/* =========================================================
   VTI Unified Reference Stylesheet
   Canonical • Neutral • Non-Commercial • Foundation Safe
   ========================================================= */

:root {
  --bg: #0e0f11;
  --fg: #e6e6e6;
  --muted: #9aa0a6;
  --line: #2a2d33;
  --accent: #b0b3b8;

  --maxw: 920px;
  --pad: 24px;
}

/* ---------- Base ---------- */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Inter, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

/* ---------- Watermark ---------- */

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("/assets/img/swirl.png");
  background-repeat: no-repeat;
  background-position: center 40%;
  background-size: 420px;
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
}

/* ---------- Layout ---------- */

header, main, footer {
  position: relative;
  z-index: 1;
}

a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

a:hover {
  border-bottom-color: var(--accent);
}

/* ---------- Header ---------- */

header {
  border-bottom: 1px solid var(--line);
}

header .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header .brand {
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

nav a {
  margin-left: 22px;
  font-size: 0.9rem;
  color: var(--muted);
}

nav a.active {
  color: var(--fg);
  border-bottom-color: var(--accent);
}

/* ---------- Content ---------- */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px var(--pad);
}

h1 {
  font-size: 2.2rem;
  font-weight: 500;
  margin-bottom: 1.4rem;
}

h2 {
  font-size: 1.15rem;
  font-weight: 500;
  margin-top: 3rem;
  margin-bottom: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

p {
  max-width: 780px;
  margin-bottom: 1.2rem;
}

ul {
  margin-left: 1.2rem;
}

li {
  margin-bottom: 0.55rem;
}

/* ---------- Legal / Disclaimers ---------- */

.disclaimer {
  margin-top: 2.25rem;
  padding-top: .75rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Footer ---------- */

footer {
  border-top: 1px solid var(--line);
  margin-top: 32px;
}

footer .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px var(--pad);
  font-size: 0.8rem;
  color: var(--muted);
}

footer .wrap span {
  display: block;
  margin-top: 6px;
}