/*=============================================
  GLOBAL STYLES & ROOT VARIABLES
=============================================*/
:root {
  /* Colors */
  --bg-primary: #0a0a14;
  --bg-secondary: #141428;
  --bg-element: #1f1f3d;
  --accent-primary: #6c5ce7;
  --accent-secondary: #a29bfe;
  --text-primary: #f5f5f5;
  --text-secondary: #a0a0c0;
  --error-color: #ff4757;
  --success-color: #2ecc71;
  --warning-color: #ffa726;
  --border-color: rgba(162, 155, 254, 0.2);
}

html {
  scroll-behavior: smooth;
}

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

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

body.modal-open {
  overflow: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 5px;
  border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-secondary);
}

/*=============================================
  ANIMATIONS
=============================================*/
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/*=============================================
  LAYOUT & CONTAINER
=============================================*/
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/*=============================================
  SITE HEADER & FOOTER
=============================================*/
.site-header {
  position: sticky;
  user-select: none;
  top: 0;
  z-index: 100;
  background-color: rgba(20, 20, 40, 0.5);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.site-footer {
  margin-top: 4rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.site-header .container, .site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}
.logo i {
  margin-right: 0.5rem;
}

.site-nav a, .footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: 1.5rem;
  transition: color 0.3s ease;
}
.site-nav a:hover, .footer-links a:hover {
  color: var(--text-primary);
}
.site-nav a.nav-button {
  background: var(--accent-primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.3s ease;
}
.site-nav a.nav-button:hover {
  opacity: 0.9;
  cursor: pointer;
}

.nav-link-hidden {
  display: none !important;
}

/*=============================================
  PAGE HEADER & CONTENT CARDS
=============================================*/
.page-header {
  text-align: center;
  margin: 2rem 0 3rem;
}

.title {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 300;
}

.content-card {
  background: var(--bg-element);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid var(--border-color);
}

.content-card h3 {
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  color: var(--accent-primary);
}

/*=============================================
  UPLOAD AREA
=============================================*/
.upload-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.upload-card {
  background: var(--bg-element);
  border-radius: 16px;
  padding: 1rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}
.upload-card:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 8px 32px rgba(108, 92, 231, 0.2);
}

.upload-area {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 2px dashed var(--accent-secondary);
  border-radius: 12px;
  transition: all 0.3s ease;
  padding: 0.5rem;
}
.upload-area.drag-over {
  border-color: var(--accent-primary);
  background: rgba(108, 92, 231, 0.2);
}

.upload-content {
  text-align: center;
}
.upload-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.7;
  color: var(--accent-primary);
}
.upload-content p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/*=============================================
  IMAGE PREVIEW
=============================================*/
.image-preview {
  position: relative;
  width: 100%;
  height: 300px;
  border-radius: 8px;
  overflow: hidden;
}
.image-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--bg-secondary);
}

.remove-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 10;
  width: 30px;
  height: 30px;
  background: var(--error-color);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}
.remove-btn:hover {
  background: #ff3742;
  transform: scale(1.1);
}

.file-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(15, 15, 26, 0.9);
  padding: 0.75rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.file-info div {
  margin-bottom: 2px;
}

/*=============================================
  BUTTONS & ACTIONS
=============================================*/
.compare-section {
  text-align: center;
  margin-bottom: 2rem;
}
.compare-btn {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border: none;
  padding: 1rem 3rem;
  border-radius: 50px;
  font-size: 1.2rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}
.compare-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(108, 92, 231, 0.4);
}
.compare-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.compare-btn.comparing {
  animation: pulse 2s infinite;
}

.stop-btn {
  background: var(--error-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
}
.stop-btn:hover {
  background: #ff3742;
}
.stop-btn i {
    margin-right: 0.5rem;
}

/*=============================================
  PROGRESS & RESULTS
=============================================*/
.progress-section, .results-section, .metadata-section {
  margin-bottom: 2rem;
}

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

.progress-header h3 {
    margin-bottom: 0;
}

.progress-bar {
  position: relative;
  height: 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 6px;
  transition: width 0.3s ease;
}
.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
}
.progress-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  color: var(--text-secondary);
}
.progress-details span {
  color: var(--text-primary);
  font-weight: 600;
}
.real-time-similarity {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-align: center;
}
.real-time-similarity h4 {
  color: var(--text-secondary);
}
.similarity-value {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}
.result-item {
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-align: center;
}
.result-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.result-value {
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
}
.similarity-score {
  font-size: 2rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.diff-icon {
  color: var(--accent-primary);
  cursor: pointer;
  transition: color 0.3s ease;
}
.diff-icon:hover {
  color: var(--accent-secondary);
}

/*=============================================
  METADATA TABLE
=============================================*/
.metadata-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.metadata-table th, .metadata-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--bg-secondary);
  vertical-align: middle;
}
.metadata-table th {
  color: var(--accent-primary);
  font-weight: 600;
}
.metadata-table td {
  color: var(--text-secondary);
}
.metadata-table .prop-name {
  color: var(--text-primary);
  font-weight: 500;
}
.metadata-table .value-col {
  word-break: break-all;
}
.metadata-table .status-col {
  text-align: center;
}
.status-icon {
  font-size: 1.2rem;
}
.status-icon.success { color: var(--success-color); }
.status-icon.warning { color: var(--warning-color); }
.size-diff {
  display: block;
  font-size: 0.8rem;
  margin-top: 4px;
  color: var(--warning-color);
}

