:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface2: #1e1e1e;
  --surface3: #2a2a2a;
  --border: #2b2b2b;
  --text: #ffffff;
  --mid: #b3b3b3;
  --muted: #8a8a8a;
  --red: #e50914;
  --red-dark: #b20710;
  --red-dim: rgba(229, 9, 20, 0.12);
  --green: #46d369;
  --gold: #f5c518;
  --orange: #ff9600;
  --sky: #1cb0f6;
  --purple: #ce82ff;
  --radius: 18px;
  --max: 1120px;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(10, 10, 10, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; text-decoration: none; letter-spacing: -0.02em; }
.logo img { width: 36px; height: 36px; border-radius: 10px; }
.logo span b { color: var(--red); font-weight: 800; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a:not(.btn) { color: var(--mid); text-decoration: none; font-size: 15px; font-weight: 600; }
.nav-links a:not(.btn):hover { color: var(--text); }
@media (max-width: 760px) { .nav-links a:not(.btn) { display: none; } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px;
  border-radius: 999px; border: 0;
  background: var(--red); color: #fff;
  font: inherit; font-size: 15px; font-weight: 700;
  text-decoration: none; cursor: pointer;
  transition: background .15s, transform .15s;
}
.btn:hover { background: var(--red-dark); }
.btn:active { transform: translateY(1px); }
.btn.small { min-height: 40px; padding: 0 18px; }
.btn:focus-visible, summary:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; }

/* ---------- Common ---------- */
section { padding: 96px 0; }
.eyebrow {
  display: inline-block; margin-bottom: 14px;
  color: var(--red); font-size: 13px; font-weight: 800;
  letter-spacing: .12em; text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.12; letter-spacing: -0.03em; margin: 0; }
h1 { font-size: clamp(40px, 6.4vw, 72px); font-weight: 800; }
h2 { font-size: clamp(32px, 4.4vw, 50px); font-weight: 800; }
h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.lead { color: var(--mid); font-size: clamp(18px, 2vw, 21px); max-width: 620px; }
.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head p { color: var(--mid); margin: 16px 0 0; }
.red { color: var(--red); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 96px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -30% -10% auto auto; width: 720px; height: 720px;
  background: radial-gradient(circle, rgba(229, 9, 20, .22), transparent 62%);
  pointer-events: none;
}
.hero .wrap { display: grid; grid-template-columns: 1.08fr .92fr; gap: 56px; align-items: center; position: relative; }
@media (max-width: 920px) { .hero .wrap { grid-template-columns: 1fr; } }

.status {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 7px 14px; margin-bottom: 26px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
  font-size: 14px; font-weight: 600; color: var(--mid);
}
.status i { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgba(70, 211, 105, .18); }
.hero .lead { margin: 22px 0 32px; }

/* Preview card (mirrors the in-app question card) */
.preview { position: relative; }
.preview .owl {
  position: absolute; width: 118px; right: -8px; top: -64px; z-index: 2;
  border-radius: 28px; transform: rotate(8deg);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .5);
}
@media (max-width: 920px) {
  .preview { margin-top: 40px; }
  .preview .owl { top: -56px; right: 8px; width: 88px; }
  .quiz-top { padding-right: 88px; }
}
.quiz { padding: 22px; box-shadow: 0 30px 80px rgba(0, 0, 0, .55); }
.quiz-top { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; padding-right: 100px; font-size: 13px; color: var(--muted); font-weight: 600; }
.bar { flex: 1; height: 6px; background: var(--surface3); border-radius: 99px; overflow: hidden; display: flex; gap: 3px; }
.bar b { display: block; height: 100%; width: 10%; }
.bar .ok { background: var(--green); }
.bar .no { background: var(--red); }
.cefr { font-size: 12px; font-weight: 800; padding: 3px 9px; border-radius: 6px; letter-spacing: .04em; }
.cefr.b1 { background: rgba(70, 211, 105, .14); color: var(--green); }
.cefr.b2 { background: rgba(28, 176, 246, .14); color: var(--sky); }
.cefr.c1 { background: var(--red-dim); color: #ff4d55; }
.cefr.c2 { background: rgba(206, 130, 255, .14); color: var(--purple); }
.word { font-size: 34px; font-weight: 800; letter-spacing: -0.02em; margin: 4px 0 2px; }
.pos { color: var(--muted); font-size: 14px; font-style: italic; margin-bottom: 16px; }
.context {
  border-left: 3px solid var(--red); padding: 4px 0 4px 14px; margin: 0 0 18px;
  font-style: italic; font-size: 15px; color: #e6e6e6; user-select: none;
}
.context cite { display: block; font-style: normal; font-size: 12px; color: var(--muted); margin-top: 6px; }
.options { display: grid; gap: 9px; }
.opt {
  min-height: 48px; display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; border-radius: 12px;
  background: var(--surface2); border: 1px solid var(--border); font-size: 15px;
}
.opt.correct { background: #0d1f0d; border-color: var(--green); }
.opt .tick { margin-left: auto; color: var(--green); font-weight: 800; font-size: 13px; white-space: nowrap; }
.quiz-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; font-size: 13px; color: var(--muted); flex-wrap: wrap; gap: 8px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 99px; border: 1px solid var(--border); font-weight: 600; color: var(--mid); }
.xp { color: var(--gold); font-weight: 800; }

