/* MHz Billing — interface styles. Plain CSS, light + dark. */
:root{
  --accent:#2f6bff; --accent-ink:#fff;
  --bg:#f5f6f8; --panel:#fff; --panel-2:#fbfcfd; --ink:#111826; --ink-2:#5b6472; --ink-3:#8b94a1;
  --line:#e4e7ec; --line-2:#eef0f3;
  --ok:#0f9d58; --ok-bg:#e8f7ef; --warn:#b7791f; --warn-bg:#fdf5e4; --bad:#d64545; --bad-bg:#fdeceb;
  --info:#2f6bff; --info-bg:#eaf0ff; --mute:#6b7280; --mute-bg:#f0f1f4;
  --radius:10px; --radius-sm:7px; --shadow:0 1px 2px rgba(16,24,40,.05),0 1px 3px rgba(16,24,40,.06);
  --shadow-lg:0 10px 30px rgba(16,24,40,.12); --sidebar:248px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
[data-theme="dark"]{
  --bg:#0f1319; --panel:#161b23; --panel-2:#1b212b; --ink:#e9edf3; --ink-2:#a3adbb; --ink-3:#78828f;
  --line:#262d38; --line-2:#1f252f;
  --ok:#3ecf8e; --ok-bg:#12291f; --warn:#e3b341; --warn-bg:#2b2413; --bad:#f2777a; --bad-bg:#2d1a1b;
  --info:#6f9cff; --info-bg:#161f33; --mute:#9aa3b0; --mute-bg:#1e242e;
  --shadow:0 1px 2px rgba(0,0,0,.4); --shadow-lg:0 12px 34px rgba(0,0,0,.55);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font:14px/1.5 var(--font);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0;font-weight:650;letter-spacing:-.01em}
h1{font-size:21px} h2{font-size:17px} h3{font-size:15px}
small{font-size:12px}
hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.ic{vertical-align:-2px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* ---------------------------------------------------------------- shell */
.app{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar);flex:0 0 var(--sidebar);background:var(--panel);border-right:1px solid var(--line);
  position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:40}
.sidebar .brand{display:flex;align-items:center;gap:10px;padding:16px 18px;border-bottom:1px solid var(--line-2);min-height:60px}
.sidebar .brand img{max-height:30px;max-width:150px}
.sidebar .brand .mark{width:28px;height:28px;border-radius:8px;background:var(--accent);color:#fff;display:grid;
  place-items:center;font-weight:700;font-size:13px;flex:0 0 28px}
.sidebar .brand b{font-size:14.5px;font-weight:650;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav{flex:1;overflow-y:auto;padding:10px 10px 24px}
.nav .group{padding:14px 10px 6px;font-size:10.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--ink-3);font-weight:650}
.nav a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:var(--radius-sm);color:var(--ink-2);
  font-weight:500;margin-bottom:1px;white-space:nowrap}
.nav a:hover{background:var(--panel-2);color:var(--ink);text-decoration:none}
.nav a.on{background:var(--info-bg);color:var(--accent);font-weight:600}
.nav a .ic{flex:0 0 17px;opacity:.9}
.nav a .pill{margin-left:auto;background:var(--bad);color:#fff;border-radius:20px;padding:1px 6px;font-size:10.5px;font-weight:700}
.main{flex:1;margin-left:var(--sidebar);min-width:0;display:flex;flex-direction:column}
.topbar{height:60px;background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;
  gap:12px;padding:0 20px;position:sticky;top:0;z-index:30}
.topbar .search{flex:1;max-width:460px;position:relative}
.topbar .search input{width:100%;padding:8px 12px 8px 34px;border:1px solid var(--line);border-radius:var(--radius-sm);
  background:var(--panel-2);color:var(--ink);font-size:13.5px}
.topbar .search .ic{position:absolute;left:10px;top:9px;color:var(--ink-3)}
.topbar .spacer{flex:1}
.content{padding:22px;max-width:1500px;width:100%}
.page-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.page-head .sub{color:var(--ink-2);font-size:13px;margin-top:3px}
.page-head .actions{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
@media(max-width:900px){
  .sidebar{transform:translateX(-100%);transition:transform .2s}
  body.nav-open .sidebar{transform:none;box-shadow:var(--shadow-lg)}
  .main{margin-left:0}
  .content{padding:14px}
}
.menu-btn{display:none}
@media(max-width:900px){.menu-btn{display:inline-flex}}

