/* ============================================================================
   KIRKLAND NIKE SB DUNK LOW DROP TRACKER - MAIN STYLESHEET
   ============================================================================

   Design Philosophy:
   - Bold serif typography inspired by Costco's warehouse aesthetic
   - Clean white background with high contrast black text
   - Red accents for urgency and emphasis (Costco brand colors)
   - Mobile-first responsive design
   - WCAG 2.1 AA accessible

   Author: Kirkland Scraper Project
   Version: 1.0
   Last Updated: 2025-10-25
   ========================================================================== */

/* ============================================================================
   1. FONT IMPORTS
   ========================================================================== */

/* Google Fonts - Merriweather (Costco-inspired serif) */
@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@400;700;900&display=swap');

/* ============================================================================
   2. CSS RESET & BOX-SIZING
   ========================================================================== */

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

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

body {
  line-height: 1.5;
  overflow-x: hidden;
}

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

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

a {
  text-decoration: none;
  color: inherit;
}

/* ============================================================================
   3. CSS CUSTOM PROPERTIES (VARIABLES)
   ========================================================================== */

:root {
  /* Color Palette */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-costco-red: #E31837;
  --color-costco-red-dark: #B01329;
  --color-gray-dark: #333333;
  --color-gray-medium: #4A4A4A;
  --color-gray-light: #F5F5F5;
  --color-gray-text: #666666;
  --color-text-dark: #1A1A1A;
  --color-text-medium: #2A2A2A;

  /* State Colors */
  --color-success: #006B3F;
  --color-warning: #F7B500;
  --color-error: #E31837;

  /* Typography */
  --font-serif: 'Merriweather', 'Georgia', 'Century Schoolbook', 'Baskerville', serif;

  /* Font Sizes */
  --font-size-h1: 48px;
  --font-size-h2: 32px;
  --font-size-countdown: 72px;
  --font-size-countdown-label: 14px;
  --font-size-date: 36px;
  --font-size-source-name: 20px;
  --font-size-source-date: 24px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-confidence: 18px;

  /* Price Sign Font Sizes */
  --font-size-item-number: 36px;
  --font-size-product-name: 28px;
  --font-size-price-label: 18px;
  --font-size-price-amount: 120px;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 40px;
  --spacing-xxl: 60px;

  /* Layout */
  --container-max-width: 1400px;
  --container-padding: 40px;

  /* Border */
  --border-width: 2px;
  --border-color: var(--color-gray-dark);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* Mobile Font Sizing */
@media (max-width: 767px) {
  :root {
    --font-size-h1: 32px;
    --font-size-h2: 24px;
    --font-size-countdown: 48px;
    --font-size-countdown-label: 12px;
    --font-size-date: 28px;
    --font-size-source-name: 18px;
    --font-size-source-date: 20px;
    --font-size-item-number: 28px;
    --font-size-product-name: 22px;
    --font-size-price-amount: 80px;
    --container-padding: 16px;
  }

  html {
    font-size: 14px;
  }
}

/* Tablet Font Sizing */
@media (min-width: 768px) and (max-width: 1199px) {
  :root {
    --font-size-h1: 42px;
    --font-size-countdown: 64px;
    --font-size-item-number: 32px;
    --font-size-product-name: 26px;
    --font-size-price-amount: 100px;
    --container-padding: 32px;
  }
}

/* Large Desktop Font Sizing */
@media (min-width: 1200px) {
  html {
    font-size: 18px;
  }
}

/* ============================================================================
   4. TYPOGRAPHY SYSTEM
   ========================================================================== */

body {
  font-family: var(--font-serif);
  font-size: var(--font-size-body);
  color: var(--color-black);
  background-color: var(--color-white);
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  line-height: 1.2;
}

h2 {
  font-size: var(--font-size-h2);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.3;
}

p {
  line-height: 1.6;
}

strong {
  font-weight: 700;
}

/* ============================================================================
   5. CONTAINER & LAYOUT STYLES
   ========================================================================== */

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

main {
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-xxl);
}

/* ============================================================================
   6. HERO SECTION STYLES
   ========================================================================== */

.hero {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: fadeIn var(--transition-slow) ease-in;
}

.hero-image {
  max-width: 600px;
  width: 100%;
  margin: 0 auto var(--spacing-lg);
  filter: drop-shadow(var(--shadow-sm));
}

