/* R6: compact reference line treatment, small icons, and press-only lift. */
#main { display: flow-root; min-height: calc(100svh - 120px); }
.page-scene { display: flow-root; }
.page-scene:focus, .page-scene :is(h1,h2:where([data-page-heading])):focus { outline: none; }
.page-scene[data-transitioning] { will-change: opacity, transform; }
.header-inner { gap: 20px; padding-left: 32px; padding-right: 32px; }
.main-nav { gap: 18px; }
.main-nav a {
  justify-content: center; gap: 7px; min-height: 48px; padding: 0 12px;
  border: 0; border-radius: 0; background: none;
  color: var(--ink); isolation: isolate;
  box-shadow: none; transform: translateY(0);
  transition: transform .18s ease;
}
.main-nav a > span, .main-nav a > svg { position: relative; z-index: 1; }
.main-nav a > svg { display: block; width: 18px; height: 18px; flex: none; }
.main-nav a[aria-current="page"] { color: var(--red); }
.main-nav a:active {
  transform: translateY(-2px); transition-duration: .1s;
}
.main-nav a:focus-visible { outline: 2px solid var(--red); outline-offset: 5px; }

/* SHANG XIA .btn-border-link: three 100 ms strokes, reverse on pointer leave.
   Provenance and untouched source CSS: references/shangxia-download/source.json.
   Decorative children keep translation and the small press lift separate. */
.main-nav a::before, .main-nav a::after { content: none; }
.main-nav a > .nav-frame {
  position: absolute; inset: 8px 0; z-index: 2; overflow: hidden;
  pointer-events: none; color: inherit;
}
.main-nav .nav-edge { position: absolute; display: block; background: currentColor; pointer-events: none; }
.main-nav .nav-edge-left { left: 0; bottom: 0; width: 1px; height: 0; transition: height .1s .2s ease; }
.main-nav .nav-edge-top { left: 0; top: 0; width: 0; height: 1px; transition: width .1s .1s ease; }
.main-nav .nav-edge-right { right: 0; top: 0; width: 1px; height: 0; transition: height .1s ease; }
.main-nav .nav-edge-bottom { left: 0; bottom: 0; width: 100%; height: 1px; }
@media (hover: hover) {
  .main-nav a:hover .nav-edge-left { height: 100%; transition-delay: 0s; }
  .main-nav a:hover .nav-edge-top { width: 100%; }
  .main-nav a:hover .nav-edge-right { height: 100%; transition-delay: .2s; }
}
.main-nav a:focus-visible .nav-edge-left { height: 100%; transition-delay: 0s; }
.main-nav a:focus-visible .nav-edge-top { width: 100%; }
.main-nav a:focus-visible .nav-edge-right { height: 100%; transition-delay: .2s; }

#learn-view { padding-top: var(--header); min-height: 100svh; }
#learn-view .learn-section {
  padding-top: clamp(55px, 7.5vh, 90px); padding-bottom: 75px;
  min-height: calc(100svh - var(--header));
  background: radial-gradient(ellipse at 75% 10%, #e4e8da80, transparent 65%), var(--paper);
}
#learn-title { font-size: clamp(32px, 3.3vw, 48px); letter-spacing: .04em; }
#learn-view .section-top { margin-bottom: 45px; }
#learn-view .lesson-card { padding-top: 16px; }
#learn-view .lesson-card-art { height: clamp(165px, 18vh, 210px); }
.arrival-scene { padding-top: var(--header); }
.arrival-layout {
  min-height: calc(100svh - var(--header) - 100px); padding-top: 70px; padding-bottom: 75px;
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 65px; align-items: center;
}
.arrival-copy { padding: 0; max-width: 520px; }
.arrival-copy :is(h1,h2:where([data-page-heading])) { font-size: clamp(40px, 4.2vw, 62px); letter-spacing: .06em; margin-bottom: 28px; }
.arrival-copy > p:not(.eyebrow) { color: var(--muted); font-size: 18px; line-height: 2; max-width: 440px; }
