/* ============================================
   TechStore - Shared Styles (styles.css)
   Спільні стилі для усього сайту
   ============================================ */

/* ============================================
   CSS Variables - Централізовані
   ============================================ */
:root {
  /* Brand Colors — Midnight Indigo palette */
  --primary-color: #6366F1;
  --primary-dark: #4F46E5;
  --primary-light: #818CF8;
  --secondary-color: #22D3EE;
  --accent-color: #F59E0B;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-light: #94A3B8;

  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFF;
  --bg-dark: #0D0F1A;

  --border-color: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.10);
  --shadow-lg: 0 8px 32px rgba(15, 23, 42, 0.14);
  --shadow-glow: 0 0 24px rgba(99, 102, 241, 0.25);

  --success-color: #10B981;
  --warning-color: #F59E0B;
  --danger-color: #EF4444;
  --info-color: #0EA5E9;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.45s ease;

  /* Container */
  --container-max-width: 1280px;
  --container-padding: 1.5rem;

  /* Header Height */
  --header-height: 130px;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-light: #64748B;
  --bg-primary: #0F0F1A;
  --bg-secondary: #1A1A2E;
  --bg-dark: #06060F;
  --border-color: #2D2D4E;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 32px rgba(99, 102, 241, 0.35);
  --primary-color: #818CF8;
  --primary-dark: #6366F1;
  --primary-light: #A5B4FC;
  --secondary-color: #67E8F9;
}

/* ============================================
   Reset & Base
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary) !important;
  font-size: var(--font-size-base) !important;
  line-height: 1.6 !important;
  color: var(--text-primary) !important;
  background-color: var(--bg-primary) !important;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease !important;
}

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

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

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

ul, ol {
  list-style: none;
}

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

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

/* ============================================
   Common Cards
   ============================================ */
.card,
.product-card,
.cart-item,
.contact-card,
.value-card,
.team-card,
.category-card,
.feature-item {
  background: var(--bg-primary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-lg) !important;
  transition: var(--transition-base) !important;
}

[data-theme="dark"] .card,
[data-theme="dark"] .product-card,
[data-theme="dark"] .cart-item,
[data-theme="dark"] .contact-card,
[data-theme="dark"] .value-card,
[data-theme="dark"] .team-card,
[data-theme="dark"] .category-card,
[data-theme="dark"] .feature-item {
  background: var(--bg-secondary) !important;
  border-color: var(--border-color) !important;
}

/* ============================================
   Common Buttons
   ============================================ */
.btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 0.5rem !important;
  padding: 0.75rem 1.625rem !important;
  font-size: var(--font-size-base) !important;
  font-weight: 600 !important;
  border-radius: var(--radius-md) !important;
  cursor: pointer !important;
  transition: var(--transition-base) !important;
  text-align: center !important;
  text-decoration: none !important;
  border: 2px solid transparent !important;
  white-space: nowrap !important;
  letter-spacing: 0.01em !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%) !important;
  color: white !important;
  border-color: transparent !important;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35) !important;
}

.btn-primary:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5) !important;
  filter: brightness(1.08) !important;
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary-color) 0%, #06B6D4 100%) !important;
  color: white !important;
  border-color: transparent !important;
  box-shadow: 0 4px 14px rgba(34, 211, 238, 0.3) !important;
}

.btn-secondary:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(34, 211, 238, 0.45) !important;
}

.btn-outline {
  background: transparent !important;
  color: var(--primary-color) !important;
  border-color: var(--primary-color) !important;
}

.btn-outline:hover {
  background: var(--primary-color) !important;
  color: white !important;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35) !important;
  transform: translateY(-2px) !important;
}

.btn:disabled {
  opacity: 0.5 !important;
  cursor: not-allowed !important;
  transform: none !important;
  box-shadow: none !important;
}

.btn-sm {
  padding: 0.5rem 1rem !important;
  font-size: var(--font-size-sm) !important;
}

.btn-lg {
  padding: 1rem 2.25rem !important;
  font-size: var(--font-size-lg) !important;
}

