/**
 * Apple.com-Inspired Design System
 * Clean, minimalist design with subtle interactions
 */

/* CSS Variables - Apple-inspired color palette */
:root {
  /* Neutrals */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E8E8E8;
  --color-gray-300: #E1E1E1;
  --color-gray-500: #999999;
  --color-gray-600: #6E6E6E;
  --color-gray-700: #4D4D4D;
  --color-gray-900: #1D1D1F;

  /* Accent */
  --color-blue: #0071E3;
  --color-blue-hover: #005BB5;
  --color-blue-light: #E3F2FD;
  --color-blue-dark: #005BB5;
  
  /* Status Colors */
  --color-green: #34c759;
  --color-green-light: #e7f9ed;
  --color-red: #ff3b30;
  --color-red-light: #ffe5e5;
  
  /* Layout */
  --max-width: 1200px;
  --nav-height: 60px;
  --section-padding: 60px 0;
  --border-radius: 12px;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Lexend Deca', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Shadows */
  --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.05);
  --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-heavy: 0 8px 40px rgba(0, 0, 0, 0.12);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--color-gray-700);
  background-color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-black);
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
}

p {
  margin-bottom: 1em;
  font-size: 1.1rem;
  line-height: 1.7;
}

/* Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-gray-300);
  z-index: 1000;
  height: var(--nav-height);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-black);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-menu a {
  position: relative;
  text-decoration: none;
  color: var(--color-gray-700);
  font-weight: 400;
  font-size: 1rem;
  transition: color 0.2s ease;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--color-blue);
  transition: width 0.25s ease;
}

.nav-menu a:hover {
  color: var(--color-black);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-gray-700);
}

/* Main Content */
.content {
  margin-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 6rem 2rem 4rem;
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-100) 100%);
}

.hero h1 {
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-gray-700) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-gray-500);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--color-blue);
  color: var(--color-white);
  box-shadow: var(--shadow-light);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--color-blue-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background: var(--color-gray-100);
  border-color: var(--color-gray-500);
  transform: translateY(-1px);
}

/* Button Sizes */
.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Button with Icon */
.btn-icon {
  margin-right: 0.25rem;
}

/* Tool Container */
.tool-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem;
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  margin-bottom: 2rem;
}

/* Upload Area */
.upload-area {
  border: 2px dashed var(--color-gray-300);
  border-radius: var(--border-radius);
  padding: 4rem 2rem;
  text-align: center;
  background: var(--color-gray-100);
  transition: all 0.3s ease;
  cursor: pointer;
}

.upload-area:hover {
  border-color: var(--color-blue);
  background: var(--color-blue-light);
}

.upload-area.drag-over {
  border-color: var(--color-blue);
  background: var(--color-blue-light);
  transform: scale(1.02);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.7;
}

/* Features Grid */
.features {
  padding: var(--section-padding);
  background: var(--color-white);
}

.features-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.features h2 {
  text-align: center;
  margin-bottom: 3rem;
}

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

.feature-card {
  text-align: center;
  padding: 2rem;
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.feature-card h3 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--color-gray-500);
  font-size: 1rem;
}

/* Footer */
.site-footer {
  background: var(--color-gray-100);
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--color-gray-300);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--color-gray-500);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--color-gray-700);
}

.footer-copyright {
  color: var(--color-gray-500);
  font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--color-gray-300);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero {
    padding: 4rem 1rem 3rem;
  }
  
  .tool-container {
    margin: 1rem;
    padding: 1.5rem;
  }
  
  .upload-area {
    padding: 3rem 1rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* Loading States */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-content {
  text-align: center;
  padding: 2rem;
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-gray-300);
  border-top-color: var(--color-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

/* Thumbnails Gallery */
.thumbnails-section {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 2rem;
    box-shadow: var(--shadow-light);
}

.thumbnails-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.thumbnails-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

.thumbnails-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.thumbnails-count {
    font-size: 0.875rem;
    color: var(--color-gray-600);
}

.thumbnails-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 1rem;
    max-height: 200px;
    overflow-y: auto;
    padding: 0.25rem;
}

.thumbnail-item {
    position: relative;
    aspect-ratio: 1;
    background: var(--color-gray-100);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.thumbnail-item:hover {
    border-color: var(--color-blue);
    transform: scale(1.05);
}

.thumbnail-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.thumbnail-item .remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 20px;
    height: 20px;
    background: rgba(255, 59, 48, 0.9);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
}

.thumbnail-item:hover .remove-btn {
    opacity: 1;
}

.thumbnail-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    font-size: 10px;
    padding: 2px 4px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.thumbnail-item:hover .thumbnail-name {
    opacity: 1;
}

/* Preview Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1050;
    padding: 1.5rem;
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--border-radius);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--color-gray-200);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-gray-600);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
}

.modal-body {
    padding: 2rem;
}

.preview-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.preview-item {
    text-align: center;
}

.preview-item h3 {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
}

.preview-image {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    margin-bottom: 1rem;
}

.preview-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: var(--color-gray-600);
}

/* Results Section */
.results-section {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 2rem;
    box-shadow: var(--shadow-light);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

.results-stats {
    display: flex;
    gap: 2rem;
}

.results-stats .stat {
    text-align: center;
}

.results-stats .stat span:first-child {
    display: block;
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: 0.25rem;
}

.results-stats .stat span:last-child {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.result-item {
    background: var(--color-gray-50);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.result-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.result-header {
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-gray-200);
}

.result-filename {
    font-weight: 500;
    color: var(--color-gray-900);
    font-size: 0.875rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    margin-right: 0.5rem;
}

.result-status {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
}

.result-status.success {
    background: var(--color-green-light);
    color: var(--color-green);
}

.result-status.error {
    background: var(--color-red-light);
    color: var(--color-red);
}

/* Result Preview */
.result-preview {
    width: 100%;
    height: 150px;
    object-fit: cover;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.result-preview:hover {
    opacity: 0.9;
}

.result-stats {
    padding: 1rem;
    background: var(--color-white);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.result-stat {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
}

.result-stat span:first-child {
    color: var(--color-gray-600);
}

.result-stat-value {
    font-weight: 500;
    color: var(--color-gray-900);
}

.result-actions {
    padding: 1rem;
    display: flex;
    gap: 0.5rem;
    background: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
}

.result-actions .btn {
    flex: 1;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-blue);
  color: var(--color-white);
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  z-index: 100;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 0;
}

/* Breadcrumb Navigation */
.breadcrumb {
  padding: 0.75rem 1rem;
  background: var(--color-gray-100);
  border-bottom: 1px solid var(--color-gray-300);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: var(--max-width);
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
  content: "›";
  margin: 0 0.5rem;
  color: var(--color-gray-500);
  font-size: 1.1rem;
}

.breadcrumb-link {
  color: var(--color-gray-600);
  text-decoration: none;
  transition: color 0.2s ease;
  font-size: 0.875rem;
}

.breadcrumb-link:hover {
  color: var(--color-blue);
  text-decoration: underline;
}

.breadcrumb-current {
  color: var(--color-black);
  font-weight: 500;
  font-size: 0.875rem;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

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

/* Scroll-triggered animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }