rx-responsive.css

harun.bspt2014@gmail.com

I’ll build this as a strong responsive CSS foundation for RX Theme: mobile-first, modern breakpoints, accessibility-friendly, WordPress-aware, and safe to place in assets/css/rx-responsive.css.

Friend, create this file:

assets/css/rx-responsive.css

Then paste this full responsive CSS code.

/*!
Theme Name: RX Theme
File: assets/css/rx-responsive.css
Purpose: Advanced responsive system for RX Theme
Author: RxHarun
*/

/* =========================================================
   RX THEME RESPONSIVE ROOT SYSTEM
   Mobile-first responsive design
========================================================= */

:root {
  --rx-container-xs: 100%;
  --rx-container-sm: 540px;
  --rx-container-md: 720px;
  --rx-container-lg: 960px;
  --rx-container-xl: 1140px;
  --rx-container-2xl: 1320px;
  --rx-container-3xl: 1440px;

  --rx-gutter-xs: 1rem;
  --rx-gutter-sm: 1.25rem;
  --rx-gutter-md: 1.5rem;
  --rx-gutter-lg: 2rem;
  --rx-gutter-xl: 2.5rem;

  --rx-space-1: 0.25rem;
  --rx-space-2: 0.5rem;
  --rx-space-3: 0.75rem;
  --rx-space-4: 1rem;
  --rx-space-5: 1.25rem;
  --rx-space-6: 1.5rem;
  --rx-space-8: 2rem;
  --rx-space-10: 2.5rem;
  --rx-space-12: 3rem;
  --rx-space-16: 4rem;
  --rx-space-20: 5rem;

  --rx-header-height-mobile: 64px;
  --rx-header-height-tablet: 72px;
  --rx-header-height-desktop: 84px;

  --rx-radius-sm: 6px;
  --rx-radius-md: 10px;
  --rx-radius-lg: 16px;
  --rx-radius-xl: 24px;

  --rx-responsive-font-body: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --rx-responsive-font-small: clamp(0.875rem, 0.84rem + 0.15vw, 1rem);
  --rx-responsive-font-h1: clamp(2rem, 1.45rem + 2.4vw, 4rem);
  --rx-responsive-font-h2: clamp(1.65rem, 1.25rem + 1.6vw, 3rem);
  --rx-responsive-font-h3: clamp(1.35rem, 1.1rem + 1vw, 2.25rem);
  --rx-responsive-font-h4: clamp(1.15rem, 1rem + 0.6vw, 1.6rem);

  --rx-content-width: 760px;
  --rx-wide-width: 1140px;
  --rx-full-width: 100%;

  --rx-sidebar-width: 320px;
  --rx-sidebar-gap: 2rem;

  --rx-z-mobile-menu: 9999;
  --rx-z-sticky-header: 999;
  --rx-z-overlay: 900;
}

/* =========================================================
   GLOBAL RESPONSIVE RESET
========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  overflow-x: hidden;
  font-size: var(--rx-responsive-font-body);
}

img,
picture,
video,
canvas,
svg,
iframe,
embed,
object {
  max-width: 100%;
}

img,
picture,
video,
canvas,
svg {
  height: auto;
}

iframe,
embed,
object {
  display: block;
}

table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
}

pre,
code,
kbd,
samp {
  max-width: 100%;
  overflow-wrap: break-word;
}

pre {
  overflow-x: auto;
  white-space: pre;
}

input,
button,
textarea,
select {
  max-width: 100%;
  font: inherit;
}

textarea {
  resize: vertical;
}

/* =========================================================
   RESPONSIVE CONTAINER SYSTEM
========================================================= */

.rx-container,
.container,
.site-container,
.wrap {
  width: 100%;
  max-width: var(--rx-container-2xl);
  margin-inline: auto;
  padding-inline: var(--rx-gutter-xs);
}

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

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

.rx-container-fluid {
  width: 100%;
  max-width: 100%;
  padding-inline: var(--rx-gutter-xs);
}

