:root{
  --blue:#1a56db;
  --blue-light:#e8f0fe;
  --blue-dark:#123a99;
  --cyan:#0ea5b7;
  --bg:#f3f5f9;
  --card:#ffffff;
  --border:#e3e7ee;
  --text:#1f2937;
  --text-sub:#6b7280;
  --danger:#e0433f;
  --success:#0f9d58;
  --radius:10px;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:14px;
}
/* ---------- 登录页 ---------- */
#loginScreen{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(135deg,#0f2a63 0%,#123a99 45%,#0ea5b7 100%);
}
.login-box{
  width:360px;
  background:var(--card);
  border-radius:14px;
  padding:36px 32px 30px;
  box-shadow:0 20px 60px rgba(10,30,80,.35);
}
.login-logo{
  text-align:center;
  margin-bottom:6px;
  font-size:20px;
  font-weight:700;
  color:var(--blue-dark);
  letter-spacing:1px;
}
.login-sub{
  text-align:center;
  color:var(--text-sub);
  font-size:12px;
  margin-bottom:26px;
}
.field{ margin-bottom:16px; }
.field label{ display:block; font-size:12px; color:var(--text-sub); margin-bottom:6px; }
.field input, .field select{
  width:100%;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:8px;
  font-size:14px;
  outline:none;
  background:#fafbfd;
}
.field input:focus, .field select:focus{ border-color:var(--blue); background:#fff; }
.field-error{ color:var(--danger); font-size:12px; margin-top:-6px; margin-bottom:14px; min-height:1px; }
.btn{
  display:inline-block;
  border:none;
  border-radius:8px;
  padding:10px 18px;
  font-size:14px;
  cursor:pointer;
  transition:.15s;
}
.btn:disabled{ opacity:.6; cursor:not-allowed; }
.btn-primary{ background:var(--blue); color:#fff; }
.btn-primary:hover{ background:var(--blue-dark); }
.btn-block{ width:100%; padding:11px; font-size:15px; }
.btn-plain{ background:#fff; color:var(--text); border:1px solid var(--border); }
.btn-plain:hover{ border-color:var(--blue); color:var(--blue); }
.btn-danger{ background:#fff; color:var(--danger); border:1px solid #f3c9c8; }
.btn-danger:hover{ background:#fdecec; }
.login-hint{
  margin-top:16px;
  font-size:12px;
  color:var(--text-sub);
  text-align:center;
  background:var(--blue-light);
  padding:8px 10px;
  border-radius:8px;
}
/* ---------- 主界面 ---------- */
#app{ display:none; min-height:100vh; }
.topbar{
  height:56px;
  background:#fff;
  border-bottom:1px solid var(--border);
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 22px;
  position:sticky;
  top:0;
  z-index:50;
}
.brand{ display:flex; align-items:center; gap:10px; font-weight:700; color:var(--blue-dark); font-size:16px;}
.brand .dot{ width:10px; height:10px; border-radius:3px; background:linear-gradient(135deg,var(--blue),var(--cyan)); display:inline-block;}
.tabs{ display:flex; gap:4px; }
.tab{
  padding:8px 16px;
  border-radius:8px;
  cursor:pointer;
  color:var(--text-sub);
  font-size:14px;
}
.tab.active{ background:var(--blue-light); color:var(--blue-dark); font-weight:600; }
.tab:hover:not(.active){ background:#f3f4f6; }
.topbar-right{ display:flex; align-items:center; gap:14px; font-size:13px; color:var(--text-sub); }
main{ padding:22px; max-width:1180px; margin:0 auto; }
.card{
  background:var(--card);
  border-radius:var(--radius);
  border:1px solid var(--border);
  padding:20px;
  margin-bottom:18px;
}
.card-title{ font-size:15px; font-weight:700; margin:0 0 14px; display:flex; align-items:center; justify-content:space-between;}
.card-title .sub{ font-size:12px; font-weight:400; color:var(--text-sub); }
.grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
table{ width:100%; border-collapse:collapse; font-size:14px; }
th,td{ border:1px solid var(--border); padding:9px 10px; text-align:left; }
th{ background:#f7f9fc; font-weight:600; color:var(--text-sub); font-size:13px; }
tr:hover td{ background:#fafcff; }
.cell-input{
  width:100%;
  border:1px solid transparent;
  background:transparent;
