:root{
  --bg:#f4f6fb; --card:#fff; --line:#e3e8f0; --ink:#1f2a44; --muted:#6b7793;
  --brand:#1857c4; --brand-d:#0f3d8f; --accent:#0fa36b; --warn:#e0901a; --danger:#d2453d;
  --chip:#eef3ff; --radius:12px; --shadow:0 1px 3px rgba(20,40,80,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI","Sarabun",system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:14px}
button{font-family:inherit;cursor:pointer}
a{color:var(--brand);text-decoration:none}
input,select,textarea{font-family:inherit;font-size:14px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand);border-color:var(--brand)}
label{font-size:12px;color:var(--muted);display:block;margin-bottom:4px;font-weight:600}
.row{display:flex;gap:12px;flex-wrap:wrap}
.col{flex:1;min-width:160px}

/* Login */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1857c4,#0f3d8f)}
.login-card{background:#fff;padding:36px;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.25);width:360px}
.login-card h1{margin:0 0 4px;font-size:22px;color:var(--brand)}
.login-card p{margin:0 0 22px;color:var(--muted);font-size:13px}
.login-card .field{margin-bottom:14px}
.hint{font-size:12px;color:var(--muted);margin-top:14px;text-align:center}

/* Layout */
.app{display:grid;grid-template-columns:230px 1fr;min-height:100vh}
.sidebar{background:#0f1f3d;color:#cdd7ee;padding:16px 0;position:sticky;top:0;height:100vh;overflow:auto}
.brand{padding:0 18px 16px;border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:10px}
.brand b{display:block;color:#fff;font-size:15px;line-height:1.3}
.brand span{font-size:11px;color:#8fa3cc}
.nav-group{font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:#5e74a3;padding:14px 18px 6px}
.nav a{display:flex;align-items:center;gap:10px;padding:9px 18px;color:#cdd7ee;font-size:13.5px;border-left:3px solid transparent}
.nav a:hover{background:rgba(255,255,255,.05)}
.nav a.active{background:rgba(24,87,196,.35);border-left-color:#4d8bff;color:#fff;font-weight:600}
.nav a .ic{width:18px;text-align:center}

.main{display:flex;flex-direction:column;min-width:0}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:10px 22px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20}
.topbar h2{margin:0;font-size:17px}
.topbar .right{display:flex;align-items:center;gap:14px}
.userchip{font-size:13px;color:var(--muted)}
.langtoggle{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.langtoggle button{border:0;background:#fff;padding:5px 10px;font-size:12px;font-weight:700;color:var(--muted)}
.langtoggle button.on{background:var(--brand);color:#fff}
.content{padding:22px;overflow:auto;flex:1}

/* Cards & tables */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:18px}
.card h3{margin:0 0 14px;font-size:15px}
.toolbar{display:flex;gap:10px;align-items:center;margin-bottom:16px;flex-wrap:wrap}
.toolbar .grow{flex:1}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
th{font-size:11.5px;text-transform:uppercase;letter-spacing:.03em;color:var(--muted);background:#fafbfe}
tbody tr:hover{background:#fafcff}
.num{text-align:right;font-variant-numeric:tabular-nums}

/* Stat cards */
.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:18px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.stat .k{font-size:12px;color:var(--muted);font-weight:600}
.stat .v{font-size:26px;font-weight:700;margin-top:6px}
.stat.brand{background:linear-gradient(135deg,#1857c4,#0f3d8f);color:#fff;border:0}
.stat.brand .k{color:#cfe0ff}
.stat.green .v{color:var(--accent)} .stat.warn .v{color:var(--warn)} .stat.red .v{color:var(--danger)}

/* Buttons */
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);padding:8px 14px;border-radius:8px;font-size:13px;font-weight:600}
.btn:hover{background:#f3f6fc}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-d)}
.btn.green{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn.sm{padding:5px 10px;font-size:12px}
.btn-icon{background:none;border:0;color:var(--muted);padding:4px 6px;font-size:14px}

/* Chips / badges */
.badge{display:inline-block;padding:3px 9px;border-radius:20px;font-size:11.5px;font-weight:700}
.b-gray{background:#eef1f6;color:#5b6781}
.b-blue{background:#e4eeff;color:#1857c4}
.b-green{background:#e0f5ec;color:#0c8a59}
.b-amber{background:#fdf0d9;color:#b9760c}
.b-red{background:#fde6e4;color:#c2362f}
.b-purple{background:#efe6fb;color:#7b3fd0}

/* Modal */
.modal-bg{position:fixed;inset:0;background:rgba(15,25,50,.45);display:flex;align-items:flex-start;justify-content:center;padding:32px 16px;z-index:50;overflow:auto}
.modal{background:#fff;border-radius:14px;width:100%;max-width:880px;box-shadow:0 30px 80px rgba(0,0,0,.3)}
.modal.sm{max-width:480px}
.modal-h{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}
.modal-h h3{margin:0;font-size:16px}
.modal-b{padding:20px;max-height:70vh;overflow:auto}
.modal-f{padding:14px 20px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:10px}
.close-x{background:none;border:0;font-size:20px;color:var(--muted);line-height:1}

/* Line items editor */
.items-tbl input,.items-tbl select{padding:6px 8px}
.items-tbl td{padding:5px 6px}
.totals{margin-top:14px;margin-left:auto;width:280px}
.totals .ln{display:flex;justify-content:space-between;padding:5px 0;font-size:13px}
.totals .ln.grand{border-top:2px solid var(--ink);margin-top:6px;padding-top:8px;font-size:16px;font-weight:700}

