*{margin:0;padding:0;box-sizing:border-box}
:root{
  --blue:#1860cc;--blue-light:#e8f0fc;
  --green:#1a7a4a;--green-light:#e6f4ed;
  --red:#b91c1c;--red-light:#fef2f2;
  --amber:#b45309;--amber-light:#fffbeb;
  --bg:#f4f6f9;--sidebar:#1e2740;--sidebar-hover:#2d3a57;
  --white:#fff;--border:#dde1e9;--text:#1a1d2e;--muted:#6b7280;
  --nav-h:54px;--sidebar-w:220px;--radius:6px;
}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);font-size:14px}
a{text-decoration:none;color:inherit}

/* TOPBAR */
.topbar{position:fixed;top:0;left:0;right:0;height:var(--nav-h);background:var(--white);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:16px;z-index:200}
.topbar-brand{display:flex;align-items:center;gap:8px;width:var(--sidebar-w);font-weight:600;font-size:16px;color:var(--blue)}
.topbar-brand .logo{width:32px;height:32px;background:var(--blue);border-radius:6px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:15px}
.topbar-company{flex:1}
.topbar-company select{border:1px solid var(--border);border-radius:var(--radius);padding:6px 10px;font-size:13px;background:var(--white);cursor:pointer;outline:none}
.topbar-right{display:flex;align-items:center;gap:8px}
.period-badge{background:var(--blue-light);color:var(--blue);padding:5px 10px;border-radius:var(--radius);font-size:12px;font-weight:500}
.icon-btn{width:34px;height:34px;border:1px solid var(--border);border-radius:var(--radius);background:var(--white);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--muted)}
.icon-btn:hover{background:var(--bg)}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;font-weight:600;font-size:13px;display:flex;align-items:center;justify-content:center}

/* SIDEBAR */
.sidebar{position:fixed;top:var(--nav-h);left:0;bottom:0;width:var(--sidebar-w);background:var(--sidebar);overflow-y:auto;z-index:100;display:flex;flex-direction:column}
.nav-section{padding:16px 12px 4px;font-size:10px;font-weight:600;color:#6b7a9e;letter-spacing:.8px;text-transform:uppercase}
.nav-item{display:flex;align-items:center;gap:10px;padding:8px 14px;margin:1px 8px;border-radius:var(--radius);cursor:pointer;color:#a8b4cc;font-size:13px;transition:background .15s,color .15s}
.nav-item:hover{background:var(--sidebar-hover);color:#fff}
.nav-item.active{background:var(--blue);color:#fff}
.nav-item i{font-size:18px;flex-shrink:0}
.sidebar-bottom{padding:12px;margin-top:auto}

/* MAIN */
.main{margin-top:var(--nav-h);margin-left:var(--sidebar-w);padding:24px;min-height:calc(100vh - var(--nav-h))}

/* FLASH */
.flash{padding:12px 16px;border-radius:var(--radius);margin-bottom:20px;display:flex;align-items:center;gap:8px;font-size:13px}
.flash-success{background:var(--green-light);color:var(--green);border:1px solid #86efac}
.flash-error{background:var(--red-light);color:var(--red);border:1px solid #fca5a5}

/* PAGE HEADER */
.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.page-header h1{font-size:18px;font-weight:600}
.page-header .actions{display:flex;gap:8px}

/* BUTTONS */
.btn{padding:7px 14px;border-radius:var(--radius);font-size:13px;font-weight:500;cursor:pointer;border:none;display:inline-flex;align-items:center;gap:6px;transition:background .15s;font-family:'Inter',sans-serif}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:#154fa8}
.btn-secondary{background:var(--white);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--bg)}
.btn-danger{background:var(--red-light);color:var(--red);border:1px solid #fca5a5}
.btn-sm{padding:5px 10px;font-size:12px}

/* STATS */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}
.stats-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.stat-card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:16px 20px}
.stat-card .label{font-size:12px;color:var(--muted);margin-bottom:6px}
.stat-card .value{font-size:22px;font-weight:600}
.stat-card .sub{font-size:11px;color:var(--muted);margin-top:4px}
.stat-card.green .value{color:var(--green)}
.stat-card.red .value{color:var(--red)}
.stat-card.blue .value{color:var(--blue)}
.stat-card.amber .value{color:var(--amber)}

