:root{
    --bg:#ffffff;
    --alt:#f5f5f7;
    --text:#1d1d1f;
    --text2:#6e6e73;
    --blue:#0071e3;
    --link:#0066cc;
    --line:#d2d2d7;
    --sf:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue",Helvetica,Arial,sans-serif;
    --maxw:980px;
    --ease:cubic-bezier(.28,.11,.32,1);
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:var(--sf);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.5}
  a{color:inherit;text-decoration:none;cursor:pointer}
  button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
  ::selection{background:#b4d7ff}

  /* ---------- NAV ---------- */
  .nav{position:fixed;top:0;left:0;right:0;z-index:200;height:48px;
    background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);
    border-bottom:1px solid rgba(0,0,0,.08)}
  .nav-inner{max-width:1024px;margin:0 auto;height:100%;display:flex;align-items:center;justify-content:center;padding:0 22px;position:relative}
  .logo{font-size:1.15rem;font-weight:600;letter-spacing:-.02em;position:absolute;left:22px;top:50%;transform:translateY(-50%)}
  .logo .at{color:var(--blue)}
  .nav-links{display:flex;gap:34px;align-items:center}
  .nav-links a{font-size:.8rem;color:#1d1d1f;opacity:.85;transition:opacity .2s;font-weight:400}
  .nav-links a:hover{opacity:1}
  .bag{font-size:.95rem;display:flex;align-items:center;gap:5px;opacity:.85}
  .bag:hover{opacity:1}
  .bag .n{font-size:.7rem;background:var(--blue);color:#fff;min-width:16px;height:16px;border-radius:9px;display:grid;place-items:center;padding:0 4px;font-weight:600}
  .burger{display:none;font-size:1.5rem;line-height:1;position:absolute;right:18px;top:50%;transform:translateY(-50%)}

  /* ---------- TYPE ---------- */
  .eyebrow{font-size:1.25rem;font-weight:600;letter-spacing:-.01em;margin-bottom:6px}
  h1,h2{font-weight:600;letter-spacing:-.022em;line-height:1.05}
  h1{font-size:clamp(2.8rem,6vw,4.2rem)}
  h2{font-size:clamp(2.2rem,4.6vw,3.3rem)}
  .sub{font-size:clamp(1.15rem,2vw,1.6rem);font-weight:500;color:var(--text);margin-top:8px;line-height:1.25}
  .links{display:flex;gap:26px;justify-content:center;margin-top:20px;flex-wrap:wrap}
  .lk{color:var(--link);font-size:clamp(1.05rem,1.6vw,1.35rem);display:inline-flex;align-items:center;gap:2px}
  .lk:hover{text-decoration:underline}
  .lk::after{content:"\203A";font-size:1.1em;margin-left:1px}

  /* ---------- TILES ---------- */
  .tile{padding:80px 22px;text-align:center;background:var(--bg);overflow:hidden}
  .tile.alt{background:var(--alt)}
  .tile.dark{background:#000;color:#f5f5f7}
  .tile.dark .sub{color:#a1a1a6}
  .tile.dark .lk{color:#2997ff}
  .tile-copy{max-width:760px;margin:0 auto}
  .tile-media{margin:42px auto 0;max-width:560px}
  .tile-media.clickable{cursor:pointer}
  .hero{padding-top:120px}

  .twoup{display:grid;grid-template-columns:1fr 1fr;gap:12px;background:var(--bg)}
  .half{padding:70px 22px;text-align:center;overflow:hidden}
  .half.alt{background:var(--alt)}
  .half h2{font-size:clamp(1.9rem,3.4vw,2.6rem)}
  .half .sub{font-size:clamp(1.05rem,1.7vw,1.35rem)}
  .half .tile-media{max-width:340px;margin-top:34px}

  /* ---------- SCROLL ANIMATION ---------- */
  .reveal{opacity:0;transform:translateY(40px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
  .reveal.in{opacity:1;transform:none}
  .tile-media[data-parallax]{will-change:transform}

