/* SurfEnglish — oceanic liquid-glass design system (matches the iOS app).
   v2: bilingual-reading first. The page is "annotated" the way the app annotates
   text: keyword marks in headings use the same chunk underlines as the demo. */

:root {
  --accent: #4FD2FF;
  --accent2: #B388FF;
  --accent-ink: #06131F;
  --lens: #FF9E64;
  --quote: #FF5C8A;
  --ink: #EAF1FF;
  --ink-soft: rgba(234, 241, 255, .66);
  --ink-faint: rgba(234, 241, 255, .4);
  --hairline: rgba(255, 255, 255, .10);
  --hairline-strong: rgba(255, 255, 255, .16);
  --glass: rgba(255, 255, 255, .06);
  --glass-2: rgba(255, 255, 255, .10);
  --radius: 26px;
  --radius-sm: 16px;
  --grad: linear-gradient(135deg, var(--accent), var(--accent2));
  --a1: #5BE7A9; --a2: #7FD8FF; --b1: #FFC56B; --b2: #FF9F68; --c1: #FF7A9C;
  --ck1: #FF7A9C; --ck2: #5BE7A9; --ck3: #B388FF; --ck4: #FFC56B;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
          Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: #04060D;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Deep-sea backdrop: radial gradient + drifting glow blobs (pure gradients, cheap). */
.bg {
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(1200px 800px at 15% -5%, rgba(43, 212, 255, .16), transparent 60%),
    radial-gradient(1000px 700px at 90% 15%, rgba(122, 92, 255, .14), transparent 60%),
    radial-gradient(900px 700px at 20% 75%, rgba(25, 240, 200, .09), transparent 60%),
    radial-gradient(800px 600px at 85% 95%, rgba(255, 138, 92, .08), transparent 60%),
    radial-gradient(140% 100% at 50% 0%, #122448 0%, #070B18 55%, #04060D 100%);
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; font-weight: 700; text-wrap: balance; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.1; letter-spacing: -.03em; margin-bottom: .45em; }
h3 { font-size: 1.25rem; margin-bottom: .4em; }
p  { color: var(--ink-soft); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

.eyebrow {
  text-transform: uppercase; letter-spacing: .14em; font-size: .78rem;
  font-weight: 700; color: var(--accent); margin-bottom: 14px;
}
:lang(zh-Hans) .eyebrow, :lang(zh-Hant) .eyebrow, :lang(ja) .eyebrow, :lang(ko) .eyebrow,
:lang(th) .eyebrow, :lang(hi) .eyebrow, :lang(ar) .eyebrow { letter-spacing: .08em; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* Keyword mark: a heading "chunk" — same underline device as the demo. */
.kw {
  background: none; color: inherit;
  background-image: linear-gradient(90deg, var(--accent), var(--accent2));
  background-repeat: no-repeat; background-size: 100% .14em; background-position: 0 100%;
  padding-bottom: .06em;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
  text-shadow: 0 0 28px rgba(79, 210, 255, .28);
}

.glass {
  background: var(--glass);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
}

/* ———— header ———— */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 11, 24, .6);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand img { border-radius: 8px; }
.main-nav { display: flex; gap: 22px; margin-inline-start: auto; }
.main-nav a { color: var(--ink-soft); font-size: .92rem; font-weight: 500; }
.main-nav a:hover { color: var(--ink); text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.main-nav + .header-actions { margin-inline-start: 0; }

.lang-switch { position: relative; }
.lang-switch summary {
  list-style: none; cursor: pointer; white-space: nowrap;
  color: var(--ink-soft); font-size: .88rem;
  padding: 6px 12px; border: 1px solid var(--hairline); border-radius: 999px;
}
.lang-switch summary::-webkit-details-marker { display: none; }
.lang-switch summary::after { content: " ▾"; font-size: .7em; }
.lang-menu {
  position: absolute; inset-inline-end: 0; top: calc(100% + 8px);
  display: grid; grid-template-columns: 1fr 1fr; gap: 2px;
  min-width: 320px; padding: 10px;
  background: rgba(13, 20, 40, .95);
  border: 1px solid var(--hairline-strong); border-radius: var(--radius-sm);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
}
.lang-menu a { padding: 8px 12px; border-radius: 10px; color: var(--ink-soft); font-size: .9rem; }
.lang-menu a:hover { background: var(--glass-2); color: var(--ink); text-decoration: none; }
.lang-menu a[aria-current="true"] { color: var(--accent); font-weight: 600; }

.btn {
  display: inline-block; font-weight: 600; color: var(--accent-ink);
  background: var(--grad); border-radius: 999px; padding: 10px 22px;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn-small { padding: 7px 16px; font-size: .88rem; }

/* ———— App Store badge ———— */
.asbadge {
  display: inline-flex; align-items: center; gap: 10px;
  background: #000; color: #fff;
  border: 1px solid rgba(255, 255, 255, .28); border-radius: 12px;
  padding: 8px 18px;
}
.asbadge-apple { width: 26px; height: 26px; }
.asbadge-text { display: flex; flex-direction: column; line-height: 1.15; text-align: start; }
.asbadge-text small { font-size: .66rem; font-weight: 400; }
.asbadge-text strong { font-size: 1.25rem; font-weight: 600; letter-spacing: -.01em; }
.asbadge-link:hover { text-decoration: none; }
.asbadge-link:hover .asbadge { border-color: rgba(255, 255, 255, .5); }

