grid.css

harun.bspt2014@gmail.com

I’ll build this as a reusable advanced assets/css/grid.css for RX Theme: CSS variables, containers, responsive grids, auto-fit layouts, flex utilities, gaps, order, alignment, and WordPress-friendly helpers.

Friend, create this file:

rx-theme/assets/css/grid.css

Then paste this full advanced grid system code.

/*!
Theme Name: RX Theme
File: assets/css/grid.css
Description: Advanced responsive grid, container, flex, spacing, layout utilities for RX Theme.
Author: RxHarun
Version: 1.0.0
*/

/* =========================================================
   01. ROOT GRID VARIABLES
   ========================================================= */

:root {
  /* Container widths */
  --rx-container-xs: 100%;
  --rx-container-sm: 540px;
  --rx-container-md: 720px;
  --rx-container-lg: 960px;
  --rx-container-xl: 1140px;
  --rx-container-xxl: 1320px;
  --rx-container-wide: 1440px;
  --rx-container-narrow: 860px;
  --rx-container-content: 760px;

  /* Spacing scale */
  --rx-gap-0: 0;
  --rx-gap-1: 0.25rem;
  --rx-gap-2: 0.5rem;
  --rx-gap-3: 0.75rem;
  --rx-gap-4: 1rem;
  --rx-gap-5: 1.25rem;
  --rx-gap-6: 1.5rem;
  --rx-gap-7: 1.75rem;
  --rx-gap-8: 2rem;
  --rx-gap-9: 2.5rem;
  --rx-gap-10: 3rem;
  --rx-gap-11: 4rem;
  --rx-gap-12: 5rem;

  /* Layout */
  --rx-grid-columns: 12;
  --rx-grid-gap: var(--rx-gap-6);
  --rx-container-padding: 1rem;

  /* Breakpoints as reference */
  --rx-bp-sm: 576px;
  --rx-bp-md: 768px;
  --rx-bp-lg: 992px;
  --rx-bp-xl: 1200px;
  --rx-bp-xxl: 1400px;

  /* Sidebar layouts */
  --rx-sidebar-width: 320px;
  --rx-sidebar-gap: 2rem;

  /* Card grid */
  --rx-card-min-width: 260px;
  --rx-post-card-min-width: 280px;
  --rx-product-card-min-width: 220px;
}

/* =========================================================
   02. UNIVERSAL BOX MODEL SAFETY
   ========================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  overflow-x: clip;
}

/* =========================================================
   03. CONTAINERS
   ========================================================= */

.rx-container,
.container {
  width: 100%;
  max-width: var(--rx-container-xl);
  margin-inline: auto;
  padding-inline: var(--rx-container-padding);
}

.rx-container-fluid,
.container-fluid {
  width: 100%;
  max-width: 100%;
  margin-inline: auto;
  padding-inline: var(--rx-container-padding);
}

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

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

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

.rx-container-full {
  width: 100%;
  max-width: none;
  margin-inline: auto;
}

.rx-full-bleed {
  width: 100vw;
  margin-left: 50%;
  transform: translateX(-50%);
}

.rx-alignwide {
  width: min(100%, var(--rx-container-wide));
  margin-inline: auto;
}

.rx-alignfull {
  width: 100vw;
  max-width: 100vw;
  margin-left: 50%;
  transform: translateX(-50%);
}

/* WordPress block alignment support */
.alignwide {
  width: min(100%, var(--rx-container-wide));
  max-width: var(--rx-container-wide);
  margin-inline: auto;
}

.alignfull {
  width: 100vw;
  max-width: 100vw;
  margin-left: 50%;
  transform: translateX(-50%);
}

/* =========================================================
   04. RESPONSIVE CONTAINER WIDTHS
   ========================================================= */

@media (min-width: 576px) {
  .rx-container,
  .container {
    max-width: var(--rx-container-sm);
  }
}

@media (min-width: 768px) {
  .rx-container,
  .container {
    max-width: var(--rx-container-md);
  }
}

@media (min-width: 992px) {
  .rx-container,
  .container {
    max-width: var(--rx-container-lg);
  }
}

@media (min-width: 1200px) {
  .rx-container,
  .container {
    max-width: var(--rx-container-xl);
  }
}

@media (min-width: 1400px) {
  .rx-container,
  .container {
    max-width: var(--rx-container-xxl);
  }
}

/* =========================================================
   05. CORE GRID SYSTEM
   ========================================================= */

.rx-row,
.row {
  display: flex;
  flex-wrap: wrap;
  margin-inline: calc(var(--rx-grid-gap) / -2);
}

