:root {
  /* Dark theme (default) */
  --color-bg: #1a1a2e;
  --color-bg-panel: #16213e;
  --color-bg-input: #0f0f23;
  --color-bg-secondary: #2a3a5c;
  --color-bg-secondary-hover: #3a4a6c;
  --color-bg-svg: #ffffff;

  --color-text: #eeeeee;
  --color-text-secondary: #888888;
  --color-text-input: #cccccc;
  --color-text-muted: #aaaaaa;
  --color-text-placeholder: #555555;
  --color-text-hint: #666666;

  --color-accent: #4cc9f0;
  --color-accent-hover: #3db8df;
  --color-accent-text: #1a1a2e;

  --color-button: #4361ee;
  --color-button-hover: #3a56d4;
  --color-button-text: #ffffff;

  --color-border: #2a3a5c;
  --color-border-focus: #4cc9f0;

  --color-error-bg: #3d1a1a;
  --color-error-border: #c9444d;
  --color-error-text: #ff6b6b;

  --shadow-panel: 0 4px 20px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f0f2f5;
    --color-bg-panel: #ffffff;
    --color-bg-input: #f8f9fa;
    --color-bg-secondary: #e9ecef;
    --color-bg-secondary-hover: #dee2e6;
    --color-bg-svg: #ffffff;

    --color-text: #212529;
    --color-text-secondary: #6c757d;
    --color-text-input: #495057;
    --color-text-muted: #6c757d;
    --color-text-placeholder: #adb5bd;
    --color-text-hint: #868e96;

    --color-accent: #0891b2;
    --color-accent-hover: #0e7490;
    --color-accent-text: #ffffff;

    --color-button: #4361ee;
    --color-button-hover: #3a56d4;
    --color-button-text: #ffffff;

    --color-border: #dee2e6;
    --color-border-focus: #0891b2;

    --color-error-bg: #fee2e2;
    --color-error-border: #f87171;
    --color-error-text: #dc2626;

    --shadow-panel: 0 4px 20px rgba(0, 0, 0, 0.08);
  }
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: 8px;
}

header p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--color-bg-panel);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow-panel);
  min-width: 0;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
}

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  background: var(--color-button);
  color: var(--color-button-text);
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition:
    background 0.2s,
    transform 0.1s;
}

button:hover {
  background: var(--color-button-hover);
}

button:active {
  transform: scale(0.98);
}

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

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

button.secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

button.secondary:hover {
  background: var(--color-bg-secondary-hover);
}

select {
  background: var(--color-bg-secondary);
  color: var(--color-text);
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

select:focus {
  outline: 2px solid var(--color-accent);
}

#dsl-input {
  width: 100%;
  height: 400px;
  background: var(--color-bg-input);
  color: var(--color-text-input);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 15px;
  font-family: "Fira Code", "Monaco", "Consolas", monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
}

#dsl-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
}

#dsl-input::placeholder {
  color: var(--color-text-placeholder);
}

#svg-output {
  background: var(--color-bg-svg);
  min-height: 300px;
  overflow: auto;
}

#svg-output:empty::before {
  content: "SVG output will appear here";
  color: var(--color-text-muted);
  font-style: italic;
}

#svg-output svg {
  display: block;
  flex-shrink: 0;
}

#error-output {
  display: none;
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: 8px;
  padding: 15px;
  margin-top: 15px;
  color: var(--color-error-text);
  font-family: monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

#debug-output {
  margin-top: 15px;
  font-size: 0.85rem;
}

#debug-output details {
  background: var(--color-bg-input);
  border-radius: 6px;
  margin-bottom: 8px;
}

#debug-output summary {
  padding: 10px 15px;
  cursor: pointer;
  color: var(--color-accent);
  font-weight: 500;
}

#debug-output summary:hover {
  background: var(--color-bg);
}

#debug-output pre {
  padding: 15px;
  margin: 0;
  font-family: "Fira Code", monospace;
  font-size: 0.8rem;
  line-height: 1.4;
  overflow-x: auto;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

.keyboard-hint {
  font-size: 0.75rem;
  color: var(--color-text-hint);
  margin-top: 10px;
}

.keyboard-hint kbd {
  background: var(--color-bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: inherit;
}

footer {
  text-align: center;
  margin-top: 40px;
  padding: 20px;
  color: var(--color-text-placeholder);
  font-size: 0.85rem;
}

footer a {
  color: var(--color-accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}