.rx-no-container {
  max-width: none;
  padding-inline: 0;
}

/* =========================================================
   RESPONSIVE TYPOGRAPHY
========================================================= */

h1,
.rx-h1,
.entry-title,
.page-title {
  font-size: var(--rx-responsive-font-h1);
  line-height: 1.1;
  text-wrap: balance;
}

h2,
.rx-h2 {
  font-size: var(--rx-responsive-font-h2);
  line-height: 1.18;
  text-wrap: balance;
}

h3,
.rx-h3 {
  font-size: var(--rx-responsive-font-h3);
  line-height: 1.25;
}

h4,
.rx-h4 {
  font-size: var(--rx-responsive-font-h4);
  line-height: 1.3;
}

p,
li,
blockquote,
.entry-content {
  overflow-wrap: break-word;
}

.entry-content p {
  margin-block-end: 1.25em;
}

.rx-text-fluid {
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
}

.rx-text-small-fluid {
  font-size: var(--rx-responsive-font-small);
}

.rx-title-fluid {
  font-size: clamp(2rem, 1rem + 5vw, 5rem);
  line-height: 1;
}

/* =========================================================
   RESPONSIVE GRID SYSTEM
========================================================= */

.rx-grid {
  display: grid;
  gap: var(--rx-space-6);
}

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

.rx-grid-2,
.rx-grid-3,
.rx-grid-4,
.rx-grid-5,
.rx-grid-6 {
  grid-template-columns: 1fr;
}

.rx-auto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: var(--rx-space-6);
}

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

.rx-auto-grid-lg {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: var(--rx-space-8);
}

.rx-equal-grid {
  display: grid;
  grid-auto-rows: 1fr;
  gap: var(--rx-space-6);
}

/* =========================================================
   RESPONSIVE FLEX SYSTEM
========================================================= */

.rx-flex {
  display: flex;
  gap: var(--rx-space-4);
}

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

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

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

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

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

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

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

.rx-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-space-3);
  align-items: center;
}

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

.rx-section {
  padding-block: clamp(2.5rem, 5vw, 6rem);
}

.rx-section-sm {
  padding-block: clamp(1.5rem, 3vw, 3rem);
}

.rx-section-lg {
  padding-block: clamp(4rem, 8vw, 9rem);
}

.rx-p-responsive {
  padding: clamp(1rem, 3vw, 3rem);
}

.rx-px-responsive {
  padding-inline: clamp(1rem, 4vw, 4rem);
}

.rx-py-responsive {
  padding-block: clamp(1.5rem, 5vw, 5rem);
}

.rx-gap-responsive {
  gap: clamp(1rem, 3vw, 3rem);
}

/* =========================================================
   WORDPRESS CORE RESPONSIVE SUPPORT
========================================================= */

.alignwide {
  max-width: var(--rx-wide-width);
  margin-inline: auto;
}

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

.wp-block-image img,
.wp-block-cover,
.wp-block-media-text,
.wp-block-gallery,
.wp-block-columns,
.wp-block-group,
.wp-block-query,
.wp-block-post-template {
  max-width: 100%;
}

.wp-block-columns {
  gap: var(--rx-space-6);
}

.wp-block-column {
  min-width: 0;
}

.wp-block-media-text {
  gap: var(--rx-space-6);
}

.wp-block-gallery {
  display: flex;
  flex-wrap: wrap;
}

.wp-block-table {
  overflow-x: auto;
}

.wp-block-table table {
  min-width: 640px;
}

.wp-caption {
  max-width: 100%;
}

.wp-caption img {
  display: block;
  margin-inline: auto;
}

.gallery {
  display: grid;
  gap: var(--rx-space-4);
}

.gallery-columns-1,
.gallery-columns-2,
.gallery-columns-3,
.gallery-columns-4,
.gallery-columns-5,
.gallery-columns-6,
.gallery-columns-7,
.gallery-columns-8,
.gallery-columns-9 {
  grid-template-columns: 1fr;
}

.gallery-item {
  margin: 0;
}

/* =========================================================
   SITE HEADER RESPONSIVE
========================================================= */

.site-header,
.rx-site-header {
  width: 100%;
  min-height: var(--rx-header-height-mobile);
}

.rx-header-inner,
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--rx-header-height-mobile);
  gap: var(--rx-space-4);
}

.custom-logo,
.site-logo img,
.rx-logo img {
  max-width: min(180px, 60vw);
  height: auto;
}

