/*
 * The new site's header (components/site-header.tsx) for the original-site pages, which sit
 * outside the app and its Tailwind styles. Keep the two in step. Everything is prefixed `ia-` and
 * set explicitly, because the original theme styles bare links, lists and buttons. Sizes are in px
 * because that theme shrinks the root font size on smaller screens.
 */
@font-face {
  font-family: "IA DM Sans";
  font-weight: 500;
  font-display: swap;
  src: url("fonts/ia-dm-sans-500.ttf") format("truetype");
}
@font-face {
  font-family: "IA Lexend";
  font-weight: 400;
  font-display: swap;
  src: url("fonts/ia-lexend-400.ttf") format("truetype");
}

/* The original header stays in the page, hidden, because the theme's script looks it up. */
#masthead {
  display: none !important;
}

.ia-header,
.ia-panel {
  --ia-ink: #1d1827;
  --ia-brand: #8977a7;
  --ia-brand-deep: #6b5a8a;
  --ia-brand-deeper: #54456f;
  --ia-brand-soft: #d9d2e7;
  --ia-lilac: #f2f0fe;
  --ia-muted: #6c6679;
  --ia-line: #e7e3ee;
  --ia-ease: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: "DM Sans", ui-sans-serif, system-ui, sans-serif;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.7;
  color: #4a4458;
}
.ia-header *,
.ia-panel * {
  box-sizing: border-box;
}

.ia-header {
  position: sticky;
  top: 0;
  z-index: 50;
  box-sizing: border-box;
  border-bottom: 1px solid color-mix(in oklab, var(--ia-line) 70%, transparent);
  background: rgb(255 255 255 / 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: background-color 300ms;
}
@supports (backdrop-filter: blur(1px)) {
  .ia-header {
    background: rgb(255 255 255 / 0.8);
  }
}
.ia-header[data-open] {
  background: #fff;
}
/* Pages whose hero originally ran under a transparent header: keep the content where it was. */
.ast-theme-transparent-header .ia-header {
  margin-bottom: -73px;
}

.ia-bar,
.ia-panel-nav {
  width: 100%;
  max-width: 1216px;
  margin-inline: auto;
  padding-inline: 20px;
}
.ia-bar {
  display: flex;
  height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.ia-logo {
  display: inline-flex;
  min-height: 44px;
  flex-shrink: 0;
  align-items: center;
  margin-left: -4px;
  border-radius: 6px;
  padding: 4px;
}
.ia-logo img {
  display: block;
  width: 70px;
  max-width: none;
  height: auto;
}

.ia-nav {
  display: none;
}
.ia-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.ia-nav li {
  margin: 0;
}
.ia-nav a,
.ia-nav a:visited,
.ia-nav a:focus {
  position: relative;
  border-radius: 9999px;
  padding: 8px 12px;
  font-family: "IA DM Sans", "DM Sans", ui-sans-serif, system-ui, sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: color-mix(in oklab, var(--ia-ink) 80%, transparent);
  text-decoration: none;
  transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}
.ia-nav a::after {
  content: "";
  position: absolute;
  inset-inline: 12px;
  bottom: -2px;
  height: 1px;
  background: var(--ia-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
}
.ia-nav a:hover,
.ia-nav a[aria-current="page"] {
  color: var(--ia-brand-deep);
}
.ia-nav a:hover::after,
.ia-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.ia-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.ia-book,
.ia-book:visited,
.ia-book:focus {
  display: none;
  min-height: 44px;
  align-items: center;
  border-radius: 9999px;
  background: var(--ia-brand-deep);
  padding-inline: 20px;
  font-family: "IA DM Sans", "DM Sans", ui-sans-serif, system-ui, sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: #fff;
  text-decoration: none;
  transition: background-color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}
.ia-book:hover {
  background: var(--ia-brand-deeper);
  color: #fff;
}

.ia-header button.ia-toggle,
.ia-header button.ia-toggle:focus {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 9999px;
  background: transparent;
  padding: 0;
  color: var(--ia-ink);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  transition: background-color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}
.ia-header button.ia-toggle:hover {
  background: var(--ia-lilac);
  color: var(--ia-ink);
}
.ia-icon {
  position: relative;
  display: block;
  width: 22px;
  height: 16px;
}
.ia-icon > span {
  position: absolute;
  inset-inline: 0;
  top: 50%;
  height: 1.5px;
  margin-top: -0.75px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 360ms var(--ia-ease);
}
.ia-icon > span:first-child {
  transform: translateY(-4px);
}
.ia-icon > span:last-child {
  transform: translateY(4px);
}
.ia-icon[data-open] > span:first-child {
  transform: rotate(45deg);
}
.ia-icon[data-open] > span:last-child {
  transform: rotate(-45deg);
}

