/* Reset transform + chuẩn hóa typography */
html { -webkit-text-size-adjust: 100%; text-rendering: optimizeLegibility; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
               Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.6;
  color: #0f172a; /* slate-900 */
}
/* KHÔNG cưỡng ép viết hoa: */
* { text-transform: none !important; }
/* Heading gọn gàng */
h1,h2,h3,h4 { line-height: 1.2; letter-spacing: -0.015em; }
/* Link */
a { text-decoration: none; }
a:hover { text-decoration: underline; }
/* Container tiện dùng */
.container { max-width: 72rem; margin-inline: auto; padding-inline: 1.5rem; }
.card { border: 1px solid #e2e8f0; border-radius: 1rem; padding: 1.25rem; }
.btn {
  display: inline-block; padding: .75rem 1.25rem; border-radius: .75rem; font-weight: 600;
}
.btn-primary { background: #2563eb; color: #fff; }
.btn-outline { border: 1px solid #cbd5e1; color: #0f172a; background: #fff; }
.badge { font-size: .875rem; color:#64748b }