/* ============================================================
   CONCRETE TOOLS — design tokens
   Subject: ready-mix concrete / jobsite estimating.
   Signature element: the "batch ticket" result card, styled
   after a real concrete delivery ticket (dashed tear edge,
   stamped mark, monospace figures, ticket number).
   ============================================================ */
:root{
  --bg:#EDEAE3;
  --panel:#FFFFFF;
  --ink:#1E1C19;
  --steel:#5B6169;
  --steel-light:#8A8F94;
  --line:#D6D1C7;
  --accent:#FF5A1F;
  --accent-ink:#1A1917;
  --dark:#171614;
  --dark-line:#38352F;
  --dark-ink:#EDEAE3;
  --ok:#2F7A4F;

  --display:"Barlow Condensed", Impact, sans-serif;
  --body:"Inter", -apple-system, Segoe UI, sans-serif;
  --mono:"IBM Plex Mono", "Courier New", monospace;

  --radius:2px;
  --container:1120px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:48px 48px;
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;}
img,svg{display:block;max-width:100%;}
.wrap{max-width:var(--container);margin:0 auto;padding:0 24px;}

h1,h2,h3{
  font-family:var(--display);
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:0.01em;
  margin:0 0 .4em;
  color:var(--ink);
}
h1{font-size:clamp(2.2rem,5vw,3.6rem);line-height:0.98;}
h2{font-size:clamp(1.5rem,3vw,2.1rem);}
h3{font-size:1.15rem;}
p{margin:0 0 1em;color:var(--ink);}
.lede{color:var(--steel);font-size:1.05rem;max-width:62ch;}

.mono{font-family:var(--mono);}

/* ---------- header ---------- */
.site-header{
  background:var(--dark);
  color:var(--dark-ink);
  border-bottom:3px solid var(--accent);
  position:sticky;top:0;z-index:50;
}
.site-header .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-family:var(--display);
  font-weight:800;
  font-size:1.3rem;
  text-transform:uppercase;
  letter-spacing:.02em;
  text-decoration:none;
  color:var(--dark-ink);
}
.brand .mark{
  width:26px;height:26px;background:var(--accent);
  clip-path:polygon(0 100%,0 40%,50% 0,100% 40%,100% 100%,70% 100%,70% 55%,50% 40%,30% 55%,30% 100%);
}
.nav{display:flex;gap:22px;align-items:center;}
.nav a{
  font-size:.82rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;
  text-decoration:none;color:#C9C5BC;border-bottom:2px solid transparent;padding-bottom:4px;
}
.nav a:hover{color:var(--dark-ink);border-color:var(--accent);}
.nav-toggle{display:none;background:none;border:1px solid var(--dark-line);color:var(--dark-ink);
  width:40px;height:40px;font-size:1.2rem;cursor:pointer;}

/* ---------- search bar ---------- */
.search-wrap{position:relative;}
.search-box{
  display:flex;align-items:center;gap:8px;
  background:#232120;border:1px solid var(--dark-line);
  padding:8px 12px;min-width:220px;
}
.search-box svg{width:16px;height:16px;color:#9A968D;flex-shrink:0;}
.search-box input{
  background:none;border:none;outline:none;color:var(--dark-ink);
  font-family:var(--body);font-size:.86rem;width:100%;
}
.search-box input::placeholder{color:#6E6A61;}
.search-results{
  position:absolute;top:calc(100% + 6px);left:0;right:0;
  background:var(--panel);border:1px solid var(--line);
  max-height:340px;overflow-y:auto;z-index:60;display:none;
}
.search-results.show{display:block;}
.search-results a{
  display:block;padding:10px 14px;text-decoration:none;color:var(--ink);
  border-bottom:1px solid var(--line);font-size:.88rem;
}
.search-results a:last-child{border-bottom:none;}
.search-results a:hover{background:var(--bg);color:var(--accent-ink);}
.search-results a .cat{display:block;font-family:var(--mono);font-size:.68rem;color:var(--steel-light);text-transform:uppercase;margin-top:2px;}
.search-results .no-match{padding:14px;font-size:.85rem;color:var(--steel);}
@media (max-width:760px){.search-wrap{display:none;}}

/* ---------- content / blog pages ---------- */
.prose{max-width:72ch;}
.prose p{color:var(--ink);}
.prose h2{margin-top:1.6em;}
.article-list{display:flex;flex-direction:column;gap:0;}
.article-row{
  display:grid;grid-template-columns:140px 1fr;gap:22px;padding:22px 0;
  border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink);align-items:start;
}
.article-row:hover h3{color:var(--accent-ink);text-decoration:underline;}
.article-row .a-date{font-family:var(--mono);font-size:.72rem;color:var(--steel);text-transform:uppercase;}
.article-row h3{margin:0 0 6px;font-family:var(--body);font-weight:700;font-size:1.05rem;text-transform:none;letter-spacing:0;}
.article-row p{margin:0;color:var(--steel);font-size:.92rem;}
@media (max-width:600px){.article-row{grid-template-columns:1fr;}}

