:root {
  --bg: #f4f6f9; --card: #fff; --text: #1d2433; --muted: #6b7385; --line: #e3e7ee;
  --primary: #1f6feb; --primary-ink: #fff; --ok: #1a7f37; --ok-bg: #e6f4ea;
  --bad: #c62828; --bad-bg: #fdecea; --info: #0b5cad; --info-bg: #e7f0fb; --muted-bg: #eef0f3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420; --card: #171d2b; --text: #e6e9f0; --muted: #98a0b3; --line: #2a3244;
    --primary: #4a8cff; --ok: #56c271; --ok-bg: #16301f; --bad: #ff6b6b; --bad-bg: #3a1a1a;
    --info: #7db3ff; --info-bg: #15263f; --muted-bg: #232a3a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Segoe UI", Tahoma, "Noto Sans Arabic", Arial, sans-serif; font-size: 15px; line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }
header.top {
  background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 16px; padding: 10px 20px; flex-wrap: wrap;
}
header.top .brand { font-weight: 700; font-size: 17px; color: var(--text); white-space: nowrap; }
header.top nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; align-items: center; order: 1; }
header.top nav a { padding: 6px 12px; border-radius: 8px; color: var(--text); white-space: nowrap; }
header.top nav a.on, header.top nav a:hover { background: var(--muted-bg); }
header.top nav .logout { margin-inline-start: auto; }
header.top .conn { order: 2; font-size: 13px; }
header.top .menu-btn { display: none; }
.badge .dot { display: none; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
main { max-width: 1200px; margin: 0 auto; padding: 20px 16px 60px; }
h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 17px; margin: 0 0 12px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin-bottom: 16px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.stat .v { font-size: 22px; font-weight: 700; }
.stat .l { color: var(--muted); font-size: 13px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 9px 8px; border-bottom: 1px solid var(--line); text-align: start; white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
td.num { font-variant-numeric: tabular-nums; }
.mono { font-family: Consolas, "Courier New", monospace; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.bad { background: var(--bad-bg); color: var(--bad); }
.badge.info { background: var(--info-bg); color: var(--info); }
.badge.muted { background: var(--muted-bg); color: var(--muted); }
.bar { height: 6px; background: var(--muted-bg); border-radius: 3px; min-width: 90px; overflow: hidden; margin-top: 4px; }
.bar > i { display: block; height: 100%; background: var(--primary); }
.bar > i.full { background: var(--bad); }
form.inline { display: inline; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
input, select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--text); font: inherit;
}
input[type=checkbox] { width: auto; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.row { display: flex; gap: 8px; align-items: end; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 120px; }
.row > .shrink { flex: 0 0 auto; min-width: 0; }
.btn {
  display: inline-block; border: 1px solid var(--line); background: var(--card); color: var(--text);
  padding: 8px 14px; border-radius: 8px; cursor: pointer; font: inherit; font-size: 14px; white-space: nowrap;
}
.btn:hover { background: var(--muted-bg); }
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.btn.danger { color: var(--bad); }
.btn.sm { padding: 4px 10px; font-size: 13px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; }
.flash.ok { background: var(--ok-bg); color: var(--ok); }
.flash.bad { background: var(--bad-bg); color: var(--bad); }
.hint { color: var(--muted); font-size: 13px; margin-top: 4px; }
.conn { font-size: 13px; }

/* login + portal */
.center { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.box { width: 100%; max-width: 380px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px 24px; }
.box h1 { text-align: center; }
.box .field { margin-bottom: 14px; }
.box .btn { width: 100%; padding: 11px; font-size: 16px; }
.wifi-icon { width: 56px; height: 56px; margin: 0 auto 10px; display: block; color: var(--primary); }
.kv { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); }
.kv:last-child { border-bottom: 0; }

.count { display: inline-block; min-width: 20px; padding: 0 6px; margin-inline-start: 4px; border-radius: 999px;
         background: var(--bad); color: #fff; font-size: 12px; font-weight: 700; text-align: center; line-height: 20px; }
.flash.info-note { background: var(--info-bg); color: var(--info); }
textarea { resize: vertical; min-height: 70px; }

/* self-service balance page */
.balance .bal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; color: var(--muted); }
.balance .bal-head b { color: var(--text); font-size: 17px; }
.ring { --p: 0; --c: var(--primary); width: 190px; height: 190px; margin: 0 auto 18px; border-radius: 50%;
        background: conic-gradient(var(--c) calc(var(--p) * 1%), var(--muted-bg) 0); display: grid; place-items: center; }
.ring.ok { --c: var(--ok); } .ring.warn { --c: #e8a317; } .ring.bad { --c: var(--bad); }
.ring-in { width: 150px; height: 150px; border-radius: 50%; background: var(--card); display: grid; place-content: center; text-align: center; }
.ring-in .big { font-size: 24px; font-weight: 700; direction: ltr; }
.ring-in .small { color: var(--muted); font-size: 13px; }
.flash.warn { background: #fff4d6; color: #8a5a00; }
@media (prefers-color-scheme: dark) { .flash.warn { background: #3a2e10; color: #f0c060; } }