/* ---------- Problem / Solution ---------- */
.split { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.split .card { padding: 26px; }
.split .ico { font-size: 28px; margin-bottom: 14px; line-height: 1; }
.split p { color: var(--mid); margin: 8px 0 0; font-size: 16px; }
.problem .card { border-color: #2d1414; background: linear-gradient(180deg, #160c0c, var(--surface)); }
.problem .quote { color: #ff6b72; font-style: italic; }
.way { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.way .card { background: var(--bg); }

/* ---------- How it works ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; counter-reset: s; }
.steps li { padding: 26px; position: relative; counter-increment: s; }
.steps li::before {
  content: counter(s); display: grid; place-items: center;
  width: 40px; height: 40px; border-radius: 12px; margin-bottom: 18px;
  background: var(--red); font-weight: 800; font-size: 18px;
}
.steps p { color: var(--mid); margin: 8px 0 0; font-size: 16px; }

/* ---------- Question types ---------- */
.types { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 16px; }
.type { padding: 24px; display: flex; flex-direction: column; }
.type .tag { font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.type h3 { margin: 6px 0 8px; }
.type > p { color: var(--mid); margin: 0 0 20px; font-size: 16px; }
.mini { margin-top: auto; background: var(--bg); border: 1px solid var(--border); border-radius: 14px; padding: 16px; font-size: 15px; }
.mini .opt { min-height: 40px; padding: 8px 12px; font-size: 14px; }
.mini .options { gap: 7px; margin-top: 12px; }
.blank { display: inline-block; min-width: 92px; border-bottom: 2px solid var(--red); color: var(--red); font-weight: 700; text-align: center; }
.fake-input { margin-top: 12px; display: flex; gap: 8px; }
.fake-input span { flex: 1; padding: 9px 12px; border-radius: 10px; background: var(--surface2); border: 1px solid var(--border); color: var(--text); }
.fake-input b { padding: 9px 14px; border-radius: 10px; background: var(--red); font-size: 14px; }

/* ---------- Science ---------- */
.science .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.science .card { padding: 28px; }
.science .big { font-size: 44px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; margin-bottom: 14px; }
.science p { color: var(--mid); margin: 8px 0 0; font-size: 16px; }
.science .src { display: block; margin-top: 14px; font-size: 13px; color: var(--muted); }

/* ---------- Levels ---------- */
.levels { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.level { padding: 22px; }
.level .cefr { font-size: 15px; padding: 6px 12px; }
.level h3 { margin: 16px 0 6px; font-size: 18px; }
.level p { margin: 0; color: var(--mid); font-size: 15px; }

/* ---------- Gamification strip ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 16px; }
.stat { padding: 22px; display: flex; gap: 16px; align-items: center; }
.stat .emoji { font-size: 34px; line-height: 1; }
.stat b { display: block; font-size: 17px; }
.stat span { color: var(--mid); font-size: 15px; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; }
.faq details { border-bottom: 1px solid var(--border); }
.faq summary {
  list-style: none; cursor: pointer; padding: 22px 40px 22px 0; position: relative;
  font-size: 18px; font-weight: 700;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 16px; font-size: 28px; color: var(--red); font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 22px; color: var(--mid); }

/* ---------- Final CTA ---------- */
.cta .card {
  padding: clamp(32px, 6vw, 72px);
  display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
  background: radial-gradient(ellipse at 100% 0%, rgba(229, 9, 20, .28), transparent 60%), var(--surface);
}
.cta img { width: 220px; border-radius: 40px; }
.cta .lead { margin: 18px 0 28px; }
@media (max-width: 760px) { .cta .card { grid-template-columns: 1fr; } .cta img { width: 140px; order: -1; } }
.stores { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.store {
  display: inline-flex; align-items: center; gap: 10px; padding: 9px 16px;
  border-radius: 12px; border: 1px solid var(--border); background: var(--bg);
  font-size: 12px; color: var(--muted); line-height: 1.25;
}
.store svg { width: 22px; height: 22px; fill: var(--text); }
.store b { display: block; font-size: 15px; color: var(--text); }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--border); padding: 40px 0 56px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: flex-start; }
footer nav { display: flex; gap: 22px; flex-wrap: wrap; }
footer nav a { color: var(--mid); text-decoration: none; }
footer nav a:hover { color: var(--text); }
footer p { margin: 10px 0 0; max-width: 460px; }