/* CalcMate — shared stylesheet. Light theme, teal/blue accent. Mobile-first responsive. */
:root{
  --teal:#0d9488; --teal-dark:#0f766e; --teal-light:#ccfbf1;
  --blue:#2563eb; --blue-dark:#1d4ed8;
  --ink:#1e293b; --muted:#64748b; --line:#e2e8f0;
  --bg:#f8fafc; --card:#ffffff;
  --radius:14px; --shadow:0 6px 24px rgba(15,118,110,.08);
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
img{max-width:100%}
a{color:var(--teal-dark);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.35rem;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--teal),var(--blue));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:1.1rem}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{padding:8px 14px;border-radius:8px;color:var(--ink);font-weight:500;font-size:.95rem}
.nav-links a:hover{background:var(--teal-light);text-decoration:none;color:var(--teal-dark)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:1.2rem;cursor:pointer}

/* Hero */
.hero{background:linear-gradient(135deg,#0f766e 0%,#0d9488 45%,#2563eb 100%);color:#fff;padding:64px 0 72px;text-align:center}
.hero h1{font-size:2.6rem;font-weight:800;letter-spacing:-.5px;margin-bottom:12px}
.hero p{font-size:1.15rem;opacity:.92;max-width:640px;margin:0 auto 26px}
.search-wrap{max-width:520px;margin:0 auto;position:relative}
.search-wrap input{width:100%;padding:14px 18px;border-radius:999px;border:none;font-size:1rem;box-shadow:0 8px 30px rgba(0,0,0,.18)}
.search-wrap input:focus{outline:3px solid rgba(255,255,255,.5)}
.hero-stats{display:flex;gap:28px;justify-content:center;margin-top:26px;flex-wrap:wrap}
.hero-stats div{text-align:center}
.hero-stats strong{display:block;font-size:1.5rem}
.hero-stats span{font-size:.85rem;opacity:.85}

/* Sections */
.section{padding:56px 0}
.section h2{font-size:1.9rem;font-weight:800;margin-bottom:8px;letter-spacing:-.3px}
.section-sub{color:var(--muted);margin-bottom:28px;max-width:680px}
.cat-block{margin-bottom:40px}
.cat-title{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;margin-bottom:16px}
.cat-icon{width:38px;height:38px;border-radius:10px;background:var(--teal-light);display:flex;align-items:center;justify-content:center;font-size:1.2rem}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.calc-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s;display:flex;flex-direction:column}
.calc-card:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(15,118,110,.14)}
.calc-card:hover a.card-link{text-decoration:none}
.calc-card h3{font-size:1.05rem;margin-bottom:8px;color:var(--ink)}
.calc-card p{font-size:.9rem;color:var(--muted);flex:1}
.calc-card .go{margin-top:12px;font-weight:600;color:var(--teal-dark);font-size:.9rem}

/* Features */
.features{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px;margin-top:8px}
.feature{background:var(--bg);border-radius:var(--radius);padding:24px;border:1px solid var(--line)}
.feature .fi{font-size:1.6rem;margin-bottom:10px}
.feature h3{font-size:1.05rem;margin-bottom:6px}
.feature p{font-size:.92rem;color:var(--muted)}

/* Breadcrumb */
.breadcrumb{font-size:.85rem;color:var(--muted);margin:22px 0 6px}
.breadcrumb a{color:var(--teal-dark)}

/* Article */
.article{max-width:860px;margin:0 auto}
.article h1{font-size:2.1rem;font-weight:800;letter-spacing:-.4px;margin:6px 0 12px}
.lede{font-size:1.12rem;color:var(--muted);margin-bottom:24px}
.article h2{font-size:1.45rem;margin:34px 0 12px;font-weight:750}
.article p{margin-bottom:14px}
.article ol.steps,.article ul.bullets{margin:0 0 16px 22px}
.article ol.steps li,.article ul.bullets li{margin-bottom:8px}
.formula-box{background:#f0fdfa;border:1px solid #99f6e4;border-left:4px solid var(--teal);border-radius:10px;padding:16px 18px;margin:16px 0;font-family:ui-monospace,'SF Mono',Menlo,Consolas,monospace;font-size:.95rem}