/* TABLE */
.table-card{background:var(--white);border:1px solid var(--border);border-radius:8px;overflow:hidden;margin-bottom:20px}
.table-toolbar{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--border);flex-wrap:wrap}
.search-box{position:relative}
.search-box input{padding:6px 10px 6px 30px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;outline:none;background:var(--bg);width:240px}
.search-box input:focus{border-color:var(--blue);background:var(--white)}
.search-box i{position:absolute;left:8px;top:50%;transform:translateY(-50%);color:var(--muted)}
.table-toolbar select{padding:6px 10px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;background:var(--white);cursor:pointer;outline:none}
table{width:100%;border-collapse:collapse}
thead tr{background:var(--bg)}
th{padding:10px 14px;text-align:left;font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.4px;border-bottom:1px solid var(--border)}
td{padding:11px 14px;border-bottom:1px solid var(--border);font-size:13px;vertical-align:middle}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:#fafbfc}
.text-right{text-align:right}
.text-mono{font-family:'Courier New',monospace}
.action-cell{display:flex;gap:4px;justify-content:flex-end}
.row-btn{width:28px;height:28px;border-radius:4px;border:1px solid var(--border);background:var(--white);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:14px;text-decoration:none}
.row-btn:hover{background:var(--bg)}
.row-btn.del:hover{background:var(--red-light);color:var(--red);border-color:#fca5a5}

/* BADGES */
.badge{display:inline-flex;align-items:center;padding:3px 8px;border-radius:10px;font-size:11px;font-weight:500}
.badge-green{background:var(--green-light);color:var(--green)}
.badge-red{background:var(--red-light);color:var(--red)}
.badge-amber{background:var(--amber-light);color:var(--amber)}
.badge-blue{background:var(--blue-light);color:var(--blue)}
.badge-gray{background:#f3f4f6;color:#4b5563}

/* FORMS */
.form-card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:24px;margin-bottom:20px}
.form-card h2{font-size:15px;font-weight:600;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.form-row.cols-3{grid-template-columns:1fr 1fr 1fr}
.form-row.full{grid-template-columns:1fr}
.form-group{display:flex;flex-direction:column;gap:5px}
.form-group label{font-size:12px;font-weight:500;color:var(--muted)}
.form-group input,.form-group select,.form-group textarea{padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;outline:none;font-family:'Inter',sans-serif;width:100%}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--blue)}
.form-group textarea{resize:vertical;min-height:80px}
.form-divider{height:1px;background:var(--border);margin:20px 0}
.form-footer{display:flex;gap:10px;justify-content:flex-end;padding-top:16px;border-top:1px solid var(--border)}

/* BTW */
.btw-layout{display:grid;grid-template-columns:1fr 360px;gap:20px;align-items:start}
.btw-box{background:var(--white);border:1px solid var(--border);border-radius:8px;overflow:hidden;margin-bottom:16px}
.btw-box h2{font-size:14px;font-weight:600;padding:14px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px}
.btw-section-hdr{background:var(--bg);padding:8px 18px;font-size:11px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border)}
.btw-row{display:flex;align-items:center;padding:11px 18px;border-bottom:1px solid var(--border);gap:12px}
.btw-row:last-child{border-bottom:none}
.btw-veld{font-size:12px;font-weight:600;width:28px;height:28px;background:var(--blue-light);color:var(--blue);border-radius:4px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.btw-omschr{flex:1;font-size:13px}
.btw-input{width:130px;padding:6px 10px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;text-align:right;outline:none;font-family:'Courier New',monospace}
.btw-input:focus{border-color:var(--blue)}
.btw-bedrag{font-size:14px;font-weight:600;min-width:120px;text-align:right;font-family:'Courier New',monospace}
.btw-summary{background:var(--white);border:1px solid var(--border);border-radius:8px;overflow:hidden;position:sticky;top:70px}
.btw-summary h2{font-size:14px;font-weight:600;padding:14px 18px;border-bottom:1px solid var(--border)}
.saldo-block{padding:20px;text-align:center;border-bottom:1px solid var(--border)}
.saldo-label{font-size:12px;color:var(--muted);margin-bottom:6px}
.saldo-value{font-size:28px;font-weight:700}
.saldo-value.betalen{color:var(--red)}
.saldo-value.ontvangen{color:var(--green)}
.btw-mini-row{display:flex;justify-content:space-between;padding:10px 18px;font-size:13px;border-bottom:1px solid var(--border)}
.btw-submit{padding:16px 18px;display:flex;flex-direction:column;gap:8px}