.empty{text-align:center;color:var(--muted);padding:40px 0}
.muted{color:var(--muted)}
.tag-dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px}

/* Print document */
.doc{font-family:"Sarabun","Segoe UI",sans-serif;color:#000;background:#fff;padding:30px;max-width:780px;margin:0 auto}
.doc h1{font-size:20px;margin:0}
.doc .co{font-size:12px;color:#333;line-height:1.5}
.doc .dh{display:flex;justify-content:space-between;border-bottom:2px solid #000;padding-bottom:10px;margin-bottom:14px}
.doc .meta{font-size:12px;line-height:1.7}
.doc table{font-size:12px}
.doc table th{background:#f0f0f0;color:#000;border:1px solid #999}
.doc table td{border:1px solid #ccc}
.receipt{font-family:"Sarabun",monospace;width:300px;margin:0 auto;font-size:12px;color:#000}
.receipt .c{text-align:center}
.receipt table{font-size:12px}
.receipt td{border:0;padding:2px 0}
.dashed{border-top:1px dashed #000;margin:6px 0}

@media print{
  .sidebar,.topbar,.toolbar,.no-print,.modal-h,.modal-f{display:none !important}
  body,.app{background:#fff;display:block}
  .modal-bg{position:static;background:#fff;padding:0}
  .modal{box-shadow:none;max-width:100%}
  .modal-b{max-height:none;overflow:visible;padding:0}
  .content{padding:0}
}
@media(max-width:820px){
  .app{grid-template-columns:1fr}
  .sidebar{position:fixed;left:-240px;transition:.2s;z-index:60}
  .sidebar.open{left:0}
}

/* minimal filter bar */
.filterbar{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:12px;color:var(--muted);padding:6px 0 10px;margin-bottom:12px;border-bottom:1px solid var(--line)}
.filterbar .seg{display:inline-flex;border:1px solid var(--line);border-radius:7px;overflow:hidden}
.filterbar .seg button{border:0;border-right:1px solid var(--line);background:#fff;padding:4px 11px;font-size:12px;color:var(--muted);cursor:pointer}
.filterbar .seg button:last-child{border-right:0}
.filterbar .seg button:hover{background:#f3f6fc}
.filterbar .seg button.on{background:var(--brand);color:#fff;font-weight:600}
.filterbar input[type=date],.filterbar select{width:auto;padding:4px 7px;height:30px;font-size:12px;color:var(--ink)}
.filterbar .btn.sm{padding:4px 10px}
.filterbar .sep{width:1px;height:18px;background:var(--line);margin:0 3px}
.filterbar .cnt{margin-left:auto;font-size:12px;color:var(--muted)}

/* ===== Mobile / tablet support ===== */
.hamburger{display:none;background:none;border:0;font-size:22px;line-height:1;cursor:pointer;color:var(--ink);padding:2px 8px;border-radius:8px}
.hamburger:hover{background:#eef3ff}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(15,25,50,.45);z-index:55}
.sidebar-overlay.show{display:block}

@media(max-width:820px){
  .hamburger{display:block}
  .app{grid-template-columns:1fr}
  .sidebar{position:fixed;top:0;left:-260px;width:240px;height:100vh;transition:left .22s ease;z-index:60;box-shadow:2px 0 18px rgba(0,0,0,.35)}
  .sidebar.open{left:0}
  .topbar{position:sticky;top:0;padding:10px 14px}
  .topbar h2{font-size:15px;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .topbar .right{gap:8px}
  .userchip{display:none}
  .content{padding:14px 12px}
  /* tables: keep columns intact and scroll horizontally inside the card */
  .card{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .content > table, .card > table{white-space:nowrap}
  table th,table td{white-space:nowrap}
  .stats{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}
  .stat .v{font-size:22px}
  /* modals fill more of the screen */
  .modal-bg{padding:8px}
  .modal-b{padding:14px}
  .modal-h{padding:12px 14px}
  .modal-f{padding:10px 14px}
  /* bigger touch targets */
  .btn{padding:9px 14px}
  .btn.sm{padding:7px 11px}
  input,select,textarea{font-size:16px}   /* >=16px stops iOS auto-zoom */
  .filterbar{font-size:13px}
}
@media(max-width:480px){
  .topbar .langtoggle{display:none}
  .stats{grid-template-columns:1fr 1fr}
  .modal-f{flex-wrap:wrap}
}

/* ===== resizable table columns ===== */
.resizable th{position:relative}
.resizable th,.resizable td{overflow:hidden;text-overflow:ellipsis}
.col-resizer{position:absolute;top:0;right:0;width:7px;height:100%;cursor:col-resize;user-select:none;touch-action:none}
.col-resizer:hover{background:var(--brand);opacity:.35}

.btn:disabled{opacity:.45;cursor:not-allowed}

/* search suggestions dropdown */
.suggest-box{position:absolute;top:100%;left:0;right:0;background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 8px 8px;box-shadow:0 8px 20px rgba(20,40,80,.14);z-index:30;max-height:440px;overflow:auto}
.suggest-item{padding:9px 12px;cursor:pointer;border-bottom:1px solid var(--line);font-size:13px;display:flex;align-items:center;gap:8px}
.suggest-item:last-child{border-bottom:0}
.suggest-item:hover,.suggest-item.active{background:var(--chip)}

/* drag-to-reorder handle */
.drag-handle{cursor:grab;color:#b4b9c4;user-select:none;text-align:center;font-size:17px;line-height:1}
.drag-handle:hover{color:var(--brand)}
.drag-handle:active{cursor:grabbing}