* {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
  --bg: #04101f;
  --panel: rgba(7, 19, 39, 0.82);
  --line: rgba(148, 163, 184, 0.2);
  --text: #e5eefb;
  --muted: rgba(226, 232, 240, 0.78);
  --accent: #64d7ff;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(91, 173, 255, 0.18), transparent 26%),
    radial-gradient(circle at top right, rgba(141, 92, 255, 0.16), transparent 24%),
    linear-gradient(180deg, #030c18, #061120 44%, #07192e);
}

a {
  color: var(--accent);
}

.shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: rgba(6, 17, 33, 0.62);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand img {
  height: 2.5rem;
  width: auto;
}

.nav {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.7rem;
  padding: 0 1rem;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 999px;
  background: rgba(12, 27, 53, 0.72);
  color: var(--text);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero,
.article {
  border: 1px solid var(--line);
  border-radius: 1.6rem;
  background: var(--panel);
  box-shadow:
    0 22px 70px rgba(0, 0, 0, 0.26),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.hero,
.article {
  padding: 2rem;
}

.kicker {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.article h1 {
  margin: 0;
  line-height: 1.05;
  font-size: clamp(2rem, 4vw, 3.6rem);
}

.hero p,
.meta p,
.article p,
.article li {
  color: var(--muted);
  line-height: 1.85;
  font-size: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 1.3rem;
  background: rgba(8, 22, 46, 0.78);
}

.card h2,
.article h2 {
  margin: 0.3rem 0 0;
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 1.15;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.related-card {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(8, 22, 46, 0.74);
}

.related-card h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.35;
}

.related-card p {
  margin: 0.6rem 0 0;
  font-size: 0.94rem;
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1.4rem 0 1.8rem;
}

.meta-block,
.toc {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(9, 24, 47, 0.8);
}

.meta-label {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-note {
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: rgba(226, 232, 240, 0.62);
  font-size: 0.92rem;
}

@media (max-width: 900px) {
  .grid,
  .meta,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}