/* ═══════════════════════════════════════════════════════════
   tools.css — shared styling for /tools/ calculators and
   /standards/ reference pages. Loaded after css/style.css,
   which supplies the design tokens (--blue, --t1, --fd, .wrap).
   Added 2026-08-20.
   ═══════════════════════════════════════════════════════════ */

.tool-hero{padding:140px 0 44px;background:linear-gradient(180deg,#F8FAFC 0%,#fff 100%);border-bottom:1px solid rgba(0,0,0,.06)}
.tool-crumb{font-size:13px;color:#64748B;margin-bottom:14px}
.tool-crumb a{color:#2563EB;text-decoration:none}
.tool-crumb a:hover{text-decoration:underline}
.tool-tag{display:inline-block;font-size:10px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#2563EB;background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.18);padding:5px 12px;border-radius:99px;margin-bottom:16px}
.tool-hero h1{font-family:var(--fd,Inter);font-size:clamp(30px,4.6vw,46px);font-weight:800;line-height:1.1;letter-spacing:-.02em;color:var(--t1,#0F172A);margin:0 0 16px;max-width:900px}
.tool-hero .lead{font-size:clamp(16px,1.9vw,19px);line-height:1.6;color:#475569;max-width:760px;margin:0}

.tool-sec{padding:56px 0}
.tool-sec.alt{background:#F8FAFC}
.tool-sec h2{font-family:var(--fd,Inter);font-size:clamp(23px,3vw,31px);font-weight:800;letter-spacing:-.015em;color:var(--t1,#0F172A);margin:0 0 14px}
.tool-sec h3{font-size:18px;font-weight:700;color:var(--t1,#0F172A);margin:26px 0 10px}
.tool-sec p{font-size:15.5px;line-height:1.72;color:#475569;margin:0 0 14px;max-width:820px}
.tool-sec ul,.tool-sec ol{font-size:15.5px;line-height:1.75;color:#475569;max-width:820px;padding-left:22px;margin:0 0 16px}
.tool-sec li{margin-bottom:7px}

/* ── Calculator shell ─────────────────────────────────────── */
.calc{background:#fff;border:1px solid rgba(0,0,0,.09);border-radius:16px;box-shadow:0 14px 44px rgba(15,23,42,.07);padding:30px;max-width:960px}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px}
.calc-f{display:flex;flex-direction:column}
.calc-f label{font-size:12.5px;font-weight:700;color:#334155;margin-bottom:6px;letter-spacing:.01em}
.calc-f .hint{font-size:11.5px;color:#94A3B8;font-weight:500;margin-top:5px;line-height:1.45}
.calc-f input,.calc-f select{font-family:inherit;font-size:15px;padding:11px 13px;border:1px solid rgba(0,0,0,.16);border-radius:9px;background:#fff;color:#0F172A;transition:border-color .15s,box-shadow .15s;width:100%}
.calc-f input:focus,.calc-f select:focus{outline:none;border-color:#2563EB;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.calc-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:22px;padding-top:20px;border-top:1px solid rgba(0,0,0,.07)}
.calc-btn{font-family:inherit;font-size:14.5px;font-weight:700;padding:12px 26px;border-radius:9px;border:none;background:#2563EB;color:#fff;cursor:pointer;transition:background .15s,transform .1s}
.calc-btn:hover{background:#1D4ED8}
.calc-btn:active{transform:translateY(1px)}
.calc-btn.ghost{background:#fff;color:#334155;border:1px solid rgba(0,0,0,.16)}
.calc-btn.ghost:hover{background:#F1F5F9}

/* ── Result panel ─────────────────────────────────────────── */
.calc-out{margin-top:24px;background:linear-gradient(135deg,#0F172A 0%,#1E293B 100%);border-radius:14px;padding:26px 28px;color:#fff;display:none}
.calc-out.on{display:block}
.calc-out .out-lbl{font-size:10.5px;font-weight:800;letter-spacing:.15em;text-transform:uppercase;color:#93C5FD;margin-bottom:10px}
.calc-out .out-big{font-family:var(--fd,Inter);font-size:clamp(34px,6vw,52px);font-weight:900;line-height:1;letter-spacing:-.025em;margin-bottom:8px}
.calc-out .out-unit{font-size:16px;font-weight:600;color:#CBD5E1;margin-left:8px}
.calc-out .out-sub{font-size:14px;color:#CBD5E1;line-height:1.6;margin:0}
.calc-rows{margin-top:20px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px}
.calc-row .k{font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:#94A3B8;margin-bottom:4px}
.calc-row .v{font-size:19px;font-weight:800;color:#fff}
.calc-err{margin-top:16px;font-size:14px;color:#DC2626;font-weight:600;display:none}
.calc-err.on{display:block}

