:root{
  --blue:#1a73e8;--blue-light:#e8f0fe;--blue-dark:#1557b0;
  --green:#1e8a4a;--green-light:#e6f4ea;--green-dark:#145c32;
  --amber:#b45309;--amber-light:#fef3c7;--amber-dark:#92400e;
  --red:#c0392b;--red-light:#fdecea;--red-dark:#922b21;
  --purple:#6d28d9;--purple-light:#ede9fe;--purple-dark:#4c1d95;
  --gray-50:#f8f9fa;--gray-100:#f1f3f4;--gray-200:#e8eaed;
  --gray-300:#dadce0;--gray-400:#bdc1c6;--gray-600:#80868b;
  --gray-700:#5f6368;--gray-800:#3c4043;--gray-900:#202124;
  --radius:8px;--radius-lg:12px;
  --shadow:0 1px 3px rgba(0,0,0,.12),0 1px 2px rgba(0,0,0,.08);
  --shadow-md:0 4px 12px rgba(0,0,0,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Noto Sans TC',Arial,sans-serif;font-size:14px;background:#f0f4f8;color:var(--gray-900);min-height:100vh}

/* Header */
.app-header{background:var(--blue);color:white;padding:0 24px;height:56px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow-md);position:sticky;top:0;z-index:100}
.app-header h1{font-size:17px;font-weight:600;letter-spacing:.3px}
.app-header .sub{font-size:12px;opacity:.85;margin-top:2px}
.header-right{display:flex;align-items:center;gap:10px;flex-wrap:nowrap}
.header-badge{background:rgba(255,255,255,.2);border-radius:20px;padding:4px 14px;font-size:12px;font-weight:500;white-space:nowrap}
.btn-header{background:rgba(255,255,255,.15);border:1.5px solid rgba(255,255,255,.4);color:white;border-radius:20px;padding:5px 14px;font-size:12px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:5px;transition:background .15s;white-space:nowrap}
.btn-header:hover{background:rgba(255,255,255,.28)}
.user-info{display:flex;align-items:center;gap:8px;font-size:13px}
.user-badge{background:rgba(255,255,255,.2);border-radius:20px;padding:4px 12px;font-size:12px}

/* Tabs */
.tab-bar{background:white;border-bottom:2px solid var(--gray-200);display:flex;padding:0 12px;box-shadow:0 1px 3px rgba(0,0,0,.06);flex-wrap:wrap;position:sticky;top:56px;z-index:99}
.tab-btn{padding:13px 16px;border:none;background:none;cursor:pointer;font-size:13px;font-weight:500;color:var(--gray-600);border-bottom:3px solid transparent;margin-bottom:-2px;display:flex;align-items:center;gap:6px;transition:color .15s}
.tab-btn:hover{color:var(--gray-900);background:var(--gray-50)}
.tab-btn.active{color:var(--blue);border-bottom-color:var(--blue)}
.tab-btn .tab-icon{width:18px;height:18px;display:inline-flex;align-items:center;justify-content:center;border-radius:4px;font-size:14px}
.tab-btn.active .tab-icon{background:var(--blue-light)}

/* Main */
.main{max-width:980px;margin:24px auto;padding:0 16px}
.section{display:none}.section.active{display:block}

/* Cards */
.card{background:white;border-radius:var(--radius-lg);box-shadow:var(--shadow);margin-bottom:20px;overflow:hidden}
.card-header{padding:16px 20px;border-bottom:2px solid var(--gray-100);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.card-header h2{font-size:15px;font-weight:600;color:var(--gray-900);display:flex;align-items:center;gap:8px}
.card-header h2 .icon{width:28px;height:28px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:15px}
.card-body{padding:20px}
.ch-blue .icon{background:var(--blue-light)}
.ch-green .icon{background:var(--green-light)}
.ch-amber .icon{background:var(--amber-light)}
.ch-purple .icon{background:var(--purple-light)}
.ch-red .icon{background:var(--red-light)}

/* Forms */
.form-row{display:flex;gap:12px;margin-bottom:14px;align-items:flex-end;flex-wrap:wrap}
.form-group{display:flex;flex-direction:column;gap:5px}
.form-group label{font-size:12px;font-weight:600;color:var(--gray-700);text-transform:uppercase;letter-spacing:.4px}
.form-group input,.form-group select,.form-group textarea{padding:9px 12px;border:1.5px solid var(--gray-300);border-radius:var(--radius);font-size:14px;color:var(--gray-900);background:white;transition:border-color .15s,box-shadow .15s;font-family:inherit}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,115,232,.15)}
.form-group.w-sm input{width:80px}.form-group.w-md input{width:110px}.form-group.flex1{flex:1;min-width:120px}
textarea{width:100%;resize:vertical;font-family:monospace}