.tool-detail{border-bottom:1px solid var(--line);padding:26px 0;display:grid;grid-template-columns:1fr 160px;gap:20px;align-items:start;}
.tool-detail h3{margin-bottom:6px;font-size:1.1rem;}
.tool-detail p{margin:0;color:var(--steel);font-size:.92rem;max-width:62ch;}
.tool-detail .cat-tag{font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-ink);background:var(--accent);padding:2px 8px;display:inline-block;margin-bottom:8px;}
.tool-detail .go-btn{align-self:center;justify-self:end;font-family:var(--display);font-weight:800;text-transform:uppercase;font-size:.82rem;color:var(--ink);border:1px solid var(--ink);padding:10px 16px;text-decoration:none;white-space:nowrap;}
.tool-detail .go-btn:hover{background:var(--ink);color:var(--bg);}
@media (max-width:600px){.tool-detail{grid-template-columns:1fr;}.tool-detail .go-btn{justify-self:start;}}

.author-card{display:grid;grid-template-columns:180px 1fr;gap:28px;align-items:start;padding:28px 0;}
.author-card img{width:180px;height:180px;object-fit:cover;border:1px solid var(--line);filter:grayscale(15%);}
.author-card h2{margin-bottom:4px;}
.author-card .role{font-family:var(--mono);font-size:.78rem;color:var(--steel);text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px;}
@media (max-width:640px){.author-card{grid-template-columns:1fr;}.author-card img{width:140px;height:140px;}}

.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding:8px 0 48px;}
@media (max-width:760px){.contact-grid{grid-template-columns:1fr;}}
textarea{width:100%;padding:11px 12px;border:1px solid var(--line);background:var(--bg);
  font-family:var(--body);font-size:.95rem;color:var(--ink);border-radius:var(--radius);resize:vertical;min-height:120px;}

/* ---------- hero / band ---------- */
.hero{padding:56px 0 40px;border-bottom:1px solid var(--line);}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--accent-ink);background:var(--accent);padding:4px 10px;margin-bottom:16px;
}
.eyebrow::before{content:"";width:6px;height:6px;background:var(--accent-ink);}

.breadcrumb{font-family:var(--mono);font-size:.78rem;color:var(--steel);margin-bottom:18px;}
.breadcrumb a{text-decoration:none;color:var(--steel);}
.breadcrumb a:hover{color:var(--accent);}

/* ---------- layout: calculator + ticket ---------- */
.calc-grid{
  display:grid;grid-template-columns:1.1fr .9fr;gap:28px;
  padding:8px 0 48px;align-items:start;
}
@media (max-width:860px){.calc-grid{grid-template-columns:1fr;}}

.panel{
  background:var(--panel);
  border:1px solid var(--line);
  padding:28px;
  box-shadow:0 2px 0 var(--line);
}
.panel h2{font-size:1.1rem;margin-bottom:18px;}

.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px;}
.field-row.three{grid-template-columns:1fr 1fr 1fr;}
@media (max-width:520px){.field-row,.field-row.three{grid-template-columns:1fr;}}

label{
  display:block;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;
  color:var(--steel);margin-bottom:6px;
}
input[type=number],input[type=text],select{
  width:100%;padding:11px 12px;border:1px solid var(--line);background:var(--bg);
  font-family:var(--mono);font-size:1rem;color:var(--ink);border-radius:var(--radius);
  transition:border-color .15s, box-shadow .15s;
}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent);}
input:hover,select:hover{border-color:var(--steel-light);}

.shape-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px;}
.shape-tab{
  font-family:var(--mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;
  padding:9px 14px;border:1px solid var(--line);background:var(--bg);cursor:pointer;color:var(--steel);
  transition:background .15s, color .15s, border-color .15s;
}
.shape-tab:hover{border-color:var(--ink);color:var(--ink);}
.shape-tab.active{background:var(--ink);color:var(--bg);border-color:var(--ink);}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  width:100%;padding:15px 18px;margin-top:6px;
  background:var(--accent);color:var(--accent-ink);border:none;
  font-family:var(--display);font-weight:800;font-size:1.05rem;text-transform:uppercase;letter-spacing:.03em;
  cursor:pointer;transition:filter .15s, transform .1s;
}
.btn:hover{filter:brightness(0.95);}
.btn:active{transform:translateY(1px);}
.hint{font-size:.82rem;color:var(--steel-light);margin-top:10px;}

