/* Engineering calculator pages (/engineering-calculators/, /calculators/fit-mtbf/, /calculators/pfd-rrf-sil/).
   Markup: tools/landing/engineering-calculators.js. Runtime: assets/calc/ui.js. */
.cx-page{
  --cx-ink:#10213a;--cx-muted:#4f6276;--cx-line:#d9e1ea;--cx-soft:#f4f7fa;--cx-navy:#14213d;--cx-deep:#071225;--cx-gold:#fca311;
  --cx-blue:#1d4ed8;--cx-ok:#0b6b4c;--cx-ok-bg:#e7f5ee;--cx-warn:#8a5a00;--cx-warn-bg:#fdf3df;--cx-bad:#a12a3e;--cx-bad-bg:#fbecef;--cx-info:#1d4ed8;--cx-info-bg:#eaf1ff;
  --cx-mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;--cx-title:Sora,Manrope,ui-sans-serif,sans-serif;
  background:#f7f9fb
}
.cx-main{display:block;color:var(--cx-ink);font-family:Manrope,ui-sans-serif,system-ui,sans-serif;font-size:16px;line-height:1.6;padding-bottom:24px}
.cx-wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.cx-main h1,.cx-main h2,.cx-main h3{font-family:var(--cx-title);letter-spacing:-.02em;color:var(--cx-ink)}
.cx-main a{color:var(--cx-blue);text-underline-offset:2px}

/* Breadcrumb and title */
.cx-crumbs ol{display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:22px 0 0;list-style:none;font-size:13px;color:var(--cx-muted)}
.cx-crumbs li+li::before{content:"/";margin-right:6px;color:#9aabbd}
.cx-crumbs a{color:var(--cx-muted);text-decoration:none}
.cx-crumbs a:hover{color:var(--cx-ink);text-decoration:underline}
.cx-hero{max-width:780px;padding:14px 0 22px}
.cx-kicker{margin:0 0 8px;font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:#6a7d91}
.cx-hero h1{margin:0 0 10px;font-size:clamp(28px,3.6vw,40px);line-height:1.12;font-weight:600}
.cx-lede{margin:0;font-size:17px;color:var(--cx-muted)}
.cx-hero-hub{padding-bottom:12px}
.cx-hero-hub h1{font-size:clamp(32px,4.4vw,48px)}

/* Calculator: inputs and result side by side; stacked on narrow screens */
.cx-tool{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:20px;align-items:start}
.cx-card{background:#fff;border:1px solid var(--cx-line);border-radius:16px;box-shadow:0 1px 2px rgba(16,33,58,.04),0 12px 32px rgba(16,33,58,.06)}
.cx-inputs{padding:22px 22px 18px;margin:0}
.cx-output{position:sticky;top:96px;padding:22px;overflow:hidden}
.cx-output::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--cx-gold),#ffcf70)}

.cx-presets{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 18px}
.cx-presets-k{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#6a7d91;margin-right:2px}
.cx-chip{appearance:none;border:1px solid var(--cx-line);background:var(--cx-soft);color:var(--cx-ink);border-radius:999px;padding:5px 12px;font:600 13px/1.4 Manrope,ui-sans-serif,sans-serif;cursor:pointer;transition:border-color .15s,background .15s}
.cx-chip:hover{border-color:#9fb3c8;background:#fff}

