/* ===================================================
   Utilities — Layout, spacing, typography, display, color
   =================================================== */

/* --- Display --- */
.block        { display: block; }
.inline-block { display: inline-block; }
.flex         { display: flex; }
.inline-flex  { display: inline-flex; }
.grid         { display: grid; }
.hidden       { display: none; }

/* --- Flex --- */
.flex-column  { flex-direction: column; }
.flex-row     { flex-direction: row; }
.flex-wrap    { flex-wrap: wrap; }
.align-items-center { align-items: center; }
.align-items-start  { align-items: flex-start; }
.align-items-end    { align-items: flex-end; }
.justify-center  { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end     { justify-content: flex-end; }
.gap-xs  { gap: var(--space-xs); }
.gap-sm  { gap: var(--space-sm); }
.gap-md  { gap: var(--space-md); }
.gap-lg  { gap: var(--space-lg); }
.gap-xl  { gap: var(--space-xl); }
.gap-2xl { gap: var(--space-2xl); }
.flex-grow { flex: 1; }

/* --- Grid --- */
.grid-columns-1 { grid-template-columns: 1fr; }
.grid-columns-2 { grid-template-columns: repeat(2, 1fr); }
.grid-columns-3 { grid-template-columns: repeat(3, 1fr); }

/* --- Width --- */
.width-full   { width: 100%; }
.width-prose  { max-width: var(--w-prose); }
.width-wide   { max-width: var(--w-wide); }
.margin-inline-auto { margin-inline: auto; }

/* --- Padding --- */
.padding-0              { padding: 0; }
.padding-half           { padding: var(--space-lg); }
.padding                { padding: var(--space-2xl); }
.padding-double         { padding: var(--space-4xl); }
.padding-inline-half    { padding-inline: var(--space-lg); }
.padding-inline         { padding-inline: var(--space-2xl); }
.padding-inline-double  { padding-inline: var(--space-4xl); }
.padding-block-half     { padding-block: var(--space-lg); }
.padding-block          { padding-block: var(--space-2xl); }
.padding-block-double   { padding-block: var(--space-4xl); }
.padding-block-start-half   { padding-block-start: var(--space-lg); }
.padding-block-start        { padding-block-start: var(--space-2xl); }
.padding-block-start-double { padding-block-start: var(--space-4xl); }
.padding-block-end-half     { padding-block-end: var(--space-lg); }
.padding-block-end          { padding-block-end: var(--space-2xl); }
.padding-block-end-double   { padding-block-end: var(--space-4xl); }

/* --- Margin --- */
.margin-0    { margin: 0; }
.margin-block-half         { margin-block: var(--space-lg); }
.margin-block              { margin-block: var(--space-2xl); }
.margin-block-double       { margin-block: var(--space-4xl); }
.margin-block-start-half   { margin-block-start: var(--space-lg); }
.margin-block-start        { margin-block-start: var(--space-2xl); }
.margin-block-start-double { margin-block-start: var(--space-4xl); }
.margin-block-end-half     { margin-block-end: var(--space-lg); }
.margin-block-end          { margin-block-end: var(--space-2xl); }
.margin-block-end-double   { margin-block-end: var(--space-4xl); }

/* --- Typography --- */
.font-family-serif { font-family: var(--font-serif); }
.font-family-sans  { font-family: var(--font-sans); }
.font-family-mono  { font-family: var(--font-mono); }
.txt-x-small   { font-size: var(--txt-x-small); }
.txt-small     { font-size: var(--txt-small); }
.txt-normal    { font-size: var(--txt-normal); }
.txt-large     { font-size: var(--txt-large); }
.txt-x-large   { font-size: var(--txt-x-large); }
.txt-xx-large  { font-size: var(--txt-xx-large); }
.txt-xxx-large { font-size: var(--txt-xxx-large); }
.font-weight-bold    { font-weight: 700; }
.font-weight-semibold { font-weight: 600; }
.font-weight-normal  { font-weight: 400; }
.font-style-italic   { font-style: italic; }
.uppercase    { text-transform: uppercase; }
.letter-spacing-wide { letter-spacing: 0.05em; }
.letter-spacing-wider { letter-spacing: 0.1em; }
.line-height-tight { line-height: 1.2; }
.line-height-snug  { line-height: 1.4; }
.line-height-normal { line-height: 1.65; }
.text-align-center { text-align: center; }
.text-align-left   { text-align: left; }
.text-align-right  { text-align: right; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- Colors --- */
.color-text-1 { color: var(--text-1); }
.color-text-2 { color: var(--text-2); }
.color-text-3 { color: var(--text-3); }
.color-accent { color: var(--link-color); }
.background-surface-0 { background-color: var(--surface-0); }
.background-surface-1 { background-color: var(--surface-1); }
.background-surface-2 { background-color: var(--surface-2); }
.background-surface-3 { background-color: var(--surface-3); }

/* --- Borders --- */
.border       { border: 1px solid var(--border-1); }
.border-emphasis { border: 1px solid var(--border-2); }
.border-block-end   { border-block-end: 1px solid var(--border-1); }
.border-block-start { border-block-start: 1px solid var(--border-1); }
.border-radius-sm { border-radius: var(--radius-sm); }
.border-radius-md { border-radius: var(--radius-md); }
.border-radius-lg { border-radius: var(--radius-lg); }
.border-radius-full { border-radius: 9999px; }

/* --- Position --- */
.relative { position: relative; }
.absolute { position: absolute; }
.sticky   { position: sticky; }
.fixed    { position: fixed; }
.top-0    { top: 0; }
.inset-0  { inset: 0; }
.z-index-10 { z-index: 10; }
.z-index-20 { z-index: 20; }
.z-index-50 { z-index: 50; }

/* --- Misc --- */
.overflow-hidden { overflow: hidden; }
.cursor-pointer  { cursor: pointer; }
.user-select-none { user-select: none; }
.screen-reader-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}
.transition {
  transition-property: color, background-color, border-color, opacity, transform;
  transition-duration: 200ms;
  transition-timing-function: ease;
}

/* --- Images --- */
.object-fit-cover { object-fit: cover; }
.aspect-ratio-book { aspect-ratio: 2 / 3; }

/* --- Small caps label pattern --- */
.label {
  font-size: var(--txt-x-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-2);
}