/* Buttons */
.btn{padding:9px 18px;border-radius:var(--radius);font-size:13px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all .15s;border:none;letter-spacing:.2px}
.btn-blue{background:var(--blue);color:white}.btn-blue:hover{background:var(--blue-dark)}
.btn-green{background:var(--green);color:white}.btn-green:hover{background:var(--green-dark)}
.btn-amber{background:var(--amber);color:white}.btn-amber:hover{background:var(--amber-dark)}
.btn-ghost{background:var(--gray-100);color:var(--gray-800);border:1.5px solid var(--gray-300)}.btn-ghost:hover{background:var(--gray-200)}
.btn-red-ghost{background:var(--red-light);color:var(--red);border:1.5px solid #f5c6c2}.btn-red-ghost:hover{background:#fbdad8}
.btn-orange-ghost{background:var(--amber-light);color:var(--amber-dark);border:1.5px solid #fcd34d}.btn-orange-ghost:hover{background:#fde68a}
.btn-sm{padding:5px 12px;font-size:12px}
.btn-group{display:flex;gap:8px;justify-content:flex-end;margin-top:12px;flex-wrap:wrap}

/* Tables */
.tbl-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13px}
thead tr{background:var(--gray-50)}
th{padding:11px 14px;text-align:left;font-weight:600;color:var(--gray-700);font-size:12px;text-transform:uppercase;letter-spacing:.4px;border-bottom:2px solid var(--gray-200)}
td{padding:10px 14px;border-bottom:1px solid var(--gray-100);color:var(--gray-900);vertical-align:middle}
tbody tr:hover{background:var(--gray-50)}
tr:last-child td{border-bottom:none}
tr.total-row td{background:var(--blue-light);font-weight:700;color:var(--blue-dark);border-top:2px solid var(--blue)}

/* Badges */
.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600}
.badge-blue{background:var(--blue-light);color:var(--blue-dark)}
.badge-green{background:var(--green-light);color:var(--green-dark)}
.badge-gray{background:var(--gray-200);color:var(--gray-700)}
.badge-amber{background:var(--amber-light);color:var(--amber-dark)}
.badge-red{background:var(--red-light);color:var(--red-dark)}
.badge-purple{background:var(--purple-light);color:var(--purple-dark)}

/* Category bars */
.cat-bar{padding:8px 16px;font-size:11px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;display:flex;align-items:center;gap:8px}
.cat-bar.c-blue{background:var(--blue-light);color:var(--blue-dark)}
.cat-bar.c-green{background:var(--green-light);color:var(--green-dark)}
.cat-bar.c-amber{background:var(--amber-light);color:var(--amber-dark)}
.cat-bar.c-purple{background:var(--purple-light);color:var(--purple-dark)}
.cat-bar.c-red{background:var(--red-light);color:var(--red-dark)}
.chk-row{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--gray-100);transition:background .1s}
.chk-row:hover{background:var(--gray-50)}
.chk-row:last-child{border-bottom:none}
.chk-label{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:14px}
.chk-label input[type=checkbox]{width:16px;height:16px;accent-color:var(--blue);cursor:pointer}
.chk-price{font-size:13px;font-weight:600;color:var(--gray-700);background:var(--gray-100);padding:2px 10px;border-radius:20px}

/* Stat cards */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:20px}
.stat-card{border-radius:var(--radius-lg);padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.stat-card.sc-blue{background:var(--blue-light);border-left:4px solid var(--blue)}
.stat-card.sc-green{background:var(--green-light);border-left:4px solid var(--green)}
.stat-card.sc-amber{background:var(--amber-light);border-left:4px solid var(--amber)}
.stat-card.sc-red{background:var(--red-light);border-left:4px solid var(--red)}
.stat-label{font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase}
.sc-blue .stat-label{color:var(--blue)}.sc-green .stat-label{color:var(--green)}.sc-amber .stat-label{color:var(--amber)}.sc-red .stat-label{color:var(--red)}
.stat-val{font-size:22px;font-weight:700;color:var(--gray-900)}
.stat-sub{font-size:11px;color:var(--gray-600)}

/* Subtotal bar */
.subtotal-bar{background:var(--blue-light);border:1.5px solid #bfdbfe;border-radius:var(--radius);padding:12px 16px;display:flex;align-items:center;justify-content:space-between;margin-top:12px}
.subtotal-label{font-size:13px;font-weight:600;color:var(--blue-dark)}
.subtotal-val{font-size:20px;font-weight:700;color:var(--blue)}

/* Messages */
.msg{padding:10px 14px;border-radius:var(--radius);font-size:13px;font-weight:500;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.msg-success{background:var(--green-light);color:var(--green-dark);border-left:4px solid var(--green)}
.msg-error{background:var(--red-light);color:var(--red-dark);border-left:4px solid var(--red)}
.msg-info{background:var(--blue-light);color:var(--blue-dark);border-left:4px solid var(--blue)}

/* Filter bar */
.filter-bar{background:var(--gray-50);border:1.5px solid var(--gray-200);border-radius:var(--radius);padding:14px 16px;margin-bottom:16px;display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap}
.divider{border:none;border-top:1.5px solid var(--gray-200);margin:18px 0}
.empty{text-align:center;padding:40px 20px;color:var(--gray-600)}
.empty .empty-icon{font-size:36px;margin-bottom:10px;opacity:.4}

