:root{
  --teal:#0f766e; --teal-dark:#115e59; --teal-bright:#0d9488; --teal-soft:#f0fdfa;
  --ink:#123332; --muted:#5b7371; --line:#d7e8e5; --bg:#f6fbfa;
  --card:#ffffff; --ok:#0e7a4f; --warn:#b91c1c; --warn-bg:#fef2f2; --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;
  color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}
/* header */
.site-header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:60;
  box-shadow:0 4px 18px rgba(18,51,50,.08)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.brand{font-weight:800;font-size:1.25rem;color:var(--ink);display:flex;align-items:center;gap:9px;
  flex:0 0 auto;white-space:nowrap}
.brand .logo{width:34px;height:34px;flex:0 0 auto;border-radius:10px;background:linear-gradient(135deg,var(--teal),#2dd4bf);
  display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:19px}
nav.main{display:flex;gap:2px;align-items:center}
nav.main>a{color:var(--ink);font-weight:600;padding:10px 12px;border-radius:10px;font-size:.95rem;white-space:nowrap}
nav.main>a:hover{background:var(--teal-soft);text-decoration:none;color:var(--teal-dark)}
.nav-drop{position:relative}
.nav-drop-btn{background:none;border:none;color:var(--ink);font:inherit;font-weight:600;font-size:.95rem;
  padding:10px 12px;border-radius:10px;cursor:pointer;display:flex;align-items:center;gap:6px;min-height:44px}
.nav-drop-btn:hover,.nav-drop.open .nav-drop-btn{background:var(--teal-soft);color:var(--teal-dark)}
.nav-drop-btn .caret{font-size:.7rem;transition:transform .25s ease}
.nav-drop.open .nav-drop-btn .caret{transform:rotate(180deg)}
.nav-drop-panel{display:none;position:absolute;top:calc(100% + 10px);right:0;width:560px;max-width:88vw;
  grid-template-columns:1fr 1fr;gap:2px;background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:10px;box-shadow:0 24px 50px rgba(18,51,50,.18)}
.nav-drop.open .nav-drop-panel{display:grid}
.nav-drop-panel a{color:var(--ink);font-weight:600;font-size:.92rem;padding:10px 12px;border-radius:9px;line-height:1.35}
.nav-drop-panel a:hover{background:var(--teal-soft);color:var(--teal-dark);text-decoration:none}
#navToggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;font-size:1.3rem;
  padding:6px 12px;cursor:pointer;color:var(--ink);min-width:44px;min-height:44px;flex:0 0 auto}
/* hero */
.hero{background:linear-gradient(120deg,#115e59 0%,#0f766e 55%,#0d9488 100%);color:#fff;padding:56px 0 64px}
.hero h1{margin:0 0 12px;font-size:2.1rem;line-height:1.2;letter-spacing:-.02em}
.hero p.sub{opacity:.93;font-size:1.08rem;max-width:660px;margin:0 0 24px}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap;font-size:.85rem}
.hero-badges span{background:rgba(255,255,255,.16);padding:6px 14px;border-radius:999px}
.hero-cta{margin:26px 0 22px}
.btn-hero{display:inline-flex;align-items:center;gap:10px;background:linear-gradient(135deg,var(--teal-bright),var(--teal-dark));
  color:#fff;font-weight:800;font-size:1.05rem;padding:15px 34px;border-radius:14px;min-height:52px;
  border:1px solid rgba(255,255,255,.45);box-shadow:0 10px 26px rgba(9,60,55,.35);
  transition:transform .25s ease,box-shadow .25s ease;position:relative;overflow:hidden}
.btn-hero:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 16px 34px rgba(9,60,55,.45);
  text-decoration:none;color:#fff}
.btn-hero::after{content:"";position:absolute;top:0;left:-80%;width:45%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.45),transparent);
  transform:skewX(-20deg);transition:left .5s ease}
.btn-hero:hover::after{left:135%}
/* tool cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin:36px 0;scroll-margin-top:84px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;display:block}
.tool-card:hover{transform:translateY(-5px);box-shadow:0 16px 34px rgba(15,118,110,.20);
  border-color:#5eead4;text-decoration:none}
.tool-card .icon{width:52px;height:52px;border-radius:14px;margin-bottom:14px;
  background:linear-gradient(135deg,var(--teal-bright),var(--teal-dark));color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 14px rgba(15,118,110,.28)}
.tool-card .icon svg{width:28px;height:28px;display:block}
.tool-card h3{margin:0 0 8px;font-size:1.15rem;color:var(--ink)}
.tool-card p{margin:0;color:var(--muted);font-size:.94rem}
/* tool page layout */
.tool-hero{background:linear-gradient(120deg,#115e59,#0d9488);color:#fff;padding:40px 0}
.tool-hero h1{margin:0 0 8px;font-size:1.8rem;letter-spacing:-.02em}
.tool-hero p{margin:0;opacity:.92;max-width:700px}
.calculator{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;margin:-34px 0 30px;box-shadow:0 10px 30px rgba(18,51,50,.09);position:relative}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;margin-bottom:6px;font-size:.95rem}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;
  font-size:1rem;font-family:inherit;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px var(--teal-soft)}
.field textarea{min-height:120px;resize:vertical}
.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:linear-gradient(135deg,var(--teal-bright),var(--teal-dark));color:#fff;border:none;
  border-radius:12px;padding:14px 26px;font-size:1rem;font-weight:700;cursor:pointer;width:100%;min-height:50px;
