:root{--navy:#071a33;--navy2:#0f2e55;--gold:#f2a900;--ink:#172231;--muted:#5f6d7d;--line:#dbe3ec;--soft:#f6f8fb;--cream:#fffaf0;--blue:#176ca8}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.72}
a{color:#0d5f9c}
img{max-width:100%;height:auto}
.top{background:var(--navy);color:#fff;position:relative;z-index:20}
.nav{max-width:1180px;margin:auto;padding:15px 22px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-weight:800;color:#fff;text-decoration:none;font-size:18px}
.navlinks{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.navlinks a{color:#fff;text-decoration:none;font-weight:700;font-size:15px}
.navlinks a:hover,.navlinks a[aria-current="page"]{color:var(--gold)}
.hero{background:linear-gradient(135deg,#f2f6fa 0%,#fffaf0 100%);border-bottom:1px solid #e2e8ef}
.hero-inner{max-width:1160px;margin:auto;padding:58px 22px;display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center}
.eyebrow{color:#8d6100;font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:12px}
h1{font-size:46px;line-height:1.07;margin:10px 0 16px;color:var(--navy);letter-spacing:-.025em}
.dek{font-size:19px;color:#465568;max-width:760px;margin:0 0 18px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.btn{display:inline-block;border-radius:9px;padding:12px 17px;text-decoration:none;font-weight:800}
.btn-primary{background:var(--navy);color:#fff}
.btn-secondary{background:#fff;border:1px solid #cfd8e4;color:var(--navy)}
.hero-img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:18px;border:1px solid #dce4ed;background:#fff;box-shadow:0 14px 34px rgba(7,26,51,.09)}
main{max-width:1060px;margin:0 auto;padding:46px 22px 84px}
.breadcrumbs{font-size:14px;color:#6b7788;margin-bottom:10px}
.breadcrumbs a{color:#51677f}
h2{color:var(--navy);font-size:31px;line-height:1.2;margin:44px 0 14px}
h3{color:var(--navy);font-size:22px;margin-top:28px}
p{margin:0 0 17px}
.quick-answer{border:1px solid #e5d6ad;background:var(--cream);border-radius:14px;padding:20px 22px;margin:0 0 30px;font-size:16px}
.quick-answer strong{color:#805600}
.tool-shell{display:grid;grid-template-columns:minmax(0,1fr) minmax(310px,.8fr);gap:24px;align-items:start;margin:14px 0 40px}
.panel{border:1px solid var(--line);border-radius:16px;background:#fff;padding:25px;box-shadow:0 8px 24px rgba(7,26,51,.05)}
.panel h2{font-size:24px;margin:0 0 16px}
.field{margin-bottom:15px}
.field label{display:block;font-weight:700;margin-bottom:6px;color:#28384b}
.field small{display:block;color:#6d7887;margin-top:4px;font-size:13px}
input[type=number]{width:100%;padding:12px 13px;border:1px solid #cbd5df;border-radius:8px;font-size:16px;background:#fff}
.calc-actions{display:grid;grid-template-columns:1fr 120px;gap:10px;margin-top:8px}
button.primary,button.reset-btn{border-radius:9px;font-weight:800;padding:13px 16px;font-size:16px;cursor:pointer}
button.primary{border:0;background:var(--navy);color:#fff}
button.primary:hover{background:var(--navy2)}
button.reset-btn{border:1px solid #bfcbd7;background:#fff;color:var(--navy)}
button.reset-btn:hover{background:#eef3f7}
.results{background:#f8fafc;position:sticky;top:18px}
.result-row{display:flex;justify-content:space-between;gap:18px;border-bottom:1px solid #e3e9ef;padding:11px 0}
.result-row:last-child{border-bottom:0}
.result-row strong{color:var(--navy);text-align:right}
.notice{border-left:4px solid var(--gold);background:#fff8e8;padding:13px 15px;border-radius:9px;margin:15px 0}
.steps{list-style:none;counter-reset:step;padding:0}
.steps li{counter-increment:step;margin:14px 0;padding-left:43px;position:relative}
.steps li:before{content:counter(step);position:absolute;left:0;top:2px;width:29px;height:29px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800}
.guide-section{padding:4px 0 2px}
.guide-section p{font-size:16px}
.content-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0}
.content-card{border:1px solid var(--line);border-radius:14px;padding:20px;background:#fff}
.content-card h3{margin-top:0}
.example-box{background:#f7fafc;border:1px solid var(--line);border-radius:14px;padding:22px;margin:22px 0}
.example-box h3{margin-top:0}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;margin:14px 0}
th,td{text-align:left;border-bottom:1px solid #e2e7ec;padding:10px 8px;vertical-align:top}
th{color:var(--navy)}
.embed-box{border:1px solid var(--line);border-radius:14px;background:var(--soft);padding:22px;margin:32px 0}
.embed-box textarea{width:100%;min-height:130px;border:1px solid #cbd5df;border-radius:8px;padding:12px;font-family:Consolas,monospace;font-size:13px;background:#fff}
.copy-btn{margin-top:10px;background:var(--blue);color:#fff;border:0;border-radius:8px;padding:10px 14px;font-weight:800;cursor:pointer}
.recommended{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:18px 0}
.rec-card{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff;text-decoration:none;color:var(--ink)}
.rec-card:hover{box-shadow:0 8px 20px rgba(7,26,51,.08)}
.rec-card strong{display:block;color:var(--navy);margin-bottom:6px}
.rec-card span{font-size:14px;color:var(--muted)}
.related-tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:16px}
.related-tools a{border:1px solid var(--line);border-radius:12px;padding:15px;text-decoration:none;color:var(--navy);font-weight:800;background:#fff}
.faq details{border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:12px 0;background:#fff}
.faq summary{font-weight:800;cursor:pointer;color:var(--navy)}
.cta{background:var(--navy);color:#fff;border-radius:16px;padding:30px;margin:46px 0}
.cta h2{color:#fff;margin-top:0}
.cta a{display:inline-block;background:var(--gold);color:#15202c;padding:13px 18px;border-radius:8px;text-decoration:none;font-weight:800}
.hub-intro{max-width:860px;margin:0 auto 30px}
.hub-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.tool-card{border:1px solid var(--line);border-radius:17px;overflow:hidden;background:#fff;box-shadow:0 8px 24px rgba(7,26,51,.05);display:flex;flex-direction:column}
.tool-card img{width:100%;aspect-ratio:16/9;object-fit:cover;background:#fff;border-bottom:1px solid var(--line)}
.tool-card .pad{padding:21px;display:flex;flex-direction:column;flex:1}
.tool-card h2{font-size:24px;margin:0 0 8px}
.tool-card p{color:var(--muted);margin:0 0 17px}
.tool-card .read-btn{margin-top:auto;display:inline-block;background:var(--navy);color:#fff;padding:11px 14px;border-radius:8px;text-decoration:none;font-weight:800;text-align:center}
.tool-card .read-btn:hover{background:var(--navy2)}
.hub-guide{margin-top:52px}
.keyword-note{font-size:13px;color:#687486;margin-top:16px}
footer{background:var(--navy);color:#dce5ef;padding:30px 22px;text-align:center}
footer a{color:#fff}
@media(max-width:840px){
 .hero-inner,.tool-shell,.content-grid{grid-template-columns:1fr}
 .hub-grid,.recommended,.related-tools{grid-template-columns:1fr}
 h1{font-size:37px}
 .results{position:static}
 .nav{align-items:flex-start}
 .navlinks{font-size:14px;gap:12px}
}
@media(max-width:520px){.calc-actions{grid-template-columns:1fr}}