/* Independent translate/scale properties preserve the scroll and tab transforms. */
:is(.button, .icon-button, .scene-tabs button, .scene-options button, .mentor-topics button) {
  transition: translate var(--motion-return) var(--ease-spring),
    scale var(--motion-return) var(--ease-spring),
    background-color var(--motion-ui) var(--ease-ui),
    border-color var(--motion-ui) var(--ease-ui),
    color var(--motion-ui) var(--ease-ui),
    box-shadow var(--motion-ui) var(--ease-ui),
    transform var(--motion-ui) var(--ease-ui);
}
:is(.button, .icon-button, .scene-tabs button, .scene-options button, .text-link, .footer-nav a) svg {
  transition: transform var(--motion-return) var(--ease-spring);
}
.text-link { transition: color var(--motion-ui) var(--ease-ui); }
.scene-options button { position: relative; isolation: isolate; transition-property: translate, scale, background-color, border-color, color, box-shadow; }
.scene-options button > span, .mentor-topics button > div, .mentor-topics button > span {
  transition: transform var(--motion-ui) var(--ease-ui), color var(--motion-ui) var(--ease-ui);
}
.scene-tabs button:focus-visible { box-shadow: 0 5px 0 #0864ef20; }
.scene-options button:focus-visible { border-color: var(--blue); background: var(--blue-soft); }
.mentor-topics button:focus-visible { background: var(--white); border-color: var(--blue); }
:is(.desktop-nav, .mobile-nav, .footer-nav) a {
  position: relative;
  transition: color var(--motion-ui) var(--ease-ui), background-color var(--motion-ui) var(--ease-ui);
}
:is(.desktop-nav, .footer-nav) a::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 6px;
  height: 1px; background: var(--blue); transform: scaleX(0); transform-origin: right;
  transition: transform var(--motion-ui) var(--ease-ui);
}
:is(.desktop-nav, .footer-nav) a:focus-visible::after { transform: scaleX(1); transform-origin: left; }

/* Details remains usable without scripts. JS temporarily measures only the answer. */
.faq-list { min-width: 0; }
.faq details { border-color: #ccd6e4; }
.faq details:first-child { margin-top: 0; }
.faq summary { border-radius: var(--radius); padding-inline: 14px; margin-inline: -14px; transition: background-color var(--motion-ui) var(--ease-ui), color var(--motion-ui) var(--ease-ui); }
.faq summary svg { width: 20px; height: 20px; transition: transform var(--motion-return) var(--ease-ui), color var(--motion-ui) var(--ease-ui); }
.faq summary:focus-visible { background: #e7edf8; color: var(--blue); }
.faq details[open] summary { color: var(--blue); }
.faq details[open] summary svg { transform: rotate(45deg); }
.faq details[data-expanded="false"] summary { color: var(--ink); }
.faq details[data-expanded="false"] summary svg { transform: rotate(0); }
.faq-answer { display: flow-root; overflow: clip; }
.faq-answer-inner { padding: 0 32px 26px 0; }
.faq .faq-answer p { margin: 0; line-height: 1.9; color: #4d5c6c; }

/* A readable end to the page. Never fade the footer's content as a scroll prerequisite. */
.site-footer { position: relative; display: block; background: var(--white); color: var(--ink); padding: 0; min-height: 0; }
.footer-rule { height: 3px; background: var(--blue); transform-origin: left; }
.footer-shell { padding-top: 64px; padding-bottom: 28px; }
.footer-main { display: grid; grid-template-columns: 1.3fr 1fr; gap: 64px; padding-bottom: 48px; }
.site-footer .brand { font-size: 38px; gap: 16px; min-height: 60px; }
.site-footer .brand img { width: 70px; height: 42px; }
.site-footer .footer-identity > p { margin-top: 16px; font-size: 15px; color: #526171; }
.footer-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.footer-nav h2 { font-size: 12px; font-weight: 500; color: var(--muted); line-height: 1.6; margin-bottom: 16px; }
.footer-nav a { display: flex; align-items: center; justify-content: space-between; gap: 22px; min-height: 44px; width: fit-content; min-width: 140px; font-size: 14px; }
.footer-nav svg { width: 15px; height: 15px; color: #6b7b8c; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; border-top: 1px solid var(--line); padding-top: 22px; }
.footer-credit { display: flex; align-items: center; gap: 28px; text-align: left; }
.site-footer .footer-credit p { font-size: 14px; color: #526171; }
.footer-credit strong { color: var(--ink); font-weight: 650; }
.footer-credit > span { color: var(--muted); font-size: 12px; }
.site-footer .footer-back { font-size: 13px; gap: 14px; flex-shrink: 0; }
.footer-back > span { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid #cddcf3; border-radius: 50%; background: var(--blue-soft); color: var(--blue); transition: background-color var(--motion-ui) var(--ease-ui), color var(--motion-ui) var(--ease-ui); }

