:root {
  --giay: #F3E9D2;
  --the: #FBF5E6;
  --son: #9B1B1E;
  --sonDam: #6E1012;
  --dong: #B8862F;
  --muc: #2A2118;
  --mucNhat: #6B5B4A;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--giay); color: var(--muc);
  font: 17px/1.65 "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
}
.khung { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
header a { color: inherit; text-decoration: none; }
.ten { font-family: "Noto Serif", Georgia, serif; font-weight: 700; font-size: 24px; color: var(--sonDam); line-height: 1.2; }
.ten small { display: block; font: 14px "Be Vietnam Pro", system-ui, sans-serif; color: var(--mucNhat); font-weight: 400; }
h1, h2 { font-family: "Noto Serif", Georgia, serif; color: var(--sonDam); line-height: 1.3; }
h1 { font-size: 30px; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 22px 0 4px; }
p, li { margin: 0 0 10px; }
ul { padding-left: 22px; }
a { color: var(--son); }
.the { background: var(--the); border: 1px solid var(--dong); padding: 18px 20px; margin: 20px 0; }
.nut {
  display: inline-block; background: var(--son); color: #F6D98B; text-decoration: none;
  font-family: "Noto Serif", Georgia, serif; font-weight: 700; padding: 12px 22px; border: 2px solid var(--dong);
}
.nho { font-size: 14px; color: var(--mucNhat); }
nav { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 44px; padding-top: 16px; border-top: 1px solid var(--dong); font-size: 15px; }
hr { border: 0; border-top: 1px solid var(--dong); margin: 40px 0; }