/*
Theme Name: Ru Diplomas Catalog
Theme URI: https://example.com/ru-diplomas
Author: WordPress Developer
Author URI: https://example.com
Description: Лёгкая кастомная тема для интернет-каталога дипломов, аттестатов и справок по всей России. Совместима с Elementor и WooCommerce в режиме каталога.
Version: 1.0.0
License: GPL-2.0+
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ru-diplomas
Domain Path: /languages
Tags: custom-post-types, elementor, woocommerce, catalog, education
*/

/* ============================================
   TABLE OF CONTENTS
   1. CSS Variables (Design Tokens)
   2. CSS Reset & Base Styles
   3. Typography
   4. Layout & Grid System
   5. Header & Navigation
   6. Buttons & CTAs
   7. Cards & Grids
   8. Sliders & Carousels
   9. Forms & Popups
   10. FAQ Accordion
   11. Breadcrumbs
   12. Footer
   13. Utility Classes
   14. Responsive (Mobile-First)
   15. Accessibility
   16. Print Styles
   ============================================ */

/* ============================================
   1. CSS Variables (Design Tokens)
   ============================================ */
:root {
  /* Primary palette */
  --rd-primary: #1a56db;
  --rd-primary-dark: #1e429f;
  --rd-primary-light: #3f83f8;
  --rd-secondary: #047857;
  --rd-accent: #f59e0b;
  --rd-danger: #dc2626;

  /* Neutral palette */
  --rd-white: #ffffff;
  --rd-gray-50: #f9fafb;
  --rd-gray-100: #f3f4f6;
  --rd-gray-200: #e5e7eb;
  --rd-gray-300: #d1d5db;
  --rd-gray-400: #9ca3af;
  --rd-gray-500: #6b7280;
  --rd-gray-600: #4b5563;
  --rd-gray-700: #374151;
  --rd-gray-800: #1f2937;
  --rd-gray-900: #111827;
  --rd-black: #000000;

  /* Semantic colors */
  --rd-text-main: var(--rd-gray-800);
  --rd-text-muted: var(--rd-gray-500);
  --rd-bg-body: var(--rd-white);
  --rd-bg-light: var(--rd-gray-50);
  --rd-border: var(--rd-gray-200);

  /* Typography */
  --rd-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --rd-font-mono: "SF Mono", Monaco, "Cascadia Code", monospace;
  --rd-base-size: 16px;
  --rd-line-height: 1.6;
  --rd-h1-size: clamp(1.75rem, 4vw, 2.5rem);
  --rd-h2-size: clamp(1.5rem, 3vw, 2rem);
  --rd-h3-size: clamp(1.25rem, 2.5vw, 1.5rem);
  --rd-h4-size: clamp(1.125rem, 2vw, 1.25rem);
  --rd-body-size: clamp(0.9375rem, 1.5vw, 1rem);
  --rd-small-size: 0.875rem;

  /* Spacing scale */
  --rd-space-1: 0.25rem;
  --rd-space-2: 0.5rem;
  --rd-space-3: 0.75rem;
  --rd-space-4: 1rem;
  --rd-space-5: 1.25rem;
  --rd-space-6: 1.5rem;
  --rd-space-8: 2rem;
  --rd-space-10: 2.5rem;
  --rd-space-12: 3rem;
  --rd-space-16: 4rem;
  --rd-space-20: 5rem;

  /* Layout */
  --rd-container: 1280px;
  --rd-container-narrow: 960px;
  --rd-header-height: 72px;
  --rd-section-pad-y: clamp(3rem, 6vw, 5rem);
  --rd-border-radius: 8px;
  --rd-border-radius-lg: 12px;
  --rd-border-radius-xl: 16px;

  /* Shadows */
  --rd-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --rd-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --rd-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --rd-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --rd-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --rd-transition: 200ms ease;
  --rd-transition-slow: 300ms ease;
}