.site-title,
.rx-site-title {
  font-size: clamp(1.25rem, 1rem + 1vw, 2rem);
  line-height: 1.1;
}

.site-description,
.rx-site-description {
  font-size: clamp(0.8rem, 0.75rem + 0.25vw, 1rem);
}

/* Sticky header support */

.rx-sticky-header,
.site-header.is-sticky {
  position: sticky;
  top: 0;
  z-index: var(--rx-z-sticky-header);
}

/* Admin bar sticky offset */

.admin-bar .rx-sticky-header,
.admin-bar .site-header.is-sticky {
  top: 46px;
}

/* =========================================================
   NAVIGATION RESPONSIVE
========================================================= */

.main-navigation,
.rx-main-navigation {
  width: 100%;
}

.main-navigation ul,
.rx-main-navigation ul,
.primary-menu,
.rx-primary-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rx-menu-toggle,
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  border: 0;
  cursor: pointer;
}

.primary-menu,
.rx-primary-menu {
  display: none;
}

.primary-menu.is-open,
.rx-primary-menu.is-open,
.main-navigation.toggled ul,
.rx-main-navigation.toggled ul {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: fixed;
  inset: var(--rx-header-height-mobile) 0 0 0;
  z-index: var(--rx-z-mobile-menu);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--rx-space-4);
}

.primary-menu li,
.rx-primary-menu li {
  position: relative;
}

.primary-menu a,
.rx-primary-menu a,
.main-navigation a,
.rx-main-navigation a {
  display: block;
  padding: 0.875rem 1rem;
  text-decoration: none;
  line-height: 1.3;
}

.primary-menu .sub-menu,
.rx-primary-menu .sub-menu,
.main-navigation .sub-menu,
.rx-main-navigation .sub-menu {
  display: none;
  padding-left: var(--rx-space-4);
}

.primary-menu li:hover > .sub-menu,
.primary-menu li:focus-within > .sub-menu,
.rx-primary-menu li:hover > .sub-menu,
.rx-primary-menu li:focus-within > .sub-menu {
  display: block;
}

/* =========================================================
   HERO RESPONSIVE
========================================================= */

.rx-hero,
.hero,
.site-hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: clamp(420px, 70vh, 760px);
  padding-block: clamp(3rem, 8vw, 8rem);
  overflow: hidden;
}

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

.rx-hero-title,
.hero-title {
  font-size: clamp(2.25rem, 7vw, 6rem);
  line-height: 0.98;
  text-wrap: balance;
}

.rx-hero-subtitle,
.hero-subtitle {
  font-size: clamp(1rem, 1.2vw, 1.35rem);
  max-width: 65ch;
}

.rx-hero-actions,
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-space-3);
}

/* =========================================================
   CONTENT + SIDEBAR LAYOUT
========================================================= */

.rx-layout,
.site-layout,
.content-sidebar,
.sidebar-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--rx-sidebar-gap);
}

.site-main,
.content-area,
.primary-content,
.rx-primary-content {
  min-width: 0;
}

.widget-area,
.sidebar,
.rx-sidebar {
  min-width: 0;
}

.rx-sidebar .widget,
.widget-area .widget {
  margin-block-end: var(--rx-space-6);
}

/* =========================================================
   BLOG CARD RESPONSIVE
========================================================= */

.rx-post-grid,
.blog-grid,
.archive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--rx-space-6);
}

.rx-post-card,
.post-card,
.article-card {
  min-width: 0;
  overflow: hidden;
}

.rx-post-card img,
.post-card img,
.article-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.rx-card-title,
.entry-card-title {
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.6rem);
  line-height: 1.25;
}

.rx-card-meta,
.entry-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: var(--rx-responsive-font-small);
}

/* =========================================================
   SINGLE POST RESPONSIVE
========================================================= */

.single .entry-header,
.page .entry-header {
  max-width: var(--rx-content-width);
  margin-inline: auto;
}

.single .entry-content,
.page .entry-content {
  max-width: var(--rx-content-width);
  margin-inline: auto;
}

.entry-content > * {
  max-width: 100%;
}

.entry-content img {
  height: auto;
}

.entry-content figure {
  max-width: 100%;
  margin-inline: auto;
}

.entry-content blockquote {
  padding: clamp(1rem, 3vw, 2rem);
  margin-inline: 0;
}

