:root {
  --primary: #ee4d2d; /* Màu cam Shopee */
  --primary-hover: #d73211;
  --bg-color: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --card-bg: #ffffff;
}

* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
  font-family: 'Inter', sans-serif; 
}

body { 
  padding-top: 70px; 
  background-color: var(--bg-color); 
  color: var(--text-main); 
  line-height: 1.5; 
}

.container { 
  max-width: 1100px; 
  margin: 0 auto; 
  padding: 0 20px; 
}

.muted-text { 
  font-size: 12px; 
  color: var(--text-muted); 
  text-align: center; /* Đảm bảo dòng chữ phụ bên dưới cũng căn giữa */
}

/* Responsive chung */
@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .input-group { flex-direction: column; }
  .input-group button { padding: 14px; }
}