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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

:root {
  /* Modern Dark Theme Colors */
  --vscode-bg: #0d1117;
  --vscode-sidebar-bg: #161b22;
  --vscode-titlebar-bg: #21262d;
  --vscode-editor-bg: #0d1117;
  --vscode-panel-bg: #161b22;
  --vscode-border: #30363d;
  --vscode-input-bg: #21262d;
  --vscode-input-border: #30363d;
  --vscode-button-bg: #238636;
  --vscode-button-hover-bg: #2ea043;
  --vscode-text: #e6edf3;
  --vscode-text-secondary: #8b949e;
  --vscode-accent: #58a6ff;
  --vscode-success: #3fb950;
  --vscode-error: #f85149;
  --vscode-warning: #d29922;
  --vscode-scrollbar: #30363d;
  --vscode-scrollbar-hover: #484f58;
  
  /* Modern additions */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --gradient-primary: linear-gradient(135deg, #238636 0%, #2ea043 100%);
  --gradient-accent: linear-gradient(135deg, #58a6ff 0%, #79c0ff 100%);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Inter', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--vscode-bg);
  color: var(--vscode-text);
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* Modern Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--vscode-scrollbar);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--vscode-scrollbar-hover);
  background-clip: padding-box;
}

/* App Layout */
.app {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--vscode-bg);
  overflow: hidden;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.app-titlebar {
  height: 40px;
  min-height: 40px;
  background: linear-gradient(180deg, var(--vscode-titlebar-bg) 0%, #1a1f28 100%);
  border-bottom: 1px solid var(--vscode-border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  flex-shrink: 0;
  user-select: none;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.titlebar-icon {
  font-size: 16px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.titlebar-logo {
  height: 20px;
  width: auto;
  object-fit: contain;
}

.titlebar-title {
  font-size: 14px;
  color: var(--vscode-text);
  font-weight: 600;
  flex: 1;
  letter-spacing: -0.02em;
}

.titlebar-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.menu-btn {
  padding: 6px 16px;
  background: transparent;
  border: 1px solid var(--vscode-border);
  border-radius: 6px;
  color: var(--vscode-text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.menu-btn:hover:not(:disabled) {
  background: var(--vscode-input-bg);
  border-color: var(--vscode-accent);
  color: var(--vscode-text);
  transform: translateY(-1px);
}

.menu-btn.active {
  background: var(--vscode-accent);
  border-color: var(--vscode-accent);
  color: white;
  box-shadow: 0 2px 4px rgba(88, 166, 255, 0.3);
}

.menu-btn.active:hover {
  background: #79c0ff;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(88, 166, 255, 0.4);
}

.menu-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--vscode-panel-bg);
  color: var(--vscode-text-secondary);
  border-color: var(--vscode-border);
}

.menu-btn:disabled:hover {
  transform: none;
  background: var(--vscode-panel-bg);
  border-color: var(--vscode-border);
  color: var(--vscode-text-secondary);
}

.cli-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
}

.cli-status .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--vscode-text-secondary);
}

.cli-status.success .status-dot {
  background: var(--vscode-success);
}

.cli-status.error .status-dot {
  background: var(--vscode-error);
}

.driver-banner {
  background: linear-gradient(135deg, rgba(255, 152, 0, 0.15) 0%, rgba(255, 152, 0, 0.25) 100%);
  border-bottom: 2px solid #ff9800;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(255, 152, 0, 0.2);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.driver-banner-content {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1400px;
  width: 100%;
  justify-content: center;
}

.driver-banner-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.driver-banner-text {
  flex: 1;
  color: var(--vscode-text);
  font-size: 14px;
  line-height: 1.5;
}

.driver-banner-text strong {
  color: #ff9800;
  font-weight: 600;
}

.driver-banner-btn {
  padding: 10px 20px;
  background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
  border: none;
  border-radius: 6px;
  color: white;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(255, 152, 0, 0.3);
  flex-shrink: 0;
}

.driver-banner-btn:hover {
  background: linear-gradient(135deg, #f57c00 0%, #e65100 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(255, 152, 0, 0.4);
}

