:root {
  --purple-top: #7c5cff;
  --purple: #4b2fc9;
  --purple-deep: #2a107a;
  --ink: #f7f2ff;
  --muted: rgba(247, 242, 255, 0.68);
  --paper: #fbf7ff;
  --paper-ink: #1c1030;
  --paper-muted: #5b4d72;
  --teal: #1fd8a4;
  --line: rgba(75, 47, 201, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Nunito", system-ui, sans-serif;
  background: var(--purple-deep);
}

.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(118deg, rgba(124, 92, 255, 0.55), transparent 42%),
    linear-gradient(200deg, #4b2fc9 0%, #2a107a 58%, #1a0848 100%);
}
.facet {
  position: absolute;
  background: #5b21b6;
  opacity: 0.42;
  pointer-events: none;
}
.facet-a {
  width: 70vw;
  height: 140vh;
  top: -30vh;
  left: -12vw;
  transform: rotate(18deg);
  background: #4a1594;
}
.facet-b {
  width: 55vw;
  height: 120vh;
  top: 8vh;
  right: -18vw;
  transform: rotate(-14deg);
  opacity: 0.5;
}

.wrap {
  width: min(820px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 80px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}
.brand svg { display: block; }
.links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.links a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 8px 12px;
  border-radius: 999px;
}
.links a:hover { background: rgba(255, 255, 255, 0.1); }
.links a.current { background: #f4f0e6; color: #1c1030; }

.hero {
  margin: 8px 0 28px;
}
.kicker {
  margin: 0 0 10px;
  color: var(--teal);
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}
.hero p {
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.55;
}

.paper {
  background: var(--paper);
  color: var(--paper-ink);
  border-radius: 28px;
  padding: clamp(28px, 5vw, 52px);
  box-shadow: 0 24px 60px rgba(16, 4, 48, 0.35);
}
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0 0 28px;
  color: var(--paper-muted);
  font-size: 0.92rem;
  font-weight: 700;
}
.paper h2 {
  margin: 1.6em 0 0.45em;
  font-size: 1.28rem;
  letter-spacing: -0.03em;
}
.paper h2:first-of-type { margin-top: 0.2em; }
.paper p, .paper li {
  color: #2a2040;
  line-height: 1.7;
  font-size: 1.02rem;
}
.paper ul { padding-left: 1.15em; }
.paper a { color: #4b2fc9; font-weight: 800; }
.toc {
  display: grid;
  gap: 8px;
  margin: 0 0 8px;
  padding: 0;
  list-style: none;
}
.toc a {
  display: block;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(75, 47, 201, 0.06);
  text-decoration: none;
}

.cards {
  display: grid;
  gap: 16px;
}
@media (min-width: 720px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 180px;
  padding: 24px;
  border-radius: 22px;
  background: var(--paper);
  color: var(--paper-ink);
  text-decoration: none;
  box-shadow: 0 18px 40px rgba(16, 4, 48, 0.28);
}
.card h2 {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: -0.03em;
}
.card p {
  margin: 0;
  color: var(--paper-muted);
  line-height: 1.5;
  flex: 1;
}
.card span {
  font-weight: 800;
  color: var(--purple);
}

.foot {
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.92rem;
}
.foot a { color: var(--teal); font-weight: 800; }

@media (max-width: 640px) {
  .nav { align-items: flex-start; flex-direction: column; }
}