:root {
  /* Light theme (default) */
  --bg:#f8fafc;          /* page background */
  --panel:#ffffff;       /* control panel */
  --panel-2:#f1f5f9;     /* panel gradient end */
  --ink:#1e293b;         /* UI text */
  --ink-muted:#64748b;   /* muted text */
  --accent:#0ea5e9;      /* accent color */
  --border:#e2e8f0;      /* borders */
  --input-bg:#ffffff;    /* input background */
  --kbd-bg:#f1f5f9;      /* keyboard shortcut background */
  --btn-secondary-bg:#334155;
  --btn-secondary-text:#f1f5f9;
  --shadow:rgba(0,0,0,.1);
}

/* Dark theme for users who prefer it */
@media (prefers-color-scheme: dark) {
  :root{
    --bg:#0f172a;          /* page background */
    --panel:#111827;       /* control panel */
    --panel-2:#0b1220;     /* panel gradient end */
    --ink:#e5e7eb;         /* UI text */
    --ink-muted:#9ca3af;   /* muted text */
    --accent:#22d3ee;      /* accent color */
    --border:#1f2937;      /* borders */
    --input-bg:#0b1020;    /* input background */
    --kbd-bg:#121826;      /* keyboard shortcut background */
    --btn-secondary-bg:#223851;
    --btn-secondary-text:#cde7ff;
    --shadow:rgba(0,0,0,.35);
  }
}

* {
  box-sizing:border-box;
}

html,body {
  height:100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.35 system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji";
  display: flex;
  gap: 16px;
  padding: 16px;
}

.panel {
  width: 360px;
  max-width: 100%;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 10px 30px var(--shadow);
  overflow: auto;
}

.panel h2 {
  margin: 6px 0 12px;
  font-size: 18px;
}

.section {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 12px;
}

label {
  display: block;
  margin: 8px 0 4px;
  font-weight: 600;
}

input[type="text"],
input[type="number"],
input[type="url"],
select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--ink);
}

input[type="color"] {
  width: 48px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--input-bg);
}

input[type="file"] {
  width: 100%;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.row > * {
  flex: 1;
}

.btn {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  background: var(--accent);
  color: #ffffff;
  border: 0;
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
}

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

.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kbd {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--kbd-bg);
  border: 1px solid var(--border);
  color: var(--ink-muted);
}

.stage {
  flex: 1;
  display: grid;
  place-items: center;
}

canvas {
  background: #d1d5db;
  border-radius: 18px;
  box-shadow: 0 20px 50px var(--shadow);
}

.small {
  font-size: 12px;
  color: var(--ink-muted);
}

.hint {
  margin: 6px 0 0;
  color: var(--ink-muted);
}

/* Mobile responsive layout */
@media (max-width: 768px) {
  body {
    flex-direction: column;
    gap: 12px;
    padding: 12px;
  }

  .panel {
    width: 100%;
    order: 2; /* Panel goes below canvas on mobile */
  }

  .stage {
    order: 1; /* Canvas goes above panel on mobile */
    min-height: 50vh; /* Ensure canvas gets reasonable space */
  }
}