/* ==========================================================================
   QuantiYard shared stylesheet
   Design system + site chrome + calculator components.
   Every calculator page links this one file.
   ========================================================================== */

/* ---- Design tokens ------------------------------------------------------ */
:root {
  --paper:      #FAF9F6;   /* warm off-white background          */
  --navy:       #132A43;   /* blueprint ink: text, header, result card */
  --navy-soft:  #1D3A59;   /* raised navy surfaces               */
  --amber:      #F2A03D;   /* construction accent: action + key result */
  --amber-deep: #D9822B;   /* amber pressed / hover              */
  --slate:      #5C6B7A;   /* secondary text                     */
  --green:      #1E9E6A;   /* validity / confirmation (sparing)  */
  --line:       #E4E0D6;   /* warm hairline on paper             */
  --paper-dim:  #EDEBE3;   /* quiet fill                         */
  --ink-on-navy:#EAF1F8;   /* readable text on navy              */
  --mut-on-navy:#8FA6BE;   /* muted text on navy                 */

  --radius:     10px;
  --radius-sm:  7px;
  --shadow:     0 1px 2px rgba(19,42,67,.06), 0 8px 24px rgba(19,42,67,.06);
  --maxw:       1080px;

  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --grotesk: "Space Grotesk", "Inter", system-ui, sans-serif;
}

/* ---- Reset / base ------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--navy);
  background-color: var(--paper);
  /* faint blueprint graph-paper grid */
  background-image:
    linear-gradient(rgba(19,42,67,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19,42,67,.035) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--grotesk); font-weight: 600; line-height: 1.15; color: var(--navy); }
a { color: var(--navy); text-decoration-color: var(--amber); text-underline-offset: 3px; }
a:hover { color: var(--amber-deep); }
img { max-width: 100%; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* tabular figures wherever numbers matter */
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

/* ---- Header / nav ------------------------------------------------------- */
.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 40;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand__mark {
  width: 30px; height: 30px; flex: 0 0 auto;
}
.brand__name { font-family: var(--grotesk); font-weight: 700; font-size: 1.28rem; letter-spacing: -.01em; color: var(--navy); }
.brand__name b { color: var(--amber-deep); font-weight: 700; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { text-decoration: none; color: var(--slate); font-weight: 500; font-size: .96rem; }
.nav a:hover { color: var(--navy); }

/* ---- Breadcrumb --------------------------------------------------------- */
.crumbs { font-size: .86rem; color: var(--slate); padding: 18px 0 0; }
.crumbs a { text-decoration: none; color: var(--slate); }
.crumbs a:hover { color: var(--amber-deep); }
.crumbs span { color: var(--navy); }
.crumbs i { font-style: normal; color: var(--line); margin: 0 8px; }

/* ---- Page hero ---------------------------------------------------------- */
.page-head { padding: 14px 0 8px; }
.page-head h1 { font-size: clamp(1.9rem, 1.2rem + 2.4vw, 2.6rem); margin: .1em 0 .25em; letter-spacing: -.015em; }
.page-head p { margin: 0; color: var(--slate); max-width: 60ch; font-size: 1.05rem; }

/* ---- Homepage hero ------------------------------------------------------- */
.hero { padding: 40px 0 20px; position: relative; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--grotesk); font-size: .82rem; font-weight: 600; color: var(--amber-deep);
  background: rgba(242,160,61,.12); border: 1px solid rgba(242,160,61,.3);
  padding: 5px 12px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.2rem, 1.3rem + 3.6vw, 3.4rem); letter-spacing: -.02em; margin: 0 0 .3em; max-width: 15ch;
}
.hero p { font-size: 1.14rem; color: var(--slate); max-width: 56ch; margin: 0 0 26px; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
  font-family: var(--grotesk); font-weight: 600; font-size: .98rem;
  padding: 12px 20px; border-radius: var(--radius-sm);
}
.btn--primary { background: var(--navy); color: #fff; }
.btn--primary:hover { background: var(--navy-soft); color: #fff; }
.btn--ghost { background: transparent; color: var(--navy); border: 1px solid var(--line); }
.btn--ghost:hover { border-color: var(--navy); color: var(--navy); }

.hero__stats { display: flex; gap: 30px; margin-top: 34px; flex-wrap: wrap; }
.hero__stat .n { font-family: var(--grotesk); font-weight: 700; font-size: 1.7rem; color: var(--navy); display: block; }
.hero__stat .l { font-size: .85rem; color: var(--slate); }

/* section headings used on homepage between blocks */
.section-head { margin: 54px 0 18px; }
.section-head h2 { font-size: 1.55rem; margin: 0 0 4px; }
.section-head p { margin: 0; color: var(--slate); max-width: 60ch; }

