/* ToolsEngg design system — light engineering green */
:root{
  --bg:#f1f8f2; --bg2:#e6f3e9; --panel:#ffffff; --panel2:#f4faf5; --panel3:#e2f2e7;
  --border:#d3e7d9; --border2:#b4d8bf;
  --text:#1d2f24; --muted:#4d6655; --faint:#74897b;
  --green:#08a759; --green-dim:#067a42; --green-deep:#055c32; --mint:#067a42;
  --amber:#b45309; --red:#dc2626; --gold:#d99a1b;
  --mono:'JetBrains Mono',ui-monospace,'Cascadia Mono',Consolas,monospace;
  --sans:'Inter',-apple-system,'Segoe UI',Roboto,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:15px;line-height:1.65;
  background-image:radial-gradient(1200px 600px at 85% -10%,rgba(8,167,89,.09),transparent 60%),
  radial-gradient(900px 500px at -5% 0%,rgba(217,154,27,.05),transparent 55%);}
a{color:var(--green-dim);text-decoration:none}
a:hover{color:var(--green-deep);text-decoration:underline}
::selection{background:rgba(8,167,89,.22)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:#8fc49e}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.88);backdrop-filter:blur(10px) saturate(150%);
  border-bottom:1px solid var(--border);box-shadow:0 1px 12px rgba(6,90,49,.06);}
.header-inner{max-width:1360px;margin:0 auto;display:flex;align-items:center;gap:20px;padding:0 20px;height:60px}
.logo{display:flex;align-items:center;white-space:nowrap}
.logo:hover{text-decoration:none}
.logo img{height:40px;width:auto;display:block}
.main-nav{display:flex;gap:2px;margin-left:auto}
.main-nav a{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
  padding:6px 12px;border-radius:6px;white-space:nowrap}
.main-nav a:hover{background:var(--panel3);color:var(--green-deep);text-decoration:none}
.header-search{display:flex;align-items:center;background:var(--panel2);border:1px solid var(--border);border-radius:8px;padding:4px 10px;gap:8px;min-width:200px}
.header-search:focus-within{border-color:var(--green);box-shadow:0 0 0 3px rgba(8,167,89,.15)}
.header-search input{background:none;border:none;outline:none;color:var(--text);font-family:var(--mono);font-size:12px;width:100%}
.header-search svg{flex:none;stroke:var(--faint)}
.menu-toggle{display:none;background:none;border:1px solid var(--border2);border-radius:6px;color:var(--green-deep);font-family:var(--mono);font-size:11px;padding:6px 10px;letter-spacing:.1em}
@media(max-width:1080px){.main-nav{display:none}.header-search{display:none}.menu-toggle{display:block}}
.mobile-nav{display:none;background:var(--panel);border-bottom:1px solid var(--border);padding:10px 20px}
.mobile-nav.open{display:block}
.mobile-nav a{display:block;padding:9px 4px;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}

/* ---------- layout ---------- */
.page{max-width:1360px;margin:0 auto;padding:24px 20px 60px;display:grid;grid-template-columns:250px minmax(0,1fr) 300px;gap:28px}
@media(max-width:1120px){.page{grid-template-columns:230px minmax(0,1fr)}.rail{display:none}}
@media(max-width:820px){.page{display:flex;flex-direction:column}.content{order:-1}.sidebar{position:static;max-height:none}}
.sidebar{position:sticky;top:80px;align-self:start;max-height:calc(100vh - 100px);overflow-y:auto;padding-right:4px}
.side-block{border:1px solid var(--border);background:var(--panel);border-radius:10px;margin-bottom:16px;overflow:hidden;box-shadow:0 1px 4px rgba(6,90,49,.05)}
.side-block h3{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--green-deep);
  padding:10px 14px;border-bottom:1px solid var(--border);background:var(--bg2)}
.side-block ul{list-style:none;padding:6px}
.side-block li a{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 8px;border-radius:6px;color:var(--muted);font-size:13px}
.side-block li a:hover{background:var(--panel3);color:var(--green-deep);text-decoration:none}
.side-block li a.on{color:var(--green-deep);background:var(--panel3);font-weight:600}
.side-block li a .cnt{font-family:var(--mono);font-size:10px;color:var(--faint)}
.rail{position:sticky;top:80px;align-self:start;max-height:calc(100vh - 100px);overflow-y:auto}
.content{min-width:0}

