* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; background: #f0f2f5; color: #222; }
header { padding: 24px 32px 8px; }
header h1 { font-size: 24px; }
header .tag { font-size: 13px; color: #1677ff; border: 1px solid #1677ff; border-radius: 999px; padding: 2px 10px; margin-left: 8px; vertical-align: 3px; }
header .sub { color: #777; font-size: 13px; margin-top: 6px; }
main { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding: 20px 32px 48px; align-items: start; }
@media (max-width: 960px) { main { grid-template-columns: 1fr; } }
.panel { background: #fff; border-radius: 10px; padding: 20px; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
.panel h2 { font-size: 15px; margin: 18px 0 10px; color: #555; }
.panel h2:first-child { margin-top: 0; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
label { font-size: 13px; color: #555; display: block; }
label input, label select { width: 100%; margin-top: 4px; padding: 8px 10px; border: 1px solid #d9d9d9; border-radius: 6px; font-size: 14px; }
label input:focus, label select:focus { outline: none; border-color: #1677ff; }
table { width: 100%; border-collapse: collapse; }
#items th { font-size: 12px; color: #888; text-align: left; padding: 6px 4px; border-bottom: 1px solid #eee; }
#items td { padding: 4px 2px; }
#items input { width: 100%; padding: 7px 8px; border: 1px solid #d9d9d9; border-radius: 6px; font-size: 14px; }
#items .num { width: 90px; }
#items .amt { color: #888; background: #fafafa; }
#items .num input { text-align: right; }
button { cursor: pointer; border: none; border-radius: 6px; padding: 9px 16px; font-size: 14px; background: #1677ff; color: #fff; }
button.ghost { background: #fff; color: #444; border: 1px solid #d9d9d9; }
button.danger { background: #fff; color: #cf1322; border: 1px solid #ffa39e; }
button.del { background: none; color: #bbb; font-size: 16px; padding: 4px 8px; }
button.del:hover { color: #cf1322; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.totals-inputs { margin-top: 14px; }

/* ---------- 主题选择 ---------- */
.theme-row { display: flex; gap: 12px; margin: 8px 0; }
.theme-card { cursor: pointer; border: 2px solid #ddd; border-radius: 10px; padding: 10px 14px; text-align: center; transition: all .15s; }
.theme-card:hover { border-color: #aaa; }
.theme-card.active { border-color: #1677ff; box-shadow: 0 0 0 2px rgba(22,119,255,.2); }
.theme-swatch { width: 28px; height: 28px; border-radius: 50%; margin: 0 auto 4px; }
.swatch-blue { background: #1677ff; }
.swatch-green { background: #20a753; }
.swatch-gold { background: linear-gradient(135deg, #c8a44e, #f0d78c); }
.theme-card .premium-tag { color: #c8a44e; font-size: 11px; font-weight: 600; }

/* ---------- 预览单据 ---------- */
#paper { border: 1px solid #eee; padding: 32px 36px; background: #fff; font-size: 14px; border-radius: 4px; transition: border-color .3s; }
.doc-head { display: flex; justify-content: space-between; align-items: flex-start; padding-bottom: 12px; border-bottom: 2px solid; }
.doc-title { font-size: 26px; font-weight: 700; letter-spacing: 4px; }
.doc-meta { text-align: right; font-size: 13px; color: #555; }
.doc-meta span { margin-right: 6px; }
.doc-parties { display: flex; gap: 24px; margin: 16px 0; }
.doc-parties > div { flex: 1; padding: 10px 12px; border-radius: 6px; font-size: 14px; }
.doc-parties span { display: block; font-size: 12px; margin-bottom: 4px; }
.doc-parties i { display: block; font-style: normal; font-size: 12px; margin-top: 4px; }
.doc-items th { padding: 8px 10px; font-size: 13px; text-align: left; font-weight: 500; color: #fff; }
.doc-items td { padding: 8px 10px; border-bottom: 1px solid #eee; }
.doc-items .num { text-align: right; width: 110px; }
.doc-totals { margin-top: 12px; display: flex; flex-direction: column; align-items: flex-end; gap: 6px; font-size: 14px; }
.doc-totals span { margin-right: 24px; }
.doc-totals .grand { font-size: 18px; font-weight: 700; border-top: 1px solid #ddd; padding-top: 8px; width: 240px; display: flex; justify-content: space-between; }
.doc-note { margin-top: 16px; font-size: 13px; white-space: pre-wrap; }
.doc-payment { margin-top: 12px; font-size: 13px; padding: 10px 12px; background: #fafafa; border-radius: 6px; }
.doc-payment .pay-label { font-weight: 600; display: inline-block; margin-right: 8px; }
.doc-foot { margin-top: 28px; text-align: center; font-size: 11px; }

/* ---------- 主题配色变量 ---------- */
#paper.theme-blue {
  --accent: #1677ff;
  --accent-light: #e6f0ff;
  --border: #1677ff;
  --head-bg: #1677ff;
  --parties-bg: #f0f6ff;
  --grand-color: #1677ff;
  --total-border: #1677ff;
  --foot-color: #999;
}
#paper.theme-green {
  --accent: #20a753;
  --accent-light: #e8f8ee;
  --border: #20a753;
  --head-bg: #20a753;
  --parties-bg: #e8f8ee;
  --grand-color: #20a753;
  --total-border: #20a753;
  --foot-color: #999;
}
#paper.theme-gold {
  --accent: #b89030;
  --accent-light: #faf3e0;
  --border: #b89030;
  --head-bg: #b89030;
  --parties-bg: #faf3e0;
  --grand-color: #b89030;
  --total-border: #b89030;
  --foot-color: #999;
}
#paper.theme-blue .doc-head { border-bottom-color: var(--border); }
#paper.theme-blue .doc-title { color: var(--accent); }
#paper.theme-blue .doc-parties > div { background: var(--parties-bg); }
#paper.theme-blue .doc-items th { background: var(--head-bg); }
#paper.theme-blue .doc-totals .grand { color: var(--grand-color); border-top-color: var(--total-border); }
#paper.theme-blue .doc-note { color: #555; }
#paper.theme-blue .doc-foot { color: var(--foot-color); }

#paper.theme-green .doc-head { border-bottom-color: var(--border); }
#paper.theme-green .doc-title { color: var(--accent); }
#paper.theme-green .doc-parties > div { background: var(--parties-bg); }
#paper.theme-green .doc-items th { background: var(--head-bg); }
#paper.theme-green .doc-totals .grand { color: var(--grand-color); border-top-color: var(--total-border); }
#paper.theme-green .doc-note { color: #555; }
#paper.theme-green .doc-foot { color: var(--foot-color); }

#paper.theme-gold .doc-head { border-bottom-color: var(--border); }
#paper.theme-gold .doc-title { color: var(--accent); }
#paper.theme-gold .doc-parties > div { background: var(--parties-bg); }
#paper.theme-gold .doc-items th { background: var(--head-bg); }
#paper.theme-gold .doc-totals .grand { color: var(--grand-color); border-top-color: var(--total-border); }
#paper.theme-gold .doc-note { color: #555; }
#paper.theme-gold .doc-foot { color: var(--foot-color); }

/* ---------- 打印 ---------- */
@media print {
  body { background: #fff; }
  header, #form-panel, .panel h2 { display: none !important; }
  main { display: block; padding: 0; }
  #preview-panel { box-shadow: none; border: none; padding: 0; }
  #paper { border: none; padding: 0; }
  #paper .doc-foot { display: none; }
}