@media (hover: hover) and (pointer: fine) {
  .button:not(:disabled):not([aria-disabled="true"]):hover { translate: 0 -3px; scale: 1.015; }
  .button:not([aria-disabled="true"]):hover svg { transform: translateY(2px); }
  .icon-button:not(:disabled):hover { translate: 0 -2px; scale: 1.06; border-color: #a5bee5; }
  .icon-button:not(:disabled):hover svg { transform: rotate(-12deg); }
  #reset-scene:hover svg, #retry-release:not(:disabled):hover svg { transform: rotate(-55deg); }
  .scene-tabs button:hover { translate: 0 -5px; scale: 1.035; border-color: var(--blue); box-shadow: 0 5px 0 #0864ef15; }
  .scene-tabs button:hover svg { transform: rotate(-12deg); }
  .scene-options button:hover { background: var(--blue); border-color: var(--blue); color: var(--white); box-shadow: 0 4px 12px #0864ef17; }
  .scene-options button:hover > span { transform: translateX(4px); }
  .scene-options button:hover svg { transform: translate(3px, -3px); }
  .mentor-topics button:hover { background: var(--white); border-color: #91add4; box-shadow: 0 4px 10px #2550470a; }
  .mentor-topics button:hover > div { transform: translateX(3px); }
  .mentor-topics button:hover > span { color: var(--blue); }
  .faq summary:hover { color: var(--blue); background: #e7edf8; }
  .faq details:not([open]) summary:hover svg { transform: rotate(90deg); }
  .faq details[data-expanded="false"] summary:hover svg { transform: rotate(90deg); }
  .text-link:hover, .footer-nav a:hover { color: var(--blue); }
  :is(.desktop-nav, .footer-nav) a:hover::after { transform: scaleX(1); transform-origin: left; }
  .mobile-nav a:hover { background: var(--blue-soft); color: var(--blue); }
  .footer-nav a:hover svg { transform: translate(2px, -2px); color: var(--blue); }
  .footer-back:hover > span { background: var(--blue); color: var(--white); }
  .text-link[href="#top"]:hover svg { transform: translateY(-3px); }
}
:is(.button, .icon-button, .scene-tabs button):not(:disabled):not([aria-disabled="true"]):active { translate: 0 1px; scale: .98; transition-duration: var(--motion-fast); }
.scene-options button:active { scale: .99; transition-duration: var(--motion-fast); }
.button:disabled, .button[aria-disabled="true"], .icon-button:disabled { translate: none; scale: none; box-shadow: none; }

@media (max-width: 767px) {
  .footer-shell { padding-block: 38px 22px; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; padding-bottom: 28px; }
  .site-footer .brand { font-size: 32px; gap: 12px; }
  .site-footer .brand img { width: 58px; height: 36px; }
  .site-footer .footer-identity > p { margin-top: 10px; font-size: 14px; width: auto; }
  .footer-nav { gap: 24px; }
  .footer-nav h2 { margin-bottom: 10px; }
  .footer-nav a { min-width: 0; width: 100%; max-width: 155px; font-size: 13px; gap: 12px; }
  .footer-bottom { gap: 16px; padding-top: 20px; }
  .footer-credit { order: 0; width: auto; display: block; }
  .site-footer .footer-credit p { font-size: 13px; width: auto; }
  .footer-credit > span { display: block; font-size: 10px; margin-top: 6px; }
  .site-footer .footer-back { font-size: 11px; gap: 8px; }
  .faq-answer-inner { padding: 0 12px 22px 0; }
  .faq summary { padding-inline: 10px; margin-inline: -10px; }
}
@media (prefers-reduced-motion: reduce) {
  :is(.button, .icon-button, .scene-tabs button, .scene-options button):is(:hover, :active) { translate: none; scale: none; }
  :is(.button, .icon-button, .scene-tabs button, .scene-options button, .text-link, .footer-nav a):hover svg,
  .scene-options button:hover > span, .mentor-topics button:hover > div { transform: none; }
}