:root { --bg:#0b0f14; --card:#121826; --text:#e5e9f0; --muted:#a8b2c5; --accent:#f59e0b; }
* { box-sizing: border-box; }
body { margin:0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; background: var(--bg); color: var(--text); }
.container { max-width: 960px; margin: 32px auto; padding: 0 16px; }
h1 { margin: 0 0 8px; font-size: 28px; }
.note { color: var(--muted); margin: 0 0 16px; }
.tabs { display: flex; gap: 8px; margin: 16px 0; flex-wrap: wrap; }
.tab { display: inline-block; padding: 10px 12px; border-radius: 8px; background: var(--card); color: var(--text); text-decoration: none; border: 1px solid #223; }
.tab.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(245,158,11,0.2) inset; }
.panel { background: var(--card); border: 1px solid #223; border-radius: 12px; padding: 16px; margin: 20px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 0 0 6px; }
input, select { width: 100%; padding: 10px 12px; border-radius: 8px; border: 1px solid #334; background: #0d1320; color: var(--text); }
.toolbar { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
button { padding: 10px 14px; border-radius: 8px; border: 1px solid #334; background: #0e1624; color: var(--text); cursor: pointer; }
button:hover { border-color: var(--accent); }
.result { margin-top: 16px; }
.output { background: #0a0f18; border: 1px solid #223; border-radius: 8px; padding: 12px; min-height: 140px; overflow:auto; }
.embed-info { background: #0a1320; border: 1px dashed #223; border-radius: 12px; padding: 16px; margin: 24px 0; }
.canvas-wrap { margin-top: 12px; display: grid; place-items: center; }
canvas { background: #0a0f18; border: 1px solid #223; border-radius: 8px; width: 100%; height: auto; max-width: 640px; }

@media (prefers-color-scheme: light) {
  :root { --bg:#f7f7fb; --card:#ffffff; --text:#0c1116; --muted:#708090; --accent:#f59e0b; }
  input, select { background: #f9fafb; color: var(--text); border-color: #e5e7eb; }
  button { background: #f3f4f6; color: var(--text); border-color: #e5e7eb; }
  .output { background:#f9fafb; border-color:#e5e7eb; }
  .panel { border-color:#e5e7eb; }
}