left-sidebar.css

harun.bspt2014@gmail.com

I’ll build this as a production-ready left-sidebar.css for RX Theme: static CSS only, using theme variables, accessibility states, responsive behavior, sticky sidebar, widgets, navigation, TOC, author/card blocks, ads, dark-mode compatibility, and print handling.

Friend, create this file:

assets/css/static-css/left-sidebar.css

Then paste the full code below.

/*!
 * RX Theme - Left Sidebar Static CSS
 * File: assets/css/static-css/left-sidebar.css
 * Purpose: Advanced left sidebar styling for widgets, navigation, TOC, author box,
 * ads, categories, search, newsletter, sticky sidebar, responsive layout, RTL,
 * dark mode, accessibility, and print optimization.
 */

/* =========================================================
   01. Sidebar Design Tokens
   ========================================================= */

:root {
  --rx-left-sidebar-width: 320px;
  --rx-left-sidebar-min-width: 260px;
  --rx-left-sidebar-max-width: 360px;

  --rx-left-sidebar-gap: var(--rx-space-6, 1.5rem);
  --rx-left-sidebar-inner-gap: var(--rx-space-4, 1rem);

  --rx-left-sidebar-bg: var(--rx-surface, #ffffff);
  --rx-left-sidebar-bg-soft: var(--rx-surface-soft, #f8fafc);
  --rx-left-sidebar-bg-muted: var(--rx-surface-muted, #f1f5f9);

  --rx-left-sidebar-text: var(--rx-text, #111827);
  --rx-left-sidebar-text-muted: var(--rx-text-muted, #64748b);
  --rx-left-sidebar-heading: var(--rx-heading, #0f172a);

  --rx-left-sidebar-border: var(--rx-border, #e5e7eb);
  --rx-left-sidebar-border-strong: var(--rx-border-strong, #cbd5e1);

  --rx-left-sidebar-link: var(--rx-link, #0f766e);
  --rx-left-sidebar-link-hover: var(--rx-link-hover, #115e59);

  --rx-left-sidebar-accent: var(--rx-primary, #0f766e);
  --rx-left-sidebar-accent-soft: color-mix(in srgb, var(--rx-left-sidebar-accent) 12%, transparent);

  --rx-left-sidebar-radius: var(--rx-radius-lg, 16px);
  --rx-left-sidebar-radius-sm: var(--rx-radius-md, 10px);

  --rx-left-sidebar-shadow: var(--rx-shadow-sm, 0 1px 3px rgba(15, 23, 42, 0.08));
  --rx-left-sidebar-shadow-hover: var(--rx-shadow-md, 0 8px 24px rgba(15, 23, 42, 0.12));

  --rx-left-sidebar-font-size: var(--rx-font-size-sm, 0.9375rem);
  --rx-left-sidebar-line-height: 1.65;

  --rx-left-sidebar-title-size: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --rx-left-sidebar-title-weight: 700;

  --rx-left-sidebar-sticky-top: calc(var(--rx-header-height, 80px) + 24px);
  --rx-left-sidebar-z-index: 5;

  --rx-left-sidebar-transition: 180ms ease;
}

/* =========================================================
   02. Main Sidebar Area
   ========================================================= */

.rx-left-sidebar,
#rx-left-sidebar,
.left-sidebar,
.sidebar-left {
  inline-size: min(100%, var(--rx-left-sidebar-width));
  min-inline-size: 0;
  max-inline-size: var(--rx-left-sidebar-max-width);
  color: var(--rx-left-sidebar-text);
  font-size: var(--rx-left-sidebar-font-size);
  line-height: var(--rx-left-sidebar-line-height);
  overflow-wrap: break-word;
  word-break: normal;
}

.rx-left-sidebar * {
  box-sizing: border-box;
}

.rx-left-sidebar img,
.rx-left-sidebar video,
.rx-left-sidebar iframe,
.rx-left-sidebar embed,
.rx-left-sidebar object {
  max-inline-size: 100%;
}

.rx-left-sidebar img {
  block-size: auto;
  border-radius: var(--rx-left-sidebar-radius-sm);
}

.rx-left-sidebar iframe {
  border: 0;
  border-radius: var(--rx-left-sidebar-radius-sm);
}

.rx-left-sidebar :where(a) {
  color: var(--rx-left-sidebar-link);
  text-decoration: none;
  text-underline-offset: 0.2em;
  transition:
    color var(--rx-left-sidebar-transition),
    background-color var(--rx-left-sidebar-transition),
    border-color var(--rx-left-sidebar-transition),
    box-shadow var(--rx-left-sidebar-transition),
    transform var(--rx-left-sidebar-transition);
}

.rx-left-sidebar :where(a:hover) {
  color: var(--rx-left-sidebar-link-hover);
  text-decoration: underline;
}

