:root{
  --bg:#0b1220;
  --bg-soft:#121c30;
  --panel:#13203a;
  --panel-2:#172743;
  --line:#27405f;
  --text:#e8f0ff;
  --muted:#9db1cc;
  --accent:#4db6ff;
  --accent-2:#7ef0c4;
  --danger:#ff8f8f;
  --warning:#ffd479;
  --shadow:0 14px 40px rgba(0,0,0,.28);
  --radius:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,Segoe UI,Arial,sans-serif;
  background:
    radial-gradient(circle at top right, rgba(77,182,255,.12), transparent 28%),
    radial-gradient(circle at bottom left, rgba(126,240,196,.09), transparent 24%),
    linear-gradient(180deg,#09111d 0%, #0e1628 100%);
  color:var(--text);
}
a{color:inherit;text-decoration:none}
.container{width:min(1320px,calc(100% - 32px));margin:0 auto}
.topbar{
  position:sticky;top:0;z-index:30;
  backdrop-filter: blur(10px);
  background:rgba(8,14,25,.82);
  border-bottom:1px solid rgba(255,255,255,.06)
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:76px
}
.brand{
  display:flex;align-items:center;gap:14px;font-weight:800;font-size:22px;letter-spacing:.3px
}
.brand-badge{
  width:40px;height:40px;border-radius:14px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#08111f;font-weight:900;box-shadow:var(--shadow)
}
.nav-toggle{
  display:none;border:1px solid var(--line);background:var(--panel);color:var(--text);
  border-radius:12px;padding:10px 12px;font-weight:700
}
.nav-links{display:flex;flex-wrap:wrap;gap:10px}
.nav-links a{
  padding:10px 12px;border-radius:12px;color:var(--muted);font-size:14px;
  border:1px solid transparent
}
.nav-links a:hover,.nav-links a.active{
  color:var(--text);background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.08)
}

.hero{padding:34px 0 18px}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px}
.card{
  background:linear-gradient(180deg,rgba(19,32,58,.95),rgba(16,27,48,.92));
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)
}
.hero-main{padding:28px}
.hero-main h1{margin:0 0 10px;font-size:clamp(32px,4vw,54px);line-height:1.05}
.hero-main p{margin:0 0 12px;color:var(--muted);font-size:17px;max-width:800px}
.badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.08);
  background:rgba(255,255,255,.03);color:#dfe8f8;font-size:13px
}
.ad-slot{
  position:relative;display:grid;place-items:center;text-align:center;
  min-height:100px;border:1px dashed rgba(255,255,255,.2);border-radius:18px;
  background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,.01));
  color:var(--muted)
}
.ad-slot::before{
  content:"Ad space";
  position:absolute;top:10px;left:12px;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:#89a3c3
}
.ad-slot.tall{min-height:320px}
.hero-side{padding:18px;display:grid;gap:18px}
.side-list{display:grid;gap:10px}
.side-list a{
  padding:12px 14px;border-radius:14px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);
  color:#dfe8f8;font-size:14px
}
.side-list a:hover{border-color:#41658d;background:rgba(77,182,255,.08)}

.page{padding:10px 0 50px}
.page-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:22px}
.content{display:grid;gap:22px}
.section{padding:24px}
.section h2{margin:0 0 16px;font-size:28px}
.section h3{margin:0 0 12px;font-size:18px}
.section p,.section li{color:var(--muted)}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.field label{
  display:block;margin:0 0 7px;font-size:14px;color:#dfe8f8
}
.field input,.field select{
  width:100%;padding:14px 15px;border-radius:14px;font-size:15px;
  border:1px solid #305177;background:#0d172a;color:var(--text);outline:none
}
.field input:focus,.field select:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(77,182,255,.12)}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.btn{
  border:none;border-radius:14px;padding:13px 16px;font-weight:800;font-size:15px;cursor:pointer
}
.btn-primary{background:linear-gradient(135deg,var(--accent),#7ad0ff);color:#08111f}
.btn-secondary{background:#182640;color:var(--text);border:1px solid #355273}
.btn:hover{transform:translateY(-1px)}
.result-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.metric{
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);
  padding:16px;border-radius:18px
}
.metric .k{font-size:12px;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.06em}
.metric .v{font-size:26px;font-weight:800}
.notice{
  margin-top:10px;min-height:22px;color:var(--danger);font-size:14px
}
.formula{
  background:#0d172a;border:1px solid rgba(255,255,255,.08);padding:18px;border-radius:18px;
  font-family:ui-monospace,SFMono-Regular,Consolas,monospace;color:#d9f1ff;overflow:auto
}
.foot{
  padding:28px 0 50px;border-top:1px solid rgba(255,255,255,.06);color:var(--muted)
}
.sidebar{display:grid;gap:22px}
.tool-menu{padding:18px}
.tool-menu h3{margin:0 0 14px}
.tool-menu .menu-list{display:grid;gap:8px}
.tool-menu .menu-list a{
  padding:11px 12px;border-radius:12px;background:rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.06);font-size:14px;color:#dfe8f8
}
.tool-menu .menu-list a.active{border-color:rgba(77,182,255,.5);background:rgba(77,182,255,.08)}
.kpis{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:10px}
.kpi{padding:14px;border-radius:18px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.07)}
.kpi strong{display:block;font-size:24px;margin-bottom:4px}
.home-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.tool-card{
  padding:20px;border-radius:18px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08)
}
.tool-card h3{margin:0 0 8px}
.tool-card p{margin:0 0 14px}
.meta{display:flex;gap:10px;flex-wrap:wrap}
.meta span{font-size:12px;padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.06);color:var(--muted)}

@media (max-width: 1100px){
  .hero-grid,.page-grid{grid-template-columns:1fr}
  .sidebar{order:-1}
}
@media (max-width: 820px){
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;left:16px;right:16px;top:72px;flex-direction:column;background:#0b1323;padding:12px;border-radius:18px;border:1px solid var(--line)}
  .nav-links.show{display:flex}
  .grid-2,.result-grid,.home-grid,.kpis{grid-template-columns:1fr}
  .hero-main{padding:22px}
}