/* ============================================
   Image WebP Converter - CSS
   ============================================ */

/* Light Mode Variables */
.image-webp-converter-container {
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --border-color: #333;
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #888;
  --color-accent: #3498db;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #9b59b6;
  --shadow-sm: 2px 2px 0 rgba(0,0,0,0.1);
  --shadow-md: 3px 3px 0 rgba(0,0,0,0.15);
  --input-focus-bg: #fffacd;
  --title-color: #2c3e50;
  --highlight-bg: #e8f5e9;
}

/* Dark Mode - Manual Toggle */
.image-webp-converter-container.dark {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --border-color: #e0e0e0;
  --text-primary: #e8e8e8;
  --text-secondary: #b0b0b0;
  --text-light: #808080;
  --color-accent: #5dade2;
  --color-success: #52c77a;
  --color-warning: #f5b041;
  --color-danger: #ec7063;
  --color-purple: #af7ac5;
  --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
  --shadow-md: 3px 3px 0 rgba(255,255,255,0.1);
  --input-focus-bg: #3a3a3a;
  --title-color: #7fb3d5;
  --highlight-bg: #1e3a20;
}

/* System Dark Mode Auto Detection */
@media (prefers-color-scheme: dark) {
  .image-webp-converter-container:not(.dark):not(.light) {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --border-color: #e0e0e0;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #808080;
    --color-accent: #5dade2;
    --color-success: #52c77a;
    --color-warning: #f5b041;
    --color-danger: #ec7063;
    --color-purple: #af7ac5;
    --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
    --shadow-md: 3px 3px 0 rgba(255,255,255,0.1);
    --input-focus-bg: #3a3a3a;
    --title-color: #7fb3d5;
    --highlight-bg: #1e3a20;
  }
}

/* Box Sizing */
.image-webp-converter-container,
.image-webp-converter-container *,
.image-webp-converter-container *::before,
.image-webp-converter-container *::after {
  box-sizing: border-box;
}

/* Main Container */
.image-webp-converter-container {
  position: relative;
  max-width: 920px;
  width: 100%;
  margin: 8px auto;
  padding: 8px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic', sans-serif;
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  line-height: 1.4;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 5px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  z-index: 10;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s;
}

.dark-mode-toggle:hover {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 rgba(0,0,0,0.1);
}

.dark-mode-toggle:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

/* Header */
.converter-header {
  text-align: center;
  padding-bottom: 8px;
  margin-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
}

.converter-header h2 {
  margin: 0 0 4px 0;
  font-size: 26px;
  font-weight: 700;
  color: var(--title-color);
}

.subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--text-light);
}

/* Main Grid */
.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 8px;
}

/* Sections */
.input-section,
.result-section {
  background: var(--bg-secondary);
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  box-shadow: var(--shadow-sm);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 6px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.section-header svg {
  stroke: var(--color-accent);
  flex-shrink: 0;
}

.section-header .btn-download-all {
  margin-left: auto;
  padding: 5px 12px;
  background: var(--color-accent);
  color: #fff;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s;
}

.section-header .btn-download-all:hover {
  transform: translate(0.5px, 0.5px);
}

.section-header .btn-download-all:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: 5px;
  padding: 16px 10px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-primary);
  margin-bottom: 8px;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--color-accent);
  background: var(--input-focus-bg);
}

.upload-icon {
  font-size: 32px;
  margin-bottom: 6px;
}

.drop-zone p {
  margin: 0 0 6px 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.upload-link {
  background: none;
  border: none;
  color: var(--color-accent);
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
  font-size: 15px;
  padding: 0;
}

.upload-help {
  font-size: 13px;
  color: var(--text-light);
}

/* Uploaded Files */
.uploaded-files {
  border: 1px solid var(--border-color);
  border-radius: 5px;
  background: var(--bg-primary);
  margin-bottom: 8px;
}

.files-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
}

.btn-clear-files {
  background: var(--color-warning);
  color: #fff;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 3px 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 1px 1px 0 rgba(0,0,0,0.1);
}

.btn-clear-files:hover {
  filter: brightness(1.1);
}

.file-list {
  max-height: 110px;
  overflow-y: auto;
  padding: 6px;
}

.no-files-message {
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
  padding: 10px;
  font-style: italic;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-bottom: 4px;
}

.file-item:last-child {
  margin-bottom: 0;
}

.file-thumb {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-primary);
}

.file-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.file-meta {
  font-size: 13px;
  color: var(--text-light);
}

