/* Screw & Bolt Calculator v2: free, browser-only toolkit */
.sb-page{--sb-navy:#071b35;--sb-ink:#0f1f3a;--sb-muted:#5b6b82;--sb-line:#dbe3ee;--sb-blue:#1f5cf0;--sb-blue-dark:#1548c7;--sb-amber:#ffd75e;--sb-paper:#f4f6fa;--sb-white:#fff;color:var(--sb-ink);background:var(--sb-paper)}
.sb-page .mt-public{display:block;max-width:none;padding:0}
.sb-wrap{max-width:1180px;margin:0 auto;padding:0 24px}
/* hero */
.sb-hero{background:linear-gradient(135deg,#071b35 0%,#0c2a58 60%,#123a7a 100%);color:#fff;padding:clamp(36px,6vw,64px) 0 clamp(60px,8vw,90px);position:relative;overflow:hidden}
.sb-hero::after{content:"";position:absolute;right:-140px;top:-140px;width:460px;height:460px;border-radius:50%;border:60px solid rgba(255,255,255,.05);pointer-events:none}
.sb-hero-inner{position:relative;max-width:820px}
.sb-eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.78rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--sb-amber);margin:0 0 14px}
.sb-eyebrow::before{content:"";width:22px;height:2px;background:var(--sb-amber)}
.sb-hero h1{font-size:clamp(1.9rem,4.4vw,3.2rem);line-height:1.06;letter-spacing:-.02em;margin:0 0 14px}
.sb-hero p{font-size:clamp(1rem,1.4vw,1.15rem);line-height:1.6;color:rgba(255,255,255,.85);max-width:60ch;margin:0 0 20px}
.sb-badges{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.sb-badges li{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:6px 13px;font-size:.84rem;font-weight:700}
.sb-badges li::before{content:"✓";color:var(--sb-amber);font-weight:900}
/* chooser cards */
.sb-choose{margin-top:-44px;position:relative;z-index:2}
.sb-choose h2{margin:0 0 12px;font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:#fff}
.sb-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:12px;margin:0;padding:0;list-style:none}
.sb-card{display:grid;grid-template-columns:44px 1fr;gap:12px;align-items:start;background:#fff;border:1px solid var(--sb-line);border-radius:16px;padding:16px;text-decoration:none;color:var(--sb-ink);box-shadow:0 10px 30px rgba(7,27,53,.08);transition:transform .15s,box-shadow .15s,border-color .15s}
.sb-card:hover{transform:translateY(-3px);border-color:var(--sb-blue);box-shadow:0 16px 36px rgba(31,92,240,.16)}
.sb-card.is-active{border-color:var(--sb-navy);box-shadow:inset 0 0 0 2px var(--sb-navy)}
.sb-card svg{width:44px;height:44px;border-radius:12px;background:var(--sb-navy);padding:9px;box-sizing:border-box;color:var(--sb-amber)}
.sb-card strong{display:block;font-size:1rem;line-height:1.25;margin-bottom:3px}
.sb-card span{display:block;color:var(--sb-muted);font-size:.86rem;line-height:1.4}
.sb-quick{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none}
.sb-quick li a{display:inline-block;background:#fff;border:1px solid var(--sb-line);border-radius:999px;padding:7px 13px;font-size:.84rem;color:var(--sb-ink);text-decoration:none}
.sb-quick li a b{color:var(--sb-blue)}
.sb-quick li a:hover{border-color:var(--sb-blue)}
/* tabs */
.sb-tabs{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-top:1px solid var(--sb-line);border-bottom:1px solid var(--sb-line);margin-top:28px;padding:10px 0}
.sb-tabs-inner{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}
.sb-tabs-inner::-webkit-scrollbar{display:none}
.sb-tabs a{flex:0 0 auto;display:inline-flex;align-items:center;gap:8px;padding:9px 15px;border-radius:999px;border:1px solid var(--sb-line);background:#fff;color:var(--sb-ink);font-weight:750;font-size:.9rem;text-decoration:none;white-space:nowrap;transition:background .15s,color .15s,border-color .15s}
.sb-tabs a i{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:6px;background:var(--sb-paper);font-style:normal;font-size:.72rem;font-weight:900;color:var(--sb-navy)}
.sb-tabs a:hover{border-color:var(--sb-blue);color:var(--sb-blue)}
.sb-tabs a.is-active{background:var(--sb-navy);border-color:var(--sb-navy);color:#fff}
.sb-tabs a.is-active i{background:var(--sb-amber)}
/* panels */
.sb-tools{padding:clamp(22px,4vw,40px) 0}
.sb-panel{background:#fff;border:1px solid var(--sb-line);border-radius:20px;box-shadow:0 14px 40px rgba(7,27,53,.06);overflow:hidden}
.sb-panel-head{padding:22px 28px 16px;border-bottom:1px solid var(--sb-line);display:flex;flex-wrap:wrap;gap:12px 24px;align-items:end;justify-content:space-between}
