/* CSS Variables for theming */
:root {
  --color-primary: #8E7F7F;
  --color-secondary: #BBAAAA;
  --color-accent: #E7D2CC;
  --color-light: #F2E2CE;
  --color-lightest: #FFF8E7;
  
  --color-text: #2d2d2d;
  --color-text-light: #666;
  --color-text-muted: #999;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-border: #e0e0e0;
  
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;
  --color-info: #17a2b8;
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 16px;
  --font-size-small: 14px;
  --font-size-large: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --border-radius-lg: 12px;
  --header-height: 88px;
  --bottom-nav-height: 72px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  
  --transition: all 0.3s ease;
  --transition-fast: all 0.15s ease;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: var(--transition);
  padding-top: var(--header-height);
  padding-bottom: var(--bottom-nav-height);
}

.icon {
  width: 20px;
  height: 20px;
  display: inline-block;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.icon-heart.is-active {
  fill: var(--color-danger);
  stroke: var(--color-danger);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}
.black-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 30px;
background-color: #000000;
z-index: 1001;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav__brand img {
  height: 80px;
  width: auto;
  display: block;
  object-fit: contain;
}

.nav__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

.nav__controls {
  display: flex;
  gap: var(--spacing-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  min-height: 44px;
  gap: var(--spacing-xs);
}

.btn__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn__label {
  font-weight: 600;
}

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

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

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

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

.btn--favorite {
  background: none;
  border: none;
  font-size: var(--font-size-large);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: 50%;
  transition: var(--transition);
}

.btn--favorite:hover {
  background-color: var(--color-accent);
  transform: scale(1.1);
}

.btn--favorite.active {
  color: var(--color-danger);
}

/* Main content */
.main {
  min-height: calc(100vh - 140px);
  padding: var(--spacing-xl) 0;
}

/* Hero section */
.hero {
  text-align: center;
  margin-bottom: var(--spacing-xxl);
}

.hero__title {
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.hero__description {
  font-size: var(--font-size-large);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* Tabs */
.tabs {
  display: flex;
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xs);
  margin-bottom: var(--spacing-xl);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  background: none;
  color: var(--color-text-light);
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: var(--transition);
  white-space: nowrap;
  min-width: 120px;
}

.tab:hover {
  background-color: var(--color-accent);
  color: var(--color-text);
}

.tab--active {
  background-color: var(--color-primary);
  color: white;
}

/* Tab content */
.tab-content {
  position: relative;
}

.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-panel--active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Section header */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

/* Filters */
.filters {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: var(--transition);
  min-width: 150px;
}

.filter-select:hover,
.filter-select:focus {
  border-color: var(--color-primary);
  outline: none;
}

/* Products grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  align-items: stretch;
}

.product-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  min-height: 220px;
  height: auto;
}

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

.product-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.product-card__title {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
  flex: 1;
}

.product-card__category {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-small);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.product-card__description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.product-card__meta,
.product-card__description {
  flex-shrink: 0;
}

.product-card__footer {
  margin-top: auto;
}

.product-card__tag {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-muted);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-small);
}

.product-card__price {
  font-size: var(--font-size-large);
  font-weight: 700;
  color: var(--color-primary);
  margin-top: var(--spacing-sm);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1200;
}

.modal.is-visible {
  display: flex;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}

.modal__dialog {
  position: relative;
  background: var(--color-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 520px;
  width: 90%;
  padding: var(--spacing-lg);
  z-index: 1;
}

.modal__close {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.modal__close:hover {
  background: var(--color-accent);
  border-color: var(--color-primary);
}

.modal__body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.modal__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.modal__section {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
}

.modal__section-title {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: var(--font-size-base);
  color: var(--color-primary);
}

.modal__text {
  margin: 0;
  color: var(--color-text-light);
  line-height: 1.5;
}

.modal__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.modal__tags .product-card__tag {
  background: var(--color-bg-secondary);
}

.modal-open {
  overflow: hidden;
}

/* Techniques grid */
.techniques-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.technique-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: var(--transition);
}

.technique-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.technique-icon {
  font-size: var(--font-size-xxl);
  margin-bottom: var(--spacing-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.technique-icon .icon {
  width: 28px;
  height: 28px;
}

.technique-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.technique-description {
  color: var(--color-text-light);
  line-height: 1.5;
}

/* Application tips */
.application-tips {
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.tips-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.tips-list {
  list-style: none;
  padding: 0;
}

.tips-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

.tips-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

/* Protection content */
.protection-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.protection-card {
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  border-left: 4px solid;
}

.protection-card--warning {
  background-color: rgba(255, 193, 7, 0.1);
  border-left-color: var(--color-warning);
}

.protection-card--info {
  background-color: rgba(23, 162, 184, 0.1);
  border-left-color: var(--color-info);
}