.rx-row > *,
.row > * {
  width: 100%;
  max-width: 100%;
  padding-inline: calc(var(--rx-grid-gap) / 2);
}

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

.rx-grid-inline {
  display: inline-grid;
  gap: var(--rx-grid-gap);
}

/* 12-column CSS grid */
.rx-grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-10 {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-8 {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-6 {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-5 {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-1 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--rx-grid-gap);
}

/* =========================================================
   06. FLEX COLUMN SYSTEM
   ========================================================= */

.rx-col,
.col {
  flex: 1 0 0%;
}

.rx-col-auto,
.col-auto {
  flex: 0 0 auto;
  width: auto;
}

.rx-col-1,
.col-1 {
  flex: 0 0 auto;
  width: 8.333333%;
}

.rx-col-2,
.col-2 {
  flex: 0 0 auto;
  width: 16.666667%;
}

.rx-col-3,
.col-3 {
  flex: 0 0 auto;
  width: 25%;
}

.rx-col-4,
.col-4 {
  flex: 0 0 auto;
  width: 33.333333%;
}

.rx-col-5,
.col-5 {
  flex: 0 0 auto;
  width: 41.666667%;
}

.rx-col-6,
.col-6 {
  flex: 0 0 auto;
  width: 50%;
}

.rx-col-7,
.col-7 {
  flex: 0 0 auto;
  width: 58.333333%;
}

.rx-col-8,
.col-8 {
  flex: 0 0 auto;
  width: 66.666667%;
}

.rx-col-9,
.col-9 {
  flex: 0 0 auto;
  width: 75%;
}

.rx-col-10,
.col-10 {
  flex: 0 0 auto;
  width: 83.333333%;
}

.rx-col-11,
.col-11 {
  flex: 0 0 auto;
  width: 91.666667%;
}

.rx-col-12,
.col-12 {
  flex: 0 0 auto;
  width: 100%;
}

/* =========================================================
   07. GRID COLUMN SPAN UTILITIES
   ========================================================= */

.rx-span-1 {
  grid-column: span 1;
}

.rx-span-2 {
  grid-column: span 2;
}

.rx-span-3 {
  grid-column: span 3;
}

.rx-span-4 {
  grid-column: span 4;
}

.rx-span-5 {
  grid-column: span 5;
}

.rx-span-6 {
  grid-column: span 6;
}

.rx-span-7 {
  grid-column: span 7;
}

.rx-span-8 {
  grid-column: span 8;
}

.rx-span-9 {
  grid-column: span 9;
}

.rx-span-10 {
  grid-column: span 10;
}

.rx-span-11 {
  grid-column: span 11;
}

.rx-span-12 {
  grid-column: span 12;
}

.rx-span-full {
  grid-column: 1 / -1;
}

/* =========================================================
   08. AUTO RESPONSIVE GRID SYSTEM
   ========================================================= */

.rx-grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--rx-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-auto-sm {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-auto-md {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-auto-lg {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-auto-xl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-posts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--rx-post-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-grid-products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--rx-product-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
}

/* auto-fill keeps empty grid tracks */
.rx-grid-fill {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, var(--rx-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
}

/* auto-fit collapses empty tracks */
.rx-grid-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--rx-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
}

/* =========================================================
   09. COMMON WEBSITE LAYOUTS
   ========================================================= */

.rx-layout {
  display: grid;
  gap: var(--rx-sidebar-gap);
}

.rx-layout-sidebar-right {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rx-sidebar-width);
  gap: var(--rx-sidebar-gap);
  align-items: start;
}

.rx-layout-sidebar-left {
  display: grid;
  grid-template-columns: var(--rx-sidebar-width) minmax(0, 1fr);
  gap: var(--rx-sidebar-gap);
  align-items: start;
}

.rx-layout-two-sidebars {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 300px;
  gap: var(--rx-sidebar-gap);
  align-items: start;
}

.rx-layout-content {
  min-width: 0;
}

.rx-layout-sidebar {
  min-width: 0;
}

.rx-sticky-sidebar {
  position: sticky;
  top: var(--rx-sticky-top, 2rem);
}

/* Header layout */
.rx-header-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
}

/* Footer layout */
.rx-footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: var(--rx-gap-8);
}

/* Hero layout */
.rx-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: var(--rx-gap-10);
  align-items: center;
}

/* Medical/article content layout */
.rx-article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: var(--rx-gap-8);
  align-items: start;
}