/* Price history */
.price-history-row{font-size:11px;color:var(--gray-600);padding:2px 0}
.price-change{display:inline-flex;align-items:center;gap:4px;margin-left:4px}
.price-old{text-decoration:line-through;color:var(--red)}
.price-new{color:var(--green-dark);font-weight:600}
.price-arrow{color:var(--gray-400)}

/* Summary diff */
.diff-plus{color:var(--red-dark);font-weight:700;background:var(--red-light);padding:2px 8px;border-radius:12px;font-size:12px}
.diff-minus{color:var(--green-dark);font-weight:700;background:var(--green-light);padding:2px 8px;border-radius:12px;font-size:12px}
.diff-zero{color:var(--gray-600);font-size:12px}

/* Receipt */
.receipt-wrap{border:2px solid var(--gray-300);border-radius:var(--radius-lg);overflow:hidden}
.receipt-half{padding:20px 24px;border-bottom:2px dashed var(--gray-300)}
.receipt-half:last-child{border-bottom:none}
.r-school{text-align:center;font-size:11px;font-weight:700;letter-spacing:1px;color:var(--gray-600);margin-bottom:4px}
.r-title{text-align:center;font-size:18px;font-weight:700;color:var(--gray-900);margin-bottom:2px}
.r-date{text-align:center;font-size:12px;color:var(--gray-600);margin-bottom:14px}
.r-info-bar{display:flex;border:1.5px solid var(--gray-300);border-radius:var(--radius);overflow:hidden;margin-bottom:14px}
.r-info-cell{flex:1;padding:8px 12px;background:var(--gray-50)}
.r-info-cell:not(:last-child){border-right:1.5px solid var(--gray-300)}
.r-info-cell .lbl{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--gray-600);margin-bottom:2px}
.r-info-cell .val{font-size:14px;font-weight:600;color:var(--gray-900)}
.r-table{width:100%;border-collapse:collapse;font-size:12px;margin-bottom:10px}
.r-table th{padding:6px 10px;background:var(--blue);color:white;text-align:left;font-weight:600;font-size:11px}
.r-table td{padding:6px 10px;border-bottom:1px solid var(--gray-100)}
.r-total-row{display:flex;justify-content:space-between;align-items:center;background:var(--blue);color:white;padding:10px 12px;border-radius:var(--radius);margin-top:4px}
.r-total-row .tl{font-size:13px;font-weight:600}
.r-total-row .tv{font-size:18px;font-weight:700}
.r-footer{text-align:center;font-size:10px;color:var(--gray-600);margin-top:10px;padding-top:8px;border-top:1px dashed var(--gray-300)}

/* Log viewer */
.log-line{font-family:monospace;font-size:12px;padding:4px 8px;border-bottom:1px solid var(--gray-100);white-space:pre-wrap;word-break:break-all;line-height:1.6}
.log-line:nth-child(odd){background:var(--gray-50)}

/* Modal */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:200;align-items:center;justify-content:center}
.modal-overlay.open{display:flex}
.modal{background:white;border-radius:var(--radius-lg);padding:28px;width:400px;max-width:90vw;box-shadow:var(--shadow-md)}
.modal h3{font-size:16px;font-weight:600;margin-bottom:20px}
.modal-footer{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}

/* Print */
#print-area{display:none}
@media print{
  body>*{display:none!important}
  #print-area{display:block!important}
  .p-half{width:100%;height:50vh;padding:10mm 14mm;border-bottom:1.5pt dashed #aaa;display:flex;flex-direction:column;page-break-inside:avoid}
  .p-half:last-child{border-bottom:none}
  .p-school{text-align:center;font-size:9pt;letter-spacing:1px;color:#666;margin-bottom:2mm}
  .p-title{text-align:center;font-size:16pt;font-weight:bold;margin-bottom:1mm}
  .p-date{text-align:center;font-size:9pt;color:#555;margin-bottom:4mm}
  .p-info{display:flex;border:.5pt solid #ccc;overflow:hidden;margin-bottom:4mm}
  .p-info-cell{flex:1;padding:3mm 4mm;border-right:.5pt solid #ccc}
  .p-info-cell:last-child{border-right:none}
  .p-info-cell .lbl{font-size:7pt;font-weight:bold;color:#666;text-transform:uppercase;display:block;margin-bottom:1mm}
  .p-info-cell .val{font-size:12pt;font-weight:bold}
  .p-table{width:100%;border-collapse:collapse;font-size:9pt;margin-bottom:3mm}
  .p-table th{background:#1a73e8;color:white;padding:2mm 3mm;text-align:left;font-weight:bold}
  .p-table td{padding:1.5mm 3mm;border-bottom:.3pt solid #ddd}
  .p-total{display:flex;justify-content:space-between;background:#1a73e8;color:white;padding:3mm 4mm;margin-top:2mm}
  .p-total .tl{font-size:11pt;font-weight:600}
  .p-total .tv{font-size:14pt;font-weight:bold}
  .p-footer{text-align:center;font-size:7pt;color:#888;margin-top:3mm;padding-top:2mm;border-top:.5pt dashed #ccc}
  .p-blank{display:flex;align-items:center;justify-content:center;height:100%;color:#bbb;font-size:12pt;border:1pt dashed #ddd}
}