/* SmartBill360 design system. Self-contained - no CDN dependency,
   so the UI still works if an external stylesheet fails to load. */
:root{
  --bg:#f4f6fb; --surface:#fff; --surface-2:#f8fafc; --border:#e3e8f0;
  --text:#0f172a; --muted:#64748b; --brand:#2f5bea; --brand-soft:#eaf0ff;
  --accent:#7c3aed; --ok:#0f9d58; --ok-soft:#e6f6ee; --warn:#c2761a;
  --warn-soft:#fdf3e3; --danger:#d64545; --danger-soft:#fdeaea;
  --radius:14px; --radius-sm:9px; --shadow:0 1px 2px rgba(15,23,42,.05),0 8px 24px rgba(15,23,42,.06);
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
}
[data-theme="dark"]{
  --bg:#0d1117; --surface:#161b22; --surface-2:#1c2230; --border:#2a3140;
  --text:#e6edf3; --muted:#8b949e; --brand-soft:#1b2440; --ok-soft:#12261b;
  --warn-soft:#2a2014; --danger-soft:#2c1618;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:14px;line-height:1.5;
  -webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
h1,h2,h3,h4{margin:0 0 .5rem;font-weight:650;letter-spacing:-.01em}

/* ---------- shell ---------- */
.sidebar{position:fixed;inset:0 auto 0 0;width:236px;background:var(--surface);
  border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:40}
.brand{display:flex;gap:10px;align-items:center;padding:18px 16px;border-bottom:1px solid var(--border)}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--accent));
  color:#fff;display:grid;place-items:center;font-weight:700;font-size:13px;letter-spacing:.5px}
.brand-mark.lg{width:52px;height:52px;font-size:18px;margin:0 auto 12px}
.brand-text strong{display:block;font-size:14px}
.brand-text small{color:var(--muted);font-size:11px;display:block;max-width:150px;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap}
.nav{flex:1;overflow-y:auto;padding:10px 8px}
.nav-label{font-size:10.5px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);
  padding:14px 10px 6px;font-weight:600}
.nav-item{display:flex;gap:10px;align-items:center;padding:9px 11px;border-radius:var(--radius-sm);
  color:var(--text);font-weight:500;font-size:13.5px}
.nav-item:hover{background:var(--surface-2)}
.nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.nav-item .ico{width:18px;text-align:center;opacity:.8}
.sidebar-foot{padding:10px 8px;border-top:1px solid var(--border)}
.shell{margin-left:236px;min-height:100vh;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:14px;padding:12px 22px;
  background:rgba(255,255,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
[data-theme="dark"] .topbar{background:rgba(22,27,34,.85)}
.page-title{font-size:16px;margin:0;flex:1}
.topbar-right{display:flex;align-items:center;gap:10px}
.user-chip{font-size:12.5px;color:var(--muted);padding:5px 11px;background:var(--surface-2);border-radius:99px}
.icon-btn{display:none;background:none;border:0;font-size:19px;cursor:pointer;color:var(--text)}
.content{padding:22px;flex:1;max-width:1400px;width:100%}
.centered{display:grid;place-items:center;min-height:100vh;padding:20px}

/* ---------- cards ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px;margin-bottom:18px}
.card-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.card-head h2{font-size:14.5px;margin:0}
.kpi-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:18px}
.kpi{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;
  box-shadow:var(--shadow);position:relative;overflow:hidden}
.kpi::after{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--brand);opacity:.75}
.kpi.ok::after{background:var(--ok)} .kpi.warn::after{background:var(--warn)}
.kpi.danger::after{background:var(--danger)} .kpi.accent::after{background:var(--accent)}
.kpi .label{font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-weight:600}
.kpi .value{font-size:23px;font-weight:680;margin-top:6px;letter-spacing:-.02em}
.kpi .sub{font-size:12px;color:var(--muted);margin-top:3px}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.data{width:100%;border-collapse:collapse;font-size:13.5px}
table.data th{text-align:left;font-size:11px;text-transform:uppercase;letter-spacing:.06em;
  color:var(--muted);font-weight:650;padding:10px 12px;border-bottom:1px solid var(--border);white-space:nowrap}
table.data td{padding:11px 12px;border-bottom:1px solid var(--border);vertical-align:middle}
table.data tbody tr:hover{background:var(--surface-2)}
table.data tr:last-child td{border-bottom:0}
.num{text-align:right;font-variant-numeric:tabular-nums;font-family:var(--mono);font-size:13px}
.empty{padding:40px 16px;text-align:center;color:var(--muted)}

