:root {
  color-scheme: dark;
  --ink: #f4f7fb;
  --muted: #9ba9bc;
  --muted-strong: #c5ceda;
  --bg: #080c12;
  --panel: #0d131c;
  --panel-2: #111a26;
  --line: #233044;
  --blue: #1682ff;
  --blue-light: #67afff;
  --red: #e95650;
  --green: #47c78a;
  --white-light: #f4f7fb;
  --radius: 20px;
  --shadow: 0 28px 90px rgba(0, 0, 0, .4);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
.shell { width: min(1100px, calc(100% - 40px)); margin-inline: auto; }
.skip-link {
  position: fixed; z-index: 100; top: 10px; left: 10px; padding: 10px 14px;
  background: var(--ink); color: var(--bg); border-radius: 8px; transform: translateY(-150%);
}
.skip-link:focus { transform: none; }
:focus-visible { outline: 3px solid var(--blue-light); outline-offset: 4px; border-radius: 4px; }

.site-header { position: relative; z-index: 10; border-bottom: 1px solid rgba(255,255,255,.06); }
.nav { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 760; letter-spacing: -.02em; }
.brand-mark { display: flex; align-items: center; gap: 5px; }
.brand-mark i { width: 8px; height: 8px; border-radius: 50%; display: block; }
.brand-mark i:nth-child(1) { background: var(--red); box-shadow: 0 0 12px rgba(233,86,80,.5); }
.brand-mark i:nth-child(2) { background: var(--white-light); box-shadow: 0 0 12px rgba(255,255,255,.35); }
.brand-mark i:nth-child(3) { background: var(--green); box-shadow: 0 0 12px rgba(71,199,138,.5); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--muted-strong); text-decoration: none; font-size: .92rem; font-weight: 600; }
.nav-links a:hover { color: var(--ink); }

.hero { position: relative; overflow: hidden; padding: 92px 0 106px; }
.hero::before {
  content: ""; position: absolute; width: 650px; height: 650px; top: -320px; right: -150px;
  background: radial-gradient(circle, rgba(22,130,255,.13), transparent 68%); pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 76px; align-items: center; }
.eyebrow { margin: 0 0 18px; color: var(--blue-light); text-transform: uppercase; font-size: .76rem; font-weight: 800; letter-spacing: .18em; }
h1, h2, h3 { margin-top: 0; line-height: 1.08; letter-spacing: -.035em; }
h1 { font-size: clamp(3.25rem, 7vw, 5.7rem); margin-bottom: 20px; }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); margin-bottom: 20px; }
h3 { font-size: 1.3rem; margin-bottom: 10px; }
.hero-copy { margin: 0 0 30px; color: var(--muted-strong); font-size: clamp(1.12rem, 2vw, 1.35rem); max-width: 590px; }
.store-row { display: flex; flex-wrap: wrap; gap: 12px; }
.store-badge {
  min-width: 176px; padding: 10px 17px; display: flex; gap: 11px; align-items: center;
  border: 1px solid #3a4656; background: #05070a; border-radius: 11px; text-decoration: none;
  transition: border-color .2s ease, transform .2s ease;
}
.store-badge:hover { border-color: #718096; transform: translateY(-2px); }
.store-badge svg { width: 27px; height: 27px; flex: none; }
.store-badge small, .store-badge strong { display: block; line-height: 1.15; }
.store-badge small { font-size: .62rem; color: #cad2dc; text-transform: uppercase; letter-spacing: .04em; }
.store-badge strong { font-size: 1.05rem; margin-top: 3px; }
.soon { margin: 12px 0 0; color: #75859a; font-size: .78rem; }

