:root {
  --ink: #11171b;
  --paper: #eef0ed;
  --line: rgba(17, 23, 27, .22);
  --soft-line: rgba(238, 240, 237, .25);
  --cyan: #20c8c2;
  --red: #f0594f;
  --muted: #687278;
  --max: 1320px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Mono", Consolas, monospace;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.signal-site { overflow: hidden; }
.signal-header {
  width: min(calc(100% - 72px), var(--max));
  height: 76px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
  font-size: .7rem;
}
.signal-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1rem;
  font-weight: 700;
}
.signal-dot { width: 11px; height: 11px; background: var(--cyan); border-radius: 50%; }
.header-code { justify-self: center; color: var(--muted); }
.header-link { justify-self: end; color: var(--red); }
.header-link span { display: inline-block; margin-left: 8px; font-size: 1rem; }

.signal-hero {
  min-height: calc(100vh - 76px);
  position: relative;
  display: flex;
  align-items: flex-end;
  color: #f2f4f0;
  isolation: isolate;
}
.hero-image {
  position: absolute;
  inset: 0;
  z-index: -3;
  background: url("../assets/signal-city.png") center 43% / cover no-repeat;
}
.hero-shade { position: absolute; inset: 0; z-index: -2; background: rgba(8, 17, 22, .64); }
.hero-grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: .32;
  background-image: linear-gradient(rgba(238, 240, 237, .16) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 240, 237, .16) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, transparent 0, black 24%, black 100%);
}
.hero-content {
  width: min(calc(100% - 72px), var(--max));
  margin: 0 auto;
  padding: 100px 0 104px;
}
.mono-label { margin: 0 0 22px; color: var(--cyan); font-size: .7rem; letter-spacing: .06em; }
h1, h2 { font-family: "Space Grotesk", sans-serif; font-weight: 500; letter-spacing: 0; }
h1 {
  max-width: 820px;
  margin: 0 0 35px;
  font-size: clamp(4.5rem, 10vw, 10.5rem);
  line-height: .86;
}
h1 span, h2 span { color: var(--cyan); }
.hero-copy { max-width: 450px; margin: 0 0 34px; color: rgba(242, 244, 240, .78); font-size: .9rem; }
.outline-link {
  display: inline-flex;
  gap: 18px;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid rgba(242, 244, 240, .6);
  font-size: .72rem;
  transition: border-color .2s ease, color .2s ease, background .2s ease;
}
.outline-link:hover { border-color: var(--cyan); color: var(--cyan); background: rgba(32, 200, 194, .08); }
.hero-meta {
  position: absolute;
  right: max(36px, calc((100% - var(--max)) / 2));
  bottom: 29px;
  display: flex;
  gap: 25px;
  color: rgba(242, 244, 240, .62);
  font-size: .63rem;
}

.system-section, .contact-system {
  width: min(calc(100% - 72px), var(--max));
  margin: 0 auto;
}
.system-section { padding: 130px 0 145px; }
.system-top {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 90px;
  align-items: end;
  padding-bottom: 70px;
}
h2 { margin: 0; font-size: clamp(3.6rem, 7vw, 8rem); line-height: .88; }
.system-lede { max-width: 430px; margin: 0; color: var(--muted); font-size: .85rem; }
.process-table { border-top: 1px solid var(--ink); }
.process-line {
  display: grid;
  grid-template-columns: 90px minmax(235px, 1fr) 1.2fr 75px;
  gap: 20px;
  align-items: center;
  min-height: 118px;
  border-bottom: 1px solid var(--line);
}
.process-id { color: var(--red); font-size: .68rem; }
.process-name { display: flex; flex-direction: column; gap: 7px; }
.process-name strong { font-family: "Space Grotesk", sans-serif; font-size: 1.6rem; font-weight: 500; }
.process-name small { color: var(--muted); font-size: .6rem; }
.process-line p { margin: 0; color: var(--muted); font-size: .76rem; }
.process-state { justify-self: end; color: var(--cyan); font-size: .62rem; }