/* ———— hero ———— */
.hero {
  position: relative;
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr);
  align-items: center; gap: 48px;
  padding-top: 64px; padding-bottom: 72px;
  min-height: 80vh;
}
.hero-waves {
  position: absolute; inset: auto -40vw -18% -40vw; height: 62%;
  z-index: 0; pointer-events: none; overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 45%, #000 85%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 45%, #000 85%, transparent);
}
.hero-waves svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-waves svg:first-child path { fill: rgba(44, 110, 156, .26); }
.hero-waves svg:last-child path { fill: rgba(121, 195, 236, .13); }
.hero-copy, .hero-demo { position: relative; z-index: 1; }
.hero-copy { max-width: 640px; }
.hero-copy h1 {
  font-size: clamp(2.35rem, 4.2vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.035em;
}
.hero-copy .lede {
  font-size: clamp(1.08rem, 1.5vw, 1.22rem);
  line-height: 1.65;
  margin: 24px 0 30px;
  max-width: 36em;
  text-wrap: pretty;
}
.cta-row { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.cta-note { font-size: .85rem; color: var(--ink-faint); margin-top: 14px; }
.hero-demo { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.demo-caption { font-size: .8rem; color: var(--ink-faint); text-align: center; max-width: 30em; }

/* ———— phone frames ———— */
.phone {
  width: min(320px, 78vw);
  margin: 0 auto;
  padding: 11px;
  border-radius: 54px;
  background: linear-gradient(160deg, rgba(255,255,255,.16), rgba(255,255,255,.04));
  border: 1px solid var(--hairline-strong);
  box-shadow:
    0 30px 80px -20px rgba(4, 6, 13, .9),
    0 0 120px -30px rgba(79, 210, 255, .25);
}
.phone img { border-radius: 43px; width: 100%; }
.phone-raised { transform: translateY(-24px); }
.phone-tilt-r { transform: rotate(2deg); }
.phone-tilt-l { transform: rotate(-2deg); }

/* ———— live bilingual reading demo: pixel replica of the app's Home feed ————
   iPhone 17 Pro layout, 402×874 pt; every measurement is in points via --pt
   (measured from real simulator screenshots of SurfEnglish 1.3.0). */
.phone-hero { width: min(372px, 92vw); container-type: inline-size; }
.demo-screen {
  --pt: 0.87px; --pt: calc(100cqw / 402);
  --fd-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "PingFang TC",
    "Hiragino Sans", "Apple SD Gothic Neo", "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  position: relative; overflow: hidden; width: 100%; aspect-ratio: 402 / 874;
  border-radius: calc(47 * var(--pt)); background: #000; color: #EAF1FF;
  font-family: var(--fd-font); font-size: calc(15 * var(--pt)); line-height: 1.2;
  -webkit-font-smoothing: antialiased; text-align: start;
}
.demo-screen * { box-sizing: border-box; }
.demo-screen svg { display: block; }
.demo-screen p, .demo-screen h3 { margin: 0; }

/* status bar */
.ios-status { position: absolute; inset: 0 0 auto 0; height: calc(54 * var(--pt)); z-index: 2; }
.ios-time { position: absolute; left: calc(57.5 * var(--pt)); top: calc(22.5 * var(--pt)); font-size: calc(17.5 * var(--pt)); font-weight: 600; letter-spacing: calc(-.2 * var(--pt)); line-height: 1.2; color: #EAF1FF; }
.ios-icons { position: absolute; right: calc(35 * var(--pt)); top: calc(25.7 * var(--pt)); display: flex; align-items: center; gap: calc(6.5 * var(--pt)); height: calc(13.6 * var(--pt)); color: #EAF1FF; }
.ios-icons svg { height: calc(12.8 * var(--pt)); width: auto; }
.ios-icons svg:last-child { height: calc(13.6 * var(--pt)); }

/* header */
.fd-head { position: relative; padding: calc(66 * var(--pt)) calc(18 * var(--pt)) 0 calc(18.5 * var(--pt)); }
.fd-eyebrow { font-size: calc(13 * var(--pt)); font-weight: 600; color: #5E6066; line-height: calc(16 * var(--pt)); padding-inline-end: calc(90 * var(--pt)); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fd-title { font-size: calc(26 * var(--pt)); font-weight: 700; color: #EAF1FF; letter-spacing: calc(-.4 * var(--pt)); line-height: calc(31 * var(--pt)); margin-top: calc(4 * var(--pt)); padding-inline-end: calc(90 * var(--pt)); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fd-sub { font-size: calc(13 * var(--pt)); font-weight: 400; color: #5E6066; line-height: calc(16 * var(--pt)); margin-top: calc(13 * var(--pt)); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fd-head-btns { position: absolute; top: calc(68 * var(--pt)); inset-inline-end: calc(18 * var(--pt)); display: flex; gap: calc(8 * var(--pt)); }
.fd-hbtn { width: calc(35 * var(--pt)); height: calc(35 * var(--pt)); border-radius: calc(10 * var(--pt)); background: #0E0E0E; border: 1px solid #1C1C1C; display: grid; place-items: center; color: #777A81; }
.fd-hbtn svg { width: calc(17 * var(--pt)); height: calc(17 * var(--pt)); }

