/* Reset + base typography. Inherits tokens.css. */

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: var(--lh-body);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden; /* safety net against accidental horizontal scroll on mobile */
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  line-height: 1.1;
}

h1, h2 { font-size: var(--fs-h2); line-height: var(--lh-tight); }
h3     { font-size: var(--fs-h3); line-height: var(--lh-h3); }
h4     { font-size: var(--fs-h4); line-height: var(--lh-h4); }

p {
  margin: 0 0 var(--space-4);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-text);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary-hover); text-decoration: underline; }
a:active { color: var(--color-primary-active); }

img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol { margin: 0 0 var(--space-4); padding-left: var(--space-5); }
li { margin-bottom: var(--space-1); }

hr {
  border: 0;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-8) 0;
}

::selection { background: var(--color-primary); color: #fff; }

/* Container */
.ibm-container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad-desktop);
}
@media (max-width: 992px) {
  .ibm-container { padding-inline: var(--container-pad-tablet); }
}
@media (max-width: 576px) {
  .ibm-container { padding-inline: var(--container-pad-mobile); }
}

/* Skip link (a11y) */
.ibm-skip {
  position: absolute;
  left: -9999px;
  top: 0;
}
.ibm-skip:focus {
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  z-index: 9999;
}

/* Visually-hidden utility */
.ibm-visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* Section spacing */
.ibm-section { padding: var(--space-15) 0; }
@media (max-width: 992px) {
  .ibm-section { padding: 40px 0; }
}
@media (max-width: 576px) {
  .ibm-section { padding: 24px 0; }
}

.ibm-section--lg { padding: var(--space-21) 0; }
.ibm-section--dark { background: var(--color-bg-dark); color: var(--color-text-on-dark); }
.ibm-section--dark h1,
.ibm-section--dark h2,
.ibm-section--dark h3,
.ibm-section--dark h4,
.ibm-section--dark p { color: var(--color-text-on-dark); }