/* 
 * Современные стили для сайта Авангард-Строй
 * Автор: Claude 3.7 Sonnet
 * Дата: 2023
 */

/* Нормализация и базовые стили */
:root {
  --color-primary: #2D71AC;
  --color-primary-dark: #1D496F;
  --color-secondary: #445869;
  --color-accent: #E8F1FA;
  --color-text: #333333;
  --color-text-light: #728BA1;
  --color-background: #ffffff;
  --color-background-light: #f8f8f8;
  --color-border: #e0e0e0;
  
  --font-primary: 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-secondary: 'PT Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  --border-radius-sm: 3px;
  --border-radius-md: 5px;
  --border-radius-lg: 8px;
  
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  
  --container-width: 1200px;
  --container-padding: 15px;
}

/* Сброс стилей */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Базовые стили */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  line-height: 1.5;
  background-color: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

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

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

/* Контейнер */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Шапка сайта */
.site-header {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 100;
}

/* Верхняя панель */
.top-bar {
  background-color: var(--color-background-light);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.top-bar__contact {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.top-bar__address {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

.top-bar__phone {
  color: #e53935;
  font-weight: 700;
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.top-bar__phone::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23e53935'%3E%3Cpath d='M20.01 15.38c-1.23 0-2.42-.2-3.53-.56a.977.977 0 00-1.01.24l-1.57 1.97c-2.83-1.35-5.48-3.9-6.89-6.83l1.95-1.66c.27-.28.35-.67.24-1.02-.37-1.11-.56-2.3-.56-3.53 0-.54-.45-.99-.99-.99H4.19C3.65 3 3 3.24 3 3.99 3 13.28 10.73 21 20.01 21c.71 0 .99-.63.99-1.18v-3.45c0-.54-.45-.99-.99-.99z'/%3E%3C/svg%3E");
  background-size: contain;
}

/* Поиск */
.search-form {
  position: relative;
  width: 100%;
  max-width: 250px;
}

.search-form__input {
  width: 100%;
  padding: 0.5rem 2.5rem 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-form__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(45, 113, 172, 0.2);
}

.search-form__button {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

/* Основная шапка */
.main-header {
  padding: var(--spacing-md) 0;
  background-color: var(--color-background);
}

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

.logo {
  display: block;
  max-width: 300px;
}

.logo img {
  width: 100%;
  height: auto;
}

/* Главное меню */
.main-nav {
  position: relative;
}

.menu-toggle {
  display: none;
  padding: var(--spacing-sm);
  background-color: var(--color-primary);
  border-radius: var(--border-radius-sm);
  color: white;
}

.menu-toggle__icon {
  display: block;
  position: relative;
  width: 24px;
  height: 2px;
  background-color: white;
}

.menu-toggle__icon::before,
.menu-toggle__icon::after {
  content: "";
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: white;
  transition: transform var(--transition-fast);
}

.menu-toggle__icon::before {
  top: -6px;
}

.menu-toggle__icon::after {
  bottom: -6px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon {
  background-color: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::before {
  transform: rotate(45deg) translate(4px, 6px);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::after {
  transform: rotate(-45deg) translate(4px, -6px);
}

.main-menu {
  display: flex;
  gap: var(--spacing-lg);
}

.main-menu__item {
  position: relative;
}

.main-menu__item > a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.main-menu__item > a:hover {
  color: var(--color-primary);
}

.main-menu__item--current > a {
  color: var(--color-primary);
}

.main-menu__item--has-children > a::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  vertical-align: 2px;
}

.sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 220px;
  background-color: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-medium);
  z-index: 100;
}

.main-menu__item:hover .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.sub-menu li a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: background-color var(--transition-fast);
}

.sub-menu li a:hover {
  background-color: var(--color-background-light);
  color: var(--color-primary);
}

/* Основной контент */
.site-main {
  flex: 1;
}

/* Герой-секция */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  padding: var(--spacing-xxl) 0;
  margin-bottom: var(--spacing-xxl);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  position: relative;
}

.hero__content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  animation: fadeInDown 0.8s ease-out;
}

.hero__description {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero__button {
  display: inline-flex;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.2);
  border: 2px solid white;
  color: white;
  font-weight: 500;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-medium);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero__button:hover {
  background-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  color: white;
}

.hero__button::after {
  content: "→";
  margin-left: var(--spacing-sm);
  transition: transform var(--transition-fast);
}

.hero__button:hover::after {
  transform: translateX(4px);
}

/* Основные блоки */
.main-content {
  margin-bottom: var(--spacing-xxl);
}

.main-content__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  background-color: white;
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* Прайс-лист блок */
.price-block {
  display: flex;
  align-items: center;
  justify-content: center;
}

.price-block__link {
  display: block;
  transition: transform var(--transition-medium);
}

.price-block__link:hover {
  transform: scale(1.02);
}

.price-block__image {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius-md);
}

/* Блок "Что мы предлагаем" */
.offers-block {
  padding: var(--spacing-md);
}

.section-title {
  color: var(--color-secondary);
  font-size: 1.5rem;
  text-transform: uppercase;
  margin-bottom: var(--spacing-xl);
  font-weight: 500;
  position: relative;
}

.section-title--accent {
  text-align: center;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
}

.section-title--large {
  font-size: 1.75rem;
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.offers-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.offer-item {
  position: relative;
  padding-left: 36px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease-out forwards;
}