.rx-article-content {
  min-width: 0;
}

.rx-article-sidebar {
  min-width: 0;
}

/* =========================================================
   10. RESPONSIVE SIDEBAR FALLBACK
   ========================================================= */

@media (max-width: 991.98px) {
  .rx-layout-sidebar-right,
  .rx-layout-sidebar-left,
  .rx-layout-two-sidebars,
  .rx-article-layout,
  .rx-hero-grid {
    grid-template-columns: 1fr;
  }

  .rx-layout-sidebar-left .rx-layout-sidebar {
    order: 2;
  }

  .rx-layout-sidebar-left .rx-layout-content {
    order: 1;
  }

  .rx-sticky-sidebar {
    position: static;
  }

  .rx-header-grid {
    grid-template-columns: 1fr auto;
  }
}

/* =========================================================
   11. GAP UTILITIES
   ========================================================= */

.rx-gap-0 {
  gap: var(--rx-gap-0) !important;
}

.rx-gap-1 {
  gap: var(--rx-gap-1) !important;
}

.rx-gap-2 {
  gap: var(--rx-gap-2) !important;
}

.rx-gap-3 {
  gap: var(--rx-gap-3) !important;
}

.rx-gap-4 {
  gap: var(--rx-gap-4) !important;
}

.rx-gap-5 {
  gap: var(--rx-gap-5) !important;
}

.rx-gap-6 {
  gap: var(--rx-gap-6) !important;
}

.rx-gap-7 {
  gap: var(--rx-gap-7) !important;
}

.rx-gap-8 {
  gap: var(--rx-gap-8) !important;
}

.rx-gap-9 {
  gap: var(--rx-gap-9) !important;
}

.rx-gap-10 {
  gap: var(--rx-gap-10) !important;
}

.rx-gap-11 {
  gap: var(--rx-gap-11) !important;
}

.rx-gap-12 {
  gap: var(--rx-gap-12) !important;
}

.rx-row-gap-0 {
  row-gap: var(--rx-gap-0) !important;
}

.rx-row-gap-4 {
  row-gap: var(--rx-gap-4) !important;
}

.rx-row-gap-6 {
  row-gap: var(--rx-gap-6) !important;
}

.rx-row-gap-8 {
  row-gap: var(--rx-gap-8) !important;
}

.rx-column-gap-0 {
  column-gap: var(--rx-gap-0) !important;
}

.rx-column-gap-4 {
  column-gap: var(--rx-gap-4) !important;
}

.rx-column-gap-6 {
  column-gap: var(--rx-gap-6) !important;
}

.rx-column-gap-8 {
  column-gap: var(--rx-gap-8) !important;
}

/* =========================================================
   12. DISPLAY UTILITIES
   ========================================================= */

.rx-d-none {
  display: none !important;
}

.rx-d-block {
  display: block !important;
}

.rx-d-inline {
  display: inline !important;
}

.rx-d-inline-block {
  display: inline-block !important;
}

.rx-d-flex {
  display: flex !important;
}

.rx-d-inline-flex {
  display: inline-flex !important;
}

.rx-d-grid {
  display: grid !important;
}

.rx-d-inline-grid {
  display: inline-grid !important;
}

/* =========================================================
   13. FLEX UTILITIES
   ========================================================= */

.rx-flex {
  display: flex;
}

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

.rx-flex-row {
  flex-direction: row !important;
}

.rx-flex-row-reverse {
  flex-direction: row-reverse !important;
}

.rx-flex-column {
  flex-direction: column !important;
}

.rx-flex-column-reverse {
  flex-direction: column-reverse !important;
}

.rx-flex-wrap {
  flex-wrap: wrap !important;
}

.rx-flex-nowrap {
  flex-wrap: nowrap !important;
}

.rx-flex-wrap-reverse {
  flex-wrap: wrap-reverse !important;
}

.rx-flex-fill {
  flex: 1 1 auto !important;
}

.rx-flex-grow-0 {
  flex-grow: 0 !important;
}

.rx-flex-grow-1 {
  flex-grow: 1 !important;
}

.rx-flex-shrink-0 {
  flex-shrink: 0 !important;
}

.rx-flex-shrink-1 {
  flex-shrink: 1 !important;
}

/* =========================================================
   14. JUSTIFY CONTENT
   ========================================================= */

.rx-justify-start {
  justify-content: flex-start !important;
}

.rx-justify-end {
  justify-content: flex-end !important;
}

.rx-justify-center {
  justify-content: center !important;
}

.rx-justify-between {
  justify-content: space-between !important;
}

.rx-justify-around {
  justify-content: space-around !important;
}

.rx-justify-evenly {
  justify-content: space-evenly !important;
}

/* Grid justify */
.rx-justify-items-start {
  justify-items: start !important;
}