/* ---------------------------------------------------------------- controls */
.btn{display:inline-flex;align-items:center;gap:7px;padding:8px 13px;border-radius:var(--radius-sm);border:1px solid var(--line);
  background:var(--panel);color:var(--ink);font:inherit;font-weight:550;font-size:13.5px;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--panel-2);text-decoration:none}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{filter:brightness(.94);background:var(--accent)}
.btn-danger{color:var(--bad);border-color:var(--line)}
.btn-danger:hover{background:var(--bad-bg)}
.btn-ghost{border-color:transparent;background:transparent;color:var(--ink-2)}
.btn-ghost:hover{background:var(--panel-2);color:var(--ink)}
.btn-sm{padding:5px 9px;font-size:12.5px}
.btn-icon{padding:7px;border-radius:var(--radius-sm)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
input,select,textarea{font:inherit;font-size:13.5px;color:var(--ink);background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:8px 10px;width:100%;outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 16%,transparent)}
textarea{min-height:90px;resize:vertical;line-height:1.55}
select{appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b94a1' stroke-width='2.5'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat:no-repeat;background-position:right 10px center;padding-right:28px}
label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-2);margin-bottom:5px}
.field{margin-bottom:14px}
.field .hint{font-size:12px;color:var(--ink-3);margin-top:4px}
.field.error input,.field.error select{border-color:var(--bad)}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,1fr)} .g3{grid-template-columns:repeat(3,1fr)} .g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1000px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:680px){.g2,.g3,.g4{grid-template-columns:1fr}}
.check{display:flex;align-items:center;gap:9px;font-size:13.5px;color:var(--ink);font-weight:500;cursor:pointer}
.check input{width:16px;height:16px;flex:0 0 16px;accent-color:var(--accent)}
.switch{position:relative;width:38px;height:21px;flex:0 0 38px;background:var(--line);border-radius:20px;transition:.15s;cursor:pointer}
.switch:after{content:"";position:absolute;top:2px;left:2px;width:17px;height:17px;border-radius:50%;background:#fff;transition:.15s;box-shadow:0 1px 2px rgba(0,0,0,.25)}
input:checked+.switch{background:var(--accent)}
input:checked+.switch:after{transform:translateX(17px)}
.switch-wrap input{position:absolute;opacity:0;width:0;height:0}
.switch-wrap{display:flex;align-items:center;gap:10px;cursor:pointer;position:relative}

/* ---------------------------------------------------------------- surfaces */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.card+.card{margin-top:16px}
.card .hd{display:flex;align-items:center;gap:10px;padding:13px 16px;border-bottom:1px solid var(--line-2)}
.card .hd h3{font-size:14px}
.card .hd .actions{margin-left:auto;display:flex;gap:6px}
.card .bd{padding:16px}
.card .bd.tight{padding:0}
.card .ft{padding:11px 16px;border-top:1px solid var(--line-2);background:var(--panel-2);
  border-radius:0 0 var(--radius) var(--radius);display:flex;align-items:center;gap:10px}
.empty{padding:38px 20px;text-align:center;color:var(--ink-3)}
.empty .ic{width:30px;height:30px;opacity:.5;margin-bottom:8px}
.empty h3{color:var(--ink-2);font-weight:600;margin-bottom:4px}

/* ---------------------------------------------------------------- stats */
.stats{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(176px,1fr))}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:15px 16px;box-shadow:var(--shadow)}
.stat .lbl{font-size:12px;color:var(--ink-3);font-weight:600;text-transform:uppercase;letter-spacing:.04em;
  display:flex;align-items:center;gap:6px}
.stat .val{font-size:23px;font-weight:680;letter-spacing:-.02em;margin-top:7px;line-height:1.15}
.stat .sub{font-size:12.5px;color:var(--ink-2);margin-top:5px}
.stat .up{color:var(--ok);font-weight:600} .stat .down{color:var(--bad);font-weight:600}
.stat.accent{border-left:3px solid var(--accent)}

