:root {
  --soot: #12100e;
  --rust: #b85c38;
  --leak: #ff6a1a;
  --block: #3ec8c8;
  --ok: #8fdb7a;
  --steam: #e8ece8;
  --mute: #b7b1a8;
  --display: "Syne", "Noto Sans SC", sans-serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 70px; }

body {
  margin: 0;
  color: var(--steam);
  background: var(--soot);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--leak); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: #2a2018; padding: 0.05em 0.35em; }

.scale {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 7;
  opacity: 0.16;
  background-image: url("images/texture.webp");
  background-size: 380px auto;
  mix-blend-mode: overlay;
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; z-index: 80; background: var(--leak); color: #000; padding: 8px; }

.pipe-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 18px;
  min-height: 62px;
  background: #1a1410;
  border-bottom: 2px solid var(--rust);
}
.brand { font-family: var(--display); font-size: 22px; letter-spacing: -0.02em; }
.brand small { display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: var(--rust); }
.pipe-links { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 14px; }
.pipe-links a.is-active { color: var(--leak); }
.pipe-links .live { background: var(--leak); color: #1a0c04; padding: 6px 12px; font-weight: 700; }
.nav-toggle { display: none; background: transparent; color: var(--steam); border: 1px solid var(--rust); padding: 6px 12px; }

.hero { position: relative; min-height: 86vh; }
.hero img { width: 100%; height: 86vh; object-fit: cover; }
.mist {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 48px 8vw 36px;
  background: linear-gradient(transparent, #12100e 70%);
}
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; color: var(--leak); margin: 0 0 8px; }
h1, h2, h3 { font-family: var(--display); line-height: 1.05; margin: 0 0 12px; }
h1 { font-size: clamp(40px, 7vw, 72px); max-width: 16ch; }
h1 em { font-style: normal; color: var(--leak); }
h2 { font-size: clamp(26px, 4vw, 42px); color: var(--steam); }
.lead { max-width: 68ch; }
.quiet { color: var(--mute); }

.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.btn { display: inline-block; padding: 10px 16px; border: 1px solid var(--leak); font-weight: 700; }
.btn.fill { background: var(--leak); color: #1a0c04; }
.btn.ghost { background: transparent; color: var(--steam); }

.wrap { width: min(1100px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
.soot { background: #181410; }
.three, .four, .io { display: grid; gap: 16px; }
.three { grid-template-columns: repeat(3, 1fr); }
.four { grid-template-columns: repeat(4, 1fr); }
.three article, .four article, .io > div { background: #1e1914; border: 1px solid #3a2c24; padding: 18px; }
.three .hot { border-color: var(--leak); }
ul { margin: 0; padding-left: 1.1em; }
li + li { margin-top: 6px; }

.nodes {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0 0 36px;
}
.nodes li {
  padding: 12px 8px;
  border-top: 3px solid var(--block);
  background: #1e1914;
  font-size: 14px;
}

.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; margin-bottom: 40px; }
.pair.flip figure { order: -1; }
.num { font-family: var(--mono); color: var(--block); font-size: 12px; letter-spacing: 0.14em; }
figure { margin: 0; }
figcaption { color: var(--mute); font-size: 13px; margin-top: 8px; }

.net-board {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 20px;
  background: #1a1512;
  border: 1px solid #3a2c24;
  padding: 20px;
}
.valves { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.valve {
  text-align: left;
  background: #12100e;
  color: var(--steam);
  border: 1px solid #3a2c24;
  padding: 14px;
}
.valve.on { outline: 1px dashed var(--leak); }
.valve.leak { box-shadow: inset 4px 0 0 var(--leak); }
.valve.blocked { box-shadow: inset 4px 0 0 var(--block); }
.valve.ok { box-shadow: inset 4px 0 0 var(--ok); }
.valve.unknown { box-shadow: inset 4px 0 0 #888; }
.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  animation: blink 1.6s ease-in-out infinite;
}
.valve.leak .dot { background: var(--leak); animation-duration: 0.5s; }
.valve.ok .dot { background: var(--ok); }
.valve.blocked .dot { background: var(--block); animation: none; opacity: 0.45; }
.valve.unknown .dot { background: #888; animation: none; }
@keyframes blink { 50% { opacity: 0.25; } }

.bound { padding-left: 1.2em; }
.io { grid-template-columns: 1fr 1fr; }
footer { padding: 24px 20px 40px; border-top: 2px solid var(--rust); color: var(--mute); font-size: 14px; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .pipe-links {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    background: #1a1410;
    padding: 12px 18px 18px;
    flex-direction: column;
    align-items: flex-start;
  }
  .pipe-links.open { display: flex; }
  .hero img { height: 64vh; }
  .three, .four, .pair, .pair.flip, .net-board, .io, .nodes { grid-template-columns: 1fr; }
  .pair.flip figure { order: 0; }
}