:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --border: #e3e8f0;
  --text: #1f2a3d;
  --muted: #7b879c;
  --primary: #2f6bff;
  --primary-d: #1f52d6;
  --danger: #e03b3b;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(31, 42, 61, .06);
}

* { box-sizing: border-box; }

/* hidden 属性需盖过 .field 的 display:flex，否则一维/二维选项组切换失效 */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 顶部栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand .logo {
  font-size: 26px;
  letter-spacing: -2px;
  color: var(--primary);
  font-weight: 700;
}
.brand h1 { margin: 0; font-size: 19px; }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: 12px; }
.topbar-actions { display: flex; gap: 8px; }

/* 布局 */
.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  padding: 20px 24px;
  align-items: start;
}

/* 控制面板 */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  position: sticky;
  top: 84px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field > label { font-weight: 600; font-size: 13px; }
.hint { color: var(--muted); font-size: 12px; }

textarea, select, input[type="text"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
  font: inherit;
  color: var(--text);
  background: #fbfcfe;
  resize: vertical;
}
textarea:focus, select:focus, input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, .12);
}

fieldset.group {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px 14px;
  margin: 0;
}
fieldset.group legend {
  padding: 0 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}

.row { display: flex; gap: 12px; }
.row .col { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.row .col label { font-size: 12px; color: var(--muted); }
.v { color: var(--primary); font-weight: 700; }

input[type="range"] { width: 100%; accent-color: var(--primary); }
input[type="color"] {
  width: 100%;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}

.switch { display: flex; align-items: center; gap: 8px; font-size: 13px; cursor: pointer; }
.switch input { width: 16px; height: 16px; accent-color: var(--primary); }

/* 按钮 */
.btn {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 9px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, box-shadow .15s, border-color .15s;
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-d); }
.btn-ghost { background: #fff; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

/* 预览区 */
.preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  align-content: start;
  min-height: 200px;
}
.empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--muted);
  padding: 60px 20px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}
.empty-ic { font-size: 42px; color: #c7d0e0; letter-spacing: -3px; margin-bottom: 10px; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card-canvas {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  background: #fff;
  border-radius: 8px;
  overflow: auto;
  padding: 6px;
}
.card-canvas canvas { max-width: 100%; height: auto; }
.card-error {
  color: var(--danger);
  background: #fdeded;
  border: 1px solid #f7c9c9;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12px;
}
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.card-label {
  font-size: 12px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}
.card-actions { display: flex; gap: 4px; }
.mini {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  cursor: pointer;
  color: var(--muted);
}
.mini:hover { border-color: var(--primary); color: var(--primary); }

/* 提示 toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2a3d;
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: 0 6px 24px rgba(0,0,0,.2);
  z-index: 50;
  opacity: 0;
  transition: opacity .2s, transform .2s;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* 响应式 */
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .panel { position: static; }
}

/* 打印：仅打印条码卡片 */
@media print {
  .topbar, .panel, .empty, .card-actions, .card-error { display: none !important; }
  body { background: #fff; }
  .layout { display: block; padding: 0; }
  .preview { display: block; }
  .card {
    box-shadow: none;
    border: none;
    page-break-inside: avoid;
    display: inline-block;
    width: auto;
    margin: 10px;
    vertical-align: top;
  }
  /* 生成失败的卡片不打印（避免打印出空白框） */
  .card.card--error { display: none !important; }
}