/* Fastener Engineering Calculators — fully self-contained, namespaced .fc-*
   so it never collides with theme or other plugin styles. Brand palette
   matches engineeringhardware.com (steel-blue + zinc-orange). Mobile-first. */

:root{
  --fc-primary:#1f3a5f; --fc-primary-d:#16294a; --fc-accent:#c47a1a;
  --fc-ink:#16202b; --fc-muted:#5d6b7a; --fc-line:#dde3ec; --fc-bg:#f4f6f9;
  --fc-card:#ffffff; --fc-warn:#fff8e6;
}

/* ── App shell ── */
.fc-app{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--fc-ink);line-height:1.5;font-size:14.5px;background:var(--fc-bg);border:1px solid var(--fc-line);border-radius:12px;padding:18px 18px 22px;box-shadow:0 1px 3px rgba(15,28,46,.04)}
.fc-app-head{margin:0 0 14px}
.fc-app-title{margin:0 0 4px;font-size:22px;font-weight:700;color:var(--fc-primary)}
.fc-app-sub{margin:0;color:var(--fc-muted);font-size:14px}

/* ── Tabs ── */
.fc-tabs{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 18px;padding:6px;background:var(--fc-card);border:1px solid var(--fc-line);border-radius:10px}
.fc-tab{appearance:none;background:transparent;border:0;padding:8px 14px;border-radius:7px;color:var(--fc-muted);font-weight:600;font-size:13.5px;cursor:pointer;transition:background .12s,color .12s;font-family:inherit}
.fc-tab:hover{background:var(--fc-bg);color:var(--fc-ink)}
.fc-tab.is-active,.fc-tab[aria-selected="true"]{background:var(--fc-primary);color:#fff}

/* ── Panel ── */
.fc-panel{background:var(--fc-card);border:1px solid var(--fc-line);border-radius:12px;padding:18px 20px;margin-bottom:14px}
.fc-panel-head{margin-bottom:14px}
.fc-panel-title{margin:0 0 4px;font-size:18px;font-weight:700;color:var(--fc-primary)}
.fc-panel-desc{margin:0;color:var(--fc-muted);font-size:14px}
.fc-loading{color:var(--fc-muted);font-style:italic}
.fc-error{color:#b3261e;background:#fdecea;padding:10px 14px;border-radius:6px}

/* ── Form grid ── */
.fc-form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px 16px;margin-bottom:16px}
.fc-field{display:flex;flex-direction:column;gap:5px}
.fc-field-lbl{font-weight:600;font-size:12.5px;color:var(--fc-ink);letter-spacing:.2px}
.fc-field-hint{font-size:11.5px;color:var(--fc-muted);line-height:1.4}
.fc-input{appearance:none;-webkit-appearance:none;width:100%;padding:8px 11px;border:1px solid var(--fc-line);border-radius:7px;font-size:14px;line-height:1.3;background:#fff;color:var(--fc-ink);font-family:inherit;transition:border-color .15s,box-shadow .15s}
.fc-input:hover{border-color:var(--fc-primary)}
.fc-input:focus{outline:none;border-color:var(--fc-primary);box-shadow:0 0 0 3px rgba(31,58,95,.15)}
select.fc-input{padding-right:30px;background:#fff url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'><path fill='%231f3a5f' d='M6 8 0 0h12z'/></svg>") no-repeat right 10px center/10px 7px;cursor:pointer}
.fc-input-wrap{position:relative;display:flex;align-items:center;gap:6px}
.fc-unit{font-size:13px;color:var(--fc-muted);font-weight:600;min-width:38px}

/* ── Output ── */
.fc-out{display:flex;flex-direction:column;gap:6px;padding:14px 16px;background:linear-gradient(180deg,#f8fafd,#fff);border:1px solid var(--fc-primary);border-left:4px solid var(--fc-primary);border-radius:8px}
.fc-kv{display:flex;justify-content:space-between;align-items:baseline;gap:14px;padding:3px 0;border-bottom:1px dashed #e8edf3}
.fc-kv:last-child{border-bottom:0}
.fc-kv-k{color:var(--fc-muted);font-size:13px;font-weight:600}
.fc-kv-v{color:var(--fc-ink);font-size:15px;font-weight:700}
.fc-kv-u{color:var(--fc-muted);font-size:12.5px;font-weight:500;margin-left:2px}
.fc-note{margin:10px 0 0;font-size:12.5px;color:var(--fc-muted);line-height:1.55;font-style:italic;padding:8px 12px;background:var(--fc-warn);border-left:3px solid #d9b65a;border-radius:4px}

/* Tables (washer, bolt-circle) */
.fc-table{width:100%;border-collapse:collapse;margin:10px 0 4px;font-size:13.5px}
.fc-table th{background:var(--fc-bg);text-align:left;padding:8px 10px;font-weight:600;color:var(--fc-ink);border-bottom:1px solid var(--fc-line);font-size:12px;text-transform:uppercase;letter-spacing:.3px}
.fc-table td{padding:7px 10px;border-bottom:1px solid #eef2f7}
.fc-table tr:last-child td{border-bottom:0}

