:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --text: #151a22;
  --muted: #5f6878;
  --border: #e2e5ea;
  --accent: #2456d6;
  --accent-dark: #1d46c2;
  --good: #167a3e;
  --radius: 14px;
  --max: 1080px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 'Be Vietnam Pro', system-ui, -apple-system, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { margin: 0 0 12px; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 5vw, 46px); }
h2 { font-size: clamp(23px, 3.2vw, 31px); }
h3 { font-size: 18px; }
p { margin: 0 0 14px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }

/* Header */
header { position: sticky; top: 0; z-index: 10; background: rgba(255, 255, 255, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
/* padding-block để không xóa mất lề ngang 20px mà .wrap đã đặt */
.nav { display: flex; align-items: center; gap: 18px; padding-block: 14px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); }
.logo:hover { text-decoration: none; }
.logo .mark { width: 34px; height: 34px; display: block; }
.logo small { display: block; font-size: 11.5px; font-weight: 500; color: var(--muted); }
.nav .links { margin-left: auto; display: flex; gap: 20px; align-items: center; font-size: 14.5px; }
.nav .links a { color: var(--muted); font-weight: 500; }
.nav .links a:hover { color: var(--text); text-decoration: none; }
.btn { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: #fff; border: 1px solid var(--accent); border-radius: 10px; padding: 11px 20px; font-weight: 600; font-size: 15px; }
.btn:hover { background: var(--accent-dark); text-decoration: none; }
.btn.ghost { background: #fff; color: var(--text); border-color: var(--border); }
.btn.ghost:hover { background: var(--bg-soft); }
@media (max-width: 720px) { .nav .links a:not(.btn) { display: none; } }
/* Màn hình hẹp: bỏ dòng phụ dưới logo và thu nhỏ nút để không tràn ra ngoài */
@media (max-width: 480px) {
  .logo small { display: none; }
  .nav { gap: 10px; }
  .logo { min-width: 0; }
  .logo div { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .nav .links { flex-shrink: 0; }
  .btn { padding: 9px 14px; font-size: 14px; }
}

/* Hero */
.hero { padding: 64px 0 52px; background: linear-gradient(180deg, #eef3ff 0%, #fff 70%); }
.hero .eyebrow { display: inline-block; background: #e3ebff; color: var(--accent); font-size: 13px; font-weight: 600; padding: 5px 12px; border-radius: 99px; margin-bottom: 16px; }
.hero p.lead { font-size: 18px; color: var(--muted); max-width: 640px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.hero .note { margin-top: 14px; font-size: 13.5px; color: var(--muted); }

/* Sections */
section { padding: 56px 0; }
section.alt { background: var(--bg-soft); }
.section-head { max-width: 680px; margin-bottom: 30px; }
.section-head p { color: var(--muted); margin: 0; }
.grid { display: grid; gap: 18px; }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px) { .g3, .g2 { grid-template-columns: 1fr; } }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card .ico { width: 38px; height: 38px; border-radius: 10px; background: #e8efff; color: var(--accent); display: grid; place-items: center; margin-bottom: 12px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.steps { counter-reset: s; display: grid; gap: 16px; }
.step { display: flex; gap: 16px; align-items: flex-start; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.step b.num { flex-shrink: 0; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; font-size: 14px; }
.step p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }
table.metrics { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; font-size: 15px; }
table.metrics th, table.metrics td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); }
table.metrics th { background: var(--bg-soft); font-size: 13.5px; color: var(--muted); font-weight: 600; }
table.metrics tr:last-child td { border-bottom: 0; }

/* Contact / footer */
.contact-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.contact-box dl { display: grid; grid-template-columns: 150px 1fr; gap: 10px 16px; margin: 0; font-size: 15px; }
.contact-box dt { color: var(--muted); }
.contact-box dd { margin: 0; }
@media (max-width: 560px) { .contact-box dl { grid-template-columns: 1fr; gap: 2px 0; } .contact-box dd { margin-bottom: 10px; } }
footer { border-top: 1px solid var(--border); padding: 28px 0 40px; font-size: 14px; color: var(--muted); }
footer .row { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
footer .row .links { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }

/* Legal pages */
.legal { padding: 44px 0 60px; }
.legal h2 { font-size: 21px; margin-top: 34px; }
.legal h3 { font-size: 17px; margin-top: 22px; }
.legal ul { margin: 0 0 14px; padding-left: 22px; color: var(--text); }
.legal li { margin-bottom: 7px; }
.legal .updated { color: var(--muted); font-size: 14px; }
.legal table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
.legal th, .legal td { border: 1px solid var(--border); padding: 10px 12px; text-align: left; vertical-align: top; }
.legal th { background: var(--bg-soft); }

/* Bỏ qua điều hướng, hiện ra khi dùng bàn phím */
.skip { position: absolute; left: -9999px; top: 0; background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 100; }
.skip:focus { left: 0; text-decoration: none; }
a:focus-visible, .btn:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

/* Đường dẫn phân cấp */
.crumb { font-size: 13.5px; color: var(--muted); margin-bottom: 14px; }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--accent); }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--accent); }