:root {
  --bg-base: #0b0f19;
  --bg-surface: #111827;
  --bg-panel: #0f172a;
  --bg-elevated: #1e293b;
  --bg-hover: #334155;
  --border: #1e293b;
  --border-subtle: #334155;
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: rgba(59, 130, 246, 0.16);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.14);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.16);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.16);
  --super-op: #c084fc;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

[data-theme="light"] {
  --bg-base: #ffffff;
  --bg-surface: #f8fafc;
  --bg-panel: #f1f5f9;
  --bg-elevated: #e2e8f0;
  --bg-hover: #cbd5e1;
  --border: #e2e8f0;
  --border-subtle: #cbd5e1;
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --super-op: #7c3aed;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-main);
  font-size: 13.5px;
}

/* App Header */
.ide-header {
  height: 48px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  gap: 0.75rem;
}

.ide-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  text-decoration: none;
  white-space: nowrap;
}

.ide-badge {
  background: linear-gradient(135deg, #2563eb, #8b5cf6);
  color: #fff;
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.ide-nav-selects {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.ide-select {
  background: var(--bg-panel);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 0.35rem;
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
  font-family: var(--font-sans);
  outline: none;
  max-width: 260px;
  cursor: pointer;
}

.ide-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg-panel);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.12s ease;
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #fff !important;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover) !important;
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger);
  color: #fff;
}

.kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.05rem 0.3rem;
  border-radius: 0.2rem;
}

.status-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  text-transform: uppercase;
}
.status-wasm-loading { background: var(--warning-bg); color: var(--warning); border: 1px solid var(--warning); }
.status-wasm-ready   { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }

/* Main Workspace Grid */
.ide-workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: calc(100vh - 48px);
  overflow: hidden;
}

.ide-pane {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 0;
  overflow: hidden;
}

.ide-pane-left {
  border-right: 1px solid var(--border);
}

/* Virtual Tabs Bar */
.ide-tabs-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0 0.5rem;
  height: 36px;
  min-height: 36px;
  overflow-x: auto;
}

.ide-file-tabs {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  height: 100%;
}

.file-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-panel);
  border: 1px solid transparent;
  border-bottom: none;
  padding: 0.35rem 0.65rem;
  border-radius: 0.3rem 0.3rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  height: calc(100% - 3px);
  margin-top: 3px;
}

.file-tab.active {
  background: var(--bg-base);
  color: var(--accent);
  font-weight: 700;
  border-color: var(--border);
  border-bottom-color: var(--bg-base);
}

.file-tab-close {
  opacity: 0.6;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0 0.2rem;
  border-radius: 0.2rem;
}
.file-tab-close:hover { opacity: 1; background: var(--danger-bg); color: var(--danger); }

.tab-add-btn {
  background: none;
  border: 1px dashed var(--border-subtle);
  color: var(--text-muted);
  padding: 0.15rem 0.45rem;
  border-radius: 0.3rem;
  cursor: pointer;
  font-size: 0.75rem;
}
.tab-add-btn:hover { color: var(--text-main); border-color: var(--accent); }

/* Code Editor Container */
.ide-editor-container {
  flex: 1;
  display: flex;
  position: relative;
  background: var(--bg-base);
  overflow: hidden;
  min-height: 150px;
}

.ide-gutter {
  width: 58px;
  padding: 0.75rem 0.5rem 0.75rem 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-muted);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  user-select: none;
  overflow: hidden;
  flex-shrink: 0;
}

.gutter-line {
  position: relative;
  cursor: pointer;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.25rem;
  padding-right: 0.35rem;
}

.gutter-line:hover { color: var(--text-main); }
.gutter-bp {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--danger);
  display: inline-block;
}
.gutter-active {
  background: var(--warning-bg);
  color: var(--warning);
  font-weight: 700;
}
.gutter-err {
  background: var(--danger-bg);
  color: var(--danger);
  font-weight: 700;
}

.ide-editor-wrap {
  position: relative;
  flex: 1;
  overflow: hidden;
}

.ide-editor-backdrop,
.ide-editor-textarea {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.55;
  tab-size: 4;
  white-space: pre;
  overflow: auto;
  border: none;
  outline: none;
}

.ide-editor-backdrop {
  pointer-events: none;
  color: var(--text-main);
  z-index: 1;
}

.ide-editor-textarea {
  z-index: 2;
  color: transparent;
  background: transparent;
  caret-color: var(--text-main);
  resize: none;
}

.ide-editor-textarea::selection {
  background: rgba(59, 130, 246, 0.28);
  color: transparent;
}

