/* Platform page refresh (2026-10-23, owner): every /platforms/<slug> page converts and shows the product.
   Shared by the refreshed pages only (they carry <main class="nu-main pr-main">). Prefixes: pr- (page), prh (hero mock).
   Built by the plat/refresh.py kit; SEO text is unchanged: long sections sit in closed <details> rows, never hidden. */

/* ---------- hero copy ---------- */
@media (min-width: 961px) {
  .nu-hero--split .nu-hero__grid:has(.prh) { grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr); gap: clamp(28px, 3.4vw, 56px); }
}
@media (min-width: 1280px) { .nu-hero__grid:has(.prh) .nu-hero__art { margin-right: -40px; } }
.pr-main .pr-hero .nu-crumbs { margin-bottom: 14px; }
.pr-main .pr-hero .nu-eyebrow { font-size: 13.5px; letter-spacing: .02em; }
.pr-main .pr-hero .nu-h1 { margin-top: 12px; font-size: clamp(34px, 3.5vw, 50px); line-height: 1.04; letter-spacing: -0.024em; text-wrap: balance; }
.pr-main .pr-hero .nu-lede { margin-top: 16px; font-size: clamp(16.5px, 1.3vw, 18.5px); line-height: 1.55; max-width: 31em; color: var(--text-2); }
.pr-main .pr-hero .nu-actions { margin-top: 24px; }
@media (min-width: 601px) { .pr-main .pr-hero .nu-actions .btn { min-width: 0; padding-inline: 24px; } }
.pr-trust { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 14px; margin: 18px 0 0; padding: 0; font: 500 12.75px/1.3 var(--sans); color: var(--text-2); }
.pr-trust li { display: inline-flex; align-items: center; gap: 5px; }
.pr-trust svg { width: 14px; height: 14px; flex: none; fill: none; stroke: var(--mint-ink); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.pr-trust a { color: inherit; text-decoration: underline; text-decoration-color: var(--coral-2); text-underline-offset: 3px; }
.pr-cap { margin: 10px 4px 0; text-align: center; font-size: 12px; line-height: 1.4; color: var(--text-3); }
.pr-cap a { color: var(--text-2); text-underline-offset: 2px; }
@media (max-width: 960px) { .pr-main .pr-hero .nu-hero__art { margin-top: 6px; } }
@media (max-width: 600px) {
  .pr-main .pr-hero .nu-h1 { font-size: clamp(30px, 8.4vw, 38px); }
  .pr-main .pr-hero .nu-lede { font-size: 16px; }
  .pr-trust { gap: 6px 14px; font-size: 13px; }
}

/* ---------- hero mock: the app's own browser works a platform-styled assignment. One --T loop, pure CSS. ---------- */
.prh { --T: 18s; --b1: #0f2d4c; --b2: #12425f; --bar-ink: #fff; --bar-sub: #a9c3d8; --ac: #0b6c78; --ac-ink: #fff; --ac-soft: #e8f3f4; --nav: #f3f6f9;
  --ok: #1d6b52; --ok-bg: #e2f6ee; --ok-line: #b9e6d4; --ink: #1b2533; --ink-2: #56606e; --rule: #e3e8ee; --lw: 15cqw;
  --cl: 24%; --ct: 0%; position: relative; width: 100%; min-width: 0; }
.prh--player { --cl: 6%; --ct: 7%; }
.prh__desk { position: relative; padding: clamp(12px, 2vw, 22px) clamp(12px, 2vw, 22px) 80px; border-radius: 26px; background: radial-gradient(120% 90% at 20% 0%, #fff4ec 0%, transparent 60%), linear-gradient(160deg, #fbeee6 0%, #f1ece6 100%); border: 1px solid var(--line); box-shadow: var(--shadow-card); overflow: hidden; }
.prh__win { position: relative; border-radius: 14px; background: #fff; border: 1px solid #ebe5de; box-shadow: 0 30px 56px -28px rgba(60, 30, 20, .38); overflow: hidden; transform-origin: 50% 128%; animation: prhWin var(--T) infinite; }
.prh__bar { display: flex; align-items: center; gap: 10px; padding: 9px 12px; background: #f6f3ef; border-bottom: 1px solid #ebe5de; }
.prh__dots { display: flex; gap: 5px; flex: none; }
.prh__dots i { width: 9px; height: 9px; border-radius: 50%; background: #e3ddd6; }
.prh__dots i:first-child { background: #f08f74; }
.prh__url { position: relative; flex: 1; min-width: 0; height: 24px; display: flex; align-items: center; padding: 0 10px; border-radius: 8px; background: #fff; border: 1px solid #ebe5de; font: 500 11.5px/1 var(--sans); color: #585464; }
.prh__url svg { width: 11px; height: 11px; flex: none; fill: none; stroke: #1d6b52; stroke-width: 2.2; }
.prh__url b { position: absolute; left: 27px; right: 8px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.prh__url b em { font-style: normal; color: #1f1a17; }
.prh__u1 { animation: prhU1 var(--T) infinite; }
.prh__u2 { opacity: 0; animation: prhU2 var(--T) infinite; }
.prh__tag { flex: none; display: inline-flex; align-items: center; gap: 5px; padding: 3px 8px 3px 4px; border-radius: 999px; background: #fdebe3; color: #b4431f; font: 700 10.5px/1.2 var(--sans); white-space: nowrap; }
.prh__tag img { width: 14px; height: 14px; border-radius: 4px; display: block; }

