/* ==========================================================================
   base.css - Typography nền và các phần tử cơ bản
   ========================================================================== */

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
  font-weight: 700;
  line-height: var(--lh-heading);
  letter-spacing: -0.012em;
}

h1 { font-size: var(--fs-h1); line-height: var(--lh-display); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p {
  margin: 0;
}

strong,
b {
  font-weight: 700;
}

small {
  font-size: var(--fs-xs);
}

a {
  transition: color var(--dur) var(--ease);
}

a:hover {
  color: var(--color-accent);
}

::selection {
  background: var(--color-gold-light);
  color: var(--color-navy);
}

/* ------------------------------------------------------ Tiện ích chung */
.u-visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--color-navy);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
  color: #fff;
}