/* topic tabs — a scrolling chip row in the app: the selected chip sits centered, neighbours fade at the edges */
.fd-tabs {
  margin: calc(17 * var(--pt)) calc(37 * var(--pt)) 0; height: calc(41 * var(--pt)); border-radius: calc(20.5 * var(--pt));
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; column-gap: calc(30 * var(--pt)); overflow: hidden;
  font-size: calc(17 * var(--pt)); font-weight: 600; color: #848D97; padding: 0 calc(6 * var(--pt));
  background:
    radial-gradient(calc(80 * var(--pt)) calc(46 * var(--pt)) at 50% 55%, rgba(79, 210, 255, .22), transparent 70%),
    linear-gradient(90deg, #090E10 0%, #172327 22%, #172327 78%, #090E10 100%);
}
.fd-tabs-side { display: flex; gap: calc(30 * var(--pt)); white-space: nowrap; overflow: hidden; min-width: 0; }
.fd-tabs-side.l { justify-content: flex-end; -webkit-mask-image: linear-gradient(90deg, transparent, #000 30%); mask-image: linear-gradient(90deg, transparent, #000 30%); }
.fd-tabs-side.r { justify-content: flex-start; -webkit-mask-image: linear-gradient(270deg, transparent, #000 30%); mask-image: linear-gradient(270deg, transparent, #000 30%); }
.fd-tabs span { white-space: nowrap; flex: none; }
.fd-tabs .on { color: #4FD2FF; }
.fd-tabs .dim { color: #3A4247; }

/* article card */
.fd-card { position: relative; padding: calc(27.7 * var(--pt)) calc(20 * var(--pt)) 0; }
.fd-card-2 { padding-top: calc(17 * var(--pt)); }
.fd-src { display: flex; align-items: center; gap: calc(6.7 * var(--pt)); height: calc(17.3 * var(--pt)); font-size: calc(13 * var(--pt)); font-weight: 600; color: #9A9FA8; line-height: 1; white-space: nowrap; }
.fd-fav { width: calc(17.3 * var(--pt)); height: calc(17.3 * var(--pt)); border-radius: calc(5 * var(--pt)); flex: none; background: linear-gradient(180deg, #2C6E9C 0 46%, #79C3EC 46% 62%, #CFEEFF 62%); }
.fd-time { font-weight: 400; color: #5E6066; }
.fd-topic { margin-inline-start: auto; display: inline-flex; align-items: center; gap: calc(5 * var(--pt)); height: calc(19.3 * var(--pt)); padding: 0 calc(8.7 * var(--pt)); border-radius: calc(10 * var(--pt)); font-size: calc(13 * var(--pt)); font-weight: 600; }
.fd-topic i { width: calc(6 * var(--pt)); height: calc(6 * var(--pt)); border-radius: 50%; background: currentColor; }
.fd-topic-cities { color: #7FD8FF; background: #131F24; }
.fd-topic-culture { color: #C9A6FF; background: #1E1726; }
.fd-body { display: flex; gap: calc(14 * var(--pt)); margin-top: calc(12.3 * var(--pt)); align-items: flex-start; }
.fd-main { flex: 1 1 auto; min-width: 0; }
.fd-thumb { flex: none; width: calc(78 * var(--pt)); height: calc(78 * var(--pt)); border-radius: calc(14 * var(--pt)); overflow: hidden; }
.fd-thumb svg { width: 100%; height: 100%; }
.fd-headline { font-size: calc(20 * var(--pt)); font-weight: 600; color: #EAF1FF; line-height: calc(25.4 * var(--pt)); letter-spacing: calc(-.2 * var(--pt)); text-wrap: pretty; }
.fd-tr { margin-top: calc(1.6 * var(--pt)); border-inline-start: calc(3 * var(--pt)) solid #CC3355; padding-inline-start: calc(8.7 * var(--pt)); font-size: calc(15 * var(--pt)); line-height: calc(18 * var(--pt)); color: #B7BCC7; }
.fd-tr-body { font-size: calc(13.2 * var(--pt)); line-height: calc(15.5 * var(--pt)); color: #787C83; margin-top: calc(12.7 * var(--pt)); }
.fd-summary { margin-top: calc(12 * var(--pt)); font-size: calc(15 * var(--pt)); line-height: calc(19.1 * var(--pt)); color: #9A9FA8; }
.fd-summary .sen { display: inline; }
.demo-tr-wrap { display: grid; grid-template-rows: 0fr; opacity: 0; transition: grid-template-rows .45s ease, opacity .4s ease; }
.demo-tr-wrap > * { min-height: 0; overflow: hidden; }
.fd-foot { display: flex; align-items: center; margin-top: calc(13.3 * var(--pt)); height: calc(30 * var(--pt)); white-space: nowrap; }
.fd-level { display: inline-flex; align-items: center; gap: calc(4.5 * var(--pt)); height: calc(18.7 * var(--pt)); padding: 0 calc(8 * var(--pt)); border-radius: calc(9.4 * var(--pt)); font-size: calc(13 * var(--pt)); font-weight: 700; }
.fd-level i { width: calc(6 * var(--pt)); height: calc(6 * var(--pt)); border-radius: 50%; background: currentColor; }
.fd-level-b1 { color: #FFC56B; background: #2A2013; }
.fd-level-a2 { color: #7FD8FF; background: #13232A; }
.fd-meta { display: inline-flex; align-items: center; gap: calc(5 * var(--pt)); margin-inline-start: calc(9 * var(--pt)); font-size: calc(13 * var(--pt)); color: #5E6066; overflow: hidden; }
.fd-meta svg { width: calc(13 * var(--pt)); height: calc(13 * var(--pt)); flex: none; }
.fd-btns { margin-inline-start: auto; display: flex; gap: calc(8 * var(--pt)); flex: none; }
.fd-btn { width: calc(30 * var(--pt)); height: calc(30 * var(--pt)); border-radius: calc(9 * var(--pt)); background: #0F0F0F; border: 1px solid #272727; display: grid; place-items: center; color: #67696F; transition: background-color .3s, color .3s, border-color .3s; }
.fd-btn svg { width: calc(18 * var(--pt)); height: calc(18 * var(--pt)); }
.fd-divider { height: 1px; background: #3C3C3F; margin: calc(16 * var(--pt)) calc(20 * var(--pt)) 0; }