.prh__view { position: relative; aspect-ratio: 16 / 11; background: #fff; overflow: hidden; container-type: inline-size; font-family: var(--sans); color: var(--ink); }
.prh__view p { margin: 0; }
.prh__view sub, .prh__view sup { font-size: 72%; line-height: 0; }
.prh__view sub { vertical-align: -0.28em; }
.prh__load { position: absolute; left: 0; top: 0; height: 3px; width: 0; background: var(--ac); animation: prhLoad var(--T) infinite; z-index: 2; }
.prh__spin { position: absolute; left: 50%; top: 47%; width: 6cqw; height: 6cqw; margin: -3cqw 0 0 -3cqw; border-radius: 50%; border: .6cqw solid #e6ebf0; border-top-color: var(--ac); opacity: 0; animation: prhSpin var(--T) infinite; }
.prh__page { position: absolute; inset: 0; opacity: 0; animation: prhPage var(--T) infinite; }

/* platform header */
.prh__top { position: absolute; left: 0; right: 0; top: 0; height: 14%; display: flex; align-items: center; gap: 2.4cqw; padding: 0 3cqw 0 3.4cqw; background: linear-gradient(100deg, var(--b1) 0%, var(--b2) 100%); color: var(--bar-ink); }
.prh--player .prh__top { height: 13%; }
.prh__logo { flex: none; display: block; width: var(--lw); height: 4.4cqw; background: var(--bar-ink); -webkit-mask: var(--logo) left center / contain no-repeat; mask: var(--logo) left center / contain no-repeat; }
.prh__brand { flex: none; padding-right: 2.4cqw; border-right: 1px solid rgba(255, 255, 255, .22); font: 800 2.3cqw/1 var(--sans); letter-spacing: -.01em; white-space: nowrap; }
.prh__ttl { display: grid; gap: .5cqw; min-width: 0; flex: 1; }
.prh__ttl b { font: 700 2.5cqw/1.1 var(--sans); letter-spacing: -.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.prh__ttl small { font: 500 1.7cqw/1.1 var(--sans); color: var(--bar-sub); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.prh__score { flex: none; display: flex; align-items: center; gap: 1.2cqw; padding: .9cqw 1.1cqw .9cqw 1.6cqw; border-radius: 1.6cqw; background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .16); }
.prh__score small { font: 600 1.55cqw/1 var(--sans); color: var(--bar-sub); text-transform: uppercase; letter-spacing: .08em; }
.prh__score b { display: grid; font: 700 2.3cqw/1 var(--sans); font-variant-numeric: tabular-nums; white-space: nowrap; }
.prh__score i { grid-area: 1 / 1; font-style: normal; padding: .5cqw 1cqw; border-radius: 1cqw; text-align: center; }
.prh__s1 { opacity: 0; animation: prhS1 var(--T) infinite; }
.prh__s0 { animation: prhS0 var(--T) infinite; }
.prh__s2 { opacity: 0; animation: prhS2 var(--T) infinite; }

/* question navigator: a sidebar (Cengage/WebAssign style) or a strip under the header (player style) */
.prh__nav { position: absolute; left: 0; top: 14%; bottom: 0; width: 20%; background: var(--nav); border-right: 1px solid var(--rule); }
.prh__navh { position: absolute; left: 3.4cqw; top: 6%; font: 700 1.4cqw/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); white-space: nowrap; }
.prh__grid { position: absolute; left: 3.4cqw; top: 15%; display: grid; grid-template-columns: repeat(2, 5.4cqw); gap: 1.4cqw; }
.prh__grid i { position: relative; height: 5.4cqw; display: grid; place-items: center; border-radius: 1.1cqw; font: 700 1.9cqw/1 var(--sans); font-style: normal; color: var(--ink-2); background: #fff; border: 1px solid #d7dee6; }
.prh__grid i::after { content: ''; position: absolute; inset: -1px; border-radius: inherit; background: var(--ok-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4L18 8' fill='none' stroke='%231d6b52' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 62% no-repeat; border: 1px solid var(--ok-line); opacity: 0; }
.prh__grid .prh__sq--done::after { opacity: 1; }
.prh__sqa { animation: prhSqA var(--T) infinite; }
.prh__sqa::after { animation: prhSqAOk var(--T) infinite; }
.prh__sqb { animation: prhSqB var(--T) infinite; }
.prh__sqb::after { animation: prhSqBOk var(--T) infinite; }
.prh__prog { position: absolute; left: 3.4cqw; right: 3.4cqw; top: 72%; height: 1cqw; border-radius: 1cqw; background: #dfe6ed; overflow: hidden; }
.prh__prog i { display: block; height: 100%; width: var(--p0, 75%); border-radius: inherit; background: #2f9b77; animation: prhProg var(--T) infinite; }
.prh__due { position: absolute; left: 3.4cqw; right: 1cqw; top: 80%; font: 500 1.4cqw/1.25 var(--sans); color: var(--ink-2); }
.prh--player .prh__nav { top: 13%; bottom: auto; width: auto; right: 0; height: 9%; border-right: 0; border-bottom: 1px solid var(--rule); }
.prh--player .prh__navh { left: 6cqw; top: 50%; transform: translateY(-50%); }
.prh--player .prh__grid { left: auto; right: 3.4cqw; top: 50%; transform: translateY(-50%); grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: 4.2cqw; gap: 1cqw; }
.prh--player .prh__grid i { height: 4.2cqw; font-size: 1.6cqw; border-radius: 50%; }
.prh--player .prh__prog { left: 0; right: 0; top: auto; bottom: -1px; height: .6cqw; border-radius: 0; background: transparent; }

