:root{--navy:#2b2f8f;--blue:#00a9e6;--light:#eaf6fd;--text:#1d2340;--muted:#5a6280;--fill:#fff3b0}
*{box-sizing:border-box}
body{margin:0;font-family:"Be Vietnam Pro",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.65;font-size:17px}
a{color:var(--navy)}
header{background:#fff;border-bottom:3px solid var(--blue);position:sticky;top:0;z-index:5}
.bar{max-width:1000px;margin:auto;display:flex;align-items:center;gap:12px;padding:8px 16px;flex-wrap:wrap}
.bar img{height:52px}
.bar .ten{font-weight:800;color:var(--navy);line-height:1.2}
.bar .ten small{display:block;font-weight:500;color:var(--muted);font-size:13px}
nav{margin-left:auto;display:flex;gap:14px;flex-wrap:wrap}
nav a{text-decoration:none;font-weight:600;font-size:15px}
nav a[aria-current]{color:var(--blue)}
.hero{background:linear-gradient(135deg,var(--navy),#1b6fb8 60%,var(--blue));color:#fff;padding:48px 16px}
.hero div{max-width:1000px;margin:auto}
.hero h1{font-size:clamp(26px,5vw,40px);line-height:1.2;margin:0 0 12px}
.hero p{font-size:19px;max-width:640px}
.nut{display:inline-block;background:#ffd400;color:#111;font-weight:800;padding:12px 22px;border-radius:30px;text-decoration:none;margin:6px 8px 0 0}
.nut.phu{background:#fff;color:var(--navy)}
main{max-width:1000px;margin:auto;padding:24px 16px 48px}
h2{color:var(--navy);margin-top:36px}
.the{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.the>div{background:var(--light);border-radius:12px;padding:16px}
.hoi{border-left:4px solid var(--blue);padding:4px 0 4px 16px;margin:24px 0}
.hoi h3{margin:0 0 6px}
.dien{background:var(--fill);color:#111;padding:0 4px;border-radius:4px}
footer{background:var(--navy);color:#dfe3ff;padding:24px 16px;font-size:15px}
footer div{max-width:1000px;margin:auto}
footer a{color:#fff}