:root{
  --duo-white:#ffffff;
  --duo-black:#05070b;
  --duo-blue:#07175f;
  --duo-blue-2:#0b2a8f;
  --duo-text:#111827;
  --duo-muted:#5b6472;
  --duo-light:#f5f7fb;
  --duo-border:rgba(7,23,95,.12);
  --duo-shadow:0 18px 55px rgba(7,23,95,.12);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.bi-duolingo-page{margin:0;overflow-x:hidden;background:var(--duo-white);color:var(--duo-text);font-family:"Inter","Segoe UI",Arial,sans-serif}
body.bi-duolingo-page h1,body.bi-duolingo-page h2,body.bi-duolingo-page h3,body.bi-duolingo-page p{margin-top:0}
body.bi-duolingo-page p{color:var(--duo-muted);line-height:1.75}
.duo-shell{width:min(1180px,calc(100% - 40px));margin:0 auto}

.bi-site-header{position:fixed;inset:0 0 auto 0;width:100%;z-index:1000;display:flex;justify-content:center;padding:16px 20px;background:transparent}
.bi-site-header .navbar{width:min(1180px,100%);min-height:76px;height:auto;margin:0 auto;padding:12px 18px;border-radius:22px;background:rgba(5,7,11,.84);border:1px solid rgba(255,255,255,.12);box-shadow:0 18px 45px rgba(0,0,0,.18);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}
.bi-site-header .logo img{width:48px;height:48px;padding:4px;background:#fff}
.bi-site-header .logo h2,.bi-site-header .logo a{font-family:"Orbitron",sans-serif;font-size:clamp(.95rem,1.4vw,1.2rem);color:#fff;white-space:nowrap}
.bi-site-header .navbar .links{align-items:center;gap:1.15rem;margin:0;padding:0}
.bi-site-header .navbar .links a{color:rgba(255,255,255,.88);font-size:.95rem;font-weight:700}
.bi-site-header .navbar .links a:hover{color:#fff}
.bi-site-header .navbar .dropdown-content{background:#05070b;border:1px solid rgba(255,255,255,.12);box-shadow:0 18px 40px rgba(0,0,0,.22);border-radius:16px;overflow:hidden}
.bi-site-header .lang-btn{width:42px;height:42px;border-radius:999px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.1);color:#fff}
.bi-site-header .toggle_btn{width:42px;height:42px;align-items:center;justify-content:center;border-radius:999px;background:rgba(255,255,255,.1)}

.duo-kicker{display:inline-flex;width:fit-content;padding:9px 14px;border-radius:999px;background:rgba(7,23,95,.08);color:var(--duo-blue);border:1px solid var(--duo-border);font-size:.78rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}

.duo-hero{position:relative;min-height:94vh;display:flex;align-items:center;padding:150px 0 90px;background:radial-gradient(circle at 84% 18%,rgba(7,23,95,.14),transparent 32%),linear-gradient(180deg,#f7f9ff 0%,#fff 82%);overflow:hidden}
.duo-hero-bg{position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.90),rgba(255,255,255,.65)),url("assets/images/duolingo/duolingo.png") center/cover no-repeat;opacity:.34;transform:scale(1.04);animation:duoSlowMove 26s ease-in-out infinite alternate}
@keyframes duoSlowMove{from{transform:scale(1.04) translate3d(-10px,-6px,0)}to{transform:scale(1.11) translate3d(18px,10px,0)}}
.duo-hero:after{content:"";position:absolute;right:-140px;bottom:-150px;width:410px;height:410px;border-radius:50%;background:rgba(7,23,95,.1)}
.duo-hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,.72fr);gap:48px;align-items:center}
.duo-hero-text h1{max-width:770px;margin:20px 0;color:var(--duo-black);font-size:clamp(2.45rem,5vw,5rem);line-height:1;letter-spacing:-.055em}
.duo-hero-text p{max-width:680px;font-size:clamp(1rem,1.35vw,1.18rem)}
.duo-hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.duo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:14px 22px;border-radius:999px;text-decoration:none;font-weight:900;transition:.25s ease}
.duo-btn:hover{transform:translateY(-3px)}
.duo-btn-primary{background:var(--duo-blue);color:#fff;box-shadow:0 14px 35px rgba(7,23,95,.26)}
.duo-btn-primary:hover{background:var(--duo-black);color:#fff}
.duo-btn-secondary{background:#fff;color:var(--duo-blue);border:1px solid var(--duo-border)}
.duo-trust-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px;color:var(--duo-blue);font-weight:900;font-size:.92rem}
.duo-trust-row i{margin-right:6px}