/* the two questions */
.prh__qa, .prh__qb { position: absolute; inset: 0; }
.prh__qa { animation: prhQA var(--T) infinite; }
.prh__qb { opacity: 0; animation: prhQB var(--T) infinite; }
.prh__qn { position: absolute; left: var(--cl); right: 4%; top: calc(19.5% + var(--ct)); display: flex; justify-content: space-between; font: 700 1.5cqw/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--ac); }
.prh__qn em { font-style: normal; color: var(--ink-2); font-weight: 600; }
.prh__qt { position: absolute; left: var(--cl); right: 4%; top: calc(25.5% + var(--ct)); font: 600 2.7cqw/1.3 var(--sans); color: var(--ink); letter-spacing: -.005em; }
.prh__qg { position: absolute; left: var(--cl); right: 4%; top: calc(33% + var(--ct)); font: 500 2cqw/1.3 var(--sans); color: var(--ink-2); }
.prh__row { position: absolute; left: var(--cl); top: calc(42% + var(--ct)); height: 10%; display: flex; align-items: center; gap: 1.4cqw; }
.prh__pre, .prh__unit { font: 600 2.4cqw/1 var(--sans); color: var(--ink-2); white-space: nowrap; }
.prh__pre { width: 6cqw; margin-right: -.4cqw; }
.prh__field { height: 100%; width: 18cqw; display: flex; align-items: center; padding: 0 1.6cqw; border-radius: 1cqw; background: #fff; border: 1px solid #c9d3de; font: 600 2.55cqw/1 var(--sans); font-variant-numeric: tabular-nums; color: var(--ink); white-space: nowrap; overflow: hidden; }
.prh__field--text { width: 44cqw; font-weight: 500; }
.prh__qa .prh__field { animation: prhFieldA var(--T) infinite; }
.prh__qb .prh__field { animation: prhFieldB var(--T) infinite; }
.prh__field i { display: inline-block; font-style: normal; overflow: hidden; max-width: 0; white-space: pre; }
.prh__qa .prh__field i { animation: prhKA var(--T) infinite; animation-delay: calc(var(--i) * var(--ks, .2s)); }
.prh__qb .prh__field i { animation: prhKB var(--T) infinite; animation-delay: calc(var(--i) * var(--ks, .12s)); }
.prh__field u { display: inline-block; width: 1.5px; height: 3cqw; margin-left: 1px; background: var(--ac); opacity: 0; }
.prh__qa .prh__field u { animation: prhCaretA var(--T) infinite; }
.prh__qb .prh__field u { animation: prhCaretB var(--T) infinite; }
.prh__opt { position: absolute; width: 27%; height: 8.5%; display: flex; align-items: center; gap: 1.5cqw; padding: 0 1.6cqw; border-radius: 1.1cqw; background: #fff; border: 1px solid #d7dee6; font: 600 2.25cqw/1 var(--sans); color: var(--ink); white-space: nowrap; overflow: hidden; }
.prh__opt i { flex: none; width: 2.1cqw; height: 2.1cqw; border-radius: 50%; border: 1.5px solid #b7c2cf; background: #fff; }
.prh__opt--0 { left: var(--cl); top: calc(38% + var(--ct)); } .prh__opt--1 { left: calc(var(--cl) + 29%); top: calc(38% + var(--ct)); }
.prh__opt--2 { left: var(--cl); top: calc(49% + var(--ct)); } .prh__opt--3 { left: calc(var(--cl) + 29%); top: calc(49% + var(--ct)); }
.prh--player .prh__opt { width: 28%; } .prh--player .prh__opt--1, .prh--player .prh__opt--3 { left: calc(var(--cl) + 30.5%); }
.prh__qa .prh__opt--pick { animation: prhOptA var(--T) infinite; } .prh__qa .prh__opt--pick i { animation: prhDotA var(--T) infinite; }
.prh__qb .prh__opt--pick { animation: prhOptB var(--T) infinite; } .prh__qb .prh__opt--pick i { animation: prhDotB var(--T) infinite; }

.prh__check { position: absolute; left: var(--cl); top: calc(61% + var(--ct)); min-width: 22%; height: 9.5%; padding: 0 2cqw; display: grid; place-items: center; border-radius: 1.1cqw; border: 1.5px solid var(--ac); color: var(--ac); background: #fff; font: 700 1.95cqw/1 var(--sans); white-space: nowrap; animation: prhCheck var(--T) infinite; }
.prh--player .prh__check { background: var(--ac); color: var(--ac-ink); }
.prh__ok { position: absolute; left: calc(var(--cl) + 24.5%); top: calc(61% + var(--ct)); height: 9.5%; display: flex; align-items: center; gap: .9cqw; padding: 0 1.8cqw 0 1.3cqw; border-radius: 999px; background: var(--ok-bg); border: 1px solid var(--ok-line); color: var(--ok); font: 700 2cqw/1 var(--sans); white-space: nowrap; opacity: 0; }
.prh__ok svg, .prh__big svg { width: 2.4cqw; height: 2.4cqw; fill: none; stroke: currentColor; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.prh__ok--a { animation: prhOkA var(--T) infinite; }
.prh__ok--b { animation: prhOkB var(--T) infinite; }
.prh__pager { position: absolute; left: var(--cl); top: 86%; height: 9.5%; display: flex; align-items: center; font: 600 1.75cqw/1 var(--sans); color: var(--ink-2); white-space: nowrap; }
.prh__submit { position: absolute; right: 3.5%; top: 86%; width: 37%; height: 9.5%; display: grid; place-items: center; border-radius: 1.1cqw; background: var(--ac); color: var(--ac-ink); font: 700 1.95cqw/1 var(--sans); white-space: nowrap; box-shadow: 0 .6cqw 1.4cqw -0.6cqw rgba(15, 30, 50, .45); animation: prhSubmit var(--T) infinite; }
.prh--player .prh__submit { width: 30%; }
.prh__page::before { content: ''; position: absolute; left: 20%; right: 0; top: 81.5%; border-top: 1px solid var(--rule); }
.prh--player .prh__page::before { left: 0; }
.prh--player .prh__page::after { content: ''; position: absolute; left: 0; right: 0; top: 81.5%; bottom: 0; background: #f7f8fa; z-index: -1; }