.driver-banner-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(255, 152, 0, 0.3);
}

.driver-banner-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Settings Page Styles */
.settings-page {
  max-width: 1400px;
  width: 100%;
  padding: 32px;
  margin: 0 auto;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 24px;
  width: 100%;
}

.settings-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--vscode-border);
}

.settings-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--vscode-text);
  margin: 0 0 8px 0;
}

.settings-subtitle {
  font-size: 14px;
  color: var(--vscode-text-secondary);
  margin: 0;
}

.settings-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.settings-content.settings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 24px;
  width: 100%;
}

.settings-section {
  background: var(--vscode-panel-bg);
  border: 1px solid var(--vscode-border);
  border-radius: 8px;
  padding: 24px;
}

.settings-section-header {
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--vscode-border);
}

.settings-section-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--vscode-text);
  margin: 0;
}

.settings-item {
  margin-bottom: 20px;
}

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

.settings-item label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--vscode-text);
  margin-bottom: 8px;
}

.settings-info {
  font-size: 14px;
  color: var(--vscode-text-secondary);
  padding: 8px 12px;
  background: var(--vscode-input-bg);
  border: 1px solid var(--vscode-input-border);
  border-radius: 6px;
}

.settings-select {
  width: 100%;
  padding: 8px 12px;
  background: var(--vscode-input-bg);
  border: 1px solid var(--vscode-input-border);
  border-radius: 6px;
  color: var(--vscode-text);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.settings-select:hover {
  border-color: var(--vscode-accent);
}

.settings-select:focus {
  outline: none;
  border-color: var(--vscode-accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

.settings-item label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.settings-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--vscode-accent);
}

/* Combo Board Visualization */
.combo-board-frame {
  position: relative;
  width: 100%;
  min-height: 160px;
  border: 3px solid #000;
  background: var(--vscode-input-bg);
  border-radius: 4px;
  padding: 24px 12px 24px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: visible;
}

.combo-board-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.combo-board-row-top {
  margin-bottom: auto;
}

.combo-board-row-bottom {
  margin-top: auto;
}

.combo-led {
  flex: 1;
  max-width: 40px;
  height: 32px;
  border-radius: 6px;
  border: 2px solid #ff0000;
  background: #1a1a1a;
  transition: all 0.3s ease;
  position: relative;
  cursor: default;
}

.combo-led::before {
  content: attr(data-bit);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 9px;
  color: var(--vscode-text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

.combo-board-row-top .combo-led::before {
  top: -24px;
}

.combo-board-row-bottom .combo-led::before {
  bottom: -24px;
  top: auto;
}

.combo-led.off {
  background: #1a1a1a;
  border-color: #ff0000;
  box-shadow: inset 0 0 4px rgba(0, 0, 0, 0.8);
}

.combo-led.on {
  background: #00ff00;
  border-color: #00ff00;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.8), inset 0 0 6px rgba(0, 255, 0, 0.4);
}

.combo-led.unknown {
  background: #2a2a2a;
  border-color: #666666;
  opacity: 0.6;
}

.combo-board-display {
  flex: 0 0 auto;
  height: 50px;
  border: 2px solid #000;
  background: var(--vscode-panel-bg);
  border-radius: 4px;
  margin: 8px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.combo-board-display-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px;
}

.combo-board-label-top,
.combo-board-label-bottom {
  font-size: 11px;
  font-weight: 700;
  color: var(--vscode-text);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.combo-board-status {
  margin-top: 4px;
  padding: 4px 8px;
  text-align: center;
}

.combo-board-status .status-text {
  font-size: 10px;
  color: var(--vscode-text-secondary);
  font-style: italic;
}

.combo-board-status.active .status-text {
  color: var(--vscode-success);
  font-style: normal;
}

.combo-board-status.inactive .status-text {
  color: var(--vscode-text-secondary);
}

.app-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0;
}

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  height: 100%;
}

/* Sidebar */
.sidebar {
  background: var(--vscode-sidebar-bg);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
}