.cx-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 14px}
.cx-field{grid-column:1/-1;min-width:0;margin:0;padding:0;border:0}
.cx-field.cx-half{grid-column:span 1}
.cx-field[hidden],.cx-adv[hidden]{display:none}
.cx-label{display:block;margin:0 0 6px;padding:0;font-size:14px;font-weight:600;color:var(--cx-ink)}
.cx-control{display:flex;align-items:stretch;min-width:0;border:1px solid #c5d2df;border-radius:10px;background:#fff;transition:border-color .15s,box-shadow .15s}
.cx-control:focus-within{border-color:var(--cx-navy);box-shadow:0 0 0 3px rgba(252,163,17,.35)}
.cx-control input,.cx-control select{min-width:0;border:0;background:transparent;color:var(--cx-ink);font-size:17px;outline:none}
.cx-control input{flex:1 1 auto;width:100%;padding:11px 12px;font-family:var(--cx-mono);font-variant-numeric:tabular-nums}
.cx-control input[aria-invalid="true"]{color:var(--cx-bad)}
.cx-control:has(input[aria-invalid="true"]){border-color:var(--cx-bad);box-shadow:0 0 0 3px rgba(161,42,62,.12)}
.cx-suffix{display:flex;align-items:center;padding:0 12px;border-left:1px solid #e3eaf1;background:var(--cx-soft);border-radius:0 10px 10px 0;color:var(--cx-muted);font-size:14px;font-weight:600;white-space:nowrap}
.cx-unit-select{flex:0 0 auto;max-width:56%;padding:0 30px 0 12px;border-left:1px solid #e3eaf1!important;background:var(--cx-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%234f6276' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center!important;border-radius:0 10px 10px 0;font:600 14px Manrope,ui-sans-serif,sans-serif!important;color:var(--cx-ink);appearance:none;cursor:pointer}
.cx-select{width:100%;padding:11px 36px 11px 12px;appearance:none;font:600 15px Manrope,ui-sans-serif,sans-serif!important;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%234f6276' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 12px center!important;cursor:pointer}
.cx-hint{margin:6px 0 0;font-size:13px;line-height:1.45;color:var(--cx-muted)}
.cx-error{margin:6px 0 0;font-size:13px;line-height:1.45;font-weight:600;color:var(--cx-bad)}
.cx-error[hidden]{display:none}

/* Segmented control (radio group) */
.cx-seg{display:flex;flex-wrap:wrap;gap:4px;padding:4px;border-radius:12px;background:#edf2f7;border:1px solid #e1e8ef}
.cx-seg-opt{position:relative;flex:1 1 auto;min-width:0}
.cx-seg-opt input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.cx-seg-opt span{display:block;padding:8px 12px;border-radius:9px;text-align:center;font-size:14px;font-weight:600;color:var(--cx-muted);white-space:nowrap;transition:background .15s,color .15s,box-shadow .15s}
.cx-seg-opt input:checked+span{background:#fff;color:var(--cx-ink);box-shadow:0 1px 3px rgba(16,33,58,.14)}
.cx-seg-opt input:focus-visible+span{outline:2px solid var(--cx-navy);outline-offset:1px}

.cx-adv{grid-column:1/-1;margin-top:18px;border-top:1px dashed var(--cx-line);padding-top:12px}
.cx-adv>summary{cursor:pointer;width:max-content;max-width:100%;font-size:14px;font-weight:700;color:var(--cx-navy);list-style:none;padding:4px 0}
.cx-adv>summary::-webkit-details-marker{display:none}
.cx-adv>summary::before{content:"+";display:inline-block;width:18px;font-family:var(--cx-mono)}
.cx-adv[open]>summary::before{content:"−"}
.cx-adv>.cx-grid{margin-top:12px}

/* Result */
.cx-result{min-height:176px}
.cx-result-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px}
.cx-result-label{font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#6a7d91}
.cx-status{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700;line-height:1.5}
.cx-status.is-ok{color:var(--cx-ok);background:var(--cx-ok-bg)}
.cx-status.is-warn{color:var(--cx-warn);background:var(--cx-warn-bg)}
.cx-status.is-bad{color:var(--cx-bad);background:var(--cx-bad-bg)}
.cx-status.is-info{color:var(--cx-info);background:var(--cx-info-bg)}
.cx-result-value{margin:10px 0 2px;display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px;overflow-wrap:anywhere}
.cx-num{font-family:var(--cx-mono);font-size:clamp(34px,4.4vw,48px);font-weight:600;line-height:1.1;letter-spacing:-.02em;color:var(--cx-navy);font-variant-numeric:tabular-nums}
.cx-unit{font-size:18px;font-weight:600;color:var(--cx-muted)}
.cx-result-note{margin:0;font-size:14px;color:var(--cx-muted);font-family:var(--cx-mono)}
.cx-rows{display:grid;grid-template-columns:1fr;margin:16px 0 0;border-top:1px solid #edf1f5}
.cx-rows div{display:flex;justify-content:space-between;gap:16px;padding:8px 0;border-bottom:1px solid #edf1f5;font-size:14px}
.cx-rows dt{color:var(--cx-muted)}
.cx-rows dd{margin:0;text-align:right;font-family:var(--cx-mono);font-variant-numeric:tabular-nums;color:var(--cx-ink);overflow-wrap:anywhere}