/* submitted */
.prh__done { position: absolute; left: 20%; right: 0; top: 14%; bottom: 0; display: grid; place-items: center; background: rgba(247, 250, 252, .94); opacity: 0; animation: prhDone var(--T) infinite; }
.prh--player .prh__done { left: 0; top: 13%; }
.prh__card { display: grid; justify-items: center; gap: 1.5cqw; padding: 4cqw 6cqw 3.6cqw; border-radius: 2.4cqw; background: #fff; border: 1px solid var(--rule); box-shadow: 0 2cqw 5cqw -2.4cqw rgba(15, 45, 76, .35); opacity: 0; animation: prhCard var(--T) infinite; }
.prh__big { width: 8.4cqw; height: 8.4cqw; display: grid; place-items: center; border-radius: 50%; background: var(--ok-bg); color: var(--ok); }
.prh__big svg { width: 4.4cqw; height: 4.4cqw; }
.prh__card b { font: 700 3cqw/1.15 var(--sans); color: var(--ink); letter-spacing: -.01em; white-space: nowrap; }
.prh__chip { padding: 1cqw 2.2cqw; border-radius: 999px; background: var(--ok-bg); color: var(--ok); font: 700 2.1cqw/1 var(--sans); white-space: nowrap; }
.prh__card small { font: 500 1.7cqw/1.2 var(--sans); color: var(--ink-2); white-space: nowrap; }

/* cursor: left/top are the arrow tip, in % of the view; targets come from inline --q1x… */
.prh__cur { position: absolute; z-index: 3; left: 72%; top: 118%; width: 4.4cqw; height: 4.4cqw; margin: -0.55cqw 0 0 -0.92cqw; transform-origin: 21% 13%; animation: prhCur var(--T) infinite ease-in-out; }
.prh__cur svg { display: block; width: 100%; height: 100%; fill: #1f1a17; stroke: #fff; stroke-width: 1.4; stroke-linejoin: round; filter: drop-shadow(0 2px 3px rgba(0, 0, 0, .25)); }

/* dock: the app icon the browser grows from, with a live status line */
.prh__dock { position: absolute; left: 50%; bottom: 13px; transform: translateX(-50%); display: flex; align-items: center; gap: 9px; padding: 6px 14px 6px 6px; border-radius: 16px; background: rgba(255, 255, 255, .78); border: 1px solid var(--line); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); box-shadow: 0 10px 24px -16px rgba(60, 30, 20, .4); }
.prh__app { flex: none; width: 40px; height: 40px; border-radius: 11px; overflow: hidden; background: #fff; animation: prhDock var(--T) infinite; }
.prh__app img { width: 100%; height: 100%; display: block; }
.prh__who { display: grid; gap: 3px; min-width: 0; }
.prh__who b { font: 700 12px/1 var(--sans); color: #2a2420; white-space: nowrap; }
.prh__st { display: grid; font: 500 11.5px/1.2 var(--sans); color: #6b6359; }
.prh__st span { grid-area: 1 / 1; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; opacity: 0; }
.prh__st span::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: #e4543c; flex: none; }
.prh__st span:last-child::before { background: #2f9b77; }
.prh__st1 { animation: prhSt1 var(--T) infinite; } .prh__st2 { animation: prhSt2 var(--T) infinite; } .prh__st3 { animation: prhSt3 var(--T) infinite; }
.prh__st4 { animation: prhSt4 var(--T) infinite; } .prh__st5 { animation: prhSt5 var(--T) infinite; } .prh__st6 { animation: prhSt6 var(--T) infinite; }

