.main-nav .nav-menu {
  position: relative;
}

.main-nav .nav-menu::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  width: min(1080px, calc(100vw - 96px));
  height: 28px;
  transform: translateX(-50%);
  pointer-events: none;
}

.main-nav .nav-menu[open]::after,
.main-nav .nav-menu:hover::after,
.main-nav .nav-menu:focus-within::after {
  pointer-events: auto;
}

.main-nav .nav-menu > summary {
  padding: 10px 13px;
  display: flex;
  align-items: center;
  gap: 5px;
  list-style: none;
  border-radius: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 640;
  cursor: pointer;
  transition: color 160ms ease, background-color 160ms ease;
}

.main-nav .nav-menu > summary::-webkit-details-marker { display: none; }
.main-nav .nav-menu > summary:hover,
.main-nav .nav-menu > summary[aria-current='page'],
.main-nav .nav-menu[open] > summary,
.main-nav .nav-menu:focus-within > summary {
  color: var(--ink);
  background: rgb(18 20 25 / 5%);
}

.nav-chevron {
  display: inline-block;
  color: var(--muted-light);
  font: 700 15px/1 var(--sans);
  transition: transform 160ms ease;
}

.nav-menu[open] .nav-chevron,
.nav-menu:hover .nav-chevron,
.nav-menu:focus-within .nav-chevron { transform: rotate(180deg); }

.site-header .nav-models-panel {
  position: fixed;
  top: 80px;
  left: 50vw;
  width: min(1080px, calc(100vw - 96px));
  padding: 0;
  display: grid;
  grid-template-columns: 1.02fr 1fr 1.08fr;
  gap: 0;
  visibility: hidden;
  opacity: 0;
  transform: translate(-50%, -7px);
  border: 1px solid rgb(18 20 25 / 11%);
  border-radius: 18px;
  background: rgb(251 250 247 / 99%);
  box-shadow: 0 28px 70px rgb(18 20 25 / 16%);
  overflow: hidden;
  transition: opacity 140ms ease, transform 140ms ease, visibility 140ms ease;
}

.site-header .main-nav .nav-menu[open] .nav-models-panel,
.site-header .main-nav .nav-menu:hover .nav-models-panel,
.site-header .main-nav .nav-menu:focus-within .nav-models-panel {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, 0);
}

.nav-models-column { min-width: 0; padding: 22px; }
.nav-models-column + .nav-models-column { border-left: 1px solid rgb(18 20 25 / 9%); }

.nav-panel-label {
  display: block;
  padding: 0;
  margin-bottom: 14px;
  color: #8a929e;
  font: 720 9px/1.2 var(--mono);
  letter-spacing: .12em;
}

.main-nav .nav-models-catalog {
  min-height: 92px;
  padding: 15px 16px;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 16px;
  align-items: center;
  gap: 12px;
  border: 1px solid rgb(36 99 255 / 22%);
  border-radius: 14px;
  background: #f2f6ff;
  color: var(--ink);
}

.main-nav .nav-models-catalog:hover {
  padding: 15px 16px;
  border-color: rgb(36 99 255 / 38%);
  background: #eef3ff;
}

.nav-catalog-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #2463ff;
  color: #fff;
  font-style: normal;
  font-size: 18px;
}

.nav-models-catalog > span,
.nav-models-row > span,
.nav-models-footer > span:nth-child(2) {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.nav-models-catalog strong { font-size: 14px; line-height: 1.25; }
.nav-models-catalog small,
.nav-models-row small,
.nav-models-footer small,
.nav-models-subnav small { color: var(--muted); font-size: 10px; line-height: 1.35; }
.nav-models-catalog > b,
.nav-models-row > b { opacity: .42; transition: opacity 140ms ease, transform 140ms ease; }
.nav-models-catalog:hover > b,
.nav-models-row:hover > b { opacity: 1; transform: translate(2px, -2px); }

.nav-models-subnav { margin-top: 10px; display: grid; }
.main-nav .nav-models-subnav a {
  min-height: 56px;
  padding: 10px 4px;
  display: grid;
  align-content: center;
  gap: 2px;
  border-bottom: 1px solid rgb(18 20 25 / 8%);
  border-radius: 0;
  color: var(--ink);
}
.main-nav .nav-models-subnav a:hover { padding: 10px 4px; color: #174fcf; background: transparent; }
.nav-models-subnav strong { font-size: 12px; line-height: 1.2; }

