:root {
  --bg-dark: #090d16;
  --bg-panel: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #151d30;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-cyan: #38bdf8;
  --accent-cyan-hover: #0ea5e9;
  --accent-purple: #a855f7;
  --accent-green: #22c55e;
  --accent-orange: #f97316;
  --accent-red: #ef4444;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "Fira Code", Menlo, Monaco, Consolas, "Courier New", monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.2rem;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo {
  font-size: 1.5rem;
}

.brand-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.badge {
  font-size: 0.75rem;
  background-color: var(--bg-card);
  color: var(--text-muted);
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.controls label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.select-input {
  background-color: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.select-input:focus {
  border-color: var(--accent-cyan);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease-in-out;
}

.btn-primary {
  background-color: var(--accent-cyan);
  color: #020617;
}

.btn-primary:hover {
  background-color: var(--accent-cyan-hover);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: #27354f;
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  color: var(--text-main);
  background-color: var(--bg-card);
}

.status-badge {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  background-color: #064e3b;
  color: #6ee7b7;
  font-weight: 500;
}

/* Main Workspace */
.workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.pane {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.editor-pane {
  border-right: 1px solid var(--border-color);
}

.pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
}

.pane-title {
  font-weight: 600;
  color: var(--text-muted);
}

.shortcut-tip {
  font-size: 0.75rem;
  color: var(--text-muted);
}

kbd {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}

/* Editor */
.editor-wrapper {
  display: flex;
  flex: 1;
  background-color: var(--bg-dark);
  overflow: hidden;
}

.line-numbers {
  width: 3rem;
  padding: 1rem 0.5rem;
  background-color: #0b1120;
  color: #475569;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  user-select: none;
  overflow-y: hidden;
  border-right: 1px solid #1e293b;
}

.code-editor {
  flex: 1;
  padding: 1rem;
  background-color: var(--bg-dark);
  color: var(--text-main);
  border: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  white-space: pre;
  tab-size: 4;
}

/* Output Pane */
.tabs {
  display: flex;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  padding: 0.6rem 1.2rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease-in-out;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
  background-color: var(--bg-dark);
}

.tab-content {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow: auto;
  background-color: var(--bg-dark);
}

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

/* Console */
.console-toolbar {
  padding: 0.4rem 1rem;
  background-color: #0b1120;
  border-bottom: 1px solid #1e293b;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.terminal-view {
  flex: 1;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-y: auto;
  color: #cbd5e1;
}

.terminal-line {
  display: block;
  margin-bottom: 0.2rem;
}

.terminal-line.stdout {
  color: #e2e8f0;
}

.terminal-line.stderr {
  color: var(--accent-red);
}

.terminal-line.system {
  color: var(--accent-cyan);
}

.terminal-line.success {
  color: var(--accent-green);
}

/* Visual Blocks Studio */
.blocks-tab-layout {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.blocks-editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background-color: #0b1120;
  border-bottom: 1px solid var(--border-color);
  gap: 0.5rem;
  flex-wrap: wrap;
}

.blocks-toolbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toolbar-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.sync-status-pill {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  background-color: rgba(34, 197, 94, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.sync-status-pill.dirty {
  background-color: rgba(249, 115, 22, 0.15);
  color: var(--accent-orange);
  border-color: rgba(249, 115, 22, 0.3);
}

.blocks-toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-sm {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
}

.blocks-workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100% - 40px);
}

/* Palette / Toolbox */
.blocks-palette {
  width: 220px;
  min-width: 200px;
  background-color: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  padding: 0.75rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.palette-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border-color);
}

.palette-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.palette-group-title {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.2rem;
}

.palette-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease-in-out;
}

.palette-item:hover {
  transform: translateX(3px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