.cx-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:16px 0 0}
.cx-btn{display:inline-flex;align-items:center;gap:7px;min-height:40px;padding:0 14px;border-radius:9px;border:1px solid #c5d2df;background:#fff;color:var(--cx-ink);font:600 14px Manrope,ui-sans-serif,sans-serif;cursor:pointer;transition:border-color .15s,background .15s,transform .15s}
.cx-btn:hover{border-color:var(--cx-navy)}
.cx-btn:focus-visible,.cx-chip:focus-visible,.cx-adv>summary:focus-visible,.cx-tile:focus-visible{outline:2px solid var(--cx-gold);outline-offset:2px}
.cx-btn-primary{background:var(--cx-navy);border-color:var(--cx-navy);color:#fff}
.cx-btn-primary:hover{background:#1d2f55}
.cx-btn-quiet{border-color:transparent;color:var(--cx-muted)}
.cx-icon{width:16px;height:16px;flex:0 0 auto}
.cx-copied{font-size:13px;font-weight:600;color:var(--cx-ok);opacity:0;transition:opacity .2s}
.cx-copied.is-on{opacity:1}

.cx-formula{margin-top:18px;padding:14px 16px;border-radius:12px;background:var(--cx-soft);border:1px solid #e6ecf2}
.cx-formula-title{margin:0 0 6px;font-family:Manrope,ui-sans-serif,sans-serif!important;font-size:12px!important;font-weight:700;letter-spacing:.08em!important;text-transform:uppercase;color:#6a7d91!important}
.cx-formula ol{margin:0;padding-left:20px;font-family:var(--cx-mono);font-size:13px;line-height:1.65;color:#2a3d55;overflow-wrap:anywhere}
.cx-formula li+li{margin-top:4px}
.cx-formula b{color:var(--cx-navy)}
.cx-sr{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Content */
.cx-article{margin-top:48px;padding:48px 0 16px;background:#fff;border-top:1px solid var(--cx-line);border-bottom:1px solid var(--cx-line)}
.cx-prose{max-width:820px}
.cx-prose section+section{margin-top:36px}
.cx-prose h2,.cx-section h2{margin:0 0 10px;font-size:clamp(22px,2.4vw,27px);line-height:1.25;font-weight:600}
.cx-prose p{margin:0 0 12px}
.cx-list{margin:8px 0 0;padding-left:20px}
.cx-list li{margin:6px 0}
.cx-table-wrap{margin:14px 0 6px;overflow-x:auto;border:1px solid var(--cx-line);border-radius:12px;background:#fff}
.cx-table-wrap:focus-visible{outline:2px solid var(--cx-gold);outline-offset:2px}
.cx-table-tall{max-height:480px;overflow-y:auto}
.cx-table{width:100%;border-collapse:collapse;font-size:14px}
.cx-table caption{padding:10px 12px;text-align:left;font-weight:700;font-size:13px;color:var(--cx-muted);background:#fff;caption-side:top}
.cx-table th,.cx-table td{padding:8px 12px;text-align:left;border-top:1px solid #edf1f5}
.cx-table thead th{position:sticky;top:0;background:var(--cx-soft);font-weight:700;white-space:nowrap}
.cx-table td,.cx-table tbody th{font-family:var(--cx-mono);font-variant-numeric:tabular-nums;font-weight:400}
.cx-table tbody tr:hover{background:#fafcfe}

