/* ==========================================================================
   JOBSITE CALCULATORS — design system
   Palette: steel charcoal + raw-concrete paper + hi-vis safety amber
   Type: Oswald (display / stencil), Inter (body), IBM Plex Mono (data)
   ========================================================================== */

:root {
  /* color */
  --charcoal:      #1c2023;
  --charcoal-700:  #2a3034;
  --steel-600:     #4a5a63;
  --steel-300:     #8f9ba1;
  --concrete-100:  #f6f5f1;
  --concrete-200:  #ece9e1;
  --concrete-300:  #d8d6ce;
  --paper:         #fffdf9;
  --safety-500:    #ffb81c;
  --safety-600:    #e8a100;
  --caution-600:   #d9432a;
  --ok-600:        #2f7a4f;
  --ink:           #1c2023;

  /* type */
  --font-display: "Oswald", "Arial Narrow", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* layout */
  --max-w: 1120px;
  --radius: 3px;
  --border: 1px solid var(--concrete-300);
  --shadow-card: 0 1px 2px rgba(28,32,35,.06), 0 8px 24px rgba(28,32,35,.05);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--concrete-100);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--steel-600); }
a:hover { color: var(--charcoal); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .02em;
  line-height: 1.15;
  color: var(--charcoal);
  margin: 0 0 .5em;
}
h1 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); }
h2 { font-size: clamp(1.3rem, 2vw, 1.6rem); }
h3 { font-size: 1.05rem; letter-spacing: .04em; }

p { margin: 0 0 1em; color: var(--charcoal-700); }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

:focus-visible {
  outline: 3px solid var(--safety-500);
  outline-offset: 2px;
}

/* ---------------------------------- header --------------------------- */
.site-header {
  background: var(--charcoal);
  border-bottom: 4px solid var(--safety-500);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}
.brand {
  display: flex;
  align-items: center;
  gap: .85rem;
  text-decoration: none;
}
.brand .mark {
  flex-shrink: 0;
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  color: var(--charcoal);
  background: var(--safety-500);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.4rem;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,.35);
}
.brand .wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.brand .word-main {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: .01em;
  text-transform: uppercase;
  color: var(--paper);
}
.brand .word-sub {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .8rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--safety-500);
  margin-top: .2rem;
}
.main-nav { display: flex; align-items: center; gap: 1.6rem; }

.nav-dropdown { position: relative; }
.nav-dropdown summary {
  list-style: none; cursor: pointer; user-select: none;
  color: var(--concrete-200);
  font-family: var(--font-display); text-transform: uppercase;
  letter-spacing: .06em; font-size: .82rem;
  display: flex; align-items: center; gap: .35rem;
  padding: .3rem 0;
}
.nav-dropdown summary::-webkit-details-marker { display: none; }
.nav-dropdown summary::after {
  content: "▾"; font-size: .62rem; color: var(--steel-300);
  transition: transform .15s ease;
}
.nav-dropdown[open] summary::after { transform: rotate(180deg); }
.nav-dropdown summary:hover, .nav-dropdown[open] summary { color: var(--safety-500); }

.dropdown-panel {
  position: absolute; top: calc(100% + 16px); left: 50%; transform: translateX(-50%);
  background: var(--paper);
  border: 1px solid var(--concrete-300); border-top: 3px solid var(--safety-500);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  display: flex; gap: 2.2rem; padding: 1.5rem 1.75rem;
  min-width: 560px; z-index: 60;
}
.dropdown-col { display: flex; flex-direction: column; min-width: 130px; }
.dropdown-label {
  font-family: var(--font-mono); font-size: .66rem; text-transform: uppercase;
  letter-spacing: .08em; color: var(--steel-600);
  margin: 0 0 .6rem; padding-bottom: .5rem; border-bottom: 1px solid var(--concrete-300);
}
.dropdown-panel a {
  color: var(--charcoal-700); text-decoration: none;
  font-size: .9rem; padding: .32rem 0;
}
.dropdown-panel a:hover, .dropdown-panel a[aria-current="page"] {
  color: var(--safety-600); font-weight: 600;
}
.main-nav a {
  color: var(--concrete-200);
  text-decoration: none;
  font-size: .82rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--safety-500); }
.main-nav a.donate-link {
  background: var(--safety-500); color: var(--charcoal) !important;
  padding: .4rem .8rem; border-radius: 3px;
}
.main-nav a.donate-link:hover { background: var(--paper); color: var(--charcoal) !important; }
.nav-toggle { display: none; }