.sidebar-left {
  width: 300px;
  border-right: 1px solid var(--vscode-border);
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
}

.sidebar-right {
  width: 400px;
  border-left: 1px solid var(--vscode-border);
  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.2);
}

.sidebar.collapsed {
  width: 48px !important;
}

.sidebar-header {
  padding: 10px 12px;
  border-bottom: 1px solid var(--vscode-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: linear-gradient(180deg, var(--vscode-titlebar-bg) 0%, var(--vscode-sidebar-bg) 100%);
}

.sidebar-toggle {
  background: transparent;
  border: none;
  color: var(--vscode-text);
  cursor: pointer;
  padding: 6px 10px;
  font-size: 16px;
  border-radius: 6px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-toggle:hover {
  background: var(--vscode-input-bg);
  transform: scale(1.05);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar.collapsed .sidebar-content {
  display: none;
}

.sidebar-resizer {
  width: 4px;
  cursor: col-resize;
  background: transparent;
  transition: background 0.2s;
  flex-shrink: 0;
}

.sidebar-resizer:hover {
  background: var(--vscode-accent);
}

/* Board Image */
.board-image-container {
  width: 100%;
  padding: 20px;
  background: linear-gradient(135deg, var(--vscode-panel-bg) 0%, #1c2128 100%);
  border-bottom: 1px solid var(--vscode-border);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.board-image-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(88, 166, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.board-image {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 12px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-md);
}

.board-image.connected {
  filter: drop-shadow(0 0 6px rgba(63, 185, 80, 0.5)) drop-shadow(0 0 12px rgba(63, 185, 80, 0.2));
  transform: scale(1.02);
  animation: glow-green 2s ease-in-out infinite;
}

.board-image.disconnected {
  filter: drop-shadow(0 0 6px rgba(248, 81, 73, 0.5)) drop-shadow(0 0 12px rgba(248, 81, 73, 0.2));
  animation: glow-red 2s ease-in-out infinite;
}

@keyframes glow-green {
  0%, 100% {
    filter: drop-shadow(0 0 6px rgba(63, 185, 80, 0.5)) drop-shadow(0 0 12px rgba(63, 185, 80, 0.2));
  }
  50% {
    filter: drop-shadow(0 0 10px rgba(63, 185, 80, 0.7)) drop-shadow(0 0 18px rgba(63, 185, 80, 0.4));
  }
}

@keyframes glow-red {
  0%, 100% {
    filter: drop-shadow(0 0 6px rgba(248, 81, 73, 0.5)) drop-shadow(0 0 12px rgba(248, 81, 73, 0.2));
  }
  50% {
    filter: drop-shadow(0 0 10px rgba(248, 81, 73, 0.7)) drop-shadow(0 0 18px rgba(248, 81, 73, 0.4));
  }
}

.sidebar.collapsed .board-image-container {
  display: none;
}

/* Setup Page */
.setup-page {
  padding: 16px;
}

.setup-section {
  margin-bottom: 20px;
  background: var(--vscode-panel-bg);
  border: 1px solid var(--vscode-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.setup-section:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--vscode-accent);
}

.section-header {
  padding: 14px 18px;
  background: linear-gradient(135deg, var(--vscode-titlebar-bg) 0%, #1a1f28 100%);
  border-bottom: 1px solid var(--vscode-border);
}

.section-header h3 {
  font-size: 11px;
  font-weight: 700;
  color: var(--vscode-text);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.setup-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--vscode-border);
}

.setup-item:last-child {
  border-bottom: none;
}

.setup-item label {
  display: block;
  font-size: 12px;
  color: var(--vscode-text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.port-selector-group {
  display: flex;
  gap: 6px;
  width: 100%;
}

.port-select,
.board-select,
.baud-select {
  flex: 1;
  min-width: 0;
  padding: 8px 12px;
  background: var(--vscode-input-bg);
  border: 1px solid var(--vscode-input-border);
  border-radius: 6px;
  color: var(--vscode-text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 500;
}