@media (max-width: 767px) {
  .hero-image {
    max-width: 400px;
  }
}

@media (min-width: 768px) and (max-width: 1199px) {
  .hero-image {
    max-width: 500px;
  }
}

.title {
  margin-bottom: var(--spacing-sm);
  color: var(--color-black);
}

.subtitle {
  font-size: var(--font-size-source-date);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-medium);
}

@media (max-width: 767px) {
  .subtitle {
    font-size: 18px;
  }
}

/* ============================================================================
   7. COUNTDOWN TIMER STYLES
   ========================================================================== */

.countdown-section {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: slideUp 0.8s ease-out 0.3s both;
}

.countdown {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

/* Mobile: 2x2 Grid Layout */
@media (max-width: 767px) {
  .countdown {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 10px;
    max-width: 300px;
    margin: 0 auto var(--spacing-lg);
  }
}

.countdown-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.countdown-number {
  font-size: var(--font-size-countdown);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -2px;
  color: var(--color-black);
  min-width: 80px;
  text-align: center;
}

@media (max-width: 767px) {
  .countdown-number {
    min-width: 60px;
  }
}

.countdown-label {
  font-size: var(--font-size-countdown-label);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-medium);
}

.countdown-separator {
  font-size: var(--font-size-countdown);
  font-weight: 700;
  color: var(--color-gray-medium);
  margin: 0 -10px;
}

@media (max-width: 767px) {
  .countdown-separator {
    display: none;
  }
}

/* Countdown States */
.countdown.urgent .countdown-number {
  color: var(--color-costco-red);
  animation: pulse 2s ease-in-out infinite;
}

.countdown.warning .countdown-number {
  color: var(--color-warning);
}

.countdown.expired .countdown-number {
  color: var(--color-gray-medium);
}

.predicted-date {
  font-size: var(--font-size-date);
  font-weight: 700;
  color: var(--color-black);
}

.predicted-date strong {
  color: var(--color-costco-red);
  padding: 4px 12px;
  background-color: rgba(227, 24, 55, 0.1);
  border-radius: 4px;
}

@media (max-width: 767px) {
  .predicted-date {
    font-size: 24px;
  }
}

/* ============================================================================
   8. COSTCO PRICE SIGN STYLES (Matching price.png)
   ========================================================================== */

.price-section {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.costco-price-sign {
  background-color: var(--color-white);
  padding: 40px 30px;
  max-width: 450px;
  margin: 30px auto;
  position: relative;
  font-family: var(--font-serif);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

@media (max-width: 767px) {
  .costco-price-sign {
    max-width: 90%;
    padding: 30px 20px;
  }
}

.costco-price-sign .item-number {
  font-size: var(--font-size-item-number);
  color: var(--color-text-dark);
  font-weight: 400;
  margin-bottom: 10px;
  letter-spacing: 1px;
  text-align: left;
}

.costco-price-sign .product-name {
  font-size: var(--font-size-product-name);
  font-weight: 700;
  color: var(--color-text-medium);
  text-transform: uppercase;
  line-height: 1.2;
  margin-bottom: 30px;
  letter-spacing: 0.5px;
  text-align: left;
}

.costco-price-sign .price-section {
  margin-bottom: 0;
}

.costco-price-sign .price-display {
  text-align: right;
  margin-top: 40px;
}

.costco-price-sign .price-label {
  font-size: var(--font-size-price-label);
  color: var(--color-gray-medium);
  text-transform: uppercase;
  font-variant: small-caps;
  letter-spacing: 1px;
  margin-bottom: 5px;
}

.costco-price-sign .price-amount {
  font-size: var(--font-size-price-amount);
  font-weight: 700;
  color: var(--color-black);
  line-height: 1;
  letter-spacing: -2px;
}

.price-disclaimer {
  text-align: center;
  font-size: var(--font-size-small);
  color: var(--color-gray-text);
  font-style: italic;
  margin-top: 10px;
}

/* ============================================================================
   9. CONFIDENCE INDICATOR STYLES
   ========================================================================== */

.confidence-section {
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  padding: var(--spacing-md);
  text-align: center;
}

.confidence-bar {
  width: 100%;
  height: 20px;
  background-color: var(--color-gray-light);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
  border: 1px solid var(--color-gray-dark);
}