/* ============================================
   2. CSS Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
}

body {
  font-family: var(--rd-font-sans);
  font-size: var(--rd-body-size);
  line-height: var(--rd-line-height);
  color: var(--rd-text-main);
  background-color: var(--rd-bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--rd-primary);
  text-decoration: none;
  transition: color var(--rd-transition);
}

a:hover,
a:focus {
  color: var(--rd-primary-dark);
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ============================================
   3. Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--rd-gray-900);
  word-break: break-word;
}

h1 { font-size: var(--rd-h1-size); }
h2 { font-size: var(--rd-h2-size); }
h3 { font-size: var(--rd-h3-size); }
h4 { font-size: var(--rd-h4-size); }

p {
  margin-bottom: var(--rd-space-4);
}

p:last-child {
  margin-bottom: 0;
}

.rd-section-title {
  text-align: center;
  margin-bottom: var(--rd-space-8);
}

.rd-section-title h2 {
  margin-bottom: var(--rd-space-3);
}

.rd-section-subtitle {
  color: var(--rd-text-muted);
  font-size: var(--rd-body-size);
  max-width: 640px;
  margin: 0 auto;
}

/* ============================================
   4. Layout & Grid System
   ============================================ */
.rd-container {
  width: 100%;
  max-width: var(--rd-container);
  margin: 0 auto;
  padding-left: var(--rd-space-4);
  padding-right: var(--rd-space-4);
}

.rd-container-narrow {
  max-width: var(--rd-container-narrow);
}

.rd-section {
  padding-top: var(--rd-section-pad-y);
  padding-bottom: var(--rd-section-pad-y);
}

.rd-section-alt {
  background-color: var(--rd-bg-light);
}

/* Grid utilities */
.rd-grid {
  display: grid;
  gap: var(--rd-space-6);
}

.rd-grid-2 { grid-template-columns: repeat(2, 1fr); }
.rd-grid-3 { grid-template-columns: repeat(3, 1fr); }
.rd-grid-4 { grid-template-columns: repeat(4, 1fr); }
.rd-grid-5 { grid-template-columns: repeat(5, 1fr); }

/* ============================================
   5. Header & Navigation
   ============================================ */
.rd-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--rd-white);
  border-bottom: 1px solid var(--rd-border);
  box-shadow: var(--rd-shadow-sm);
}

.rd-header__top {
  background: var(--rd-gray-900);
  color: var(--rd-gray-300);
  font-size: var(--rd-small-size);
  padding: var(--rd-space-2) 0;
}

.rd-header__top a {
  color: var(--rd-gray-300);
}

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

.rd-header__main {
  padding: var(--rd-space-3) 0;
}

.rd-header__main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--rd-space-4);
}

.rd-logo img {
  max-height: 48px;
  width: auto;
}

.rd-logo__text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--rd-primary);
  line-height: 1.1;
}

.rd-logo__text span {
  color: var(--rd-gray-900);
}

/* Main navigation */
.rd-main-nav ul {
  display: flex;
  gap: var(--rd-space-6);
  align-items: center;
}

.rd-main-nav a {
  color: var(--rd-gray-700);
  font-weight: 500;
  font-size: var(--rd-small-size);
  padding: var(--rd-space-2) 0;
  position: relative;
}

.rd-main-nav a:hover,
.rd-main-nav a:focus {
  color: var(--rd-primary);
  text-decoration: none;
}

.rd-main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--rd-primary);
  transition: width var(--rd-transition);
}

.rd-main-nav a:hover::after,
.rd-main-nav a:focus::after {
  width: 100%;
}

/* Header phones */
.rd-header-phones {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--rd-space-1);
}

.rd-header-phones a {
  color: var(--rd-gray-900);
  font-weight: 700;
  font-size: 1.125rem;
  white-space: nowrap;
}

.rd-header-phones a:hover {
  color: var(--rd-primary);
  text-decoration: none;
}

/* Header actions */
.rd-header-actions {
  display: flex;
  align-items: center;
  gap: var(--rd-space-3);
}

/* Mobile burger */
.rd-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--rd-space-2);
  z-index: 110;
}

.rd-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--rd-gray-900);
  transition: all var(--rd-transition);
  border-radius: 1px;
}

.rd-burger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.rd-burger.active span:nth-child(2) {
  opacity: 0;
}

