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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

h1, h2, h3 {
  font-family: var(--font-display);
  margin: 0;
  line-height: 1.1;
}

p {
  margin: 0;
}

ul, ol, dl {
  margin: 0;
  padding: 0;
  list-style: none;
}

dd {
  margin: 0;
}

.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;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -3rem;
  background: var(--color-blue-500);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius);
  transition: top var(--dur-fast) var(--ease-out);
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-2);
}

:focus-visible {
  outline: 2px solid var(--color-blue-300);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Nav ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(9, 12, 17, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-family: var(--font-mono);
  font-size: 1rem;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: 0.04em;
}

.nav__brand span {
  color: var(--color-blue-300);
}

.nav__links {
  display: flex;
  gap: var(--space-4);
}

.nav__links a {
  position: relative;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  padding: var(--space-1) 0;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--color-blue-300);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-out);
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--color-blue-300);
}

.nav__links a:hover::after,
.nav__links a:focus-visible::after {
  transform: scaleX(1);
}

@media (max-width: 640px) {
  .nav__links {
    gap: var(--space-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav__links a,
  .nav__links a::after {
    transition: none !important;
  }
}