.rx-left-sidebar :where(a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible) {
  outline: 3px solid color-mix(in srgb, var(--rx-left-sidebar-accent) 45%, transparent);
  outline-offset: 3px;
  border-radius: 8px;
}

/* =========================================================
   03. Sidebar Layout Helpers
   ========================================================= */

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

.rx-layout-has-left-sidebar.rx-layout-three-columns {
  grid-template-columns:
    minmax(var(--rx-left-sidebar-min-width), var(--rx-left-sidebar-width))
    minmax(0, 1fr)
    minmax(var(--rx-right-sidebar-min-width, 260px), var(--rx-right-sidebar-width, 320px));
}

.rx-left-sidebar-area {
  min-inline-size: 0;
}

.rx-left-sidebar-inner {
  display: flex;
  flex-direction: column;
  gap: var(--rx-left-sidebar-inner-gap);
}

.rx-left-sidebar-sticky {
  position: sticky;
  inset-block-start: var(--rx-left-sidebar-sticky-top);
  z-index: var(--rx-left-sidebar-z-index);
}

.admin-bar .rx-left-sidebar-sticky {
  inset-block-start: calc(var(--rx-left-sidebar-sticky-top) + 32px);
}

@media (max-width: 782px) {
  .admin-bar .rx-left-sidebar-sticky {
    inset-block-start: calc(var(--rx-left-sidebar-sticky-top) + 46px);
  }
}

/* =========================================================
   04. Widget Base Design
   ========================================================= */

.rx-left-sidebar .widget,
.rx-left-sidebar .rx-widget,
.rx-left-sidebar .wp-block-group,
.rx-left-sidebar .wp-block-search,
.rx-left-sidebar .rx-sidebar-box {
  position: relative;
  padding: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
  background: var(--rx-left-sidebar-bg);
  border: 1px solid var(--rx-left-sidebar-border);
  border-radius: var(--rx-left-sidebar-radius);
  box-shadow: var(--rx-left-sidebar-shadow);
}

.rx-left-sidebar .widget + .widget,
.rx-left-sidebar .rx-widget + .rx-widget,
.rx-left-sidebar .rx-sidebar-box + .rx-sidebar-box {
  margin-block-start: var(--rx-left-sidebar-inner-gap);
}

.rx-left-sidebar .widget:hover,
.rx-left-sidebar .rx-widget:hover,
.rx-left-sidebar .rx-sidebar-box:hover {
  border-color: color-mix(in srgb, var(--rx-left-sidebar-accent) 22%, var(--rx-left-sidebar-border));
  box-shadow: var(--rx-left-sidebar-shadow-hover);
}

.rx-left-sidebar .widget-title,
.rx-left-sidebar .rx-widget-title,
.rx-left-sidebar .wp-block-heading,
.rx-left-sidebar h2,
.rx-left-sidebar h3 {
  margin: 0 0 0.875rem;
  color: var(--rx-left-sidebar-heading);
  font-size: var(--rx-left-sidebar-title-size);
  font-weight: var(--rx-left-sidebar-title-weight);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.rx-left-sidebar .widget-title::after,
.rx-left-sidebar .rx-widget-title::after {
  content: "";
  display: block;
  inline-size: 42px;
  block-size: 3px;
  margin-block-start: 0.5rem;
  background: var(--rx-left-sidebar-accent);
  border-radius: 999px;
}

.rx-left-sidebar .widget p,
.rx-left-sidebar .rx-widget p {
  margin-block: 0 0.875rem;
  color: var(--rx-left-sidebar-text-muted);
}

.rx-left-sidebar .widget p:last-child,
.rx-left-sidebar .rx-widget p:last-child {
  margin-block-end: 0;
}

/* =========================================================
   05. Sidebar Lists
   ========================================================= */

.rx-left-sidebar :where(ul, ol) {
  margin: 0;
  padding: 0;
  list-style: none;
}

.rx-left-sidebar .widget :where(ul, ol),
.rx-left-sidebar .rx-widget :where(ul, ol) {
  display: grid;
  gap: 0.5rem;
}

.rx-left-sidebar .widget li,
.rx-left-sidebar .rx-widget li {
  position: relative;
  min-inline-size: 0;
  color: var(--rx-left-sidebar-text-muted);
}

.rx-left-sidebar .widget li a,
.rx-left-sidebar .rx-widget li a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  max-inline-size: 100%;
  color: var(--rx-left-sidebar-text);
  font-weight: 500;
}

.rx-left-sidebar .widget li a:hover,
.rx-left-sidebar .rx-widget li a:hover {
  color: var(--rx-left-sidebar-link-hover);
}

.rx-left-sidebar .widget li a::before,
.rx-left-sidebar .rx-widget li a::before {
  content: "";
  flex: 0 0 auto;
  inline-size: 7px;
  block-size: 7px;
  background: var(--rx-left-sidebar-accent);
  border-radius: 999px;
  opacity: 0.7;
}