.rd-burger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   6. Buttons & CTAs
   ============================================ */
.rd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--rd-space-2);
  padding: var(--rd-space-3) var(--rd-space-6);
  font-size: var(--rd-small-size);
  font-weight: 600;
  border-radius: var(--rd-border-radius);
  transition: all var(--rd-transition);
  cursor: pointer;
  text-decoration: none;
  line-height: 1.5;
  white-space: nowrap;
}

.rd-btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.rd-btn:active {
  transform: translateY(0);
}

.rd-btn--primary {
  background: var(--rd-primary);
  color: var(--rd-white);
  border: 1px solid var(--rd-primary);
}

.rd-btn--primary:hover,
.rd-btn--primary:focus {
  background: var(--rd-primary-dark);
  border-color: var(--rd-primary-dark);
  color: var(--rd-white);
}

.rd-btn--secondary {
  background: var(--rd-secondary);
  color: var(--rd-white);
  border: 1px solid var(--rd-secondary);
}

.rd-btn--secondary:hover,
.rd-btn--secondary:focus {
  background: #065f46;
  border-color: #065f46;
  color: var(--rd-white);
}

.rd-btn--accent {
  background: var(--rd-accent);
  color: var(--rd-gray-900);
  border: 1px solid var(--rd-accent);
}

.rd-btn--accent:hover,
.rd-btn--accent:focus {
  background: #d97706;
  border-color: #d97706;
  color: var(--rd-gray-900);
}

.rd-btn--outline {
  background: transparent;
  color: var(--rd-primary);
  border: 1px solid var(--rd-primary);
}

.rd-btn--outline:hover,
.rd-btn--outline:focus {
  background: var(--rd-primary);
  color: var(--rd-white);
}

.rd-btn--ghost {
  background: transparent;
  color: var(--rd-gray-600);
  border: 1px solid transparent;
}

.rd-btn--ghost:hover,
.rd-btn--ghost:focus {
  background: var(--rd-gray-100);
  color: var(--rd-gray-900);
}

.rd-btn--sm {
  padding: var(--rd-space-2) var(--rd-space-4);
  font-size: 0.8125rem;
}

.rd-btn--lg {
  padding: var(--rd-space-4) var(--rd-space-8);
  font-size: 1rem;
}

/* CTA block */
.rd-cta-block {
  display: flex;
  flex-wrap: wrap;
  gap: var(--rd-space-3);
  align-items: center;
}

/* Messengers bar */
.rd-messengers {
  display: flex;
  gap: var(--rd-space-2);
  align-items: center;
}

.rd-messengers a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--rd-gray-100);
  transition: all var(--rd-transition);
}

.rd-messengers a:hover {
  background: var(--rd-primary);
  color: var(--rd-white);
  transform: scale(1.1);
}

/* ============================================
   7. Cards & Grids
   ============================================ */
.rd-card {
  background: var(--rd-white);
  border: 1px solid var(--rd-border);
  border-radius: var(--rd-border-radius-lg);
  overflow: hidden;
  transition: all var(--rd-transition-slow);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.rd-card:hover {
  box-shadow: var(--rd-shadow-lg);
  transform: translateY(-4px);
  border-color: var(--rd-gray-300);
}

.rd-card__image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--rd-gray-100);
}

.rd-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--rd-transition-slow);
}

.rd-card:hover .rd-card__image img {
  transform: scale(1.05);
}

.rd-card__body {
  padding: var(--rd-space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.rd-card__title {
  font-size: var(--rd-h4-size);
  font-weight: 700;
  margin-bottom: var(--rd-space-2);
  color: var(--rd-gray-900);
}

.rd-card__title a {
  color: inherit;
}

.rd-card__title a:hover {
  color: var(--rd-primary);
  text-decoration: none;
}

.rd-card__text {
  color: var(--rd-text-muted);
  font-size: var(--rd-small-size);
  margin-bottom: var(--rd-space-4);
  flex: 1;
}

.rd-card__meta {
  display: flex;
  align-items: center;
  gap: var(--rd-space-2);
  font-size: var(--rd-small-size);
  color: var(--rd-text-muted);
  margin-bottom: var(--rd-space-3);
}

.rd-card__price {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--rd-primary);
  margin-bottom: var(--rd-space-4);
}

