:root {
  --bg: #0B1620;
  --bg-raised: #101F2B;
  --rule: #1E3141;
  --ink: #DCE6EC;
  --ink-soft: #94A8B6;
  --accent: #35A0A8;
  --accent-dim: #1E6E75;
}

* { box-sizing: border-box; }

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 1.05rem;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover { color: var(--ink); }

header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.bar {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0.95rem 1.4rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
}

.mark {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
}

.mark span { color: var(--accent); font-weight: 700; }

.mark:hover { color: var(--ink); }

nav {
  display: flex;
  gap: 1.15rem;
  font-size: 0.92rem;
}

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

nav a:hover,
nav a.here {
  color: var(--ink);
}

nav a.here {
  border-bottom: 1px solid var(--accent);
  padding-bottom: 0.1rem;
}

.wrap {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.4rem 3.5rem;
}

.hero {
  padding: 3.2rem 0 1.4rem;
}

h1, h2, h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink);
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.55rem);
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 0.85rem;
}

h3 {
  font-size: 1.08rem;
  margin: 0 0 0.4rem;
}

.lead {
  font-size: 1.12rem;
  color: var(--ink-soft);
  max-width: 42rem;
  margin: 0 0 1.6rem;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 0.65rem 1.15rem;
  border-radius: 2px;
}

.cta:hover {
  color: var(--bg);
  background: var(--accent-dim);
}

section {
  padding: 1.5rem 0 0.4rem;
  border-top: 1px solid var(--rule);
  margin-top: 1.6rem;
}

section p { margin: 0 0 1rem; }

ul.plain {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

ul.plain li {
  margin: 0 0 0.85rem;
  padding-left: 0;
}

ul.plain b { color: var(--ink); }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem 2rem;
  margin: 0 0 1.2rem;
}

.pair p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.note {
  background: var(--bg-raised);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.15rem;
  margin: 0 0 1rem;
}

.note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

dl.detail {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.45rem 1rem;
  margin: 0 0 1.4rem;
}

dl.detail dt {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.92rem;
}

dl.detail dd {
  margin: 0;
}

footer {
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

footer .wrap {
  padding-top: 1.4rem;
  padding-bottom: 2rem;
}

footer p { margin: 0 0 0.35rem; }

@media (max-width: 720px) {
  .bar { flex-wrap: wrap; gap: 0.6rem 1rem; }
  .pair { grid-template-columns: 1fr; }
  dl.detail { grid-template-columns: 1fr; gap: 0.15rem; }
  dl.detail dt { margin-top: 0.55rem; }
  .hero { padding-top: 2.2rem; }
}