/* ---------- breadcrumbs / headings ---------- */
.crumbs{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--faint);margin-bottom:14px}
.crumbs a{color:var(--faint)}
.crumbs a:hover{color:var(--green-dim)}
.crumbs span.sep{margin:0 7px;color:var(--border2)}
h1{font-family:var(--mono);font-size:clamp(22px,3.2vw,32px);font-weight:700;letter-spacing:-.01em;line-height:1.2;margin-bottom:8px}
h1 .accent{color:var(--green)}
.kicker{font-family:var(--mono);font-size:10px;letter-spacing:.24em;text-transform:uppercase;color:var(--green-dim);margin-bottom:10px;display:flex;align-items:center;gap:8px}
.kicker::before{content:"";width:22px;height:1px;background:var(--green)}
.lede{color:var(--muted);font-size:15px;max-width:75ch;margin-bottom:22px}
h2{font-family:var(--mono);font-size:17px;font-weight:600;letter-spacing:.02em;margin:30px 0 12px;padding-top:8px;border-top:1px solid var(--border)}
h2:first-of-type{border-top:none;padding-top:0}
h3.sub{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:18px 0 8px}
p.body{color:#33463b;margin-bottom:12px;max-width:80ch}
.prose ul{margin:0 0 14px 20px;color:#33463b}
.prose li{margin-bottom:5px}
.prose ol{margin:0 0 14px 22px;color:#33463b}

/* ---------- family sections (classification) ---------- */
.fam{margin:26px 0 30px;border:1px solid var(--border);border-radius:14px;background:var(--panel);overflow:hidden;box-shadow:0 2px 10px rgba(6,90,49,.05)}
.fam-head{display:flex;align-items:center;gap:14px;padding:16px 20px;border-bottom:1px solid var(--border);
  background:linear-gradient(90deg,var(--bg2),var(--panel) 70%)}
.fam-ic{flex:none;width:40px;height:40px;border-radius:10px;background:var(--green);display:flex;align-items:center;justify-content:center;box-shadow:0 3px 8px rgba(8,167,89,.3)}
.fam-ic svg{width:22px;height:22px;stroke:#fff;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.fam.amber .fam-ic{background:var(--gold);box-shadow:0 3px 8px rgba(217,154,27,.3)}
.fam-head h2{margin:0;padding:0;border:none;font-size:16px}
.fam-head p{font-size:12.5px;color:var(--muted);margin-top:2px}
.fam-body{padding:16px 20px 20px}
.fam-body .cat-grid{margin:0}
@media(max-width:640px){.fam-head{padding:13px 14px}.fam-body{padding:12px 14px 16px}}

/* ---------- converter widget ---------- */
.conv-card{border:1px solid var(--border2);background:linear-gradient(180deg,var(--panel),var(--panel2));border-radius:12px;padding:20px;margin:18px 0 8px;box-shadow:0 8px 28px rgba(6,90,49,.09)}
.conv-top{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--faint)}
.conv-top .led{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 8px rgba(8,167,89,.7)}
.conv-grid{display:grid;grid-template-columns:1fr 1fr auto;gap:14px;align-items:end}
@media(max-width:640px){.conv-grid{grid-template-columns:1fr}}
.field label{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--faint);margin-bottom:6px}
.field input,.field select{width:100%;background:var(--panel);border:1px solid var(--border2);border-radius:8px;color:var(--text);
  font-family:var(--mono);font-size:16px;padding:11px 12px;outline:none;transition:border-color .15s,box-shadow .15s}
.field select{font-size:13px;padding:12px 10px}
.field select.unit-sel{margin-top:6px;font-size:11px;padding:8px 10px;color:var(--muted)}
.field input:focus,.field select:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(8,167,89,.16)}
.swap-btn{background:var(--panel3);border:1px solid var(--border2);border-radius:8px;color:var(--green-deep);cursor:pointer;
  font-family:var(--mono);font-size:16px;padding:11px 14px;transition:background .15s}
.swap-btn:hover{background:#cfeadb}
.conv-result{margin-top:16px;border:1px solid rgba(8,167,89,.4);background:rgba(8,167,89,.07);border-radius:10px;padding:14px 16px;display:none}
.conv-result.show{display:block;animation:fadein .25s ease}
.conv-result .big{font-family:var(--mono);font-size:clamp(18px,2.6vw,26px);font-weight:600;color:var(--green-deep);word-break:break-all}
.conv-result .formula-line{font-family:var(--mono);font-size:12px;color:var(--muted);margin-top:6px}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- tables ---------- */
.tbl-wrap{border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:12px 0 22px;overflow-x:auto;background:var(--panel)}
table.tbl{width:100%;border-collapse:collapse;font-size:13px}
table.tbl th{background:var(--bg2);font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--green-deep);text-align:left;padding:9px 14px;border-bottom:1px solid var(--border);white-space:nowrap}
table.tbl td{padding:8px 14px;border-bottom:1px solid var(--border);font-family:var(--mono);font-size:12.5px;color:#33463b;white-space:nowrap}
table.tbl tr:last-child td{border-bottom:none}
table.tbl tr:hover td{background:rgba(8,167,89,.05)}
table.tbl td:first-child{color:var(--text);font-weight:600}

