:root {
  --bg:        #131b16;
  --bg-raise:  #1b2420;
  --text:      #e8e9ec;
  --text-dim:  #9a9ca6;
  --accent:    #8ec79a;
  --border:    #262932;
  --max:       1080px;
  --pad:       clamp(1.25rem, 4vw, 3rem);
  --rule:      color-mix(in srgb, var(--accent) 32%, var(--border));
  --sec-gap:   clamp(1.75rem, 4vw, 3.25rem);
  --sec-space: clamp(4rem, 9vh, 7rem);
  --font-body: "Hanken Grotesk", system-ui, sans-serif;
  --font-head: "Hanken Grotesk", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::after {
  content: ""; position: fixed; inset: 0; z-index: 9; pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

h1, h2, h3 { font-family: var(--font-head); line-height: 1.15; font-weight: 700; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }

.topbar {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; padding-top: clamp(1.5rem, 4vh, 2.5rem);
  font-size: 0.9rem; color: var(--text-dim);
}
.topbar a.back { font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em; }
.topbar .who { font-family: var(--font-mono); font-size: 0.8rem; }

.masthead { padding: clamp(2.5rem, 7vh, 4.5rem) 0 clamp(1.5rem, 4vh, 2.5rem); }
.masthead h1 { font-size: clamp(2.4rem, 6vw, 3.9rem); margin: 0 0 0.5rem; letter-spacing: -0.01em; }
.masthead .meta {
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--text-dim); text-transform: uppercase; margin: 0 0 1.5rem;
}
.masthead .lede { color: var(--text); max-width: 46rem; margin: 0 0 1rem; }
.masthead .steam-link {
  display: inline-block; margin-top: 0.9rem;
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent);
}

.hero { margin: clamp(1.5rem, 4vh, 2.5rem) 0 0; }
.hero img { width: 100%; height: auto; display: block; border-radius: 12px; border: 1px solid var(--border); }

/* ---- the spine ---- */

.doc { padding: clamp(3rem, 8vh, 5.5rem) 0 clamp(4rem, 10vh, 7rem); }

.spine { position: relative; }
.spine::before {
  content: ""; position: absolute; left: 50%; top: 0;
  bottom: calc(var(--sec-space) * 0.5);
  width: 1px; background: var(--rule); transform: translateX(-50%);
}

.part {
  position: relative; text-align: center;
  margin: 0 0 var(--sec-space);
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-dim);
}
.part span {
  background: var(--bg); padding: 0 1.1rem; position: relative; z-index: 1;
}
.part:not(:first-child) { margin-top: calc(var(--sec-space) * 0.35); }

.sec { position: relative; width: calc(50% - var(--sec-gap)); margin-bottom: var(--sec-space); }
.sec--l { margin-right: auto; }
.sec--r { margin-left: auto; }

.sec > .node { position: absolute; display: block; width: 1.4rem; height: 1.4rem; top: 0.3rem; z-index: 2; }
.sec--l > .node { right: calc(-1 * var(--sec-gap)); transform: translateX(50%); }
.sec--r > .node { left: calc(-1 * var(--sec-gap)); transform: translateX(-50%); }
.sec > .node::before {
  content: ""; position: absolute; inset: 0; margin: auto;
  width: 0.6rem; height: 0.6rem; box-sizing: border-box;
  border: 2px solid var(--accent); border-radius: 50%; background: var(--accent);
}

.sec h2 { font-size: 1.45rem; margin: 0 0 0.75rem; }
.sec h3 { font-size: 1.05rem; margin: 1.6rem 0 0.5rem; color: var(--text); }
.sec p { margin: 0 0 0.9rem; color: var(--text-dim); }
.sec p:last-child { margin-bottom: 0; }
.sec strong { color: var(--text); font-weight: 600; }
.sec ul { margin: 0 0 0.9rem; padding-left: 1.1rem; color: var(--text-dim); }
.sec li { margin-bottom: 0.35rem; }

.video-embed {
  aspect-ratio: 16 / 9; border-radius: 10px; overflow: hidden;
  border: 1px solid var(--border); background: var(--bg-raise);
}
.video-embed iframe { width: 100%; height: 100%; display: block; border: 0; }

figure { margin: 1.4rem 0 2rem; }
figure:last-child { margin-bottom: 0; }
figure img { width: 100%; height: auto; display: block; border-radius: 10px; border: 1px solid var(--border); }
figcaption {
  margin-top: 0.6rem; font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.03em; color: var(--text-dim); line-height: 1.5;
}

.outro {
  position: relative; max-width: 46rem; margin: 0 auto;
  padding-top: clamp(2rem, 5vh, 3rem); text-align: left;
}
.outro p { color: var(--text-dim); }
.outro .sign {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text);
  margin-top: 1.5rem;
}

.ach {
  position: relative; max-width: 46rem; margin: clamp(2.5rem, 6vh, 4rem) auto 0;
}
.ach h3 {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-dim); font-weight: 400;
  margin: 0 0 1.1rem;
}
.ach-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(54px, 1fr));
  gap: 0.55rem;
}
.ach-grid img {
  width: 100%; height: auto; display: block;
  border-radius: 6px; border: 1px solid var(--border);
}

.footer {
  border-top: 1px solid var(--border);
  padding: clamp(2rem, 5vh, 3rem) 0 clamp(3rem, 7vh, 4.5rem);
  display: flex; gap: 1.5rem; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim);
}
.footer a:hover { color: var(--accent); }

@media (max-width: 860px) {
  .doc::before { display: none; }
  .sec { width: 100%; margin-bottom: calc(var(--sec-space) * 0.7); }
  .sec > .node { display: none; }
  .part span { padding: 0; }
}