.rx-justify-items-end {
  justify-items: end !important;
}

.rx-justify-items-center {
  justify-items: center !important;
}

.rx-justify-items-stretch {
  justify-items: stretch !important;
}

/* =========================================================
   15. ALIGNMENT UTILITIES
   ========================================================= */

.rx-items-start {
  align-items: flex-start !important;
}

.rx-items-end {
  align-items: flex-end !important;
}

.rx-items-center {
  align-items: center !important;
}

.rx-items-baseline {
  align-items: baseline !important;
}

.rx-items-stretch {
  align-items: stretch !important;
}

.rx-content-start {
  align-content: flex-start !important;
}

.rx-content-end {
  align-content: flex-end !important;
}

.rx-content-center {
  align-content: center !important;
}

.rx-content-between {
  align-content: space-between !important;
}

.rx-content-around {
  align-content: space-around !important;
}

.rx-content-stretch {
  align-content: stretch !important;
}

.rx-self-auto {
  align-self: auto !important;
}

.rx-self-start {
  align-self: flex-start !important;
}

.rx-self-end {
  align-self: flex-end !important;
}

.rx-self-center {
  align-self: center !important;
}

.rx-self-baseline {
  align-self: baseline !important;
}

.rx-self-stretch {
  align-self: stretch !important;
}

/* =========================================================
   16. PLACE UTILITIES
   ========================================================= */

.rx-place-start {
  place-content: start !important;
  place-items: start !important;
}

.rx-place-center {
  place-content: center !important;
  place-items: center !important;
}

.rx-place-end {
  place-content: end !important;
  place-items: end !important;
}

.rx-place-between {
  place-content: space-between !important;
}

/* =========================================================
   17. ORDER UTILITIES
   ========================================================= */

.rx-order-first {
  order: -1 !important;
}

.rx-order-0 {
  order: 0 !important;
}

.rx-order-1 {
  order: 1 !important;
}

.rx-order-2 {
  order: 2 !important;
}

.rx-order-3 {
  order: 3 !important;
}

.rx-order-4 {
  order: 4 !important;
}

.rx-order-5 {
  order: 5 !important;
}

.rx-order-last {
  order: 999 !important;
}

/* =========================================================
   18. WIDTH UTILITIES
   ========================================================= */

.rx-w-25 {
  width: 25% !important;
}

.rx-w-33 {
  width: 33.333333% !important;
}

.rx-w-50 {
  width: 50% !important;
}

.rx-w-66 {
  width: 66.666667% !important;
}

.rx-w-75 {
  width: 75% !important;
}

.rx-w-100 {
  width: 100% !important;
}

.rx-w-auto {
  width: auto !important;
}

.rx-min-w-0 {
  min-width: 0 !important;
}

.rx-max-w-100 {
  max-width: 100% !important;
}

/* =========================================================
   19. HEIGHT UTILITIES
   ========================================================= */

.rx-h-100 {
  height: 100% !important;
}

.rx-h-auto {
  height: auto !important;
}

.rx-min-h-100 {
  min-height: 100% !important;
}

.rx-min-vh-100 {
  min-height: 100vh !important;
}

/* =========================================================
   20. MARGIN AUTO UTILITIES
   ========================================================= */

.rx-mx-auto {
  margin-inline: auto !important;
}

.rx-my-auto {
  margin-block: auto !important;
}

.rx-ms-auto {
  margin-inline-start: auto !important;
}

.rx-me-auto {
  margin-inline-end: auto !important;
}

/* =========================================================
   21. GRID TEMPLATE ADVANCED UTILITIES
   ========================================================= */

.rx-grid-sidebar-right {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, var(--rx-sidebar-width));
  gap: var(--rx-sidebar-gap);
}

.rx-grid-sidebar-left {
  display: grid;
  grid-template-columns: minmax(260px, var(--rx-sidebar-width)) minmax(0, 1fr);
  gap: var(--rx-sidebar-gap);
}

.rx-grid-holy-grail {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 300px;
  gap: var(--rx-sidebar-gap);
}

.rx-grid-main-aside {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: var(--rx-sidebar-gap);
}

.rx-grid-aside-main {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(0, 2fr);
  gap: var(--rx-sidebar-gap);
}

.rx-grid-equal {
  display: grid;
  grid-auto-columns: 1fr;
  grid-auto-flow: column;
  gap: var(--rx-grid-gap);
}