.rx-left-sidebar .children,
.rx-left-sidebar .sub-menu {
  margin-block-start: 0.5rem;
  margin-inline-start: 1rem;
  padding-inline-start: 0.75rem;
  border-inline-start: 1px solid var(--rx-left-sidebar-border);
}

/* =========================================================
   06. Sidebar Navigation Menu
   ========================================================= */

.rx-left-sidebar .rx-sidebar-menu,
.rx-left-sidebar .menu,
.rx-left-sidebar .wp-block-navigation__container {
  display: grid;
  gap: 0.35rem;
}

.rx-left-sidebar .rx-sidebar-menu a,
.rx-left-sidebar .menu a,
.rx-left-sidebar .wp-block-navigation-item__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-block-size: 42px;
  padding: 0.65rem 0.8rem;
  color: var(--rx-left-sidebar-text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--rx-left-sidebar-radius-sm);
  font-weight: 600;
  text-decoration: none;
}

.rx-left-sidebar .rx-sidebar-menu a:hover,
.rx-left-sidebar .menu a:hover,
.rx-left-sidebar .wp-block-navigation-item__content:hover {
  color: var(--rx-left-sidebar-link-hover);
  background: var(--rx-left-sidebar-accent-soft);
  border-color: color-mix(in srgb, var(--rx-left-sidebar-accent) 18%, transparent);
  text-decoration: none;
}

.rx-left-sidebar .rx-sidebar-menu .current-menu-item > a,
.rx-left-sidebar .rx-sidebar-menu .current_page_item > a,
.rx-left-sidebar .menu .current-menu-item > a,
.rx-left-sidebar .menu .current_page_item > a {
  color: var(--rx-left-sidebar-link-hover);
  background: var(--rx-left-sidebar-accent-soft);
  border-color: color-mix(in srgb, var(--rx-left-sidebar-accent) 28%, transparent);
}

.rx-left-sidebar .rx-sidebar-menu .menu-item-has-children > a::after,
.rx-left-sidebar .menu .menu-item-has-children > a::after {
  content: "›";
  font-size: 1.2em;
  line-height: 1;
  opacity: 0.65;
}

/* =========================================================
   07. Search Widget
   ========================================================= */

.rx-left-sidebar .search-form,
.rx-left-sidebar .wp-block-search__inside-wrapper,
.rx-left-sidebar .rx-sidebar-search {
  display: flex;
  gap: 0.5rem;
  inline-size: 100%;
}

.rx-left-sidebar .search-field,
.rx-left-sidebar .wp-block-search__input,
.rx-left-sidebar .rx-sidebar-search-input {
  inline-size: 100%;
  min-inline-size: 0;
  min-block-size: 44px;
  padding: 0.7rem 0.85rem;
  color: var(--rx-left-sidebar-text);
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px solid var(--rx-left-sidebar-border);
  border-radius: var(--rx-left-sidebar-radius-sm);
  font: inherit;
}

.rx-left-sidebar .search-field::placeholder,
.rx-left-sidebar .wp-block-search__input::placeholder,
.rx-left-sidebar .rx-sidebar-search-input::placeholder {
  color: color-mix(in srgb, var(--rx-left-sidebar-text-muted) 80%, transparent);
}

.rx-left-sidebar .search-submit,
.rx-left-sidebar .wp-block-search__button,
.rx-left-sidebar .rx-sidebar-search-button {
  flex: 0 0 auto;
  min-block-size: 44px;
  padding: 0.7rem 0.95rem;
  color: #ffffff;
  background: var(--rx-left-sidebar-accent);
  border: 1px solid var(--rx-left-sidebar-accent);
  border-radius: var(--rx-left-sidebar-radius-sm);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform var(--rx-left-sidebar-transition),
    filter var(--rx-left-sidebar-transition),
    box-shadow var(--rx-left-sidebar-transition);
}

.rx-left-sidebar .search-submit:hover,
.rx-left-sidebar .wp-block-search__button:hover,
.rx-left-sidebar .rx-sidebar-search-button:hover {
  filter: brightness(0.95);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--rx-left-sidebar-accent) 28%, transparent);
  transform: translateY(-1px);
}

/* =========================================================
   08. Recent Posts / Popular Posts
   ========================================================= */

.rx-left-sidebar .rx-post-list,
.rx-left-sidebar .rx-recent-posts,
.rx-left-sidebar .rx-popular-posts {
  display: grid;
  gap: 0.85rem;
}

.rx-left-sidebar .rx-post-card-mini {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 0.75rem;
  align-items: start;
  padding-block: 0.25rem;
}

.rx-left-sidebar .rx-post-card-mini:not(:last-child) {
  padding-block-end: 0.85rem;
  border-block-end: 1px solid var(--rx-left-sidebar-border);
}

