.site-header,
body.has-site-shell {
  --site-header-height: 56px;
}

html {
  scroll-padding-top: var(--site-header-height, 56px);
}

.site-skip-link {
  position: fixed;
  z-index: 120;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--navy-950, #07162f);
  color: #fff;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-12px);
}

.site-skip-link:focus {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--site-header-height);
  min-height: var(--site-header-height);
  padding: 7px var(--slide-pad-x, clamp(24px, 5.55vw, 80px));
  border: 0;
  border-bottom: 1px solid rgba(220, 230, 242, 0.62);
  border-radius: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  background: rgba(250, 252, 255, 0.86);
  box-shadow: 0 1px 8px rgba(7, 22, 47, 0.045);
  backdrop-filter: blur(14px) saturate(115%);
}

body.has-site-shell .slide {
  min-height: calc(100svh - var(--site-header-height));
}

body.has-site-shell[data-site-page="home"] .hero__inner {
  min-height: calc(100svh - var(--site-header-height) - var(--slide-pad-y) - 42px);
}

body.has-site-shell[data-site-page="home"] .advantage-layout {
  height: calc(100svh - var(--site-header-height));
}

body.has-site-shell[data-site-page="home"] .solution-map {
  min-height: calc(100svh - var(--site-header-height) - (var(--slide-pad-y) * 2));
}

.site-header__brand {
  width: max-content;
  display: inline-flex;
  align-items: center;
}

.site-header__brand img {
  display: block;
  width: 128px;
  height: auto;
}

.site-header__nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(22px, 2.6vw, 38px);
}

.site-header__nav-link,
.site-header__course-toggle {
  position: relative;
  padding: 10px 0;
  border: 0;
  color: #78869a;
  background: transparent;
  font-family: inherit;
  font-size: 14px;
  font-weight: 650;
  white-space: nowrap;
  transition: color 160ms ease;
}

.site-header__course-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.site-header__course-toggle svg {
  width: 10px;
  height: 7px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  transition: transform 160ms ease;
}

.site-header__course.is-open .site-header__course-toggle svg {
  transform: rotate(180deg);
}

.site-header__nav-link::after,
.site-header__course-toggle::after {
  position: absolute;
  right: auto;
  bottom: 2px;
  left: 50%;
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: var(--teal, #119783);
  opacity: 0;
  transform: translateX(-50%) scaleX(0.35);
  transition: opacity 160ms ease, transform 160ms ease;
  content: "";
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible,
.site-header__nav-link[aria-current="page"],
.site-header__course-toggle:hover,
.site-header__course-toggle:focus-visible,
.site-header__course-toggle[aria-current="page"],
.site-header__course.is-open .site-header__course-toggle {
  color: var(--teal, #119783);
}

.site-header__nav-link[aria-current="page"]::after,
.site-header__course-toggle[aria-current="page"]::after,
.site-header__course.is-open .site-header__course-toggle::after {
  opacity: 1;
  transform: translateX(-50%) scaleX(1);
}

.site-header__course {
  position: relative;
}

.site-header__submenu {
  position: absolute;
  top: calc(100% + 9px);
  left: 50%;
  width: max-content;
  padding: 8px;
  border: 1px solid rgba(220, 230, 242, 0.94);
  border-radius: 18px;
  display: grid;
  grid-template-columns: repeat(4, minmax(72px, 1fr));
  gap: 5px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 18px 44px rgba(7, 22, 47, 0.16);
  backdrop-filter: blur(18px) saturate(135%);
  transform: translateX(-50%);
}

.site-header__submenu[hidden] {
  display: none;
}

.site-header__submenu a {
  padding: 10px 14px;
  border-radius: 12px;
  color: #687890;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
  white-space: nowrap;
  transition: color 160ms ease, background 160ms ease;
}

.site-header__submenu a:hover,
.site-header__submenu a:focus-visible,
.site-header__submenu a[aria-current="page"] {
  color: var(--teal, #119783);
  background: var(--teal-soft, #e6f6f2);
}

.site-header__status {
  display: none;
}

body.has-site-shell .deck-nav {
  z-index: 70;
}

body.has-site-shell .back-link,
body.has-site-shell .detail-back,
body[data-site-page="product-difference"] .topbar {
  display: none;
}

.site-footer {
  position: relative;
  z-index: 20;
  width: 100%;
  min-height: 72px;
  padding: 18px var(--slide-pad-x, clamp(24px, 5.55vw, 80px));
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(24px, 3.2vw, 48px);
  color: #17243c;
  background: #e9ebee;
  font-size: clamp(14px, 1.15vw, 17px);
  line-height: 1.5;
  text-align: center;
  scroll-snap-align: end;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
  text-underline-offset: 0.18em;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  text-decoration: underline;
}

@media (min-width: 761px) {
  body.has-site-shell[data-site-page="zero-basis"] main > .slide:first-child,
  body.has-site-shell[data-site-page="beginner"] main > .slide:first-child {
    padding-top: var(--slide-pad-y);
  }

  body.has-site-shell[data-site-page="beginner"] .beginner-map-slide__inner {
    height: calc(100svh - var(--site-header-height) - (var(--slide-pad-y) * 2));
  }
}

@media (max-width: 760px) {
  .site-header,
  body.has-site-shell {
    --site-header-height: 50px;
  }

  body.has-site-shell[data-site-page="zero-basis"] main > .slide:first-child,
  body.has-site-shell[data-site-page="beginner"] main > .slide:first-child,
  body.has-site-shell[data-site-page="high-stage"] main > .slide:first-child {
    padding-top: var(--slide-pad-y);
  }

  .site-header {
    top: 0;
    width: 100%;
    height: var(--site-header-height);
    min-height: var(--site-header-height);
    padding: 4px 12px;
    border-radius: 0;
    grid-template-columns: 1fr;
  }

  .site-header__brand,
  .site-header__status {
    display: none;
  }

  .site-header__nav {
    width: 100%;
    justify-content: space-around;
    gap: 8px;
  }

  .site-header__nav-link,
  .site-header__course-toggle {
    padding: 8px 2px;
    font-size: 13px;
  }

  .site-header__course-toggle {
    gap: 4px;
  }

  .site-header__submenu {
    position: fixed;
    top: calc(var(--site-header-height) + 8px);
    right: 8px;
    left: 8px;
    width: auto;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    transform: none;
  }

  .site-header__submenu a {
    padding: 10px 6px;
    font-size: 12px;
  }

  .site-footer {
    min-height: 78px;
    padding: 16px 20px;
    flex-direction: column;
    gap: 4px;
    font-size: 12px;
  }
}

@media (max-width: 430px) {
  .site-header__nav-link,
  .site-header__course-toggle {
    font-size: 12px;
  }

}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav-link,
  .site-header__nav-link::after,
  .site-header__course-toggle,
  .site-header__course-toggle::after,
  .site-header__course-toggle svg,
  .site-header__submenu a,
  .site-skip-link {
    transition: none;
  }
}