/* Verdict pill inside the result panel */
.verdict{display:inline-block;font-size:13px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;padding:7px 16px;border-radius:99px;margin-top:6px}
.verdict.pass{background:rgba(34,197,94,.16);color:#4ADE80;border:1px solid rgba(34,197,94,.35)}
.verdict.warn{background:rgba(245,158,11,.16);color:#FBBF24;border:1px solid rgba(245,158,11,.35)}
.verdict.fail{background:rgba(239,68,68,.16);color:#F87171;border:1px solid rgba(239,68,68,.35)}

/* ── Formula callout ──────────────────────────────────────── */
.formula{background:#0F172A;color:#E2E8F0;border-radius:12px;padding:20px 24px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px;line-height:1.75;overflow-x:auto;margin:16px 0 20px;max-width:820px}
.formula .v{color:#93C5FD}

/* ── Data tables ──────────────────────────────────────────── */
.tool-table-wrap{overflow-x:auto;margin:18px 0 24px;max-width:900px}
.tool-table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:520px}
.tool-table th{text-align:left;font-weight:800;font-size:11.5px;letter-spacing:.09em;text-transform:uppercase;color:#64748B;padding:11px 14px;border-bottom:2px solid rgba(0,0,0,.1);white-space:nowrap}
.tool-table td{padding:12px 14px;border-bottom:1px solid rgba(0,0,0,.06);color:#334155;line-height:1.55}
.tool-table tr:hover td{background:#F8FAFC}

/* ── Tool index cards ─────────────────────────────────────── */
.tool-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(285px,1fr));gap:20px;margin-top:8px}
.tool-card{display:block;background:#fff;border:1px solid rgba(0,0,0,.09);border-radius:14px;padding:24px;text-decoration:none;transition:transform .16s,box-shadow .16s,border-color .16s}
.tool-card:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(15,23,42,.1);border-color:rgba(37,99,235,.3)}
.tool-card h3{font-size:17.5px;font-weight:800;color:var(--t1,#0F172A);margin:0 0 8px}
.tool-card p{font-size:14px;color:#64748B;line-height:1.6;margin:0}
.tool-card .tc-tag{display:inline-block;font-size:9.5px;font-weight:800;letter-spacing:.13em;text-transform:uppercase;color:#2563EB;margin-bottom:10px}

/* ── FAQ ──────────────────────────────────────────────────── */
.tool-faq{max-width:860px}
.tool-faq details{border-bottom:1px solid rgba(0,0,0,.08);padding:16px 0}
.tool-faq summary{font-size:16px;font-weight:700;color:var(--t1,#0F172A);cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:flex-start}
.tool-faq summary::-webkit-details-marker{display:none}
.tool-faq summary::after{content:'+';font-size:21px;font-weight:400;color:#2563EB;line-height:1;flex-shrink:0}
.tool-faq details[open] summary::after{content:'\2212'}
.tool-faq details p{margin-top:11px;font-size:15px;line-height:1.7;color:#475569}

/* ── Inline CTA ───────────────────────────────────────────── */
.tool-cta{background:linear-gradient(135deg,#2563EB 0%,#1D4ED8 100%);border-radius:16px;padding:36px 38px;color:#fff;max-width:900px;margin-top:8px}
.tool-cta h2{color:#fff;font-size:clamp(21px,2.7vw,28px);margin:0 0 12px}
.tool-cta p{color:rgba(255,255,255,.9);font-size:15.5px;line-height:1.68;margin:0 0 20px;max-width:640px}
.tool-cta .btn{display:inline-block;background:#fff;color:#1D4ED8;font-weight:700;font-size:14.5px;padding:12px 26px;border-radius:9px;text-decoration:none;transition:transform .12s}
.tool-cta .btn:hover{transform:translateY(-2px)}

@media(max-width:720px){
  .tool-hero{padding:120px 0 34px}
  .calc{padding:22px}
  .tool-cta{padding:28px 24px}
  .calc-out{padding:22px}
}