.rd-card__actions {
  display: flex;
  gap: var(--rd-space-2);
  flex-wrap: wrap;
}

/* Category card variant */
.rd-card--category {
  text-align: center;
}

.rd-card--category .rd-card__image {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--rd-space-8);
}

.rd-card--category .rd-card__icon {
  font-size: 3rem;
  color: var(--rd-primary);
}

/* ============================================
   8. Sliders & Carousels
   ============================================ */
.rd-slider {
  position: relative;
  overflow: hidden;
}

.rd-slider__track {
  display: flex;
  transition: transform var(--rd-transition-slow);
  gap: var(--rd-space-6);
}

.rd-slider__slide {
  flex: 0 0 auto;
  width: calc(25% - var(--rd-space-4));
}

.rd-slider__nav {
  display: flex;
  justify-content: center;
  gap: var(--rd-space-4);
  margin-top: var(--rd-space-6);
}

.rd-slider__btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--rd-white);
  border: 1px solid var(--rd-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--rd-transition);
  box-shadow: var(--rd-shadow-sm);
}

.rd-slider__btn:hover {
  background: var(--rd-primary);
  border-color: var(--rd-primary);
  color: var(--rd-white);
}

.rd-slider__btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.rd-slider__dots {
  display: flex;
  justify-content: center;
  gap: var(--rd-space-2);
  margin-top: var(--rd-space-4);
}

.rd-slider__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--rd-gray-300);
  cursor: pointer;
  transition: all var(--rd-transition);
}

.rd-slider__dot.active {
  background: var(--rd-primary);
  width: 24px;
  border-radius: 4px;
}

/* ============================================
   9. Forms & Popups
   ============================================ */
.rd-form-group {
  margin-bottom: var(--rd-space-4);
}

.rd-form-label {
  display: block;
  font-weight: 500;
  font-size: var(--rd-small-size);
  margin-bottom: var(--rd-space-2);
  color: var(--rd-gray-700);
}

.rd-form-input,
.rd-form-textarea,
.rd-form-select {
  width: 100%;
  padding: var(--rd-space-3) var(--rd-space-4);
  border: 1px solid var(--rd-border);
  border-radius: var(--rd-border-radius);
  background: var(--rd-white);
  color: var(--rd-gray-900);
  font-size: var(--rd-body-size);
  transition: border-color var(--rd-transition), box-shadow var(--rd-transition);
}

.rd-form-input:focus,
.rd-form-textarea:focus,
.rd-form-select:focus {
  outline: none;
  border-color: var(--rd-primary);
  box-shadow: 0 0 0 3px rgb(26 86 219 / 0.1);
}

.rd-form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Popup / Modal */
.rd-popup-overlay {
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--rd-space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--rd-transition-slow);
}

.rd-popup-overlay.active {
  opacity: 1;
  visibility: visible;
}

.rd-popup {
  background: var(--rd-white);
  border-radius: var(--rd-border-radius-xl);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--rd-shadow-xl);
  transform: translateY(20px) scale(0.95);
  transition: transform var(--rd-transition-slow);
}

.rd-popup-overlay.active .rd-popup {
  transform: translateY(0) scale(1);
}

.rd-popup__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--rd-space-6) var(--rd-space-6) 0;
}

.rd-popup__title {
  font-size: var(--rd-h3-size);
  font-weight: 700;
}

.rd-popup__close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--rd-gray-100);
  color: var(--rd-gray-500);
  font-size: 1.25rem;
  transition: all var(--rd-transition);
}

.rd-popup__close:hover {
  background: var(--rd-gray-200);
  color: var(--rd-gray-900);
}

.rd-popup__body {
  padding: var(--rd-space-6);
}

.rd-popup__footer {
  padding: 0 var(--rd-space-6) var(--rd-space-6);
}

/* City popup (special) */
.rd-city-popup .rd-popup {
  max-width: 720px;
}

.rd-city-search {
  position: relative;
  margin-bottom: var(--rd-space-6);
}

.rd-city-search input {
  padding-left: var(--rd-space-12);
}

.rd-city-search__icon {
  position: absolute;
  left: var(--rd-space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--rd-gray-400);
}

.rd-city-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--rd-space-3);
  max-height: 400px;
  overflow-y: auto;
}