/* dock */
.fd-dock {
  position: absolute; left: calc(30 * var(--pt)); top: calc(768 * var(--pt)); width: calc(343.3 * var(--pt)); height: calc(65.3 * var(--pt));
  border-radius: calc(33 * var(--pt)); background: rgba(25, 41, 47, .86); border: 1px solid #223A42;
  backdrop-filter: blur(16px) saturate(140%); -webkit-backdrop-filter: blur(16px) saturate(140%);
  box-shadow: inset 0 1px 0 #2B4E5C, 0 calc(6 * var(--pt)) calc(18 * var(--pt)) rgba(0, 0, 0, .55);
  padding: 0 calc(14 * var(--pt)); display: flex; z-index: 3;
}
.fd-dock-item { position: relative; width: calc(63.3 * var(--pt)); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: calc(2 * var(--pt)); color: #6D7982; }
.fd-dock-item i { display: block; width: calc(26 * var(--pt)); height: calc(26 * var(--pt)); position: relative; z-index: 1; }
.fd-dock-item i svg { width: 100%; height: 100%; }
.fd-dock-item small { position: relative; z-index: 1; font-size: calc(12 * var(--pt)); font-weight: 600; line-height: 1.1; white-space: nowrap; max-width: calc(66 * var(--pt)); overflow: hidden; text-overflow: ellipsis; }
.fd-dock-item.on { color: #4FD2FF; }
.fd-dock-item.on::before { content: ""; position: absolute; left: 50%; top: 50%; width: calc(60 * var(--pt)); height: calc(60 * var(--pt)); border-radius: 50%; background: #265261; transform: translate(-50%, -50%); }
.fd-dock-item.on .fillable { fill: currentColor; }

/* chunk underlines + looked-up word (same colors as the app) */
.demo-screen .ck { background-image: linear-gradient(var(--ckc), var(--ckc)); background-repeat: no-repeat; background-size: 0% calc(1.4 * var(--pt)); background-position: 0 100%; padding-bottom: calc(1 * var(--pt)); transition: background-size .5s ease, background-color .3s ease; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.demo-screen .ck-1 { --ckc: #F38EB1; } .demo-screen .ck-2 { --ckc: #73C86B; } .demo-screen .ck-3 { --ckc: #A98BEA; } .demo-screen .ck-4 { --ckc: #F0A05A; }
.demo-screen .wd { position: relative; border-radius: calc(3 * var(--pt)); transition: background-color .3s ease, color .3s ease; }

/* lookup / chunk popovers — the app's capsule style */
.fd-pop {
  position: absolute; z-index: 4; left: var(--px, 20px); top: calc(var(--py, 0px) - 46 * var(--pt));
  height: calc(39.3 * var(--pt)); padding-inline: calc(4.6 * var(--pt)) calc(14 * var(--pt)); border-radius: calc(20 * var(--pt));
  background: #2A384D; display: inline-flex; align-items: center; gap: calc(9 * var(--pt)); white-space: nowrap;
  box-shadow: 0 calc(8 * var(--pt)) calc(24 * var(--pt)) rgba(0, 0, 0, .55);
  opacity: 0; transform: translateY(calc(4 * var(--pt))) scale(.96); transform-origin: 30% 100%;
  transition: opacity .25s ease, transform .3s cubic-bezier(.2, .9, .3, 1.15); pointer-events: none;
}
.fd-pop-spk { width: calc(30 * var(--pt)); height: calc(30 * var(--pt)); border-radius: 50%; background: #445062; color: #9FD3FF; display: grid; place-items: center; flex: none; }
.fd-pop-spk svg { width: calc(17 * var(--pt)); height: calc(17 * var(--pt)); }
.fd-pop-text { font-size: calc(17 * var(--pt)); font-weight: 600; color: #FFFFFF; max-width: calc(236 * var(--pt)); overflow: hidden; text-overflow: ellipsis; }
.fd-pop-more { font-size: calc(15 * var(--pt)); font-weight: 600; color: #5B9EFF; }