.port-select:hover,
.board-select:hover,
.baud-select:hover {
  border-color: var(--vscode-accent);
  background: #252a33;
}

.port-select:focus,
.board-select:focus,
.baud-select:focus {
  outline: none;
  border-color: var(--vscode-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

.port-select.flash-warning {
  animation: flashYellow 0.5s ease-in-out 3;
  border-color: #ff9800;
}

@keyframes flashYellow {
  0%, 100% {
    background-color: var(--vscode-input-bg);
    border-color: #ff9800;
  }
  50% {
    background-color: rgba(255, 152, 0, 0.3);
    border-color: #ff9800;
  }
}

.port-warning {
  margin-top: 6px;
  padding: 6px 8px;
  background: rgba(255, 152, 0, 0.2);
  border: 1px solid #ff9800;
  border-radius: 3px;
  color: #ff9800;
  font-size: 12px;
  font-weight: 500;
  animation: flashText 0.5s ease-in-out 3;
}

@keyframes flashText {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.02);
  }
}

.btn-scan {
  padding: 8px 14px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 6px;
  color: white;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s ease;
  min-width: 42px;
  flex-shrink: 0;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.btn-scan:hover:not(:disabled) {
  background: var(--vscode-button-hover-bg);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-scan:active:not(:disabled) {
  transform: translateY(0);
}

.btn-driver {
  width: 100%;
  padding: 8px 12px;
  background: var(--vscode-button-secondaryBackground);
  border: 1px solid var(--vscode-button-border);
  border-radius: 6px;
  color: var(--vscode-button-secondaryForeground);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s ease;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.btn-driver:hover:not(:disabled) {
  background: var(--vscode-button-secondaryHoverBackground);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-driver:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

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

.driver-help {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.driver-status {
  padding: 8px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  line-height: 1.4;
}

.driver-status-info {
  background: rgba(88, 166, 255, 0.15);
  border: 1px solid rgba(88, 166, 255, 0.3);
  color: #58a6ff;
}

.driver-status-success {
  background: rgba(56, 193, 114, 0.15);
  border: 1px solid rgba(56, 193, 114, 0.3);
  color: #38c172;
}

.driver-status-error {
  background: rgba(248, 81, 73, 0.15);
  border: 1px solid rgba(248, 81, 73, 0.3);
  color: #f85149;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--vscode-text-secondary);
  transition: all 0.3s ease;
  position: relative;
}

.status-dot.connected {
  background: var(--vscode-success);
  box-shadow: 0 0 8px rgba(63, 185, 80, 0.6), 0 0 16px rgba(63, 185, 80, 0.3);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.1);
  }
}

.about-text {
  padding: 12px 16px;
}

.about-text p {
  margin: 0 0 8px 0;
  font-size: 13px;
}

.about-text .version {
  font-size: 11px;
  color: var(--vscode-text-secondary);
}

.about-text .description {
  font-size: 12px;
  color: var(--vscode-text-secondary);
  margin-top: 12px;
  line-height: 1.5;
}

/* Code Editor */
.code-editor {
  background: var(--vscode-editor-bg);
  border: 1px solid var(--vscode-border);
  display: flex;
  flex-direction: column;
  flex: 1;
  width: 100%;
  min-height: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--vscode-border);
}

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: linear-gradient(180deg, var(--vscode-titlebar-bg) 0%, #1a1f28 100%);
  border-bottom: 1px solid var(--vscode-border);
  box-shadow: var(--shadow-sm);
}

.editor-header h2 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--vscode-text);
}

.editor-actions {
  display: flex;
  gap: 6px;
}

.btn-sm {
  padding: 4px 12px;
  font-size: 12px;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-outline {
  background: var(--vscode-input-bg);
  color: var(--vscode-text);
  border: 1px solid var(--vscode-border);
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  background: var(--vscode-panel-bg);
  border-color: var(--vscode-accent);
  color: var(--vscode-accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.board-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--vscode-panel-bg);
  border-bottom: 1px solid var(--vscode-border);
}

