/* Defineweb — bench palette: ESD mat grey-green, near-black ink,
   ESD pink used only where a syntax highlighter colours a string. */

:root {
  --bg:        #e6e9e4;
  --surface:   #f3f4f1;
  --ink:       #14181c;
  --muted:     #5c646c;
  --line:      #cbd0c9;
  --rose:      #b3325c;
  --rose-pale: #f6cfd9;

  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body:    "Newsreader", Georgia, "Times New Roman", serif;
  --mono:    "DM Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --gutter: clamp(1.25rem, 5vw, 4rem);
  --measure: 62ch;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  line-height: 1.62;
  font-variant-numeric: tabular-nums lining-nums;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.wrap {
  width: 100%;
  max-width: 68rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: -9999px;
  background: var(--ink);
  color: var(--bg);
  padding: 0.6rem 1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
}
.skip:focus { left: 0.5rem; top: 0.5rem; z-index: 10; }

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

/* ---------- top bar ---------- */

.topbar {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.5rem;
}

.wordmark {
  font-family: var(--display);
  font-variation-settings: "wdth" 108;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.wordmark .dot {
  width: 0.42rem;
  height: 0.42rem;
  background: var(--rose);
  display: inline-block;
}

.topbar nav {
  display: flex;
  gap: clamp(0.9rem, 3vw, 2rem);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

.topbar nav a {
  text-decoration: none;
  color: var(--muted);
  padding-block: 0.25rem;
  border-bottom: 1px solid transparent;
}
.topbar nav a:hover { color: var(--ink); border-bottom-color: var(--rose); }

/* ---------- hero ---------- */

.hero {
  /* 2.54 mm perfboard pitch, very faint */
  background-image: radial-gradient(circle at 1px 1px, rgba(20, 24, 28, 0.085) 1px, transparent 0);
  background-size: 24px 24px;
  background-position: center top;
  border-bottom: 1px solid var(--line);
  padding-block: clamp(3.5rem, 9vw, 7rem) clamp(3rem, 7vw, 5.5rem);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 25%, var(--bg) 96%);
  pointer-events: none;
}

.hero > .wrap { position: relative; z-index: 1; }

.defines {
  margin: 0 0 clamp(2rem, 5vw, 3rem);
  font-family: var(--mono);
  font-size: clamp(0.78rem, 0.62rem + 0.75vw, 0.98rem);
  line-height: 1.9;
  color: var(--ink);
}

.def {
  display: grid;
  grid-template-columns: 7ch 10ch 1fr;
  column-gap: 1.5ch;
  animation: rise 0.6s cubic-bezier(0.2, 0.7, 0.3, 1) backwards;
  animation-delay: calc(var(--i) * 90ms);
}

.def::before {
  content: "#define";
  color: var(--muted);
}

.def dt {
  font-weight: 500;
  letter-spacing: 0.02em;
}

.def dd {
  margin: 0;
  color: var(--rose);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(0.5rem); }
}

.display {
  font-family: var(--display);
  font-variation-settings: "wdth" 112;
  font-weight: 600;
  font-size: clamp(2.2rem, 1.2rem + 4.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.021em;
  margin: 0 0 1.4rem;
  max-width: 27ch;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.3, 1) 0.42s backwards;
}

.lede {
  max-width: var(--measure);
  font-size: 1.13em;
  color: color-mix(in srgb, var(--ink) 88%, var(--bg));
  margin: 0 0 2rem;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.3, 1) 0.52s backwards;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.3, 1) 0.6s backwards;
}

.btn {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  background: var(--ink);
  color: var(--bg);
  padding: 0.72rem 1.15rem;
  border: 1px solid var(--ink);
  transition: background 0.18s ease, color 0.18s ease;
}
.btn:hover { background: var(--rose); border-color: var(--rose); color: #fff; }

.btn-quiet {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-quiet:hover { background: var(--rose-pale); border-color: var(--rose); color: var(--ink); }

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

.row {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding-block: clamp(3rem, 7vw, 5rem);
  border-bottom: 1px solid var(--line);
}
.row:last-of-type { border-bottom: 0; }

.label {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0.45rem 0 0;
  align-self: start;
}

.row-body { min-width: 0; }

.row-intro {
  max-width: var(--measure);
  font-size: 1.13em;
  margin: 0 0 2rem;
}

.card { max-width: var(--measure); }
.card + .card { margin-top: 2.4rem; }

.key {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--rose);
  margin: 0 0 0.35rem;
  letter-spacing: 0.02em;
}

.card h3 {
  font-family: var(--display);
  font-variation-settings: "wdth" 105;
  font-weight: 600;
  font-size: 1.32rem;
  letter-spacing: -0.012em;
  margin: 0 0 0.5rem;
}

.card p:last-child { margin: 0; color: color-mix(in srgb, var(--ink) 86%, var(--bg)); }

/* datasheet-style parameter table */

.spec {
  margin: 0;
  border-top: 1px solid var(--line);
  max-width: 46rem;
}

.spec > div {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 0.25rem 1.5rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.spec dt {
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  padding-top: 0.22rem;
}

.spec dd { margin: 0; }

.spec-contact dd {
  font-family: var(--mono);
  font-size: 0.9rem;
}

.spec-contact a {
  color: var(--rose);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.fineprint {
  max-width: var(--measure);
  margin: 1.75rem 0 0;
  color: var(--muted);
  font-size: 0.95em;
}

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding-block: 1.5rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--muted);
}

.footer-inner p { margin: 0; }
.footer-inner a { color: var(--muted); text-underline-offset: 3px; }
.footer-inner a:hover { color: var(--rose); }

/* ---------- legal pages ---------- */

.doc {
  max-width: 46rem;
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.doc h1 {
  font-family: var(--display);
  font-variation-settings: "wdth" 110;
  font-weight: 600;
  font-size: clamp(1.9rem, 1.3rem + 2.4vw, 2.8rem);
  letter-spacing: -0.018em;
  line-height: 1.08;
  margin: 0 0 0.6rem;
}

.doc h2 {
  font-family: var(--display);
  font-variation-settings: "wdth" 105;
  font-weight: 600;
  font-size: 1.2rem;
  margin: 2.4rem 0 0.5rem;
}

.doc .stamp {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--muted);
  margin: 0 0 2rem;
}

.doc ul { padding-left: 1.1rem; }
.doc li { margin-bottom: 0.35rem; }
.doc a { color: var(--rose); text-underline-offset: 3px; }

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

@media (max-width: 760px) {
  .row { grid-template-columns: 1fr; gap: 1.25rem; }
  .label { margin-top: 0; }
  .spec > div { grid-template-columns: 1fr; }
  .spec dt { padding-top: 0; }
}

@media (max-width: 560px) {
  .topbar nav a:not(:last-child) { display: none; }
  .def { grid-template-columns: 7ch 1fr; }
  .def dd { grid-column: 1 / -1; padding-left: 2ch; }
  .btn { flex: 1 1 auto; text-align: center; }
}

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