/* website-only cues (drawn above the app UI) */
.demo-hand { position: absolute; left: calc(20 * var(--pt)); top: var(--sy, 50%); margin-top: calc(-2 * var(--pt)); width: calc(24 * var(--pt)); height: calc(24 * var(--pt)); border-radius: 50%; background: rgba(255, 255, 255, .9); box-shadow: 0 0 0 calc(7 * var(--pt)) rgba(255, 255, 255, .18), 0 calc(6 * var(--pt)) calc(18 * var(--pt)) rgba(0, 0, 0, .5); opacity: 0; pointer-events: none; z-index: 5; }
.demo-hand .demo-hint { position: absolute; left: calc(32 * var(--pt)); top: calc(-1 * var(--pt)); }
.demo-hint { display: inline-block; padding: calc(3 * var(--pt)) calc(9 * var(--pt)); border-radius: calc(12 * var(--pt)); font-size: calc(11 * var(--pt)); font-weight: 700; color: var(--accent); background: rgba(13, 20, 40, .96); border: 1px solid rgba(79, 210, 255, .4); box-shadow: 0 calc(6 * var(--pt)) calc(18 * var(--pt)) rgba(0, 0, 0, .45); opacity: 0; transition: opacity .3s ease; z-index: 5; white-space: nowrap; }
.demo-hint-chunks, .demo-hint-lookup { position: absolute; top: calc(4 * var(--pt)); inset-inline-end: calc(20 * var(--pt)); }
.demo-hint-chunks { color: #73C86B; border-color: rgba(115, 200, 107, .45); }
.demo-hint-lookup { color: #FFC56B; border-color: rgba(255, 197, 107, .45); }

/* states */
.demo.is-static .demo-tr-wrap, .demo.is-translated .demo-tr-wrap { grid-template-rows: 1fr; opacity: 1; }
.demo.is-static .fd-btn-translate, .demo.is-translated .fd-btn-translate,
.demo.is-static .fd-btn-chunks, .demo.is-chunked .fd-btn-chunks { background: #0C2026; border-color: #163B47; color: #4FD2FF; }
.demo.is-static .ck, .demo.is-chunked .ck { background-size: 100% calc(1.4 * var(--pt)); }
.demo.is-bubble .fd-pop-chunk { opacity: 1; transform: none; }
.demo.is-bubble .ck-2 { background-color: rgba(115, 200, 107, .2); }
.demo.is-lookup .wd { background-color: rgba(79, 210, 255, .26); color: #EAF1FF; }
.demo.is-lookup .fd-pop-word { opacity: 1; transform: none; }
.demo.is-lookup .demo-hint-lookup { opacity: 1; }
.demo.is-chunked:not(.is-bubble):not(.is-lookup) .demo-hint-chunks { opacity: 1; }
.demo.is-swiping .demo-hand { animation: demo-swipe 1.1s cubic-bezier(.3, .7, .3, 1) forwards; }
.demo.is-swiping .demo-hand .demo-hint { opacity: 1; }
.demo.is-swiping .sen-2 { animation: demo-nudge 1.1s ease forwards; }
.demo.is-lookup .wd::before, .demo.is-lookup .wd::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: calc(12 * var(--pt)); height: calc(12 * var(--pt)); border-radius: 50%;
  border: 2px solid #FFC56B; transform: translate(-50%, -50%); opacity: 0; animation: demo-ripple .9s ease-out 1; pointer-events: none;
}
.demo.is-lookup .wd::after { animation-delay: .22s; }
@keyframes demo-swipe { 0% { opacity: 0; transform: translateX(0); } 15% { opacity: 1; } 85% { opacity: 1; transform: translateX(calc(120 * var(--pt))); } 100% { opacity: 0; transform: translateX(calc(126 * var(--pt))); } }
@keyframes demo-nudge { 0%, 15% { transform: translateX(0); } 55% { transform: translateX(calc(8 * var(--pt))); } 100% { transform: translateX(0); } }
@keyframes demo-ripple { 0% { opacity: .9; width: calc(10 * var(--pt)); height: calc(10 * var(--pt)); } 100% { opacity: 0; width: calc(44 * var(--pt)); height: calc(44 * var(--pt)); } }
.demo-langs { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.demo-langs span { padding: 3px 10px; border-radius: 999px; font-size: .78rem; color: var(--ink-faint); border: 1px solid var(--hairline); transition: color .3s ease, border-color .3s ease; }
.demo-langs span.on { color: var(--accent); border-color: rgba(79, 210, 255, .5); }