/* ---- timeline (one loop = var(--T)) ---- */
@keyframes prhWin { 0%, 4% { opacity: 0; transform: translateY(14%) scale(.2); } 10%, 95% { opacity: 1; transform: none; } 100% { opacity: 0; transform: scale(.97); } }
@keyframes prhDock { 0% { transform: none; } 1.5% { transform: translateY(-10px); } 3% { transform: none; } 4.5% { transform: translateY(-5px); } 6%, 100% { transform: none; } }
@keyframes prhU1 { 0%, 13% { opacity: 1; } 14%, 100% { opacity: 0; } }
@keyframes prhU2 { 0%, 13% { opacity: 0; } 14%, 100% { opacity: 1; } }
@keyframes prhLoad { 0%, 9% { width: 0; opacity: 1; } 14% { width: 100%; opacity: 1; } 15%, 100% { width: 100%; opacity: 0; } }
@keyframes prhSpin { 0%, 8% { opacity: 0; transform: rotate(0); } 9% { opacity: 1; } 13% { opacity: 1; transform: rotate(720deg); } 14.5%, 100% { opacity: 0; transform: rotate(800deg); } }
@keyframes prhPage { 0%, 13% { opacity: 0; } 16%, 100% { opacity: 1; } }
@keyframes prhCur {
  0%, 16% { left: 72%; top: 118%; transform: none; }
  21% { left: var(--q1x); top: var(--q1y); transform: none; } 21.8% { transform: scale(.82); } 22.6% { left: var(--q1x); top: var(--q1y); transform: none; }
  30% { left: var(--q1x); top: var(--q1y); }
  33% { left: var(--ckx); top: var(--cky); transform: none; } 33.8% { transform: scale(.82); } 34.6% { left: var(--ckx); top: var(--cky); transform: none; }
  39% { left: var(--ckx); top: var(--cky); }
  45% { left: var(--q2x); top: var(--q2y); transform: none; } 45.8% { transform: scale(.82); } 46.6% { left: var(--q2x); top: var(--q2y); transform: none; }
  48.5% { left: var(--q2x); top: var(--q2y); }
  51.5% { left: var(--ckx); top: var(--cky); transform: none; } 52.3% { transform: scale(.82); } 53.1% { left: var(--ckx); top: var(--cky); transform: none; }
  56% { left: var(--ckx); top: var(--cky); }
  60% { left: var(--sbx); top: var(--sby); transform: none; } 60.8% { transform: scale(.82); } 61.6% { left: var(--sbx); top: var(--sby); transform: none; }
  70% { left: var(--sbx); top: var(--sby); }
  78%, 100% { left: 72%; top: 118%; }
}
@keyframes prhFieldA { 0%, 21.8% { border-color: #c9d3de; box-shadow: none; } 22%, 34.8% { border-color: var(--ac); box-shadow: 0 0 0 .7cqw rgba(30, 60, 90, .1); } 35%, 100% { border-color: #8fd3b8; box-shadow: 0 0 0 .7cqw rgba(47, 155, 119, .12); } }
@keyframes prhFieldB { 0%, 45.8% { border-color: #c9d3de; box-shadow: none; } 46%, 53.2% { border-color: var(--ac); box-shadow: 0 0 0 .7cqw rgba(30, 60, 90, .1); } 53.4%, 100% { border-color: #8fd3b8; box-shadow: 0 0 0 .7cqw rgba(47, 155, 119, .12); } }
@keyframes prhCaretA { 0%, 21.9% { opacity: 0; } 22%, 31% { opacity: 1; } 31.1%, 100% { opacity: 0; } }
@keyframes prhCaretB { 0%, 45.9% { opacity: 0; } 46%, 51% { opacity: 1; } 51.1%, 100% { opacity: 0; } }
@keyframes prhKA { 0%, 22.6% { max-width: 0; } 22.7%, 100% { max-width: 2em; } }
@keyframes prhKB { 0%, 46.3% { max-width: 0; } 46.4%, 100% { max-width: 2em; } }
@keyframes prhCheck { 0%, 33.6% { transform: none; filter: none; } 34%, 34.6% { transform: scale(.96); filter: brightness(.9); } 35%, 51.9% { transform: none; filter: none; } 52.3%, 52.9% { transform: scale(.96); filter: brightness(.9); } 53.3%, 100% { transform: none; filter: none; } }
@keyframes prhOkA { 0%, 34.6% { opacity: 0; transform: translateX(-1.5cqw); } 35.6%, 39% { opacity: 1; transform: none; } 40.5%, 100% { opacity: 0; transform: none; } }
@keyframes prhOkB { 0%, 53% { opacity: 0; transform: translateX(-1.5cqw); } 54%, 100% { opacity: 1; transform: none; } }
@keyframes prhQA { 0%, 39.5% { opacity: 1; transform: none; } 41.5%, 100% { opacity: 0; transform: translateX(-2cqw); } }
@keyframes prhQB { 0%, 40.5% { opacity: 0; transform: translateX(2cqw); } 42.5%, 100% { opacity: 1; transform: none; } }
@keyframes prhOptA { 0%, 21.9% { border-color: #d7dee6; background: #fff; } 22%, 100% { border-color: var(--ac); background: var(--ac-soft); } }
@keyframes prhDotA { 0%, 21.9% { border-color: #b7c2cf; background: #fff; box-shadow: none; } 22%, 100% { border-color: var(--ac); background: var(--ac); box-shadow: inset 0 0 0 .45cqw #fff; } }
@keyframes prhOptB { 0%, 45.9% { border-color: #d7dee6; background: #fff; } 46%, 100% { border-color: var(--ac); background: var(--ac-soft); } }
@keyframes prhDotB { 0%, 45.9% { border-color: #b7c2cf; background: #fff; box-shadow: none; } 46%, 100% { border-color: var(--ac); background: var(--ac); box-shadow: inset 0 0 0 .45cqw #fff; } }
@keyframes prhS0 { 0%, 35.4% { opacity: 1; } 35.5%, 100% { opacity: 0; } }
@keyframes prhS1 { 0%, 35.4% { opacity: 0; } 35.5% { opacity: 1; background: rgba(127, 227, 196, .45); } 40%, 54.4% { opacity: 1; background: transparent; } 54.5%, 100% { opacity: 0; } }
@keyframes prhS2 { 0%, 54.4% { opacity: 0; } 54.5% { opacity: 1; background: rgba(127, 227, 196, .45); } 59%, 100% { opacity: 1; background: transparent; } }
@keyframes prhSqA { 0%, 35.4% { border-color: var(--ac); box-shadow: 0 0 0 .5cqw rgba(30, 60, 90, .14); color: var(--ac); } 35.5%, 100% { border-color: #d7dee6; box-shadow: none; } }
@keyframes prhSqAOk { 0%, 35.4% { opacity: 0; transform: scale(.6); } 36.5%, 100% { opacity: 1; transform: none; } }
@keyframes prhSqB { 0%, 40.5% { border-color: #d7dee6; box-shadow: none; } 41%, 54.4% { border-color: var(--ac); box-shadow: 0 0 0 .5cqw rgba(30, 60, 90, .14); color: var(--ac); } 54.5%, 100% { border-color: #d7dee6; box-shadow: none; } }
@keyframes prhSqBOk { 0%, 54.4% { opacity: 0; transform: scale(.6); } 55.5%, 100% { opacity: 1; transform: none; } }
@keyframes prhProg { 0%, 35.4% { width: var(--p0, 75%); } 37%, 54.4% { width: var(--p1, 87.5%); } 56%, 100% { width: var(--p2, 100%); } }
@keyframes prhSubmit { 0%, 60.4% { transform: none; filter: none; } 60.8%, 61.4% { transform: scale(.96); filter: brightness(.88); } 61.8%, 100% { transform: none; filter: none; } }
@keyframes prhDone { 0%, 61.8% { opacity: 0; } 62.8%, 100% { opacity: 1; } }
@keyframes prhCard { 0%, 62.6% { opacity: 0; transform: translateY(2cqw) scale(.96); } 64.4%, 100% { opacity: 1; transform: none; } }
@keyframes prhSt1 { 0%, 15% { opacity: 1; } 16%, 100% { opacity: 0; } }
@keyframes prhSt2 { 0%, 15.9% { opacity: 0; } 16%, 33.7% { opacity: 1; } 33.8%, 100% { opacity: 0; } }
@keyframes prhSt3 { 0%, 33.7% { opacity: 0; } 33.8%, 40.9% { opacity: 1; } 41%, 100% { opacity: 0; } }
@keyframes prhSt4 { 0%, 40.9% { opacity: 0; } 41%, 60.6% { opacity: 1; } 60.7%, 100% { opacity: 0; } }
@keyframes prhSt5 { 0%, 60.6% { opacity: 0; } 60.7%, 62.7% { opacity: 1; } 62.8%, 100% { opacity: 0; } }
@keyframes prhSt6 { 0%, 62.7% { opacity: 0; } 62.8%, 97% { opacity: 1; } 98%, 100% { opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  .prh *, .prh *::before, .prh *::after { animation: none !important; }
  .prh__u1 { opacity: 0; } .prh__u2 { opacity: 1; }
  .prh__load, .prh__spin { opacity: 0; }
  .prh__page { opacity: 1; }
  .prh__qa .prh__field i { max-width: 2em; }
  .prh__qa .prh__field { border-color: #8fd3b8; box-shadow: 0 0 0 .7cqw rgba(47, 155, 119, .12); }
  .prh__qa .prh__opt--pick { border-color: var(--ac); background: var(--ac-soft); }
  .prh__qa .prh__opt--pick i { border-color: var(--ac); background: var(--ac); box-shadow: inset 0 0 0 .45cqw #fff; }
  .prh__ok--a { opacity: 1; }
  .prh__s0 { opacity: 0; } .prh__s1 { opacity: 1; }
  .prh__grid .prh__sqa::after { opacity: 1; }
  .prh__grid .prh__sqb { border-color: var(--ac); box-shadow: 0 0 0 .5cqw rgba(30, 60, 90, .14); color: var(--ac); }
  .prh__prog i { width: var(--p1, 87.5%); }
  .prh__cur { left: var(--ckx); top: var(--cky); }
  .prh__st .prh__st3 { opacity: 1; }
}
@media (max-width: 420px) {
  .prh__bar { gap: 8px; padding: 8px 10px; }
  .prh__url { padding: 0 8px; font-size: 10.5px; }
  .prh__url b { left: 24px; }
  .prh__tag { font-size: 9.5px; padding: 3px 7px 3px 3px; }
  .prh__tag img { width: 12px; height: 12px; }
  .prh__desk { padding-bottom: 70px; border-radius: 22px; }
  .prh__app { width: 34px; height: 34px; border-radius: 10px; }
  .prh__dock { bottom: 11px; padding: 5px 12px 5px 5px; }
  .prh__who b { font-size: 11.5px; } .prh__st { font-size: 11px; }
}