@media (max-width: 767px) {
  .confidence-bar {
    height: 16px;
  }
}

.confidence-fill {
  height: 100%;
  background-color: var(--color-success);
  transition: width var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  color: var(--color-white);
  font-size: 12px;
  font-weight: 700;
}

/* Confidence color states */
.confidence-fill.high {
  background-color: var(--color-success);
}

.confidence-fill.medium {
  background-color: var(--color-warning);
}

.confidence-fill.low {
  background-color: var(--color-error);
}

.confidence-text {
  font-size: var(--font-size-confidence);
  font-weight: 700;
  color: var(--color-black);
}

.confidence-percentage {
  color: var(--color-costco-red);
  font-size: 24px;
}

.confidence-details {
  font-size: var(--font-size-small);
  color: var(--color-gray-text);
  margin-top: var(--spacing-xs);
}

/* ============================================================================
   10. SOURCE CARD STYLES
   ========================================================================== */

.sources-section {
  margin-bottom: var(--spacing-xxl);
}

.sources-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-black);
}

.sources-grid {
  display: grid;
  gap: var(--spacing-sm);
  margin-top: 30px;
}

/* ============================================================================
   11. SOURCE GRID LAYOUT (Responsive)
   ========================================================================== */

/* Mobile: 1 column */
@media (max-width: 767px) {
  .sources-grid {
    grid-template-columns: 1fr;
  }
}

/* Tablet: 2 columns */
@media (min-width: 768px) and (max-width: 1199px) {
  .sources-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

/* Desktop: 3 columns */
@media (min-width: 1200px) {
  .sources-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
  }
}

/* Large desktop: 4 columns if many sources */
@media (min-width: 1600px) {
  .sources-grid.many-sources {
    grid-template-columns: repeat(4, 1fr);
  }
}

.source-card {
  background-color: var(--color-white);
  border: var(--border-width) solid var(--border-color);
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
  animation: fadeIn 0.4s ease-out both;
}

/* Stagger animation for cards */
.source-card:nth-child(1) { animation-delay: 0.1s; }
.source-card:nth-child(2) { animation-delay: 0.2s; }
.source-card:nth-child(3) { animation-delay: 0.3s; }
.source-card:nth-child(4) { animation-delay: 0.4s; }
.source-card:nth-child(5) { animation-delay: 0.5s; }
.source-card:nth-child(6) { animation-delay: 0.6s; }

.source-card:hover {
  background-color: var(--color-gray-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@media (hover: none) {
  .source-card:hover {
    transform: none;
    box-shadow: none;
  }
}

.source-name {
  font-size: var(--font-size-source-name);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: var(--spacing-sm);
  color: var(--color-black);
  letter-spacing: 0.5px;
}

.source-date {
  font-size: var(--font-size-source-date);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-medium);
}

.source-date.high-confidence {
  color: var(--color-costco-red);
}

.source-meta {
  font-size: var(--font-size-small);
  color: var(--color-gray-text);
  margin-bottom: var(--spacing-xs);
}

.source-confidence {
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.source-confidence.high {
  color: var(--color-success);
}

.source-confidence.medium {
  color: var(--color-warning);
}

.source-confidence.low {
  color: var(--color-error);
}

.source-link {
  display: inline-block;
  color: var(--color-costco-red);
  font-size: var(--font-size-small);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: var(--spacing-sm);
  position: relative;
  transition: color var(--transition-fast);
}

.source-link::after {
  content: ' →';
  margin-left: 4px;
}

.source-link:hover {
  color: var(--color-costco-red-dark);
  text-decoration: underline;
}

/* Touch-friendly tap targets */
@media (max-width: 767px) {
  .source-link {
    min-height: 44px;
    min-width: 44px;
    padding: 12px 0;
    display: inline-flex;
    align-items: center;
  }
}

/* ============================================================================
   12. PRODUCT DETAIL CAROUSEL STYLES
   ========================================================================== */

.product-details {
  margin-bottom: var(--spacing-xxl);
  text-align: center;
}

.detail-carousel {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: var(--spacing-md) 0;
}

@media (max-width: 767px) {
  .detail-carousel {
    max-width: 100%;
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }
}

.detail-carousel img {
  max-width: 400px;
  height: auto;
  scroll-snap-align: center;
  transition: transform var(--transition-normal);
  filter: drop-shadow(var(--shadow-sm));
}

