/* Minimal modern reset + base layout helpers */
/* Based on modern-normalize principles */

/* 1. Reset & base */
* { box-sizing: border-box; }
html, body { height: 100%; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }

/* 2. Links */
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-600); text-decoration: underline; }

/* 3. Container */
.container { max-width: var(--container-max); margin-inline: auto; padding-inline: var(--container-pad); }

/* 4. Headings */
h1 { font-size: var(--step-4); line-height: 1.2; margin: 0 0 var(--space-4); }
h2 { font-size: var(--step-3); line-height: 1.25; margin: var(--space-6) 0 var(--space-3); }
h3 { font-size: var(--step-2); line-height: 1.3; margin: var(--space-5) 0 var(--space-2); }
h4 { font-size: var(--step-1); line-height: 1.35; margin: var(--space-4) 0 var(--space-2); }

/* 5. Cards, Surfaces */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}
.card:hover { box-shadow: var(--shadow-md); transition: box-shadow var(--transition-std); }

/* 6. Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: var(--radius-md);
  border: 1px solid transparent; cursor: pointer;
  background: var(--color-primary); color: #fff;
  box-shadow: var(--shadow-sm); transition: transform var(--transition-quick), box-shadow var(--transition-std), background var(--transition-std);
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); background: var(--color-primary-600); }
.btn:active { transform: translateY(0); }
.btn.secondary { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border); }
.btn.danger { background: var(--color-danger); }
.btn.success { background: var(--color-success); }

/* 7. Badges & chips */
.badge { display: inline-block; padding: 4px 10px; font-size: var(--step--1); border-radius: var(--radius-pill); background: var(--color-surface-2); border: 1px solid var(--color-border); color: var(--color-muted); }
.badge.primary { background: rgba(59,130,246,0.1); color: var(--color-primary-700); border-color: rgba(59,130,246,0.2); }

/* 8. Inputs */
.input, select, .select, textarea {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-md);
  border: 1px solid var(--color-border); background: var(--color-surface);
}
.input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.15); }

/* 9. Utilities */
.grid { display: grid; gap: var(--space-5); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-auto-fit-250 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.flex { display: flex; gap: var(--space-3); }
.flex-center { display: flex; align-items: center; justify-content: center; }
.stack > * + * { margin-block-start: var(--space-3); }
.muted { color: var(--color-muted); }

/* 10. Skeleton */
.skeleton { position: relative; background: linear-gradient(90deg, rgba(0,0,0,0.06), rgba(0,0,0,0.12), rgba(0,0,0,0.06)); background-size: 400% 100%; border-radius: var(--radius-md); }
@media (prefers-reduced-motion: no-preference) {
  .skeleton { animation: shimmer 1.6s infinite var(--ease-std); }
}
@keyframes shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: 0 0; }
}

/* 11. Motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}