/* LOGIN */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--sidebar)}
.login-box{background:var(--white);border-radius:12px;padding:40px;width:380px;box-shadow:0 10px 40px rgba(0,0,0,.2)}
.login-box .logo-row{display:flex;align-items:center;gap:10px;margin-bottom:28px}
.login-box .logo-icon{width:40px;height:40px;background:var(--blue);border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:20px}
.login-box h1{font-size:20px;font-weight:700}
.login-box .sub{font-size:13px;color:var(--muted);margin-bottom:24px}

/* INLINE TABLE (factuurregels) */
.regels-table{width:100%;border-collapse:collapse;margin-bottom:10px}
.regels-table th{padding:6px 8px;font-size:11px;font-weight:600;color:var(--muted);text-align:left;border-bottom:1px solid var(--border)}
.regels-table td{padding:5px 4px}
.regels-table input,.regels-table select{width:100%;padding:5px 8px;border:1px solid var(--border);border-radius:4px;font-size:13px;font-family:'Inter',sans-serif}
.totaal-blok{text-align:right;font-size:13px;line-height:2}
.totaal-blok .grand{font-size:16px;font-weight:700}

/* ALERT */
.alert{padding:14px 18px;border-radius:var(--radius);margin-bottom:20px;display:flex;align-items:center;gap:10px;font-size:13px}
.alert-warning{background:var(--amber-light);color:var(--amber);border:1px solid #fcd34d}
.alert-info{background:var(--blue-light);color:var(--blue);border:1px solid #93c5fd}

/* WORKSPACE UI */
.workspace-tabs{display:flex;align-items:center;gap:4px;border-bottom:1px solid var(--border);margin:-4px 0 18px}
.workspace-tabs a{display:inline-flex;align-items:center;gap:7px;padding:10px 12px;border-bottom:2px solid transparent;color:var(--muted);font-size:13px;font-weight:500}
.workspace-tabs a:hover{color:var(--text);background:#eef2f7}
.workspace-tabs a.active{color:var(--blue);border-bottom-color:var(--blue);background:#fff}
.filter-bar{display:flex;align-items:end;gap:10px;flex-wrap:wrap;background:#fff;border:1px solid var(--border);border-radius:8px;padding:12px 14px;margin-bottom:16px}
.filter-bar .form-group{min-width:150px}
.filter-bar .form-group.wide{min-width:260px;flex:1}
.split-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:16px;align-items:start}
.side-panel{background:#fff;border:1px solid var(--border);border-radius:8px;overflow:hidden;position:sticky;top:70px}
.side-panel-header{padding:14px 16px;border-bottom:1px solid var(--border)}
.side-panel-header h2{font-size:15px;font-weight:600;margin-bottom:4px}
.side-panel-header p{font-size:12px;color:var(--muted)}
.detail-list{display:grid;gap:1px;background:var(--border)}
.detail-row{display:flex;justify-content:space-between;gap:12px;background:#fff;padding:10px 14px;font-size:13px}
.detail-row span:first-child{color:var(--muted)}
.detail-row strong{text-align:right}
.mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;padding:14px}
.mini-card{border:1px solid var(--border);border-radius:6px;padding:12px;background:#fafbfc}
.mini-card .label{font-size:11px;color:var(--muted);margin-bottom:5px}
.mini-card .value{font-size:17px;font-weight:700}
.muted{color:var(--muted)}
.text-green{color:var(--green)}
.text-red{color:var(--red)}
.nowrap{white-space:nowrap}
.link-blue{color:var(--blue);font-weight:500}
.empty-state{padding:34px;text-align:center;color:var(--muted)}
.table-card.compact td{padding:8px 12px}
.table-card.compact th{padding:8px 12px}
.pill-tabs{display:inline-flex;border:1px solid var(--border);border-radius:6px;overflow:hidden;background:#fff}
.pill-tabs a{padding:7px 11px;font-size:12px;color:var(--muted);border-right:1px solid var(--border)}
.pill-tabs a:last-child{border-right:none}
.pill-tabs a.active{background:var(--blue);color:#fff}

@media(max-width:900px){
  .sidebar{width:52px}.main{margin-left:52px}
  .nav-item span,.nav-section,.topbar-brand span{display:none}
  .nav-item{padding:10px 0;justify-content:center;gap:0}
  .topbar-brand{width:52px}
  .stats-grid{grid-template-columns:1fr 1fr}
  .btw-layout{grid-template-columns:1fr}
  .split-layout{grid-template-columns:1fr}
  .side-panel{position:static}
}