:root {
  --void: #05080c;
  --hull: #10181e;
  --ln2: #5ee0d0;
  --frostline: #9ae8dc;
  --seed: #c4894a;
  --amber: #f0a020;
  --paper: #e7ddd0;
  --ink: #d7ece8;
  --mute: #7a9a96;
  --display: "Big Shoulders Display", "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: 72px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--void);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--ln2); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
label { display: block; font-size: 13px; color: var(--mute); }
input[type="range"] { width: min(280px, 100%); accent-color: var(--ln2); }
.frost {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 7;
  opacity: 0.12;
  background-image: url("images/texture.webp");
  background-size: 380px auto;
  mix-blend-mode: screen;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--ln2); color: var(--void); padding: 8px; }
.bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 24px;
  background: rgba(5, 8, 12, 0.92);
  border-bottom: 1px solid rgba(94, 224, 208, 0.2);
}
.brand { font-family: var(--display); font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mute);
  font-weight: 400;
  text-transform: none;
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--ln2);
  color: var(--ln2);
  padding: 6px 12px;
}
.nav-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; }
.nav-links a { color: var(--mute); }
.nav-links a.is-active, .nav-links a:hover { color: var(--ln2); }
.nav-links .live { background: var(--ln2); color: var(--void); padding: 6px 12px; }
.hero { padding: 28px 24px 48px; }
.ports {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.9fr;
  gap: 18px;
  align-items: center;
  margin-bottom: 36px;
}
.port {
  margin: 0;
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  border: 10px solid #1a2a2e;
  box-shadow: 0 0 0 1px rgba(94, 224, 208, 0.35), 0 24px 40px rgba(0, 0, 0, 0.45);
}
.port img { width: 100%; height: 100%; object-fit: cover; }
.copy { max-width: 820px; }
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: var(--ln2);
  margin: 0 0 12px;
}
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 0.95; font-weight: 800; letter-spacing: 0.02em; }
h1 { font-size: clamp(44px, 7vw, 84px); text-transform: uppercase; }
h2 { font-size: clamp(26px, 3.4vw, 42px); }
.lead { max-width: 46em; color: var(--mute); }
.dewar {
  display: flex;
  gap: 18px;
  align-items: center;
  margin: 22px 0;
  padding: 16px 18px;
  background: var(--hull);
  border: 1px solid rgba(94, 224, 208, 0.25);
  max-width: 440px;
}
.dewar.is-ok { border-color: var(--ln2); }
.gauge {
  position: relative;
  width: 52px;
  height: 160px;
  border-radius: 26px 26px 8px 8px;
  border: 2px solid var(--ln2);
  background: #071014;
  overflow: hidden;
  flex-shrink: 0;
}
.gauge-fill {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 52%;
  background: linear-gradient(180deg, var(--frostline), #1a8f86);
  transition: height 0.15s linear, background 0.15s;
}
.dewar.is-alert .gauge-fill { background: linear-gradient(180deg, var(--amber), #a85a10); }
.dewar.is-alert { border-color: var(--amber); }
.n { font-family: var(--display); font-size: 48px; margin: 0 0 4px; line-height: 1; }
.n span { font-size: 18px; color: var(--mute); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; padding: 10px 16px; border: 1px solid currentColor; font-size: 14px; }
.btn.fill { background: var(--ln2); color: var(--void); border-color: var(--ln2); }
.btn.line { color: var(--ink); }
.w { width: min(1040px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
#need, #tank, #rules { background: var(--paper); color: #1c1814; }
#need .kicker, #tank .kicker, #rules .kicker { color: #8a5a28; }
#need .app-link, #tank .app-link, #rules .app-link { color: #8a5a28; }
.alt { background: var(--hull); }
.tri { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 20px; }
.tri article { background: rgba(255, 255, 255, 0.04); padding: 16px; }
#need .tri article { background: #fff; }
.tri ul, .io ul, #rules ol { margin: 0; padding-left: 1.1em; }
.steps { padding-left: 1.2em; max-width: 48em; }
.steps li { margin-bottom: 10px; }
#rules ol {
  background: #fff;
  padding: 16px 16px 16px 36px;
  border-left: 8px solid var(--seed);
  max-width: 46em;
}
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #0c1418; padding: 16px; }
.url { margin-top: 18px; font-family: var(--mono); font-size: 13px; }
footer { padding: 20px 24px 40px; color: var(--mute); font-size: 13px; }
@media (max-width: 900px) {
  .ports { grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
  .port { border-width: 6px; }
  .tri, .io { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .bar { flex-wrap: wrap; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: #0c1418;
    padding: 12px;
  }
  .nav-links.open { display: flex; }
  h1 { font-size: 42px; }
}