:root{
  --navy:#1e3a5f; --navy-dark:#14273f; --navy-soft:#e8eef5;
  --slate:#1e293b; --muted:#5b6b7f; --line:#d7dee7; --bg:#f4f6f9;
  --card:#ffffff; --green:#166534; --red:#b91c1c; --radius:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;
  color:var(--slate);background:var(--bg);line-height:1.6;font-size:16px}
a{color:var(--navy);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}
.site-header{background:var(--navy-dark);border-bottom:3px solid #b08d2f;position:sticky;top:0;z-index:50}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:64px}
.brand{font-weight:800;font-size:1.22rem;color:#fff;display:flex;align-items:center;gap:9px}
.brand .logo{width:32px;height:32px;border-radius:7px;background:#fff;color:var(--navy-dark);
  display:inline-flex;align-items:center;justify-content:center;font-size:17px}
nav.main{display:flex;gap:2px;align-items:center;flex-wrap:wrap}
nav.main a{color:#dbe4ee;font-weight:600;padding:8px 10px;border-radius:7px;font-size:.9rem}
nav.main a:hover{background:rgba(255,255,255,.12);text-decoration:none;color:#fff}
#navToggle{display:none;background:none;border:1px solid rgba(255,255,255,.4);border-radius:8px;
  font-size:1.25rem;padding:5px 12px;cursor:pointer;color:#fff}
.hero{background:linear-gradient(135deg,var(--navy-dark) 0%,var(--navy) 70%);color:#fff;padding:52px 0 60px}
.hero h1{margin:0 0 12px;font-size:2rem;line-height:1.22;letter-spacing:-.01em}
.hero p.sub{opacity:.92;font-size:1.05rem;max-width:660px;margin:0 0 22px}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap;font-size:.85rem}
.hero-badges span{background:rgba(255,255,255,.15);padding:6px 14px;border-radius:999px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:34px 0}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;transition:transform .15s,box-shadow .15s}
.tool-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(20,39,63,.12);text-decoration:none}
.tool-card .icon{font-size:1.9rem;margin-bottom:9px}
.tool-card h3{margin:0 0 7px;font-size:1.12rem;color:var(--slate)}
.tool-card p{margin:0;color:var(--muted);font-size:.93rem}
.tool-hero{background:linear-gradient(135deg,var(--navy-dark),var(--navy));color:#fff;padding:38px 0}
.tool-hero h1{margin:0 0 8px;font-size:1.75rem}
.tool-hero p{margin:0;opacity:.9;max-width:700px}
.calculator{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;margin:-32px 0 30px;box-shadow:0 8px 26px rgba(20,39,63,.09);position:relative}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;margin-bottom:6px;font-size:.95rem}
.field input,.field select{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:8px;
  font-size:1rem;font-family:inherit;background:#fff}
.field input:focus,.field select:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px var(--navy-soft)}
.field .hint{font-size:.85rem;color:var(--muted);margin-top:5px}
.checkline{display:flex;gap:10px;align-items:flex-start;margin:10px 0;font-size:.95rem}
.checkline input{width:19px;height:19px;margin-top:3px;accent-color:var(--navy)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field-row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.btn{background:var(--navy);color:#fff;border:none;border-radius:8px;padding:13px 26px;
  font-size:1rem;font-weight:700;cursor:pointer;width:100%}
.btn:hover{background:var(--navy-dark)}
.result{background:#f0f7f0;border:1.5px solid #bcdcbc;border-radius:10px;padding:18px;margin-top:18px;display:none}
.result.show{display:block}
.result.bad{background:#fdf1f1;border-color:#efc3c3}
.result .big{font-size:1.75rem;font-weight:800;color:var(--navy-dark)}
.result.bad .big{color:var(--red)}
.result .ok{color:var(--green);font-weight:800}
