/* ==========================================================================
   LAYOUT.CSS — Layout Utilities & Grid System
   Art Gallery Design System
   ========================================================================== */


/* ==========================================================================
   CONTAINERS
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

@media (min-width: 640px) {
  .container {
    padding-inline: var(--space-lg);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-xl);
  }
}

.container-narrow,
.container-sm {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

@media (min-width: 640px) {
  .container-narrow,
  .container-sm,
  .container-wide {
    padding-inline: var(--space-lg);
  }
}

@media (min-width: 1024px) {
  .container-narrow,
  .container-sm,
  .container-wide {
    padding-inline: var(--space-xl);
  }
}


/* ==========================================================================
   CSS GRID SYSTEM
   ========================================================================== */

.grid {
  display: grid;
  gap: var(--space-lg);
}

/* --------------------------------------------------------------------------
   Fixed Column Grids (responsive)
   -------------------------------------------------------------------------- */

/* 2-column grid */
.grid-2 {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 3-column grid */
.grid-3 {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 4-column grid */
.grid-4 {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Art Card Grid — Auto-fill responsive
   -------------------------------------------------------------------------- */
.grid-art {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

@media (max-width: 639px) {
  .grid-art {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-md);
  }
}

/* Tighter art grid variant */
.grid-art-compact {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}


/* ==========================================================================
   FLEXBOX UTILITIES
   ========================================================================== */

.flex {
  display: flex;
}

.flex-inline {
  display: inline-flex;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.flex-start {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.flex-end {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-col-center {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-1 {
  flex: 1;
}

.flex-shrink-0 {
  flex-shrink: 0;
}

.items-start {
  align-items: flex-start;
}

.items-center {
  align-items: center;
}

.items-end {
  align-items: flex-end;
}

.items-stretch {
  align-items: stretch;
}

.justify-start {
  justify-content: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-end {
  justify-content: flex-end;
}

.self-start {
  align-self: flex-start;
}

.self-center {
  align-self: center;
}

.self-end {
  align-self: flex-end;
}

/* --------------------------------------------------------------------------
   Gap Utilities
   -------------------------------------------------------------------------- */
.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); }
.gap-3xl { gap: var(--space-3xl); }


/* ==========================================================================
   SECTION SPACING
   ========================================================================== */

.section {
  padding-block: var(--space-2xl);
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-3xl);
  }
}

.section-lg {
  padding-block: var(--space-3xl);
}

@media (min-width: 1024px) {
  .section-lg {
    padding-block: 6rem;
  }
}

.section-sm {
  padding-block: var(--space-xl);
}


/* ==========================================================================
   PAGE HEADER
   ========================================================================== */

.page-header {
  padding-block: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-2xl);
}

@media (min-width: 1024px) {
  .page-header {
    padding-block: var(--space-xl);
    margin-bottom: var(--space-xl);
  }
}

.page-header-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: var(--tracking-tight);
}

.page-header-subtitle {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 600px;
}

.page-header-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

@media (min-width: 640px) {
  .page-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
  }

  .page-header-row .page-header-actions {
    margin-top: 0;
    flex-shrink: 0;
  }
}


/* ==========================================================================
   SIDEBAR LAYOUT
   ========================================================================== */

.layout-sidebar {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

@media (min-width: 1024px) {
  .layout-sidebar {
    flex-direction: row;
  }
}

.layout-sidebar-aside {
  width: 100%;
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .layout-sidebar-aside {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
  }
}

.layout-sidebar-main {
  flex: 1;
  min-width: 0;
}

@media (min-width: 1024px) {
  .layout-sidebar-main {
    margin-left: var(--sidebar-width);
  }
}

/* Content area with sidebar offset */
.layout-content {
  flex: 1;
  min-width: 0;
  padding: var(--space-lg);
}

@media (min-width: 1024px) {
  .layout-content {
    padding: var(--space-xl) var(--space-2xl);
  }
}


/* ==========================================================================
   TWO-COLUMN CONTENT LAYOUT
   ========================================================================== */

.layout-two-col {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .layout-two-col {
    grid-template-columns: 1fr 1fr;
  }
}

/* Asymmetric: wide left, narrow right */
.layout-two-col-wide {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .layout-two-col-wide {
    grid-template-columns: 2fr 1fr;
  }
}

/* Asymmetric: narrow left, wide right */
.layout-two-col-aside {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .layout-two-col-aside {
    grid-template-columns: 280px 1fr;
  }
}


/* ==========================================================================
   VISIBILITY & ACCESSIBILITY
   ========================================================================== */

/* --------------------------------------------------------------------------
   Hidden
   -------------------------------------------------------------------------- */
.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Screen Reader Only — Visually hidden but accessible
   -------------------------------------------------------------------------- */
.sr-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;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* --------------------------------------------------------------------------
   Responsive Visibility
   -------------------------------------------------------------------------- */

/* Hide on mobile (below 640px) */
.hide-mobile {
  display: none;
}

@media (min-width: 640px) {
  .hide-mobile {
    display: initial;
  }
}

/* Hide on desktop (640px and above) */
@media (min-width: 640px) {
  .hide-desktop {
    display: none;
  }
}

/* Hide on tablet+ (1024px and above) */
@media (min-width: 1024px) {
  .hide-tablet-up {
    display: none;
  }
}

/* Show only on tablet+ */
.show-tablet-up {
  display: none;
}

@media (min-width: 1024px) {
  .show-tablet-up {
    display: initial;
  }
}


/* ==========================================================================
   SPACING UTILITIES
   ========================================================================== */

/* Margin bottom */
.mb-0   { margin-bottom: 0; }
.mb-xs  { margin-bottom: var(--space-xs); }
.mb-sm  { margin-bottom: var(--space-sm); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.mb-3xl { margin-bottom: var(--space-3xl); }

/* Margin top */
.mt-0   { margin-top: 0; }
.mt-xs  { margin-top: var(--space-xs); }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

/* Padding */
.p-0   { padding: 0; }
.p-xs  { padding: var(--space-xs); }
.p-sm  { padding: var(--space-sm); }
.p-md  { padding: var(--space-md); }
.p-lg  { padding: var(--space-lg); }
.p-xl  { padding: var(--space-xl); }
.p-2xl { padding: var(--space-2xl); }


/* ==========================================================================
   TEXT UTILITIES
   ========================================================================== */

.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

.text-primary   { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted     { color: var(--color-text-muted); }

.text-xs  { font-size: var(--text-xs); }
.text-sm  { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md  { font-size: var(--text-md); }
.text-lg  { font-size: var(--text-lg); }
.text-xl  { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }

.font-heading { font-family: var(--font-heading); }
.font-body    { font-family: var(--font-body); }

.font-light    { font-weight: var(--weight-light); }
.font-normal   { font-weight: var(--weight-normal); }
.font-medium   { font-weight: var(--weight-medium); }
.font-semibold { font-weight: var(--weight-semibold); }
.font-bold     { font-weight: var(--weight-bold); }

.uppercase     { text-transform: uppercase; }
.tracking-wide { letter-spacing: var(--tracking-wide); }
.tracking-wider { letter-spacing: var(--tracking-wider); }

.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;
}


/* ==========================================================================
   DIVIDERS
   ========================================================================== */

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-block: var(--space-xl);
}

.divider-sm {
  margin-block: var(--space-md);
}

.divider-lg {
  margin-block: var(--space-2xl);
}