:root {
  --paper: #f3ead3;
  --paper-shade: #ece1c2;
  --ink: #0d1b2a;
  --ink-soft: #2a3445;
  --rule: #1a2638;
  --rust: #9a3b1b;
  --rust-soft: #b85a36;
  --grid: rgba(13, 27, 42, 0.07);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
}

body {
  font-family: Rockwell, "Roboto Slab", "Slabo 27px", Georgia, "Times New Roman", serif;
  font-size: 16px;
  line-height: 1.5;
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, var(--grid) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, var(--grid) 23px 24px);
  background-attachment: fixed;
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px clamp(16px, 3vw, 36px) 56px;
}

/* ---------- Top brand bar ---------- */

.brandbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-bottom: 10px;
}

.brandbar .left { font-weight: 700; color: var(--ink); }
.brandbar .right { text-align: right; }

.rule-double {
  border-top: 1px solid var(--rule);
  border-bottom: 3px solid var(--rule);
  height: 4px;
  margin: 0 0 22px;
}

.rule-double.thin {
  border-bottom-width: 1px;
  margin: 22px 0;
}

/* ---------- Headline ---------- */

.masthead { margin: 8px 0 26px; }

.eyebrow {
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--rust);
  margin: 0 0 8px;
}

h1.headline {
  font-family: Rockwell, "Roboto Slab", Georgia, serif;
  font-weight: 900;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  text-transform: uppercase;
}

h1.headline .tm {
  font-size: 0.32em;
  vertical-align: super;
  letter-spacing: 0;
  font-weight: 700;
  color: var(--rust);
}

.subhead {
  font-size: 19px;
  font-style: italic;
  line-height: 1.4;
  margin: 0;
  max-width: 56ch;
  color: var(--ink-soft);
}

/* ---------- Two-column body ---------- */

.body-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 36px;
  margin-top: 18px;
}

@media (max-width: 760px) {
  .body-grid { grid-template-columns: 1fr; gap: 24px; }
}

.lede h2,
.diagram h2,
.specs h2,
.literature h2 {
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 6px;
  margin: 0 0 14px;
}

.lede p {
  margin: 0 0 14px;
  text-align: justify;
  hyphens: auto;
}

.lede .dropcap::first-letter {
  font-family: Rockwell, "Roboto Slab", Georgia, serif;
  font-weight: 900;
  font-size: 3.6em;
  line-height: 0.85;
  float: left;
  padding: 4px 8px 0 0;
  color: var(--rust);
}

.pullquote {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 12px 0;
  margin: 18px 0;
  font-style: italic;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.pullquote cite {
  display: block;
  font-style: normal;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 6px;
}

/* ---------- Diagram ---------- */

.diagram {
  border: 1px solid var(--rule);
  background: var(--paper-shade);
  padding: 14px;
  align-self: start;
}

.diagram .frame {
  border: 1px solid var(--rule);
  padding: 8px;
  background: var(--paper);
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.diagram .caption {
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-align: center;
  margin-top: 8px;
}

.legend {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.5;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 14px;
}

@media (max-width: 480px) { .legend { grid-template-columns: 1fr; } }

.legend li { display: flex; gap: 8px; align-items: baseline; }

.legend .num {
  display: inline-block;
  min-width: 18px;
  height: 18px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  text-align: center;
  line-height: 16px;
  font-size: 10px;
  font-weight: 700;
  flex: 0 0 auto;
}

/* ---------- Spec sheet ---------- */

.specs {
  margin-top: 6px;
  border: 1px solid var(--rule);
  padding: 14px 16px 18px;
  background: var(--paper-shade);
}

.specs table {
  width: 100%;
  border-collapse: collapse;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 13px;
}

.specs th, .specs td {
  text-align: left;
  padding: 7px 8px;
  border-bottom: 1px dotted var(--ink-soft);
  vertical-align: top;
}

.specs th {
  width: 42%;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 11px;
  color: var(--ink);
}