/* ---------------------------------------------------------------- tables */
.table-wrap{overflow-x:auto}
table.t{width:100%;border-collapse:collapse;font-size:13.5px}
table.t th{text-align:left;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);
  font-weight:650;padding:10px 14px;border-bottom:1px solid var(--line);white-space:nowrap;background:var(--panel-2)}
table.t th a{color:inherit}
table.t td{padding:11px 14px;border-bottom:1px solid var(--line-2);vertical-align:middle}
table.t tbody tr:hover{background:var(--panel-2)}
table.t tbody tr:last-child td{border-bottom:0}
table.t .num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
table.t .mini{color:var(--ink-3);font-size:12px}
table.t .row-actions{text-align:right;white-space:nowrap;opacity:.35;transition:.12s}
table.t tr:hover .row-actions{opacity:1}
.sort-arrow{color:var(--accent)}
.badge{display:inline-flex;align-items:center;gap:5px;padding:2px 8px;border-radius:20px;font-size:11.5px;font-weight:650;white-space:nowrap}
.badge-ok{background:var(--ok-bg);color:var(--ok)} .badge-warn{background:var(--warn-bg);color:var(--warn)}
.badge-bad{background:var(--bad-bg);color:var(--bad)} .badge-info{background:var(--info-bg);color:var(--info)}
.badge-mute{background:var(--mute-bg);color:var(--mute)}
.avatar{width:30px;height:30px;border-radius:50%;display:inline-grid;place-items:center;color:#fff;font-size:11.5px;
  font-weight:700;flex:0 0 30px}
.who{display:flex;align-items:center;gap:9px;min-width:0}
.who b{font-weight:600;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.who span{color:var(--ink-3);font-size:12px}

/* ---------------------------------------------------------------- filters, pagination */
.filters{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.filters input,.filters select{width:auto;min-width:130px}
.filters .grow{flex:1;min-width:190px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:16px;overflow-x:auto}
.tabs a{padding:9px 13px;color:var(--ink-2);font-weight:600;font-size:13.5px;border-bottom:2px solid transparent;white-space:nowrap}
.tabs a:hover{color:var(--ink);text-decoration:none}
.tabs a.on{color:var(--accent);border-bottom-color:var(--accent)}
.pager{display:flex;align-items:center;gap:6px;margin-left:auto}
.pager a,.pager span{padding:5px 10px;border-radius:var(--radius-sm);border:1px solid var(--line);font-size:13px;color:var(--ink-2)}
.pager .on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}