/* ———— sections ———— */
.section { padding: 110px 24px; }
.section-tight { padding-top: 0; }
.section-narrow { max-width: 820px; }
.section-lede { max-width: 42em; margin-bottom: 44px; font-size: 1.08rem; text-wrap: pretty; }

.loop-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.loop-card { padding: 28px; }
.loop-num {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--grad); color: var(--accent-ink);
  font-weight: 700; margin-bottom: 14px;
}

/* gesture rows */
.gesture-row {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  align-items: center; gap: 56px;
  padding: 64px 0; border-top: 1px solid var(--hairline);
}
.gesture-row-flip .gesture-copy { order: 2; }
.kicker { display: flex; align-items: center; gap: 12px; color: var(--accent); font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 14px; }
.gesture-glyph { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; background: rgba(79, 210, 255, .1); border: 1px solid rgba(79, 210, 255, .25); color: var(--accent); }
.gesture-glyph svg { width: 26px; height: 26px; }
.gesture-glyph-chunks { color: var(--ck2); background: rgba(91, 231, 169, .1); border-color: rgba(91, 231, 169, .3); }
.gesture-glyph-lookup { color: var(--b1); background: rgba(255, 197, 107, .1); border-color: rgba(255, 197, 107, .3); }
.gesture-copy h3 { font-size: clamp(1.5rem, 2.6vw, 2.05rem); letter-spacing: -.025em; margin-bottom: 14px; }
.gesture-copy > p { max-width: 32em; font-size: 1.02rem; }

.feature-row {
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: 48px;
}
.feature-row-flip .feature-copy { order: 2; }
.feature-copy h3 { font-size: clamp(1.35rem, 2.4vw, 1.7rem); }
.feature-copy > p { max-width: 32em; }
.feature-copy h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }

.cefr-chips { display: flex; gap: 8px; margin-top: 18px; }
.chip {
  display: inline-block; padding: 5px 13px; border-radius: 999px;
  font-size: .82rem; font-weight: 600;
  background: var(--glass-2); border: 1px solid var(--hairline);
  color: var(--ink-soft);
}
.chip-a1 { color: var(--a1); border-color: color-mix(in srgb, var(--a1) 40%, transparent); }
.chip-a2 { color: var(--a2); border-color: color-mix(in srgb, var(--a2) 40%, transparent); }
.chip-b1 { color: var(--b1); border-color: color-mix(in srgb, var(--b1) 40%, transparent); }
.chip-b2 { color: var(--b2); border-color: color-mix(in srgb, var(--b2) 40%, transparent); }
.chip-c1 { color: var(--c1); border-color: color-mix(in srgb, var(--c1) 40%, transparent); }
.chip-accent { color: var(--accent-ink); background: var(--grad); border: none; }
.chip-dim { color: var(--ink-faint); }

.badge {
  font-size: .74rem; font-weight: 700; white-space: nowrap;
  color: var(--accent); background: rgba(79, 210, 255, .12);
  padding: 4px 12px; border-radius: 999px;
}
.badge-new { background: var(--grad); color: var(--accent-ink); margin-inline-start: 8px; vertical-align: middle; letter-spacing: .02em; text-transform: none; }

/* compare panel: translator app vs. bilingual reading */
.compare { display: grid; grid-template-columns: 1fr 1fr; overflow: hidden; margin-bottom: 48px; padding: 0; }
.compare-col { padding: 30px 32px; }
.compare-bad { background: rgba(255, 255, 255, .02); border-inline-end: 1px solid var(--hairline); }
.compare-good { background: linear-gradient(135deg, rgba(79, 210, 255, .09), rgba(179, 136, 255, .06)); }
.compare-label { font-size: .76rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 16px; }
.compare-good .compare-label { color: var(--accent); }
.compare-orig { font-size: 1.08rem; line-height: 1.55; color: var(--ink); text-wrap: pretty; }
.compare-gone { text-decoration: line-through; opacity: .3; }
.compare-good .ck { background-size: 100% 2px; }
.compare-good .wd { background: rgba(255, 197, 107, .25); }
.compare-tr { border-inline-start: 2px solid var(--quote); padding-inline-start: 10px; margin-top: 10px; color: var(--ink-soft); line-height: 1.55; }
.compare-bad .compare-tr { color: var(--ink-faint); }
.bilingual-copy { max-width: 760px; }

.check-list { list-style: none; margin-top: 20px; }
.check-list li { position: relative; padding-inline-start: 30px; margin-bottom: 12px; color: var(--ink-soft); }
.check-list li::before { content: "✓"; position: absolute; inset-inline-start: 0; color: var(--accent); font-weight: 700; }
.phone-pair { display: flex; gap: 20px; justify-content: center; }
.phone-pair .phone { width: min(230px, 44vw); }