.rd-city-grid__item {
  padding: var(--rd-space-3) var(--rd-space-4);
  border-radius: var(--rd-border-radius);
  background: var(--rd-gray-50);
  font-size: var(--rd-small-size);
  font-weight: 500;
  color: var(--rd-gray-700);
  transition: all var(--rd-transition);
  cursor: pointer;
}

.rd-city-grid__item:hover,
.rd-city-grid__item:focus {
  background: var(--rd-primary);
  color: var(--rd-white);
}

/* ============================================
   10. FAQ Accordion
   ============================================ */
.rd-faq-item {
  border-bottom: 1px solid var(--rd-border);
}

.rd-faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--rd-space-5) 0;
  font-size: var(--rd-body-size);
  font-weight: 600;
  color: var(--rd-gray-900);
  text-align: left;
  cursor: pointer;
  transition: color var(--rd-transition);
}

.rd-faq-item__question:hover {
  color: var(--rd-primary);
}

.rd-faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--rd-transition);
  color: var(--rd-gray-400);
}

.rd-faq-item.active .rd-faq-item__icon {
  transform: rotate(180deg);
  color: var(--rd-primary);
}

.rd-faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--rd-transition-slow), padding var(--rd-transition-slow);
}

.rd-faq-item.active .rd-faq-item__answer {
  max-height: 500px;
  padding-bottom: var(--rd-space-5);
}

.rd-faq-item__answer p {
  color: var(--rd-text-muted);
}

/* Two-column FAQ layout */
.rd-faq--2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 var(--rd-space-8);
}

.rd-faq--2col .rd-faq-item {
  border-bottom: 1px solid var(--rd-border);
}

/* ============================================
   11. Breadcrumbs
   ============================================ */
.rd-breadcrumbs {
  background: var(--rd-gray-50);
  border-bottom: 1px solid var(--rd-border);
  padding: var(--rd-space-3) 0;
  font-size: var(--rd-small-size);
}

.rd-breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--rd-space-2);
}

.rd-breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: var(--rd-space-2);
}

.rd-breadcrumbs__separator {
  color: var(--rd-gray-400);
}

.rd-breadcrumbs a {
  color: var(--rd-gray-600);
}

.rd-breadcrumbs a:hover {
  color: var(--rd-primary);
}

.rd-breadcrumbs__current {
  color: var(--rd-gray-900);
  font-weight: 500;
}

/* ============================================
   12. Footer
   ============================================ */
.rd-footer {
  background: var(--rd-gray-900);
  color: var(--rd-gray-300);
  padding-top: var(--rd-space-16);
  padding-bottom: var(--rd-space-8);
}

.rd-footer a {
  color: var(--rd-gray-300);
}

.rd-footer a:hover {
  color: var(--rd-white);
}

.rd-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--rd-space-10);
  margin-bottom: var(--rd-space-12);
}

.rd-footer__col-title {
  color: var(--rd-white);
  font-weight: 600;
  margin-bottom: var(--rd-space-4);
  font-size: var(--rd-body-size);
}

.rd-footer__menu li {
  margin-bottom: var(--rd-space-2);
}

.rd-footer__menu a {
  font-size: var(--rd-small-size);
  transition: color var(--rd-transition);
}

.rd-footer__bottom {
  border-top: 1px solid var(--rd-gray-800);
  padding-top: var(--rd-space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--rd-space-4);
  font-size: var(--rd-small-size);
  color: var(--rd-gray-500);
}

/* ============================================
   13. Utility Classes
   ============================================ */
.rd-text-center { text-align: center; }
.rd-text-right { text-align: right; }
.rd-text-primary { color: var(--rd-primary); }
.rd-text-muted { color: var(--rd-text-muted); }
.rd-text-sm { font-size: var(--rd-small-size); }

.rd-mt-0 { margin-top: 0; }
.rd-mt-4 { margin-top: var(--rd-space-4); }
.rd-mt-6 { margin-top: var(--rd-space-6); }
.rd-mt-8 { margin-top: var(--rd-space-8); }