  padding:4px 6px;
  border-radius:6px;
  font-size:14px;
  font-family:inherit;
}
.cell-input:focus{ border-color:var(--blue); background:#fff; outline:none; }
.cell-input:disabled{ color:var(--text-sub); background:transparent; }
select.cell-input{ cursor:pointer; }
.num{ text-align:right; font-variant-numeric:tabular-nums; }
.profit-pos{ color:var(--success); font-weight:600; }
.total-row td{ background:#f7f9fc; font-weight:700; }
.total-row .grand{ color:var(--blue-dark); }
.toolbar{ display:flex; gap:10px; margin-bottom:14px; flex-wrap:wrap; align-items:center;}
.toolbar .spacer{ flex:1; }
.badge{ display:inline-block; padding:2px 9px; border-radius:20px; font-size:12px; }
.badge-on{ background:#e6f7ee; color:var(--success); }
.badge-off{ background:#fdecec; color:var(--danger); }
.link-btn{ color:var(--blue); cursor:pointer; font-size:13px; margin-right:10px; }
.link-btn:hover{ text-decoration:underline; }
.link-btn.danger{ color:var(--danger); }
input[type=text], input[type=tel], input[type=date], input[type=password]{
  padding:9px 10px; border:1px solid var(--border); border-radius:8px; width:100%; font-size:14px;
}
.field-inline label{ font-size:12px; color:var(--text-sub); display:block; margin-bottom:5px;}
/* modal */
.mask{ position:fixed; inset:0; background:rgba(15,25,50,.45); display:none; align-items:center; justify-content:center; z-index:100;}
.modal{ width:420px; background:#fff; border-radius:12px; padding:22px; }
.modal h3{ margin:0 0 16px; font-size:16px; }
.modal .field{ margin-bottom:14px; }
.modal-actions{ display:flex; justify-content:flex-end; gap:10px; margin-top:6px; }
.empty{ text-align:center; color:var(--text-sub); padding:40px 0; font-size:13px; }
.toast{
  position:fixed; top:20px; left:50%; transform:translateX(-50%);
  background:#1f2937; color:#fff; padding:10px 22px; border-radius:8px; font-size:13px;
  display:none; z-index:200; box-shadow:0 8px 24px rgba(0,0,0,.2);
}
.history-banner{
  display:flex; align-items:center; justify-content:space-between;
  background:#fff4e0; color:#8a5a00; border-radius:8px; padding:10px 14px; margin-bottom:14px; font-size:13px;
}
@media print{
  .topbar, .toolbar, .no-print, .history-banner{ display:none !important; }
  main{ padding:0; max-width:none; }
  .card{ border:none; }
  body.hide-cost .col-cost{ display:none !important; }
  body.hide-refprice .col-refprice{ display:none !important; }
  body.hide-sale .col-sale{ display:none !important; }
  body.hide-profit .col-profit{ display:none !important; }
}
.export-settings{
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
  background:var(--blue-light); border-radius:8px; padding:8px 14px; font-size:13px; color:var(--blue-dark);
}
.export-settings .es-title{ font-weight:600; }
.export-settings label{ display:inline-flex; align-items:center; gap:5px; cursor:pointer; color:var(--text); }
.export-settings input[type=checkbox]{ width:auto; accent-color:var(--blue); cursor:pointer; }
body.role-user .admin-only{ display:none !important; }
body.role-user .col-cost, body.role-user .col-profit{ display:none !important; }
.role-tag{ display:inline-block; padding:2px 10px; border-radius:20px; font-size:12px; margin-left:6px; }
.role-tag.admin{ background:#e6f7ee; color:var(--success); }
.role-tag.user{ background:#fff4e0; color:#b8720a; }
.cat-chip{
  display:inline-flex; align-items:center; gap:6px; background:#eef2f9; border-radius:20px;
  padding:5px 12px; font-size:13px; margin:0 8px 8px 0;
}
.cat-chip .link-btn{ margin:0; font-size:12px; }
.profit-alert{
  margin-top:12px; padding:10px 14px; border-radius:8px; font-size:13px;
  background:#eef2f9; color:var(--text);
}
.profit-alert.low-margin{ background:#fdecec; color:var(--danger); }
.profit-warning{ font-weight:700; margin-left:10px; }