/* ---------- below the hero ---------- */
.pr-main > .nu-sec:not(.nu-sec--tight):not(.nu-band) { padding-block: clamp(36px, 4.4vw, 64px); }
.pr-main .nu-title { font-size: clamp(26px, 2.5vw, 36px); }
.pr-main .nu-head .nu-lede { font-size: clamp(15.5px, 1.15vw, 17px); }
.pr-proof { padding: clamp(6px, 1vw, 14px) 0 0; }
.pr-stats { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(10px, 1.2vw, 14px); }
.pr-stat { display: flex; flex-direction: column; gap: 5px; min-width: 0; padding: 16px 18px 15px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 1px 2px rgba(60, 50, 40, .05), 0 18px 34px -30px rgba(60, 40, 28, .38); }
.pr-stat strong { font: 400 clamp(26px, 2.4vw, 34px)/1 var(--serif); letter-spacing: -.02em; color: var(--text); }
.pr-stat__lab { font: 600 14px/1.35 var(--sans); color: var(--text); }
.pr-stat__fine { font-size: 12.5px; line-height: 1.4; color: var(--text-3); }
.pr-fine { margin-top: 10px; font-size: 12.5px; line-height: 1.5; color: var(--text-3); }
.pr-fine a { color: var(--text-2); text-underline-offset: 2px; }