.rx-left-sidebar .rx-post-card-mini-thumb {
  position: relative;
  overflow: hidden;
  inline-size: 72px;
  aspect-ratio: 1 / 0.78;
  background: var(--rx-left-sidebar-bg-muted);
  border-radius: var(--rx-left-sidebar-radius-sm);
}

.rx-left-sidebar .rx-post-card-mini-thumb img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  transition: transform 260ms ease;
}

.rx-left-sidebar .rx-post-card-mini:hover .rx-post-card-mini-thumb img {
  transform: scale(1.05);
}

.rx-left-sidebar .rx-post-card-mini-title {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: var(--rx-left-sidebar-heading);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.rx-left-sidebar .rx-post-card-mini-title a {
  color: inherit;
}

.rx-left-sidebar .rx-post-card-mini-title a:hover {
  color: var(--rx-left-sidebar-link-hover);
}

.rx-left-sidebar .rx-post-card-mini-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  margin-block-start: 0.35rem;
  color: var(--rx-left-sidebar-text-muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

/* =========================================================
   09. Category Widget
   ========================================================= */

.rx-left-sidebar .cat-item,
.rx-left-sidebar .rx-category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.rx-left-sidebar .cat-item a,
.rx-left-sidebar .rx-category-item a {
  min-inline-size: 0;
}

.rx-left-sidebar .cat-count,
.rx-left-sidebar .rx-category-count,
.rx-left-sidebar .post-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: 1.75rem;
  min-block-size: 1.5rem;
  padding: 0.1rem 0.45rem;
  color: var(--rx-left-sidebar-accent);
  background: var(--rx-left-sidebar-accent-soft);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}

/* =========================================================
   10. Tag Cloud
   ========================================================= */

.rx-left-sidebar .tagcloud,
.rx-left-sidebar .wp-block-tag-cloud,
.rx-left-sidebar .rx-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.rx-left-sidebar .tagcloud a,
.rx-left-sidebar .wp-block-tag-cloud a,
.rx-left-sidebar .rx-tag-cloud a {
  display: inline-flex;
  align-items: center;
  min-block-size: 32px;
  padding: 0.35rem 0.7rem;
  color: var(--rx-left-sidebar-text);
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px solid var(--rx-left-sidebar-border);
  border-radius: 999px;
  font-size: 0.8125rem !important;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
}

.rx-left-sidebar .tagcloud a:hover,
.rx-left-sidebar .wp-block-tag-cloud a:hover,
.rx-left-sidebar .rx-tag-cloud a:hover {
  color: var(--rx-left-sidebar-link-hover);
  background: var(--rx-left-sidebar-accent-soft);
  border-color: color-mix(in srgb, var(--rx-left-sidebar-accent) 35%, var(--rx-left-sidebar-border));
  text-decoration: none;
}

/* =========================================================
   11. Table of Contents Sidebar
   ========================================================= */

.rx-left-sidebar .rx-toc,
.rx-left-sidebar .rx-sidebar-toc {
  counter-reset: rx-toc-counter;
}

.rx-left-sidebar .rx-toc-list {
  display: grid;
  gap: 0.35rem;
}

.rx-left-sidebar .rx-toc-list a {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.55rem;
  align-items: start;
  padding: 0.55rem 0.65rem;
  color: var(--rx-left-sidebar-text);
  background: transparent;
  border-radius: var(--rx-left-sidebar-radius-sm);
  font-weight: 600;
  line-height: 1.45;
  text-decoration: none;
}

.rx-left-sidebar .rx-toc-list a::before {
  counter-increment: rx-toc-counter;
  content: counter(rx-toc-counter);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 1.45rem;
  block-size: 1.45rem;
  color: var(--rx-left-sidebar-accent);
  background: var(--rx-left-sidebar-accent-soft);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
}

.rx-left-sidebar .rx-toc-list a:hover,
.rx-left-sidebar .rx-toc-list a[aria-current="true"],
.rx-left-sidebar .rx-toc-list a.is-active {
  color: var(--rx-left-sidebar-link-hover);
  background: var(--rx-left-sidebar-accent-soft);
  text-decoration: none;
}

/* =========================================================
   12. Author / Doctor Profile Box
   ========================================================= */

.rx-left-sidebar .rx-author-box,
.rx-left-sidebar .rx-doctor-box,
.rx-left-sidebar .rx-profile-box {
  text-align: center;
}

.rx-left-sidebar .rx-author-avatar,
.rx-left-sidebar .rx-doctor-avatar,
.rx-left-sidebar .rx-profile-avatar {
  inline-size: 96px;
  block-size: 96px;
  margin-inline: auto;
  margin-block-end: 0.8rem;
  overflow: hidden;
  background: var(--rx-left-sidebar-bg-muted);
  border: 4px solid var(--rx-left-sidebar-bg);
  border-radius: 999px;
  box-shadow: 0 0 0 1px var(--rx-left-sidebar-border);
}

