:root{
  --ink:#16222b;--muted:#5f6c76;--line:#d9dedf;--paper:#faf8f4;--soft:#f2efe9;
  --surface:#ffffff;--steel:#1b2a34;--steel-2:#223643;--accent:#d99a3b;--accent-dark:#9d6b20;--ok:#1c7b4f;
  --shadow:0 10px 24px rgba(14,25,33,.07);--radius:3px;--max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.58}
a{color:inherit}img{max-width:100%;height:auto}
.wrap{width:min(var(--max),calc(100% - 42px));margin:0 auto}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;z-index:99;background:#fff;padding:9px 12px;border:1px solid var(--line)}
.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.98);border-bottom:1px solid var(--line);box-shadow:0 4px 14px rgba(13,26,35,.045);backdrop-filter:blur(10px)}
.navbar{min-height:72px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;white-space:nowrap}
.brand-logo{display:block;height:36px;width:auto}
.brand-text{display:flex;flex-direction:column;line-height:1.02}
.brand-name{font-size:1.18rem;font-weight:850;letter-spacing:-.03em;color:var(--steel)}
.brand-text small{display:block;font-size:10px;font-weight:800;letter-spacing:.14em;color:var(--muted);text-transform:uppercase;margin-top:4px}
.brand-mark{width:34px;height:34px;border:2px solid var(--ink);display:grid;place-items:center;background:var(--accent);font-size:15px;line-height:1}
.navlinks{display:flex;gap:22px;align-items:center;margin-left:auto}
.navlinks a{text-decoration:none;font-weight:700;font-size:14px;color:#29343b;padding:8px 0}
.navlinks a:hover,.navlinks a:focus{color:var(--accent-dark)}
.menu-btn{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;padding:8px 10px;border-radius:2px;font-weight:700}
.hero{position:relative;overflow:hidden;background:linear-gradient(160deg,#16232d 0%,#213541 100%);color:#fff;padding:54px 0 52px;border-bottom:4px solid var(--accent)}
.hero:before{content:"";position:absolute;inset:0;opacity:.08;background-image:linear-gradient(rgba(255,255,255,.22) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.22) 1px,transparent 1px);background-size:36px 36px;transform:translateY(-18%) skewY(-8deg)}
.hero-grid{position:relative;display:grid;grid-template-columns:minmax(0,1.03fr) minmax(380px,.97fr);gap:46px;align-items:center}
.eyebrow{font-size:12px;letter-spacing:.13em;text-transform:uppercase;font-weight:800;color:#f0c27a;margin:0 0 12px}
h1{font-size:clamp(2.2rem,5vw,4.1rem);line-height:1.02;letter-spacing:-.055em;margin:0 0 18px;max-width:850px}
.hero p.lede{font-size:1.05rem;color:#d8e0e4;max-width:720px;margin:0 0 22px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 16px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:10px 15px;border-radius:2px;border:1px solid transparent;text-decoration:none;font-weight:800;font-size:14px;cursor:pointer}
.btn-primary{background:var(--accent);color:#1a1d20;border-color:var(--accent)}.btn-primary:hover{background:#e5ad58}
.btn-ghost{background:transparent;border-color:#6a7a84;color:#fff}.btn-ghost:hover{border-color:#fff}
.trust-row{display:flex;flex-wrap:wrap;gap:10px 18px;font-size:12.5px;color:#cbd6dc;margin-top:22px}.trust-row span:before{content:"✓";color:#f0c27a;font-weight:900;margin-right:6px}
.calc-panel{background:#fff;color:var(--ink);padding:22px;border:1px solid #9daab3;border-radius:var(--radius);box-shadow:0 18px 40px rgba(0,0,0,.16)}
.calc-panel h2{font-size:1.24rem;margin:0 0 5px;letter-spacing:-.02em}.calc-panel .calc-note{font-size:12.5px;color:var(--muted);margin:0 0 18px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.field label{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.055em;font-weight:800;margin:0 0 5px;color:#47545e}
.field input,.field select,.search{width:100%;height:43px;border:1px solid #bcc5ca;border-radius:2px;background:#fff;padding:9px 10px;font:inherit;color:var(--ink)}
.field input:focus,.field select:focus,.search:focus{outline:3px solid rgba(217,154,59,.18);border-color:var(--accent-dark)}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:16px}
.result{background:#f5f5f2;border-left:3px solid var(--accent);padding:10px 11px;min-height:67px}.result small{display:block;font-size:10.5px;letter-spacing:.075em;text-transform:uppercase;color:#68737c;font-weight:800}.result strong{display:block;font-size:1.3rem;letter-spacing:-.025em;margin-top:2px}