.rd-mb-0 { margin-bottom: 0; }
.rd-mb-4 { margin-bottom: var(--rd-space-4); }
.rd-mb-6 { margin-bottom: var(--rd-space-6); }
.rd-mb-8 { margin-bottom: var(--rd-space-8); }

.rd-flex { display: flex; }
.rd-items-center { align-items: center; }
.rd-justify-between { justify-content: space-between; }
.rd-gap-2 { gap: var(--rd-space-2); }
.rd-gap-4 { gap: var(--rd-space-4); }
.rd-gap-6 { gap: var(--rd-space-6); }

.rd-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to content link */
.rd-skip-link {
  position: absolute;
  top: -100%;
  left: var(--rd-space-4);
  z-index: 9999;
  background: var(--rd-primary);
  color: var(--rd-white);
  padding: var(--rd-space-3) var(--rd-space-6);
  border-radius: 0 0 var(--rd-border-radius) var(--rd-border-radius);
  font-weight: 600;
  transition: top var(--rd-transition);
}

.rd-skip-link:focus {
  top: 0;
}

/* Hide utilities */
.hide-on-desktop {
  display: none;
}

/* ============================================
   14. Responsive (Mobile-First)
   ============================================ */

/* Tablet (max-width: 1024px) */
@media (max-width: 1024px) {
  .rd-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .rd-grid-5 { grid-template-columns: repeat(3, 1fr); }

  .rd-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .rd-slider__slide {
    width: calc(33.333% - var(--rd-space-4));
  }
}

/* Mobile landscape (max-width: 768px) */
@media (max-width: 768px) {
  :root {
    --rd-header-height: 64px;
  }

  .rd-grid-2,
  .rd-grid-3,
  .rd-grid-4,
  .rd-grid-5 {
    grid-template-columns: repeat(2, 1fr);
  }

  .rd-burger {
    display: flex;
  }

  .rd-main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 360px;
    height: 100vh;
    background: var(--rd-white);
    z-index: 105;
    padding: var(--rd-space-20) var(--rd-space-6) var(--rd-space-6);
    box-shadow: var(--rd-shadow-xl);
    transition: right var(--rd-transition-slow);
    overflow-y: auto;
  }

  .rd-main-nav.active {
    right: 0;
  }

  .rd-main-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--rd-space-2);
  }

  .rd-main-nav a {
    display: block;
    width: 100%;
    padding: var(--rd-space-3) 0;
    font-size: var(--rd-body-size);
    border-bottom: 1px solid var(--rd-border);
  }

  .rd-main-nav a::after {
    display: none;
  }

  .rd-header-phones {
    display: none;
  }

  .rd-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--rd-space-8);
  }

  .rd-slider__slide {
    width: calc(50% - var(--rd-space-3));
  }

  .rd-faq--2col {
    grid-template-columns: 1fr;
  }

  .rd-city-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .hide-on-desktop {
    display: block;
  }

  /* Mobile menu overlay */
  .rd-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 0.4);
    z-index: 104;
    opacity: 0;
    visibility: hidden;
    transition: all var(--rd-transition-slow);
  }

  .rd-nav-overlay.active {
    opacity: 1;
    visibility: visible;
  }
}

/* Small mobile (max-width: 480px) */
@media (max-width: 480px) {
  .rd-grid-2,
  .rd-grid-3,
  .rd-grid-4,
  .rd-grid-5 {
    grid-template-columns: 1fr;
  }

  .rd-slider__slide {
    width: 100%;
  }

  .rd-section {
    padding-top: var(--rd-space-8);
    padding-bottom: var(--rd-space-8);
  }

  .rd-city-grid {
    grid-template-columns: 1fr;
  }

  .rd-header__top {
    font-size: 0.75rem;
  }
}

/* ============================================
   15. Accessibility
   ============================================ */
*:focus-visible {
  outline: 2px solid var(--rd-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   16. Print Styles
   ============================================ */
@media print {
  .rd-header,
  .rd-footer,
  .rd-popup-overlay,
  .rd-burger,
  .rd-slider__nav,
  .rd-slider__dots {
    display: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }

  a {
    text-decoration: underline;
    color: #000;
  }

  .rd-card {
    break-inside: avoid;
    border: 1px solid #ccc;
  }
}