:root {
  --bg: #f2f4f8;
  --panel: #ffffff;
  --border: #dde3ec;
  --text: #1f2733;
  --muted: #7b8494;
  --accent: #2f6fed;
  --accent-light: #e8f0fe;
  --danger: #e5484d;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ---------- 左侧工具栏 ---------- */
.toolbar {
  width: 360px;
  min-width: 320px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 14px;
}

.app-title {
  font-size: 18px;
  margin: 2px 0 10px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  margin-bottom: 12px;
  background: #fbfcfe;
}

.panel h2 {
  font-size: 13px;
  margin: 2px 0 8px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.row.full { flex-direction: column; align-items: stretch; gap: 4px; }
.row label {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.row select, .row input[type="number"] {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}
.row textarea {
  width: 100%;
  font-size: 13px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  resize: vertical;
  font-family: inherit;
}
.row input[type="color"] {
  width: 40px; height: 28px;
  padding: 0; border: 1px solid var(--border);
  border-radius: 6px; background: #fff;
  cursor: pointer;
}
.row input[type="checkbox"] { accent-color: var(--accent); }
.row input[type="range"] { flex: 1; accent-color: var(--accent); }

.hidden-range { width: 80px; flex: none; }
.hidden-file { display: none; }

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  margin: 0 0 10px;
}
legend {
  font-size: 12px;
  color: var(--accent);
  padding: 0 6px;
  font-weight: 600;
}

.btn-row { flex-wrap: wrap; }
.btn-row button {
  font-size: 12px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  transition: .15s;
}
.btn-row button:hover { background: var(--accent-light); border-color: var(--accent); }
.btn-row button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-row button.primary:hover { background: #1e5fe0; }
.btn-row button.danger { color: var(--danger); border-color: #f2c1c3; }
.btn-row button.danger:hover { background: #fdecec; }

.seg {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  flex: 1;
}
.seg button {
  flex: 1;
  font-size: 12px;
  padding: 5px 0;
  border: none;
  background: #fff;
  cursor: pointer;
  color: var(--muted);
}
.seg button + button { border-left: 1px solid var(--border); }
.seg button.active {
  background: var(--accent);
  color: #fff;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.preset-grid button {
  font-size: 18px;
  padding: 8px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
}
.preset-grid button:hover { background: var(--accent-light); }
.preset-grid button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.hint { font-size: 11px; color: var(--muted); }
.muted { color: var(--muted); font-size: 12px; }

.export-panel button { width: auto; }
.export-panel .btn-row button { flex: 1 1 auto; }

/* ---------- 右侧预览区 ---------- */
.preview {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.preview-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
}

.badge {
  background: var(--accent-light);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
}

.canvas-outer {
  flex: 1;
  overflow: auto;
  padding: 24px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.canvas {
  background: #fff;
  box-shadow: 0 4px 24px rgba(0,0,0,.12);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  overflow: hidden;
}

.preview .text-box-item {
  cursor: pointer;
  position: relative;
}
.preview .text-box-item .box-inner {
  width: 100%;
}
.preview .text-box-item.selected .box-inner {
  outline: 2px dashed var(--accent);
  outline-offset: 4px;
}

.text-box-item .box-label {
  position: absolute;
  top: -8px;
  left: -8px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  padding: 1px 7px;
  border-radius: 10px;
  opacity: 0;
  pointer-events: none;
  transition: .15s;
}
.preview .text-box-item.selected .box-label { opacity: 1; }

.empty-tip {
  color: var(--muted);
  text-align: center;
  padding: 40px 0;
  font-size: 14px;
}