.board-selector label {
  font-size: 12px;
  color: var(--vscode-text-secondary);
}

.editor-board-select {
  padding: 6px 12px;
  border: 1px solid var(--vscode-input-border);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  background: var(--vscode-input-bg);
  color: var(--vscode-text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.editor-board-select:hover {
  border-color: var(--vscode-accent);
  background: #252a33;
}

.editor-board-select:focus {
  outline: none;
  border-color: var(--vscode-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

.editor-board-select option:disabled {
  color: var(--vscode-text-secondary);
  background: var(--vscode-panel-bg);
  opacity: 0.6;
}

.editor-container {
  flex: 1;
  width: 100%;
  min-height: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--vscode-border);
}

.upload-status {
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 500;
  border-bottom: 1px solid var(--vscode-border);
  border-radius: 0;
  transition: all 0.3s ease;
}

.upload-status.info {
  background: linear-gradient(90deg, rgba(88, 166, 255, 0.15) 0%, transparent 100%);
  color: #79c0ff;
  border-left: 3px solid var(--vscode-accent);
}

.upload-status.success {
  background: linear-gradient(90deg, rgba(63, 185, 80, 0.15) 0%, transparent 100%);
  color: var(--vscode-success);
  border-left: 3px solid var(--vscode-success);
}

.upload-status.error {
  background: linear-gradient(90deg, rgba(248, 81, 73, 0.15) 0%, transparent 100%);
  color: var(--vscode-error);
  border-left: 3px solid var(--vscode-error);
}

.upload-actions {
  padding: 12px 16px;
  background: var(--vscode-panel-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.btn-upload {
  width: auto;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  background: var(--gradient-accent);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
  letter-spacing: 0.02em;
  align-self: flex-start;
}

.btn-upload:hover:not(:disabled) {
  background: var(--vscode-accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-upload:active:not(:disabled) {
  transform: translateY(0);
}

.btn-upload:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-upload.flash-warning {
  animation: flashYellow 0.5s ease-in-out 3;
  box-shadow: 0 0 10px rgba(255, 193, 7, 0.8);
}

.btn-upload.flash-warning {
  animation: flashYellow 0.5s ease-in-out 3;
  box-shadow: 0 0 10px rgba(255, 193, 7, 0.8);
}

.upload-note {
  margin-top: 8px;
  font-size: 11px;
  color: var(--vscode-text-secondary);
  text-align: center;
}

/* Serial Monitor */
.serial-monitor {
  background: linear-gradient(180deg, var(--vscode-panel-bg) 0%, #0f1419 100%);
  display: flex;
  flex-direction: column;
  width: 100%;
  flex: 0 0 300px;
  min-height: 250px;
  padding: 20px;
  overflow: hidden;
  border-top: 1px solid var(--vscode-border);
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.2);
}

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

.monitor-header h2 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--vscode-text);
}

.monitor-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  cursor: pointer;
  user-select: none;
}

.monitor-content {
  flex: 1;
  background: #0a0d12;
  color: #c9d1d9;
  border-radius: 8px;
  padding: 16px;
  overflow-y: auto;
  overflow-x: hidden;
  font-family: 'SF Mono', 'Consolas', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.7;
  min-height: 0;
  margin-bottom: 1rem;
  border: 1px solid var(--vscode-border);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.monitor-empty {
  color: var(--vscode-text-secondary);
  text-align: center;
  padding: 2rem;
}

.monitor-line {
  margin-bottom: 0.25rem;
  word-wrap: break-word;
}

.monitor-timestamp {
  color: #888;
  margin-right: 0.5rem;
  font-size: 0.85em;
}

.monitor-input-section {
  margin-top: auto;
}

.monitor-input-form {
  display: flex;
  gap: 6px;
}

.monitor-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--vscode-input-border);
  border-radius: 8px;
  background: var(--vscode-input-bg);
  color: var(--vscode-text);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.monitor-input:focus {
  outline: none;
  border-color: var(--vscode-accent);
  background: #252a33;
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

