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

:root {
  --ui-bg: #1a1a2e;
  --ui-surface: #16213e;
  --ui-border: #0f3460;
  --ui-text: #e0e0e0;
  --ui-text-muted: #a0a0b0;
  --ui-accent: #e94560;
  --ui-accent-hover: #ff6b81;
  --ui-panel-bg: #1c1c3a;
  --ui-input-bg: #0f0f23;
  --toolbar-height: 56px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--ui-bg);
  color: var(--ui-text);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--toolbar-height);
  padding: 0 20px;
  background: var(--ui-surface);
  border-bottom: 1px solid var(--ui-border);
}

.toolbar-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.toolbar-actions {
  display: flex;
  gap: 8px;
}

.btn {
  padding: 8px 16px;
  border: 1px solid var(--ui-border);
  border-radius: 6px;
  background: var(--ui-panel-bg);
  color: var(--ui-text);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--ui-border);
  border-color: var(--ui-accent);
}

/* Workspace */
.workspace {
  display: flex;
  height: calc(100vh - var(--toolbar-height));
}

/* Panels */
.panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-panel {
  flex: 3;
  border-right: 1px solid var(--ui-border);
}

.preview-panel {
  flex: 2;
  transition: flex 0.25s ease, opacity 0.2s ease;
}

.preview-panel.collapsed {
  flex: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.preview-panel.collapsed .panel-header,
.preview-panel.collapsed .panel-body {
  display: none;
}

/* When preview is collapsed, remove right border from editor */
.workspace.preview-hidden .editor-panel {
  border-right: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--ui-border);
  background: var(--ui-surface);
}

.panel-header h2 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ui-text-muted);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
}

/* Editor Controls */
.editor-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Global Link Button */
.global-link-btn {
  width: 28px;
  height: 28px;
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  background: var(--ui-input-bg);
  cursor: pointer;
  position: relative;
  transition: border-color 0.15s, background 0.15s;
}

.global-link-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 16px;
  /* Chain-link icon via inline SVG */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71'/%3E%3Cpath d='M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71'/%3E%3C/svg%3E");
}

.global-link-btn.linked {
  border-color: var(--ui-accent);
  background: rgba(233, 69, 96, 0.15);
}

.global-link-btn.linked::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23e94560' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71'/%3E%3Cpath d='M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71'/%3E%3C/svg%3E");
}

.global-link-btn:hover {
  border-color: var(--ui-accent-hover);
}

/* Preview Toggle Button */
.preview-toggle-btn {
  width: 28px;
  height: 28px;
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  background: var(--ui-input-bg);
  cursor: pointer;
  position: relative;
  transition: border-color 0.15s, background 0.15s;
}

.preview-toggle-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 16px;
  /* Eye icon - preview visible */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z'/%3E%3Ccircle cx='12' cy='12' r='3'/%3E%3C/svg%3E");
}

.preview-toggle-btn.active {
  border-color: var(--ui-accent);
  background: rgba(233, 69, 96, 0.15);
}

.preview-toggle-btn.active::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23e94560' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z'/%3E%3Ccircle cx='12' cy='12' r='3'/%3E%3C/svg%3E");
}

.preview-toggle-btn:hover {
  border-color: var(--ui-accent-hover);
}

/* Mode Toggle */
.mode-toggle {
  display: flex;
  gap: 2px;
  background: var(--ui-input-bg);
  border-radius: 6px;
  padding: 2px;
}

.mode-btn {
  padding: 4px 12px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--ui-text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.mode-btn.active {
  background: var(--ui-accent);
  color: #fff;
}

.mode-btn:hover:not(.active) {
  color: var(--ui-text);
}

/* Scrollbar */
.panel-body::-webkit-scrollbar {
  width: 6px;
}

.panel-body::-webkit-scrollbar-track {
  background: transparent;
}

.panel-body::-webkit-scrollbar-thumb {
  background: var(--ui-border);
  border-radius: 3px;
}

/* Color Rows */
.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.color-row:last-child {
  border-bottom: none;
}

.color-label {
  flex: 1;
  font-size: 13px;
  color: var(--ui-text);
  min-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.color-picker {
  width: 36px;
  height: 28px;
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  background: var(--ui-input-bg);
  cursor: pointer;
  padding: 2px;
  flex-shrink: 0;
}

.color-picker::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-picker::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

.color-hex {
  width: 76px;
  padding: 4px 8px;
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  background: var(--ui-input-bg);
  color: var(--ui-text);
  font-size: 12px;
  font-family: 'SF Mono', 'Menlo', 'Consolas', monospace;
  flex-shrink: 0;
}

.color-hex:focus {
  outline: none;
  border-color: var(--ui-accent);
}

.color-alpha {
  width: 32px;
  font-size: 11px;
  color: var(--ui-text-muted);
  text-align: center;
  flex-shrink: 0;
}

/* Per-color Link Button */
.link-btn {
  width: 24px;
  height: 24px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: border-color 0.15s, background 0.15s;
}

.link-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 14px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23555' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M18 13h-5'/%3E%3Cpath d='M6 13h5'/%3E%3Cpath d='M15 8l3-1a5 5 0 0 1 0 10l-3-1'/%3E%3Cpath d='M9 8l-3-1a5 5 0 0 0 0 10l3-1'/%3E%3C/svg%3E");
}

.link-btn.linked::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23e94560' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71'/%3E%3Cpath d='M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71'/%3E%3C/svg%3E");
}

.link-btn.linked {
  border-color: rgba(233, 69, 96, 0.3);
}

.link-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ui-border);
}