:root{
  --ink:#071b2e;
  --muted:#5d6f7d;
  --line:rgba(7,27,46,.16);
  --paper:#f4f7f8;
  --panel:rgba(255,255,255,.62);
  --accent:#174b66;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.6;
}
a{color:inherit;text-decoration:none}
.tool-header{
  min-height:68px;
  padding:18px clamp(20px,4vw,56px);
  display:flex;
  align-items:center;
  justify-content:space-between;
  border-bottom:1px solid var(--line);
}
.tool-header .brand{font-weight:800;letter-spacing:-.04em;font-size:1.25rem}
.tool-header nav{display:flex;gap:18px;font-size:.86rem;letter-spacing:.03em}
.tool-header nav a{border-bottom:1px solid transparent}
.tool-header nav a:hover{border-color:var(--ink)}
.tool-main{max-width:1100px;margin:0 auto;padding:clamp(48px,8vw,96px) clamp(20px,4vw,56px) 80px}
.tool-hero{max-width:850px;margin-bottom:68px}
.kicker{font-size:.72rem;font-weight:800;letter-spacing:.17em;text-transform:uppercase;color:var(--muted);margin:0 0 16px}
h1{font-size:clamp(3rem,8vw,6.4rem);line-height:.9;letter-spacing:-.075em;margin:0 0 28px;font-weight:800}
.lead{font-size:clamp(1.2rem,2.3vw,1.65rem);line-height:1.35;max-width:760px;margin:0;color:#1b3345}
.tool-meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin:28px 0 0;color:var(--muted);font-size:.86rem}
.tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.button{display:inline-flex;align-items:center;gap:8px;padding:12px 16px;border:1px solid var(--ink);font-size:.84rem;font-weight:750;letter-spacing:.02em}
.button.primary{background:var(--ink);color:white}
.button:hover{transform:translateY(-1px)}
.tool-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(260px,.85fr);gap:clamp(28px,6vw,72px);align-items:start}
.tool-section{padding:30px 0;border-top:1px solid var(--line)}
.tool-section:first-child{border-top:none;padding-top:0}
.tool-section h2{font-size:clamp(1.6rem,3vw,2.35rem);line-height:1.05;letter-spacing:-.045em;margin:0 0 15px}
.tool-section p{margin:0 0 14px;max-width:740px}
.tool-section ul{padding-left:1.2rem;margin:10px 0 0}
.tool-section li{margin:7px 0}
.model-list{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.model-item{background:var(--paper);padding:17px 18px}
.model-item strong{display:block;margin-bottom:4px}
.model-item span{color:var(--muted);font-size:.92rem}
.side-card{position:sticky;top:24px;border:1px solid var(--line);background:var(--panel);padding:24px}
.side-card h3{margin:0 0 12px;font-size:1.05rem}
.side-card p{font-size:.9rem;color:var(--muted);margin:0 0 18px}
.side-card .button{width:100%;justify-content:center}
.note{border-left:3px solid var(--accent);padding:2px 0 2px 16px;color:#294557}
.tool-footer{max-width:1100px;margin:0 auto;padding:28px clamp(20px,4vw,56px) 42px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:.8rem}
.tool-footer a{color:#294557;font-weight:600;border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease,transform .2s ease}
.tool-footer a:hover{color:var(--ink);border-color:rgba(7,27,46,.35);transform:translateX(-2px)}
@media(max-width:760px){
  .tool-header nav a:first-child{display:none}
  .tool-grid{grid-template-columns:1fr}
  .side-card{position:static}
  .tool-footer{flex-direction:column}
}