/* ============================================
   Common Forms
   ============================================ */
.form-input,
.form-select,
.form-textarea,
.search-input,
.promo-input,
.qty-input {
  width: 100% !important;
  padding: 0.75rem 1rem !important;
  border: 2px solid var(--border-color) !important;
  border-radius: var(--radius-md) !important;
  font-size: var(--font-size-base) !important;
  transition: var(--transition-base) !important;
  background: var(--bg-primary) !important;
  color: var(--text-primary) !important;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus,
.search-input:focus {
  outline: none !important;
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12) !important;
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .form-textarea,
[data-theme="dark"] .search-input,
[data-theme="dark"] .promo-input {
  background: var(--bg-primary) !important;
  border-color: var(--border-color) !important;
  color: var(--text-primary) !important;
}

input::placeholder,
textarea::placeholder {
  color: var(--text-light) !important;
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
  color: var(--text-light) !important;
}

/* ============================================
   Common Images
   ============================================ */
.product-image,
.cart-item-image,
.thumbnail-item,
.main-image,
.category-icon,
.about-image {
  background: var(--bg-secondary) !important;
  border-radius: var(--radius-md) !important;
}

[data-theme="dark"] .product-image,
[data-theme="dark"] .cart-item-image,
[data-theme="dark"] .thumbnail-item,
[data-theme="dark"] .main-image,
[data-theme="dark"] .category-icon,
[data-theme="dark"] .about-image {
  background: var(--bg-primary) !important;
}

/* ============================================
   Common Icons
   ============================================ */
.contact-icon,
.value-icon,
.feature-icon,
.empty-icon,
.empty-cart-icon,
.no-results-icon {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  background: rgba(99, 102, 241, 0.08) !important;
  color: var(--primary-color) !important;
  border-radius: var(--radius-full) !important;
  transition: var(--transition-base) !important;
}

[data-theme="dark"] .contact-icon,
[data-theme="dark"] .value-icon,
[data-theme="dark"] .feature-icon,
[data-theme="dark"] .empty-icon,
[data-theme="dark"] .empty-cart-icon,
[data-theme="dark"] .no-results-icon {
  background: rgba(129, 140, 248, 0.12) !important;
}

/* ============================================
   Common Badges
   ============================================ */
.badge,
.product-badge,
.badge-new,
.badge-sale,
.badge-hot {
  padding: 0.3rem 0.65rem !important;
  border-radius: var(--radius-sm) !important;
  font-size: 0.7rem !important;
  font-weight: 700 !important;
  text-transform: uppercase !important;
  letter-spacing: 0.6px !important;
  white-space: nowrap !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12) !important;
}

.badge-new,
.product-badge.new {
  background: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%) !important;
  color: white !important;
}

.badge-sale,
.product-badge.sale {
  background: linear-gradient(135deg, #EF4444 0%, #DC2626 100%) !important;
  color: white !important;
}

.badge-hot,
.product-badge.hot {
  background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%) !important;
  color: white !important;
}

/* ============================================
   Common Prices
   ============================================ */
.price-current {
  font-weight: 700 !important;
  color: var(--primary-color) !important;
}

.price-old {
  color: var(--text-light) !important;
  text-decoration: line-through !important;
}

/* ============================================
   Common Ratings
   ============================================ */
.product-stars,
.rating-stars,
.review-stars {
  display: flex !important;
  gap: 2px !important;
  color: var(--warning-color) !important;
}

/* ============================================
   Common Sections
   ============================================ */
section {
  padding: var(--spacing-2xl) 0 !important;
}

.section-title {
  font-size: var(--font-size-3xl) !important;
  font-weight: 800 !important;
  color: var(--text-primary) !important;
  letter-spacing: -0.02em !important;
}

.page-title {
  font-size: var(--font-size-4xl) !important;
  font-weight: 800 !important;
  color: var(--text-primary) !important;
  letter-spacing: -0.02em !important;
}