.nav-models-heading {
  min-height: 23px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.main-nav .nav-models-heading > a { padding: 0; color: #2463ff; font-size: 10px; white-space: nowrap; }
.main-nav .nav-models-heading > a:hover { padding: 0; background: transparent; }

.main-nav .nav-models-row {
  min-height: 66px;
  padding: 10px 4px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 16px;
  align-items: center;
  gap: 11px;
  border-bottom: 1px solid rgb(18 20 25 / 8%);
  border-radius: 0;
  color: var(--ink);
}
.main-nav .nav-models-row:hover { padding: 10px 4px; background: transparent; }
.nav-models-row strong { font-size: 12px; line-height: 1.2; }
.nav-models-row.is-upcoming { grid-template-columns: 38px minmax(0, 1fr) auto; color: rgb(18 20 25 / 56%); }
.nav-models-row.is-upcoming em {
  padding: 4px 6px;
  border-radius: 6px;
  background: rgb(18 20 25 / 6%);
  color: #7c8490;
  font: 740 8px/1 var(--mono);
  font-style: normal;
  letter-spacing: .06em;
}

.nav-models-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid rgb(18 20 25 / 8%);
  border-radius: 11px;
  background: #f1f2f4;
  color: #39414d;
  font: 760 12px/1 var(--mono);
  font-style: normal;
}
.nav-models-mark.is-claude { background: #fff1eb; color: #cf623d; }
.nav-models-mark.is-gemini { background: #edf3ff; color: #1769e8; }
.nav-models-mark.is-gpt { background: #edf8f4; color: #0a8b62; }
.nav-models-mark.is-haiku { background: #f5f0ff; color: #7251c5; }

.main-nav .nav-models-all {
  min-height: 48px;
  padding: 12px 4px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: 0;
  color: var(--ink);
  font-size: 11px;
  font-weight: 700;
}
.main-nav .nav-models-all:hover { padding: 12px 4px 0; color: #174fcf; background: transparent; }

.main-nav .nav-models-footer {
  grid-column: 1 / -1;
  min-height: 62px;
  padding: 12px 22px;
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgb(18 20 25 / 9%);
  border-radius: 0;
  background: #f3f3f0;
  color: var(--ink);
}
.main-nav .nav-models-footer:hover { padding: 12px 22px; background: #efefec; }
.nav-models-footer > i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #28b879;
  box-shadow: 0 0 0 4px rgb(40 184 121 / 11%);
}
.nav-models-footer strong { font-size: 11px; }
.nav-models-footer > span:last-child { color: var(--muted); font-size: 10px; font-weight: 680; }
.nav-models-footer b { color: #2463ff; }

@media (max-width: 1080px) {
  .main-nav .nav-menu > summary { padding-inline: 8px; }
  .site-header .nav-models-panel { width: min(920px, calc(100vw - 56px)); }
  .nav-models-column { padding: 18px; }
  .main-nav .nav-models-footer,
  .main-nav .nav-models-footer:hover { padding-inline: 18px; }
}

@media (max-width: 820px) {
  .site-header .nav-models-panel {
    position: static;
    width: auto;
    margin: 2px 0 8px;
    display: none;
    grid-template-columns: 1fr;
    visibility: visible;
    opacity: 1;
    transform: none;
    box-shadow: none;
  }
  .site-header .main-nav .nav-menu[open] .nav-models-panel { display: grid; transform: none; }
  .main-nav .nav-menu::after,
  .nav-models-subnav,
  .nav-models-popular { display: none; }
  .nav-models-column { padding: 12px; }
  .nav-models-column + .nav-models-column { border-left: 0; border-top: 1px solid rgb(18 20 25 / 9%); }
  .main-nav .nav-models-row { min-height: 58px; }
  .main-nav .nav-models-footer { grid-template-columns: 8px minmax(0, 1fr); padding: 12px; }
  .main-nav .nav-models-footer:hover { padding: 12px; }
  .nav-models-footer > span:last-child { display: none; }
}