@media (max-width: 991.98px) {
  .rx-grid-sidebar-right,
  .rx-grid-sidebar-left,
  .rx-grid-holy-grail,
  .rx-grid-main-aside,
  .rx-grid-aside-main,
  .rx-grid-equal {
    grid-template-columns: 1fr;
    grid-auto-flow: row;
  }
}

/* =========================================================
   22. RESPONSIVE GRID COLUMNS
   ========================================================= */

@media (max-width: 1199.98px) {
  .rx-grid-12,
  .rx-grid-10,
  .rx-grid-8,
  .rx-grid-6,
  .rx-grid-5 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 991.98px) {
  .rx-grid-12,
  .rx-grid-10,
  .rx-grid-8,
  .rx-grid-6,
  .rx-grid-5,
  .rx-grid-4 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .rx-span-4,
  .rx-span-5,
  .rx-span-6,
  .rx-span-7,
  .rx-span-8,
  .rx-span-9,
  .rx-span-10,
  .rx-span-11,
  .rx-span-12 {
    grid-column: span 3;
  }
}

@media (max-width: 767.98px) {
  .rx-grid-12,
  .rx-grid-10,
  .rx-grid-8,
  .rx-grid-6,
  .rx-grid-5,
  .rx-grid-4,
  .rx-grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rx-span-3,
  .rx-span-4,
  .rx-span-5,
  .rx-span-6,
  .rx-span-7,
  .rx-span-8,
  .rx-span-9,
  .rx-span-10,
  .rx-span-11,
  .rx-span-12 {
    grid-column: span 2;
  }
}

@media (max-width: 575.98px) {
  .rx-grid-12,
  .rx-grid-10,
  .rx-grid-8,
  .rx-grid-6,
  .rx-grid-5,
  .rx-grid-4,
  .rx-grid-3,
  .rx-grid-2 {
    grid-template-columns: 1fr;
  }

  [class*="rx-span-"] {
    grid-column: 1 / -1;
  }
}

/* =========================================================
   23. RESPONSIVE FLEX COLUMNS
   ========================================================= */

@media (min-width: 576px) {
  .rx-col-sm-auto {
    flex: 0 0 auto;
    width: auto;
  }

  .rx-col-sm-1 {
    flex: 0 0 auto;
    width: 8.333333%;
  }

  .rx-col-sm-2 {
    flex: 0 0 auto;
    width: 16.666667%;
  }

  .rx-col-sm-3 {
    flex: 0 0 auto;
    width: 25%;
  }

  .rx-col-sm-4 {
    flex: 0 0 auto;
    width: 33.333333%;
  }

  .rx-col-sm-5 {
    flex: 0 0 auto;
    width: 41.666667%;
  }

  .rx-col-sm-6 {
    flex: 0 0 auto;
    width: 50%;
  }

  .rx-col-sm-7 {
    flex: 0 0 auto;
    width: 58.333333%;
  }

  .rx-col-sm-8 {
    flex: 0 0 auto;
    width: 66.666667%;
  }

  .rx-col-sm-9 {
    flex: 0 0 auto;
    width: 75%;
  }

  .rx-col-sm-10 {
    flex: 0 0 auto;
    width: 83.333333%;
  }

  .rx-col-sm-11 {
    flex: 0 0 auto;
    width: 91.666667%;
  }

  .rx-col-sm-12 {
    flex: 0 0 auto;
    width: 100%;
  }
}

@media (min-width: 768px) {
  .rx-col-md-auto {
    flex: 0 0 auto;
    width: auto;
  }

  .rx-col-md-1 {
    flex: 0 0 auto;
    width: 8.333333%;
  }

  .rx-col-md-2 {
    flex: 0 0 auto;
    width: 16.666667%;
  }

  .rx-col-md-3 {
    flex: 0 0 auto;
    width: 25%;
  }

  .rx-col-md-4 {
    flex: 0 0 auto;
    width: 33.333333%;
  }

  .rx-col-md-5 {
    flex: 0 0 auto;
    width: 41.666667%;
  }

  .rx-col-md-6 {
    flex: 0 0 auto;
    width: 50%;
  }

  .rx-col-md-7 {
    flex: 0 0 auto;
    width: 58.333333%;
  }

  .rx-col-md-8 {
    flex: 0 0 auto;
    width: 66.666667%;
  }

  .rx-col-md-9 {
    flex: 0 0 auto;
    width: 75%;
  }

  .rx-col-md-10 {
    flex: 0 0 auto;
    width: 83.333333%;
  }

  .rx-col-md-11 {
    flex: 0 0 auto;
    width: 91.666667%;
  }

  .rx-col-md-12 {
    flex: 0 0 auto;
    width: 100%;
  }
}

@media (min-width: 992px) {
  .rx-col-lg-auto {
    flex: 0 0 auto;
    width: auto;
  }