/* Invitation, FAQ, related */
.cx-band{padding:40px 0 8px}
.cx-invite{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:30px 32px;border-radius:18px;color:#fff;background:linear-gradient(135deg,var(--cx-deep) 0%,#10213d 64%,#17294a 100%);position:relative;overflow:hidden;isolation:isolate}
.cx-invite::after{content:"";position:absolute;z-index:-1;width:360px;height:360px;right:-140px;top:-200px;border-radius:50%;background:radial-gradient(circle,rgba(252,163,17,.25),rgba(252,163,17,0) 68%)}
.cx-invite .cx-kicker{color:#9fb3ca}
.cx-invite h2{margin:0 0 6px;color:#fff!important;font-size:clamp(20px,2.4vw,26px);line-height:1.25}
.cx-invite p{margin:0;color:#ccd7e5;max-width:620px}
.cx-invite-btn{flex:0 0 auto;gap:8px;text-decoration:none;white-space:normal;text-align:left}
.cx-section{padding-top:44px}
.cx-section-head{margin-bottom:16px}
.cx-section-head p{margin:0;color:var(--cx-muted)}
.cx-faq{border-top:1px solid var(--cx-line)}
.cx-faq details{border-bottom:1px solid var(--cx-line)}
.cx-faq summary{cursor:pointer;padding:15px 28px 15px 0;font-weight:700;list-style:none;position:relative}
.cx-faq summary::-webkit-details-marker{display:none}
.cx-faq summary::after{content:"+";position:absolute;right:4px;top:13px;font-family:var(--cx-mono);font-size:18px;color:var(--cx-muted)}
.cx-faq details[open] summary::after{content:"−"}
.cx-faq p{margin:0 0 16px;color:#31445a;max-width:780px}
.cx-tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px}
.cx-tile{display:flex;flex-direction:column;gap:8px;min-width:0;padding:20px;border:1px solid var(--cx-line);border-radius:14px;background:#fff;color:var(--cx-ink)!important;text-decoration:none;transition:border-color .18s,box-shadow .18s,transform .18s}
.cx-tile:hover{border-color:#9fb3c8;box-shadow:0 14px 30px rgba(16,33,58,.09);transform:translateY(-2px)}
.cx-tile-icon{width:22px;height:22px;color:var(--cx-navy);padding:7px;box-sizing:content-box;border-radius:10px;background:#fff4dc}
.cx-tile-name{margin:4px 0 0;font-size:17px!important;line-height:1.3;font-weight:600}
.cx-tile-copy{font-size:14px;line-height:1.5;color:var(--cx-muted)}
.cx-tile-go{margin-top:auto;padding-top:4px;font-size:13px;font-weight:700;color:var(--cx-blue)}
.cx-more{margin:16px 0 0;font-weight:600}
.cx-hub-section+.cx-hub-section{padding-top:36px}

@media (max-width:1023px){
  .cx-tool{grid-template-columns:minmax(0,1fr)}
  .cx-output{position:relative;top:0}
}
@media (max-width:640px){
  /* On phones the site gives <main> its 16px gutter (silproof.css); the wrapper adds none, and the
     full-width white band reaches the screen edges through it. */
  .cx-wrap{padding:0}
  .cx-article{margin-left:-16px;margin-right:-16px;padding-left:16px;padding-right:16px}
  .cx-inputs,.cx-output{padding:18px 16px}
  .cx-hero{padding:10px 0 16px}
  .cx-lede{font-size:16px}
  /* Phones: the site's touch-target rule makes buttons 44px high with 15px text (silproof.css),
     so the examples sit two to a row and wrap their text inside the chip. */
  .cx-presets{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:16px}
  .cx-presets-k{grid-column:1/-1}
  .cx-chip{border-radius:10px;padding:6px 10px;text-align:left;line-height:1.3;white-space:normal}
  .cx-grid{grid-template-columns:1fr}
  .cx-field.cx-half{grid-column:1/-1}
  .cx-invite{flex-direction:column;align-items:flex-start;padding:24px 20px}
  .cx-article{margin-top:32px;padding-top:32px}
  .cx-rows div{flex-direction:column;gap:0}
  .cx-rows dd{text-align:left}
  .cx-seg-opt span{padding:8px 8px;white-space:normal}
}
@media (prefers-reduced-motion:reduce){
  .cx-page *{transition:none!important}
  .cx-tile:hover{transform:none}
}