.file-remove {
  background: none;
  border: none;
  color: var(--color-danger);
  cursor: pointer;
  font-size: 16px;
  padding: 0 4px;
  opacity: 0.7;
}

.file-remove:hover {
  opacity: 1;
}

/* Quality Control */
.quality-control {
  margin-bottom: 8px;
}

.quality-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.quality-header label {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.quality-value-display {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.quality-level {
  padding: 2px 8px;
  background: var(--color-success);
  color: #fff;
  border-radius: 3px;
  font-size: 12px;
  font-weight: 700;
}

.quality-level.low { background: var(--color-danger); }
.quality-level.medium { background: var(--color-warning); }
.quality-level.high { background: var(--color-success); }
.quality-level.ultra { background: var(--color-purple); }

.quality-number {
  width: 48px;
  padding: 3px 6px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  font-family: 'Courier New', monospace;
}

.quality-number:focus {
  outline: none;
  background: var(--input-focus-bg);
}

/* Quality Slider */
.quality-slider {
  width: 100%;
  height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(to right, 
    var(--color-danger) 0%, 
    var(--color-danger) 40%,
    var(--color-warning) 40%, 
    var(--color-warning) 70%,
    var(--color-success) 70%, 
    var(--color-success) 90%,
    var(--color-purple) 90%, 
    var(--color-purple) 100%);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
}

.quality-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.quality-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
}

.quality-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

.quality-guide {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  padding: 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.guide-item {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 3px;
  color: #fff;
}

.guide-item.low { background: var(--color-danger); }
.guide-item.medium { background: var(--color-warning); }
.guide-item.high { background: var(--color-success); }
.guide-item.ultra { background: var(--color-purple); }

/* Convert Button */
.convert-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px;
  background: var(--color-success);
  color: #fff;
  border: 1.5px solid var(--border-color);
  border-radius: 5px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 3px 3px 0 rgba(0,0,0,0.2);
  transition: transform 0.1s;
}

.convert-btn:hover:not(:disabled) {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

.convert-btn:active:not(:disabled) {
  transform: translate(3px, 3px);
  box-shadow: none;
}

.convert-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 8px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.stat-item.highlight {
  background: var(--highlight-bg);
  border-color: var(--color-success);
}

.stat-label {
  font-size: 12px;
  color: var(--text-light);
  font-weight: 600;
}

.stat-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

.stat-item.highlight .stat-value {
  color: var(--color-success);
}

/* Results List */
.results-list {
  max-height: 260px;
  overflow-y: auto;
}

.no-results {
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
  padding: 24px 10px;
  font-style: italic;
}

/* Result Item */
.result-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  margin-bottom: 6px;
}

.result-item:last-child {
  margin-bottom: 0;
}

.result-thumb {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-secondary);
}

.result-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.result-info {
  flex: 1;
  min-width: 0;
}

.result-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.result-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
}

.result-saved {
  color: var(--color-success);
  font-weight: 700;
}

.result-saved.negative {
  color: var(--color-danger);
}

.btn-download {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.1s;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  flex-shrink: 0;
}

.btn-download:hover {
  transform: translate(0.5px, 0.5px);
}

/* Info Section */
.info-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 8px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}

.info-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.info-icon {
  font-size: 16px;
}

.privacy-notice {
  padding: 10px;
  background: var(--highlight-bg);
  border: 1px solid var(--color-success);
  border-radius: 4px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.privacy-notice strong {
  color: var(--color-success);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 10px 18px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: all 0.25s;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast-msg {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Responsive - Tablet */
@media (max-width: 768px) {
  .image-webp-converter-container {
    margin: 6px 4px;
    padding: 6px;
    width: calc(100% - 8px);
  }

  .main-grid {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .converter-header h2 {
    font-size: 22px;
  }

  .info-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .quality-guide {
    flex-wrap: wrap;
    gap: 4px;
  }

  .guide-item {
    flex: 1 1 45%;
    text-align: center;
  }
}

/* Responsive - Mobile */
@media (max-width: 480px) {
  .image-webp-converter-container {
    padding: 5px;
    border-width: 1px;
  }

  .converter-header h2 {
    font-size: 20px;
  }

  .subtitle {
    font-size: 13px;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .info-grid {
    grid-template-columns: 1fr 1fr;
  }

  .quality-guide {
    flex-direction: column;
    gap: 3px;
  }

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