.rx-left-sidebar .rx-author-avatar img,
.rx-left-sidebar .rx-doctor-avatar img,
.rx-left-sidebar .rx-profile-avatar img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.rx-left-sidebar .rx-author-name,
.rx-left-sidebar .rx-doctor-name,
.rx-left-sidebar .rx-profile-name {
  margin: 0;
  color: var(--rx-left-sidebar-heading);
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.35;
}

.rx-left-sidebar .rx-author-role,
.rx-left-sidebar .rx-doctor-role,
.rx-left-sidebar .rx-profile-role {
  margin-block-start: 0.25rem;
  color: var(--rx-left-sidebar-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.rx-left-sidebar .rx-author-bio,
.rx-left-sidebar .rx-doctor-bio,
.rx-left-sidebar .rx-profile-bio {
  margin-block-start: 0.75rem;
  color: var(--rx-left-sidebar-text-muted);
  font-size: 0.9rem;
}

/* =========================================================
   13. Social Links
   ========================================================= */

.rx-left-sidebar .rx-social-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-block-start: 0.9rem;
}

.rx-left-sidebar .rx-social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 38px;
  block-size: 38px;
  color: var(--rx-left-sidebar-text);
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px solid var(--rx-left-sidebar-border);
  border-radius: 999px;
  text-decoration: none;
}

.rx-left-sidebar .rx-social-link:hover {
  color: #ffffff;
  background: var(--rx-left-sidebar-accent);
  border-color: var(--rx-left-sidebar-accent);
  text-decoration: none;
  transform: translateY(-2px);
}

/* =========================================================
   14. Newsletter / CTA Box
   ========================================================= */

.rx-left-sidebar .rx-newsletter-box,
.rx-left-sidebar .rx-cta-box {
  background:
    radial-gradient(circle at top right, color-mix(in srgb, var(--rx-left-sidebar-accent) 18%, transparent), transparent 38%),
    var(--rx-left-sidebar-bg);
}

.rx-left-sidebar .rx-newsletter-form {
  display: grid;
  gap: 0.65rem;
  margin-block-start: 0.85rem;
}

.rx-left-sidebar .rx-newsletter-input {
  min-block-size: 44px;
  padding: 0.75rem 0.85rem;
  color: var(--rx-left-sidebar-text);
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px solid var(--rx-left-sidebar-border);
  border-radius: var(--rx-left-sidebar-radius-sm);
  font: inherit;
}

.rx-left-sidebar .rx-newsletter-button,
.rx-left-sidebar .rx-cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 44px;
  padding: 0.75rem 1rem;
  color: #ffffff;
  background: var(--rx-left-sidebar-accent);
  border: 1px solid var(--rx-left-sidebar-accent);
  border-radius: var(--rx-left-sidebar-radius-sm);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
}

.rx-left-sidebar .rx-newsletter-button:hover,
.rx-left-sidebar .rx-cta-button:hover {
  color: #ffffff;
  filter: brightness(0.95);
  text-decoration: none;
  transform: translateY(-1px);
}

/* =========================================================
   15. Advertisement Box
   ========================================================= */

.rx-left-sidebar .rx-sidebar-ad,
.rx-left-sidebar .rx-ad-box {
  overflow: hidden;
  padding: 0.75rem;
  text-align: center;
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px dashed var(--rx-left-sidebar-border-strong);
  border-radius: var(--rx-left-sidebar-radius);
}

.rx-left-sidebar .rx-sidebar-ad-label,
.rx-left-sidebar .rx-ad-label {
  display: block;
  margin-block-end: 0.5rem;
  color: var(--rx-left-sidebar-text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rx-left-sidebar .rx-sidebar-ad img,
.rx-left-sidebar .rx-ad-box img {
  display: block;
  inline-size: 100%;
  border-radius: var(--rx-left-sidebar-radius-sm);
}

/* =========================================================
   16. Medical Info / Disclaimer Box
   ========================================================= */

.rx-left-sidebar .rx-medical-note,
.rx-left-sidebar .rx-disclaimer-box {
  background: color-mix(in srgb, #fef3c7 40%, var(--rx-left-sidebar-bg));
  border-color: color-mix(in srgb, #f59e0b 35%, var(--rx-left-sidebar-border));
}

.rx-left-sidebar .rx-medical-note-title,
.rx-left-sidebar .rx-disclaimer-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.6rem;
  color: #92400e;
  font-size: 0.95rem;
  font-weight: 800;
}

.rx-left-sidebar .rx-medical-note p,
.rx-left-sidebar .rx-disclaimer-box p {
  color: #78350f;
  font-size: 0.88rem;
}

/* =========================================================
   17. Login / Account Widget
   ========================================================= */