.sb-panel-head h2{margin:0 0 6px;font-size:clamp(1.3rem,2.2vw,1.65rem);letter-spacing:-.01em}
.sb-panel-head p{margin:0;color:var(--sb-muted);max-width:72ch;line-height:1.5}
.sb-panel-body{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}
.sb-form{padding:22px 28px;border-right:1px solid var(--sb-line);display:grid;gap:14px;align-content:start;background:var(--sb-paper)}
.sb-step{display:flex;align-items:center;gap:10px;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--sb-muted);font-weight:800;margin:0}
.sb-step b{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--sb-navy);color:var(--sb-amber);font-size:.78rem}
.sb-form label{display:grid;gap:6px;font-weight:700;font-size:.92rem}
.sb-form label span{font-weight:500;color:var(--sb-muted);font-size:.82rem;line-height:1.4}
.sb-form select,.sb-form input{font:inherit;font-size:1rem;padding:11px 12px;border:1px solid #c9d4e3;border-radius:10px;background:#fff;color:var(--sb-ink);width:100%;box-sizing:border-box}
.sb-form select:focus,.sb-form input:focus{outline:2px solid var(--sb-blue);outline-offset:1px;border-color:var(--sb-blue)}
.sb-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.sb-row-3{display:grid;grid-template-columns:2fr 1fr;gap:12px}
.sb-advanced{border:1px solid var(--sb-line);border-radius:12px;background:#fff}
.sb-advanced summary{cursor:pointer;padding:10px 14px;font-weight:750;font-size:.9rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
.sb-advanced summary::-webkit-details-marker{display:none}
.sb-advanced summary::after{content:"+";font-weight:900;color:var(--sb-blue)}
.sb-advanced[open] summary::after{content:"–"}
.sb-advanced > div{padding:0 14px 14px;display:grid;gap:12px}
.sb-results{padding:22px 28px;display:grid;gap:16px;align-content:start}
.sb-answer{background:var(--sb-navy);color:#fff;border-radius:16px;padding:20px 22px;position:relative}
.sb-answer small{display:block;font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--sb-amber);margin-bottom:8px;font-weight:800}
.sb-answer p{margin:0;font-size:clamp(1.05rem,1.6vw,1.3rem);line-height:1.45;font-weight:700}
.sb-answer p b{color:var(--sb-amber)}
.sb-answer .sb-copy{position:absolute;right:14px;top:12px}
.sb-copy{display:inline-flex;align-items:center;gap:6px;border:1px solid rgba(255,255,255,.3);background:rgba(255,255,255,.08);color:#fff;border-radius:999px;padding:6px 12px;font:inherit;font-size:.78rem;font-weight:700;cursor:pointer}
.sb-copy:hover{background:rgba(255,255,255,.18)}
.sb-copy.is-done{background:var(--sb-amber);color:var(--sb-navy);border-color:var(--sb-amber)}
.sb-big{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.sb-big > div{background:#fff;border:1px solid var(--sb-line);border-radius:14px;padding:14px 16px;min-height:88px}
.sb-big > div.is-accent{background:linear-gradient(135deg,#1f5cf0,#1548c7);color:#fff;border-color:transparent}
.sb-big small{display:block;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--sb-muted);margin-bottom:6px}
.sb-big .is-accent small{color:rgba(255,255,255,.75)}
.sb-big strong{display:block;font-size:clamp(1.3rem,2.2vw,1.7rem);letter-spacing:-.02em;line-height:1.1}
.sb-big em{display:block;font-style:normal;color:var(--sb-muted);font-size:.84rem;margin-top:6px;font-weight:600}
.sb-big .is-accent em{color:var(--sb-amber)}
.sb-facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;margin:0;padding:0}
.sb-facts div{border:1px solid var(--sb-line);border-radius:12px;padding:12px 14px;background:var(--sb-paper)}
.sb-facts dt{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--sb-muted);margin:0 0 4px}
.sb-facts dd{margin:0;font-weight:800;font-size:.98rem}
.sb-list{background:#fff8dd;border:1px solid #f1dc8a;border-radius:12px;padding:14px 16px;margin:0}
.sb-list h3{margin:0 0 8px;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:#7a5b00}
.sb-list ul{margin:0;padding:0 0 0 18px;line-height:1.6;font-weight:600}
.sb-note,.sb-muted{color:var(--sb-muted);line-height:1.55;margin:0;font-size:.92rem}
.sb-why{border:1px solid var(--sb-line);border-radius:12px}
.sb-why summary{cursor:pointer;padding:10px 14px;font-weight:750;font-size:.9rem;list-style:none;display:flex;justify-content:space-between}
.sb-why summary::-webkit-details-marker{display:none}
.sb-why summary::after{content:"+";font-weight:900;color:var(--sb-blue)}