/* ---------- cards & grids ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin:14px 0 26px}
.cat-card{border:1px solid var(--border);background:var(--panel);border-radius:10px;padding:14px 16px;display:block;transition:border-color .15s,background .15s,transform .15s,box-shadow .15s}
.cat-card:hover{border-color:var(--green);background:var(--panel2);text-decoration:none;transform:translateY(-2px);box-shadow:0 6px 16px rgba(6,90,49,.1)}
.cat-card .t{color:var(--text);font-weight:600;font-size:14px;margin-bottom:3px;display:block}
.cat-card .s{font-family:var(--mono);font-size:10.5px;color:var(--faint);letter-spacing:.04em;display:block}
.cat-card .n{font-family:var(--mono);font-size:10px;color:var(--green-dim);margin-top:8px;display:block;letter-spacing:.12em;font-weight:700}
.link-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:6px 18px;margin:12px 0 22px}
.link-grid a{font-family:var(--mono);font-size:12px;color:var(--muted);padding:4px 0;border-bottom:1px dashed transparent}
.link-grid a:hover{color:var(--green-deep);text-decoration:none;border-bottom-color:var(--green)}
.stat-row{display:flex;flex-wrap:wrap;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:20px 0}
.stat-cell{flex:1;min-width:130px;background:var(--panel);padding:16px 18px}
.stat-cell .num{font-family:var(--mono);font-size:24px;font-weight:700;color:var(--green)}
.stat-cell .lbl{font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--faint);margin-top:3px}

/* ---------- calculator blocks ---------- */
.calc-card{border:1px solid var(--border);background:var(--panel);border-radius:12px;padding:18px 20px;margin:16px 0;scroll-margin-top:80px;box-shadow:0 1px 5px rgba(6,90,49,.05)}
.calc-card h3{font-family:var(--mono);font-size:14px;font-weight:600;color:var(--text);margin-bottom:2px}
.calc-card .tag{font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--green-dim);display:block;margin-bottom:12px}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;align-items:end}
.calc-grid .field input{font-size:14px}
.calc-actions{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.btn{background:var(--green);color:#fff;border:none;border-radius:8px;font-family:var(--mono);font-weight:700;font-size:12px;
  letter-spacing:.1em;text-transform:uppercase;padding:11px 18px;cursor:pointer;transition:background .15s;box-shadow:0 2px 6px rgba(8,167,89,.3)}
.btn:hover{background:var(--green-dim)}
.btn.ghost{background:transparent;border:1px solid var(--border2);color:var(--muted);box-shadow:none}
.btn.ghost:hover{color:var(--green-deep);border-color:var(--green)}
.calc-out{margin-top:14px;border-top:1px dashed var(--border2);padding-top:12px;display:none}
.calc-out.show{display:block;animation:fadein .25s ease}
.out-row{display:flex;justify-content:space-between;gap:14px;padding:5px 0;font-family:var(--mono);font-size:13px;border-bottom:1px solid rgba(211,231,217,.7);flex-wrap:wrap}
.out-row:last-child{border-bottom:none}
.out-row .k{color:var(--muted)}
.out-row .v{color:var(--green-deep);font-weight:600}
.out-row .v.warn{color:var(--amber)}
.formula-box{border-left:3px solid var(--green);background:var(--panel2);border-radius:0 8px 8px 0;padding:12px 16px;margin:12px 0;font-family:var(--mono);font-size:13px;color:#33463b}
.formula-box b{color:var(--green-dim)}
.note{font-size:12.5px;color:var(--faint);font-family:var(--mono);margin-top:10px}

/* ---------- faq ---------- */
.faq-item{border:1px solid var(--border);border-radius:10px;background:var(--panel);margin-bottom:10px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:13px 16px;font-weight:600;font-size:14px;color:var(--text);list-style:none;display:flex;justify-content:space-between;gap:10px;align-items:center}
.faq-item summary::after{content:"+";font-family:var(--mono);color:var(--green);font-size:16px;flex:none}
.faq-item[open] summary::after{content:"–"}
.faq-item summary:hover{color:var(--green-deep)}
.faq-item .a{padding:0 16px 14px;color:var(--muted);font-size:13.5px}