  .rx-col-lg-1 {
    flex: 0 0 auto;
    width: 8.333333%;
  }

  .rx-col-lg-2 {
    flex: 0 0 auto;
    width: 16.666667%;
  }

  .rx-col-lg-3 {
    flex: 0 0 auto;
    width: 25%;
  }

  .rx-col-lg-4 {
    flex: 0 0 auto;
    width: 33.333333%;
  }

  .rx-col-lg-5 {
    flex: 0 0 auto;
    width: 41.666667%;
  }

  .rx-col-lg-6 {
    flex: 0 0 auto;
    width: 50%;
  }

  .rx-col-lg-7 {
    flex: 0 0 auto;
    width: 58.333333%;
  }

  .rx-col-lg-8 {
    flex: 0 0 auto;
    width: 66.666667%;
  }

  .rx-col-lg-9 {
    flex: 0 0 auto;
    width: 75%;
  }

  .rx-col-lg-10 {
    flex: 0 0 auto;
    width: 83.333333%;
  }

  .rx-col-lg-11 {
    flex: 0 0 auto;
    width: 91.666667%;
  }

  .rx-col-lg-12 {
    flex: 0 0 auto;
    width: 100%;
  }
}

@media (min-width: 1200px) {
  .rx-col-xl-auto {
    flex: 0 0 auto;
    width: auto;
  }

  .rx-col-xl-1 {
    flex: 0 0 auto;
    width: 8.333333%;
  }

  .rx-col-xl-2 {
    flex: 0 0 auto;
    width: 16.666667%;
  }

  .rx-col-xl-3 {
    flex: 0 0 auto;
    width: 25%;
  }

  .rx-col-xl-4 {
    flex: 0 0 auto;
    width: 33.333333%;
  }

  .rx-col-xl-5 {
    flex: 0 0 auto;
    width: 41.666667%;
  }

  .rx-col-xl-6 {
    flex: 0 0 auto;
    width: 50%;
  }

  .rx-col-xl-7 {
    flex: 0 0 auto;
    width: 58.333333%;
  }

  .rx-col-xl-8 {
    flex: 0 0 auto;
    width: 66.666667%;
  }

  .rx-col-xl-9 {
    flex: 0 0 auto;
    width: 75%;
  }

  .rx-col-xl-10 {
    flex: 0 0 auto;
    width: 83.333333%;
  }

  .rx-col-xl-11 {
    flex: 0 0 auto;
    width: 91.666667%;
  }

  .rx-col-xl-12 {
    flex: 0 0 auto;
    width: 100%;
  }
}

/* =========================================================
   24. MASONRY-LIKE CSS COLUMNS
   ========================================================= */

.rx-masonry {
  column-gap: var(--rx-grid-gap);
}

.rx-masonry-2 {
  columns: 2;
}

.rx-masonry-3 {
  columns: 3;
}

.rx-masonry-4 {
  columns: 4;
}

.rx-masonry-5 {
  columns: 5;
}

.rx-masonry > * {
  break-inside: avoid;
  margin-bottom: var(--rx-grid-gap);
}

@media (max-width: 991.98px) {
  .rx-masonry-4,
  .rx-masonry-5 {
    columns: 3;
  }
}

@media (max-width: 767.98px) {
  .rx-masonry-3,
  .rx-masonry-4,
  .rx-masonry-5 {
    columns: 2;
  }
}

@media (max-width: 575.98px) {
  .rx-masonry-2,
  .rx-masonry-3,
  .rx-masonry-4,
  .rx-masonry-5 {
    columns: 1;
  }
}

/* =========================================================
   25. STACK UTILITIES
   ========================================================= */

.rx-stack {
  display: flex;
  flex-direction: column;
  gap: var(--rx-grid-gap);
}

.rx-stack-xs {
  display: flex;
  flex-direction: column;
  gap: var(--rx-gap-2);
}

.rx-stack-sm {
  display: flex;
  flex-direction: column;
  gap: var(--rx-gap-4);
}

.rx-stack-md {
  display: flex;
  flex-direction: column;
  gap: var(--rx-gap-6);
}

.rx-stack-lg {
  display: flex;
  flex-direction: column;
  gap: var(--rx-gap-8);
}

