:root{
  --bg:#f5f7fb;
  --card:#ffffff;
  --text:#0b1220;
  --muted:#5b6475;
  --line:#e7ebf3;
  --primary:#0b57d0;
  --radius:18px;
  --shadow:0 10px 30px rgba(15, 23, 42, .08);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
}

a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:1100px;margin:0 auto;padding:0 18px}

.topbar{
  background:rgba(255,255,255,.92);
  border-bottom:1px solid var(--line);
  position:sticky; top:0; z-index:10;
  backdrop-filter: blur(10px);
}
.topbar .wrap{
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 18px;
}
.brand{font-weight:800; letter-spacing:.2px}

.nav{display:flex; gap:10px; flex-wrap:wrap; justify-content:flex-end}
.nav a{
  padding:8px 12px;
  border-radius:999px;
  color:var(--text);
  border:1px solid transparent;
}
.nav a.active, .nav a:hover{
  background:#eef4ff;
  border-color:#d7e4ff;
  text-decoration:none;
}

.hero{
  padding:38px 0;
  background:
    radial-gradient(900px 500px at 20% 20%, rgba(11,87,208,.12), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(11,87,208,.10), transparent 60%);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.3fr .9fr;
  gap:18px;
  align-items:start;
}

.page-hero{
  padding:30px 0 12px;
  background:
    radial-gradient(900px 500px at 20% 20%, rgba(11,87,208,.10), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(11,87,208,.08), transparent 60%);
  border-bottom:1px solid var(--line);
}

h1{font-size:42px; line-height:1.15; margin:10px 0 8px}
h2{font-size:22px; margin:0 0 10px}
.sub{color:var(--muted); margin:0 0 14px}
.muted{color:var(--muted)}

.pill{
  display:inline-block;
  padding:8px 12px;
  border-radius:999px;
  background:#eaf2ff;
  border:1px solid #d7e4ff;
  font-weight:600;
  font-size:13px;
}

.section{padding:22px 0}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
  margin:0 0 14px;
}

.list, .bullets{
  margin:10px 0 0;
  padding-left:18px;
}
.list li, .bullets li{margin:6px 0}

.meta{margin-top:14px; padding-top:12px; border-top:1px solid var(--line); color:var(--muted)}

.notice{
  background:#fff7ed;
  border:1px solid #fed7aa;
  color:#7c2d12;
  padding:12px 14px;
  border-radius:14px;
  margin:0 0 14px;
}

.cta-row{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:14px;
}
.cta-row.second{margin-top:10px}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 16px;
  border-radius:14px;
  font-weight:700;
  border:1px solid transparent;
  cursor:pointer;
  text-decoration:none !important;
}
.btn-primary{
  background:var(--primary);
  color:white;
  border-color:var(--primary);
}
.btn-primary:hover{filter:brightness(.95)}
.btn-outline{
  background:transparent;
  color:var(--primary);
  border-color:#cfe0ff;
}
.btn-outline:hover{background:#eef4ff}

.full{width:100%}

.grid-2{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}
.grid-3{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
}

.footer{
  padding:18px 0;
  border-top:1px solid var(--line);
  color:var(--muted);
}

@media (max-width: 900px){
  h1{font-size:34px}
  .hero-grid{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
}

.footer a{color:var(--muted);text-decoration:underline;}
.footer a:hover{color:var(--primary);}


/* CTA alignment improvements */
.cta-primary{justify-content:flex-start}
.cta-primary .btn{min-width:220px}
@media (max-width: 900px){
  .cta-primary{flex-direction:column}
  .cta-primary .btn{width:100%}
}


/* ===== Desktop CTA: mỗi nút 1 dòng, chữ to hơn ===== */
@media (min-width: 901px) {
  .cta-primary {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
  .cta-primary .btn {
    font-size: 18px;
    padding: 16px 28px;
    min-width: 320px;
  }
}


/* --- Mobile nav: 1 hàng (cuộn ngang) để không bị xuống dòng lộn xộn --- */
@media (max-width: 900px){
  .nav{
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space: nowrap}
}

/* --- iOS small screens: giảm nhẹ CTA để gọn hơn --- */
@media (max-width: 420px){
  .cta-primary .btn{padding:13px 14px; font-size:15px}
}


/* SEO content helpers */
.lead{font-size:18px;color:var(--muted);margin:0 0 16px}
.btn.secondary{background:#eaf2ff;border:1px solid #d7e4ff;color:var(--primary)}
.article h2{margin-top:26px}
.article h3{margin-top:18px}
.table{width:100%;border-collapse:collapse;margin:12px 0 6px}
.table th,.table td{border:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}
.table th{background:#f3f6ff}
@media (max-width: 900px){
  .grid-3{grid-template-columns:1fr}
}