/* ============================================
   MEBEL GRAND - Premium Gaming Furniture
   Design System & Styles
   ============================================ */

/* ========== ДИЗАЙН-ТОКЕНЫ ========== */
:root {
  /* Цвета */
  --color-bg-primary: #000000;
  --color-bg-card: #0a0a0a;
  --color-bg-elevated: #141414;
  --color-accent-primary: #d4a574;
  --color-accent-hover: #e5b685;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b8b8b8;
  --color-text-tertiary: #6b6b6b;
  --color-border: #1f1f1f;
  --color-border-accent: #2a2a2a;
  --color-success: #4ade80;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  
  /* Фоновые слои */
  --overlay-dark: rgba(0, 0, 0, 0.8);
  --overlay-gradient: linear-gradient(135deg, rgba(212, 165, 116, 0.1) 0%, rgba(0, 0, 0, 0.6) 100%);
  
  /* Типографика */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  
  /* Размеры текста */
  --text-h1: 3.5rem;
  --text-h2: 3rem;
  --text-h3: 2rem;
  --text-h4: 1.5rem;
  --text-body-lg: 1.125rem;
  --text-body: 1rem;
  --text-body-sm: 0.875rem;
  --text-caption: 0.75rem;
  
  /* Отступы (4pt Grid) */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;
  
  /* Скругления */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Тени */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 8px 24px rgba(212, 165, 116, 0.15), 0 4px 8px rgba(0, 0, 0, 0.5);
  --shadow-modal: 0 20px 60px rgba(0, 0, 0, 0.7);
  
  /* Переходы */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== СБРОС И БАЗОВЫЕ СТИЛИ ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

/* ========== ТИПОГРАФИКА ========== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

h1 { font-size: var(--text-h1); letter-spacing: -0.02em; }
h2 { font-size: var(--text-h2); letter-spacing: -0.01em; }
h3 { font-size: var(--text-h3); font-weight: 600; }
h4 { font-size: var(--text-h4); font-weight: 600; }

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-accent-hover);
}

/* ========== КОНТЕЙНЕРЫ ========== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

/* ========== ХЕДЕР И НАВИГАЦИЯ ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base);
}

.header__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  max-width: 1280px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav__list {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.nav__link {
  position: relative;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-primary);
  transition: width var(--transition-base);
}

.nav__link:hover {
  color: var(--color-text-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__link--active {
  color: var(--color-accent-primary);
}

/* Переключатель языка */
.lang-switcher {
  display: flex;
  gap: var(--space-xs);
  background-color: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  padding: var(--space-xs);
}

.lang-btn {
  padding: var(--space-xs) var(--space-md);
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-body-sm);
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  text-transform: uppercase;
}

.lang-btn:hover {
  color: var(--color-text-primary);
}

.lang-btn--active {
  background-color: var(--color-accent-primary);
  color: var(--color-bg-primary);
}

/* Мобильное меню */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

/* ========== HERO СЕКЦИЯ ========== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(212, 165, 116, 0.05) 0%, rgba(0, 0, 0, 1) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(212, 165, 116, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(212, 165, 116, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  padding: var(--space-2xl) var(--space-lg);
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--text-body-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== КНОПКИ ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: var(--text-body);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-accent-primary);
  color: var(--color-bg-primary);
  box-shadow: var(--shadow-card);
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border-accent);
}

.btn--secondary:hover {
  border-color: var(--color-accent-primary);
  color: var(--color-accent-primary);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-accent-primary);
  border: 2px solid var(--color-accent-primary);
}

.btn--outline:hover {
  background-color: var(--color-accent-primary);
  color: var(--color-bg-primary);
}

/* ========== КАРТОЧКИ ========== */
.card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-accent);
}

.card__image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background-color: var(--color-bg-elevated);
}

.card__content {
  padding: var(--space-xl);
}

.card__title {
  font-size: var(--text-h4);
  margin-bottom: var(--space-sm);
}

.card__description {
  color: var(--color-text-secondary);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-lg);
}

.card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}

.card__price {
  font-size: var(--text-h4);
  font-weight: 700;
  color: var(--color-accent-primary);
}

/* ========== СЕТКА ТОВАРОВ ========== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

/* ========== ФОРМЫ ========== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-md);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-body);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.1);
}

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

/* ========== FIXED КНОПКИ (Telegram/WhatsApp) ========== */
.fixed-contacts {
  position: fixed;
  right: var(--space-lg);
  bottom: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  z-index: 999;
}

.contact-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
  border: none;
  cursor: pointer;
}

.contact-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-card-hover);
}

.contact-btn--telegram {
  background: linear-gradient(135deg, #2AABEE 0%, #229ED9 100%);
}

.contact-btn--whatsapp {
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
}

.contact-btn svg {
  width: 28px;
  height: 28px;
  fill: white;
}

/* ========== ФУТЕР ========== */
.footer {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 var(--space-xl);
  margin-top: var(--space-4xl);
}

.footer__content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.footer__section h4 {
  color: var(--color-accent-primary);
  margin-bottom: var(--space-lg);
}

.footer__links {
  list-style: none;
}

.footer__links li {
  margin-bottom: var(--space-sm);
}

.footer__links a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-accent-primary);
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--text-body-sm);
}

/* ========== МОДАЛЬНОЕ ОКНО ========== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  background-color: var(--overlay-dark);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal--active {
  display: flex;
}

.modal__content {
  background-color: var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-modal);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal__header {
  padding: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal__title {
  font-size: var(--text-h3);
  margin: 0;
}

.modal__close {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-sm);
  line-height: 1;
  transition: color var(--transition-fast);
}

.modal__close:hover {
  color: var(--color-text-primary);
}

.modal__body {
  padding: var(--space-xl);
}

/* ========== УВЕДОМЛЕНИЯ ========== */
.notification {
  position: fixed;
  top: var(--space-xl);
  right: var(--space-xl);
  z-index: 10000;
  max-width: 400px;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-modal);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.notification--success {
  background-color: var(--color-success);
  color: var(--color-bg-primary);
}

.notification--error {
  background-color: var(--color-error);
  color: white;
}

/* ========== АДАПТИВНОСТЬ ========== */
@media (max-width: 1024px) {
  :root {
    --text-h1: 3rem;
    --text-h2: 2.5rem;
    --text-h3: 1.75rem;
  }
  
  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  .nav__list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-elevated);
    flex-direction: column;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav__list--active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero {
    min-height: 70vh;
  }
  
  .product-grid {
    grid-template-columns: 1fr;
  }
  
  .footer__content {
    grid-template-columns: 1fr;
  }
  
  .fixed-contacts {
    right: var(--space-md);
    bottom: var(--space-md);
  }
}

@media (max-width: 640px) {
  :root {
    --text-h1: 2.5rem;
    --text-h2: 2rem;
    --text-h3: 1.5rem;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .section {
    padding: var(--space-xl) 0;
  }
}

/* ========== УТИЛИТЫ ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.hidden { display: none; }
.visible { display: block; }