:root {
  --bb-navy: #071a35;
  --bb-blue: #086ad8;
  --bb-cyan: #25c7d9;
  --bb-ink: #12233f;
  --bb-muted: #5d6b80;
  --bb-line: #d9e6f3;
  --bb-soft: #eef7ff;
  --bb-white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--bb-ink);
  background: #f7fbff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

a { color: var(--bb-blue); }
a:hover { color: #064f9f; }

.blog-nav {
  background: var(--bb-navy);
  border-bottom: 1px solid rgba(255,255,255,.12);
}

.blog-nav__inner,
.article-shell,
.article-hero__inner {
  width: min(1120px, calc(100% - 32px));
  margin-inline: auto;
}

.blog-nav__inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.blog-logo {
  color: #fff;
  text-decoration: none;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: .02em;
}

.blog-nav__link {
  color: #dcecff;
  text-decoration: none;
  font-weight: 700;
}

.article-hero {
  color: #fff;
  background:
    radial-gradient(circle at 85% 15%, rgba(37,199,217,.35), transparent 28%),
    linear-gradient(135deg, #071a35 0%, #0b376d 60%, #075d9e 100%);
  padding: 72px 0 82px;
}

.article-hero__inner { max-width: 920px; }

.article-kicker {
  margin: 0 0 12px;
  color: #83e9f3;
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.article-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.article-intro {
  max-width: 760px;
  margin: 22px 0 0;
  color: #e6f2ff;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.article-meta {
  margin: 22px 0 0;
  color: #bcd1e8;
  font-size: .92rem;
}

.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 760px) minmax(220px, 1fr);
  gap: 48px;
  align-items: start;
  padding: 56px 0 80px;
}

.article-card,
.article-aside,
.article-cta {
  border: 1px solid var(--bb-line);
  border-radius: 20px;
  background: var(--bb-white);
  box-shadow: 0 14px 42px rgba(17,54,92,.08);
}

.article-card { padding: clamp(24px, 5vw, 52px); }

.article-card h2 {
  margin: 2.2rem 0 .65rem;
  color: #0a2b54;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.25;
}

.article-card h2:first-child { margin-top: 0; }
.article-card h3 { margin: 1.5rem 0 .4rem; line-height: 1.3; }
.article-card p { margin: 0 0 1.1rem; }
.article-card ul,
.article-card ol { padding-left: 1.25rem; }
.article-card li { margin-bottom: .55rem; }

.tip-number {
  display: inline-grid;
  width: 36px;
  height: 36px;
  margin-right: 8px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--bb-blue);
  font-size: .9rem;
  vertical-align: .12em;
}

.article-note {
  margin: 1.6rem 0;
  padding: 18px 20px;
  border-left: 4px solid var(--bb-cyan);
  border-radius: 0 12px 12px 0;
  background: var(--bb-soft);
}

.article-aside {
  position: sticky;
  top: 24px;
  padding: 24px;
}

.article-aside h2 { margin: 0 0 12px; font-size: 1.15rem; }
.article-aside ol { margin: 0; padding-left: 1.2rem; }
.article-aside li { margin-bottom: .7rem; }

.article-cta {
  margin-top: 40px;
  padding: 28px;
  color: #fff;
  background: linear-gradient(135deg, #08386f, #086ad8);
}

.article-cta h2 { margin: 0 0 8px; color: #fff; }
.article-cta p { color: #e6f2ff; }

.bb-button {
  display: inline-block;
  margin-top: 8px;
  padding: 12px 18px;
  border-radius: 9px;
  color: #06213f;
  background: #fff;
  text-decoration: none;
  font-weight: 800;
}

.article-footer {
  padding: 30px 16px;
  color: #bcd1e8;
  background: var(--bb-navy);
  text-align: center;
}

.article-footer a { color: #fff; }

@media (max-width: 820px) {
  .article-shell { grid-template-columns: 1fr; }
  .article-aside { position: static; order: -1; }
  .article-hero { padding: 54px 0 62px; }
}

@media (max-width: 520px) {
  .blog-nav__inner { min-height: 64px; }
  .blog-nav__link { font-size: .9rem; }
  .article-shell { width: min(100% - 20px, 1120px); padding-top: 28px; gap: 22px; }
  .article-card { padding: 24px 20px; border-radius: 16px; }
}