/*=============================================
  MODAL STYLES (GENERAL)
=============================================*/
.modal-overlay {
  position: fixed;
  z-index: 1000;
  inset: 0;
  background-color: rgba(10, 10, 20, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  animation: fadeIn 0.3s ease-out;
}
.modal-content-fullscreen {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  background: rgba(31, 31, 61, 0.75);
  backdrop-filter: blur(15px) saturate(120%);
  -webkit-backdrop-filter: blur(15px) saturate(120%);
  border-radius: 24px;
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  overflow: hidden;
}
.modal-header {
  position: relative;
  flex-shrink: 0;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-color);
}
.modal-header h3 {
  color: var(--text-primary);
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}
.modal-header h3 i {
  margin-right: 0.75rem;
  color: var(--accent-primary);
}
.modal-header p {
  color: var(--text-secondary);
  margin-bottom: 0;
  font-size: 0.9rem;
}
.modal-close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}
.modal-close-btn:hover {
  background: var(--accent-primary);
  color: white;
  transform: rotate(90deg);
}
.modal-body {
  flex-grow: 1;
  overflow-y: auto;
  padding: 1rem 2rem;
}
.modal-footer {
  flex-shrink: 0;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border-color);
  background: rgba(10, 10, 20, 0.3);
  text-align: right;
}
.modal-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}
.modal-btn-primary:hover {
  opacity: 0.9;
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

/*=============================================
  MODAL SPECIFICS (DIFF MAP & SETTINGS)
=============================================*/
.modal-canvas-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  width: 100%;
  background: var(--bg-secondary);
  border-radius: 8px;
  overflow: auto;
}
#diff-canvas {
  max-width: 100%;
  max-height: 100%;
  image-rendering: pixelated;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.settings-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.setting-item {
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  background: var(--bg-secondary);
  border-radius: 12px;
}
.setting-item > label {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
.setting-item #threshold-value {
  font-weight: 700;
  color: var(--accent-secondary);
}
.setting-description {
  flex-grow: 1;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.setting-item-row {
  flex-direction: row;
  justify-content: space-between;
}

/*=============================================
  CUSTOM FORM CONTROLS
=============================================*/
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: var(--bg-primary);
  outline: none;
  border-radius: 4px;
  opacity: 0.7;
  transition: opacity .2s, background .2s;
}
.slider:hover {
  opacity: 1;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent-primary);
  cursor: pointer;
  border-radius: 50%;
  border: 2px solid var(--bg-element);
  transition: background-color 0.3s ease;
}
.slider::-webkit-slider-thumb:hover {
  background-color: var(--accent-secondary);
}

.custom-color-input {
  display: flex;
  align-items: center;
  width: 100%;
  height: 44px;
  padding: 5px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
}
.custom-color-input input[type="color"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.color-swatch {
  width: 100%;
  height: 100%;
  pointer-events: none;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.custom-checkbox-container {
    display: block;
    position: relative;
    padding-left: 35px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    color: var(--text-primary);
}
.custom-checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
.custom-checkbox-container label {
    cursor: pointer;
}
.custom-checkbox-container label::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0px;
    height: 22px;
    width: 22px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.2s ease;
}
.custom-checkbox-container input:checked ~ label::before {
    background-color: var(--accent-primary);
    border-color: var(--accent-secondary);
}
.custom-checkbox-container label::after {
    content: "";
    position: absolute;
    display: none;
    left: 7px;
    top: 3px;
    width: 6px;
    height: 12px;
    border: solid white;
    border-width: 0 3px 3px 0;
    transform: rotate(45deg);
}
.custom-checkbox-container input:checked ~ label::after {
    display: block;
}

.region-visualizer {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
  margin-bottom: 1rem;
  background: var(--bg-primary);
  border-radius: 8px;
  overflow: hidden;
}
.region-preview {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
#region-preview-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.region-preview-text {
  color: var(--text-secondary);
}
.region-box {
  position: absolute;
  background: rgba(108, 92, 231, 0.5);
  border: 2px solid var(--accent-secondary);
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.region-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.region-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.region-group label {
  font-weight: 600;
  color: var(--text-secondary);
}
.region-group input[type="number"] {
  width: 100%;
  padding: 0.5rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  appearance: textfield;
  -moz-appearance: textfield;
}
.region-group input::-webkit-outer-spin-button,
.region-group input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.region-group span {
  color: var(--text-secondary);
}

/*=============================================
  RESPONSIVE ADJUSTMENTS
=============================================*/
@media (max-width: 992px) {
  .settings-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .modal-overlay { padding: 1rem; }
  .modal-header, .modal-body, .modal-footer { padding: 1.5rem; }
  .site-header .container {
    flex-direction: column;
    gap: 1rem;
  }
  .upload-section {
    grid-template-columns: 1fr;
  }
  .title {
    font-size: 2.5rem;
  }
  .progress-details, .results-grid, .region-inputs, .setting-item-row {
    grid-template-columns: 1fr;
    flex-direction: column;
  }
  .metadata-table {
    display: block;
    overflow-x: auto;
  }
}