/* coming-soon tool card variant (non-link) */
.tool-card.is-soon { cursor: default; }
.tool-card.is-soon:hover { border-color: var(--line); box-shadow: none; }
.tool-card.is-soon .t { color: var(--slate); }
.tool-card__badge {
  display: inline-block; font-family: var(--grotesk); font-size: .68rem; font-weight: 600;
  letter-spacing: .02em; color: var(--amber-deep); background: rgba(242,160,61,.14);
  padding: 2px 7px; border-radius: 5px; margin-top: 6px;
}

/* trust strip (about/methodology teaser on homepage) */
.trust { background: var(--paper-dim); border-radius: var(--radius); padding: 26px 28px; margin: 54px 0; }
.trust h2 { font-size: 1.25rem; margin: 0 0 8px; }
.trust p { margin: 0 0 12px; color: #26384c; max-width: 68ch; }
.trust a { font-weight: 600; }

/* ---- Calculator layout -------------------------------------------------- */
.calc {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 22px;
  align-items: start;
  margin: 26px 0 12px;
}
@media (max-width: 820px) { .calc { grid-template-columns: 1fr; } }

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel__body { padding: 20px 22px 24px; }

/* worksheet heading with tick marks */
.worksheet-title {
  font-family: var(--grotesk); font-weight: 600; font-size: .82rem;
  color: var(--slate); letter-spacing: .02em;
  padding: 14px 22px; border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 10px;
}
.worksheet-title::before {
  content: ""; width: 34px; height: 10px; flex: 0 0 auto;
  background-image: repeating-linear-gradient(90deg, var(--amber) 0 2px, transparent 2px 8px);
  align-self: flex-end; margin-bottom: 4px;
}

/* ---- Shape tabs (segmented) -------------------------------------------- */
.shapes { display: flex; gap: 4px; padding: 6px; background: var(--paper-dim); border-radius: var(--radius-sm); margin-bottom: 20px; }
.shape-tab {
  flex: 1; border: 0; background: transparent; cursor: pointer;
  font-family: var(--sans); font-size: .95rem; font-weight: 500; color: var(--slate);
  padding: 9px 10px; border-radius: 5px; line-height: 1.2;
}
.shape-tab[aria-selected="true"] { background: var(--paper); color: var(--navy); font-weight: 600; box-shadow: 0 1px 2px rgba(19,42,67,.1); }
.shape-tab:hover:not([aria-selected="true"]) { color: var(--navy); }

/* ---- Fields ------------------------------------------------------------- */
.field { margin-bottom: 16px; }
.field > label { display: block; font-size: .9rem; font-weight: 500; color: var(--navy); margin-bottom: 6px; }
.field .hint { font-size: .8rem; color: var(--slate); font-weight: 400; }

.control { display: flex; }
.control input {
  flex: 1 1 auto; min-width: 0;
  font-family: var(--sans); font-size: 1rem; color: var(--navy);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 11px 12px;
}
.control.has-unit input { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.control select {
  flex: 0 0 auto; width: 74px;
  font-family: var(--sans); font-size: .95rem; color: var(--navy);
  background: var(--paper-dim); border: 1px solid var(--line); border-left: 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 0 8px; cursor: pointer;
}
.control input:focus, .control select:focus,
.field input:focus {
  outline: none; border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(242,160,61,.28);
  position: relative; z-index: 1;
}
input[type="number"] { -moz-appearance: textfield; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.field--inline { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field--inline .field { margin-bottom: 0; }

.fld-solo {
  width: 100%; font-family: var(--sans); font-size: 1rem; color: var(--navy);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 11px 12px;
}
.fld-solo:focus { outline: none; border-color: var(--navy); box-shadow: 0 0 0 3px rgba(242,160,61,.28); }

.reset-btn {
  margin-top: 6px; background: transparent; border: 1px solid var(--line);
  color: var(--slate); font-family: var(--sans); font-size: .9rem; font-weight: 500;
  padding: 9px 16px; border-radius: var(--radius-sm); cursor: pointer;
}
.reset-btn:hover { border-color: var(--slate); color: var(--navy); }