.result .detail{color:#3c4b5e;font-size:.93rem;margin-top:6px}
.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-top:6px}
.stat{background:var(--navy-soft);border-radius:9px;padding:13px 10px;text-align:center}
.stat .num{font-size:1.35rem;font-weight:800;color:var(--navy-dark);line-height:1.25}
.stat .lab{font-size:.79rem;color:var(--muted);font-weight:700;margin-top:3px}
table.datatable{width:100%;border-collapse:collapse;margin-top:10px;font-size:.93rem}
table.datatable th,table.datatable td{border:1px solid var(--line);padding:7px 10px;text-align:left}
table.datatable th{background:var(--navy-soft)}
.section{margin:40px 0}
.section h2{font-size:1.4rem;margin:0 0 14px}
.prose{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.prose h3{margin:22px 0 8px;font-size:1.08rem}
.prose h3:first-child{margin-top:0}
.prose p,.prose li{color:#334155}
.formula{background:var(--navy-soft);border-left:4px solid var(--navy);border-radius:6px;
  padding:12px 16px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.92rem;margin:12px 0;overflow-x:auto}
.notice{background:#fdf8e7;border:1.5px solid #e6d488;border-radius:10px;padding:14px 18px;font-size:.93rem;margin:16px 0}
.faq details{border:1px solid var(--line);border-radius:9px;padding:13px 16px;margin-bottom:10px;background:#fff}
.faq summary{font-weight:700;cursor:pointer}
.site-footer{background:var(--navy-dark);color:#c3cfdd;padding:40px 0;margin-top:60px}
.site-footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.site-footer h4{color:#fff;margin:0 0 12px;font-size:1rem}
.site-footer a{color:#c3cfdd;display:block;margin-bottom:8px;font-size:.93rem}
.site-footer p{font-size:.9rem;margin:0 0 10px}
.bottom-bar{border-top:1px solid #28405e;margin-top:28px;padding-top:18px;font-size:.85rem;color:#8fa3ba}
.crumbs{font-size:.85rem;color:var(--muted);margin:18px 0 0}
.crumbs a{color:var(--muted)}
@media(max-width:820px){
  nav.main{display:none;position:absolute;top:64px;left:0;right:0;background:var(--navy-dark);
    flex-direction:column;align-items:stretch;padding:10px 18px 18px}
  nav.main.open{display:flex}
  nav.main a{padding:12px}
  #navToggle{display:block}
  .hero h1{font-size:1.6rem}
  .field-row,.field-row3{grid-template-columns:1fr}
  .site-footer .wrap{grid-template-columns:1fr}
  .calculator{margin-top:-22px;padding:20px}
}
/* ============ Redesign: slim sticky header, Tools mega-menu, motion, network ============ */
.site-header{box-shadow:0 2px 14px rgba(10,25,47,.28)}
.site-header .wrap{min-height:60px;gap:14px}
.brand{flex:0 0 auto;white-space:nowrap}
.brand .logo{flex:0 0 auto}
nav.main{flex-wrap:nowrap;margin-left:auto;gap:2px}
nav.main>a,.nav-top{display:inline-flex;align-items:center;padding:9px 12px;min-height:44px;white-space:nowrap}
.nav-drop{position:relative}
.caret{font-size:.68rem;margin-left:5px;color:#9db2c8}
.mega{position:absolute;top:calc(100% + 12px);left:50%;transform:translate(-50%,8px);
  width:520px;max-width:88vw;background:#fff;border:1px solid var(--line);border-radius:12px;
  box-shadow:0 24px 50px rgba(20,39,63,.25);padding:12px;z-index:60;
  display:grid;grid-template-columns:1fr 1fr;gap:2px 8px;
  opacity:0;visibility:hidden;transition:opacity .25s ease,transform .25s ease,visibility .25s}
.mega::before{content:"";position:absolute;top:-13px;left:0;right:0;height:13px}
.mega-col{min-width:0}
.nav-drop:hover .mega,.nav-drop:focus-within .mega{opacity:1;visibility:visible;transform:translate(-50%,0)}
.mega a{display:block;padding:9px 12px;border-radius:8px;color:var(--slate);font-weight:600;font-size:.92rem}
.mega a:hover{background:var(--navy-soft);color:var(--navy-dark);text-decoration:none}
/* hero call-to-action (gold, to match the header rule) */