  box-shadow:0 8px 20px rgba(15,118,110,.26);transition:transform .25s ease,box-shadow .25s ease;
  position:relative;overflow:hidden}
.btn:hover{transform:translateY(-1px) scale(1.01);box-shadow:0 12px 26px rgba(15,118,110,.36)}
.btn::after{content:"";position:absolute;top:0;left:-80%;width:45%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.40),transparent);
  transform:skewX(-20deg);transition:left .5s ease}
.btn:hover::after{left:135%}
.btn-ghost{background:var(--teal-soft);color:var(--teal-dark)}
.result{background:#f0fdf7;border:1.5px solid #a7e8c9;border-radius:12px;padding:18px;margin-top:18px;display:none}
.result.show{display:block}
.result .big{font-size:1.9rem;font-weight:800;color:var(--ok)}
.result .detail{color:var(--muted);font-size:.92rem;margin-top:6px}
.alert{background:var(--warn-bg);border:1.5px solid #fecaca;border-radius:12px;padding:16px 18px;margin:18px 0;color:#7f1d1d}
.alert strong{color:var(--warn)}
.notebox{background:#fffbeb;border:1.5px solid #fde68a;border-radius:12px;padding:16px 18px;margin:18px 0;color:#713f12}
.tabs{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.tabs button{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:9px 18px;
  font-weight:700;cursor:pointer;font-size:.92rem;color:var(--ink)}
.tabs button.active{background:var(--teal);border-color:var(--teal);color:#fff}
.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:4px}
.stat{background:var(--teal-soft);border-radius:12px;padding:14px 10px;text-align:center}
.stat .num{font-size:1.4rem;font-weight:800;color:var(--teal-dark);line-height:1.2}
.stat .lab{font-size:.8rem;color:var(--muted);font-weight:700;margin-top:3px}
table.datatable{width:100%;border-collapse:collapse;margin-top:10px;font-size:.95rem}
table.datatable th,table.datatable td{border:1px solid var(--line);padding:8px 10px;text-align:left}
table.datatable th{background:var(--teal-soft)}
.plan-row{display:grid;grid-template-columns:2fr 1fr auto;gap:10px;margin-bottom:10px;align-items:end}
.plan-row .field{margin-bottom:0}
/* content sections */
.section{margin:40px 0}
.section h2{font-size:1.45rem;margin:0 0 14px;letter-spacing:-.01em}
.prose{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.prose h3{margin:22px 0 8px;font-size:1.1rem}
.prose h3:first-child{margin-top:0}
.prose p,.prose li{color:#334155}
.faq details{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px;background:#fff}
.faq summary{font-weight:700;cursor:pointer}
/* footer */
.site-footer{background:#0b2e2b;color:#bfe3de;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:#bfe3de;display:block;margin-bottom:8px;font-size:.93rem}
.site-footer p{font-size:.9rem;margin:0 0 10px}
.bottom-bar{border-top:1px solid #14524c;margin-top:28px;padding-top:18px;font-size:.85rem;color:#8fbdb7}
/* breadcrumbs */
.crumbs{font-size:.85rem;color:var(--muted);margin:18px 0 0}
.crumbs a{color:var(--muted)}
@media(max-width:760px){
  #navToggle{display:block}
  nav.main{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;
    flex-direction:column;align-items:stretch;padding:10px 18px 18px;border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px rgba(18,51,50,.16);max-height:calc(100vh - 65px);overflow:auto}
  nav.main.open{display:flex}
  nav.main>a{padding:13px 12px}
  .nav-drop-btn{width:100%;justify-content:space-between;padding:13px 12px}
  nav.main .nav-drop-panel{display:grid;position:static;width:auto;max-width:none;grid-template-columns:1fr;
    background:transparent;border:none;box-shadow:none;padding:0 0 6px}
  .nav-drop-panel a{padding:11px 12px 11px 24px}
  .hero h1{font-size:1.65rem}
  .field-row,.field-row3{grid-template-columns:1fr}
  .plan-row{grid-template-columns:1fr}
  .site-footer .wrap{grid-template-columns:1fr}
  .calculator{margin-top:-24px;padding:20px}
}
@media print{
  .site-header,.site-footer,.network,.tool-hero,.crumbs,.no-print,.tabs{display:none !important}
  body{background:#fff}
  .calculator{box-shadow:none;border:none;margin:0;padding:0}
  .result{display:block !important;border-color:#999}
}
/* network cross-links */
.network{background:var(--teal-soft);border-top:1px solid var(--line);padding:38px 0;margin-top:60px}
.network + .site-footer{margin-top:0}
.network h2{font-size:1.2rem;margin:0 0 8px;text-align:center;letter-spacing:-.01em}
.network p{margin:0 0 18px;text-align:center;color:var(--muted);font-size:.94rem}
.network-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.network-row a{border:1.5px solid var(--line);background:#fff;color:var(--ink);font-weight:700;
  padding:10px 18px;border-radius:999px;min-height:44px;display:inline-flex;align-items:center;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease,color .25s ease}
.network-row a:hover{transform:translateY(-2px);border-color:var(--teal-bright);color:var(--teal-dark);
  box-shadow:0 8px 20px rgba(15,118,110,.16);text-decoration:none}
/* entrance motion */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.rv{animation:fadeUp .7s cubic-bezier(.22,.61,.36,1) both}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;
    transition-duration:.01ms !important}
  html{scroll-behavior:auto}
}