/* ===== CSS ПЕРЕМЕННЫЕ ===== */
:root {
  /* Цветовая палитра */
  --color-primary: #667eea;
  --color-primary-dark: #5a6fd8;
  --color-secondary: #764ba2;
  --color-accent: #f093fb;
  --color-success: #4ade80;
  --color-warning: #fbbf24;
  --color-error: #ef4444;
  
  /* Текст */
  --color-text-primary: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-light: #f9fafb;
  
  /* Фоны */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-dark: #1f2937;
  --color-bg-card: #ffffff;
  
  /* Границы */
  --color-border: #e5e7eb;
  --color-border-hover: #d1d5db;
  
  /* Тени */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Радиусы */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Отступы */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Анимации */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Темная тема */
[data-theme="dark"] {
  --color-text-primary: #f9fafb;
  --color-text-secondary: #d1d5db;
  --color-bg-primary: #111827;
  --color-bg-secondary: #1f2937;
  --color-bg-card: #374151;
  --color-border: #4b5563;
  --color-border-hover: #6b7280;
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  min-height: 100vh;
  line-height: 1.6;
  color: var(--color-text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== КОНТЕЙНЕР СТРАНИЦЫ ===== */
.page-container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--color-bg-primary);
  min-height: 100vh;
  box-shadow: var(--shadow-xl);
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  grid-template-areas: 
    "header"
    "nav"
    "main"
    "footer";
}

/* ===== ШАПКА ===== */
.header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-light);
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  grid-area: header;
  position: relative;
}

.header__title {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0;
  text-shadow: var(--shadow-md);
}

/* Переключатель темы */
.theme-toggle {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-xl);
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: var(--radius-xl);
  padding: var(--space-sm);
  cursor: pointer;
  transition: var(--transition-normal);
  backdrop-filter: blur(10px);
  font-size: 1.2rem;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
} 

.theme-toggle:active {
  transform: scale(0.95);
}

/* ===== НАВИГАЦИЯ ===== */
.nav {
  background: var(--color-bg-secondary);
  padding: var(--space-md) 0;
  grid-area: nav;
  border-bottom: 1px solid var(--color-border);
}

.nav__list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin: 0;
  padding: 0;
}

.nav__item {
  margin: 0;
}

.nav__link {
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  font-weight: 500;
  display: block;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.nav__link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left var(--transition-slow);
}

.nav__link:hover::before {
  left: 100%;
}

.nav__link:hover {
  background: var(--color-primary);
  color: var(--color-text-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.nav__link:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.nav__link--active {
  background: var(--color-primary);
  color: var(--color-text-light);
  box-shadow: var(--shadow-md);
}

/* ===== ОСНОВНОЙ КОНТЕНТ ===== */
.content {
  padding: var(--space-2xl);
  max-width: 900px;
  margin: 0 auto;
  grid-area: main;
}

/* ===== КАРТОЧКИ ===== */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

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

.card--highlight {
  border-left: 4px solid var(--color-primary);
}

.card--success {
  border-left-color: var(--color-success);
}

.card--warning {
  border-left-color: var(--color-warning);
}

.card--error {
  border-left-color: var(--color-error);
}

/* ===== КНОПКИ ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  font-family: inherit;
  font-size: 1rem;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transition: width var(--transition-normal), height var(--transition-normal), top var(--transition-normal), left var(--transition-normal);
}

.btn:active::after {
  width: 100px;
  height: 100px;
  top: -20px;
  left: -20px;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-light);
}

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

.btn--primary:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

.btn--secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-border);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.btn--large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1.1rem;
}

.btn--disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn--disabled:hover {
  transform: none !important;
  box-shadow: none !important;
}

.btn--success {
  background: var(--color-success);
  color: white;
}

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

.form__label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.form__input {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all var(--transition-normal);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: inherit;
}

.form__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form__input--error {
  border-color: var(--color-error);
}

.form__input--success {
  border-color: var(--color-success);
}

/* ===== КАРТОЧКА ТОВАРА ===== */
.product-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  position: relative;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.product-card--selected {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.product-card--discount::before {
  content: 'СКИДКА';
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--color-error);
  color: var(--color-text-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  z-index: 2;
}

.product-card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

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

.product-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.product-card__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.product-card__price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.product-card__price--old {
  font-size: 1rem;
  color: var(--color-text-secondary);
  text-decoration: line-through;
  margin-right: var(--space-sm);
}