.duo-hero-card{animation:duoFloat 6s ease-in-out infinite}
.duo-score-card{background:rgba(255,255,255,.86);border:1px solid rgba(7,23,95,.14);box-shadow:var(--duo-shadow);border-radius:30px;overflow:hidden;backdrop-filter:blur(18px)}
.duo-score-card img{width:100%;height:290px;object-fit:cover;display:block;filter:saturate(1.02)}
.duo-score-content{padding:28px}
.duo-score-label{display:inline-block;color:var(--duo-blue);font-weight:900;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
.duo-score-content h2{color:var(--duo-blue);font-size:1.45rem;line-height:1.25;margin-bottom:10px}
.duo-score-content p{margin:0}
@keyframes duoFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

.duo-why-section,.duo-skills-section,.duo-plans-section,.duo-form-section{padding:88px 0}
.duo-section-heading{text-align:center;max-width:790px;margin:0 auto 42px}
.duo-section-heading h2,.duo-skills-grid h2,.duo-form-info h2{color:var(--duo-blue);font-size:clamp(2rem,4vw,3.25rem);line-height:1.12;letter-spacing:-.035em;margin:18px 0}
.duo-feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.duo-feature-grid article{background:#fff;border:1px solid var(--duo-border);border-radius:28px;padding:30px;box-shadow:0 14px 38px rgba(7,23,95,.08);transition:.25s ease}
.duo-feature-grid article:hover{transform:translateY(-7px);box-shadow:var(--duo-shadow)}
.duo-feature-grid i,.duo-plan-icon{width:48px;height:48px;border-radius:16px;background:var(--duo-blue);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:1.15rem;margin-bottom:18px}
.duo-feature-grid h3,.duo-plans-grid h3{color:var(--duo-black);font-size:1.25rem;margin-bottom:10px}
.duo-feature-grid p,.duo-plans-grid p{margin:0}

.duo-skills-section{background:var(--duo-light)}
.duo-skills-grid{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}
.duo-skill-list{display:grid;gap:14px}
.duo-skill-list div{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--duo-border);border-radius:18px;padding:18px;box-shadow:0 10px 28px rgba(7,23,95,.06);font-weight:800;color:var(--duo-text)}
.duo-skill-list i{width:40px;height:40px;border-radius:14px;background:rgba(7,23,95,.09);color:var(--duo-blue);display:inline-flex;align-items:center;justify-content:center;min-width:40px}

.duo-plans-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.duo-plans-grid article{background:#fff;border:1px solid var(--duo-border);border-radius:28px;padding:30px;box-shadow:0 14px 38px rgba(7,23,95,.08);transition:.25s ease}
.duo-plans-grid article:hover{transform:translateY(-7px);box-shadow:var(--duo-shadow)}
.duo-plan-featured{background:linear-gradient(180deg,#ffffff 0%,#f4f7ff 100%)!important;border-color:rgba(7,23,95,.22)!important}

.duo-quote-section{padding:70px 0;background:linear-gradient(135deg,#020617 0%,#07175f 62%,#000 100%);color:#fff}
.duo-quote-section blockquote{max-width:900px;margin:0 auto;text-align:center;font-size:clamp(1.35rem,3vw,2.25rem);font-weight:900;line-height:1.35;letter-spacing:-.03em}

.duo-form-section{background:linear-gradient(180deg,#f7f9ff 0%,#fff 100%)}
.duo-form-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:36px;align-items:start}
.duo-form-info{position:sticky;top:120px}
.duo-contact-box{margin-top:24px;background:#fff;border:1px solid var(--duo-border);border-radius:22px;padding:22px;box-shadow:0 12px 34px rgba(7,23,95,.08)}
.duo-contact-box p{margin:0 0 8px}.duo-contact-box p:last-child{margin-bottom:0}
.duo-form{background:#fff;border:1px solid var(--duo-border);box-shadow:var(--duo-shadow);border-radius:30px;padding:30px}
.duo-form-group{margin-bottom:18px}
.duo-form label{display:block;font-weight:900;color:var(--duo-text);font-size:.9rem;margin-bottom:8px}
.duo-form input,.duo-form select,.duo-form textarea{width:100%;border:1px solid rgba(17,24,39,.14);border-radius:14px;padding:13px 14px;background:#fbfcff;color:var(--duo-text);font:inherit;outline:none}
.duo-form input,.duo-form select{height:48px}
.duo-form textarea{resize:vertical;min-height:130px}
.duo-form input:focus,.duo-form select:focus,.duo-form textarea:focus{border-color:var(--duo-blue);box-shadow:0 0 0 4px rgba(7,23,95,.08)}
.duo-submit-btn{width:100%;min-height:52px;border:none;border-radius:999px;background:var(--duo-blue);color:#fff;font-weight:900;font-size:1rem;cursor:pointer;transition:.25s ease}
.duo-submit-btn:hover{background:var(--duo-black);transform:translateY(-2px)}

