/* Sổ Thu Chi — site tĩnh. Không JS, không font ngoài, không tracking. */

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: #f7f6f2;
  color: #1c1c1e;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  font-size: 17px;
}

header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid #e3e1da;
  background: #fffdf9;
}

header .brand { font-weight: 700; font-size: 20px; color: #1c1c1e; text-decoration: none; }

nav {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 15px;
}

main, footer { max-width: 640px; margin: 0 auto; padding: 20px 16px 48px; }
footer { padding-top: 0; color: #6b6b6f; font-size: 13px; }

h1 { font-size: 24px; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 28px 0 6px; color: #1c1c1e; }
p, ul { margin: 0 0 14px; color: #3a3a3c; }
ul { padding-left: 20px; }
.updated { color: #6b6b6f; font-size: 14px; margin-bottom: 22px; }
a { color: #0a6847; }