/* ===== ПРОФИЛЬ ===== */
.profile-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.profile-title {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  font-weight: 300;
}

.profile-photo {
  width: 220px;
  height: 280px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  margin: var(--space-lg) auto;
  border: 3px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-normal);
}

.profile-photo:hover {
  transform: scale(1.05);
}

.profile-name {
  font-size: 1.8rem;
  color: var(--color-text-primary);
  margin: var(--space-md) 0;
  font-weight: 600;
}

.profile-group {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin: var(--space-sm) 0;
}

/* ===== ОБО МНЕ ===== */
.about-me__text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

/* ===== НАВЫКИ ===== */
.skills-section {
  margin: var(--space-xl) 0;
}

.section-title {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  font-weight: 600;
}

.skills-grid {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.skill-tag {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-light);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.skill-tag:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ===== ОПЫТ РАБОТЫ ===== */
.experience-section {
  margin: var(--space-2xl) 0;
}

.experience-grid {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.experience-card {
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.experience-card:hover {
  transform: translateY(-5px);
}

.experience-card__title {
  font-size: 1.4rem;
  color: var(--color-primary);
  margin: 0 0 var(--space-md) 0;
  font-weight: 600;
}

.experience-card__desc {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0 0 var(--space-lg) 0;
  flex-grow: 1;
}

.experience-card__btn {
  align-self: flex-start;
  margin-top: auto;
}

/* ===== НОВОСТИ ===== */
.news-container {
  display: grid;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.news-item {
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.news-item:hover {
  transform: translateY(-5px);
}

.news-title {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin: 0 0 var(--space-md) 0;
  font-weight: 600;
}

.news-meta {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-sm);
}

.news-content {
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 1rem;
  flex-grow: 1;
}

/* ===== ПРАКТИКИ ===== */
.practices-list {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.practice-item {
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.practice-item:hover {
  transform: translateX(5px);
}

.practice-title {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin: 0 0 var(--space-sm) 0;
  font-weight: 600;
}

.practice-desc {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ===== КОНТАКТЫ ===== */
.contacts-container {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.contact-item {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-title {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin: 0 0 var(--space-md) 0;
  font-weight: 600;
}

.contact-info {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-lg) 0;
}

.contact-button {
  margin-top: auto;
}

/* ===== МОДАЛЬНОЕ ОКНО ===== */
.modal {
  border: none;
  border-radius: var(--radius-xl);
  padding: 0;
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90vw;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.modal::backdrop {
  background: rgba(0, 0, 0, 0.8);
}

.modal-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-light);
  padding: var(--space-lg);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  margin: 0;
}

.modal-header h2 {
  margin: 0;
  color: var(--color-text-light);
  font-size: 1.5rem;
}

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

.modal-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

/* ===== СОСТОЯНИЯ ===== */
.state--loading {
  opacity: 0.7;
  pointer-events: none;
}

.state--hidden {
  display: none !important;
}

.state--visible {
  display: block !important;
}

/* Анимация загрузки */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.state--loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ===== СЕТКИ ===== */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2cols {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3cols {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid--4cols {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ===== ФУТЕР ===== */
.footer {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  text-align: center;
  padding: var(--space-xl);
  margin-top: var(--space-2xl);
  grid-area: footer;
  border-top: 1px solid var(--color-border);
}

.footer__text {
  margin: 0;
  color: var(--color-text-secondary);
}

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

.mb-xs { margin-bottom: var(--space-xs); }
.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); }

.mt-xs { margin-top: var(--space-xs); }
.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); }

/* ===== АДАПТИВНОСТЬ ===== */
@media (max-width: 768px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  .page-container {
    grid-template-rows: auto auto 1fr auto;
  }
  
  .nav__list {
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
  }
  
  .content {
    padding: var(--space-lg);
  }
  
  .grid--2cols,
  .grid--3cols,
  .grid--4cols {
    grid-template-columns: 1fr;
  }
  
  .header__title {
    font-size: 2rem;
  }
  
  .profile-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 1.6rem;
  }
  
  .theme-toggle {
    position: static;
    margin-top: var(--space-md);
  }
  
  .modal-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .content {
    padding: var(--space-md);
  }
  
  .card {
    padding: var(--space-lg);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .profile-photo {
    width: 180px;
    height: 230px;
  }
}