/* Sparkbox catalogue sheet.
   Visual system: engineering drawing — pale drafting paper, navy ink, one
   red annotation colour. Registration marks at the sheet corners, a parts
   list with dotted leaders, and a title block along the bottom edge. */

:root {
  --paper:      #e9ecf0;
  --paper-2:    #dde2e8;
  --paper-3:    #f4f6f8;
  --ink:        #16233c;
  --ink-2:      #43536e;
  --ink-3:      #6d7c94;
  --rule:       #b3bcc8;
  --rule-soft:  #cbd2db;
  --red:        #b83c10;
  --green:      #1f5b3d;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans:  system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono:  ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: #d3d8de;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  padding: clamp(10px, 3vw, 34px);
}

.sheet {
  position: relative;
  max-width: 62rem;
  margin: 0 auto;
  background: var(--paper);
  background-image:
    linear-gradient(var(--paper-3) 0%, var(--paper-3) 100%);
  border: 1px solid var(--ink);
  padding: clamp(22px, 4.5vw, 54px) clamp(20px, 4.5vw, 56px) 0;
  box-shadow: 0 1px 0 rgba(22, 35, 60, .25);
}

/* Corner registration crosses — drafting sheet marks, not decoration. */
.reg {
  position: absolute;
  width: 11px;
  height: 11px;
  pointer-events: none;
}
.reg::before, .reg::after {
  content: "";
  position: absolute;
  background: var(--ink);
  opacity: .55;
}
.reg::before { left: 0; top: 5px; width: 11px; height: 1px; }
.reg::after  { top: 0; left: 5px; width: 1px; height: 11px; }
.reg.tl { top: 11px;    left: 11px; }
.reg.tr { top: 11px;    right: 11px; }
.reg.bl { bottom: 11px; left: 11px; }
.reg.br { bottom: 11px; right: 11px; }

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 28px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--ink);
}

.mark { display: flex; flex-direction: column; gap: 2px; }

.markname {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 8.5vw, 4.6rem);
  line-height: .92;
  letter-spacing: -.02em;
  font-weight: 400;
}

.marksub {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .01em;
  color: var(--ink-2);
}

.meta {
  display: flex;
  gap: 26px;
  margin: 0;
  font-family: var(--mono);
  font-size: .72rem;
}
.meta div { display: flex; flex-direction: column; gap: 1px; }
.meta dt { color: var(--ink-3); letter-spacing: .06em; }
.meta dd { margin: 0; color: var(--ink); }

/* ---------- intro ---------- */

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 8px 40px;
  padding: 26px 0 30px;
  border-bottom: 1px solid var(--rule);
}

.lede {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.12rem, 2.3vw, 1.42rem);
  line-height: 1.45;
  max-width: 46ch;
}

.fine {
  margin: 0;
  align-self: end;
  font-family: var(--mono);
  font-size: .74rem;
  line-height: 1.5;
  color: var(--ink-2);
  border-left: 2px solid var(--red);
  padding-left: 12px;
}

/* ---------- sections ---------- */

section { padding: 30px 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: none; }

.sech {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: .74rem;
  font-weight: 400;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: 12px;
}
.sech::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule-soft);
}

/* ---------- parts list ---------- */

.parts { list-style: none; margin: 0; padding: 0; }

.part {
  display: grid;
  grid-template-columns: 5.4rem minmax(0, 1fr) auto;
  gap: 4px 18px;
  padding: 20px 0;
  border-top: 1px solid var(--rule-soft);
}
.part:first-child { border-top: 0; padding-top: 4px; }

.pno {
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--ink-3);
  padding-top: .35rem;
  letter-spacing: .02em;
}

.pbody { min-width: 0; }

.pbody h3 {
  margin: 0 0 5px;
  font-family: var(--serif);
  font-size: 1.42rem;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -.01em;
}
.pbody h3 a { color: inherit; text-decoration: none; }
.pbody h3 a:hover { color: var(--red); }
.pbody h3 a:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
}

.pdesc {
  margin: 0 0 7px;
  max-width: 62ch;
  color: var(--ink-2);
  font-size: .95rem;
}

.pmeta {
  margin: 0;
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--ink-3);
}
.pmeta a { color: var(--ink-2); }