.arrival-copy .coming-soon {
  display: inline-flex; gap: 10px; align-items: center; margin-top: 25px;
  border: 1px solid #9ba58980; border-radius: 4px; background: #e8eadf80;
  color: #526346; padding: 7px 15px; font-size: 16px;
}
.arrival-copy .coming-soon::before { content: ""; width: 6px; height: 6px; background: #859675; border-radius: 50%; }
.arrival-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px 28px; margin-top: 32px; }
.arrival-art { margin: 0; min-width: 0; position: relative; }
.arrival-art img {
  display: block; width: 100%; height: auto; mix-blend-mode: multiply;
  mask-image: radial-gradient(ellipse 66% 65% at center, #000 48%, transparent 80%);
}
.arrival-art figcaption { text-align: center; font-family: var(--serif); font-size: 18px; letter-spacing: .12em; color: #6a785e; margin-top: 8px; }
.arrival-scene .eyebrow { font-size: 15px; }
@media (max-width: 1100px) {
  :root { --header: 130px; }
  .header-inner { height: var(--header); display: grid; grid-template-columns: 1fr auto; grid-template-rows: 68px 61px; gap: 0; padding: 0 28px; }
  .site-header .brand { grid-column: 1; grid-row: 1; }
  .languages { grid-column: 2; grid-row: 1; }
  .main-nav { grid-column: 1/-1; grid-row: 2; justify-content: space-between; border-top: 1px solid #d9ddd3; gap: 12px; }
  .main-nav a { flex: 1; min-height: 47px; font-size: 16px; padding: 0 12px; }
  .main-nav a > .nav-frame { inset-block: 7px; }
  .arrival-layout { gap: 35px; padding-top: 65px; padding-bottom: 65px; }
  .arrival-copy > p:not(.eyebrow) { font-size: 17px; }
}
@media (max-width: 700px) {
  :root { --header: 120px; }
  .header-inner { padding: 0 14px; grid-template-rows: 61px 58px; }
  .main-nav { gap: 7px; }
  .main-nav a { min-height: 46px; font-size: 14px; padding: 0 2px; gap: 4px; }
  .main-nav a > svg { width: 14px; height: 14px; }
  #learn-view .learn-section { padding-top: 42px; padding-bottom: 45px; }
  #learn-view .section-top { margin-bottom: 30px; }
  #learn-view .lesson-card-art { height: 150px; }
  #learn-title { font-size: 31px; }
  .arrival-layout { grid-template-columns: minmax(0, 1fr); gap: 20px; padding-top: 45px; padding-bottom: 45px; }
  .arrival-copy { max-width: 550px; }
  .arrival-copy :is(h1,h2:where([data-page-heading])) { font-size: 40px; margin-bottom: 22px; }
  .arrival-copy > p:not(.eyebrow) { font-size: 16px; }
  .arrival-copy .eyebrow { font-size: 13px; }
  .arrival-actions { gap: 15px; margin-top: 26px; }
  .arrival-actions .button { font-size: 16px; padding: 11px 17px; }
  .arrival-art { width: min(100%, 480px); justify-self: center; }
  .arrival-art figcaption { font-size: 16px; letter-spacing: .06em; margin-top: 0; }
}
@media (max-width: 360px) {
  .header-inner { padding: 0 10px; }
  .main-nav { gap: 4px; }
  .main-nav a { font-size: 13px; padding: 0 2px; }
  .main-nav a > svg { display: none; }
  #learn-title { font-size: 28px; }
  #learn-view .lesson-card-art { height: 135px; }
  .arrival-actions { flex-direction: column; align-items: flex-start; gap: 7px; }
}
@media (prefers-reduced-motion: reduce) {
  .main-nav a, .main-nav a:hover, .main-nav a:active, .main-nav a[aria-current="page"] { transform: none; }
  .main-nav .nav-edge-left, .main-nav .nav-edge-right { height: 100%; }
  .main-nav .nav-edge-top { width: 100%; }
}
@media (forced-colors: active) {
  .main-nav a { border: 1px solid ButtonText; }
  .main-nav a[aria-current="page"] { color: LinkText; }
  .arrival-art { display: none; }
}