:root{
  --bg:#0b0f1a;--bg2:#0e1320;--card:#161d2e;--card2:#1b2336;--mut:#8a93a6;--line:#26304a;
  --acc:#4f8cff;--acc2:#36c79b;--txt:#eef2f9;--warn:#ffb454;--err:#ff7b7b;--radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;
  background:linear-gradient(180deg,#0a0e18,#0e1320 50%);color:var(--txt);min-height:100vh;line-height:1.55}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}

/* nav */
header.nav{position:sticky;top:0;z-index:50;background:rgba(11,15,26,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:18px;padding:14px 20px;max-width:1080px;margin:0 auto}
.brand{font-weight:800;font-size:19px;letter-spacing:.3px}.brand b{color:var(--acc)}
.nav-links{display:flex;gap:18px;margin-left:8px;flex-wrap:wrap}
.nav-links a{color:var(--mut);font-size:14px;font-weight:500}.nav-links a:hover,.nav-links a.active{color:var(--txt);text-decoration:none}
.nav-cta{margin-left:auto}
.btn{display:inline-block;background:var(--acc);color:#fff;border:0;border-radius:10px;padding:11px 18px;font-size:14px;font-weight:700;cursor:pointer;transition:.15s}
.btn:hover{filter:brightness(1.08);text-decoration:none}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--txt)}
.btn.lg{padding:14px 26px;font-size:15px}
.menu-toggle{display:none;background:none;border:0;color:var(--txt);font-size:22px;cursor:pointer;margin-left:auto}
@media(max-width:760px){.nav-links{display:none;width:100%;flex-direction:column;gap:10px;padding-top:10px}
  .nav-links.open{display:flex}.nav-cta{display:none}.menu-toggle{display:block}.nav-in{flex-wrap:wrap}}

/* hero / sections */
.hero{padding:64px 0 30px;text-align:center}
h1{font-size:clamp(28px,5vw,44px);margin:0 0 14px;line-height:1.15;letter-spacing:-.5px}
.lead{color:var(--mut);font-size:17px;max-width:620px;margin:0 auto 26px}
.sect{padding:40px 0}
h2{font-size:26px;margin:0 0 18px}h3{font-size:17px;margin:0 0 8px}
.pill{display:inline-block;background:var(--card2);border:1px solid var(--line);color:var(--acc2);font-size:12px;font-weight:600;padding:5px 12px;border-radius:999px;margin-bottom:18px}

/* cards / grids */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.grid{display:grid;gap:16px}
.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:760px){.g3,.g2,.g4{grid-template-columns:1fr}}
.feature b{display:block;margin-bottom:6px;font-size:15px}.feature{color:var(--mut);font-size:14px}
.feature .ic{font-size:22px;margin-bottom:10px;display:block}

/* tool widget */
.tool{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;max-width:640px;margin:0 auto}
.drop{border:2px dashed var(--line);border-radius:12px;padding:38px 20px;text-align:center;cursor:pointer;transition:.15s;background:#121829}
.drop:hover,.drop.over{border-color:var(--acc);background:#13203a}
.drop .big{font-size:16px;font-weight:600}.drop .small{color:var(--mut);font-size:13px;margin-top:6px}
.row{display:flex;gap:16px;flex-wrap:wrap;margin-top:20px}
.field{flex:1;min-width:160px}
label{display:block;font-size:13px;color:var(--mut);margin-bottom:6px}
select,input[type=number],input[type=range]{width:100%}
select,input[type=number]{background:#0f1626;color:var(--txt);border:1px solid var(--line);border-radius:9px;padding:11px 12px;font-size:14px}
.qval{float:right;color:var(--acc2);font-weight:600}
.file{margin-top:14px;font-size:14px;display:none;align-items:center;gap:10px}.file .x{color:var(--mut);cursor:pointer;margin-left:auto}
.status{margin-top:14px;font-size:14px;min-height:20px}.ok{color:var(--acc2)}.err{color:var(--err)}
.tool button.run{margin-top:22px;width:100%}

/* faq / docs */
.faq details{border:1px solid var(--line);border-radius:10px;padding:4px 16px;margin-bottom:10px;background:var(--card)}
.faq summary{cursor:pointer;padding:14px 0;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq p{color:var(--mut);margin:0 0 14px}
pre{background:#0c1220;border:1px solid var(--line);border-radius:10px;padding:16px;overflow:auto;font-size:13px}
code{font-family:ui-monospace,Menlo,Consolas,monospace}
.prose{color:#cdd5e3}.prose h2{margin-top:32px}.prose p,.prose li{color:#cdd5e3}

footer.site{border-top:1px solid var(--line);margin-top:40px;color:var(--mut);font-size:13px}
.foot-in{display:flex;flex-wrap:wrap;gap:30px;padding:34px 20px;max-width:1080px;margin:0 auto}
.foot-col b{color:var(--txt);display:block;margin-bottom:10px;font-size:14px}
.foot-col a{display:block;color:var(--mut);margin-bottom:7px}
.foot-bottom{text-align:center;padding:18px;border-top:1px solid var(--line);color:var(--mut)}
.stat{display:flex;gap:30px;justify-content:center;flex-wrap:wrap;margin-top:28px}
.stat div{text-align:center}.stat .n{font-size:26px;font-weight:800;color:var(--txt)}.stat .l{font-size:13px;color:var(--mut)}