/* ============================================
   Common Modals
   ============================================ */
.modal {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  z-index: 9999 !important;
  display: none !important;
  align-items: center !important;
  justify-content: center !important;
  padding: var(--spacing-md) !important;
}

.modal.show {
  display: flex !important;
}

.modal-overlay {
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  background: rgba(6, 6, 15, 0.65) !important;
  backdrop-filter: blur(6px) !important;
}

.modal-content {
  position: relative !important;
  background: var(--bg-primary) !important;
  border-radius: var(--radius-xl) !important;
  padding: var(--spacing-xl) !important;
  max-width: 500px !important;
  width: 100% !important;
  box-shadow: var(--shadow-lg) !important;
  animation: modalSlideIn 0.3s ease !important;
  border: 1px solid var(--border-color) !important;
}

[data-theme="dark"] .modal-content {
  background: var(--bg-secondary) !important;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-24px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ============================================
   Common Loading
   ============================================ */
.loading,
.loading-overlay {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.spinner {
  width: 40px !important;
  height: 40px !important;
  border: 3px solid var(--border-color) !important;
  border-top-color: var(--primary-color) !important;
  border-radius: 50% !important;
  animation: spin 0.75s linear infinite !important;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   Common Empty States
   ============================================ */
.empty-state,
.empty-cart,
.no-results {
  text-align: center !important;
  padding: var(--spacing-2xl) !important;
}

.empty-title,
.empty-cart-title,
.no-results-title {
  font-size: var(--font-size-2xl) !important;
  font-weight: 700 !important;
  color: var(--text-primary) !important;
}

.empty-text,
.empty-cart-text,
.no-results-text {
  color: var(--text-secondary) !important;
  line-height: 1.8 !important;
}

/* ============================================
   Common Animations
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-28px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(28px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  33% {
    transform: translateY(-14px) rotate(1deg);
  }
  66% {
    transform: translateY(-8px) rotate(-1deg);
  }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
  50% { box-shadow: 0 0 40px rgba(99, 102, 241, 0.6); }
}

/* ============================================
   Common Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--border-color);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) var(--bg-secondary);
}

[data-theme="dark"] * {
  scrollbar-color: var(--border-color) var(--bg-dark);
}

/* ============================================
   Selection
   ============================================ */
::selection {
  background: rgba(99, 102, 241, 0.18);
  color: var(--text-primary);
}

[data-theme="dark"] ::selection {
  background: rgba(129, 140, 248, 0.28);
  color: var(--text-primary);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-grid { display: grid !important; }

.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }

.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }

/* ============================================
   Responsive Typography
   ============================================ */
@media (max-width: 768px) {
  :root {
    --font-size-3xl: 1.75rem;
    --font-size-2xl: 1.5rem;
    --font-size-4xl: 2rem;
  }

  h1 { font-size: 2rem !important; }
  h2 { font-size: 1.5rem !important; }
  h3 { font-size: 1.25rem !important; }
}

@media (max-width: 480px) {
  :root {
    --font-size-2xl: 1.25rem;
    --font-size-4xl: 1.75rem;
  }

  h1 { font-size: 1.75rem !important; }
  h2 { font-size: 1.25rem !important; }
  h3 { font-size: 1.125rem !important; }
}

/* ============================================
   Accessibility
   ============================================ */
.keyboard-navigation *:focus {
  outline: 2px solid var(--primary-color) !important;
  outline-offset: 3px !important;
}

@media (prefers-contrast: high) {
  .card,
  .product-card,
  .btn {
    border-width: 3px !important;
  }

  [data-theme="dark"] {
    --border-color: #5B5B8F;
    --text-secondary: #CBD5E1;
  }
}

@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;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .header,
  .footer,
  .btn,
  .nav-icon,
  .theme-toggle,
  .language-switcher,
  .mobile-menu-toggle {
    display: none !important;
  }

  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }

  body {
    font-size: 12pt !important;
  }

  .container {
    max-width: 100% !important;
    padding: 0 !important;
  }
}