.rx-left-sidebar .rx-account-links {
  display: grid;
  gap: 0.55rem;
}

.rx-left-sidebar .rx-account-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-block-size: 42px;
  padding: 0.65rem 0.75rem;
  color: var(--rx-left-sidebar-text);
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px solid var(--rx-left-sidebar-border);
  border-radius: var(--rx-left-sidebar-radius-sm);
  font-weight: 700;
  text-decoration: none;
}

.rx-left-sidebar .rx-account-link:hover {
  color: var(--rx-left-sidebar-link-hover);
  background: var(--rx-left-sidebar-accent-soft);
  text-decoration: none;
}

/* =========================================================
   18. Calendar Widget
   ========================================================= */

.rx-left-sidebar .calendar_wrap table,
.rx-left-sidebar .wp-calendar-table {
  inline-size: 100%;
  border-collapse: collapse;
  text-align: center;
  font-size: 0.85rem;
}

.rx-left-sidebar .calendar_wrap caption,
.rx-left-sidebar .wp-calendar-table caption {
  margin-block-end: 0.65rem;
  color: var(--rx-left-sidebar-heading);
  font-weight: 800;
}

.rx-left-sidebar .calendar_wrap th,
.rx-left-sidebar .calendar_wrap td,
.rx-left-sidebar .wp-calendar-table th,
.rx-left-sidebar .wp-calendar-table td {
  padding: 0.45rem 0.25rem;
  border: 1px solid var(--rx-left-sidebar-border);
}

.rx-left-sidebar .calendar_wrap th,
.rx-left-sidebar .wp-calendar-table th {
  color: var(--rx-left-sidebar-heading);
  background: var(--rx-left-sidebar-bg-soft);
  font-weight: 800;
}

.rx-left-sidebar .calendar_wrap td a,
.rx-left-sidebar .wp-calendar-table td a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: 1.75rem;
  min-block-size: 1.75rem;
  color: #ffffff;
  background: var(--rx-left-sidebar-accent);
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
}

/* =========================================================
   19. Block Widgets Compatibility
   ========================================================= */

.rx-left-sidebar .wp-block-latest-posts,
.rx-left-sidebar .wp-block-categories-list,
.rx-left-sidebar .wp-block-archives-list,
.rx-left-sidebar .wp-block-page-list {
  display: grid;
  gap: 0.5rem;
}

.rx-left-sidebar .wp-block-latest-posts__post-date,
.rx-left-sidebar .wp-block-latest-comments__comment-date {
  display: block;
  margin-block-start: 0.25rem;
  color: var(--rx-left-sidebar-text-muted);
  font-size: 0.78rem;
}

.rx-left-sidebar .wp-block-latest-comments {
  padding: 0;
}

.rx-left-sidebar .wp-block-latest-comments__comment {
  margin: 0;
  padding-block: 0.7rem;
  border-block-end: 1px solid var(--rx-left-sidebar-border);
}

.rx-left-sidebar .wp-block-latest-comments__comment:last-child {
  border-block-end: 0;
}

/* =========================================================
   20. WooCommerce Sidebar Compatibility
   ========================================================= */

.rx-left-sidebar .woocommerce-widget-layered-nav-list {
  display: grid;
  gap: 0.45rem;
}

.rx-left-sidebar .woocommerce-widget-layered-nav-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.rx-left-sidebar .price_slider_wrapper {
  margin-block-start: 0.75rem;
}

.rx-left-sidebar .widget_price_filter .price_slider {
  margin-block: 1rem;
}

.rx-left-sidebar .widget_price_filter .price_slider_amount {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
}

.rx-left-sidebar .widget_price_filter .button {
  min-block-size: 38px;
  padding: 0.55rem 0.85rem;
  color: #ffffff;
  background: var(--rx-left-sidebar-accent);
  border: 0;
  border-radius: var(--rx-left-sidebar-radius-sm);
  font-weight: 800;
  cursor: pointer;
}

/* =========================================================
   21. Sidebar Badges / Pills
   ========================================================= */

.rx-left-sidebar .rx-badge,
.rx-left-sidebar .rx-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-block-size: 26px;
  padding: 0.25rem 0.55rem;
  color: var(--rx-left-sidebar-accent);
  background: var(--rx-left-sidebar-accent-soft);
  border: 1px solid color-mix(in srgb, var(--rx-left-sidebar-accent) 22%, transparent);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
  line-height: 1;
}

/* =========================================================
   22. Collapsible Sidebar Sections
   ========================================================= */

.rx-left-sidebar .rx-collapsible {
  overflow: hidden;
}

.rx-left-sidebar .rx-collapsible-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  inline-size: 100%;
  padding: 0;
  color: var(--rx-left-sidebar-heading);
  background: transparent;
  border: 0;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.rx-left-sidebar .rx-collapsible-toggle::after {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 1.5rem;
  block-size: 1.5rem;
  color: var(--rx-left-sidebar-accent);
  background: var(--rx-left-sidebar-accent-soft);
  border-radius: 999px;
  font-weight: 900;
}

