:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #1a1d23;
  --text-muted: #5b6270;
  --border: #e1e4e9;
  --accent: #4f46e5;
  --accent-2: #0891b2;
  --accent-contrast: #ffffff;
  --input-bg: #ffffff;
  --radius: 10px;
}

[data-theme="dark"] {
  --bg: #121318;
  --panel: #1b1d24;
  --text: #e9eaee;
  --text-muted: #9ba0ab;
  --border: #2b2e37;
  --input-bg: #22242c;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
}

h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted); margin: 0 0 12px; }
h3 { font-size: 13px; color: var(--text-muted); margin: 16px 0 6px; font-weight: 600; }

a { color: var(--accent); }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { border-radius: 6px; display: block; }
.brand-name { font-weight: 600; font-size: 16px; }
.brand-name strong { color: var(--accent); }

.topbar-actions { display: flex; gap: 8px; }

.icon-btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

.layout {
  display: grid;
  grid-template-columns: 320px 1fr 340px;
  gap: 16px;
  padding: 20px;
  align-items: start;
}

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

label.checkbox { display: flex; align-items: center; gap: 6px; font-size: 13px; }
label.checkbox input { margin: 0; }

input[type="text"],
input[type="tel"],
input[type="email"],
input[type="datetime-local"],
textarea,
select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
}

textarea { resize: vertical; }

input[type="color"] {
  width: 100%;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--input-bg);
  margin-top: 4px;
}

input[type="range"] { width: 100%; margin-top: 6px; }
input[type="file"] { width: 100%; font-size: 13px; margin-bottom: 8px; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tab {
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: 7px;
  font-size: 12.5px;
  cursor: pointer;
}

.tab.active {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--input-bg));
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.btn-primary, .btn-secondary {
  border: none;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 500;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, black); }

.btn-secondary {
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-secondary.small { padding: 6px 10px; font-size: 12.5px; margin-bottom: 8px; margin-right: 6px; }

.field-group { margin-bottom: 18px; }
.field-group:last-child { margin-bottom: 0; }

.preset-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }

.panel-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.preview-canvas-wrap {
  width: 100%;
  min-height: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  padding: 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  position: relative;
  overflow: visible;
}

.preview-canvas-wrap[data-frame="scan-me"] { padding: 40px; }

#qr-render { position: relative; z-index: 1; display: flex; align-items: center; justify-content: center; }
#qr-render canvas, #qr-render svg, #qr-render img { display: block; max-width: 100%; }

.frame-label {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
}

.preview-canvas-wrap[data-bg="stars"] .frame-label { color: #ffffff; }

.preview-canvas-wrap[data-frame="scan-me"] #qr-render {
  outline: 2px dashed #1a1d23;
  outline-offset: 12px;
  border-radius: 6px;
}
.preview-canvas-wrap[data-bg="stars"][data-frame="scan-me"] #qr-render { outline-color: #ffffff; }

/* --- Background theme: paper / hand-drawn --- */
.preview-canvas-wrap[data-bg="paper"] {
  background-color: #f1ead9;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(0,0,0,0.035) 0, transparent 2px),
    radial-gradient(circle at 70% 60%, rgba(0,0,0,0.03) 0, transparent 2px),
    radial-gradient(circle at 40% 80%, rgba(0,0,0,0.03) 0, transparent 2px),
    repeating-linear-gradient(0deg, rgba(120,100,70,0.04) 0, rgba(120,100,70,0.04) 1px, transparent 1px, transparent 26px);
  border: 2px dashed #b8a97e;
  border-radius: 14px;
  box-shadow: inset 0 0 0 6px #f1ead9, inset 0 0 0 8px #b8a97e22;
}
.preview-canvas-wrap[data-bg="paper"] #qr-render {
  transform: rotate(-0.6deg);
}

/* --- Background theme: starry night --- */
.preview-canvas-wrap[data-bg="stars"] {
  background: radial-gradient(ellipse at top, #1b2140 0%, #0a0c1a 70%);
  border: 1px solid #2a2f55;
  background-image:
    radial-gradient(1.5px 1.5px at 10% 20%, #fff 100%, transparent),
    radial-gradient(1px 1px at 80% 10%, #fff 100%, transparent),
    radial-gradient(1.5px 1.5px at 60% 80%, #fff 100%, transparent),
    radial-gradient(1px 1px at 30% 70%, #fff 100%, transparent),
    radial-gradient(1.5px 1.5px at 90% 50%, #fff 100%, transparent),
    radial-gradient(1px 1px at 45% 35%, #fff 100%, transparent),
    radial-gradient(1px 1px at 20% 90%, #fff 100%, transparent),
    radial-gradient(ellipse at top, #1b2140 0%, #0a0c1a 70%);
}
.preview-canvas-wrap[data-bg="stars"] #qr-render {
  background: #fff;
  padding: 14px;
  border-radius: 10px;
}

.export-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.export-row label { margin-bottom: 0; }

.hint { font-size: 12px; color: var(--text-muted); text-align: center; max-width: 480px; word-break: break-all; }

.hidden { display: none !important; }

.footer {
  padding: 16px 20px 32px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12.5px;
}
.footer a { color: var(--text-muted); text-decoration: underline; }