/* Telex Pad — Telex Pad Editorial
   Distinto de: chalk scoreboard, till tape, packing slip, stamp, plomada, cassette, FIDS */

:root {
  color-scheme: light;
  --greenbar: #c8d6b8;
  --greenbar-2: #dce6d0;
  --paper: #eef2e6;
  --paper-2: #f7f9f2;
  --ribbon: #0096b5;
  --ribbon-deep: #007a94;
  --carbon: #161b18;
  --ink: #1c2420;
  --muted: #4a554e;
  --sprocket: #6a746c;
  --rule: rgba(22, 27, 24, 0.14);
  --display: "Share Tech Mono", "Courier New", monospace;
  --text: "PT Serif", Georgia, serif;
  --shell: 66rem;
  --gutter: clamp(1.1rem, 4vw, 2.6rem);
  --band: clamp(2.4rem, 5vw, 4.2rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    repeating-linear-gradient(
      180deg,
      var(--paper) 0,
      var(--paper) 1.55rem,
      var(--greenbar-2) 1.55rem,
      var(--greenbar-2) 3.1rem
    );
  color: var(--ink);
  font-family: var(--text);
  font-size: clamp(1.05rem, 1rem + 0.2vw, 1.14rem);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--carbon); color: var(--paper); padding: 0.7rem 1rem; z-index: 40;
}
.skip:focus { left: 0.75rem; top: 0.75rem; }
:focus-visible { outline: 3px solid var(--ribbon); outline-offset: 3px; }

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

/* Telex strip mast */
.top {
  background: var(--carbon);
  color: var(--paper);
  border-bottom: 4px solid var(--ribbon);
  position: relative;
}
.top::before,
.top::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  width: 0.85rem;
  background:
    radial-gradient(circle at 50% 0.55rem, transparent 0.22rem, var(--sprocket) 0.24rem, var(--sprocket) 0.34rem, transparent 0.36rem) 0 0 / 100% 0.9rem repeat-y;
  opacity: 0.55;
}
.top::before { left: 0.35rem; }
.top::after { right: 0.35rem; }
.top__row {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
  gap: 0.75rem 1.5rem; padding-block: 1rem 0.55rem;
}
.brand {
  font-family: var(--display);
  font-size: clamp(1.15rem, 0.9rem + 1vw, 1.55rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 0.55rem;
}
.brand__mark {
  width: 1.1rem; height: 1.1rem;
  background: var(--ribbon);
  box-shadow: inset 0 0 0 2px var(--paper);
}
.top__meta {
  font-family: var(--display);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: #aeb8b0;
  text-transform: uppercase;
}
.nav {
  display: flex; flex-wrap: wrap; gap: 0.35rem 1.25rem;
  padding-block: 0.35rem 1rem;
  font-family: var(--display);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.1rem;
}
.nav a:hover,
.nav a[aria-current="page"] { border-bottom-color: var(--ribbon); color: #fff; }

/* Hero as telex confirmation pad */
.hero {
  position: relative;
  padding-block: clamp(2.5rem, 7vw, 4.8rem) clamp(2rem, 5vw, 3.5rem);
  overflow: hidden;
}
.hero__pad {
  position: absolute; inset: 8% 6% auto;
  height: min(52%, 14rem);
  background:
    repeating-linear-gradient(180deg, transparent 0 1.4rem, rgba(0,150,181,0.08) 1.4rem 1.45rem),
    linear-gradient(90deg, var(--greenbar) 0 12%, var(--paper-2) 12% 88%, var(--greenbar) 88%);
  border: 1px solid var(--rule);
  box-shadow: 0 18px 40px rgba(22, 27, 24, 0.08);
  pointer-events: none;
  opacity: 0.55;
}
.hero__pad::before {
  content: "TELEX · CONFIRMATION PAD · MSG REF 09";
  position: absolute; top: 0.7rem; left: 1rem; right: 1rem;
  font-family: var(--display);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ribbon-deep);
}
@media (prefers-reduced-motion: no-preference) {
  .hero__pad {
    animation: pad-in 900ms ease-out both;
  }
  @keyframes pad-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 0.55; transform: none; }
  }
}
.hero__content { position: relative; max-width: 42rem; }
.hero__brand {
  font-family: var(--display);
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ribbon-deep);
  margin: 0 0 0.85rem;
}
.hero h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.55rem, 1.1rem + 2.1vw, 2.45rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
  margin: 0 0 1rem;
  color: var(--carbon);
}
.hero__stand {
  margin: 0;
  color: var(--muted);
  max-width: 36rem;
  font-size: 1.05em;
}

