:root{
  --ink:#121a33; --muted:#566079; --line:#dfe4ef; --bg:#f6f7fb; --paper:#fff;
  --blue:#1d48b0; --blue-d:#0f2a6b; --blue-soft:#e8eefb; --sun:#ffc94d; --ok:#1d7a4f;
  --r:16px; --shadow:0 1px 2px rgba(18,26,51,.06),0 8px 24px rgba(18,26,51,.07);
  --f:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --fh:"Inter Tight","Inter",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 var(--f);color:var(--ink);background:var(--bg)}
img{max-width:100%;display:block}
a{color:var(--blue)}
h1,h2,h3{font-family:var(--fh);line-height:1.15;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2rem,5.5vw,3.4rem);font-weight:800}
h2{font-size:clamp(1.5rem,3.4vw,2.2rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.muted{color:var(--muted)}
.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}

/* header */
.top{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:16px;height:62px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:800 1.1rem var(--fh);letter-spacing:-.02em;white-space:nowrap}
.logo i{width:32px;height:32px;border-radius:9px;background:var(--blue);display:grid;place-items:center;color:#fff;font-style:normal;font-size:.95rem}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--ink);text-decoration:none;font-weight:600;font-size:.95rem;padding:8px 12px;border-radius:10px}
.nav a:hover,.nav a[aria-current]{background:var(--blue-soft);color:var(--blue)}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font:600 .95rem var(--f);color:var(--ink)}
@media (max-width:760px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:62px;background:#fff;flex-direction:column;padding:8px 16px 16px;border-bottom:1px solid var(--line);margin:0}
  .nav.open{display:flex}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:700 .95rem var(--f);text-decoration:none;border-radius:12px;padding:12px 18px;border:1.5px solid transparent;cursor:pointer;transition:transform .12s,background .15s,border-color .15s}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d)}
.btn-sun{background:var(--sun);color:var(--blue-d)}
.btn-sun:hover{background:#ffbc1f}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn-sm{padding:9px 13px;font-size:.88rem;border-radius:10px}

/* hero */
.hero{background:radial-gradient(1200px 500px at 85% -10%,#3a6be0 0,transparent 60%),linear-gradient(160deg,#16399a,#0f2a6b);color:#fff;padding:72px 0 80px;overflow:hidden}
.hero .eyebrow{color:var(--sun)}
.hero p.lead{font-size:clamp(1.05rem,2.2vw,1.25rem);max-width:640px;color:#dfe7ff}
.hero .actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.stack{position:relative;height:340px}
.stack img{position:absolute;width:220px;border-radius:10px;box-shadow:0 20px 50px rgba(0,0,0,.35)}
.stack img:nth-child(1){left:0;top:40px;transform:rotate(-8deg)}
.stack img:nth-child(2){left:110px;top:10px;transform:rotate(2deg);z-index:2}
.stack img:nth-child(3){left:220px;top:50px;transform:rotate(9deg)}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr}.stack{height:250px;max-width:380px}.stack img{width:150px}.stack img:nth-child(2){left:85px}.stack img:nth-child(3){left:170px}}
.facts{display:flex;flex-wrap:wrap;gap:22px;margin-top:34px}
.facts b{display:block;font:800 1.6rem var(--fh)}
.facts span{color:#c9d6ff;font-size:.9rem}

section.block{padding:64px 0}
section.block.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.head{max-width:720px;margin-bottom:30px}

/* language cards */
.langs{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media (max-width:860px){.langs{grid-template-columns:1fr}}
.lang{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow);text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:12px;transition:transform .15s,border-color .15s}
.lang:hover{transform:translateY(-3px);border-color:var(--blue)}
.lang .flag{font-size:2rem;line-height:1}
.lang ul{margin:0;padding-left:18px;color:var(--muted);font-size:.93rem}
.lang .go{margin-top:auto;font-weight:700;color:var(--blue)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
@media (max-width:760px){.steps{grid-template-columns:1fr}}
.step{background:var(--bg);border-radius:var(--r);padding:22px;position:relative}
.step:before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800;margin-bottom:12px}

/* package */
.pack{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;background:linear-gradient(135deg,#16399a,#0f2a6b);color:#fff;border-radius:22px;padding:30px;box-shadow:var(--shadow)}
.pack .eyebrow{color:var(--sun)}
.pack p{color:#dbe4ff;margin:0}
.prices{display:flex;flex-wrap:wrap;gap:12px}
.price-box{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);border-radius:14px;padding:14px 16px;min-width:170px}
.price-box small{display:block;color:#c9d6ff;font-size:.82rem}
.price-box b{font:800 1.8rem var(--fh)}
.price-box .btn{margin-top:10px;width:100%}
@media (max-width:860px){.pack{grid-template-columns:1fr}}