.entry-content ul,
.entry-content ol {
  padding-left: 1.4em;
}

.entry-content li + li {
  margin-top: 0.4em;
}

/* =========================================================
   MEDICAL ARTICLE RESPONSIVE
========================================================= */

.rx-medical-article {
  max-width: var(--rx-content-width);
  margin-inline: auto;
}

.rx-medical-summary,
.rx-medical-box,
.rx-clinical-note,
.rx-warning-box,
.rx-info-box {
  padding: clamp(1rem, 3vw, 2rem);
  border-radius: var(--rx-radius-lg);
  margin-block: var(--rx-space-6);
}

.rx-medical-toc,
.rx-table-of-contents {
  padding: var(--rx-space-4);
  overflow-x: auto;
}

.rx-medical-toc ul,
.rx-table-of-contents ul {
  padding-left: 1.2rem;
}

.rx-medical-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.rx-medical-table-wrap table {
  min-width: 700px;
}

/* =========================================================
   RESPONSIVE IMAGES
========================================================= */

.rx-img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.rx-img-contain {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.rx-aspect-video {
  aspect-ratio: 16 / 9;
}

.rx-aspect-square {
  aspect-ratio: 1 / 1;
}

.rx-aspect-photo {
  aspect-ratio: 4 / 3;
}

.rx-aspect-wide {
  aspect-ratio: 21 / 9;
}

.rx-responsive-media {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.rx-responsive-media iframe,
.rx-responsive-media video,
.rx-responsive-media embed,
.rx-responsive-media object {
  width: 100%;
  aspect-ratio: 16 / 9;
}

/* =========================================================
   FORMS RESPONSIVE
========================================================= */

form,
.rx-form {
  max-width: 100%;
}

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

input[type="text"],
input[type="email"],
input[type="url"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"],
input[type="date"],
input[type="datetime-local"],
select,
textarea {
  width: 100%;
  min-height: 44px;
}

button,
input[type="button"],
input[type="submit"],
input[type="reset"],
.rx-button,
.button,
.wp-block-button__link {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.rx-button-group,
.wp-block-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-space-3);
}

/* =========================================================
   SEARCH RESPONSIVE
========================================================= */

.rx-search-form,
.search-form {
  display: flex;
  width: 100%;
  gap: var(--rx-space-2);
}

.rx-search-form input[type="search"],
.search-form input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
}

.rx-search-form button,
.search-form button {
  flex: 0 0 auto;
}

/* =========================================================
   COMMENT RESPONSIVE
========================================================= */

.comments-area {
  max-width: var(--rx-content-width);
  margin-inline: auto;
}

.comment-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.comment {
  overflow-wrap: break-word;
}

.comment-body {
  padding: clamp(1rem, 3vw, 1.5rem);
}

.comment-author {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--rx-space-2);
}

.comment-author .avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.comment-list .children {
  list-style: none;
  margin-left: 0;
  padding-left: var(--rx-space-4);
}

/* =========================================================
   PAGINATION RESPONSIVE
========================================================= */

.pagination,
.nav-links,
.page-links,
.rx-pagination {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-space-2);
  align-items: center;
  justify-content: center;
}

.pagination a,
.pagination span,
.nav-links a,
.nav-links span,
.page-links a,
.page-links span,
.rx-pagination a,
.rx-pagination span {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* =========================================================
   FOOTER RESPONSIVE
========================================================= */

.site-footer,
.rx-site-footer {
  padding-block: clamp(2rem, 5vw, 5rem);
}

.rx-footer-grid,
.footer-widgets,
.site-footer-widgets {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--rx-space-8);
}

.rx-footer-bottom,
.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--rx-space-4);
  align-items: flex-start;
}

.rx-footer-menu,
.footer-menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rx-space-3);
  list-style: none;
  padding: 0;
  margin: 0;
}

/* =========================================================
   RESPONSIVE TABLES
========================================================= */

.rx-table-responsive,
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.rx-table-responsive table,
.table-responsive table {
  min-width: 640px;
}

.rx-table-stack {
  width: 100%;
}

@media (max-width: 575.98px) {
  .rx-table-stack,
  .rx-table-stack thead,
  .rx-table-stack tbody,
  .rx-table-stack th,
  .rx-table-stack td,
  .rx-table-stack tr {
    display: block;
  }