@media (max-width: 720px) {
  .main-nav { display: none; }
  .nav-toggle {
    display: inline-flex;
    background: none; border: 1px solid var(--steel-300);
    color: var(--paper); border-radius: var(--radius);
    padding: .4rem .6rem; font-size: 1rem;
  }
  .main-nav.is-open {
    display: flex; flex-direction: column; align-items: flex-start;
    position: absolute; top: 84px; left: 0; right: 0;
    background: var(--charcoal); padding: 1rem 20px; gap: .9rem;
    border-bottom: 4px solid var(--safety-500);
    max-height: calc(100vh - 84px); overflow-y: auto;
  }
  .main-nav.is-open .nav-dropdown { width: 100%; }
  .dropdown-panel {
    position: static; transform: none; min-width: 0;
    background: transparent; border: none; box-shadow: none;
    flex-direction: column; gap: 1rem; padding: .9rem 0 .2rem 1rem;
  }
  .dropdown-label { color: var(--steel-300); border-bottom-color: var(--charcoal-700); }
  .dropdown-panel a { color: var(--concrete-200); }
  .dropdown-panel a:hover, .dropdown-panel a[aria-current="page"] { color: var(--safety-500); }
}

/* ------------------------------- ad slots ------------------------------ */
.ad-slot {
  background: var(--concrete-200);
  border: 1px dashed var(--steel-300);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--steel-600);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  min-height: 90px;
  margin: 1.75rem 0;
}
.ad-slot.leaderboard { min-height: 90px; }
.ad-slot.in-content { min-height: 250px; max-width: 336px; margin-left: auto; margin-right: auto; }

/* --------------------------------- hero --------------------------------- */
.page-hero { padding: 2.25rem 0 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--font-mono); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--steel-600); margin-bottom: .6rem;
}
.eyebrow::before {
  content: ""; width: 18px; height: 2px; background: var(--safety-500);
}
.dim-rule {
  border: none; height: 1px; background: var(--concrete-300);
  position: relative; margin: 1.5rem 0 2rem;
}
.dim-rule::before, .dim-rule::after {
  content: ""; position: absolute; top: -3px; width: 1px; height: 7px;
  background: var(--concrete-300);
}
.dim-rule::before { left: 0; }
.dim-rule::after { right: 0; }

/* -------------------------------- calc layout --------------------------- */
.calc-layout {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 860px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.calc-card {
  background: var(--paper);
  border: var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
}

.field-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.field-row.two { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 520px) { .field-row, .field-row.two { grid-template-columns: 1fr; } }

.field { margin-bottom: 1.1rem; }
.field label {
  display: block; font-size: .78rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .04em;
  color: var(--steel-600); margin-bottom: .35rem;
}
.field .hint { font-size: .74rem; color: var(--steel-300); margin-top: .3rem; }

input[type="number"], input[type="text"], select {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: .65rem .7rem;
  border: 1px solid var(--concrete-300);
  border-radius: var(--radius);
  background: var(--concrete-100);
  color: var(--ink);
}
input[type="number"]:focus, input[type="text"]:focus, select:focus {
  background: var(--paper);
  border-color: var(--steel-600);
}

.unit-group { display: flex; }
.unit-group input { border-radius: var(--radius) 0 0 var(--radius); }
.unit-group .unit {
  display: flex; align-items: center; padding: 0 .7rem;
  background: var(--concrete-200); border: 1px solid var(--concrete-300);
  border-left: none; border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-mono); font-size: .82rem; color: var(--steel-600);
}

.shape-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.25rem; }
.shape-tabs button {
  font-family: var(--font-display);
  font-size: .78rem; letter-spacing: .03em; text-transform: uppercase;
  padding: .5rem .9rem; border: 1px solid var(--concrete-300);
  background: var(--concrete-100); color: var(--charcoal-700);
  border-radius: var(--radius); cursor: pointer;
}
.shape-tabs button[aria-pressed="true"] {
  background: var(--charcoal); color: var(--safety-500); border-color: var(--charcoal);
}

