:root {
  --bg: #151515;
  --bg-alt: #1c1c1c;
  --bg-elevated: #242424;
  --bg-hover: #2e2e2e;
  --border: #2e2e2e;
  --text: #e0e0e0;
  --text-dim: #999;
  --text-muted: #666;
  --accent: #808080;
  --accent-hover: #a0a0a0;
  --danger: #cc4444;
  --danger-hover: #ee5555;
  --success: #4a8;
  --drop-glow: rgba(128, 128, 128, 0.12);
}

.light {
  --bg: #f5f5f5;
  --bg-alt: #eee;
  --bg-elevated: #fff;
  --bg-hover: #e8e8e8;
  --border: #d4d4d4;
  --text: #1a1a1a;
  --text-dim: #666;
  --text-muted: #999;
  --accent: #666;
  --accent-hover: #444;
  --danger: #c33;
  --danger-hover: #d44;
  --success: #3a7;
  --drop-glow: rgba(0, 0, 0, 0.06);
}

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

html {
  height: 100%;
}

body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.hidden {
  display: none !important;
}

#header {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
}

#dark-toggle {
  cursor: pointer;
  width: 40px;
  height: 22px;
  border-radius: 11px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 2px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  flex-shrink: 0;
}

.toggle-circle {
  display: block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform 0.25s ease, background-color 0.2s ease;
}

.light .toggle-circle {
  transform: translateX(18px);
}

#toggle-message {
  position: fixed;
  top: 48px;
  right: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-dim);
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

#toggle-message.visible {
  opacity: 1;
  transform: scale(1);
}

#main {
  flex: 1;
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px;
  width: 100%;
}

#dropzone {
  display: flex;
  justify-content: center;
  padding: 24px 16px;
  border: 2px dashed var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

#dropzone:hover {
  border-color: var(--text-muted);
}

#dropzone.active {
  border-color: var(--accent);
  background: var(--drop-glow);
}

.drop-inner {
  text-align: center;
}

.drop-icon {
  display: block;
  margin: 0 auto 8px;
  color: var(--text-muted);
}

.drop-text {
  font-size: 13px;
  color: var(--text-dim);
}

.drop-text label {
  color: var(--accent);
  cursor: pointer;
  font-weight: 500;
}

.drop-text label:hover {
  color: var(--accent-hover);
}

.drop-ext {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

#image-section {
  margin-top: 16px;
}

#image-section h2 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

#image-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.image-card {
  display: flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  gap: 10px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.image-card img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 2px;
  flex-shrink: 0;
}

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

.image-name {
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.image-size {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.image-reduction {
  font-size: 11px;
  color: var(--success);
  font-weight: 500;
}

.image-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  border-radius: 3px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.btn-download:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 3px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.15s ease;
}

.btn-remove:hover {
  color: var(--danger-hover);
}

#controls {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
  transition: border-color 0.3s ease;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.control-group label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.control-group select,
.control-group input[type="range"] {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  font-size: 13px;
  padding: 5px 8px;
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.control-group select {
  min-width: 90px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23999'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 24px;
}

.control-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.control-group input[type="range"] {
  padding: 0;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--bg-hover);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  width: 120px;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  transition: background-color 0.15s ease;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--accent-hover);
}

.control-group input[type="range"]:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.quality-value {
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
}

.control-group.disabled {
  opacity: 0.4;
  pointer-events: none;
}

#btn-process {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 16px;
  border-radius: 3px;
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
  white-space: nowrap;
  height: 32px;
}

#btn-process:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

#btn-process:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 480px) {
  .header-inner {
    padding: 6px 12px;
  }

  #main {
    padding: 12px 12px;
  }

  #controls {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .control-group input[type="range"] {
    width: 100%;
  }

  .image-card {
    flex-wrap: wrap;
  }
}