.btn-hero{display:inline-flex;align-items:center;gap:9px;
  background:linear-gradient(135deg,#c9a43a,#b08d2f);color:#14273f;
  font-weight:800;font-size:1.02rem;padding:14px 30px;border-radius:999px;min-height:52px;
  box-shadow:0 12px 26px rgba(10,25,47,.35);transition:transform .25s ease,box-shadow .25s ease;margin:0 0 24px}
.btn-hero:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 18px 34px rgba(10,25,47,.4);text-decoration:none}
/* buttons: navy-to-slate gradient, shine sweep, gentle lift, large tap target */
.btn{background:linear-gradient(135deg,#26507f 0%,var(--navy) 55%,var(--navy-dark) 100%);
  position:relative;overflow:hidden;min-height:50px;
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease}
.btn::after{content:"";position:absolute;top:0;left:-70%;width:45%;height:100%;
  background:linear-gradient(105deg,transparent,rgba(255,255,255,.35),transparent);
  transform:skewX(-20deg);transition:left .5s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(20,39,63,.30);filter:brightness(1.05)}
.btn:hover::after{left:120%}
.btn:active{transform:scale(.99)}
/* tool cards: SVG icon tile + hover lift */
.tool-card{transition:transform .25s ease,box-shadow .25s ease}
.tool-card:hover{transform:translateY(-5px);box-shadow:0 16px 32px rgba(20,39,63,.16)}
.tool-card .icon{width:46px;height:46px;border-radius:10px;font-size:0;margin-bottom:13px;
  display:flex;align-items:center;justify-content:center;color:var(--navy);
  background:var(--navy-soft);border:1px solid var(--line)}
.tool-card .icon svg{width:24px;height:24px;flex:0 0 auto}
/* gentle entrance motion (pure CSS keyframes, kept subtle) */
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.hero h1{animation:rise .5s ease both}
.hero p.sub{animation:rise .5s .07s ease both}
.hero .btn-hero{animation:rise .5s .14s ease both}
.hero-badges{animation:rise .5s .21s ease both}
.tool-hero h1{animation:rise .45s ease both}
.tool-hero p{animation:rise .45s .07s ease both}
.grid .tool-card{animation:rise .5s ease both}
.grid .tool-card:nth-child(2){animation-delay:.05s}
.grid .tool-card:nth-child(3){animation-delay:.10s}
.grid .tool-card:nth-child(4){animation-delay:.15s}
.grid .tool-card:nth-child(5){animation-delay:.20s}
.grid .tool-card:nth-child(6){animation-delay:.25s}
.grid .tool-card:nth-child(7){animation-delay:.30s}
/* cross-link network section (sits directly above the footer) */
.network{margin-top:56px;background:var(--navy-soft);
  border-top:1px solid var(--line);padding:38px 0 42px}
.network h2{font-size:1.28rem;margin:0 0 6px}
.network p{margin:0;color:var(--muted);font-size:.95rem}
.network-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-top:18px}
.network-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;
  font-weight:700;color:var(--slate);display:flex;align-items:center;gap:8px;
  transition:transform .25s ease,box-shadow .25s ease}
.network-card::after{content:"\2192";margin-left:auto;color:var(--muted)}
.network-card:hover{transform:translateY(-3px);box-shadow:0 12px 24px rgba(20,39,63,.14);
  text-decoration:none;color:var(--navy-dark)}
.site-footer{margin-top:0}
@media(max-width:820px){
  .mega{position:static;transform:none;opacity:1;visibility:visible;width:auto;max-width:none;
    box-shadow:none;border:none;background:transparent;padding:2px 0 6px;display:block}
  .mega::before{display:none}
  .mega a{color:#dbe4ee;padding:10px 12px;font-size:.95rem}
  .mega a:hover{background:rgba(255,255,255,.12);color:#fff}
  .nav-top{font-weight:800;color:#fff}
  .btn-hero{width:100%;justify-content:center}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;
    transition-duration:.01ms !important}
  html{scroll-behavior:auto}
}