:root {
  --bg: #090b0e;
  --surface: #101319;
  --surface-elevated: #161b24;
  --border: #1e2430;
  --border-focus: #2d3648;
  --text: #e6edf3;
  --text-muted: #798394;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --danger: #ef4444;
  --val-color: #38bdf8;
  --val-num: #facc15;
  --font-display: "Chakra Petch", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  padding: 24px 20px;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
}

.app {
  width: 100%;
  max-width: 980px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

h1 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
}

/* Input Bar */
.input-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-bar {
  display: flex;
  gap: 8px;
}

input[type="text"] {
  flex: 1;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.12s ease;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

.error-text {
  color: var(--danger);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  min-height: 1rem;
}

/* Common Buttons */
button {
  padding: 7px 12px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.82rem;
  font-family: var(--font-sans);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

button:hover {
  background: var(--surface-elevated);
  border-color: var(--border-focus);
}

button.primary {
  background: var(--accent);
  color: #08090c;
  border-color: var(--accent);
  font-weight: 600;
}

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

/* Workspace Layout */
.workspace {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 16px;
}

@media (max-width: 768px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

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

.pane-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 32px;
}

.pane-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.pane-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Dropdown Menu */
.dropdown-wrap {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--surface-elevated);
  border: 1px solid var(--border-focus);
  border-radius: 4px;
  padding: 4px;
  display: none;
  flex-direction: column;
  min-width: 270px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 50;
}

.dropdown-menu.open {
  display: flex;
}

.dropdown-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 8px 10px;
  background: transparent;
  border: none;
  border-radius: 3px;
  color: var(--text);
  text-align: left;
  width: 100%;
  cursor: pointer;
  font-family: var(--font-sans);
}

.dropdown-item:hover {
  background: rgba(245, 158, 11, 0.12);
  color: #fff;
}

.dropdown-item-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}

.dropdown-item:hover .dropdown-item-title {
  color: var(--accent);
}

.dropdown-item-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 2px;
}

/* Syntax Highlighting Code View */
.code-view {
  width: 100%;
  height: 480px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-y: auto;
  user-select: text;
  white-space: pre;
}

.code-line {
  display: flex;
  gap: 8px;
}

.cmd-name {
  color: #94a3b8;
}

.cmd-val {
  color: var(--val-color);
  font-weight: 500;
}

.cmd-val.num {
  color: var(--val-num);
}

/* Preview Canvas */
.canvas-box {
  width: 100%;
  height: 340px;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

canvas {
  display: block;
  image-rendering: pixelated;
}

/* Preview Controls Footer */
.pane-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.bg-row {
  display: flex;
  gap: 4px;
}

.bg-btn {
  width: 20px;
  height: 20px;
  padding: 0;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.bg-btn.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.zoom-row {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.z-btn {
  padding: 2px 7px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
}

.z-btn.active {
  border-color: var(--accent);
  color: var(--accent);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--surface-elevated);
  border: 1px solid var(--border-focus);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 8px 14px;
  border-radius: 4px;
  opacity: 0;
  transition: all 0.12s ease;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* App Footer */
footer {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

footer a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.12s ease;
}

footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}

footer .heart {
  color: var(--accent);
  margin-left: 2px;
}