/* Syntax Highlighting */
.tok-kw { color: #ff7b72; font-weight: 600; }
.tok-type { color: #d2a8ff; font-weight: 600; }
.tok-builtin { color: #79c0ff; font-weight: 600; }
.tok-str { color: #a5d6ff; }
.tok-char { color: #7ee787; }
.tok-num { color: #79c0ff; }
.tok-comment { color: #8b949e; font-style: italic; }
.tok-op { color: #ff7b72; }
.tok-fn { color: #d2a8ff; font-weight: 600; }

[data-theme="light"] .tok-kw { color: #d73a49; }
[data-theme="light"] .tok-type { color: #6f42c1; }
[data-theme="light"] .tok-builtin { color: #005cc5; }
[data-theme="light"] .tok-str { color: #032f62; }
[data-theme="light"] .tok-char { color: #22863a; }
[data-theme="light"] .tok-num { color: #005cc5; }
[data-theme="light"] .tok-comment { color: #6a737d; }
[data-theme="light"] .tok-op { color: #d73a49; }
[data-theme="light"] .tok-fn { color: #6f42c1; }

/* Statusbar */
.ide-statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.25rem 0.85rem;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Right Pane: Multi-Tab Output & Debugger */
.ide-nav-tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0 0.85rem;
  height: 36px;
  min-height: 36px;
}

.ide-tabs-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  height: 100%;
}

.ide-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0 0.65rem;
  height: 100%;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.12s ease;
}

.ide-tab:hover { color: var(--text-main); }
.ide-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.05rem 0.35rem;
  border-radius: 999px;
}

.ide-content-tab {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow-y: auto;
  padding: 0.85rem;
  gap: 0.85rem;
}
.ide-content-tab.active { display: flex; }

/* Output Tab */
.console-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 180px;
}

.stdout-pre {
  flex: 1;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.result-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--success);
  border-radius: 0.45rem;
  padding: 0.65rem 0.9rem;
}
.result-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  display: flex;
  justify-content: space-between;
}
.result-pre {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-main);
  white-space: pre-wrap;
  word-break: break-all;
}

.error-card {
  background: var(--danger-bg);
  border: 1px solid var(--danger);
  border-left-width: 4px;
  border-radius: 0.45rem;
  padding: 0.75rem 0.9rem;
}
.error-pre {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-main);
  white-space: pre-wrap;
}

/* Debugger Controls & Panels */
.debug-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  padding: 0.45rem 0.75rem;
  flex-wrap: wrap;
}

.debug-controls {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.debug-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  flex: 1;
}

.debug-panel {
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  overflow: hidden;
  min-height: 180px;
}

.debug-panel-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.75rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: 0.76rem;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.debug-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
  font-family: var(--font-mono);
  font-size: 12px;
}

.frame-item {
  padding: 0.35rem 0.55rem;
  border-radius: 0.25rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  color: var(--text-secondary);
}
.frame-item:hover { background: var(--bg-elevated); color: var(--text-main); }
.frame-item.active { background: var(--accent-light); color: var(--accent); font-weight: 700; }

.var-item {
  display: flex;
  flex-direction: column;
  padding: 0.35rem 0.55rem;
  border-radius: 0.25rem;
  border-bottom: 1px solid var(--border);
}
.var-main { display: flex; align-items: baseline; gap: 0.4rem; }
.var-name { font-weight: 700; color: var(--accent); }
.var-type { font-size: 0.7rem; color: var(--text-muted); }
.var-val  { word-break: break-all; }

/* Visualizer Previews (Grid & RangeSet) */
.grid-preview {
  margin-top: 0.4rem;
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  padding: 0.4rem;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.25;
  white-space: pre;
  overflow-x: auto;
  color: #38bdf8;
}

.rangeset-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.35rem;
}

.range-badge {
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.1rem 0.4rem;
  border-radius: 0.2rem;
  font-size: 11px;
}

/* Bytecode Disassembly */
.bytecode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  flex: 1;
}

.bytecode-col {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg-panel);
  overflow: hidden;
}

.bytecode-pre {
  flex: 1;
  padding: 0.75rem;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  overflow: auto;
  white-space: pre;
}

.bc-hdr { color: var(--accent); font-weight: 700; }
.bc-off { color: var(--text-muted); }
.bc-op  { color: var(--text-main); font-weight: 600; }
.bc-super { color: var(--super-op); font-weight: 700; }

@media (max-width: 960px) {
  html, body { overflow: auto; }
  .ide-workspace { grid-template-columns: 1fr; height: auto; }
  .ide-pane-left { height: 600px; border-right: none; border-bottom: 1px solid var(--border); }
  .ide-pane-right { min-height: 500px; }
  .bytecode-grid, .debug-grid { grid-template-columns: 1fr; }
}