.calc-warning{font-size:11.5px;color:#616b73;margin:12px 0 0}
.metric-bar{background:#fff;border-bottom:1px solid var(--line)}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr)}.metric{padding:14px 18px;border-right:1px solid var(--line)}.metric:last-child{border-right:0}.metric b{display:block;font-size:13px}.metric span{display:block;font-size:12px;color:var(--muted)}
section{padding:60px 0}
.section-soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:25px}.section-head .copy{max-width:760px}
.kicker{font-size:11px;font-weight:900;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-dark);margin:0 0 7px}
h2{font-size:clamp(1.72rem,3.2vw,2.45rem);letter-spacing:-.04em;line-height:1.08;margin:0 0 12px}h3{font-size:1.12rem;letter-spacing:-.015em;margin:0 0 8px}.section-head p,.copy-muted{color:var(--muted);margin:0}
.cluster-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.cluster{background:#fff;border:1px solid var(--line);padding:22px;border-radius:var(--radius);box-shadow:0 4px 12px rgba(19,30,38,.03)}.cluster .num{font:800 11px/1 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent-dark);letter-spacing:.08em}.cluster p{font-size:14px;color:var(--muted);min-height:44px}
.link-arrow{font-weight:800;text-decoration:none;font-size:14px;border-bottom:1px solid #bdc5ca;padding-bottom:2px}.link-arrow:hover{border-color:var(--accent-dark);color:var(--accent-dark)}
.catalog-tools{display:flex;gap:10px;align-items:center;margin-bottom:18px}
.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.tool-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);padding:18px;min-height:182px;text-decoration:none;border-radius:2px;transition:.16s ease}.tool-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#adb8bd}.tool-type{font-size:10px;letter-spacing:.09em;text-transform:uppercase;color:var(--accent-dark);font-weight:900}.tool-card h3{margin-top:7px}.tool-card p{color:var(--muted);font-size:13px;margin:0 0 15px}.tool-card b{margin-top:auto;font-size:13px}.tool-card[hidden]{display:none}
.formula-wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:24px;align-items:start}
.formula-box{background:#19262f;color:#fff;border-left:4px solid var(--accent);padding:24px;border-radius:2px}.formula-box code{display:block;color:#f2c684;font-size:clamp(1rem,2.3vw,1.35rem);white-space:normal;margin:8px 0 13px}.formula-box p{font-size:13px;color:#d0d9df;margin:0}
.steps{display:grid;gap:10px}.step{display:grid;grid-template-columns:36px 1fr;gap:12px;border-bottom:1px solid var(--line);padding:0 0 13px}.step:last-child{border-bottom:0}.step b:first-child{display:grid;place-items:center;width:30px;height:30px;background:var(--accent);border-radius:2px}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:2px}table{width:100%;border-collapse:collapse;background:#fff;font-size:14px}th,td{padding:12px 13px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#edf0ee;font-size:11px;text-transform:uppercase;letter-spacing:.06em}tr:last-child td{border-bottom:0}
.callout{border:1px solid var(--line);border-left:4px solid var(--accent);background:#fff;padding:18px;margin:22px 0}.faq{border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line);padding:15px 0}summary{cursor:pointer;font-weight:800}details p{color:var(--muted);max-width:880px}
.page-hero{background:linear-gradient(160deg,#16232d 0%,#223641 100%);color:#fff;padding:44px 0;border-bottom:4px solid var(--accent)}.page-hero .wrap{display:grid;grid-template-columns:1fr .9fr;gap:38px;align-items:center}.page-hero h1{font-size:clamp(2rem,4.2vw,3.35rem)}
.breadcrumbs{font-size:12px;color:#c7d1d7;margin-bottom:12px}.breadcrumbs a{color:#fff}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:36px;align-items:start}.sidebox{position:sticky;top:88px;border:1px solid var(--line);background:#fff;padding:17px}.sidebox h3{font-size:14px}.sidebox a{display:block;padding:8px 0;border-top:1px solid var(--line);font-size:13px;text-decoration:none}.sidebox a:hover{color:var(--accent-dark)}
.prose{max-width:790px}.prose p,.prose li{color:#46525b}.prose h2{font-size:1.75rem;margin-top:34px}.prose h3{margin-top:24px}.prose ul{padding-left:20px}
.source-list{font-size:13px;color:var(--muted)}.source-list a{color:#2d5c79}