.rx-left-sidebar .rx-collapsible[open] .rx-collapsible-toggle::after,
.rx-left-sidebar .rx-collapsible.is-open .rx-collapsible-toggle::after {
  content: "–";
}

.rx-left-sidebar .rx-collapsible-content {
  margin-block-start: 0.85rem;
}

/* =========================================================
   23. Empty / Loading / Skeleton State
   ========================================================= */

.rx-left-sidebar .rx-sidebar-empty {
  padding: 1rem;
  color: var(--rx-left-sidebar-text-muted);
  background: var(--rx-left-sidebar-bg-soft);
  border: 1px dashed var(--rx-left-sidebar-border-strong);
  border-radius: var(--rx-left-sidebar-radius);
  text-align: center;
}

.rx-left-sidebar .rx-skeleton {
  position: relative;
  overflow: hidden;
  background: var(--rx-left-sidebar-bg-muted);
  border-radius: var(--rx-left-sidebar-radius-sm);
}

.rx-left-sidebar .rx-skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, #ffffff 55%, transparent),
    transparent
  );
  animation: rx-left-sidebar-skeleton 1.35s infinite;
}

@keyframes rx-left-sidebar-skeleton {
  100% {
    transform: translateX(100%);
  }
}

/* =========================================================
   24. Sidebar Scrollbar
   ========================================================= */

.rx-left-sidebar-scroll {
  max-block-size: calc(100vh - var(--rx-left-sidebar-sticky-top) - 24px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--rx-left-sidebar-accent) 40%, transparent) transparent;
}

.rx-left-sidebar-scroll::-webkit-scrollbar {
  inline-size: 8px;
}

.rx-left-sidebar-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.rx-left-sidebar-scroll::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--rx-left-sidebar-accent) 38%, transparent);
  border-radius: 999px;
}

.rx-left-sidebar-scroll::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--rx-left-sidebar-accent) 58%, transparent);
}

/* =========================================================
   25. Responsive Design
   ========================================================= */

@media (max-width: 1200px) {
  :root {
    --rx-left-sidebar-width: 292px;
  }

  .rx-layout-has-left-sidebar.rx-layout-three-columns {
    grid-template-columns: minmax(0, 1fr) minmax(var(--rx-right-sidebar-min-width, 260px), var(--rx-right-sidebar-width, 320px));
  }

  .rx-layout-has-left-sidebar.rx-layout-three-columns .rx-left-sidebar-area {
    grid-column: 1 / -1;
    order: 3;
  }
}

@media (max-width: 1024px) {
  .rx-layout-has-left-sidebar {
    grid-template-columns: 1fr;
  }

  .rx-left-sidebar,
  #rx-left-sidebar,
  .left-sidebar,
  .sidebar-left {
    inline-size: 100%;
    max-inline-size: none;
  }

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

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

  .rx-left-sidebar .widget,
  .rx-left-sidebar .rx-widget,
  .rx-left-sidebar .rx-sidebar-box {
    margin-block-start: 0;
  }
}

@media (max-width: 700px) {
  .rx-left-sidebar-inner {
    grid-template-columns: 1fr;
  }

  .rx-left-sidebar .rx-post-card-mini {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .rx-left-sidebar .rx-post-card-mini-thumb {
    inline-size: 64px;
  }

  .rx-left-sidebar .search-form,
  .rx-left-sidebar .wp-block-search__inside-wrapper,
  .rx-left-sidebar .rx-sidebar-search {
    flex-direction: column;
  }

  .rx-left-sidebar .search-submit,
  .rx-left-sidebar .wp-block-search__button,
  .rx-left-sidebar .rx-sidebar-search-button {
    inline-size: 100%;
  }
}

@media (max-width: 480px) {
  .rx-left-sidebar .widget,
  .rx-left-sidebar .rx-widget,
  .rx-left-sidebar .wp-block-group,
  .rx-left-sidebar .wp-block-search,
  .rx-left-sidebar .rx-sidebar-box {
    padding: 1rem;
    border-radius: 14px;
  }

  .rx-left-sidebar .rx-sidebar-menu a,
  .rx-left-sidebar .menu a,
  .rx-left-sidebar .wp-block-navigation-item__content {
    min-block-size: 40px;
    padding: 0.6rem 0.7rem;
  }
}

/* =========================================================
   26. RTL Support
   ========================================================= */

[dir="rtl"] .rx-left-sidebar .widget li a::before,
.rtl .rx-left-sidebar .widget li a::before,
[dir="rtl"] .rx-left-sidebar .rx-widget li a::before,
.rtl .rx-left-sidebar .rx-widget li a::before {
  order: 2;
}