.btn-send {
  padding: 6px 12px;
  white-space: nowrap;
}

/* Sidebar Tabs */
.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--vscode-border);
  background: var(--vscode-titlebar-bg);
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--vscode-text-secondary);
  cursor: pointer;
  font-size: 12px;
}

.tab-btn:hover {
  color: var(--vscode-text);
  background: var(--vscode-input-bg);
}

.tab-btn.active {
  color: var(--vscode-text);
  border-bottom-color: var(--vscode-accent);
  background: var(--vscode-panel-bg);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Curriculum Page */
.curriculum-page {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  height: 100%;
}

.curriculum-header {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--vscode-border);
  flex-shrink: 0;
}

.curriculum-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--vscode-text);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.curriculum-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}

.curriculum-loading {
  text-align: center;
  color: var(--vscode-text-secondary);
  padding: 20px;
}

.curriculum-level {
  background: var(--vscode-panel-bg);
  border: 1px solid var(--vscode-border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.curriculum-level:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--vscode-accent);
}

.curriculum-level-header {
  padding: 14px 18px;
  background: linear-gradient(135deg, var(--vscode-titlebar-bg) 0%, #1a1f28 100%);
  border-bottom: 1px solid var(--vscode-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.curriculum-level-header.bronze {
  border-left: 5px solid #cd7f32;
  background: linear-gradient(135deg, rgba(205, 127, 50, 0.15) 0%, var(--vscode-titlebar-bg) 100%);
}

.curriculum-level-header.silver {
  border-left: 5px solid #c0c0c0;
  background: linear-gradient(135deg, rgba(192, 192, 192, 0.15) 0%, var(--vscode-titlebar-bg) 100%);
}

.curriculum-level-header.gold {
  border-left: 5px solid #ffd700;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15) 0%, var(--vscode-titlebar-bg) 100%);
}

.curriculum-level-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--vscode-text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex: 1;
}

.curriculum-lessons {
  padding: 8px;
}

.curriculum-lesson {
  padding: 12px 16px;
  margin: 6px 0;
  background: var(--vscode-input-bg);
  border: 1px solid var(--vscode-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.curriculum-lesson::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--gradient-accent);
  transition: width 0.3s ease;
  opacity: 0.1;
}

.curriculum-lesson:hover {
  background: var(--vscode-panel-bg);
  border-color: var(--vscode-accent);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.curriculum-lesson:hover::before {
  width: 4px;
}

.curriculum-lesson.active {
  background: linear-gradient(90deg, rgba(88, 166, 255, 0.15) 0%, var(--vscode-panel-bg) 100%);
  border-color: var(--vscode-accent);
  border-left: 4px solid var(--vscode-accent);
  box-shadow: var(--shadow-sm);
}

.curriculum-lesson.active::before {
  width: 4px;
  opacity: 1;
}

.curriculum-lesson-number {
  font-weight: 600;
  color: var(--vscode-accent);
  font-size: 12px;
  min-width: 60px;
}

.curriculum-lesson-title {
  flex: 1;
  font-size: 12px;
  color: var(--vscode-text);
}

.curriculum-lesson-code {
  font-size: 11px;
  color: var(--vscode-text-secondary);
  font-family: 'Courier New', monospace;
}

/* Worksheet Viewer */
.worksheet-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  height: 100%;
}

.curriculum-list {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  height: 100%;
}

/* Curriculum Item (Top Level) */
.curriculum-item {
  padding: 16px 18px;
  margin: 8px 0;
  background: var(--vscode-panel-bg);
  border: 1px solid var(--vscode-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.curriculum-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--gradient-accent);
  transition: width 0.3s ease;
  opacity: 0.1;
}

.curriculum-item:hover {
  background: var(--vscode-input-bg);
  border-color: var(--vscode-accent);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.curriculum-item:hover::before {
  width: 4px;
}

.curriculum-item-icon {
  font-size: 24px;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--vscode-input-bg);
  border-radius: 8px;
}

.curriculum-item-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.curriculum-item-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--vscode-accent);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.5px;
}

.curriculum-item-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--vscode-text);
}

