/* ==========================================================================
   Material Calc — design tokens
   Concept: job-site spec sheet / blueprint grid. Safety-orange and caution-
   yellow are literal job-site colors (signage, tape), not decoration.
   Monospace is used for every number a user reads — it's a spec sheet, so
   figures should look measured, not typeset.
   ========================================================================== */

:root {
  --ink: #20262a;
  --ink-soft: #4a5257;
  --concrete: #edeae1;
  --concrete-dark: #ded8cb;
  --panel: #ffffff;
  --blueprint: #1f3a5f;
  --blueprint-dark: #16293f;
  --safety: #e8630a;
  --safety-dark: #c9540a;
  --caution: #f2b705;
  --steel: #8b9199;
  --steel-light: #c9cdd1;
  --line: #d4cfc2;

  --display: "Space Grotesk", "Arial Narrow", sans-serif;
  --body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --radius: 3px;
  --max-w: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--concrete);
  color: var(--ink);
  font-family: var(--body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; }

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Tape-measure divider — the signature element ---------- */
.tape-rule {
  height: 14px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--steel) 0 2px,
    transparent 2px 24px
  );
  background-position: bottom;
  background-repeat: repeat-x;
  background-size: auto 14px;
  border-bottom: 2px solid var(--ink);
  margin: 0;
}
.tape-rule.tall {
  height: 20px;
  background-size: auto 20px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--ink);
  color: var(--concrete);
  padding: 18px 0;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  color: var(--concrete);
}
.brand-mark {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  background: var(--safety);
  color: var(--ink);
  padding: 3px 7px;
  font-weight: 700;
  border-radius: 2px;
}
.brand-name {
  font-family: var(--display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.crumbs {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--steel-light);
}
.crumbs a { color: var(--caution); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

/* ---------- Hero ---------- */
.hero {
  padding: 64px 0 48px;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--safety-dark);
  font-weight: 600;
  margin: 0 0 14px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin: 0 0 18px;
  max-width: 16ch;
}
.hero p.lede {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 0;
}

/* ---------- Calculator grid (hub) ---------- */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2px;
  background: var(--ink);
  border: 2px solid var(--ink);
  margin: 40px 0;
}
.calc-card {
  background: var(--panel);
  padding: 26px 22px 22px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 168px;
  position: relative;
  transition: background 0.15s ease;
}
.calc-card:hover { background: var(--concrete); }
.calc-card .tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
.calc-card h3 {
  font-family: var(--display);
  font-size: 21px;
  margin: 0;
  letter-spacing: -0.01em;
}
.calc-card p {
  font-size: 14.5px;
  color: var(--ink-soft);
  margin: 0;
  flex-grow: 1;
}
.calc-card .go {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--safety-dark);
  font-weight: 600;
}
.calc-card.disabled {
  color: var(--steel);
  cursor: default;
}
.calc-card.disabled:hover { background: var(--panel); }
.calc-card.disabled h3 { color: var(--steel); }
.calc-card.disabled .go { color: var(--steel); }
.badge-soon {
  position: absolute;
  top: 22px;
  right: 22px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  background: var(--concrete-dark);
  color: var(--ink-soft);
  padding: 3px 7px;
  border-radius: 2px;
}

/* ---------- Calculator page layout ---------- */
.calc-page-hero {
  padding: 40px 0 32px;
}
.calc-page-hero h1 {
  font-family: var(--display);
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.01em;
  margin: 10px 0 12px;
}
.calc-page-hero .lede {
  color: var(--ink-soft);
  font-size: 16.5px;
  max-width: 62ch;
  margin: 0;
}

.calc-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--panel);
  border: 2px solid var(--ink);
  margin: 32px 0;
}
@media (max-width: 760px) {
  .calc-panel { grid-template-columns: 1fr; }
}

.inputs-col {
  padding: 30px 30px 34px;
  border-right: 2px solid var(--ink);
}
@media (max-width: 760px) {
  .inputs-col { border-right: none; border-bottom: 2px solid var(--ink); }
}
.col-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 20px;
}