.offer-item:nth-child(1) { animation-delay: 0.1s; }
.offer-item:nth-child(2) { animation-delay: 0.2s; }
.offer-item:nth-child(3) { animation-delay: 0.3s; }
.offer-item:nth-child(4) { animation-delay: 0.4s; }
.offer-item:nth-child(5) { animation-delay: 0.5s; }

.offer-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 24px;
  height: 24px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%232D71AC'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: contain;
}

.offer-item__title {
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-xs);
  font-size: 1.125rem;
}

.offer-item__text {
  color: var(--color-text);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Популярные товары */
.popular-products {
  background-color: var(--color-background-light);
  padding: var(--spacing-xl) 0;
  margin-bottom: var(--spacing-xxl);
  border-radius: var(--border-radius-lg);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.product-card {
  background-color: white;
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  text-align: center;
  color: var(--color-text);
  font-weight: 500;
  transition: all var(--transition-medium);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
  opacity: 0;
  animation: fadeIn 0.5s ease-out forwards;
}

.product-card:nth-child(1) { animation-delay: 0.05s; }
.product-card:nth-child(2) { animation-delay: 0.1s; }
.product-card:nth-child(3) { animation-delay: 0.15s; }
.product-card:nth-child(4) { animation-delay: 0.2s; }
.product-card:nth-child(5) { animation-delay: 0.25s; }
.product-card:nth-child(6) { animation-delay: 0.3s; }
.product-card:nth-child(7) { animation-delay: 0.35s; }
.product-card:nth-child(8) { animation-delay: 0.4s; }
.product-card:nth-child(9) { animation-delay: 0.45s; }

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  color: var(--color-primary);
}

.product-card--featured {
  grid-column: 1 / -1;
  background-color: white;
  border: 1px solid var(--color-border);
  max-width: 300px;
  margin: var(--spacing-md) auto 0;
}

/* Каталог продукции */
.catalog-section {
  margin-bottom: var(--spacing-xxl);
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.catalog-item {
  display: flex;
  flex-direction: column;
  background-color: white;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: transform var(--transition-medium);
  opacity: 0;
  transform: translateY(30px);
}

.catalog-item.animated {
  animation: fadeInUp 0.6s ease-out forwards;
}

.catalog-item:hover {
  transform: translateY(-4px);
}

.catalog-item__image-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 соотношение */
  overflow: hidden;
  background-color: var(--color-background-light);
}

.catalog-item__image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-medium);
}

.catalog-item:hover .catalog-item__image {
  transform: scale(1.05);
}

.catalog-item__image-wrapper--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-background-light);
}

.catalog-item__no-image {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.catalog-item__title {
  padding: var(--spacing-md);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.catalog-item:hover .catalog-item__title {
  color: var(--color-primary);
}

.catalog-footer {
  text-align: center;
  margin-top: var(--spacing-xl);
  opacity: 0;
  animation: fadeIn 0.8s ease-out 0.6s forwards;
}

.catalog-more {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.catalog-more:hover {
  background-color: var(--color-primary-dark);
  color: white;
}

/* Призыв к действию */
.cta-section {
  background-color: var(--color-background-light);
  padding: var(--spacing-xl) 0;
  text-align: center;
  margin-bottom: var(--spacing-xxl);
  border-radius: var(--border-radius-lg);
}

.cta-text {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-secondary);
}

.cta-button {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: #e53935;
  color: white;
  border-radius: var(--border-radius-md);
  font-weight: 700;
  font-size: 1.125rem;
  transition: all var(--transition-medium);
}

.cta-button:hover {
  background-color: #c62828;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  color: white;
}

/* Подвал сайта */
.site-footer {
  background-color: var(--color-secondary);
  color: white;
  padding: var(--spacing-xl) 0;
  margin-top: auto;
}

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

.footer-copyright {
  font-size: 0.875rem;
  opacity: 0.8;
}

.footer-contacts {
  text-align: right;
}

.footer-contacts p {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-bottom: var(--spacing-xs);
}

.footer-contacts a {
  color: white;
  font-weight: 700;
}

.footer-contacts a:hover {
  opacity: 0.8;
}

/* Анимации */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

/* Стили для доступности */
.keyboard-focus {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.search-form__input.error {
  border-color: #e53935;
  animation: shake 0.4s linear;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

/* Медиа-запросы */
@media (max-width: 992px) {
  .main-content__grid {
    grid-template-columns: 1fr;
  }
  
  .price-block {
    margin-bottom: var(--spacing-lg);
  }
  
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .top-bar__content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .top-bar__contact {
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: center;
    margin-bottom: var(--spacing-sm);
  }
  
  .main-header__content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .menu-toggle {
    display: block;
    position: absolute;
    top: -50px;
    right: 0;
  }
  
  .main-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: white;
    flex-direction: column;
    gap: 0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    display: none;
    z-index: 100;
  }
  
  .main-menu.is-active {
    display: block;
  }
  
  .main-menu__item > a {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
  }
  
  .sub-menu {
    position: static;
    width: 100%;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    background-color: var(--color-background-light);
  }
  
  .main-menu__item--has-children:hover .sub-menu {
    display: block;
  }
  
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .catalog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .footer-contacts {
    text-align: center;
  }
}

@media (max-width: 576px) {
  .hero__title {
    font-size: 1.75rem;
  }
  
  .hero__description {
    font-size: 1rem;
  }
  
  .product-grid {
    grid-template-columns: 1fr;
  }
  
  .catalog-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 1.25rem;
  }
  
  .section-title--large {
    font-size: 1.5rem;
  }
}