.block { padding-block: var(--band); }
.block--tint {
  background: rgba(238, 242, 230, 0.82);
  border-block: 1px solid var(--rule);
}
.block--rail {
  background: var(--carbon);
  color: var(--paper);
}
.block--rail h2,
.block--rail .eyebrow { color: var(--paper); }
.block--rail a { color: #7fd4e6; }
.eyebrow {
  font-family: var(--display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ribbon-deep);
  margin: 0 0 0.55rem;
}
h2 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.25rem, 1rem + 1.1vw, 1.7rem);
  letter-spacing: 0.03em;
  margin: 0 0 1rem;
}
.lede {
  display: grid;
  gap: 1rem;
  max-width: 48rem;
}
.lede p { margin: 0; }

.library { display: grid; gap: 1.1rem; }
.card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.25rem;
  padding: 1.15rem 1.2rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--ribbon);
}
.card__id {
  font-family: var(--display);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ribbon-deep);
  margin: 0.15rem 0 0;
  white-space: nowrap;
}
.card h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  line-height: 1.35;
  margin: 0 0 0.45rem;
}
.card h3 a { color: var(--carbon); text-decoration: none; }
.card h3 a:hover { color: var(--ribbon-deep); text-decoration: underline; }
.card p { margin: 0; color: var(--muted); font-size: 0.98em; }

.standards {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 0.9rem; max-width: 48rem;
}
.standards li {
  padding: 0.85rem 0 0.85rem 1rem;
  border-left: 3px solid var(--ribbon);
  background: rgba(255,255,255,0.35);
}
.standards strong { font-family: var(--display); font-weight: 400; letter-spacing: 0.03em; }

.defs { margin: 0; max-width: 48rem; }
.defs dt {
  font-family: var(--display);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  margin-top: 1rem;
}
.defs dd { margin: 0.25rem 0 0; color: inherit; opacity: 0.92; }
.block--rail .defs dd { color: #c5cec7; }
.flag {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border: 1px dashed rgba(127, 212, 230, 0.55);
  font-size: 0.98em;
}
.flag p { margin: 0; }

.article__head { padding-block: clamp(2rem, 5vw, 3.2rem) 0.5rem; }
.article__meta {
  font-family: var(--display);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem;
}
.prose { max-width: 42rem; }
.prose h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.45rem, 1.05rem + 1.6vw, 2.1rem);
  letter-spacing: 0.02em;
  line-height: 1.28;
  margin: 0.4rem 0 0.85rem;
}
.prose h2 {
  margin-top: 1.8rem;
}
.prose p { margin: 0 0 1rem; }
.prose ul { margin: 0 0 1rem; padding-left: 1.2rem; }
.prose li { margin-bottom: 0.4rem; }
.backlink {
  font-family: var(--display);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ribbon-deep);
  text-decoration: none;
}
.backlink:hover { text-decoration: underline; }

.foot {
  background: var(--carbon);
  color: #aeb8b0;
  padding-block: 1.6rem 2rem;
  margin-top: 1rem;
}
.foot a { color: #7fd4e6; text-decoration: none; }
.foot a:hover { text-decoration: underline; }
.foot__nav {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.1rem;
  font-family: var(--display);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}
.foot__note { margin: 0; font-size: 0.92em; }

@media (max-width: 640px) {
  .card { grid-template-columns: 1fr; }
  .top::before, .top::after { display: none; }
}

@media (prefers-reduced-motion: no-preference) {
  .nav a { transition: border-color 160ms ease, color 160ms ease; }
  .card { transition: transform 180ms ease, box-shadow 180ms ease; }
  .card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(22,27,24,0.08); }
}