.btn-primary {
  font-family: var(--font-display);
  text-transform: uppercase; letter-spacing: .04em; font-size: .95rem;
  background: var(--safety-500); color: var(--charcoal);
  border: none; border-radius: var(--radius);
  padding: .85rem 1.2rem; width: 100%; cursor: pointer;
  transition: background .15s ease;
}
.btn-primary:hover { background: var(--safety-600); }

.btn-ghost {
  font-family: var(--font-mono); font-size: .78rem;
  background: none; border: 1px solid var(--concrete-300); color: var(--steel-600);
  border-radius: var(--radius); padding: .5rem .8rem; cursor: pointer; margin-top: .6rem; width: 100%;
}
.btn-ghost:hover { border-color: var(--steel-600); color: var(--charcoal); }

/* ------------------------------- results / stamp ------------------------ */
.results-panel {
  position: sticky; top: 20px;
  background: var(--charcoal);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
}
.results-panel .eyebrow { color: var(--steel-300); }
.results-panel .eyebrow::before { background: var(--safety-500); }

.stamp {
  border: 2px solid var(--safety-500);
  border-radius: var(--radius);
  padding: 1.1rem 1.1rem 1.3rem;
  position: relative;
  margin-bottom: 1rem;
}
.stamp .tag {
  position: absolute; top: -11px; right: 12px;
  background: var(--safety-500); color: var(--charcoal);
  font-family: var(--font-mono); font-weight: 700; font-size: .62rem;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 2px 7px; border-radius: 2px; transform: rotate(-2deg);
}
.stamp .value {
  font-family: var(--font-mono); font-weight: 700;
  font-size: 2.1rem; line-height: 1.1; color: var(--paper);
}
.stamp .unit { font-size: 1.1rem; color: var(--steel-300); margin-left: .3rem; }
.stamp .label {
  font-size: .74rem; text-transform: uppercase; letter-spacing: .05em;
  color: var(--steel-300); margin-top: .3rem;
}

.result-line {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: .55rem 0; border-bottom: 1px solid var(--charcoal-700);
  font-family: var(--font-mono); font-size: .88rem;
}
.result-line:last-child { border-bottom: none; }
.result-line .k { color: var(--steel-300); }
.result-line .v { color: var(--paper); font-weight: 600; }

.results-empty {
  color: var(--steel-300); font-size: .88rem; font-family: var(--font-mono);
}

/* ------------------------------- support content ------------------------- */
.support {
  margin-top: 2.75rem;
  padding-top: 2rem;
  border-top: var(--border);
}
.support h2 { margin-bottom: .8rem; }
.formula-box {
  background: var(--paper); border: var(--border); border-radius: var(--radius);
  padding: 1.1rem 1.3rem; font-family: var(--font-mono); font-size: .88rem;
  color: var(--charcoal-700); margin: 1rem 0 1.5rem; overflow-x: auto;
}
.faq { margin-top: 1.5rem; }
.faq details {
  border-bottom: var(--border); padding: .9rem 0;
}
.faq summary {
  font-family: var(--font-display); text-transform: uppercase; letter-spacing: .02em;
  font-size: .92rem; cursor: pointer; color: var(--charcoal);
}
.faq p { margin-top: .6rem; }

/* --------------------------------- hub grid ------------------------------ */
.calc-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem;
  margin: 2rem 0;
}
@media (max-width: 860px) { .calc-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .calc-grid { grid-template-columns: 1fr; } }

.calc-tile {
  background: var(--paper); border: var(--border); border-radius: var(--radius);
  padding: 1.4rem; text-decoration: none; display: block;
  box-shadow: var(--shadow-card);
  transition: transform .12s ease, border-color .12s ease;
}
.calc-tile:hover { transform: translateY(-2px); border-color: var(--safety-500); }
.calc-tile .num {
  font-family: var(--font-mono); font-size: .72rem; color: var(--steel-300);
}
.calc-tile h3 { margin: .4rem 0 .4rem; color: var(--charcoal); }
.calc-tile p { font-size: .88rem; margin: 0; color: var(--steel-600); }

.hero-band {
  background: var(--charcoal); color: var(--paper); padding: 3rem 0 3.5rem;
  border-bottom: 4px solid var(--safety-500);
}
.hero-band h1 { color: var(--paper); }
.hero-band p { color: var(--steel-300); max-width: 60ch; font-size: 1.05rem; }