[dir="rtl"] .rx-left-sidebar .rx-sidebar-menu .menu-item-has-children > a::after,
.rtl .rx-left-sidebar .rx-sidebar-menu .menu-item-has-children > a::after,
[dir="rtl"] .rx-left-sidebar .menu .menu-item-has-children > a::after,
.rtl .rx-left-sidebar .menu .menu-item-has-children > a::after {
  content: "‹";
}

/* =========================================================
   27. Dark Mode Compatibility
   ========================================================= */

[data-theme="dark"] {
  --rx-left-sidebar-bg: var(--rx-surface, #111827);
  --rx-left-sidebar-bg-soft: var(--rx-surface-soft, #1f2937);
  --rx-left-sidebar-bg-muted: var(--rx-surface-muted, #273449);
  --rx-left-sidebar-text: var(--rx-text, #e5e7eb);
  --rx-left-sidebar-text-muted: var(--rx-text-muted, #94a3b8);
  --rx-left-sidebar-heading: var(--rx-heading, #f8fafc);
  --rx-left-sidebar-border: var(--rx-border, #334155);
  --rx-left-sidebar-border-strong: var(--rx-border-strong, #475569);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --rx-left-sidebar-bg: var(--rx-surface, #111827);
    --rx-left-sidebar-bg-soft: var(--rx-surface-soft, #1f2937);
    --rx-left-sidebar-bg-muted: var(--rx-surface-muted, #273449);
    --rx-left-sidebar-text: var(--rx-text, #e5e7eb);
    --rx-left-sidebar-text-muted: var(--rx-text-muted, #94a3b8);
    --rx-left-sidebar-heading: var(--rx-heading, #f8fafc);
    --rx-left-sidebar-border: var(--rx-border, #334155);
    --rx-left-sidebar-border-strong: var(--rx-border-strong, #475569);
  }

  .rx-left-sidebar .rx-medical-note,
  .rx-left-sidebar .rx-disclaimer-box {
    background: color-mix(in srgb, #f59e0b 16%, var(--rx-left-sidebar-bg));
  }

  .rx-left-sidebar .rx-medical-note-title,
  .rx-left-sidebar .rx-disclaimer-title,
  .rx-left-sidebar .rx-medical-note p,
  .rx-left-sidebar .rx-disclaimer-box p {
    color: #fbbf24;
  }
}

/* =========================================================
   28. Reduced Motion
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
  .rx-left-sidebar *,
  .rx-left-sidebar *::before,
  .rx-left-sidebar *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}

/* =========================================================
   29. High Contrast / Forced Colors
   ========================================================= */

@media (forced-colors: active) {
  .rx-left-sidebar .widget,
  .rx-left-sidebar .rx-widget,
  .rx-left-sidebar .rx-sidebar-box,
  .rx-left-sidebar .rx-sidebar-menu a,
  .rx-left-sidebar .menu a,
  .rx-left-sidebar .tagcloud a,
  .rx-left-sidebar .rx-tag-cloud a {
    border: 1px solid CanvasText;
  }

  .rx-left-sidebar .search-submit,
  .rx-left-sidebar .wp-block-search__button,
  .rx-left-sidebar .rx-newsletter-button,
  .rx-left-sidebar .rx-cta-button {
    border: 1px solid ButtonText;
  }
}

/* =========================================================
   30. Print Optimization
   ========================================================= */

@media print {
  .rx-left-sidebar,
  #rx-left-sidebar,
  .left-sidebar,
  .sidebar-left {
    display: none !important;
  }

  .rx-layout-has-left-sidebar,
  .rx-layout-has-left-sidebar.rx-layout-three-columns {
    display: block !important;
  }
}

/* =========================================================
   31. Utility Classes
   ========================================================= */

.rx-left-sidebar .rx-hidden {
  display: none !important;
}

.rx-left-sidebar .rx-visually-hidden {
  position: absolute !important;
  overflow: hidden !important;
  inline-size: 1px !important;
  block-size: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  white-space: nowrap !important;
  border: 0 !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
}

.rx-left-sidebar .rx-text-center {
  text-align: center !important;
}

.rx-left-sidebar .rx-text-muted {
  color: var(--rx-left-sidebar-text-muted) !important;
}

.rx-left-sidebar .rx-mt-0 {
  margin-block-start: 0 !important;
}

.rx-left-sidebar .rx-mb-0 {
  margin-block-end: 0 !important;
}

.rx-left-sidebar .rx-full-width {
  inline-size: 100% !important;
}

In functions.php or your enqueue file, load it like this:

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

Best placement in your RX Theme folder:

assets/
└── css/
    └── static-css/
        ├── base.css
        ├── header.css
        ├── footer.css
        ├── left-sidebar.css
        ├── right-sidebar.css
        ├── single.css
        ├── archive.css
        └── responsive.css

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