:root {
  --bg: #0c0a09;
  --bg-elevated: #171310;
  --surface: #1f1a15;
  --surface-hover: #2a221a;
  --border: #33291f;
  --border-strong: #4a3a29;

  --text: #f5efe8;
  --text-muted: #b8ab9a;
  --text-faint: #877a6a;

  --accent: #f97316;
  --accent-strong: #fb923c;
  --accent-contrast: #1a0f04;
  --accent-soft: rgba(249, 115, 22, 0.14);

  --ok: #34d399;
  --ok-soft: rgba(52, 211, 153, 0.12);
  --warn: #facc15;
  --warn-soft: rgba(250, 204, 21, 0.12);
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  padding: 2.5rem 1.5rem 1rem;
  text-align: center;
}

header h1 {
  margin: 0 0 0.4rem;
  font-size: 1.7rem;
}

header h1 span {
  color: var(--accent-strong);
}

header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.badge {
  display: inline-block;
  margin-top: 0.7rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--ok-soft);
  color: var(--ok);
  border: 1px solid rgba(52, 211, 153, 0.3);
  font-size: 0.78rem;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
  display: grid;
  gap: 1.5rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
}

.panel h2 {
  margin-top: 0;
  font-size: 1.1rem;
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

textarea, input[type="text"], input[type="number"], input[type="range"], input[type="color"], select {
  width: 100%;
  padding: 0.55rem 0.7rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
}

textarea {
  min-height: 90px;
  resize: vertical;
}

input[type="color"] {
  padding: 0.25rem;
  height: 42px;
}

textarea:focus, input:focus, select:focus {
  outline: 2px solid var(--accent-strong);
  outline-offset: 1px;
  border-color: var(--accent);
}

.field {
  margin-bottom: 0.9rem;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-row input { width: auto; }

.file-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

button {
  cursor: pointer;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 600;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

.btn-primary:hover { background: var(--accent-strong); }

.btn-secondary {
  background: var(--surface-hover);
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover { border-color: var(--accent); color: var(--accent-strong); background: var(--accent-soft); }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(248, 113, 113, 0.4);
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
}

.btn-danger:hover { background: var(--danger-soft); }

.actions {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.qr-canvas-wrap {
  background: white;
  padding: 16px;
  border-radius: var(--radius-md);
  display: inline-flex;
}

#qr-canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.hint {
  color: var(--text-faint);
  font-size: 0.8rem;
  margin-top: 0.3rem;
}

footer {
  text-align: center;
  color: var(--text-faint);
  font-size: 0.78rem;
  padding: 1rem 1.5rem 2.5rem;
}

.section-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.color-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}