.site-footer{background:#111b22;color:#d4dde2;padding:44px 0 20px;border-top:4px solid var(--accent)}.footer-grid{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:30px}.site-footer h3{color:#fff;font-size:13px}.site-footer a{display:block;color:#c5d0d6;text-decoration:none;font-size:13px;padding:4px 0}.site-footer a:hover{color:#fff}.footer-brand p{max-width:390px;color:#aebbc3;font-size:13px}.footer-brand-logo{display:flex;align-items:center;gap:12px;text-decoration:none;margin-bottom:10px}.footer-brand-logo img{height:30px;width:auto;display:block;filter:brightness(1.08)}.footer-brand-logo span{font-size:1.02rem;font-weight:800;color:#fff;letter-spacing:-.02em}
.footer-bottom{border-top:1px solid #34434d;margin-top:28px;padding-top:18px;font-size:12px;color:#99a8b1}
.legal{padding:52px 0}.legal .prose{max-width:860px}.badge{display:inline-flex;align-items:center;background:#eef0ed;border:1px solid var(--line);padding:5px 8px;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;border-radius:2px}
@media(max-width:900px){.hero-grid,.page-hero .wrap,.formula-wrap,.content-grid{grid-template-columns:1fr}.hero-grid{gap:30px}.calc-panel{max-width:650px}.cluster-grid,.tool-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}.sidebox{position:static}}
@media(max-width:700px){.navlinks{display:none;position:absolute;left:0;right:0;top:72px;background:#fff;border-bottom:1px solid var(--line);padding:12px 18px;flex-direction:column;align-items:flex-start;gap:0}.navlinks.open{display:flex}.navlinks a{width:100%;padding:10px 0}.menu-btn{display:block}.hero{padding-top:38px}.hero-grid{grid-template-columns:1fr}.calc-panel{padding:17px}.form-grid,.result-grid,.metric-grid,.cluster-grid,.tool-grid,.footer-grid{grid-template-columns:1fr}.metric{border-right:0;border-bottom:1px solid var(--line)}.metric:last-child{border-bottom:0}.section-head{align-items:start;flex-direction:column}.catalog-tools{align-items:stretch;flex-direction:column}section{padding:48px 0}.wrap{width:min(var(--max),calc(100% - 26px))}.brand-logo{height:32px}}


/* v1.0.2 industrial visual refinement */
:root{--radius:2px;--paper:#fbfaf7;--soft:#f1efea;--accent:#d99a3b;--accent-dark:#93601a;--steel:#17252f;--steel-2:#213540}
body{background:var(--paper)}
.site-header{background:#fff}
.navbar{min-height:74px}
.brand{gap:0;min-width:232px}
.brand-logo{width:224px;height:auto;max-height:48px;object-fit:contain;object-position:left center}
.brand-text{display:none}
.hero,.page-hero{background-color:#17252f;background-image:linear-gradient(90deg,rgba(12,24,32,.98) 0%,rgba(19,34,44,.92) 48%,rgba(19,34,44,.58) 100%),url('/assets/hero-machining.svg');background-repeat:no-repeat;background-position:center,right center;background-size:cover,auto 112%;}
.hero:before{display:none}
.hero{padding:58px 0 56px;border-bottom:3px solid var(--accent)}
.page-hero{padding:48px 0;border-bottom:3px solid var(--accent)}
.hero-grid,.page-hero .wrap{position:relative}
.calc-panel{border-radius:2px;box-shadow:0 16px 34px rgba(0,0,0,.17);border-color:#8e9ba3}
.cluster,.tool-card,.formula-box,.table-scroll,.badge{border-radius:2px}
.tool-card:hover{transform:translateY(-1px)}
.btn{border-radius:2px}
.field input,.field select,.search{border-radius:1px}
.result{background:#f4f3ef}
.metric-grid{grid-template-columns:repeat(4,1fr)}
.metric b{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;text-transform:uppercase;letter-spacing:.035em}
.section-soft{background:#f1efea}
.cluster{box-shadow:none}
.tool-card{box-shadow:none}
.site-footer{border-top:3px solid var(--accent)}
.footer-brand-logo img{height:34px;filter:none;background:#fff;padding:3px 5px}
.calc-validity{margin-top:12px;padding:9px 11px;border:1px solid #d5dadd;background:#fafafa;font-size:11.5px;color:#59656d}
.calc-validity strong{color:#263740}
.hero-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.hero-meta span{border:1px solid rgba(255,255,255,.22);padding:5px 8px;font-size:11px;letter-spacing:.035em;text-transform:uppercase;color:#d5dee3;background:rgba(15,26,33,.32)}
@media(max-width:700px){.brand{min-width:0}.brand-logo{width:188px;max-height:42px}.hero,.page-hero{background-position:center,right -170px center;background-size:cover,auto 88%}}