* {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Fixed decorative backdrop: a faint circuit-style grid plus a couple of slowly drifting
   glow blobs, so large empty stretches of page background aren't just flat color. Both
   layers are `fixed` (cheap - no repaint on scroll) and animate only `transform`/opacity
   (GPU-friendly). Sits behind every card/header via a negative z-index; prefers-reduced-motion
   is already handled globally above. */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  z-index: -2;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.4;
  mask-image: radial-gradient(120% 85% at 50% 0%, #000 35%, transparent 90%);
  -webkit-mask-image: radial-gradient(120% 85% at 50% 0%, #000 35%, transparent 90%);
}

body::after {
  z-index: -1;
  inset: -10%;
  background-image:
    radial-gradient(36vw 36vw at 10% 5%, var(--accent-soft), transparent 65%),
    radial-gradient(30vw 30vw at 92% 15%, var(--brand-gradient-end), transparent 60%),
    radial-gradient(34vw 34vw at 50% 108%, var(--accent-soft), transparent 65%);
  opacity: 0.5;
  filter: blur(2px);
  animation: bg-drift 40s ease-in-out infinite alternate;
}

@keyframes bg-drift {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-1.5%, 1.5%, 0) scale(1.04); }
  100% { transform: translate3d(1.5%, -1%, 0) scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.brand:hover, .btn:hover, .chip:hover, .mod-card:hover, .nav-links a:hover,
.menu__item:hover, .shop-sidebar__link:hover, .admin-nav a:hover, .user-chip:hover,
.icon-btn:hover {
  text-decoration: none;
}

h1, h2, h3, h4 {
  margin: 0 0 var(--space-3);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

h1 { font-size: 38px; }
h2 { font-size: 27px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }

p { margin: 0 0 var(--space-3); }

.mono { font-family: var(--font-mono); }
.lead {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 60ch;
}

.container {
  max-width: min(1440px, 94vw);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.page {
  padding: var(--space-6) 0 var(--space-8);
  animation: page-in 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes page-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.text-muted { color: var(--text-muted); }
.text-faint { color: var(--text-faint); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }

.stack { display: flex; flex-direction: column; }
.row { display: flex; align-items: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.wrap { flex-wrap: wrap; }
.between { justify-content: space-between; }
.grow { flex: 1; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.shrink-0 { flex-shrink: 0; }

.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }

::selection {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

@media (max-width: 860px) {
  .container { padding: 0 var(--space-4); }
  h1 { font-size: 30px; }
  h2 { font-size: 23px; }
}