.rx-stack-xl {
  display: flex;
  flex-direction: column;
  gap: var(--rx-gap-10);
}

/* =========================================================
   26. CLUSTER UTILITIES
   ========================================================= */

.rx-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-gap-4);
  align-items: center;
}

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

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

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

.rx-cluster-between {
  justify-content: space-between;
}

/* =========================================================
   27. CENTERING UTILITIES
   ========================================================= */

.rx-center {
  display: grid;
  place-items: center;
}

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

.rx-center-x {
  margin-inline: auto;
}

.rx-center-y {
  display: flex;
  align-items: center;
}

/* =========================================================
   28. MEDIA OBJECT
   ========================================================= */

.rx-media {
  display: flex;
  gap: var(--rx-gap-4);
  align-items: flex-start;
}

.rx-media-image {
  flex: 0 0 auto;
}

.rx-media-body {
  flex: 1 1 auto;
  min-width: 0;
}

@media (max-width: 575.98px) {
  .rx-media {
    flex-direction: column;
  }
}

/* =========================================================
   29. RESPONSIVE VISIBILITY
   ========================================================= */

@media (max-width: 575.98px) {
  .rx-hide-xs {
    display: none !important;
  }
}

@media (min-width: 576px) and (max-width: 767.98px) {
  .rx-hide-sm {
    display: none !important;
  }
}

@media (min-width: 768px) and (max-width: 991.98px) {
  .rx-hide-md {
    display: none !important;
  }
}

@media (min-width: 992px) and (max-width: 1199.98px) {
  .rx-hide-lg {
    display: none !important;
  }
}

@media (min-width: 1200px) {
  .rx-hide-xl {
    display: none !important;
  }
}

@media (min-width: 576px) {
  .rx-show-xs {
    display: none !important;
  }
}

@media (max-width: 575.98px) {
  .rx-show-sm-up,
  .rx-show-md-up,
  .rx-show-lg-up,
  .rx-show-xl-up {
    display: none !important;
  }
}

@media (max-width: 767.98px) {
  .rx-show-md-up,
  .rx-show-lg-up,
  .rx-show-xl-up {
    display: none !important;
  }
}

@media (max-width: 991.98px) {
  .rx-show-lg-up,
  .rx-show-xl-up {
    display: none !important;
  }
}

@media (max-width: 1199.98px) {
  .rx-show-xl-up {
    display: none !important;
  }
}

/* =========================================================
   30. WORDPRESS LOOP GRID HELPERS
   ========================================================= */

.rx-post-loop,
.rx-blog-grid,
.rx-archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--rx-post-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
}

.rx-post-loop-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--rx-gap-6);
}

.rx-related-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: var(--rx-gap-5);
}

.rx-widget-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--rx-gap-5);
}

.rx-navigation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--rx-gap-4);
}

@media (max-width: 575.98px) {
  .rx-navigation-grid {
    grid-template-columns: 1fr;
  }
}

/* =========================================================
   31. EQUAL HEIGHT CARD GRID
   ========================================================= */

.rx-equal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--rx-card-min-width)), 1fr));
  gap: var(--rx-grid-gap);
  align-items: stretch;
}

.rx-equal-grid > * {
  height: 100%;
}

.rx-card-stretch {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.rx-card-stretch > .rx-card-body {
  flex: 1 1 auto;
}

/* =========================================================
   32. IMAGE GRID HELPERS
   ========================================================= */

.rx-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: var(--rx-gap-4);
}

.rx-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
  gap: var(--rx-gap-3);
}

.rx-gallery-grid img,
.rx-image-grid img {
  width: 100%;
  height: auto;
  display: block;
}

.rx-gallery-crop img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.rx-gallery-landscape img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.rx-gallery-portrait img {
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

/* =========================================================
   33. TABLE-LIKE GRID HELPERS
   ========================================================= */

.rx-table-grid {
  display: grid;
  gap: 0;
  overflow-x: auto;
}

.rx-table-row {
  display: grid;
  grid-template-columns: repeat(var(--rx-table-columns, 4), minmax(120px, 1fr));
  min-width: max-content;
}

.rx-table-cell {
  padding: var(--rx-gap-3) var(--rx-gap-4);
  border-bottom: 1px solid currentColor;
}

/* =========================================================
   34. CSS SUBGRID SUPPORT
   ========================================================= */

@supports (grid-template-columns: subgrid) {
  .rx-subgrid {
    display: grid;
    grid-template-columns: subgrid;
  }

