media (max-width: 833px) {
.dv .chapter-in {
  height: 48px;
}
.dv .chapter-links {
  gap: 18px; overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch;
}
.dv .chapter-links::-webkit-scrollbar {
  display: none;
}
.dv .chapter-name {
  font-size: 17px; flex: none;
}
.dv .chapter-cta {
  margin-left: 12px; padding: 7px 13px;
}
}
@media (max-width: 734px) {
.dv .chapter-links {
  padding-right: 26px; -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 30px), transparent); mask-image: linear-gradient(90deg, #000 calc(100% - 30px), transparent);
}
}
.dv .chapter-links a.on {
  color: var(--ink);
}
.dv .foot {
  background: var(--canvas); color: var(--ink-2); font-size: 12px; line-height: 1.33;
}
.dv .foot-in {
  max-width: 1024px; margin-inline: auto; padding: 0 var(--gutter);
}
.dv .foot-note {
  padding: 20px 0 8px;
}
.dv .foot-note p {
  margin-bottom: 9px; max-width: 90ch;
}
.dv .foot-note a {
  color: var(--blue);
}
.dv .foot-note a:hover {
  text-decoration: underline;
}
.dv .foot-rule {
  border-top: 1px solid var(--rule);
}
.dv .foot-cols {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 0 26px; padding: 20px 0 24px;
}
.dv .foot-col h3 {
  font-size: 12px; font-weight: 600; color: var(--ink); margin-bottom: 11px;
}
.dv .foot-col li {
  margin-bottom: 9px;
}
.dv .foot-col a:hover {
  color: var(--ink); text-decoration: underline;
}
.dv .foot-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding: 15px 0 max(24px, env(safe-area-inset-bottom));
}
.dv .foot-legal {
  display: flex; flex-wrap: wrap; gap: 4px 10px;
}
.dv .foot-legal a {
  position: relative; padding-right: 11px;
}
.dv .foot-legal a::after {
  content: ""; position: absolute; right: 5px; top: 2px; bottom: 2px; width: 1px; background: var(--rule);
}
.dv .foot-legal a:last-child::after {
  display: none;
}
.dv .foot-legal a:hover {
  color: var(--ink); text-decoration: underline;
}
.dv .foot-region {
  margin-left: auto; color: var(--ink);
}
@media (max-width: 833px) {
.dv .foot-cols {
  grid-template-columns: repeat(2, 1fr);
}
}
@media (max-width: 734px) {
.dv .foot-cols {
  display: block; padding: 0;
}
.dv .foot-col {
  border-bottom: 1px solid var(--rule);
}
.dv .foot-col h3 {
  margin: 0;
}
.dv .foot-col h3 button {
  width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 14px 2px; font-size: 12px; font-weight: 600; color: var(--ink);
}
.dv .foot-col h3 button::after {
  content: ""; width: 7px; height: 7px; margin-right: 4px; border-right: 1px solid var(--ink-2); border-bottom: 1px solid var(--ink-2); transform: translateY(-2px) rotate(45deg); transition: transform .25s var(--ease);
}
.dv .foot-col[data-open="true"] h3 button::after {
  transform: translateY(2px) rotate(225deg);
}
.dv .foot-col ul {
  display: none; padding: 0 2px 16px;
}
.dv .foot-col[data-open="true"] ul {
  display: block;
}
.dv .foot-col li {
  margin-bottom: 13px; font-size: 14px;
}
.dv .foot-region {
  margin-left: 0;
}
}
@media (min-width: 735px) {
.dv .foot-col h3 button {
  pointer-events: none;
}
.dv .foot-col h3 button::after {
  display: none;
}
}
.dv .notes {
  background: var(--canvas); padding: 26px 0 6px;
}
.dv .notes ol {
  max-width: 1024px; margin-inline: auto; padding: 0 var(--gutter); counter-reset: n;
}
.dv .notes li {
  counter-increment: n; font-size: 12px; line-height: 1.4; color: var(--ink-2); margin-bottom: 9px; max-width: 92ch;
}
.dv .notes li::before {
  content: counter(n) ". ";
}
@media (prefers-reduced-motion: reduce) {
  .dv .nav-links, .dv .nav-links a { transition: none !important; }
}