/* ---------- forms ---------- */
.field{display:block;margin-bottom:14px}
.field>span{display:block;font-size:12.5px;font-weight:600;margin-bottom:5px;color:var(--muted)}
input,select,textarea{width:100%;padding:9px 11px;border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--surface);color:var(--text);font-family:inherit;font-size:14px;transition:border-color .12s,box-shadow .12s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
input[readonly]{background:var(--surface-2);color:var(--muted)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:0 16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:0 16px}
.form-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 16px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:600;font-size:13.5px;
  cursor:pointer;font-family:inherit;transition:transform .06s,filter .12s}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn-primary:hover{filter:brightness(1.07)}
.btn-ok{background:var(--ok);border-color:var(--ok);color:#fff}
.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn-ghost{background:transparent}
.btn-sm{padding:6px 11px;font-size:12.5px}
.btn-block{width:100%}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ---------- misc ---------- */
.pill{display:inline-block;padding:3px 10px;border-radius:99px;font-size:11.5px;font-weight:650;
  background:var(--surface-2);color:var(--muted)}
.pill-ok{background:var(--ok-soft);color:var(--ok)}
.pill-warn{background:var(--warn-soft);color:var(--warn)}
.pill-danger{background:var(--danger-soft);color:var(--danger)}
.pill-brand{background:var(--brand-soft);color:var(--brand)}
.alert{padding:11px 14px;border-radius:var(--radius-sm);margin-bottom:14px;font-size:13.5px;font-weight:500}
.alert-success{background:var(--ok-soft);color:var(--ok)}
.alert-error{background:var(--danger-soft);color:var(--danger)}
.alert-info{background:var(--brand-soft);color:var(--brand)}
.alert.floating{position:fixed;top:16px;left:50%;transform:translateX(-50%);z-index:100;box-shadow:var(--shadow)}
.filters{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end;margin-bottom:16px}
.filters .field{margin:0;min-width:150px}
.pager{display:flex;gap:6px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.pager a,.pager span{padding:6px 11px;border-radius:var(--radius-sm);border:1px solid var(--border);font-size:13px}
.pager .on{background:var(--brand);color:#fff;border-color:var(--brand)}

/* ---------- auth ---------- */
.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:32px;
  width:100%;max-width:380px;box-shadow:var(--shadow)}
.auth-brand{text-align:center;margin-bottom:22px}
.auth-brand h1{font-size:21px;margin:0}
.auth-brand p{color:var(--muted);font-size:12.5px;margin:4px 0 0}
.auth-foot{text-align:center;color:var(--muted);font-size:11.5px;margin:18px 0 0}

/* ---------- billing screen ---------- */
.bill-layout{display:grid;grid-template-columns:1fr 320px;gap:18px;align-items:start}
.bill-totals{position:sticky;top:76px}
.total-row{display:flex;justify-content:space-between;padding:7px 0;font-size:13.5px}
.total-row.grand{border-top:2px solid var(--border);margin-top:8px;padding-top:12px;
  font-size:19px;font-weight:700}
.total-row .num{font-family:var(--mono)}
table.items input,table.items select{padding:6px 8px;font-size:13px;border-radius:6px}
table.items td{padding:5px 6px}
table.items th{padding:8px 6px}
.row-del{background:none;border:0;color:var(--danger);cursor:pointer;font-size:16px;padding:2px 6px}
.autocomplete{position:relative}
.ac-list{position:absolute;top:calc(100% + 2px);left:0;right:0;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow);
  max-height:260px;overflow-y:auto;z-index:60;display:none}
.ac-list.show{display:block}
.ac-item{padding:8px 11px;cursor:pointer;font-size:13.5px;border-bottom:1px solid var(--border)}
.ac-item:last-child{border-bottom:0}
.ac-item:hover,.ac-item.sel{background:var(--brand-soft)}
.ac-item small{display:block;color:var(--muted);font-size:11.5px}

/* ---------- modal + toast ---------- */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.5);display:none;place-items:center;z-index:90;padding:16px}
.modal.show{display:grid}
.modal-box{background:var(--surface);border-radius:18px;padding:24px;width:100%;max-width:440px;box-shadow:var(--shadow)}
.toast-host{position:fixed;bottom:20px;right:20px;z-index:110;display:flex;flex-direction:column;gap:8px}
.toast{padding:11px 16px;border-radius:var(--radius-sm);background:var(--text);color:var(--surface);
  font-size:13.5px;font-weight:500;box-shadow:var(--shadow);animation:slideIn .2s ease}
.toast.err{background:var(--danger);color:#fff}
.toast.ok{background:var(--ok);color:#fff}
@keyframes slideIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .bill-layout{grid-template-columns:1fr}
  .bill-totals{position:static}
  .grid-4{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .sidebar{transform:translateX(-100%);transition:transform .22s}
  .sidebar.open{transform:none;box-shadow:var(--shadow)}
  .shell{margin-left:0}
  .icon-btn{display:block}
  .content{padding:14px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .kpi-grid{grid-template-columns:1fr 1fr;gap:10px}
  .kpi .value{font-size:19px}
  table.data{font-size:13px}
}

/* ---------- print ---------- */
@media print{
  .sidebar,.topbar,.no-print,.toast-host{display:none!important}
  .shell{margin:0}.content{padding:0;max-width:none}
  body{background:#fff;font-size:12px}
  .card{box-shadow:none;border:0;margin:0;padding:0}
  @page{margin:12mm}
}