.ia-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  border: 0;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Rendered outside the header: its backdrop-filter would become this panel's containing block. */
.ia-panel {
  position: fixed;
  inset: 72px 0 0;
  z-index: 40;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: #fff;
  opacity: 0;
  transform: translateY(-12px);
  visibility: hidden;
  transition:
    opacity 320ms var(--ia-ease),
    transform 420ms var(--ia-ease),
    visibility 0s linear 420ms;
}
.ia-panel[data-open] {
  /* Above the original site's floating language switcher, which would cover the menu's last line. */
  z-index: 2147483647;
  opacity: 1;
  transform: none;
  visibility: visible;
  transition:
    opacity 320ms var(--ia-ease),
    transform 420ms var(--ia-ease),
    visibility 0s;
}
.ia-panel-nav {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  padding-block: 24px;
}
.ia-panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.ia-panel li {
  margin: 0;
}
.ia-panel li + li {
  border-top: 1px solid var(--ia-line);
}
.ia-item {
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 320ms var(--ia-ease),
    transform 420ms var(--ia-ease);
}
.ia-panel[data-open] .ia-item {
  opacity: 1;
  transform: none;
  transition-delay: calc(60ms + var(--i, 0) * 35ms);
}
.ia-panel li a,
.ia-panel li a:visited,
.ia-panel li a:focus {
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: space-between;
  font-family: "IA Lexend", ui-sans-serif, system-ui, sans-serif;
  font-size: 24px;
  line-height: 32px;
  color: var(--ia-ink);
  text-decoration: none;
  transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}
.ia-panel li a:hover {
  color: var(--ia-ink);
}
.ia-panel li a:active,
.ia-panel li a[aria-current="page"] {
  color: var(--ia-brand-deep);
}
.ia-arrow {
  font-size: 18px;
  line-height: 28px;
  color: color-mix(in oklab, var(--ia-brand) 60%, transparent);
}
.ia-panel-foot {
  margin-top: auto;
  padding-top: 40px;
}
.ia-panel-book,
.ia-panel-book:visited,
.ia-panel-book:focus,
.ia-panel-book:hover {
  display: flex;
  min-height: 48px;
  width: 100%;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  background: var(--ia-brand-deep);
  padding-inline: 24px;
  font-family: "IA DM Sans", "DM Sans", ui-sans-serif, system-ui, sans-serif;
  font-weight: 500;
  color: #fff;
  text-decoration: none;
}
.ia-panel-book:active {
  background: var(--ia-brand-deeper);
}
.ia-panel-write {
  margin: 16px 0 0;
  text-align: center;
  font-size: 14px;
  line-height: 20px;
  color: var(--ia-muted);
}
.ia-panel-write a,
.ia-panel-write a:visited,
.ia-panel-write a:focus {
  font-family: "IA DM Sans", "DM Sans", ui-sans-serif, system-ui, sans-serif;
  font-weight: 500;
  color: var(--ia-brand-deep);
  text-decoration: underline;
  text-decoration-color: var(--ia-brand-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
}
.ia-header :focus-visible,
.ia-panel :focus-visible {
  outline: 2px solid var(--ia-brand-deep);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (min-width: 640px) {
  .ia-book,
  .ia-book:visited,
  .ia-book:focus {
    display: inline-flex;
  }
}
@media (min-width: 768px) {
  .ia-bar,
  .ia-panel-nav {
    padding-inline: 32px;
  }
}
@media (min-width: 1024px) {
  .ia-bar {
    height: 80px;
    gap: 16px;
  }
  .ast-theme-transparent-header .ia-header {
    margin-bottom: -81px;
  }
  .ia-logo img {
    width: 80px;
  }
  .ia-nav {
    display: block;
  }
  .ia-header button.ia-toggle,
  .ia-panel {
    display: none;
  }
}
@media (min-width: 1280px) {
  .ia-bar {
    gap: 24px;
  }
  .ia-nav a,
  .ia-nav a:visited,
  .ia-nav a:focus {
    padding-inline: 16px;
  }
  .ia-nav a::after {
    inset-inline: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ia-header *,
  .ia-panel,
  .ia-panel * {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}