.sb-why[open] summary::after{content:"–"}
.sb-why > div{padding:0 14px 14px;display:grid;gap:10px}
.sb-compare{width:100%;border-collapse:collapse;font-size:.9rem}
.sb-compare th,.sb-compare td{padding:7px 10px;border-bottom:1px solid var(--sb-line);text-align:left}
.sb-compare th{font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--sb-muted)}
.sb-compare tr.is-current td{font-weight:800;background:#f2f6ff}
/* diagram */
.sb-diagram{border:1px solid var(--sb-line);border-radius:14px;background:#fff;padding:12px 14px 6px}
.sb-diagram svg{width:100%;height:auto;display:block}
.sb-diagram figcaption{font-size:.8rem;color:var(--sb-muted);padding:6px 2px 4px}
/* matches */
.sb-match{display:grid;grid-template-columns:1fr auto;gap:2px 16px;padding:12px 14px;border:1px solid var(--sb-line);border-radius:12px;margin-bottom:8px;background:#fff}
.sb-match strong{font-size:1.1rem}
.sb-match span{color:var(--sb-muted);font-size:.88rem;grid-column:1}
.sb-match em{grid-column:2;grid-row:1/span 3;align-self:center;font-style:normal;font-weight:800;font-size:.76rem;letter-spacing:.06em;text-transform:uppercase;padding:6px 10px;border-radius:999px;background:#eef2f8;color:var(--sb-muted)}
.sb-match.is-best{border-color:var(--sb-blue);background:#f2f6ff}
.sb-match.is-best em{background:var(--sb-blue);color:#fff}
.sb-actions{display:flex;flex-wrap:wrap;gap:10px}
.sb-btn{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:10px 18px;border-radius:12px;border:1px solid var(--sb-line);background:#fff;color:var(--sb-ink);font:inherit;font-weight:800;cursor:pointer;text-decoration:none}
.sb-btn:hover{border-color:var(--sb-blue);color:var(--sb-blue)}
.sb-btn.is-primary{background:var(--sb-blue);border-color:var(--sb-blue);color:#fff}
.sb-btn.is-primary:hover{background:var(--sb-blue-dark);color:#fff}
/* tables */
.sb-tables{display:grid;gap:22px;padding:22px 28px}
.sb-tables h3{margin:0 0 10px;font-size:1.05rem}
.sb-table-wrap{overflow-x:auto;border:1px solid var(--sb-line);border-radius:12px}
.sb-table{width:100%;border-collapse:collapse;font-size:.9rem;min-width:520px}
.sb-table th,.sb-table td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--sb-line);white-space:nowrap}
.sb-table th{background:var(--sb-paper);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--sb-muted)}
.sb-table tbody tr:nth-child(even){background:#fafbfd}
.sb-table td:first-child{font-weight:800}
/* source */
.sb-source{margin:8px 0 0;background:#fff;border:1px solid var(--sb-line);border-radius:20px;padding:24px 28px;display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center}
.sb-source-icon{width:56px;height:56px;border-radius:14px;background:var(--sb-navy);color:var(--sb-amber);display:grid;place-items:center;font-size:1.6rem;font-weight:900}
.sb-source h2{margin:0 0 6px;font-size:1.15rem}
.sb-source p{margin:0;color:var(--sb-muted);line-height:1.55}
.sb-source a{color:var(--sb-blue);font-weight:800}
.sb-page .mt-section{max-width:1180px;margin:0 auto;padding:clamp(28px,4vw,48px) 24px 0}
.sb-page .mt-faq{margin-top:8px}
.sb-page .section.shell{max-width:1180px;margin:0 auto}
@media (max-width:900px){.sb-panel-body{grid-template-columns:1fr}.sb-form{border-right:0;border-bottom:1px solid var(--sb-line)}.sb-source{grid-template-columns:1fr}.sb-choose{margin-top:-30px}}
@media (max-width:560px){.sb-wrap{padding:0 16px}.sb-form,.sb-results,.sb-tables,.sb-panel-head{padding-left:16px;padding-right:16px}.sb-row,.sb-row-3{grid-template-columns:1fr}.sb-answer{padding:18px 16px 16px}.sb-answer .sb-copy{position:static;margin-top:12px}.sb-cards{grid-template-columns:1fr 1fr}.sb-card{grid-template-columns:1fr;gap:8px}.sb-card svg{width:36px;height:36px;padding:7px}}
@media print{.mt-nav,.sb-hero,.sb-choose,.sb-tabs,.sb-form,.sb-actions,.sb-source,.mt-section,.mt-footer,#related-tools,.skip-link,.sb-copy{display:none!important}.sb-panel{border:0;box-shadow:none}.sb-panel[hidden]{display:none}.sb-panel-body{grid-template-columns:1fr}.sb-answer,.sb-big > div.is-accent{background:#eee!important;color:#000;-webkit-print-color-adjust:exact}.sb-answer small,.sb-answer p b,.sb-big .is-accent small,.sb-big .is-accent em{color:#333}.sb-tables{padding:0}.sb-table{min-width:0}}

.sb-shop-link{margin:10px 0 0;font-weight:700}