/* books */
.books{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:26px}
@media (max-width:900px){.books{grid-template-columns:1fr}}
.book{background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);display:grid;grid-template-columns:150px 1fr;gap:20px;padding:20px}
@media (max-width:480px){.book{grid-template-columns:96px 1fr;gap:14px;padding:16px}}
.book img{border-radius:8px;border:1px solid var(--line);aspect-ratio:1/1.414;object-fit:cover;width:100%}
.lvl{display:inline-block;background:var(--blue-soft);color:var(--blue);font-weight:700;font-size:.8rem;border-radius:8px;padding:3px 9px;margin-bottom:8px}
.meta{font-size:.9rem;color:var(--muted);margin-bottom:12px}
.opts{display:grid;gap:8px;margin:12px 0}
.opt-row{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid var(--line);border-radius:12px;padding:9px 10px 9px 14px}
.opt-row span{font-size:.92rem}
.opt-row b{font:800 1.15rem var(--fh);white-space:nowrap}
.opt-row .r{display:flex;align-items:center;gap:10px}
.demo-links{display:flex;flex-wrap:wrap;gap:8px}
.book details{grid-column:1/-1;border-top:1px dashed var(--line);padding-top:12px}
.book summary{cursor:pointer;font-weight:700;color:var(--blue);font-size:.93rem}
.book ol{margin:10px 0 0;padding-left:22px;font-size:.9rem;color:var(--muted);columns:2;column-gap:28px}
.book ol li{break-inside:avoid;margin-bottom:4px}
@media (max-width:640px){.book ol{columns:1}}

/* word tests */
.tests{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin-top:24px}
.test{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px}
.test .n{font:800 1.3rem var(--fh)}
.test .sample{font-size:.88rem;color:var(--muted)}
.test .foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto}
.test .foot b{font:800 1.3rem var(--fh)}
.feat{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.feat span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:.88rem;font-weight:600}

/* faq */
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin-bottom:10px}
.faq summary{font-weight:700;cursor:pointer}
.faq details p{margin:10px 0 0;color:var(--muted)}

/* about */
.about{display:grid;grid-template-columns:auto 1fr;gap:26px;align-items:start}
.avatar{width:110px;height:110px;border-radius:28px;background:var(--blue);color:#fff;display:grid;place-items:center;font:800 2.4rem var(--fh)}
@media (max-width:640px){.about{grid-template-columns:1fr}}

/* page hero */
.phero{background:linear-gradient(160deg,#16399a,#0f2a6b);color:#fff;padding:52px 0 56px}
.phero p{color:#dbe4ff;max-width:680px;font-size:1.08rem}
.crumb{font-size:.88rem;color:#c9d6ff;margin-bottom:14px}
.crumb a{color:#fff}
.subnav{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.subnav a{color:#fff;text-decoration:none;border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:7px 14px;font-weight:600;font-size:.9rem}
.subnav a:hover{background:rgba(255,255,255,.12)}

/* footer */
footer{background:#0b1a44;color:#c9d6ff;padding:44px 0 30px;font-size:.93rem}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:26px}
footer a{color:#fff;text-decoration:none}
footer a:hover{text-decoration:underline}
footer ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
footer h3{color:#fff;font-size:1rem}
footer .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;font-size:.85rem}
@media (max-width:760px){footer .cols{grid-template-columns:1fr}}

/* order dialog */
dialog{border:none;border-radius:20px;padding:0;max-width:440px;width:calc(100% - 32px);box-shadow:0 30px 80px rgba(0,0,0,.35)}
dialog::backdrop{background:rgba(10,18,40,.55)}
.dlg{padding:24px}
.dlg h3{margin-bottom:4px}
.dlg .sum{display:flex;justify-content:space-between;align-items:baseline;background:var(--bg);border-radius:12px;padding:12px 14px;margin:14px 0}
.dlg .sum b{font:800 1.4rem var(--fh)}
.dlg textarea{width:100%;font:15px/1.5 var(--f);border:1px solid var(--line);border-radius:12px;padding:10px 12px;resize:none;color:var(--ink)}
.dlg .row{display:grid;gap:8px;margin-top:12px}
.dlg .x{float:right;background:none;border:none;font-size:1.5rem;line-height:1;cursor:pointer;color:var(--muted)}
.toast{font-size:.85rem;color:var(--ok);min-height:1.2em;margin-top:6px}
[hidden]{display:none!important}
html,body{overflow-x:clip}
.eyebrow{overflow-wrap:anywhere}
.opt-row .btn{white-space:nowrap}
@media (max-width:560px){
  .book{grid-template-columns:1fr}
  .book img{width:120px}
  .opt-row{padding:8px 8px 8px 12px}
}