.header-wrap{
  position:sticky;
  top:0;
  z-index:50;
  padding-top:14px;
}

.header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:14px 18px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.04));
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-radius:18px;
  box-shadow:0 8px 32px rgba(0,0,0,.28);
}

.brand{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-mark{font-size:1.65rem;font-weight:800;line-height:1;letter-spacing:-0.03em;color:#f7fbff}
.brand-sub{font-size:.82rem;color:var(--text-2);letter-spacing:.02em}

.nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.nav a{padding:10px 14px;border-radius:999px;color:var(--text-1);border:1px solid transparent;transition:.2s ease;font-size:.95rem}
.nav a:hover, .nav a.is-active {
  color: #fff;
  background: rgba(79,255,176,.08);
  border-color: rgba(79,255,176,.22);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.05), 0 0 0 1px rgba(79,255,176,.08);
}

.menu-toggle{display:none;width:46px;height:46px;border-radius:14px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.05);color:#ecf7ff;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px;box-shadow:0 8px 20px rgba(0,0,0,.22)}
.menu-toggle span{width:18px;height:2px;border-radius:999px;background:#ecf7ff;display:block}

.mobile-menu{display:none;margin-top:10px;padding:12px;border-radius:18px;border:1px solid var(--line);background:linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.04));backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 8px 32px rgba(0,0,0,.28)}
.mobile-menu.open{display:grid;gap:8px}
.mobile-menu a{display:block;padding:14px 14px;border-radius:14px;color:var(--text-1);background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.05)}
.mobile-menu a:hover, .mobile-menu a.is-active {
  color: #fff;
  border-color: rgba(79,255,176,.22);
  background: rgba(79,255,176,.07);
}

.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:10px 0 18px;color:var(--text-2);font-size:.95rem}
.breadcrumb a{color:var(--text-1)}

.hero{padding:28px;border:1px solid var(--line);border-radius:28px;background:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.04));box-shadow:var(--shadow);margin-bottom:24px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(125,211,252,.10);border:1px solid rgba(125,211,252,.16);color:#d8f1ff;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase}
.hero h1{font-size:clamp(2rem,4vw,3.2rem);line-height:1.04;letter-spacing:-0.04em;margin:16px 0 14px}
.hero p{max-width:860px;margin:0;color:var(--text-1);font-size:1.05rem;line-height:1.7}

.panel{border:1px solid var(--line);border-radius:24px;background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.035));box-shadow:var(--shadow);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}

.content-grid{display:grid;gap:22px;margin-top:24px}
.content-panel{padding:24px}
.content-panel h2{margin:0 0 12px;font-size:1.32rem}
.content-panel p{margin:0;color:var(--text-1);line-height:1.75}
.content-panel ol,.content-panel ul{margin:12px 0 0 20px;color:var(--text-1);line-height:1.75}
.formula-box{margin-top:14px;padding:18px;border-radius:18px;border:1px solid rgba(125,211,252,.16);background:linear-gradient(180deg, rgba(125,211,252,.08), rgba(139,92,246,.06));color:#eef7ff}

.faq-list{display:grid;gap:14px}
details{border:1px solid rgba(255,255,255,.08);border-radius:18px;background:rgba(255,255,255,.03);padding:16px 18px}
summary{cursor:pointer;font-weight:700}
details p{margin:12px 0 0;color:var(--text-1)}

.related-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:14px}
.related-card{display:block;padding:18px;border-radius:18px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.03);transition:.2s ease}
.related-card:hover{transform:translateY(-2px);border-color:rgba(125,211,252,.24);background:rgba(255,255,255,.05)}
.related-card strong{display:block;margin-bottom:6px}
.related-card span{color:var(--text-2);font-size:.95rem;line-height:1.6}

.footer{padding:0 0 28px}
.footer-panel{padding:40px 32px 24px}

/* Top row: brand + 3 cols */
.footer-top{display:flex;gap:48px;align-items:flex-start;margin-bottom:28px}

.footer-brand{display:flex;flex-direction:column;gap:6px;flex-shrink:0;min-width:160px}
.footer-brand-name{font-size:1.1rem;font-weight:800;letter-spacing:-.02em;color:#f7fbff}
.footer-brand-tag{font-size:.8rem;color:var(--text-2);line-height:1.4}

.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(120px,1fr));gap:32px;flex:1}
.footer-col{display:flex;flex-direction:column;gap:9px}
.footer-col-heading{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:rgba(197,212,232,.35);margin-bottom:2px}
.footer-col a{font-size:.88rem;color:var(--text-2);text-decoration:none;transition:color .15s;line-height:1}
.footer-col a:hover{color:#7dd3fc}

.footer-bottom{border-top:1px solid rgba(255,255,255,.07);padding-top:18px;font-size:.82rem;color:var(--text-2)}

@media (max-width:760px){
  .nav{display:none}
  .menu-toggle{display:flex}
  .hero{padding:22px}
  .content-panel{padding:20px}
  .footer-top{flex-direction:column;gap:24px}
  .footer-panel{padding:28px 20px 20px}
}

@media (max-width:520px){
  .footer-cols{grid-template-columns:repeat(2,1fr);gap:20px}
}

@media (max-width:360px){
  .footer-cols{grid-template-columns:1fr}
}
.brand-accent {
  color: var(--accent);
}
/* Finance Calculators nav — màu accent (xanh lá primary) */
.nav a[href="/finance-calculators/"].is-active {
  color: #4fffb0;
  background: rgba(79,255,176,.1);
  border-color: rgba(79,255,176,.3);
  box-shadow: 0 0 12px rgba(79,255,176,.15);
}

/* Health Calculators nav — màu accent-2 (xanh dương secondary) */
.nav a[href="/health-calculators/"].is-active {
  color: #38b2ff;
  background: rgba(56,178,255,.1);
  border-color: rgba(56,178,255,.3);
  box-shadow: 0 0 12px rgba(56,178,255,.15);
}