:root {
  --bg: #0d1116;
  --text: #eef3f7;
  --muted: #b8c5cf;
  --surface: #151d25;
  --line: rgba(255, 255, 255, 0.08);
  --max: 980px;
  --header-bg: #0a0e13;
  --footer-bg: #0f151d;
  --accent-soft: #a8d6ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  font-size: 1.0625rem;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

.page-intro {
  position: relative;
  padding: 28px 0 30px;
  border-top: none;
}

.page-intro::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 100vw;
  margin-left: -50vw;
  border-top: 1px solid var(--line);
  pointer-events: none;
}

.page-intro h1 {
  margin-top: 0;
}

h1 {
  margin: 10px 0 0;
  font-size: clamp(2rem, 4vw, 3.15rem);
  line-height: 1.2;
  letter-spacing: 0.2px;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  line-height: 1.25;
  letter-spacing: 0.2px;
}

.sub {
  color: var(--muted);
  margin: 0;
  max-width: 72ch;
  font-size: 1.12rem;
}

section {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

main section:nth-of-type(even) {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.01), rgba(255, 255, 255, 0));
}

p, ul {
  margin: 0;
  color: var(--muted);
}

ul {
  padding-left: 18px;
}

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