.release { padding: 26px 30px; margin-top: 44px; }
.release h3 { display: flex; align-items: center; gap: 10px; font-size: 1.05rem; margin: 0; }
.release h3 .badge-new { margin: 0; }
.release ul { list-style: none; margin-top: 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 28px; }
.release li { position: relative; padding-inline-start: 18px; color: var(--ink-soft); font-size: .94rem; }
.release li::before { content: ""; position: absolute; inset-inline-start: 0; top: .62em; width: 7px; height: 7px; border-radius: 50%; background: var(--grad); }

/* voice */
.voice-panel { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 40px; align-items: center; padding: 44px; }
.voice-panel h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.voice-chips { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.voice-wave { display: flex; gap: 5px; align-items: center; height: 110px; padding-inline: 8px; }
.voice-wave i { display: block; width: 5px; height: 84px; border-radius: 3px; background: var(--grad); transform-origin: center; transform: scaleY(.35); animation: voice 1.7s ease-in-out infinite; animation-delay: calc(var(--i) * -.11s); opacity: .9; }
@keyframes voice { 0%, 100% { transform: scaleY(.22); } 50% { transform: scaleY(1); } }

/* games */
.games-phones { display: flex; justify-content: center; gap: 28px; margin: 48px 0; flex-wrap: wrap; }
.games-phones .phone { width: min(270px, 72vw); }
.games-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.game-card { padding: 26px; }
.game-library { grid-column: 1 / -1; background: linear-gradient(135deg, rgba(79, 210, 255, .08), rgba(179, 136, 255, .05)); }
.game-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.game-soon { opacity: .55; }
.game-soon .badge { color: var(--ink-faint); background: var(--glass-2); }

/* languages */
.langs { padding: 36px; }
.langs h4 { margin: 18px 0 12px; color: var(--ink-faint); font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; }
.langs h4:first-child { margin-top: 0; }
.lang-chip-grid { display: flex; flex-wrap: wrap; gap: 10px; }

/* plus */
.plus-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 780px; }
.plus-card { padding: 30px; }
.plus-card ul { list-style: none; margin-top: 14px; }
.plus-card li { padding: 7px 0; color: var(--ink-soft); border-bottom: 1px solid var(--hairline); }
.plus-card li:last-child { border-bottom: none; }
.plus-featured { border-color: color-mix(in srgb, var(--accent) 45%, transparent); box-shadow: 0 0 80px -30px rgba(79, 210, 255, .5); }

.privacy-link { margin-top: 28px; font-weight: 600; }

/* faq */
.faq-list details { margin-bottom: 12px; padding: 0; overflow: hidden; }
.faq-list summary { cursor: pointer; list-style: none; font-weight: 600; padding: 20px 52px 20px 24px; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; inset-inline-end: 22px; top: 16px; font-size: 1.4rem; color: var(--accent); font-weight: 400; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { padding: 0 24px 20px; }
[dir="rtl"] .faq-list summary { padding: 20px 24px 20px 52px; }

/* final cta */
.final-cta { text-align: center; padding-bottom: 140px; }
.final-cta .section-lede { margin: 12px auto 32px; }

/* ———— footer ———— */
.site-footer { border-top: 1px solid var(--hairline); background: rgba(4, 6, 13, .6); padding: 56px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.6fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { margin-top: 10px; color: var(--ink-faint); }
.site-footer h4 { font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-faint); margin-bottom: 14px; }
.site-footer a { display: block; color: var(--ink-soft); padding: 4px 0; font-size: .92rem; }
.site-footer a:hover { color: var(--ink); }
.footer-langs .lang-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px 16px; }
.footer-legal { border-top: 1px solid var(--hairline); padding-top: 24px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-legal p { font-size: .8rem; color: var(--ink-faint); }

/* ———— legal / support pages ———— */
.page-legal main { padding-top: 40px; }
.legal-content { max-width: 760px; margin: 0 auto; padding: 40px 24px 100px; }
.legal-content h1 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 8px; }
.legal-updated { color: var(--ink-faint); font-size: .9rem; margin-bottom: 40px; }
.legal-content h2 { font-size: 1.4rem; margin: 44px 0 14px; }
.legal-content h3 { font-size: 1.05rem; margin: 26px 0 8px; }
.legal-content p, .legal-content li { color: var(--ink-soft); margin-bottom: 12px; }
.legal-content ul { padding-inline-start: 22px; }
.legal-content .glass { padding: 24px; margin: 20px 0; }
.legal-content table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: .92rem; }
.legal-content th, .legal-content td { text-align: start; padding: 10px 14px; border: 1px solid var(--hairline); color: var(--ink-soft); }
.legal-content th { color: var(--ink); background: var(--glass); }