.card-scene { position: relative; padding: 18px 0 22px; }
.card-glow { position: absolute; inset: 15% 10%; background: rgba(22,130,255,.17); filter: blur(70px); }
.flashcard {
  position: relative; min-height: 490px; border: 1px solid #28384d; border-radius: 30px;
  background: linear-gradient(155deg, #101823, #090d13 70%); box-shadow: var(--shadow); overflow: hidden;
}
.flashcard-top { padding: 25px 27px; display: flex; justify-content: space-between; color: #8391a4; font-size: .68rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.scene { height: 282px; position: relative; }
.light { position: absolute; width: 15px; height: 15px; border-radius: 50%; }
.light::after { content: attr(data-label); position: absolute; left: 50%; top: 25px; transform: translateX(-50%); color: #aeb9c7; font-size: .58rem; font-weight: 800; }
.light.white { top: 28px; left: calc(50% - 7px); background: var(--white-light); box-shadow: 0 0 10px #fff, 0 0 28px rgba(255,255,255,.46); }
.light.red { top: 92px; left: 31%; background: var(--red); box-shadow: 0 0 11px var(--red), 0 0 30px rgba(233,86,80,.56); }
.light.green { top: 92px; right: 31%; background: var(--green); box-shadow: 0 0 11px var(--green), 0 0 30px rgba(71,199,138,.55); }
.vessel { position: absolute; width: 210px; height: 112px; left: 50%; bottom: 5px; transform: translateX(-50%); }
.vessel::before { content: ""; position: absolute; left: 23px; right: 23px; top: 0; height: 48px; border: 1.5px solid #526177; transform: perspective(80px) rotateX(15deg); }
.vessel::after { content: ""; position: absolute; left: 0; right: 0; top: 48px; height: 62px; background: linear-gradient(150deg, transparent 49.4%, #526177 50%, transparent 50.6%), linear-gradient(210deg, transparent 49.4%, #526177 50%, transparent 50.6%); background-size: 50% 100%; background-position: left, right; background-repeat: no-repeat; border-top: 1.5px solid #526177; }
.flashcard-question { border-top: 1px solid #1e2a3a; padding: 25px 27px; text-align: center; }
.flashcard-question strong { display: block; font-size: 1.08rem; }
.flashcard-question span { color: var(--muted); font-size: .82rem; }
.rule-pill { position: absolute; right: -17px; bottom: 3px; padding: 9px 14px; background: #172337; border: 1px solid #34527b; border-radius: 10px; color: #b9d8ff; font-size: .76rem; font-weight: 750; transform: rotate(-2deg); box-shadow: 0 15px 30px rgba(0,0,0,.28); }

.section { padding: 105px 0; }
.section-border { border-top: 1px solid rgba(255,255,255,.07); }
.section-intro { max-width: 680px; margin-bottom: 52px; }
.section-intro p, .feature-copy p, .price-copy p { color: var(--muted); font-size: 1.06rem; }
.feature { display: grid; grid-template-columns: .95fr 1.05fr; gap: 90px; align-items: center; }
.feature + .feature { margin-top: 120px; }
.feature.reverse .feature-copy { order: 2; }
.feature.reverse .feature-visual { order: 1; }
.check-list { list-style: none; padding: 0; margin: 25px 0 0; display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 26px; color: var(--muted-strong); }
.check-list li::before { content: ""; position: absolute; left: 1px; top: .65em; width: 8px; height: 8px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 12px rgba(22,130,255,.55); }
.visual-panel { min-height: 360px; padding: 32px; display: flex; flex-direction: column; justify-content: center; background: linear-gradient(145deg, #111a26, #0c121b); border: 1px solid var(--line); border-radius: var(--radius); }
.answer-demo { gap: 12px; }
.answer-option { padding: 15px 17px; border: 1px solid #28364a; background: #0b1119; border-radius: 12px; color: #abb7c7; font-size: .9rem; }
.answer-option.correct { border-color: rgba(71,199,138,.7); background: rgba(71,199,138,.08); color: #ddf9eb; }
.answer-option.correct span { float: right; color: var(--green); font-weight: 800; }
.metric-head { display: flex; justify-content: space-between; align-items: end; margin-bottom: 30px; }
.metric-head strong { font-size: 3.3rem; line-height: 1; }
.metric-head span { color: var(--green); font-size: .8rem; font-weight: 750; }
.meter { margin: 19px 0; }
.meter-label { display: flex; justify-content: space-between; margin-bottom: 8px; color: var(--muted-strong); font-size: .82rem; }
.meter-track { height: 7px; border-radius: 10px; background: #202b3b; overflow: hidden; }
.meter-fill { height: 100%; background: linear-gradient(90deg, #147cf3, #55a4ff); border-radius: inherit; }
.w86 { width: 86%; } .w71 { width: 71%; } .w62 { width: 62%; }
.offline-icon { margin: 0 auto 25px; width: 100px; height: 100px; border: 1px solid #2d435f; border-radius: 50%; display: grid; place-items: center; background: rgba(22,130,255,.07); color: var(--blue-light); }
.offline-icon svg { width: 47px; }
.privacy-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.privacy-grid div { padding: 18px 12px; text-align: center; border: 1px solid #253347; border-radius: 12px; color: var(--muted-strong); font-size: .82rem; }
.privacy-grid strong { display: block; color: var(--ink); font-size: 1.3rem; }

