* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f5f6f8; --card: #fff; --line: #e6e8eb; --text: #1f2329;
  --muted: #8a9099; --primary: #2b6de8; --primary-d: #1f57c4;
  --ok: #17a672; --warn: #e8912b; --err: #e2483d; --radius: 12px;
}
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); -webkit-font-smoothing: antialiased; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.err { color: var(--err); font-size: 14px; margin-top: 8px; min-height: 18px; }

/* 按钮 */
.btn { border: none; border-radius: 8px; padding: 10px 16px; font-size: 15px;
  cursor: pointer; background: #eef0f3; color: var(--text); transition: .15s; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-d); }
.btn.ghost { background: transparent; }
.btn.block { display: block; width: 100%; margin-top: 14px; padding: 13px; }
.btn.small { padding: 7px 12px; font-size: 13px; }
.btn.danger { background: #fbe9e8; color: var(--err); }

/* 登录 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-card { background: var(--card); border-radius: 16px; padding: 36px 28px;
  width: 100%; max-width: 360px; text-align: center; box-shadow: 0 8px 30px rgba(0,0,0,.06); }
.login-logo { font-size: 46px; }
.login-card h1 { font-size: 22px; margin: 10px 0 4px; }
.login-card input { width: 100%; padding: 13px; margin-top: 20px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 16px; }
.login-card input:focus { outline: none; border-color: var(--primary); }

/* 顶栏 */
.topbar { background: var(--card); display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 600; font-size: 17px; }
.month-pick { margin-left: auto; }
.month-pick input, .toolbar select, .export-card input, #exportMonth {
  padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; }

/* Tabs */
.tabs { display: flex; background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 57px; z-index: 9; overflow-x: auto; }
.tab { flex: 1; padding: 13px 8px; border: none; background: none; font-size: 15px;
  color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; white-space: nowrap; }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

.content { padding: 16px; max-width: 900px; margin: 0 auto; }

/* 统计条 */
.stats { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 12px; }
.stat-chip { background: var(--card); border-radius: 10px; padding: 10px 14px; min-width: 90px;
  border: 1px solid var(--line); flex-shrink: 0; }
.stat-chip .n { font-size: 20px; font-weight: 700; }
.stat-chip .l { font-size: 12px; color: var(--muted); }
.stat-chip.warn .n { color: var(--warn); }

.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; }
.toolbar select { flex: 1; }

/* 卡片列表 */
.cards { display: flex; flex-direction: column; gap: 10px; }
.inv-card { background: var(--card); border-radius: var(--radius); padding: 14px;
  border: 1px solid var(--line); display: flex; gap: 12px; align-items: center; cursor: pointer; }
.inv-card:active { background: #fafbfc; }
.inv-thumb { width: 46px; height: 46px; border-radius: 8px; background: #eef0f3;
  display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.inv-main { flex: 1; min-width: 0; }
.inv-seller { font-weight: 600; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.inv-meta { font-size: 13px; color: var(--muted); margin-top: 3px; }
.inv-amt { font-size: 17px; font-weight: 700; color: var(--text); white-space: nowrap; }
.tag { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 20px;
  background: #eaf1fe; color: var(--primary); margin-right: 6px; }
.tag.pending { background: #fff3e0; color: var(--warn); }
.tag.failed { background: #fbe9e8; color: var(--err); }

/* 上传区 */
.upload-zone { background: var(--card); border: 2px dashed var(--line); border-radius: var(--radius);
  padding: 44px 20px; text-align: center; cursor: pointer; transition: .15s; }
.upload-zone.drag { border-color: var(--primary); background: #f5f9ff; }
.up-icon { font-size: 46px; margin-bottom: 8px; }
#uploadStatus { margin-top: 14px; }
.up-item { background: var(--card); border-radius: 8px; padding: 10px 14px; margin-top: 8px;
  border: 1px solid var(--line); font-size: 14px; display: flex; justify-content: space-between; }

/* 导出 */
.export-card { background: var(--card); border-radius: var(--radius); padding: 24px;
  border: 1px solid var(--line); }
.export-card h3 { margin-bottom: 8px; }
.export-card input { width: 100%; margin-top: 16px; padding: 12px; }

/* 弹窗 */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.5); display: flex;
  align-items: flex-end; justify-content: center; z-index: 100; }
.modal-box { background: var(--card); border-radius: 16px 16px 0 0; width: 100%; max-width: 560px;
  max-height: 92vh; overflow-y: auto; padding: 22px; }
.modal-box h3 { margin-bottom: 16px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.field input, .field select { width: 100%; padding: 11px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 15px; }
.field input:focus, .field select:focus { outline: none; border-color: var(--primary); }
.modal-actions { display: flex; gap: 10px; margin-top: 18px; }
.modal-actions .btn { flex: 1; }
.qr-img { display: block; margin: 12px auto; width: 220px; height: 220px; }
.preview-frame { width: 100%; height: 300px; border: 1px solid var(--line); border-radius: 8px; margin-top: 10px; }

@media (min-width: 640px) {
  .modal { align-items: center; }
  .modal-box { border-radius: 16px; }
  .cards { display: grid; grid-template-columns: 1fr 1fr; }
}