.protection-card--success {
  background-color: rgba(40, 167, 69, 0.1);
  border-left-color: var(--color-success);
}

.protection-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.protection-card ul {
  list-style: none;
  padding: 0;
}

.protection-card li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

.protection-card li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* Seasonal grid */
.seasonal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.seasonal-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: var(--transition);
}

.seasonal-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.seasonal-card--summer {
  border-top: 4px solid #ff6b35;
}

.seasonal-card--winter {
  border-top: 4px solid #4a90e2;
}

.seasonal-card--dry {
  border-top: 4px solid #f39c12;
}

.seasonal-icon {
  font-size: var(--font-size-xxl);
  margin-bottom: var(--spacing-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.seasonal-icon .icon {
  width: 28px;
  height: 28px;
}

.seasonal-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.seasonal-tips {
  list-style: none;
  padding: 0;
  text-align: left;
}

.seasonal-tips li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

.seasonal-tips li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--spacing-xxl);
  color: var(--color-text-muted);
}

.empty-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

.empty-icon .icon {
  width: 48px;
  height: 48px;
}

.empty-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.empty-description {
  font-size: var(--font-size-base);
  line-height: 1.5;
}

/* Footer */
.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xxl);
  margin-bottom: 60px;
}

.footer__text {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  margin: 0;
}

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

.footer__text a:hover {
  text-decoration: underline;
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background-color: rgba(255, 255, 255, 0.95);
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: center;
  padding: 0 var(--spacing-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 90;
  margin-bottom: 80px;
}

.bottom-nav__item {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--color-text-light);
  font-size: 12px;
  padding: var(--spacing-sm) var(--spacing-xs);
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
}

.bottom-nav__item .icon {
  width: 22px;
  height: 22px;
}

.bottom-nav__item--active {
  color: var(--color-primary);
  background-color: var(--color-bg-secondary);
}

.bottom-nav__item:hover {
  color: var(--color-primary);
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
}

.loading-text {
  color: white;
  font-size: var(--font-size-base);
  margin: 0;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Toast notifications */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  max-width: 300px;
  animation: slideIn 0.3s ease;
  position: relative;
}

.toast--success {
  border-left: 4px solid var(--color-success);
}

.toast--error {
  border-left: 4px solid var(--color-danger);
}

.toast--info {
  border-left: 4px solid var(--color-info);
}

.toast__message {
  color: var(--color-text);
  font-size: var(--font-size-small);
  margin: 0;
}

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

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  body {
    padding-top: 128px;
  }
  
  .nav {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav__title {
    font-size: var(--font-size-large);
  }
  
  .hero__title {
    font-size: var(--font-size-xl);
  }
  
  .hero__description {
    font-size: var(--font-size-base);
  }
  
  .tabs {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .tab {
    text-align: center;
  }
  
  .section-header {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filters {
    justify-content: stretch;
  }
  
  .filter-select {
    flex: 1;
  }
  
  .products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-sm);
  }
  
  .product-card {
    padding: var(--spacing-sm);
    min-height: 180px;
  }

  .product-card__title {
    font-size: var(--font-size-small);
  }

  .product-card__description {
    font-size: 13px;
    margin-bottom: var(--spacing-xs);
  }

  .product-card__meta {
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
  }

  .product-card__tag {
    font-size: 12px;
    padding: 2px 6px;
  }
  
  .techniques-grid {
    grid-template-columns: 1fr;
  }
  
  .protection-content {
    grid-template-columns: 1fr;
  }
  
  .seasonal-grid {
    grid-template-columns: 1fr;
  }
  
  .toast-container {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    left: var(--spacing-sm);
  }
  
  .toast {
    max-width: none;
  }
}

@media (max-width: 480px) {
  .hero {
    margin-bottom: var(--spacing-lg);
  }
  
  .main {
    padding: var(--spacing-lg) 0;
  }
  
  .products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-sm);
  }
  
  .product-card,
  .technique-card,
  .protection-card,
  .seasonal-card {
    padding: var(--spacing-sm);
  }
  
  .product-card {
    min-height: 160px;
  }
  
  .application-tips {
    padding: var(--spacing-md);
  }
}

/* Print styles */
@media print {
  .header,
  .footer,
  .btn,
  .tabs,
  .nav__controls {
    display: none;
  }
  
  .main {
    padding: 0;
  }
  
  .tab-panel {
    display: block !important;
  }
  
  .product-card,
  .technique-card,
  .protection-card,
  .seasonal-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000;
    --color-bg: #fff;
    --color-border: #000;
    --color-primary: #000;
  }
}

/* Focus styles for accessibility */
.btn:focus,
.tab:focus,
.filter-select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Smooth scrolling for reduced motion users */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}