.field {
  margin-bottom: 20px;
}
.field label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 6px;
}
.field .hint {
  font-size: 12.5px;
  color: var(--steel);
  margin-top: 5px;
}
.input-row {
  display: flex;
  gap: 8px;
}
input[type="number"], select {
  width: 100%;
  font-family: var(--mono);
  font-size: 16px;
  padding: 11px 12px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--concrete);
  color: var(--ink);
}
input[type="number"]:focus, select:focus {
  outline: 3px solid var(--caution);
  outline-offset: 1px;
  border-color: var(--ink);
}
.unit-toggle {
  display: flex;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--mono);
  font-size: 13px;
}
.unit-toggle button {
  flex: 1;
  padding: 9px 10px;
  border: none;
  background: var(--concrete);
  color: var(--ink-soft);
  cursor: pointer;
}
.unit-toggle button.active {
  background: var(--blueprint);
  color: #fff;
  font-weight: 600;
}

.results-col {
  padding: 30px 30px 34px;
  background: var(--ink);
  color: var(--concrete);
}
.results-col .col-label { color: var(--steel-light); }
.result-primary {
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--steel);
}
.result-primary .figure {
  font-family: var(--mono);
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 700;
  color: var(--caution);
  line-height: 1;
  margin-bottom: 6px;
}
.result-primary .figure-label {
  font-size: 14px;
  color: var(--steel-light);
}
.result-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px solid #38424a;
  font-size: 14.5px;
}
.result-line .val {
  font-family: var(--mono);
  font-weight: 600;
  color: #fff;
}
.disclaimer {
  margin-top: 22px;
  font-size: 12.5px;
  color: var(--steel-light);
  line-height: 1.5;
}

/* ---------- Content block (SEO / usefulness) ---------- */
.content-block {
  background: var(--panel);
  border: 2px solid var(--ink);
  border-top: none;
  padding: 34px 34px 8px;
  margin-top: -32px;
  margin-bottom: 40px;
}
.content-block h2 {
  font-family: var(--display);
  font-size: 22px;
  margin: 0 0 14px;
}
.content-block p { color: var(--ink-soft); font-size: 15px; }
.formula-box {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--concrete);
  border: 1.5px dashed var(--steel);
  padding: 16px 18px;
  border-radius: var(--radius);
  margin: 18px 0 26px;
  overflow-x: auto;
}
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 10px 0 26px;
}
.ref-table th, .ref-table td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
}
.ref-table th {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel);
}
.ref-table td.num { font-family: var(--mono); }

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 15px;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "+";
  font-family: var(--mono);
  color: var(--safety);
  margin-right: 10px;
  font-weight: 700;
}
.faq-item[open] summary::before { content: "−"; }
.faq-item p {
  margin: 10px 0 0 22px;
  color: var(--ink-soft);
  font-size: 14.5px;
}

/* ---------- Ad slots ---------- */
.ad-slot {
  background: var(--concrete-dark);
  border: 1px dashed var(--steel);
  color: var(--steel);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 28px auto;
}
.ad-slot.leaderboard { max-width: 728px; height: 90px; }
.ad-slot.rectangle { max-width: 300px; height: 250px; }
.ad-slot.mobile-banner { max-width: 320px; height: 50px; }

/* ---------- Affiliate product recommendations ---------- */
.product-recs {
  margin: 32px 0;
}
.product-recs .col-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 16px;
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}
.product-card {
  background: var(--panel);
  border: 2px solid var(--ink);
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.15s ease, transform 0.15s ease;
}
.product-card:hover { background: var(--concrete); transform: translateY(-1px); }
.product-card.pending { opacity: 0.6; cursor: default; border-style: dashed; }
.product-card.pending:hover { background: var(--panel); transform: none; }
.product-card.pending .p-name em { font-style: normal; font-weight: 400; font-size: 12px; color: var(--ink-soft); }
.product-card .p-name {
  font-family: var(--display);
  font-size: 16px;
  font-weight: 700;
}
.product-card .p-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  flex-grow: 1;
}
.affiliate-disclosure {
  font-size: 12px;
  color: var(--steel);
  margin-top: 10px;
  font-style: italic;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: var(--steel-light);
  padding: 34px 0;
  margin-top: 40px;
  font-size: 13.5px;
}
.site-footer a { color: var(--caution); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 3px solid var(--caution);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}