/* ———— editorial / entity pages ———— */
.page-article main { padding-top: 36px; }
.article-content { max-width: 860px; margin: 0 auto; padding: 36px 24px 120px; }
.article-content h1 { font-size: clamp(2.25rem, 5.6vw, 3.8rem); max-width: 14em; margin-bottom: 20px; }
.article-content h2 { font-size: clamp(1.55rem, 3vw, 2rem); margin: 64px 0 18px; }
.article-content h3 { font-size: 1.15rem; }
.article-content p, .article-content li { color: var(--ink-soft); }
.article-content p { margin-bottom: 18px; }
.article-content ul { padding-inline-start: 22px; }
.article-content li { margin-bottom: 10px; }
.article-lede { font-size: clamp(1.08rem, 2vw, 1.25rem); line-height: 1.72; max-width: 44em; }
.article-lede strong { color: var(--ink); }
.article-byline, .article-updated { color: var(--ink-faint) !important; font-size: .9rem; }
.article-updated { margin-top: 56px; }
.article-actions { margin: 30px 0 50px; }
.breadcrumbs { display: flex; gap: 9px; align-items: center; margin-bottom: 48px; color: var(--ink-faint); font-size: .88rem; }
.breadcrumbs a { color: var(--ink-soft); }
.article-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.article-card-grid.two-column { grid-template-columns: repeat(2, 1fr); }
.article-card-grid > .glass { padding: 24px; }
.article-card-grid > .glass p:last-child { margin-bottom: 0; }
.table-wrap { overflow-x: auto; border: 1px solid var(--hairline); border-radius: var(--radius-sm); }
.article-content table { width: 100%; border-collapse: collapse; font-size: .94rem; }
.article-content th, .article-content td { padding: 13px 16px; text-align: start; border-bottom: 1px solid var(--hairline); }
.article-content tr:last-child th, .article-content tr:last-child td { border-bottom: 0; }
.article-content th { color: var(--ink); width: 32%; background: var(--glass); }
.article-content td { color: var(--ink-soft); }
.official-links { margin-top: 12px; }
.routine-list { list-style: none; padding: 0 !important; counter-reset: routine; }
.routine-list li { counter-increment: routine; position: relative; padding: 0 0 24px 52px; margin: 0; }
.routine-list li::before { content: counter(routine); position: absolute; inset-inline-start: 0; top: 0; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--grad); color: var(--accent-ink); font-weight: 700; }
.routine-list strong { display: block; color: var(--ink); margin-bottom: 4px; }
.routine-list span { display: block; }
.article-media { max-width: 420px; margin: 44px auto; padding: 16px; }
.article-media img { max-height: 680px; width: auto; margin: 0 auto; border-radius: 22px; }
.article-media figcaption { color: var(--ink-faint); font-size: .86rem; padding: 14px 4px 2px; }
.article-media-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 42px 0; }
.article-media-pair .article-media { margin: 0; }
.article-cta { margin-top: 72px; padding: 34px; text-align: center; }
.article-cta h2 { margin-top: 0; }
.article-cta p { max-width: 38em; margin: 0 auto 24px; }
.article-compare { margin: 36px 0 12px; }

/* ———— reveal animation ———— */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .voice-wave i { animation: none; transform: scaleY(.55); }
  .demo .demo-hand, .demo .demo-hint { display: none; }
}

/* ———— responsive ———— */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 48px; min-height: 0; gap: 40px; }
  .hero-copy { max-width: 720px; margin-inline: auto; }
  .hero-copy .lede { margin-inline: auto; }
  .cta-row { justify-content: center; }
  .hero-demo { text-align: start; }
  .gesture-row { grid-template-columns: 1fr; gap: 32px; padding: 48px 0; }
  .gesture-row-flip .gesture-copy { order: 0; }
  .feature-row { grid-template-columns: 1fr; gap: 32px; }
  .feature-row-flip .feature-copy { order: 0; }
  .compare { grid-template-columns: 1fr; }
  .compare-bad { border-inline-end: 0; border-bottom: 1px solid var(--hairline); }
  .voice-panel { grid-template-columns: 1fr; padding: 32px; }
  .voice-wave { height: 70px; justify-content: center; }
  .voice-wave i { height: 54px; }
  .release ul { grid-template-columns: 1fr; }
  .loop-grid { grid-template-columns: 1fr; }
  .games-grid { grid-template-columns: 1fr; }
  .plus-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .phone-raised, .phone-tilt-r, .phone-tilt-l { transform: none; }
  .lang-menu { position: fixed; inset-inline: 16px; top: 70px; min-width: 0; }
  .article-card-grid { grid-template-columns: 1fr; }
  .section { padding: 80px 24px; }
}

@media (max-width: 560px) {
  .header-inner { gap: 10px; }
  .brand span { display: none; }
  .lang-switch summary { padding: 6px 10px; font-size: .84rem; }
  .hero-copy h1 { font-size: clamp(2rem, 8.6vw, 2.5rem); }
  .hero-copy .lede { font-size: 1.02rem; }
  .phone-hero { width: min(372px, 92vw); }
  .compare-col { padding: 22px 20px; }
  .article-content { padding-inline: 20px; }
  .article-content h1 { font-size: 2.25rem; }
  .article-card-grid.two-column, .article-media-pair { grid-template-columns: 1fr; }
  .article-content th, .article-content td { display: block; width: 100%; }
  .article-content th { padding-bottom: 4px; border-bottom: 0; }
  .article-content td { padding-top: 4px; }
  .phone-pair { gap: 12px; }
  .phone-pair .phone { width: min(200px, 45vw); }
}