.signal-band {
  min-height: 270px;
  padding: 52px max(36px, calc((100% - var(--max)) / 2));
  display: grid;
  grid-template-columns: 100px 1fr 60px;
  gap: 35px;
  align-items: center;
  background: var(--ink);
  color: var(--paper);
}
.band-index { align-self: start; color: var(--red); font-size: .68rem; }
.signal-band p {
  max-width: 780px;
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 4vw, 4.5rem);
  line-height: .98;
}
.band-cross { justify-self: end; color: var(--cyan); font-size: 3rem; font-weight: 300; }

.contact-system {
  padding: 135px 0 150px;
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: 120px;
}
.contact-system-copy > p:not(.mono-label) { max-width: 390px; margin: 30px 0 45px; color: var(--muted); font-size: .82rem; }
.contact-readout { padding-top: 18px; border-top: 1px solid var(--line); display: grid; gap: 8px; font-size: .62rem; }
.contact-readout span { color: var(--muted); }
.contact-readout strong { color: var(--red); font-weight: 500; }
.signal-form { padding-top: 5px; }
.signal-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }
.signal-field { display: block; margin-bottom: 27px; }
.signal-field > span { display: block; margin-bottom: 9px; color: var(--muted); font-size: .65rem; text-transform: uppercase; }
.signal-field input, .signal-field select, .signal-field textarea {
  width: 100%;
  padding: 14px 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  outline: none;
  background: transparent;
  color: var(--ink);
  font-size: .78rem;
}
.signal-field textarea { resize: vertical; min-height: 130px; }
.signal-field input:focus, .signal-field select:focus, .signal-field textarea:focus { border-color: var(--cyan); box-shadow: inset 3px 0 0 var(--cyan); }
.signal-field input::placeholder, .signal-field textarea::placeholder { color: #98a0a3; }
.signal-submit {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  font-size: .74rem;
  transition: background .2s ease, color .2s ease;
}
.signal-submit:hover { background: var(--cyan); border-color: var(--cyan); color: var(--ink); }
.signal-submit svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.signal-status { min-height: 21px; margin: 15px 0 0; color: var(--red); font-size: .72rem; }
.signal-footer {
  width: min(calc(100% - 72px), var(--max));
  margin: 0 auto;
  padding: 22px 0 28px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: .62rem;
}

@media (max-width: 860px) {
  .signal-header, .hero-content, .system-section, .contact-system, .signal-footer { width: min(calc(100% - 40px), var(--max)); }
  .header-code { display: none; }
  .signal-header { grid-template-columns: 1fr 1fr; }
  .signal-hero { min-height: 720px; }
  .hero-meta { right: 20px; bottom: 25px; }
  .system-top, .contact-system { grid-template-columns: 1fr; gap: 50px; }
  .system-section, .contact-system { padding: 95px 0 110px; }
  .process-line { grid-template-columns: 75px 1fr 65px; gap: 13px; padding: 22px 0; }
  .process-line p { grid-column: 2 / 4; }
  .signal-band { padding: 45px 20px; grid-template-columns: 55px 1fr 30px; gap: 16px; }
}
@media (max-width: 560px) {
  .signal-header { height: 64px; font-size: .6rem; }
  .signal-brand { font-size: .88rem; }
  .signal-dot { width: 9px; height: 9px; }
  .hero-content { padding: 70px 0 100px; }
  h1 { font-size: clamp(3.8rem, 18vw, 6rem); }
  h2 { font-size: clamp(3.35rem, 16vw, 5rem); }
  .hero-copy { font-size: .78rem; }
  .hero-meta { left: 20px; right: auto; gap: 13px; flex-direction: column; font-size: .55rem; }
  .process-line { grid-template-columns: 58px 1fr 48px; }
  .process-name strong { font-size: 1.25rem; }
  .process-name small, .process-line p { font-size: .58rem; }
  .process-line p { margin-top: 4px; }
  .signal-band { min-height: 300px; grid-template-columns: 1fr 22px; }
  .band-index { grid-column: 1 / 3; }
  .signal-band p { font-size: 2.4rem; }
  .band-cross { grid-column: 2; grid-row: 2; }
  .signal-fields { grid-template-columns: 1fr; gap: 0; }
  .signal-footer { flex-direction: column; gap: 8px; }
}