/* ==============================
   Utilities - gameengines.io
   ============================== */

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

/* Skip link - visible on focus for keyboard/screen-reader users */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 200;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-primary);
  color: white;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  transform: translateY(-100%);
  transition: transform var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.flow > * + * { margin-top: var(--space-lg); }
.flow--sm > * + * { margin-top: var(--space-sm); }
.flow--xl > * + * { margin-top: var(--space-2xl); }

.text-center { text-align: center; }
.text-mono { font-family: var(--font-mono); }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }
.text-lg { font-size: var(--font-size-lg); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.container--wide { max-width: 1400px; }
.container--narrow { max-width: 800px; }
.container--article { max-width: 680px; }

.flex { display: flex; }
.flex--wrap { flex-wrap: wrap; }
.flex--center { align-items: center; justify-content: center; }
.flex--between { justify-content: space-between; }
.flex--gap-xs { gap: var(--space-xs); }
.flex--gap-sm { gap: var(--space-sm); }
.flex--gap-md { gap: var(--space-md); }
.flex--gap-lg { gap: var(--space-lg); }
.inline-flex { display: inline-flex; }

.grid { display: grid; gap: var(--space-lg); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

.section { padding-block: var(--space-4xl); }
.section--sm { padding-block: var(--space-2xl); }
.section--lg { padding-block: var(--space-5xl); }

.divider {
  border: 0;
  height: 1px;
  background: var(--border-subtle);
  margin-block: var(--space-3xl);
}

/* ---- Tag / Pill ---- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 3px 10px;
  background: rgba(var(--color-primary-rgb), 0.12);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
  border: 1px solid rgba(var(--color-primary-rgb), 0.2);
  transition: background var(--duration-fast) var(--ease-out);
  text-decoration: none;
}

.tag:hover { background: rgba(var(--color-primary-rgb), 0.2); }
.tag--muted { background: var(--surface-4); color: var(--text-secondary); border-color: var(--border-subtle); }
.tag--success { background: rgba(var(--color-success-rgb), 0.12); color: var(--color-success); border-color: rgba(var(--color-success-rgb), 0.2); }
.tag--warning { background: rgba(var(--color-warning-rgb), 0.12); color: var(--color-warning); border-color: rgba(var(--color-warning-rgb), 0.2); }

/* ---- Lucide icon defaults ---- */
[data-lucide] {
  width: 18px;
  height: 18px;
  stroke-width: 1.5;
  vertical-align: middle;
}

/* ---- Gradient text ---- */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- Fade-in animation ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in-up { animation: fadeInUp var(--duration-slow) var(--ease-out) both; }
.fade-in-up--delay-1 { animation-delay: 100ms; }
.fade-in-up--delay-2 { animation-delay: 200ms; }
.fade-in-up--delay-3 { animation-delay: 300ms; }

/* ---- Logo swap (light/dark) ---- */
.logo-swap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.logo-swap__img {
  display: block;
}

.logo-swap__light {
  display: none;
}

.logo-swap__dark {
  display: block;
}

[data-theme="light"] .logo-swap__light {
  display: block;
}

[data-theme="light"] .logo-swap__dark {
  display: none;
}