:root{
    --bg:#f4f6fa; --panel:#ffffff; --border:#e4e8f0; --text:#1f2937; --muted:#6b7280;
    --primary:#2563eb; --primary-soft:#eff6ff; --danger:#dc2626; --ok:#16a34a;
    --up:#dc2626; --down:#16a34a; /* 费用增加=红 */
    --radius:10px; --shadow:0 1px 3px rgba(16,24,40,.06),0 1px 2px rgba(16,24,40,.04);
  }
  *{box-sizing:border-box;margin:0;padding:0}
  body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);font-size:14px}
  .app{display:flex;min-height:100vh}
  .app[hidden]{display:none}
  /* 侧边栏 */
  .sidebar{width:220px;background:#0f1e3d;color:#cbd5e1;flex-shrink:0;position:sticky;top:0;height:100vh;overflow:hidden;display:flex;flex-direction:column}
  .nav{flex:1 1 auto;overflow-y:auto;min-height:0}
  .logo{padding:20px 18px;font-size:17px;font-weight:700;color:#fff;border-bottom:1px solid rgba(255,255,255,.08);letter-spacing:.5px}
  .logo small{display:block;font-size:11px;font-weight:400;color:#94a3b8;margin-top:3px}
  .nav a{display:flex;align-items:center;gap:10px;padding:11px 18px;color:#cbd5e1;text-decoration:none;font-size:13.5px;border-left:3px solid transparent}
  .nav a:hover{background:rgba(255,255,255,.06);color:#fff}
  .nav a.active{background:rgba(37,99,235,.25);color:#fff;border-left-color:var(--primary)}
  .nav .icon{width:18px;text-align:center;opacity:.9}
  /* 主区 */
  .main{flex:1;padding:24px 28px;max-width:1400px;min-width:0}
  .page-title{font-size:20px;font-weight:700;margin-bottom:4px}
  .page-sub{color:var(--muted);font-size:13px;margin-bottom:20px}
  .card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:18px}
  .card h3{font-size:15px;margin-bottom:14px;display:flex;align-items:center;justify-content:space-between;gap:10px}
  /* KPI */
  .kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-bottom:18px}
  .kpi{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px}
  .kpi .label{color:var(--muted);font-size:12.5px;margin-bottom:6px}
  .kpi .value{font-size:24px;font-weight:700}
  .kpi .delta{font-size:12px;margin-top:5px}
  .pos{color:var(--up)} .neg{color:var(--down)} .muted{color:var(--muted)}
  /* 表格 */
  table{width:100%;border-collapse:collapse;font-size:13px}
  th{background:#f8fafc;color:#475569;font-weight:600;text-align:right;padding:9px 10px;border-bottom:1px solid var(--border);white-space:nowrap}
  td{padding:9px 10px;border-bottom:1px solid #eef1f6;text-align:right;white-space:nowrap}
  th:first-child,td:first-child{text-align:left}
  tbody tr:hover{background:#f8faff}
  tfoot td{font-weight:700;background:#f8fafc;border-top:2px solid var(--border)}
  .num{font-variant-numeric:tabular-nums}
  .table-wrap{overflow-x:auto}
  .delta-cell{font-size:11.5px;display:block}
  /* 表单 */
  .form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
  .field label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
  .field input,.field select,.field textarea{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:7px;font-size:13px;background:#fff;color:var(--text)}
  .field input:focus,.field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
  .btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border:none;border-radius:7px;font-size:13px;cursor:pointer;background:var(--primary);color:#fff;font-weight:500}
  .btn:hover{background:#1d4ed8}
  .btn.secondary{background:#fff;color:var(--text);border:1px solid var(--border)}
  .btn.secondary:hover{background:#f3f4f6}
  .btn.danger{background:#fff;color:var(--danger);border:1px solid #fecaca}
  .btn.danger:hover{background:#fef2f2}
  .btn.sm{padding:4px 10px;font-size:12px}
  .toolbar{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-bottom:16px}
  .toolbar .field{min-width:170px}
  .tag{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11.5px;font-weight:500}
  .tag.blue{background:var(--primary-soft);color:var(--primary)}
  .tag.green{background:#f0fdf4;color:var(--ok)}
  .tag.purple{background:#f5f3ff;color:#7c3aed}
  .tag.gray{background:#f1f5f9;color:#475569}
  .empty{text-align:center;color:var(--muted);padding:36px 0;font-size:13px}
  /* 首页图表条形 */
  .bar-row{display:flex;align-items:center;gap:10px;margin-bottom:10px}
  .bar-row .bar-name{width:110px;font-size:12.5px;flex-shrink:0;text-align:right;color:#475569}
  .bar-track{flex:1;background:#eef1f6;border-radius:6px;height:18px;overflow:hidden}
  .bar-fill{height:100%;background:linear-gradient(90deg,#3b82f6,#2563eb);border-radius:6px;min-width:2px}
  .bar-val{width:110px;font-size:12px;text-align:left;font-variant-numeric:tabular-nums}