/* Recommendations */
.fc-recs{margin-top:16px;padding:14px 16px;background:var(--fc-bg);border:1px dashed var(--fc-line);border-radius:8px}
.fc-recs-title{margin:0 0 8px;font-size:12.5px;font-weight:700;color:var(--fc-muted);text-transform:uppercase;letter-spacing:.5px}
.fc-recs-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:6px 10px}
.fc-rec-link{display:block;padding:8px 12px;background:#fff;border:1px solid var(--fc-line);border-radius:7px;text-decoration:none;transition:border-color .12s,background .12s}
.fc-rec-link:hover{border-color:var(--fc-primary);background:#f4f8fc;text-decoration:none}
.fc-rec-name{display:block;font-size:13.5px;font-weight:600;color:var(--fc-primary)}
.fc-rec-std{display:block;font-size:11.5px;color:var(--fc-muted);margin-top:1px}

/* ─────────────────────── Floating widget ─────────────────────── */
.fc-floater{position:fixed;left:20px;bottom:20px;z-index:99998;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.fc-floater-toggle{display:inline-flex;align-items:center;gap:8px;padding:11px 16px 11px 14px;background:var(--fc-primary);color:#fff;border:0;border-radius:30px;font-size:14px;font-weight:600;cursor:pointer;box-shadow:0 6px 20px rgba(15,28,46,.22),0 2px 4px rgba(15,28,46,.08);transition:transform .15s,box-shadow .15s,background .15s;font-family:inherit}
.fc-floater-toggle:hover{background:var(--fc-primary-d);transform:translateY(-1px);box-shadow:0 10px 24px rgba(15,28,46,.28),0 3px 6px rgba(15,28,46,.1)}
.fc-floater-ico{width:18px;height:18px;flex-shrink:0}
.fc-floater-label{letter-spacing:.2px}
.fc-floater-badge{background:var(--fc-accent);color:#fff;font-size:11px;font-weight:700;padding:1px 7px;border-radius:10px;line-height:1.45;margin-left:2px}
.fc-floater[data-state="open"] .fc-floater-toggle{opacity:.6}

.fc-floater-panel{position:absolute;left:0;bottom:60px;width:380px;max-width:calc(100vw - 40px);background:var(--fc-card);border:1px solid var(--fc-line);border-radius:12px;box-shadow:0 16px 40px rgba(15,28,46,.22),0 4px 10px rgba(15,28,46,.08);overflow:hidden;animation:fc-pop .18s ease-out}
@keyframes fc-pop{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}
.fc-floater-head{display:flex;align-items:center;gap:10px;padding:12px 14px;background:linear-gradient(180deg,#f8fafd,#fff);border-bottom:1px solid var(--fc-line)}
.fc-floater-title{flex:1;margin:0;font-size:14px;font-weight:700;color:var(--fc-primary)}
.fc-floater-open{font-size:12.5px;color:var(--fc-accent);text-decoration:none;font-weight:600;white-space:nowrap}
.fc-floater-open:hover{text-decoration:underline}
.fc-floater-close{appearance:none;background:transparent;border:0;color:var(--fc-muted);font-size:22px;line-height:1;cursor:pointer;padding:0 4px;font-family:inherit}
.fc-floater-close:hover{color:var(--fc-ink)}
.fc-floater-body{max-height:60vh;overflow-y:auto;padding:12px 14px}
.fc-tabs-compact{padding:4px;margin:0 0 12px;flex-wrap:wrap}
.fc-tabs-compact .fc-tab{padding:6px 10px;font-size:12.5px}
.fc-compact-content .fc-form-grid{grid-template-columns:1fr 1fr;gap:8px 10px;margin-bottom:10px}
.fc-compact-content .fc-input{padding:6px 10px;font-size:13px}
.fc-compact-content .fc-field-lbl{font-size:11.5px}
.fc-compact-content .fc-field-hint{display:none}
.fc-compact-content .fc-out{padding:10px 12px}
.fc-compact-content .fc-kv-v{font-size:13.5px}
.fc-compact-content .fc-note{font-size:11.5px;padding:6px 8px}
.fc-compact-content .fc-table{font-size:12px}
.fc-compact-content .fc-recs{margin-top:10px;padding:10px 12px}
.fc-compact-content .fc-recs-list{grid-template-columns:1fr}

/* Mobile adjustments */
@media (max-width:600px){
  .fc-app{padding:14px 14px 18px;border-radius:10px}
  .fc-tabs{padding:4px}
  .fc-tab{padding:6px 10px;font-size:12.5px}
  .fc-panel{padding:14px 14px}
  .fc-floater{left:12px;bottom:12px}
  .fc-floater-toggle{padding:9px 14px 9px 12px;font-size:13px}
  .fc-floater-label{display:none}
  .fc-floater-badge{margin-left:0}
  .fc-floater-panel{width:calc(100vw - 24px);left:0;bottom:54px}
  .fc-floater-body{max-height:65vh}
  .fc-form-grid{grid-template-columns:1fr;gap:10px}
}

/* Size-guide link surfaced under each recommendation when the
   Fastener SEO Pages plugin is active. */
.fc-rec{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.fc-rec-guide{display:inline-block;font-size:12px;font-weight:600;color:var(--fc-primary,#1e58c9);text-decoration:none;padding:2px 8px;border:1px solid var(--fc-primary,#1e58c9);border-radius:999px;white-space:nowrap}
.fc-rec-guide:hover{background:var(--fc-primary,#1e58c9);color:#fff}