/* Curriculum Selected Header */
.curriculum-selected-header {
  padding: 16px 18px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--vscode-titlebar-bg) 0%, #1a1f28 100%);
  border: 1px solid var(--vscode-border);
  border-radius: 10px;
  border-left: 5px solid var(--vscode-accent);
}

.curriculum-selected-code {
  font-size: 14px;
  font-weight: 700;
  color: var(--vscode-accent);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.curriculum-selected-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--vscode-text);
}

/* Curriculum Back Button */
.curriculum-back-button {
  padding: 10px 16px;
  margin-bottom: 12px;
  background: var(--vscode-input-bg);
  border: 1px solid var(--vscode-border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--vscode-text);
  transition: all 0.2s ease;
  text-align: center;
}

.curriculum-back-button:hover {
  background: var(--vscode-panel-bg);
  border-color: var(--vscode-accent);
  color: var(--vscode-accent);
  transform: translateX(-2px);
}

.worksheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--vscode-titlebar-bg);
  border-bottom: 1px solid var(--vscode-border);
  flex-shrink: 0;
}

.worksheet-title-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.worksheet-title-section h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--vscode-text);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.worksheet-code {
  font-size: 12px;
  color: var(--vscode-text-secondary);
  font-family: 'Courier New', monospace;
  background: var(--vscode-input-bg);
  padding: 4px 8px;
  border-radius: 3px;
}

.worksheet-content {
  flex: 1 1 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  color: var(--vscode-text);
  -webkit-overflow-scrolling: touch;
  position: relative;
  height: 0;
}

.worksheet-section {
  margin-bottom: 24px;
}

.worksheet-section h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--vscode-accent);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.worksheet-description {
  font-size: 14px;
  line-height: 1.6;
  color: var(--vscode-text);
  margin-bottom: 12px;
}

.worksheet-section p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--vscode-text);
  margin-bottom: 8px;
}

.worksheet-list {
  margin: 12px 0;
  padding-left: 20px;
}

.worksheet-list li {
  font-size: 13px;
  line-height: 1.8;
  color: var(--vscode-text);
  margin-bottom: 8px;
}

.worksheet-video {
  margin: 12px 0;
}

.worksheet-video-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--gradient-accent);
  border-radius: 8px;
  transition: all 0.2s ease;
  font-size: 13px;
  font-weight: 600;
  color: white;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.worksheet-video-link:hover {
  background: var(--vscode-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.worksheet-video-link span {
  font-size: 16px;
}

.worksheet-code-block {
  background: #0a0d12;
  border: 1px solid var(--vscode-border);
  border-radius: 10px;
  padding: 20px;
  margin: 16px 0;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3), var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.worksheet-code-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0.5;
}

.worksheet-code-block pre {
  margin: 0 0 12px 0;
  padding: 0;
  overflow-x: auto;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--vscode-text);
}

.worksheet-code-block code {
  font-family: 'Consolas', 'Courier New', monospace;
  color: #d4d4d4;
}

.worksheet-load-code {
  margin-top: 8px;
}

/* Mobile responsive: stack everything vertically */
@media (max-width: 900px) {
  .app-titlebar { flex-wrap: wrap; height: auto; padding: 12px; gap: 8px; }
  .titlebar-menu { flex-wrap: wrap; width: 100%; }
  .menu-btn { flex: 1 1 auto; }

  .app-header { flex-direction: column; align-items: flex-start; gap: 12px; height: auto; padding: 12px; }
  .header-controls { flex-direction: column; align-items: flex-start; gap: 8px; width: 100%; }

  .app-container { display: flex; flex-direction: column; gap: 12px; }
  .sidebar-resizer { display: none !important; }
  .sidebar, #leftSidebar, #rightSidebar { width: 100% !important; max-width: 100% !important; }
  .app-main { width: 100%; }
  .code-editor, .serial-monitor, .curriculum-page { width: 100%; }
}

@media (max-width: 600px) {
  .logo-img { height: 32px; }
  .worksheet-content { max-height: 50vh; }
}