.specs tr:last-child th, .specs tr:last-child td { border-bottom: none; }

.specs .footnote {
  margin: 12px 0 0;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- Literature reply card ---------- */

.literature {
  margin-top: 6px;
  border: 3px double var(--ink);
  padding: 18px 20px 22px;
  background: var(--paper);
  position: relative;
}

.literature::before {
  content: "REPLY CARD · NO POSTAGE NECESSARY IF MAILED IN U.S.A.";
  position: absolute;
  top: -10px;
  left: 18px;
  background: var(--paper);
  padding: 0 8px;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.literature h2 {
  font-family: Rockwell, "Roboto Slab", Georgia, serif;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 22px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 6px;
  margin: 0 0 14px;
  color: var(--ink);
}

.literature .preamble {
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 12px;
  margin: 0 0 16px;
  color: var(--ink-soft);
  line-height: 1.5;
}

.checks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 18px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 12px;
}

@media (max-width: 520px) { .checks { grid-template-columns: 1fr; } }

.checks li { display: flex; align-items: center; gap: 8px; }

.checks input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border: 1px solid var(--ink);
  background: var(--paper);
  margin: 0;
  cursor: pointer;
  flex: 0 0 auto;
}

.checks input[type="checkbox"]:checked {
  background:
    linear-gradient(45deg, transparent 45%, var(--ink) 45%, var(--ink) 55%, transparent 55%),
    linear-gradient(-45deg, transparent 45%, var(--ink) 45%, var(--ink) 55%, transparent 55%),
    var(--paper);
}

.fields {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px 14px;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 11px;
}

.fields label {
  display: flex;
  flex-direction: column;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  gap: 2px;
}

.fields .col-3 { grid-column: span 3; }
.fields .col-2 { grid-column: span 2; }
.fields .col-4 { grid-column: span 4; }
.fields .col-6 { grid-column: span 6; }

@media (max-width: 600px) {
  .fields { grid-template-columns: repeat(2, 1fr); }
  .fields .col-3, .fields .col-2, .fields .col-4, .fields .col-6 { grid-column: span 2; }
}

.fields input[type="text"] {
  appearance: none;
  border: 0;
  border-bottom: 1px solid var(--ink);
  background: transparent;
  padding: 4px 2px 3px;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink);
  border-radius: 0;
}

.fields input[type="text"]:focus {
  outline: none;
  background: rgba(154, 59, 27, 0.06);
  border-bottom-color: var(--rust);
}

.submit-row {
  margin-top: 18px;
  display: flex;
  justify-content: flex-end;
}

button.mail {
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 10px 18px;
  cursor: pointer;
  font-weight: 700;
}

button.mail:hover { background: var(--rust); border-color: var(--rust); }
button.mail:focus { outline: 2px solid var(--rust); outline-offset: 2px; }

.thanks {
  border: 3px double var(--ink);
  padding: 24px 22px;
  background: var(--paper-shade);
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 14px;
  line-height: 1.55;
  transition: opacity 250ms ease;
}

.thanks h3 {
  font-family: Rockwell, "Roboto Slab", Georgia, serif;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 8px;
  color: var(--rust);
}

@media (prefers-reduced-motion: reduce) {
  .thanks { transition: none; }
}

/* ---------- Footer ---------- */

.colophon {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 24px;
  font-family: "Courier New", Courier, ui-monospace, monospace;
  font-size: 11px;
  line-height: 1.55;
  color: var(--ink-soft);
}

@media (max-width: 600px) { .colophon { grid-template-columns: 1fr; } }

.colophon p { margin: 0 0 6px; }
.colophon .stamp { color: var(--rust); font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; }

.parody {
  border: 1px dashed var(--ink-soft);
  padding: 8px 10px;
  text-align: center;
  letter-spacing: 0.18em;
  font-size: 10px;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* small print at the very bottom */
.colophon .smallprint {
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* utility */
.spacer-lg { height: 28px; }
.spacer-md { height: 18px; }