.pprice {
  align-self: start;
  font-family: var(--mono);
  font-size: 1.12rem;
  color: var(--ink);
  padding-top: .2rem;
  white-space: nowrap;
}
.pprice .per { font-size: .72rem; color: var(--ink-3); }

/* ---------- free section ---------- */

.free {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 26px 40px;
}
.free h3 {
  margin: 0 0 5px;
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 400;
}
.free p { margin: 0 0 6px; color: var(--ink-2); font-size: .93rem; max-width: 48ch; }
.free em { color: var(--red); font-style: normal; }

/* ---------- steps ---------- */

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 24px 34px;
}
.steps li { counter-increment: step; }
.steps h3 {
  margin: 0 0 5px;
  font-family: var(--mono);
  font-size: .74rem;
  font-weight: 400;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.steps h3::before {
  content: counter(step) " / ";
  color: var(--red);
}
.steps p { margin: 0; color: var(--ink-2); font-size: .93rem; max-width: 40ch; }

/* ---------- title block ---------- */

.titleblock {
  margin: 34px calc(clamp(20px, 4.5vw, 56px) * -1) 0;
  border-top: 2px solid var(--ink);
  display: grid;
  grid-template-columns: 2.2fr 1.4fr 1fr .6fr 1fr;
  background: var(--paper-2);
}

.tbcell {
  padding: 11px 14px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.tbcell.tb-last { border-right: 0; }

.tbk {
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.tbv {
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--ink);
  overflow-wrap: anywhere;
}
.tb-name .tbv { font-size: .84rem; }

/* ---------- buy page ---------- */

.buy {
  max-width: 46rem;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: clamp(22px, 4.5vw, 48px);
  box-shadow: 0 1px 0 rgba(22, 35, 60, .25);
}

.buy h1 {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -.02em;
}

.buy .partno {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--ink-3);
  letter-spacing: .06em;
  margin: 0 0 22px;
  display: block;
}

.buy .price {
  font-family: var(--mono);
  font-size: 1.5rem;
  margin: 0 0 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule);
}

.buy h2 {
  font-family: var(--mono);
  font-size: .74rem;
  font-weight: 400;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 30px 0 12px;
}

.buy ul { margin: 0 0 18px; padding-left: 1.15rem; }
.buy li { margin-bottom: 7px; color: var(--ink-2); }

.buy .notlist { color: var(--ink-3); font-size: .9rem; }

.invoice {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--red);
  padding: 18px 20px;
  margin: 24px 0 18px;
}
.invoice h3 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 400;
}
.invoice p { margin: 0 0 10px; font-size: .93rem; color: var(--ink-2); }
.invoice .email {
  font-family: var(--mono);
  font-size: .88rem;
  color: var(--ink);
  word-break: break-all;
}

.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: .82rem;
  letter-spacing: .04em;
  padding: 11px 18px;
  border-radius: 2px;
  text-decoration: none;
  border: 1px solid var(--ink);
}
.btn:hover { background: var(--red); border-color: var(--red); }
.btn:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; }

.back {
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--ink-2);
  text-decoration: none;
  display: inline-block;
  margin-top: 26px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  width: 100%;
}
.back:hover { color: var(--red); }

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .intro { grid-template-columns: 1fr; gap: 18px; }
  .fine { border-left: 0; border-top: 2px solid var(--red); padding: 10px 0 0; }
  .part { grid-template-columns: 4.6rem minmax(0, 1fr); }
  .pprice { grid-column: 2; padding-top: 4px; }
  .titleblock { grid-template-columns: 1fr 1fr; }
  .tbcell { border-bottom: 1px solid var(--rule); }
  .tbcell.tb-name { grid-column: 1 / -1; }
  .tb-last { border-right: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ---------- order form ---------- */

.hfield { margin: 0 0 12px; }
.hfield label {
  display: block;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--ink-2);
  margin-bottom: 4px;
}
.hfield input {
  width: 100%;
  font: inherit;
  font-size: .95rem;
  color: var(--ink);
  background: var(--paper-3);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 9px 11px;
}
.hfield input:focus {
  outline: 2px solid var(--red);
  outline-offset: 1px;
  border-color: var(--red);
}
.hfield .btn { border: 0; cursor: pointer; font-family: var(--mono); font-size: .82rem; }
.hfield .btn:disabled { opacity: .6; cursor: default; }

/* Honeypot: hidden from people, irresistible to bots. */
.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}