.bi-main-footer{width:100%;background:linear-gradient(135deg,#020617 0%,#07175f 55%,#000 100%);color:#fff;padding:55px 20px 25px;font-family:"Inter","Segoe UI",sans-serif;overflow:hidden}
.bi-footer-container{max-width:1200px;margin:0 auto}.bi-footer-brand{display:flex;align-items:center;gap:18px;padding-bottom:35px;border-bottom:1px solid rgba(255,255,255,.14)}
.bi-footer-brand img{width:72px;height:72px;border-radius:50%;object-fit:cover;background:#fff;padding:5px}.bi-footer-brand h2{margin:0 0 8px;font-size:1.6rem;color:#fff}.bi-footer-brand p{margin:0;max-width:650px;color:rgba(255,255,255,.78);line-height:1.6}
.bi-footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:35px;padding:38px 0}.bi-footer-col h3{color:#fff;font-size:1.05rem;margin-bottom:16px}.bi-footer-col h3:after{content:"";width:38px;height:3px;background:#fff;display:block;margin-top:8px;border-radius:20px}.bi-footer-col a{display:block;color:rgba(255,255,255,.76);text-decoration:none;margin-bottom:11px;font-size:.95rem;transition:.25s ease}.bi-footer-col a:hover{color:#fff;transform:translateX(5px)}
.bi-footer-socials{display:flex;gap:12px;flex-wrap:wrap}.bi-footer-socials a{width:42px;height:42px;margin:0;border-radius:50%;background:#fff;color:#07175f;display:inline-flex;align-items:center;justify-content:center;font-size:1.05rem}.bi-footer-socials a:hover{background:#07175f;color:#fff;outline:1px solid #fff;transform:translateY(-4px)}.bi-footer-bottom{text-align:center;padding-top:22px;border-top:1px solid rgba(255,255,255,.14)}.bi-footer-bottom p{margin:0;color:rgba(255,255,255,.72);font-size:.92rem}

@media(max-width:1020px){.duo-hero-grid,.duo-skills-grid,.duo-form-grid{grid-template-columns:1fr}.duo-form-info{position:static}.duo-feature-grid,.duo-plans-grid{grid-template-columns:1fr 1fr}.bi-site-header .navbar .links{gap:.7rem}.bi-site-header .navbar .links a{font-size:.88rem}}
@media(max-width:768px){.bi-site-header{padding:10px 12px}.bi-site-header .navbar{border-radius:18px}.bi-site-header .navbar .links{position:absolute;top:calc(100% + 10px);left:0;right:0;display:none;flex-direction:column;align-items:stretch;background:#05070b;border-radius:18px;padding:14px;border:1px solid rgba(255,255,255,.12)}.bi-site-header .navbar .links.mobile-visible{display:flex}.bi-site-header .navbar .dropdown-content{position:static;box-shadow:none;background:rgba(255,255,255,.06);margin-top:8px}.bi-site-header .navbar .dropdown-content.open-submenu{display:block}.bi-site-header .toggle_btn{display:flex}.duo-hero{min-height:auto;padding:130px 0 60px}.duo-hero-grid{gap:28px}.duo-hero-text h1{font-size:clamp(2.3rem,12vw,4rem)}.duo-score-card img{height:220px}.duo-why-section,.duo-skills-section,.duo-plans-section,.duo-form-section{padding:64px 0}.duo-feature-grid,.duo-plans-grid{grid-template-columns:1fr}.duo-shell{width:min(100% - 28px,1180px)}.duo-form{padding:22px}.bi-footer-grid{grid-template-columns:1fr 1fr}.bi-footer-brand{align-items:flex-start;flex-direction:column}}
@media(max-width:560px){.bi-site-header .logo h2,.bi-site-header .logo a{font-size:.9rem}.bi-site-header .logo img{width:42px;height:42px}.duo-hero-actions,.duo-trust-row{flex-direction:column;align-items:flex-start}.duo-btn{width:100%}.duo-score-card,.duo-form{border-radius:22px}.duo-skill-list div{align-items:flex-start}.bi-footer-grid{grid-template-columns:1fr}.bi-main-footer{padding:45px 18px 22px}.bi-footer-col a:hover{transform:none}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}