:root {
  --bg: #071018;
  --panel: #0c1621;
  --panel-2: #111e2b;
  --text: #e4eef8;
  --muted: #97aabb;
  --line: rgba(102, 141, 171, 0.22);
  --accent: #7fe0ff;
  --accent-2: #ffd166;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Consolas, "Courier New", monospace;
  color: var(--text);
  background:
    radial-gradient(520px 260px at 100% 0%, rgba(127, 224, 255, 0.1), transparent 46%),
    linear-gradient(180deg, #09111b, #050b12);
}

.tech-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1rem;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 24, 34, 0.98), rgba(8, 15, 22, 0.98));
}

.brand-mark svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: #7fe0ff;
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand-copy {
  display: grid;
  gap: 0.08rem;
}

.brand-copy strong {
  letter-spacing: 0.04em;
}

.brand-copy small {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  font-size: 0.62rem;
}

.topnav {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.topnav a {
  color: var(--text);
  text-decoration: none;
  padding: 0.42rem 0.76rem;
  border-radius: 999px;
  border: 1px solid transparent;
}

.topnav a:hover,
.topnav a[aria-current="page"] {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.hero,
.panel,
.code-callout,
.list {
  border: 1px solid var(--line);
  background: var(--panel);
}

.lab-layout {
  margin-top: 0.8rem;
  border-radius: 24px;
  padding: 1rem;
  display: grid;
  gap: 1rem;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
}

h1,
h2 {
  font-family: "Lucida Console", Consolas, monospace;
}

h1 {
  margin: 0.45rem 0;
  max-width: 14ch;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 0.95;
}

.lead,
p,
li {
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.85rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(127, 224, 255, 0.22);
  color: var(--accent);
  text-decoration: none;
  background: rgba(127, 224, 255, 0.05);
  font-weight: 700;
}

.schematic {
  position: relative;
  min-height: 320px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at top right, rgba(255, 209, 102, 0.08), transparent 32%),
    linear-gradient(180deg, #0e1824, #0a121b);
  overflow: hidden;
}

.schematic__grid {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(127, 224, 255, 0.05) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(90deg, rgba(127, 224, 255, 0.05) 1px, transparent 1px) 0 0 / 40px 40px;
}

.schematic__node {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 18px rgba(127, 224, 255, 0.42);
}

.schematic__node--one {
  top: 74px;
  left: 64px;
}

.schematic__node--two {
  top: 154px;
  right: 92px;
}

.schematic__node--three {
  bottom: 68px;
  left: 148px;
  background: var(--accent-2);
  box-shadow: 0 0 18px rgba(255, 209, 102, 0.32);
}

.schematic__trace {
  position: absolute;
  background: linear-gradient(90deg, rgba(127, 224, 255, 0.4), rgba(127, 224, 255, 0.1));
}

.schematic__trace--one {
  top: 81px;
  left: 80px;
  width: 150px;
  height: 2px;
}

.schematic__trace--two {
  top: 82px;
  left: 230px;
  width: 2px;
  height: 90px;
}

.schematic__trace--three {
  bottom: 77px;
  left: 148px;
  width: 190px;
  height: 2px;
}

.card-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.panel,
.code-callout,
.list {
  border-radius: 18px;
  padding: 1rem;
}

pre {
  margin: 0;
  padding: 0.9rem;
  border-radius: 12px;
  background: #02070c;
  border: 1px solid rgba(127, 224, 255, 0.12);
  overflow: auto;
}

code {
  color: #8de4ff;
}

.list ul {
  margin: 0.6rem 0 0;
  padding-left: 1.2rem;
}

.list li + li {
  margin-top: 0.45rem;
}

@media (min-width: 920px) {
  .lab-layout {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 390px);
    align-items: stretch;
  }
}

@media (max-width: 760px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}