:root {
  --bg: #000;
  --fg: #e9edf5;
  --muted: #8b93a3;
  --line: rgba(255, 255, 255, 0.12);
  --accent: #ffd666;                          /* same yellow as on the LED wall */
  --accent-soft: rgba(255, 214, 102, 0.14);
  --accent-glow: rgba(255, 214, 102, 0.55);
}

* { box-sizing: border-box; }

html { background: var(--bg); }

::selection { background: var(--accent); color: #000; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--fg);
  font: 15px/1.65 ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  /* faint LED grid in the background */
  background:
    radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.75) 100%),
    radial-gradient(circle, rgba(255, 255, 255, 0.07) 1.3px, transparent 1.6px) 0 0 / 8px 8px,
    var(--bg);
  background-attachment: fixed;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 16px 80px;
}

/* logo-led.png has 6 % transparent padding on every side for the glow;
   pull it out so the LEDs line up with the text */
.logo {
  --w: min(260px, 60vw);
  display: block;
  width: var(--w);
  height: auto;
  margin: calc(var(--w) * -0.06) 0 calc(40px - var(--w) * 0.06) calc(var(--w) * -0.06);
}

h1 {
  font-size: 22px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 32px;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.45);
}

/* a short glowing yellow LED bar under the page title */
h1::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  margin-top: 14px;
  border-radius: 1px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}

h2 {
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 36px 0 10px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

/* single yellow "LED" in front of every section heading */
h2::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin: 0 10px 2px 0;
  border-radius: 1.5px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  vertical-align: middle;
}

p, ul { margin: 0 0 14px; }
ul { padding-left: 20px; }
li::marker { color: var(--accent); }

a { color: var(--accent); text-underline-offset: 3px; text-decoration-color: rgba(255, 214, 102, 0.45); }
a:hover { text-shadow: 0 0 8px var(--accent-glow); text-decoration-color: var(--accent); }

.back {
  display: inline-block;
  margin-bottom: 32px;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.08em;
}
.back:hover { color: var(--accent); }

/* placeholders that still need to be filled in */
.ph {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 4px;
  border-radius: 3px;
}

.note {
  border: 1px dashed var(--accent);
  color: var(--accent);
  padding: 12px 14px;
  border-radius: 6px;
  margin-bottom: 32px;
}

footer {
  margin-top: 56px;
  color: var(--muted);
  font-size: 13px;
}
footer a { color: var(--muted); text-decoration-color: var(--line); }
footer a:hover { color: var(--accent); }