  /* 趋势图网格 */
  .chart-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(420px,1fr));gap:16px;margin-bottom:18px}
  .chart-grid .card{margin-bottom:0}
  .chart-grid .card h3{margin-bottom:6px;font-size:13.5px}
  .chart-note{font-size:11.5px;font-weight:400;color:var(--muted)}
  .tabs{display:flex;gap:6px;margin-bottom:16px;border-bottom:1px solid var(--border);flex-wrap:wrap}
  .tabs button{padding:9px 18px;border:none;background:none;font-size:13.5px;cursor:pointer;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px}
  .tabs button.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}
  .month-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
  .chip{padding:6px 14px;border-radius:20px;border:1px solid var(--border);background:#fff;font-size:12.5px;cursor:pointer}
  .chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}
  .hint{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.7}
  .info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
  .info-item{background:#f8fafc;border:1px solid var(--border);border-radius:8px;padding:12px 14px}
  .info-item .k{font-size:11.5px;color:var(--muted);margin-bottom:4px}
  .info-item .v{font-size:14px;font-weight:600}
  .inline-inputs{display:flex;gap:6px;align-items:center}
  td input.mini{width:90px;padding:5px 7px;border:1px solid var(--border);border-radius:6px;font-size:12.5px;text-align:right}
  td input.wide{width:160px;padding:5px 7px;border:1px solid var(--border);border-radius:6px;font-size:12.5px}
  td input.mini:focus,td input.wide:focus{outline:none;border-color:var(--primary)}
  .toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:#111827;color:#fff;padding:10px 22px;border-radius:8px;font-size:13px;opacity:0;transition:opacity .25s;pointer-events:none;z-index:99}
  .toast.show{opacity:.95}
  .sub-label{font-size:13px;font-weight:600;color:#475569;margin:14px 0 10px}
  /* 侧边栏 · 当前用户 */
  .side-user{flex:0 0 auto;padding:14px 16px 16px;border-top:1px solid rgba(255,255,255,.08);background:rgba(0,0,0,.12)}
  .side-user .su-account{font-size:11px;color:#94a3b8;margin-bottom:10px}
  .side-user .su-actions{display:flex;gap:8px}
  .side-user .su-lang{flex:0 0 64px;padding:7px 0;border:1px solid rgba(255,255,255,.2);background:transparent;color:#cbd5e1;border-radius:7px;font-size:12px;cursor:pointer;line-height:1;white-space:nowrap}
  .side-user .su-lang:hover{background:rgba(255,255,255,.1);color:#fff}
  .side-user .su-out{flex:1;padding:7px 0;border:1px solid rgba(255,255,255,.2);background:transparent;color:#cbd5e1;border-radius:7px;font-size:12.5px;cursor:pointer}
  .side-user .su-out:hover{background:rgba(255,255,255,.1);color:#fff}
  /* 语言切换（登录页 · 左下角悬浮，进入应用后隐藏） */
  .lang-fab{position:fixed;left:18px;bottom:18px;z-index:300;padding:8px 16px;border:1px solid rgba(255,255,255,.35);
    background:rgba(255,255,255,.12);color:#fff;border-radius:20px;font-size:13px;cursor:pointer;backdrop-filter:blur(4px);font-family:inherit}
  .lang-fab:hover{background:rgba(255,255,255,.24)}
  .login-page[hidden] ~ .lang-fab{display:none}
  /* 登录页 */
  .login-page{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:24px;
    background:linear-gradient(135deg,#0f1e3d 0%,#1b3a75 55%,#2563eb 100%)}
  .login-page[hidden]{display:none}
  .login-card{width:100%;max-width:372px;background:#fff;border-radius:14px;padding:34px 32px 26px;
    box-shadow:0 22px 56px rgba(6,14,36,.34)}
  .login-brand{font-size:19px;font-weight:700;letter-spacing:.5px;color:var(--text)}
  .login-brand small{display:block;font-size:11px;font-weight:400;color:var(--muted);margin-top:4px;letter-spacing:.7px}
  .login-field{margin-top:16px}
  .login-field label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}
  .login-field input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;background:#fff;color:var(--text)}
  .login-field input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
  .login-btn{width:100%;margin-top:20px;padding:11px 0;border:none;border-radius:8px;background:var(--primary);color:#fff;
    font-size:14.5px;font-weight:600;letter-spacing:3px;cursor:pointer;font-family:inherit}
  .login-btn:hover{background:#1d4ed8}
  .login-btn:disabled{opacity:.65;cursor:default}
  .login-err{min-height:17px;margin-top:10px;font-size:12.5px;color:var(--danger);text-align:center;line-height:1.5}
  .login-foot{margin-top:18px;padding-top:14px;border-top:1px solid var(--border);text-align:center;font-size:11.5px;color:var(--muted)}