/* ---------------------------------------------------------------- flash, toast */
.flash{display:flex;align-items:flex-start;gap:10px;padding:11px 14px;border-radius:var(--radius-sm);margin-bottom:14px;
  font-size:13.5px;font-weight:500;border:1px solid transparent}
.flash-success{background:var(--ok-bg);color:var(--ok);border-color:color-mix(in srgb,var(--ok) 25%,transparent)}
.flash-error{background:var(--bad-bg);color:var(--bad);border-color:color-mix(in srgb,var(--bad) 25%,transparent)}
.flash-warning{background:var(--warn-bg);color:var(--warn);border-color:color-mix(in srgb,var(--warn) 25%,transparent)}
.flash-info{background:var(--info-bg);color:var(--info);border-color:color-mix(in srgb,var(--info) 25%,transparent)}
#toasts{position:fixed;right:18px;bottom:18px;z-index:120;display:flex;flex-direction:column;gap:8px}
.toast{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:var(--radius-sm);
  padding:11px 14px;box-shadow:var(--shadow-lg);font-size:13.5px;min-width:230px;animation:slideIn .18s ease}
.toast.err{border-left-color:var(--bad)} .toast.ok{border-left-color:var(--ok)}
@keyframes slideIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------------------------------------------------------------- dropdown, modal */
.dd{position:relative;display:inline-block}
.dd-menu{position:absolute;right:0;top:calc(100% + 5px);background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow-lg);min-width:195px;padding:5px;display:none;z-index:60}
.dd.open .dd-menu{display:block}
.dd-menu a,.dd-menu button{display:flex;align-items:center;gap:9px;width:100%;padding:8px 10px;border-radius:var(--radius-sm);
  color:var(--ink);font-size:13.5px;background:none;border:0;cursor:pointer;text-align:left;font-family:inherit}
.dd-menu a:hover,.dd-menu button:hover{background:var(--panel-2);text-decoration:none}
.dd-menu .danger{color:var(--bad)}
.dd-menu .sep{height:1px;background:var(--line-2);margin:5px 0}
.modal-back{position:fixed;inset:0;background:rgba(16,24,40,.45);display:none;align-items:flex-start;justify-content:center;
  z-index:100;padding:60px 16px;overflow-y:auto}
.modal-back.open{display:flex}
.modal{background:var(--panel);border-radius:12px;box-shadow:var(--shadow-lg);width:100%;max-width:520px;border:1px solid var(--line)}
.modal .hd{padding:15px 18px;border-bottom:1px solid var(--line-2);display:flex;align-items:center}
.modal .hd h3{flex:1} .modal .bd{padding:18px} .modal .ft{padding:13px 18px;border-top:1px solid var(--line-2);
  display:flex;justify-content:flex-end;gap:8px;background:var(--panel-2);border-radius:0 0 12px 12px}

/* ---------------------------------------------------------------- invoice editor */
.editor{display:grid;grid-template-columns:1fr 310px;gap:16px;align-items:start}
@media(max-width:1100px){.editor{grid-template-columns:1fr}}
.items-table{width:100%;border-collapse:collapse}
.items-table th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-3);text-align:left;
  padding:8px 8px;border-bottom:1px solid var(--line)}
.items-table td{padding:5px 6px;border-bottom:1px solid var(--line-2);vertical-align:top}
.items-table input,.items-table select,.items-table textarea{border-color:transparent;background:transparent;padding:7px 8px}
.items-table tr:hover input,.items-table tr:hover select{background:var(--panel-2)}
.items-table input:focus,.items-table select:focus,.items-table textarea:focus{background:var(--panel);border-color:var(--accent)}
.items-table .drag{cursor:grab;color:var(--ink-3);width:22px;text-align:center;padding-top:13px}
.items-table .lt{text-align:right;font-variant-numeric:tabular-nums;padding-top:14px;font-weight:600;white-space:nowrap}
.items-table .rm{color:var(--ink-3);background:none;border:0;cursor:pointer;padding:9px 4px}
.items-table .rm:hover{color:var(--bad)}
.totals{margin-left:auto;width:320px;max-width:100%}
.totals .row{display:flex;justify-content:space-between;padding:6px 0;font-size:13.5px;color:var(--ink-2)}
.totals .row b{color:var(--ink);font-variant-numeric:tabular-nums}
.totals .row.total{border-top:1px solid var(--line);margin-top:6px;padding-top:11px;font-size:16px;font-weight:680;color:var(--ink)}
.side-card{position:sticky;top:76px}
.ac-wrap{position:relative}
.ac-list{position:absolute;left:0;right:0;top:calc(100% + 3px);background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);max-height:260px;overflow-y:auto;z-index:70;display:none}
.ac-list.open{display:block}
.ac-list div{padding:8px 11px;cursor:pointer;font-size:13.5px}
.ac-list div:hover,.ac-list div.sel{background:var(--info-bg);color:var(--accent)}
.ac-list .meta{color:var(--ink-3);font-size:12px}