.pr-does .pr-tiles { list-style: none; margin: clamp(18px, 2.4vw, 26px) 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(12px, 1.4vw, 16px); }
.pr-tile { display: flex; flex-direction: column; gap: 8px; min-width: 0; padding: clamp(18px, 1.8vw, 24px); border-radius: 20px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 1px 2px rgba(60, 50, 40, .05), 0 18px 34px -30px rgba(60, 40, 28, .38); }
.pr-tile__i { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; background: #fff2ec; border: 1px solid var(--coral-2); color: var(--accent-ink); }
.pr-tile__i svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.pr-tile h3 { margin: 6px 0 0; font: 600 17px/1.3 var(--sans); letter-spacing: -.005em; color: var(--text); }
.pr-tile p { margin: 0; font-size: 14.5px; line-height: 1.55; color: var(--text-2); }

/* recorded runs (the hand #recordings section, kept as is) */
.pr-main #recordings .pl-rec.nu-card { box-shadow: 0 1px 2px rgba(60, 50, 40, .05), 0 18px 34px -30px rgba(60, 40, 28, .38); }
.pr-main #recordings .pl-rec__b > p { font-size: 14.5px; line-height: 1.55; }
.pr-main #recordings .pl-rec__foot .nu-fine { font-size: 12.5px; line-height: 1.45; }
.pr-main #recordings .nu-stage { padding: 0; }

/* the demo button, for pages where the generator adds no hero demo (K-12) */
.pr-main .btn--demo { color: var(--bg); background: var(--text); box-shadow: 0 12px 34px rgba(28, 26, 38, .18), inset 0 1px 0 rgba(255, 255, 255, .14); }
.pr-main .btn--demo:hover { color: var(--bg); background: color-mix(in srgb, var(--text) 86%, var(--bg)); }

/* CTA row */
.pr-cta { padding: clamp(8px, 1.4vw, 16px) 0 clamp(26px, 3.4vw, 44px); }
.pr-cta__box { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 28px; padding: clamp(20px, 2.4vw, 30px) clamp(20px, 2.8vw, 36px); border-radius: 24px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 1px 2px rgba(60, 50, 40, .05), 0 24px 44px -34px rgba(60, 40, 28, .45); }
.pr-cta__t { margin: 0; font: 400 clamp(22px, 2vw, 28px)/1.15 var(--serif); letter-spacing: -.015em; color: var(--text); }
.pr-cta__s { margin: 6px 0 0; font-size: 14.5px; line-height: 1.5; color: var(--text-2); }
.pr-cta .nu-actions { margin: 0; }
@media (max-width: 600px) { .pr-cta .nu-actions { width: 100%; } .pr-cta .nu-actions .btn { flex: 1 1 100%; } }

/* plans */
.pr-plans .pr-planlist { list-style: none; margin: clamp(18px, 2.4vw, 26px) 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.pr-plan { display: flex; flex-direction: column; gap: 6px; padding: 20px; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 1px 2px rgba(60, 50, 40, .05), 0 18px 34px -30px rgba(60, 40, 28, .38); }
.pr-plan--pick { border-color: var(--coral-2); }
.pr-plan__name { font: 600 13px/1.2 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--accent-ink); }
.pr-plan__price { font-size: 14px; color: var(--text-3); }
.pr-plan__price strong { margin-right: 2px; font: 400 34px/1 var(--serif); letter-spacing: -.02em; color: var(--text); }
.pr-plan__list { list-style: none; margin: 10px 0 16px; padding: 0; display: grid; gap: 7px; font-size: 14px; line-height: 1.4; color: var(--text-2); }
.pr-plan__list li { display: flex; align-items: flex-start; gap: 8px; }
.pr-plan__list svg { width: 16px; height: 16px; flex: none; margin-top: 1px; color: var(--mint-ink); }
.pr-plan__list a { color: var(--text-2); text-underline-offset: 2px; }
.pr-plan__btn { width: 100%; margin-top: auto; min-height: 48px; font-size: 15.5px; }
.pr-know { list-style: none; margin: 16px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 13.5px; line-height: 1.45; color: var(--text-2); }
.pr-know li { display: inline-flex; align-items: flex-start; gap: 7px; }
.pr-know li::before { content: ''; width: 5px; height: 5px; margin-top: .5em; border-radius: 50%; background: var(--coral); flex: none; }
.pr-know a { color: var(--text); text-decoration-color: var(--coral-2); text-underline-offset: 3px; }
.pr-nofree { margin-top: 12px; font-size: 14.5px; color: var(--text-2); }
.pr-nofree a { color: var(--text); font-weight: 600; text-decoration-color: var(--coral-2); text-underline-offset: 3px; }
@media (max-width: 760px) {
  .pr-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pr-does .pr-tiles { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .pr-tile { display: grid; grid-template-columns: 38px minmax(0, 1fr); column-gap: 14px; row-gap: 4px; padding: 16px; }
  .pr-tile__i { grid-row: span 2; }
  .pr-tile h3 { margin: 0; }
  .pr-plans .pr-planlist { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .pr-plan { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: baseline; gap: 4px 12px; padding: 15px 16px 16px; }
  .pr-plan__price { justify-self: end; }
  .pr-plan__price strong { font-size: 28px; }
  .pr-plan__list { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 6px 0 10px; font-size: 13.5px; }
  .pr-plan__btn { grid-column: 1 / -1; min-height: 46px; }
}
@media (max-width: 420px) { .pr-stat { padding: 13px 14px; } .pr-stat__fine { font-size: 12px; } }