  /* ---------- DEVICE MOCKS ---------- */
  .ph{width:230px;margin:0 auto;border-radius:42px;background:#fff;border:1px solid var(--line);
    box-shadow:0 30px 70px rgba(0,0,0,.16);padding:11px;aspect-ratio:9/19}
  .ph-scr{height:100%;border-radius:32px;background:var(--alt);overflow:hidden;display:flex;flex-direction:column}
  .ph-top{padding:16px 16px 8px;font-size:.72rem;color:var(--text2);font-weight:600}
  .ph-body{flex:1;padding:0 16px 16px;display:flex;flex-direction:column}
  .scr-big{font-size:1.6rem;font-weight:600;letter-spacing:-.02em}
  .scr-mut{color:var(--text2);font-size:.82rem;margin-top:6px}
  .chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
  .chips span{width:30px;height:34px;border-radius:8px;background:#fff;border:1px solid var(--line);display:grid;place-items:center;font-weight:600;font-size:.95rem}
  .chips span.hot{background:var(--text);color:#fff;border-color:var(--text)}
  .board{display:grid;grid-template-columns:repeat(5,1fr);gap:5px;margin:auto;width:84%}
  .board i{aspect-ratio:1;background:#fff;border:1px solid var(--line);border-radius:6px;display:grid;place-items:center;font-style:normal}
  .board b{width:62%;aspect-ratio:1;border-radius:50%;display:block}
  .word{display:flex;gap:6px;justify-content:center;margin:auto 0}
  .word span{width:22px;height:30px;border-bottom:3px solid var(--text);font-size:1.3rem;font-weight:600;display:grid;place-items:end center}
  .lesson{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;margin-top:auto}
  .lesson .q{font-weight:600;font-size:1rem}
  .lesson .a{margin-top:8px;background:var(--alt);border-radius:8px;padding:8px 10px;font-size:.85rem;color:var(--text2)}

  .laptop{width:100%;max-width:520px;margin:0 auto}
  .lap-scr{background:#fff;border:1px solid var(--line);border-radius:12px 12px 0 0;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.14)}
  .lap-bar{display:flex;gap:6px;padding:9px 12px;border-bottom:1px solid var(--line)}
  .lap-bar i{width:9px;height:9px;border-radius:50%;background:#e0e0e3}
  .lap-body{padding:16px;display:flex;gap:10px}
  .lap-body .stat{flex:1;background:var(--alt);border-radius:10px;padding:12px}
  .lap-body .stat b{font-size:1.4rem;font-weight:600;display:block}
  .lap-body .stat small{color:var(--text2);font-size:.72rem}
  .lap-base{height:10px;background:#dadade;border-radius:0 0 8px 8px;width:60%;margin:0 auto}

  .browser{display:block;width:100%;max-width:520px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.14);color:var(--text);text-align:left}
  .br-bar{display:flex;align-items:center;gap:7px;padding:10px 12px;border-bottom:1px solid var(--line);background:#f5f5f7}
  .br-bar i{width:9px;height:9px;border-radius:50%;background:#d2d2d7}
  .br-bar .url{margin-left:auto;background:#fff;border:1px solid var(--line);border-radius:980px;padding:4px 12px;font-size:.75rem;color:var(--text2)}
  .br-body{padding:26px;text-align:center}
  .br-logo{font-size:1.8rem;font-weight:500;letter-spacing:-.03em}
  .br-logo b{font-weight:700}
  .br-tag{color:var(--text2);font-size:1rem;margin:8px auto 14px;max-width:36ch}
  .br-link{color:var(--link);font-size:1.05rem}

  /* ---------- BUTTON / PRICE ---------- */
  .btn{display:inline-block;background:var(--blue);color:#fff;font-size:1.05rem;font-weight:400;
    padding:11px 22px;border-radius:980px;transition:background .2s}
  .btn:hover{background:#0077ed}
  .price-row{margin-top:14px;color:var(--text2);font-size:1rem}
  .app-icon{width:104px;height:104px;border-radius:24px;margin:0 auto 20px;box-shadow:0 12px 30px rgba(0,0,0,.18);display:block}
  .shot{width:100%;border-radius:18px;box-shadow:0 24px 60px rgba(0,0,0,.16);display:block}

  /* ---------- APP PAGE ---------- */
  #appView{display:none}
  #appView.on{display:block}
  .back{position:fixed;top:60px;left:18px;z-index:150;background:rgba(255,255,255,.8);backdrop-filter:blur(10px);
    border:1px solid var(--line);border-radius:980px;padding:7px 15px;font-size:.85rem;display:flex;gap:6px;align-items:center}
  .ahero{padding:130px 22px 70px;text-align:center;background:var(--alt)}
  .ahero .eyebrow{color:var(--text2)}
  .ahero h1{margin-bottom:10px}
  .ahero .cta{margin-top:22px;display:flex;gap:24px;justify-content:center;align-items:center;flex-wrap:wrap}
  .feature{padding:90px 22px;text-align:center}
  .feature:nth-child(even){background:var(--alt)}
  .feature h2{max-width:740px;margin:0 auto}
  .feature .sub{max-width:680px;margin:14px auto 0;color:var(--text2)}