/* ---------- batch ticket (signature element) ---------- */
.ticket{
  background:var(--panel);
  border:1px solid var(--line);
  position:relative;
  font-family:var(--mono);
  padding:0;
  overflow:hidden;
  box-shadow:0 2px 0 var(--line);
}
.ticket-head{
  background:var(--dark);color:var(--dark-ink);padding:16px 22px;
  display:flex;justify-content:space-between;align-items:baseline;
}
.ticket-head .t-name{font-family:var(--display);font-size:1.05rem;text-transform:uppercase;letter-spacing:.04em;}
.ticket-head .t-id{font-size:.7rem;color:#9A968D;}
.ticket-body{padding:22px;}
.ticket-row{
  display:flex;justify-content:space-between;align-items:baseline;
  padding:9px 0;border-bottom:1px dashed var(--line);font-size:.88rem;
}
.ticket-row:last-child{border-bottom:none;}
.ticket-row .k{color:var(--steel);}
.ticket-row .v{font-weight:700;}
.ticket-total{
  margin-top:14px;padding-top:16px;border-top:2px solid var(--ink);
  display:flex;justify-content:space-between;align-items:baseline;
}
.ticket-total .k{font-family:var(--display);text-transform:uppercase;font-size:1rem;}
.ticket-total .v{font-family:var(--mono);font-size:1.9rem;font-weight:700;color:var(--accent-ink);
  background:var(--accent);padding:2px 10px;}
.ticket-perf{
  height:14px;
  background-image:radial-gradient(circle,var(--bg) 4px,transparent 4.5px);
  background-size:20px 14px;background-position:6px 0;
  border-top:1px dashed var(--line);
}
.ticket-stamp{
  position:absolute;top:64px;right:-38px;
  background:transparent;border:3px solid var(--ok);color:var(--ok);
  font-family:var(--display);font-weight:800;text-transform:uppercase;font-size:.85rem;
  padding:4px 44px;transform:rotate(18deg);letter-spacing:.08em;opacity:0;transition:opacity .25s;
}
.ticket-stamp.show{opacity:.85;}
.ticket-note{padding:16px 22px;font-family:var(--body);font-size:.82rem;color:var(--steel);}

/* ---------- related tools ---------- */
.tools-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:8px 0 56px;
}
@media (max-width:760px){.tools-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:480px){.tools-grid{grid-template-columns:1fr;}}
.tool-card{
  border:1px solid var(--line);background:var(--panel);padding:20px;text-decoration:none;
  display:flex;flex-direction:column;gap:10px;transition:border-color .15s, transform .15s, box-shadow .15s;
}
.tool-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 6px 14px rgba(0,0,0,.08);}
.tool-card .icon{width:34px;height:34px;color:var(--accent);}
.tool-card h3{margin:0;font-size:1rem;}
.tool-card p{margin:0;font-size:.85rem;color:var(--steel);}
.tool-card .vol{font-family:var(--mono);font-size:.72rem;color:var(--steel-light);text-transform:uppercase;}

/* ---------- content sections ---------- */
.section{padding:40px 0;border-top:1px solid var(--line);}
.section h2{margin-bottom:20px;}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:36px;}
@media (max-width:760px){.two-col{grid-template-columns:1fr;}}

.faq-item{border-bottom:1px solid var(--line);padding:16px 0;}
.faq-item h3{margin-bottom:6px;font-size:1rem;text-transform:none;font-family:var(--body);font-weight:700;}
.faq-item p{color:var(--steel);margin:0;font-size:.94rem;}

table.spec{width:100%;border-collapse:collapse;font-size:.88rem;}
table.spec th,table.spec td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);}
table.spec th{font-family:var(--mono);text-transform:uppercase;font-size:.72rem;color:var(--steel);}

.callout{background:var(--dark);color:var(--dark-ink);padding:22px 26px;border-left:4px solid var(--accent);}
.callout p{color:#C9C5BC;margin:0;}
.callout strong{color:var(--dark-ink);}

/* ---------- footer ---------- */
.site-footer{background:var(--dark);color:#9A968D;padding:48px 0 28px;margin-top:24px;}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px;margin-bottom:32px;}
.footer-grid.wide{grid-template-columns:1.1fr repeat(6,1fr);}
@media (max-width:1000px){.footer-grid.wide{grid-template-columns:1fr 1fr 1fr 1fr;}}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr;}}
.footer-grid h4{font-family:var(--mono);text-transform:uppercase;font-size:.72rem;letter-spacing:.08em;color:#C9C5BC;margin-bottom:12px;}
.footer-grid a{display:block;font-size:.86rem;color:#9A968D;text-decoration:none;margin-bottom:8px;}
.footer-grid a:hover{color:var(--accent);}
.footer-bottom{border-top:1px solid var(--dark-line);padding-top:20px;font-size:.78rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;}

@media (max-width:760px){
  .nav{position:absolute;top:64px;left:0;right:0;background:var(--dark);flex-direction:column;padding:16px 24px;display:none;border-bottom:3px solid var(--accent);}
  .nav.open{display:flex;}
  .nav-toggle{display:block;}
}