/* --------------------------------- footer -------------------------------- */
.site-footer {
  background: var(--charcoal); color: var(--steel-300);
  margin-top: 3rem; padding: 2.25rem 0;
  font-size: .82rem;
  border-top: 4px solid var(--safety-500);
}
.site-footer a { color: var(--concrete-200); text-decoration: none; }
.site-footer a:hover { color: var(--safety-500); }

.footer-nav {
  display: flex; flex-wrap: wrap; gap: 1.4rem;
  font-family: var(--font-display); text-transform: uppercase;
  letter-spacing: .05em; font-size: .78rem;
  padding-bottom: 1.4rem; margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--charcoal-700);
}
.footer-nav a[aria-current="page"] { color: var(--safety-500); }

.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem;
}

.disclaimer { font-size: .76rem; color: var(--steel-300); margin-top: .5rem; }

/* ------------------------------ cross-site promo -------------------------- */
.cross-promo {
  background: var(--concrete-200); border: 1px dashed var(--concrete-300);
  border-radius: var(--radius); padding: 1rem 1.5rem; margin: 2.25rem 0;
  text-align: center; font-size: .92rem; color: var(--charcoal-700);
}
.cross-promo a { font-weight: 700; color: var(--safety-600); text-decoration: none; }
.cross-promo a:hover { text-decoration: underline; }
.footer-crosslink {
  font-family: var(--font-mono); font-size: .78rem; color: var(--steel-300);
  margin: 0 0 1.1rem;
}
.footer-crosslink a { color: var(--concrete-200); font-weight: 600; }
.footer-crosslink a:hover { color: var(--safety-500); }

/* ------------------------------ static content pages ---------------------- */
.legal-content { max-width: 76ch; }
.legal-content h2 { margin-top: 2rem; }
.legal-content ul { color: var(--charcoal-700); padding-left: 1.2rem; }
.legal-content li { margin-bottom: .4rem; }
.updated-note {
  font-family: var(--font-mono); font-size: .78rem; color: var(--steel-600);
  margin-bottom: 1.5rem;
}
.contact-card {
  background: var(--paper); border: var(--border); border-radius: var(--radius);
  padding: 1.75rem; box-shadow: var(--shadow-card); max-width: 46ch;
}
.contact-card .value {
  font-family: var(--font-mono); font-size: 1.1rem; word-break: break-word;
}
.legal-note {
  background: var(--concrete-200); border: 1px solid var(--concrete-300);
  border-radius: var(--radius); padding: 1rem 1.2rem;
  font-size: .86rem; color: var(--charcoal-700); margin-bottom: 1.75rem;
}

/* ------------------------------ donate ---------------------------------- */
.donate-banner {
  background: var(--charcoal); color: var(--paper);
  border-radius: var(--radius); border: 1px solid var(--charcoal-700);
  border-left: 4px solid var(--safety-500);
  padding: 1.75rem 2rem; margin: 2.25rem 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; flex-wrap: wrap;
}
.donate-banner .copy { max-width: 56ch; }
.donate-banner h3 { color: var(--paper); margin-bottom: .4rem; }
.donate-banner p { color: var(--steel-300); margin: 0; font-size: .92rem; }
.donate-banner .btn-primary { width: auto; padding: .8rem 1.6rem; flex-shrink: 0; }

.donate-tiers {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; margin: 1.75rem 0;
}
@media (max-width: 720px) { .donate-tiers { grid-template-columns: 1fr; } }
.donate-tier {
  background: var(--paper); border: var(--border); border-radius: var(--radius);
  padding: 1.4rem; box-shadow: var(--shadow-card);
}
.donate-tier .amount {
  font-family: var(--font-mono); font-weight: 700; font-size: 1.3rem; color: var(--charcoal);
}
.donate-tier p { font-size: .88rem; margin: .5rem 0 0; }

.donate-cta {
  text-align: center; padding: 2rem; background: var(--paper);
  border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow-card);
  margin: 1.75rem 0;
}
.donate-cta .btn-primary { width: auto; padding: .95rem 2.2rem; display: inline-block; text-decoration: none; }
.donate-cta p.hint { margin-top: .9rem; }