  .rx-subgrid-rows {
    display: grid;
    grid-template-rows: subgrid;
  }
}

/* =========================================================
   35. CONTAINER QUERY SUPPORT
   ========================================================= */

.rx-container-query,
.rx-cq {
  container-type: inline-size;
}

@container (min-width: 480px) {
  .rx-cq-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--rx-grid-gap);
  }
}

@container (min-width: 720px) {
  .rx-cq-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--rx-grid-gap);
  }
}

@container (min-width: 960px) {
  .rx-cq-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--rx-grid-gap);
  }
}

/* =========================================================
   36. SAFE OVERFLOW UTILITIES
   ========================================================= */

.rx-overflow-hidden {
  overflow: hidden !important;
}

.rx-overflow-auto {
  overflow: auto !important;
}

.rx-overflow-x-auto {
  overflow-x: auto !important;
}

.rx-overflow-y-auto {
  overflow-y: auto !important;
}

.rx-overflow-clip {
  overflow: clip !important;
}

/* Prevent grid/flex text overflow */
.rx-min-0,
.rx-grid > *,
.rx-grid-12 > *,
.rx-grid-auto > *,
.rx-layout-content,
.rx-layout-sidebar {
  min-width: 0;
}

/* =========================================================
   37. RESPONSIVE TEXT COLUMNS
   ========================================================= */

.rx-text-columns-2 {
  column-count: 2;
  column-gap: var(--rx-gap-8);
}

.rx-text-columns-3 {
  column-count: 3;
  column-gap: var(--rx-gap-8);
}

@media (max-width: 767.98px) {
  .rx-text-columns-2,
  .rx-text-columns-3 {
    column-count: 1;
  }
}

/* =========================================================
   38. MODERN LAYOUT SHORTCUTS
   ========================================================= */

.rx-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-grid-gap);
}

.rx-switcher > * {
  flex-grow: 1;
  flex-basis: calc((var(--rx-switcher-threshold, 40rem) - 100%) * 999);
}

.rx-cover {
  display: flex;
  flex-direction: column;
  min-height: var(--rx-cover-height, 100vh);
}

.rx-cover-center {
  margin-block: auto;
}

.rx-sidebar-layout {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-sidebar-gap);
}

.rx-sidebar-layout > :first-child {
  flex-basis: var(--rx-sidebar-width);
  flex-grow: 1;
}

.rx-sidebar-layout > :last-child {
  flex-basis: 0;
  flex-grow: 999;
  min-width: min(100%, 50rem);
}

.rx-frame {
  aspect-ratio: var(--rx-frame-ratio, 16 / 9);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.rx-frame > img,
.rx-frame > video,
.rx-frame > iframe {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

/* =========================================================
   39. PRINT GRID SAFETY
   ========================================================= */

@media print {
  .rx-container,
  .container,
  .rx-container-wide,
  .rx-container-narrow,
  .rx-container-content {
    max-width: 100% !important;
    padding-inline: 0 !important;
  }

  .rx-grid,
  .rx-grid-12,
  .rx-grid-auto,
  .rx-layout-sidebar-right,
  .rx-layout-sidebar-left,
  .rx-article-layout {
    display: block !important;
  }

  .rx-hide-print {
    display: none !important;
  }
}

/* =========================================================
   40. REDUCED MOTION SAFETY
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
  .rx-grid *,
  .rx-row *,
  .rx-layout * {
    scroll-behavior: auto !important;
  }
}

Now enqueue it in your theme functions.php or in your enqueue file:

wp_enqueue_style(
    'rx-grid',
    get_template_directory_uri() . '/assets/css/grid.css',
    array(),
    wp_get_theme()->get('Version')
);

Best usage examples:

<div class="rx-container">
  <div class="rx-grid-auto">
    <article>Post 1</article>
    <article>Post 2</article>
    <article>Post 3</article>
  </div>
</div>
<div class="rx-container">
  <div class="rx-layout-sidebar-right">
    <main class="rx-layout-content">Main content</main>
    <aside class="rx-layout-sidebar rx-sticky-sidebar">Sidebar</aside>
  </div>
</div>
<div class="rx-container">
  <div class="rx-grid-12">
    <div class="rx-span-8">Main</div>
    <div class="rx-span-4">Sidebar</div>
  </div>
</div>

This grid.css is safe for advanced RX Theme development because it gives you Bootstrap-like columns, modern CSS grid, auto-fit cards, WordPress alignment, sidebar layouts, hero layouts, gallery grids, masonry style, container queries, and responsive utilities.

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