/* ---------- ads ---------- */
.ad-slot{border:1px dashed var(--border2);border-radius:10px;margin:22px 0;min-height:100px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--panel2)}
.ad-slot .ad-hint{font-family:var(--mono);font-size:9px;letter-spacing:.22em;text-transform:uppercase;color:var(--faint)}
.rail .ad-slot{min-height:250px;margin:0 0 16px}

/* ---------- misc ---------- */
.divider{border:none;border-top:1px solid var(--border);margin:34px 0}
.badge{display:inline-block;font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--green-deep);
  border:1px solid rgba(8,167,89,.45);background:rgba(8,167,89,.08);border-radius:20px;padding:3px 10px;margin-bottom:12px}
.hero{border:1px solid var(--border2);border-radius:14px;background:linear-gradient(160deg,#ffffff,var(--panel2) 55%,#e9f6ee);padding:44px 36px;margin-bottom:26px;position:relative;overflow:hidden;box-shadow:0 10px 34px rgba(6,90,49,.09)}
.hero::after{content:"";position:absolute;right:-70px;top:-70px;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,rgba(8,167,89,.14),transparent 65%)}
.hero h1{font-size:clamp(26px,4vw,40px);max-width:20ch}
.hero .mono-line{font-family:var(--mono);font-size:12px;color:var(--faint);margin-top:16px;letter-spacing:.06em}
.hero .mono-line b{color:var(--green-dim);font-weight:600}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--border);background:var(--bg2);margin-top:40px}
.footer-inner{max-width:1360px;margin:0 auto;padding:36px 20px;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:26px}
@media(max-width:900px){.footer-inner{grid-template-columns:1fr 1fr}}
.footer-inner h4{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--green-deep);margin-bottom:12px}
.footer-inner ul{list-style:none}
.footer-inner li a{display:block;padding:4px 0;color:var(--muted);font-size:13px}
.footer-inner li a:hover{color:var(--green-deep);text-decoration:none}
.footer-brand .logo img{height:52px}
.footer-brand p{color:var(--faint);font-size:12.5px;max-width:38ch;margin-top:12px}
.footer-bottom{border-top:1px solid var(--border);padding:16px 20px;text-align:center;font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.06em}
.footer-bottom a{color:var(--muted)}

/* ---------- cookie banner ---------- */
.cookie-bar{position:fixed;left:16px;bottom:16px;z-index:90;max-width:360px;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);
  border:1px solid var(--border2);border-top:3px solid var(--green);border-radius:12px;padding:16px 18px;display:none;box-shadow:0 16px 50px rgba(6,90,49,.18)}
.cookie-bar.show{display:block;animation:fadein .3s ease}
.cookie-bar p{font-size:12.5px;color:var(--muted);margin-bottom:12px}
.cookie-bar .row{display:flex;gap:10px}
.cookie-bar .btn{padding:8px 14px;font-size:11px}

/* toast */
.toast{position:fixed;bottom:18px;right:18px;z-index:95;background:var(--panel);border:1px solid var(--green);border-radius:8px;
  color:var(--text);font-family:var(--mono);font-size:12px;padding:10px 16px;display:none;box-shadow:0 8px 24px rgba(6,90,49,.14)}
.toast.show{display:block;animation:fadein .2s ease}

/* print */
@media print{
  .site-header,.sidebar,.rail,.site-footer,.cookie-bar,.ad-slot,.main-nav,.menu-toggle{display:none!important}
  .page{display:block;padding:0}
  body{background:#fff;color:#000}
  .conv-card,.calc-card,.cat-card,.faq-item,.fam{border-color:#ccc;background:#fff}
}

/* ---------- pill nav & family sub-groups ---------- */
.pill-nav{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 26px}
.pill-nav a{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--green-deep);
  background:var(--panel);border:1px solid var(--border2);border-radius:20px;padding:7px 15px;transition:all .15s}
.pill-nav a:hover{background:var(--green);color:#fff;border-color:var(--green);text-decoration:none;box-shadow:0 3px 8px rgba(8,167,89,.3)}
.fam-sub{display:flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--green-deep);margin:16px 0 4px}
.fam-sub:first-child{margin-top:0}
.fam-ic.sm{width:26px;height:26px;border-radius:7px}
.fam-ic.sm svg{width:15px;height:15px}