.how { background: #0b1119; border-block: 1px solid rgba(255,255,255,.07); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 45px; }
.step { position: relative; padding: 0 28px 0 0; }
.step:not(:last-child)::after { content: ""; position: absolute; width: 40px; height: 1px; right: 18px; top: 17px; background: #39506d; }
.step-num { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid #3e5d85; background: #101d2d; border-radius: 50%; color: var(--blue-light); font-size: .76rem; font-weight: 800; margin-bottom: 18px; }
.step h3 { font-size: 1rem; letter-spacing: -.01em; }
.step p { margin: 0; color: var(--muted); font-size: .87rem; line-height: 1.55; }

.price-box { display: grid; grid-template-columns: 1fr .75fr; gap: 60px; align-items: center; padding: 55px; border: 1px solid #28405f; background: linear-gradient(135deg, #111c2a, #0b1119); border-radius: 26px; box-shadow: 0 25px 70px rgba(0,0,0,.2); }
.price { text-align: right; }
.price strong { display: block; font-size: clamp(3.5rem, 7vw, 5.4rem); line-height: 1; letter-spacing: -.06em; }
.price span { color: var(--muted); }
.price-note { display: inline-block; margin-top: 12px; padding: 7px 11px; border-radius: 100px; background: rgba(71,199,138,.1); color: #8ee0b8 !important; font-size: .76rem; font-weight: 800; }

.faq-list { max-width: 800px; }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; list-style: none; cursor: pointer; padding: 23px 46px 23px 0; font-weight: 720; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 5px; top: 19px; color: var(--blue-light); font-size: 1.45rem; font-weight: 400; }
details[open] summary::after { content: "–"; }
details p { margin: -5px 45px 24px 0; color: var(--muted); }
.disclaimer { padding: 27px; background: #0c121b; border-left: 3px solid #536781; color: var(--muted-strong); font-size: .9rem; }

.site-footer { padding: 55px 0; border-top: 1px solid rgba(255,255,255,.08); }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; align-items: center; color: var(--muted); font-size: .84rem; }
.footer-links { display: flex; gap: 24px; }
.footer-links a:hover { color: var(--ink); }

.page-hero { padding: 90px 0 55px; }
.page-hero h1 { font-size: clamp(2.7rem, 6vw, 4.7rem); margin-bottom: 18px; }
.page-hero p { max-width: 650px; margin: 0; color: var(--muted-strong); font-size: 1.13rem; }
.prose { max-width: 760px; padding-bottom: 110px; }
.prose h2 { margin: 56px 0 15px; font-size: 1.6rem; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: var(--muted); }
.prose a { color: #8fc5ff; text-underline-offset: 3px; }
.prose .updated { color: #728298; font-size: .85rem; }
.support-card { margin-top: 48px; padding: 34px; border: 1px solid #284260; background: #0e1722; border-radius: var(--radius); }
.support-card p { margin-bottom: 0; }
.button { display: inline-flex; align-items: center; justify-content: center; margin-top: 13px; padding: 12px 19px; border-radius: 10px; background: var(--blue); color: #fff !important; text-decoration: none; font-weight: 750; }
.button:hover { background: #3090ff; }

@media (max-width: 850px) {
  .hero { padding-top: 65px; }
  .hero-grid, .feature, .price-box { grid-template-columns: 1fr; gap: 55px; }
  .card-scene { max-width: 500px; }
  .feature.reverse .feature-copy, .feature.reverse .feature-visual { order: initial; }
  .feature + .feature { margin-top: 90px; }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 42px 20px; }
  .step:nth-child(2)::after { display: none; }
  .price { text-align: left; }
}
@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1100px); }
  .nav { min-height: 68px; }
  .nav-links a:first-child { display: none; }
  .nav-links { gap: 18px; }
  .hero { padding: 54px 0 75px; }
  .hero-grid { gap: 38px; }
  h1 { font-size: 3.25rem; }
  .store-badge { width: 100%; }
  .flashcard { min-height: 445px; }
  .scene { height: 250px; }
  .rule-pill { right: 5px; }
  .section { padding: 76px 0; }
  .visual-panel { min-height: 320px; padding: 23px; }
  .privacy-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }
  .price-box { padding: 32px 24px; }
  .footer-grid { display: grid; }
  .page-hero { padding-top: 65px; }
  .support-card { padding: 25px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}