/* ---------------------------------------------------------------- misc */
.kv{display:grid;grid-template-columns:auto 1fr;gap:7px 16px;font-size:13.5px}
.kv dt{color:var(--ink-3);font-weight:500} .kv dd{margin:0;font-weight:550;text-align:right}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{background:var(--mute-bg);color:var(--ink-2);border-radius:20px;padding:2px 9px;font-size:11.5px;font-weight:600}
.insight{display:flex;gap:12px;padding:13px 16px;border-bottom:1px solid var(--line-2)}
.insight:last-child{border-bottom:0}
.insight .ico{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;flex:0 0 32px;background:var(--info-bg);color:var(--info)}
.insight.high .ico{background:var(--bad-bg);color:var(--bad)}
.insight.medium .ico{background:var(--warn-bg);color:var(--warn)}
.insight .txt{flex:1;min-width:0}
.insight .txt b{display:block;font-weight:620;font-size:13.5px}
.insight .txt p{margin:3px 0 0;color:var(--ink-2);font-size:12.5px;display:-webkit-box;-webkit-line-clamp:2;
  -webkit-box-orient:vertical;overflow:hidden}
.insight .btn{align-self:center;white-space:nowrap}
.insight .val{font-weight:680;white-space:nowrap;font-size:13.5px}
.progress{height:6px;background:var(--mute-bg);border-radius:6px;overflow:hidden}
.progress i{display:block;height:100%;background:var(--accent);border-radius:6px}
.timeline{position:relative;padding-left:20px}
.timeline:before{content:"";position:absolute;left:5px;top:5px;bottom:5px;width:2px;background:var(--line)}
.timeline .ev{position:relative;padding:0 0 15px}
.timeline .ev:before{content:"";position:absolute;left:-19px;top:5px;width:9px;height:9px;border-radius:50%;
  background:var(--panel);border:2px solid var(--accent)}
.timeline .ev small{color:var(--ink-3)}
.doc-view{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.doc-view .brandline{height:4px;background:var(--accent);border-radius:4px;margin-bottom:22px}
.doc-view .rt :is(p,ul,ol){margin:0 0 10px}
.print-only{display:none}
@media print{
  .sidebar,.topbar,.page-head .actions,.no-print{display:none!important}
  .main{margin:0} .content{padding:0;max-width:none}
  .doc-view{border:0;box-shadow:none;padding:0}
  .print-only{display:block}
  body{background:#fff}
}
.text-ok{color:var(--ok)} .text-bad{color:var(--bad)} .text-warn{color:var(--warn)} .text-mute{color:var(--ink-3)}
.mono{font-family:var(--mono);font-size:12.5px}
.nowrap{white-space:nowrap}
.right{text-align:right} .center{text-align:center}
.mt0{margin-top:0}.mt8{margin-top:8px}.mt16{margin-top:16px}.mt24{margin-top:24px}
.mb0{margin-bottom:0}.mb8{margin-bottom:8px}.mb16{margin-bottom:16px}
.flex{display:flex;align-items:center;gap:10px} .wrap{flex-wrap:wrap} .between{justify-content:space-between}
.hidden{display:none!important}
.sep-row td{background:var(--panel-2);font-weight:650;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-3)}

/* ---------------------------------------------------------------- rich text */
.rich-wrap{border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;background:var(--panel)}
.rich-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 16%,transparent)}
.rich-tools{display:flex;gap:2px;padding:5px 6px;border-bottom:1px solid var(--line-2);background:var(--panel-2);flex-wrap:wrap}
.rich-tools button{border:0;background:none;color:var(--ink-2);padding:4px 8px;border-radius:5px;cursor:pointer;
  font:inherit;font-size:12.5px;line-height:1.3}
.rich-tools button:hover{background:var(--line-2);color:var(--ink)}
.rich-tools button.on{background:var(--info-bg);color:var(--accent)}
.rich-tools .sep{width:1px;background:var(--line);margin:3px 4px}
.rich-area{padding:10px 12px;min-height:110px;outline:none;font-size:13.5px;line-height:1.6;overflow-y:auto;max-height:420px}
.rich-area:empty:before{content:attr(data-placeholder);color:var(--ink-3)}
.rich-area p{margin:0 0 8px} .rich-area ul,.rich-area ol{margin:0 0 8px;padding-left:20px}
.rich-area strong{font-weight:650}