:root {
  --duel-dark: #15202b;
  --duel-accent: #e46f2e;
  --surface: #f6f8fa;
  --border: #e2e7ec;
  --success-bg: #edf8f1;
  --success-border: #b9dfc7;
}

html { scroll-behavior: smooth; }
body {
  color: #25313c;
  background: #fff;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}
.content-width { max-width: 1040px; }
.topbar { border-bottom: 1px solid var(--border); background: #fff; }
.brand { font-size: 1.55rem; font-weight: 800; letter-spacing: -.04em; }
.brand-duel { color: var(--duel-dark); }
.brand-host { color: var(--duel-accent); }
.hero {
  background: linear-gradient(135deg, #f7f9fb 0%, #fff 65%);
  border-bottom: 1px solid var(--border);
}
.py-lg-6 { padding-top: 5rem !important; padding-bottom: 5rem !important; }
.eyebrow {
  color: var(--duel-accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .8rem;
}
.status-card {
  background: var(--duel-dark);
  color: #fff;
  border-radius: 1rem;
  box-shadow: 0 1rem 2.5rem rgba(21,32,43,.14);
}
.status-icon {
  width: 3rem; height: 3rem; display: grid; place-items: center;
  border-radius: 50%; background: #fff; color: #198754;
  font-size: 1.5rem; font-weight: 800;
}
.notice {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-left: 5px solid #198754;
  border-radius: .75rem;
}
.section-block {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border);
}
.section-block:last-child { border-bottom: 0; }
.section-block > h2 {
  color: var(--duel-dark);
  font-weight: 750;
  margin-bottom: 1.5rem;
}
.migration-date, .info-card, .feature, .action-card {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: .75rem;
}
.migration-date { border-left: 5px solid var(--duel-accent); background: var(--surface); }
.feature { padding: .85rem 1rem; height: 100%; font-weight: 600; }
.action-card { display: flex; gap: 1.25rem; }
.number {
  flex: 0 0 2.5rem; width: 2.5rem; height: 2.5rem;
  display: grid; place-items: center; border-radius: 50%;
  background: var(--duel-dark); color: #fff; font-weight: 800;
}
code { color: #b94f18; font-size: .95rem; }
.link-card {
  border: 1px solid var(--border);
  border-radius: .75rem;
  color: var(--duel-dark);
  transition: transform .15s ease, box-shadow .15s ease;
}
.link-card:hover { transform: translateY(-2px); box-shadow: 0 .5rem 1.5rem rgba(0,0,0,.07); }
.link-card strong, .link-card span { display: block; }
.link-card strong { font-size: 1.1rem; margin-bottom: .35rem; }
.link-card span { color: #5c6975; }
.contact-box { background: var(--surface); border-radius: .9rem; }
.summary {
  background: var(--duel-dark);
  color: #fff;
  border-radius: 1rem;
}
.summary h2 { color: #fff; }
.summary li { margin-bottom: .35rem; }
.footer { background: #f5f7f9; border-top: 1px solid var(--border); }
.footer a { color: var(--duel-dark); }

@media (max-width: 767.98px) {
  .hero h1 { font-size: 2.35rem; }
  .section-block { padding: 2.5rem 0; }
  .action-card { flex-direction: column; }
  .py-lg-6 { padding-top: 3rem !important; padding-bottom: 3rem !important; }
}