/* -----------------------------------------------------------------
   Image Cleaner - Stylesheet
   Lightweight layout for image editing tool
   ----------------------------------------------------------------- */

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

:root {
  --bg-primary: #1e1e1e;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #3a3a3a;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent: #0078d4;
  --accent-hover: #106ebe;
  --border: #404040;
  --success: #107c10;
  --error: #e81123;
  --selection: rgba(0, 120, 212, 0.3);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

/* -----------------------------------------------------------------
   Layout
   ----------------------------------------------------------------- */

.app-container {
  display: grid;
  grid-template-columns: 200px 1fr 250px;
  grid-template-rows: 50px 1fr;
  height: 100vh;
  width: 100vw;
}

.header {
  grid-column: 1 / -1;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 20px;
}

.header h1 {
  font-size: 18px;
  font-weight: 600;
}

.header-controls {
  display: flex;
  gap: 10px;
  margin-left: auto;
}

.sidebar-left {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 15px;
}

.canvas-area {
  position: relative;
  background: var(--bg-primary);
  overflow: hidden;
}

.sidebar-right {
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 15px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* -----------------------------------------------------------------
   Toolbox
   ----------------------------------------------------------------- */

.toolbox {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toolbox h2 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.tool-button {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 15px;
  font-size: 14px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s, border-color 0.2s;
  text-align: left;
}

.tool-button:hover {
  background: var(--accent-hover);
  border-color: var(--accent);
}

.tool-button.active {
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

/* -----------------------------------------------------------------
   Options Panel
   ----------------------------------------------------------------- */

.options-panel h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.option-control {
  margin-bottom: 15px;
}

.option-control label {
  display: block;
  font-size: 13px;
  margin-bottom: 5px;
  color: var(--text-secondary);
}

.option-control input[type="range"] {
  width: 100%;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  outline: none;
  -webkit-appearance: none;
}

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

.option-control input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  cursor: pointer;
  border-radius: 50%;
  border: none;
}

.slider-value {
  float: right;
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 600;
}

.checkbox-label {
  display: flex;
  align-items: center;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
  margin-right: 8px;
  cursor: pointer;
}

.option-control input[type="text"] {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px;
  font-size: 13px;
  border-radius: 4px;
  margin-top: 5px;
}

.option-control input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

.action-button {
  width: 100%;
  background: var(--accent);
  border: none;
  color: white;
  padding: 10px 15px;
  font-size: 14px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s;
  font-weight: 600;
}

.action-button:hover {
  background: var(--accent-hover);
}

.action-button:active {
  transform: translateY(1px);
}

/* -----------------------------------------------------------------
   History Panel
   ----------------------------------------------------------------- */

.history-panel h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.history-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 15px;
}

.history-controls button {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  font-size: 12px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s;
}

.history-controls button:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent);
}

.history-controls button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.history-list {
  list-style: none;
  font-size: 12px;
}

.history-item {
  padding: 8px;
  margin-bottom: 4px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  border: 1px solid transparent;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-item.current {
  border-color: var(--accent);
  background: rgba(0, 120, 212, 0.1);
}

.history-time {
  color: var(--text-secondary);
  font-size: 11px;
}

/* -----------------------------------------------------------------
   Canvas Area
   ----------------------------------------------------------------- */

panner-zoomer {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
}

canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* -----------------------------------------------------------------
   Header Controls
   ----------------------------------------------------------------- */

.load-image-btn {
  background: var(--accent);
  border: none;
  color: white;
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s;
}

.load-image-btn:hover {
  background: var(--accent-hover);
}

#image-input {
  display: none;
}

/* -----------------------------------------------------------------
   Notifications
   ----------------------------------------------------------------- */

.notification {
  position: fixed;
  top: 70px;
  right: 20px;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
}

.notification.show {
  opacity: 1;
  transform: translateX(0);
}

.notification-success {
  border-left: 3px solid var(--success);
}

.notification-error {
  border-left: 3px solid var(--error);
}

.notification-info {
  border-left: 3px solid var(--accent);
}

/* -----------------------------------------------------------------
   Scrollbar
   ----------------------------------------------------------------- */

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border);
}