  /* ---------- SenLangEdit glyph section ---------- */
  .glyphsec{padding:110px 22px;text-align:center;background:#000;color:#f5f5f7;overflow:hidden}
  .gstage{position:relative;height:min(40vh,340px);display:grid;place-items:center;margin:14px 0}
  .gstage span{position:absolute;font-size:min(36vh,300px);font-weight:600;line-height:1;opacity:0;transform:scale(.85);transition:opacity .6s var(--ease),transform .6s var(--ease)}
  .gstage span.on{opacity:1;transform:scale(1)}
  .glyphsec p{color:#a1a1a6;font-size:1.3rem;max-width:40ch;margin:0 auto}

  /* ---------- OVERLAY (checkout) ---------- */
  .ov{position:fixed;inset:0;z-index:500;background:rgba(0,0,0,.4);backdrop-filter:blur(4px);display:none;align-items:flex-end;justify-content:center}
  .ov.show{display:flex}
  .sheet{width:100%;max-width:480px;background:#fff;border-radius:18px 18px 0 0;padding:26px 24px 34px;max-height:92vh;overflow:auto;transform:translateY(100%);transition:transform .35s var(--ease)}
  .ov.show .sheet{transform:none}
  @media(min-width:600px){.ov{align-items:center}.sheet{border-radius:18px}}
  .sheet h3{font-size:1.4rem;font-weight:600}
  .sheet .x{float:right;font-size:1.4rem;color:var(--text2);line-height:1}
  .ord{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line);font-size:1rem}
  .ord.tot{font-weight:600;font-size:1.2rem;border:none}
  .paylab{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text2);margin:18px 0 10px}
  .pays{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .pay{border:1.5px solid var(--line);border-radius:12px;padding:13px;font-weight:500;font-size:.92rem;text-align:left;display:flex;gap:9px;align-items:center;transition:border-color .2s}
  .pay.sel{border-color:var(--blue)}
  .pay .d{width:28px;height:28px;border-radius:7px;display:grid;place-items:center;font-weight:700;font-size:.72rem;color:#fff}
  .sheet .btn{width:100%;text-align:center;margin-top:22px;font-size:1.1rem;padding:13px}
  .spin{width:40px;height:40px;border:3px solid var(--line);border-top-color:var(--blue);border-radius:50%;margin:24px auto;animation:sp .8s linear infinite}
  @keyframes sp{to{transform:rotate(360deg)}}
  .ok{width:64px;height:64px;border-radius:50%;background:#34c759;color:#fff;display:grid;place-items:center;font-size:2rem;margin:10px auto 14px}
  .lic{background:var(--alt);border-radius:10px;padding:12px;text-align:center;margin:14px 0}
  .lic .k{font-weight:600;letter-spacing:.08em}
  .lic small{color:var(--text2);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em}
  .note{font-size:.82rem;color:var(--text2);text-align:center;margin-top:12px}
  .policy{font-size:.9rem;color:var(--text2);line-height:1.6;margin-top:6px}
  .policy .lead{color:var(--text);font-size:1rem;margin-bottom:6px}
  .policy h4{color:var(--text);font-size:.95rem;font-weight:600;margin:16px 0 4px}
  .policy p{margin-bottom:3px}

  /* ---------- FOOTER ---------- */
  footer{background:var(--alt);color:var(--text2);font-size:.78rem;padding:40px 22px}
  .foot-inner{max-width:var(--maxw);margin:0 auto}
  .foot-links{display:flex;flex-wrap:wrap;gap:8px 22px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:18px}
  .foot-links a:hover{text-decoration:underline}

  /* ---------- TOAST ---------- */
  .toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%) translateY(70px);z-index:600;background:rgba(0,0,0,.85);color:#fff;padding:12px 20px;border-radius:980px;font-size:.9rem;opacity:0;transition:.35s var(--ease)}
  .toast.show{transform:translateX(-50%);opacity:1}

  @media(max-width:833px){
    .nav-links{position:fixed;top:48px;left:0;right:0;flex-direction:column;gap:0;background:rgba(255,255,255,.96);backdrop-filter:blur(20px);border-bottom:1px solid var(--line);padding:8px 0;display:none}
    .nav-links.open{display:flex}
    .nav-links a{padding:13px 24px;font-size:1rem;width:100%}
    .burger{display:block}
    .twoup{grid-template-columns:1fr}
  }
  @media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}
  :focus-visible{outline:2px solid var(--blue);outline-offset:2px}

  /* ---------- LOGOS ACCUEIL & CAPTURES ---------- */
  .app-logo{width:200px;height:200px;border-radius:44px;margin:0 auto;box-shadow:0 20px 50px rgba(0,0,0,.18);display:block}
  .half .app-logo{width:150px;height:150px;border-radius:34px}
  .shot-phone{max-width:300px;width:100%;margin:0 auto;border-radius:30px;box-shadow:0 24px 60px rgba(0,0,0,.18);display:block}
  .feature .tile-media{margin-left:auto;margin-right:auto}