/* printable cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.vcard { border: 1.5px dashed #888; border-radius: 10px; padding: 12px 14px; background: #fff; color: #111; break-inside: avoid; }
.vcard .t { font-weight: 700; text-align: center; margin-bottom: 8px; font-size: 16px; }
.vcard .kv { border-color: #ddd; padding: 3px 0; font-size: 14px; }
.vcard .kv b { font-family: Consolas, "Courier New", monospace; font-size: 16px; direction: ltr; unicode-bidi: isolate; }
.mono { direction: ltr; unicode-bidi: isolate; }
.vcard .howto { margin-top: 6px; padding-top: 6px; border-top: 1px solid #ddd; font-size: 11px; color: #555; line-height: 1.6; }
.share-row { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.share-row .btn { flex: 1; }
.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, .6); display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 50; }
.modal[hidden] { display: none; }
.modal-box { background: var(--card); border-radius: 14px; padding: 16px; max-width: 460px; width: 100%; text-align: center; }
.modal-box img { width: 100%; border-radius: 10px; display: block; }
.list-tools { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.pick-all { display: flex; gap: 6px; align-items: center; margin: 0; color: var(--text); font-size: 14px; cursor: pointer; }
.users-table td.head .note { display: block; }
.show-sm { display: none; }
.add-gb { display: flex; gap: 6px; align-items: stretch; }
.add-gb input { width: 80px; }

/* ---------------------------------------------------------------- responsive */
/* Tablets and phones: the menu folds into a ☰ button. */
@media (max-width: 900px) {
  header.top { padding: 8px 12px; gap: 8px; }
  header.top .brand { flex: 1; font-size: 16px; }
  header.top .conn { order: 0; }
  header.top .conn .lbl { display: none; }
  header.top .conn .badge { padding: 6px; }
  .badge .dot { display: block; }
  header.top .menu-btn {
    display: inline-flex; align-items: center; gap: 2px; font-size: 20px; line-height: 1; cursor: pointer;
    background: none; border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; color: var(--text);
  }
  header.top nav {
    display: none; order: 3; flex-basis: 100%; flex-direction: column; align-items: stretch; gap: 2px;
    padding-top: 6px; border-top: 1px solid var(--line);
  }
  header.top.open nav { display: flex; }
  header.top nav a { padding: 11px 12px; font-size: 16px; }
  header.top nav .logout { margin: 6px 0 4px; }
  header.top nav .logout .btn { width: 100%; padding: 10px; }
}

/* Tables become one card per row. */
@media (max-width: 820px) {
  .rtable thead { display: none; }
  .rtable, .rtable tr, .rtable td { display: block; width: 100%; }
  /* one card per row on phones, two or more side by side on tablets */
  .rtable tbody { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 10px; }
  .rtable tr { border: 1px solid var(--line); border-radius: 12px; padding: 8px 14px; background: var(--card); }
  .rtable td {
    border: 0; padding: 6px 0; display: flex; justify-content: space-between; align-items: center; gap: 12px;
    white-space: normal; text-align: end;
  }
  .rtable td[data-label]::before { content: attr(data-label); color: var(--muted); font-size: 13px; text-align: start; flex-shrink: 0; }
  .rtable td.head { font-size: 16px; border-bottom: 1px solid var(--line); padding-bottom: 10px; margin-bottom: 4px; }
  .rtable td.wide { display: block; text-align: start; }
  .rtable td.wide .bar { width: 100%; }
  .rtable td:empty, .rtable td.hide-sm { display: none; }
  .rtable td .btn { flex: 1; text-align: center; }
  .card.table-card { background: none; border: 0; padding: 0; }
  .rtable tr { position: relative; }
  .rtable td.pick-cell { position: absolute; top: 12px; left: 14px; width: auto; padding: 0; }
  .rtable td.head { padding-left: 34px; }
  .rtable .show-sm { display: inline-block; }
  .rtable td.head .note { font-size: 13px; }
  .rtable td.wide .usage { display: flex; justify-content: space-between; }
  .rtable td.wide .usage::before { content: "الاستهلاك"; color: var(--muted); font-size: 13px; }
  .rtable td.wide::before { display: none; }
}

/* Phones. */
@media (max-width: 600px) {
  main { padding: 14px 12px 50px; }
  h1 { font-size: 19px; }
  .card { padding: 14px; border-radius: 12px; }
  .stats { grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); gap: 8px; }
  .stat { padding: 10px 12px; }
  .stat .v { font-size: 17px; white-space: nowrap; }
  .stats.four { grid-template-columns: 1fr 1fr; }
  .stat .l { font-size: 12px; }
  .grid { grid-template-columns: 1fr; gap: 12px; }
  .row > * { min-width: 100%; }
  .row > .shrink { min-width: 0; }
  .row.unit-row { flex-wrap: nowrap; }
  .row.unit-row > * { min-width: 0; }
  .actions .btn, .actions form.inline .btn { padding: 10px 14px; }
  /* quick actions: a tidy two-column grid of equal buttons */
  .actions.quick { display: grid; grid-template-columns: 1fr 1fr; }
  .actions.quick > *, .actions.quick .btn { width: 100%; text-align: center; }
  .actions.quick > form.inline { display: block; }
  .actions.quick .add-gb { grid-column: 1 / -1; }
  .actions.quick .add-gb input { flex: 1; width: auto; }
  .actions.quick .add-gb .btn { width: auto; }
  input, select, textarea { font-size: 16px; }  /* stops iPhone from zooming into fields */
  .box { padding: 22px 16px; }
  .ring { width: 170px; height: 170px; }
  .ring-in { width: 134px; height: 134px; }
  .cards { grid-template-columns: 1fr; }
  .modal { padding: 10px; }
}

@media print {
  header.top, .no-print, .flash { display: none !important; }
  body { background: #fff; }
  main { padding: 0; max-width: none; }
  .cards { grid-template-columns: repeat(3, 1fr); }
}