/* Calculator widget */
.calc-widget{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;margin:22px 0}
.calc-widget h2{margin-top:0 !important}
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px}
.field .hint{font-weight:400;font-size:.82rem;color:var(--muted)}
.field input[type=number],.field input[type=text],.field input[type=date],.field input[type=time],.field input[type=datetime-local],.field select,.field textarea{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:9px;font-size:1rem;font-family:inherit;background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(13,148,136,.15)}
.field textarea{min-height:110px;resize:vertical}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.check-row{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:.95rem}
.check-row input{width:18px;height:18px;accent-color:var(--teal)}
.btn{display:inline-block;background:linear-gradient(135deg,var(--teal),var(--blue));color:#fff;border:none;border-radius:10px;padding:13px 28px;font-size:1rem;font-weight:700;cursor:pointer;transition:filter .15s}
.btn:hover{filter:brightness(1.08)}
.btn-ghost{background:#fff;color:var(--teal-dark);border:1.5px solid var(--teal);margin-left:10px}
.btn-sm{padding:8px 16px;font-size:.88rem}
.result-box{display:none;margin-top:20px;background:#f0fdfa;border:1px solid #99f6e4;border-radius:12px;padding:20px 22px}
.result-box.show{display:block;animation:fadeIn .25s}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.result-box h3{font-size:1.05rem;margin-bottom:12px;color:var(--teal-dark)}
.result-row{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px dashed #99f6e4;font-size:.97rem}
.result-row:last-child{border-bottom:none}
.result-row .k{color:var(--muted)}
.result-row .v{font-weight:700;text-align:right}
.result-row.hero .v{font-size:1.35rem;color:var(--teal-dark)}
.error-box{display:none;margin-top:14px;background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;border-radius:10px;padding:12px 16px;font-size:.93rem}
.error-box.show{display:block}

/* Ad placeholders */
.ad-placeholder{border:2px dashed #cbd5e1;background:#f1f5f9;border-radius:10px;text-align:center;padding:26px 12px;margin:28px auto;color:#94a3b8;font-size:.82rem;letter-spacing:2px;text-transform:uppercase;max-width:860px}
/* Replace .ad-placeholder divs with your AdSense <ins> units after approval. */

/* FAQ */
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-item summary{padding:16px 20px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:1.3rem;color:var(--teal)}
.faq-item[open] summary::after{content:'–'}
.faq-item .faq-a{padding:0 20px 18px;color:var(--muted);font-size:.95rem}

/* Related */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin-top:14px}
.related-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;font-weight:600;font-size:.95rem}
.related-card:hover{border-color:var(--teal);text-decoration:none}
.related-card span{display:block;font-weight:400;font-size:.82rem;color:var(--muted);margin-top:4px}

/* Footer */
.site-footer{background:#0f172a;color:#cbd5e1;margin-top:60px;padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;margin-bottom:30px}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:12px}
.site-footer a{color:#94a3b8;font-size:.9rem;display:block;margin-bottom:8px}
.site-footer a:hover{color:#fff}
.footer-brand{color:#fff;font-weight:800;font-size:1.2rem;margin-bottom:10px;display:block}
.footer-note{font-size:.85rem;color:#64748b}
.footer-bottom{border-top:1px solid #1e293b;padding-top:20px;font-size:.82rem;color:#64748b;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* Contact form */
.contact-form{max-width:620px}
.disclaimer{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:16px 18px;font-size:.9rem;color:#92400e;margin:20px 0}

/* Responsive */
@media(max-width:860px){
  .nav-links{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 20px 18px;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.08)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:2rem}
  .article h1{font-size:1.65rem}
  .field-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .calc-widget{padding:18px}
}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}