:root {
  color-scheme: light;
  --bg: #f8fafc;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #cbd5e1;
  --accent: #0f766e;
  --danger: #991b1b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  color: var(--text);
}

.shell {
  max-width: 860px;
  margin: 2rem auto;
  padding: 1.25rem;
}

h1, h2 {
  margin-top: 0;
}

.muted {
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn,
button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  padding: 0.55rem 0.9rem;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  font: inherit;
}

.btn.secondary,
button.secondary {
  background: transparent;
  color: var(--accent);
}

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

form {
  display: grid;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.25rem;
  font-size: 0.95rem;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
  font: inherit;
  background: #fff;
}

.inline-check {
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.6rem;
}

.inline-check input {
  width: auto;
}

.preview-shell {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem;
  background: #fff;
}

.preview-shell h2 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.duck-preview {
  width: 100%;
  min-height: 220px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #f8fafc;
}

.duck-preview canvas {
  display: block;
  width: 100%;
  height: 100%;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.cards {
  display: grid;
  gap: 0.75rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.85rem;
}

.card h3 {
  margin: 0 0 0.4rem;
}

.statline {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0.4rem 0;
}

small.error {
  color: var(--danger);
}

small.ok {
  color: var(--accent);
}

@media (max-width: 700px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}