  .rx-table-stack thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .rx-table-stack tr {
    margin-block-end: var(--rx-space-4);
  }

  .rx-table-stack td {
    display: flex;
    justify-content: space-between;
    gap: var(--rx-space-4);
  }

  .rx-table-stack td::before {
    content: attr(data-label);
    font-weight: 700;
  }
}

/* =========================================================
   MOBILE UTILITIES
========================================================= */

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

.rx-show-mobile {
  display: initial !important;
}

.rx-mobile-center {
  text-align: center;
}

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

.rx-mobile-stack {
  display: flex;
  flex-direction: column;
}

.rx-mobile-scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* =========================================================
   ACCESSIBILITY RESPONSIVE
========================================================= */

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  z-index: 100000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  padding: 0.75rem 1rem;
}

:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}

/* =========================================================
   EXTRA SMALL DEVICES
   320px - 374px
========================================================= */

@media (max-width: 374.98px) {
  :root {
    --rx-gutter-xs: 0.875rem;
  }

  body {
    font-size: 0.95rem;
  }

  .rx-container,
  .container,
  .site-container,
  .wrap,
  .rx-container-narrow,
  .rx-container-wide,
  .rx-container-fluid {
    padding-inline: 0.875rem;
  }

  .rx-hero-title,
  .hero-title {
    font-size: clamp(1.9rem, 14vw, 2.6rem);
  }

  .primary-menu.is-open,
  .rx-primary-menu.is-open {
    padding: 0.875rem;
  }

  .rx-button-group,
  .wp-block-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .rx-button,
  .button,
  .wp-block-button,
  .wp-block-button__link {
    width: 100%;
  }
}

/* =========================================================
   SMALL DEVICES
   375px - 575px
========================================================= */

@media (min-width: 375px) {
  .rx-container,
  .container,
  .site-container,
  .wrap,
  .rx-container-narrow,
  .rx-container-wide,
  .rx-container-fluid {
    padding-inline: var(--rx-gutter-sm);
  }

  .gallery-columns-2,
  .gallery-columns-3,
  .gallery-columns-4,
  .gallery-columns-5,
  .gallery-columns-6,
  .gallery-columns-7,
  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =========================================================
   SMALL TABLET
   576px+
========================================================= */

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

  .rx-container-narrow,
  .rx-container-wide,
  .rx-container-fluid {
    padding-inline: var(--rx-gutter-md);
  }

  .rx-grid-2,
  .rx-grid-3,
  .rx-grid-4,
  .rx-grid-5,
  .rx-grid-6 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rx-post-grid,
  .blog-grid,
  .archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rx-form-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rx-footer-bottom,
  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

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

  .rx-show-sm-up {
    display: initial !important;
  }

  .rx-sm-text-left {
    text-align: left;
  }

  .rx-sm-text-center {
    text-align: center;
  }

  .rx-sm-text-right {
    text-align: right;
  }

  .gallery-columns-3,
  .gallery-columns-4,
  .gallery-columns-5,
  .gallery-columns-6,
  .gallery-columns-7,
  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* =========================================================
   TABLET
   768px+
========================================================= */

@media (min-width: 768px) {
  :root {
    --rx-gutter-xs: var(--rx-gutter-md);
  }

  .rx-container,
  .container,
  .site-container,
  .wrap {
    max-width: var(--rx-container-md);
    padding-inline: var(--rx-gutter-md);
  }

  .site-header,
  .rx-site-header,
  .rx-header-inner,
  .site-header-inner {
    min-height: var(--rx-header-height-tablet);
  }

  .primary-menu.is-open,
  .rx-primary-menu.is-open,
  .main-navigation.toggled ul,
  .rx-main-navigation.toggled ul {
    inset-block-start: var(--rx-header-height-tablet);
  }

  .rx-grid-3,
  .rx-grid-4,
  .rx-grid-5,
  .rx-grid-6 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .rx-footer-grid,
  .footer-widgets,
  .site-footer-widgets {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .wp-block-media-text {
    display: grid;
    grid-template-columns: 50% 1fr;
  }