.palette-item.item-say:hover { border-color: var(--accent-green); background-color: #064e3b; }
.palette-item.item-let:hover, .palette-item.item-set:hover { border-color: #3b82f6; background-color: #172554; }
.palette-item.item-if:hover, .palette-item.item-while:hover, .palette-item.item-for:hover, .palette-item.item-repeat:hover { border-color: var(--accent-orange); background-color: #431407; }
.palette-item.item-function:hover, .palette-item.item-return:hover { border-color: var(--accent-purple); background-color: #3b0764; }
.palette-item.item-struct:hover, .palette-item.item-enum:hover, .palette-item.item-match:hover, .palette-item.item-when:hover { border-color: #6366f1; background-color: #1e1b4b; }
.palette-item.item-try:hover, .palette-item.item-catch:hover, .palette-item.item-finally:hover, .palette-item.item-spawn:hover, .palette-item.item-yield:hover { border-color: var(--accent-cyan); background-color: #0c4a6e; }

.palette-icon {
  font-size: 0.85rem;
}

/* Canvas Area */
.blocks-canvas-area {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.5rem;
  background-color: var(--bg-dark);
}

.blocks-canvas {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-width: 900px;
}

.blocks-placeholder, .blocks-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
  text-align: center;
  gap: 0.5rem;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.empty-hint {
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

/* Editable Block Card */
.editable-block {
  border-radius: 8px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 5px rgba(0,0,0,0.3);
  display: flex;
  flex-direction: column;
  border-left: 5px solid #64748b;
  transition: border-color 0.15s, transform 0.1s;
}

.editable-block:hover {
  border-color: #475569;
}

.nested-block {
  position: relative;
}

.nested-block::before {
  content: '';
  position: absolute;
  left: -0.9rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: #334155;
}

/* Category Borders */
.block-kind-say { border-left-color: var(--accent-green); }
.block-kind-let, .block-kind-set { border-left-color: #3b82f6; }
.block-kind-function, .block-kind-return { border-left-color: var(--accent-purple); }
.block-kind-if, .block-kind-while, .block-kind-for, .block-kind-repeat { border-left-color: var(--accent-orange); }
.block-kind-struct, .block-kind-enum, .block-kind-match, .block-kind-when { border-left-color: #6366f1; }
.block-kind-try, .block-kind-catch, .block-kind-finally, .block-kind-spawn, .block-kind-yield { border-left-color: var(--accent-cyan); }

.block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.65rem;
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.75rem;
}

.block-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  color: #ffffff;
  background-color: #475569;
}

.badge-say { background-color: #059669; }
.badge-let, .badge-set { background-color: #2563eb; }
.badge-function, .badge-return { background-color: #7c3aed; }
.badge-if, .badge-while, .badge-for, .badge-repeat { background-color: #ea580c; }
.badge-struct, .badge-enum, .badge-match, .badge-when { background-color: #4f46e5; }
.badge-try, .badge-catch, .badge-finally, .badge-spawn, .badge-yield { background-color: #0284c7; }

.block-title-label {
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 0.5rem;
  flex: 1;
}

.block-controls {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.block-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s;
}

.block-btn:hover:not(:disabled) {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  border-color: var(--border-color);
}

.block-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.block-btn-delete:hover:not(:disabled) {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
  border-color: rgba(239, 68, 68, 0.4);
}

.block-body {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.block-syntax-label {
  color: var(--text-muted);
  font-weight: 600;
}

.block-field-input {
  background-color: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  outline: none;
  min-width: 80px;
  transition: border-color 0.15s;
}

.block-field-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 1px var(--accent-cyan);
}

/* Tree View */
.tree-view {
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.4;
  color: #93c5fd;
  white-space: pre-wrap;
}

/* Cheatsheet */
.cheatsheet-view {
  padding: 1.5rem;
}

.cheatsheet-view h3 {
  color: var(--accent-cyan);
  margin-bottom: 1rem;
}

.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.cheatsheet-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
}

.cheatsheet-card h4 {
  color: var(--accent-cyan);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.cheatsheet-card code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #e2e8f0;
  display: block;
  background-color: #0b1120;
  padding: 0.6rem;
  border-radius: 4px;
}

@media (max-width: 800px) {
  .workspace {
    flex-direction: column;
  }
  .editor-pane {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    height: 50vh;
  }
}