/* FAQ: closed question rows (the generator writes <details class="nu-acc__item pr-qa"> on refreshed pages) */
.pr-main [data-ss-section="faq"] .nu-acc { gap: 10px; }
.pr-qa { border-radius: 16px; }
.pr-qa__q { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 16px 20px; }
.pr-qa__q::-webkit-details-marker { display: none; }
.pr-qa__q .pl-faq__q { margin: 0; padding: 0; font: 600 16px/1.35 var(--sans); color: var(--text); }
.pr-qa__q:focus-visible { outline: 2px solid var(--coral); outline-offset: 2px; border-radius: 16px; }
.pr-qa__i { position: relative; width: 14px; height: 14px; flex: none; }
.pr-qa__i::before, .pr-qa__i::after { content: ""; position: absolute; left: 0; top: 6px; width: 14px; height: 2px; border-radius: 2px; background: var(--accent-ink); transition: transform .2s; }
.pr-qa__i::after { transform: rotate(90deg); }
.pr-qa[open] .pr-qa__i::after { transform: rotate(0); }
.pr-qa[open] { border-color: var(--coral-2); }
.pr-qa > .nu-acc__a { padding: 0 20px 18px; font-size: 15px; }

/* reference: every long section, whole, in a closed row */
.pr-ref { padding-block: clamp(30px, 4vw, 56px); }
.pr-ref__h { margin: 8px 0 6px; font: 400 clamp(24px, 2.3vw, 32px)/1.1 var(--serif); letter-spacing: -.02em; color: var(--text); }
.pr-ref__sub { margin: 0 0 18px; max-width: 46em; font-size: 14.5px; line-height: 1.55; color: var(--text-2); }
.pr-ref .pl-fresh { margin: 0 0 16px; }
.pr-rows { display: grid; gap: 10px; }
.pr-row { border-radius: 16px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 1px 2px rgba(60, 50, 40, .04); transition: border-color .2s; }
.pr-row:hover { border-color: var(--line-2); }
.pr-row[open] { border-color: var(--coral-2); }
.pr-row__q { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 54px; padding: 12px 20px; cursor: pointer; list-style: none; font: 600 15.5px/1.35 var(--sans); color: var(--text); }
.pr-row__q::-webkit-details-marker { display: none; }
.pr-row__q:focus-visible { outline: 2px solid var(--coral); outline-offset: 2px; border-radius: 16px; }
.pr-row__q small { margin-left: 8px; font-weight: 500; color: var(--text-3); }
.pr-row__q svg { width: 18px; height: 18px; flex: none; fill: none; stroke: var(--accent-ink); stroke-width: 2; stroke-linecap: round; transition: transform .2s; }
.pr-row[open] > .pr-row__q svg { transform: rotate(45deg); }
.pr-row__b { padding: 0 20px 22px; font-size: 15px; line-height: 1.6; color: var(--text-2); }
.pr-row__b > .nu-sec { padding-block: 0; }
.pr-row__b .nu-wrap { padding-inline: 0; max-width: none; }
.pr-row__b .nu-head { grid-template-columns: minmax(0, 1fr); }
.pr-row__b .nu-title, .pr-row__b .pl-answer__card h2, .pr-row__b .pl-qa h2.pl-qa__q { font-size: clamp(20px, 1.8vw, 24px); }
.pr-row__b .pl-answer__card { padding: 0; border: 0; box-shadow: none; background: none; }
.pr-row__b .pl-answer__a { font-size: 15.5px; }
.pr-row__b .nu-lede { font-size: 15px; }
.pr-row__b .pl-sticky { position: static; }
.pr-row__b .nu-split { grid-template-columns: minmax(0, 1fr); gap: 12px; }
.pr-main .pr-row .nu-rise { opacity: 1; transform: none; transition: none; }
.pr-row__lede { margin: 0 0 14px; max-width: 46em; }
@media (max-width: 560px) { .pr-row__q { padding: 12px 16px; font-size: 15px; } .pr-row__b { padding: 0 16px 18px; } .pr-qa__q { padding: 14px 16px; } .pr-qa > .nu-acc__a { padding: 0 16px 16px; } }

/* related tiles and the closing band, a touch tighter */
.pr-main [data-ss-section="platforms"] .pl-related { font-size: 15px; }
.pr-main .nu-band h2 { font-size: clamp(34px, 4.4vw, 60px); }
.pr-main .nu-band .nu-note a { color: inherit; }

/* Answer card under the hero: the page's direct answer, visible without opening a row. */
.ss-short { padding-block: 8px 28px; }
.ss-short__card { max-width: 860px; padding: 22px 26px; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 1px 2px rgba(60, 50, 40, .04); }
.ss-short__q { margin: 0 0 8px; font-family: var(--serif); font-weight: 400; letter-spacing: -0.018em; font-size: clamp(22px, 2vw, 27px); line-height: 1.2; color: var(--text); }
.ss-short__a { margin: 0; max-width: 62em; font-size: 16px; line-height: 1.6; color: var(--text-2); }
.ss-short__more { margin: 10px 0 0; font-size: 14px; }
.ss-short__more a { color: var(--accent-ink); }
@media (max-width: 640px) { .ss-short { padding-block: 4px 20px; } .ss-short__card { padding: 18px; border-radius: 16px; } }