  .wp-block-media-text.has-media-on-the-right {
    grid-template-columns: 1fr 50%;
  }

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

  .rx-show-md-up {
    display: initial !important;
  }

  .rx-md-flex-row {
    flex-direction: row;
  }

  .rx-md-flex-column {
    flex-direction: column;
  }

  .rx-md-text-left {
    text-align: left;
  }

  .rx-md-text-center {
    text-align: center;
  }

  .rx-md-text-right {
    text-align: right;
  }

  .gallery-columns-4,
  .gallery-columns-5,
  .gallery-columns-6,
  .gallery-columns-7,
  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* =========================================================
   WORDPRESS ADMIN BAR FIX
========================================================= */

@media (min-width: 783px) {
  .admin-bar .rx-sticky-header,
  .admin-bar .site-header.is-sticky {
    top: 32px;
  }
}

/* =========================================================
   SMALL DESKTOP
   992px+
========================================================= */

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

  .rx-header-inner,
  .site-header-inner {
    gap: var(--rx-space-8);
  }

  .rx-menu-toggle,
  .menu-toggle {
    display: none;
  }

  .primary-menu,
  .rx-primary-menu,
  .main-navigation ul,
  .rx-main-navigation ul {
    display: flex;
    align-items: center;
    gap: 0.25rem;
  }

  .primary-menu.is-open,
  .rx-primary-menu.is-open,
  .main-navigation.toggled ul,
  .rx-main-navigation.toggled ul {
    position: static;
    inset: auto;
    z-index: auto;
    overflow: visible;
    padding: 0;
    flex-direction: row;
  }

  .primary-menu .sub-menu,
  .rx-primary-menu .sub-menu,
  .main-navigation .sub-menu,
  .rx-main-navigation .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    padding: 0.5rem 0;
    z-index: var(--rx-z-overlay);
  }

  .primary-menu .sub-menu .sub-menu,
  .rx-primary-menu .sub-menu .sub-menu,
  .main-navigation .sub-menu .sub-menu,
  .rx-main-navigation .sub-menu .sub-menu {
    top: 0;
    left: 100%;
  }

  .site-header,
  .rx-site-header,
  .rx-header-inner,
  .site-header-inner {
    min-height: var(--rx-header-height-desktop);
  }

  .rx-layout.content-sidebar,
  .content-sidebar {
    grid-template-columns: minmax(0, 1fr) var(--rx-sidebar-width);
  }

  .rx-layout.sidebar-content,
  .sidebar-content {
    grid-template-columns: var(--rx-sidebar-width) minmax(0, 1fr);
  }

  .rx-grid-4,
  .rx-grid-5,
  .rx-grid-6 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .rx-post-grid,
  .blog-grid,
  .archive-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .rx-footer-grid,
  .footer-widgets,
  .site-footer-widgets {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .rx-show-lg-up {
    display: initial !important;
  }

  .rx-lg-text-left {
    text-align: left;
  }

  .rx-lg-text-center {
    text-align: center;
  }

  .rx-lg-text-right {
    text-align: right;
  }

  .gallery-columns-5,
  .gallery-columns-6,
  .gallery-columns-7,
  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* =========================================================
   LARGE DESKTOP
   1200px+
========================================================= */

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

  .rx-grid-5,
  .rx-grid-6 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .rx-post-grid.rx-post-grid-4,
  .blog-grid.blog-grid-4,
  .archive-grid.archive-grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .rx-layout.content-sidebar,
  .content-sidebar {
    grid-template-columns: minmax(0, 1fr) minmax(280px, var(--rx-sidebar-width));
  }

  .rx-layout.sidebar-content,
  .sidebar-content {
    grid-template-columns: minmax(280px, var(--rx-sidebar-width)) minmax(0, 1fr);
  }

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

  .rx-show-xl-up {
    display: initial !important;
  }

  .gallery-columns-6,
  .gallery-columns-7,
  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* =========================================================
   EXTRA LARGE DESKTOP
   1400px+
========================================================= */

@media (min-width: 1400px) {
  .rx-container,
  .container,
  .site-container,
  .wrap {
    max-width: var(--rx-container-2xl);
  }