@media (max-width: 767px) {
  .detail-carousel img {
    max-width: 300px;
  }
}

@media (min-width: 768px) {
  .detail-carousel img:hover {
    transform: scale(1.02);
  }
}

.detail-caption {
  font-size: var(--font-size-small);
  color: var(--color-gray-text);
  font-style: italic;
  margin-top: var(--spacing-sm);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================================
   13. FOOTER STYLES
   ========================================================================== */

.footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-gray-light);
  margin-top: var(--spacing-xxl);
  color: var(--color-gray-text);
}

.update-info {
  font-size: var(--font-size-small);
  margin-bottom: var(--spacing-sm);
}

#last-update {
  font-weight: 700;
  color: var(--color-black);
}

.disclaimer {
  font-size: var(--font-size-small);
  font-style: italic;
  color: var(--color-gray-text);
  max-width: 600px;
  margin: 0 auto;
}

.refresh-indicator {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background-color: var(--color-white);
  border: var(--border-width) solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-small);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.refresh-indicator.loading {
  border-color: var(--color-costco-red);
}

.refresh-button {
  background-color: transparent;
  color: var(--color-costco-red);
  font-weight: 700;
  cursor: pointer;
  padding: 4px 8px;
  transition: all var(--transition-fast);
}

.refresh-button:hover {
  color: var(--color-costco-red-dark);
  transform: rotate(180deg);
}

.refresh-button.spinning {
  animation: spin 1s linear infinite;
}

/* ============================================================================
   14. UTILITY CLASSES
   ========================================================================== */

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Skip to Content Link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-costco-red);
  color: var(--color-white);
  padding: 8px 16px;
  text-decoration: none;
  z-index: 100;
  font-weight: 700;
}

.skip-to-content:focus {
  top: 0;
}

/* Text Alignment */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

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

/* Display Utilities */
.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* Spacing Utilities */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

/* ============================================================================
   15. ANIMATION KEYFRAMES
   ========================================================================== */

/* Fade In Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Slide Up Animation */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Pulse Animation (for urgent countdown) */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

/* Spin Animation (for loading/refresh) */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Highlight Flash (for new data) */
@keyframes highlightFlash {
  0% {
    background-color: transparent;
  }
  50% {
    background-color: rgba(247, 181, 0, 0.3);
  }
  100% {
    background-color: transparent;
  }
}

.highlight-flash {
  animation: highlightFlash 1s ease-out;
}

/* Progress Bar Fill */
@keyframes fillProgress {
  from {
    width: 0%;
  }
  to {
    width: var(--target-width);
  }
}

/* ============================================================================
   16. FOCUS STATES & ACCESSIBILITY
   ========================================================================== */

/* Focus Visible for keyboard navigation */
a:focus-visible,
button:focus-visible,
.source-card:focus-visible {
  outline: 3px solid var(--color-costco-red);
  outline-offset: 2px;
}

/* Remove default focus outline on mouse click */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --border-width: 3px;
  }

  .countdown-number {
    text-shadow: 1px 1px 0 var(--color-white);
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .countdown.urgent .countdown-number {
    animation: none;
  }
}

/* ============================================================================
   17. PRINT STYLES
   ========================================================================== */

@media print {
  .refresh-indicator,
  .source-link,
  .detail-carousel {
    display: none;
  }

  body {
    color: var(--color-black);
    background: var(--color-white);
  }

  .container {
    max-width: 100%;
  }

  .source-card {
    break-inside: avoid;
  }
}

/* ============================================================================
   18. LOADING STATES
   ========================================================================== */

.loading {
  opacity: 0.6;
  pointer-events: none;
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-gray-light) 0%,
    #e0e0e0 50%,
    var(--color-gray-light) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ============================================================================
   19. ERROR STATES
   ========================================================================== */

.error-message {
  background-color: rgba(227, 24, 55, 0.1);
  border: 2px solid var(--color-costco-red);
  color: var(--color-costco-red);
  padding: var(--spacing-md);
  text-align: center;
  font-weight: 700;
  margin: var(--spacing-md) 0;
}

.error-message::before {
  content: '⚠️ ';
  margin-right: var(--spacing-xs);
}

/* ============================================================================
   END OF STYLESHEET
   ========================================================================== */