/* ---- Result card (the hero) -------------------------------------------- */
.result {
  background: var(--navy);
  color: var(--ink-on-navy);
  border-radius: var(--radius);
  overflow: hidden;
  position: sticky; top: 84px;
  box-shadow: 0 10px 30px rgba(19,42,67,.16);
}
@media (max-width: 820px) { .result { position: static; } }
.result__tick {
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--amber) 0 2px, transparent 2px 9px);
}
.result__body { padding: 22px 24px 24px; }
.result__lead { font-family: var(--grotesk); font-size: .82rem; color: var(--mut-on-navy); margin: 0 0 6px; }
.result__figure { display: flex; align-items: baseline; gap: 10px; }
.result__figure .big {
  font-family: var(--grotesk); font-weight: 700;
  font-size: clamp(3rem, 2rem + 5vw, 4.2rem); line-height: .95; color: #fff;
  letter-spacing: -.02em;
}
.result__figure .unit { font-family: var(--grotesk); font-weight: 600; font-size: 1rem; color: var(--amber); }
.result__sub { color: var(--mut-on-navy); font-size: .95rem; margin: 8px 0 0; }
.result__sub b { color: var(--ink-on-navy); font-weight: 600; }

.result__rows { margin-top: 20px; border-top: 1px solid rgba(255,255,255,.12); }
.result__row {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; padding: 11px 0; border-bottom: 1px solid rgba(255,255,255,.09);
}
.result__row .k { color: var(--mut-on-navy); font-size: .93rem; }
.result__row .v { font-family: var(--grotesk); font-weight: 600; color: var(--ink-on-navy); font-size: 1.05rem; }
.result__note { margin: 16px 0 0; font-size: .82rem; color: var(--mut-on-navy); line-height: 1.5; }
.result.is-empty .result__rows, .result.is-empty .result__sub, .result.is-empty .result__note { opacity: .35; }

/* ---- Prose / explainer -------------------------------------------------- */
.prose { max-width: 68ch; margin: 40px 0; }
.prose h2 { font-size: 1.5rem; margin: 1.6em 0 .5em; }
.prose h3 { font-size: 1.12rem; margin: 1.4em 0 .3em; }
.prose p { margin: .5em 0 1em; color: #26384c; }
.prose ul { padding-left: 1.15em; color: #26384c; }
.prose li { margin: .3em 0; }
.prose code {
  background: var(--paper-dim); border: 1px solid var(--line); border-radius: 4px;
  padding: .06em .4em; font-size: .92em; font-family: var(--grotesk);
}

/* ---- FAQ ---------------------------------------------------------------- */
.faq { max-width: 68ch; margin: 36px 0; }
.faq h2 { font-size: 1.5rem; margin: 0 0 .4em; }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary {
  cursor: pointer; list-style: none; padding: 14px 28px 14px 0; position: relative;
  font-weight: 600; font-family: var(--grotesk); color: var(--navy); font-size: 1.02rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 12px;
  font-family: var(--grotesk); font-weight: 500; color: var(--amber-deep); font-size: 1.3rem;
}
.faq details[open] summary::after { content: "\2013"; }
.faq details p { margin: 0 0 16px; color: #26384c; }

/* ---- Related calculators grid ------------------------------------------ */
.related { margin: 46px 0; }
.related h2 { font-size: 1.4rem; margin: 0 0 4px; }
.related .lede { color: var(--slate); margin: 0 0 18px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; }
.tool-card {
  display: block; text-decoration: none; background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 15px 16px;
}
.tool-card:hover { border-color: var(--amber); box-shadow: var(--shadow); }
.tool-card .t { font-family: var(--grotesk); font-weight: 600; color: var(--navy); display: block; }
.tool-card .d { font-size: .85rem; color: var(--slate); margin-top: 2px; display: block; }
.tool-card[aria-current="page"] { background: var(--navy); border-color: var(--navy); }
.tool-card[aria-current="page"] .t { color: #fff; }
.tool-card[aria-current="page"] .d { color: var(--mut-on-navy); }

/* ---- Footer ------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--line); margin-top: 30px; background: var(--paper); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 14px 30px; align-items: center; justify-content: space-between; padding-top: 26px; padding-bottom: 30px; }
.site-footer .foot-brand { font-family: var(--grotesk); font-weight: 700; color: var(--navy); }
.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: var(--slate); text-decoration: none; font-size: .92rem; }
.site-footer a:hover { color: var(--navy); }
.disclaimer { flex-basis: 100%; color: var(--slate); font-size: .8rem; line-height: 1.5; margin: 0; }

/* ---- A11y / motion ------------------------------------------------------ */
:focus-visible { outline: 2px solid var(--amber-deep); outline-offset: 2px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--navy); color: #fff; padding: 10px 14px; border-radius: 0 0 8px 0; z-index: 100; }
.skip:focus { left: 0; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* mobile nav: hide secondary links, keep it simple & robust */
@media (max-width: 560px) {
  .nav { gap: 16px; }
  .nav a.nav--hide-sm { display: none; }
  body { font-size: 16px; }
  .panel__body { padding: 18px 16px 20px; }
  .result__body { padding: 20px 18px; }
}