  .rx-container-3xl {
    max-width: var(--rx-container-3xl);
  }

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

  .rx-hide-2xl-up {
    display: none !important;
  }

  .rx-show-2xl-up {
    display: initial !important;
  }

  .gallery-columns-7,
  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(7, 1fr);
  }
}

/* =========================================================
   ULTRA WIDE SCREEN
   1600px+
========================================================= */

@media (min-width: 1600px) {
  :root {
    --rx-container-3xl: 1520px;
  }

  .rx-ultra-wide {
    max-width: 1520px;
    margin-inline: auto;
  }

  .rx-hero,
  .hero,
  .site-hero {
    min-height: min(82vh, 900px);
  }

  .gallery-columns-8,
  .gallery-columns-9 {
    grid-template-columns: repeat(8, 1fr);
  }
}

/* =========================================================
   HUGE SCREEN
   1920px+
========================================================= */

@media (min-width: 1920px) {
  :root {
    --rx-container-3xl: 1640px;
  }

  .rx-huge-container {
    max-width: 1640px;
    margin-inline: auto;
  }

  .rx-hero-title,
  .hero-title {
    max-width: 14ch;
  }

  .gallery-columns-9 {
    grid-template-columns: repeat(9, 1fr);
  }
}

/* =========================================================
   LANDSCAPE MOBILE
========================================================= */

@media (max-height: 500px) and (orientation: landscape) {
  .rx-hero,
  .hero,
  .site-hero {
    min-height: auto;
    padding-block: 2rem;
  }

  .primary-menu.is-open,
  .rx-primary-menu.is-open,
  .main-navigation.toggled ul,
  .rx-main-navigation.toggled ul {
    inset-block-start: 0;
    padding-top: var(--rx-space-4);
  }
}

/* =========================================================
   TOUCH DEVICE IMPROVEMENTS
========================================================= */

@media (hover: none) and (pointer: coarse) {
  a,
  button,
  input,
  select,
  textarea,
  .rx-button,
  .button {
    min-height: 44px;
  }

  .primary-menu a,
  .rx-primary-menu a {
    padding-block: 1rem;
  }

  .rx-hover-card:hover {
    transform: none;
  }
}

/* =========================================================
   HOVER DEVICE IMPROVEMENTS
========================================================= */

@media (hover: hover) and (pointer: fine) {
  .rx-hover-lift {
    transition: transform 0.25s ease;
  }

  .rx-hover-lift:hover {
    transform: translateY(-4px);
  }
}

/* =========================================================
   PRINT RESPONSIVE
========================================================= */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  html,
  body {
    width: 100%;
    min-width: 0;
    overflow: visible;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  a {
    text-decoration: underline;
  }

  img {
    max-width: 100% !important;
    page-break-inside: avoid;
  }

  table,
  blockquote,
  pre,
  figure {
    page-break-inside: avoid;
  }

  h1,
  h2,
  h3,
  h4 {
    page-break-after: avoid;
  }

  .site-header,
  .rx-site-header,
  .site-footer,
  .rx-site-footer,
  .sidebar,
  .rx-sidebar,
  .widget-area,
  .main-navigation,
  .rx-main-navigation,
  .rx-menu-toggle,
  .menu-toggle,
  .comments-area,
  .rx-no-print {
    display: none !important;
  }

  .rx-container,
  .container,
  .site-container,
  .wrap,
  .entry-content,
  .single .entry-content,
  .page .entry-content {
    max-width: none !important;
    padding: 0 !important;
    margin: 0 !important;
  }
}

Then enqueue it in your RX Theme functions.php or inc/core/enqueue.php:

function rx_theme_enqueue_responsive_css() {
    wp_enqueue_style(
        'rx-responsive',
        get_template_directory_uri() . '/assets/css/rx-responsive.css',
        array(),
        wp_get_theme()->get('Version'),
        'all'
    );
}
add_action( 'wp_enqueue_scripts', 'rx_theme_enqueue_responsive_css' );

Best loading order for RX Theme CSS:

assets/css/rx-reset.css
assets/css/rx-variables.css
assets/css/rx-base.css
assets/css/rx-layout.css
assets/css/rx-components.css
assets/css/rx-responsive.css
assets/css/rx-dynamic.css

rx-responsive.css should load near the end, because responsive rules often override earlier layout and component styles.

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