:root {
  --bg: #f5f6f8; --surface: #ffffff; --surface-2: #f0f2f5; --text: #1b1f24; --muted: #5f6b7a; --border: #dde1e6;
  --accent: #2563eb; --accent-text: #ffffff; --ok: #15803d; --warn: #b45309; --bad: #b91c1c;
  --bw: #2563eb; --st: #0d9488; --en: #9333ea; --grid: #e6e9ee;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 1px 3px rgba(0,0,0,.06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216; --surface: #171b21; --surface-2: #1f242c; --text: #e7eaee; --muted: #9aa5b3; --border: #2b313a;
    --accent: #5b8dff; --accent-text: #0b0e12; --ok: #4ade80; --warn: #fbbf24; --bad: #f87171;
    --bw: #6b9bff; --st: #2dd4bf; --en: #c084fc; --grid: #262c35; --shadow: none;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.num { font-variant-numeric: tabular-nums; }

header.top { background: var(--surface); border-bottom: 1px solid var(--border); }
header.top .in { max-width: 1180px; margin: 0 auto; padding: 12px 16px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 17px; }
.brand small { font-weight: 500; color: var(--muted); margin-left: 6px; }
.spacer { flex: 1; }
.who { color: var(--muted); font-size: 14px; }
main { max-width: 1180px; margin: 0 auto; padding: 20px 16px 48px; }

.btn { border: 1px solid var(--border); background: var(--surface); padding: 7px 14px; border-radius: 8px; cursor: pointer; }
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn.danger { color: var(--bad); }
.btn.small { padding: 3px 10px; font-size: 13px; }
input, select, textarea { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 7px 10px; min-width: 0; }
textarea { width: 100%; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
label { display: block; font-size: 13px; color: var(--muted); }
label > input, label > select { display: block; width: 100%; margin-top: 4px; color: var(--text); }

.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar h1 { font-size: 20px; margin: 0 12px 0 0; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px; box-shadow: var(--shadow); }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-bottom: 16px; }
.kpi h3 { margin: 0 0 8px; font-size: 14px; font-weight: 600; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot.bandwidth { background: var(--bw); } .dot.storage { background: var(--st); } .dot.encoding { background: var(--en); }
.kpi .big { font-size: 30px; font-weight: 700; line-height: 1.2; }
.kpi .big small { font-size: 15px; font-weight: 500; color: var(--muted); margin-left: 4px; }
.kpi .sub { font-size: 13px; color: var(--muted); margin-top: 2px; }
.meter { height: 8px; border-radius: 4px; background: var(--surface-2); margin: 12px 0 6px; overflow: hidden; }
.meter > i { display: block; height: 100%; border-radius: 4px; background: var(--ok); }
.meter > i.warn { background: var(--warn); } .meter > i.bad { background: var(--bad); }
.meter-row { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); }
.up { color: var(--bad); } .down { color: var(--ok); }

.charts { display: grid; grid-template-columns: 1fr; gap: 14px; }
.chart-card h2 { font-size: 16px; margin: 0; }
.chart-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; margin-bottom: 8px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-left: auto; }
.seg button { border: 0; background: transparent; padding: 4px 12px; cursor: pointer; font-size: 13px; }
.seg button.on { background: var(--surface-2); font-weight: 600; }
.chart { width: 100%; height: 220px; display: block; }
.chart text { fill: var(--muted); font-size: 11px; }
.chart .grid { stroke: var(--grid); }
.chart .limit { stroke: var(--bad); stroke-dasharray: 4 4; }
.chart .bar.bandwidth { fill: var(--bw); } .chart .bar.storage { fill: var(--st); } .chart .bar.encoding { fill: var(--en); }
.chart .bar:hover { opacity: .75; }
.empty { padding: 40px 0; text-align: center; color: var(--muted); }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-weight: 600; color: var(--muted); font-size: 13px; background: var(--surface-2); }
td.r, th.r { text-align: right; }
.table-wrap { overflow-x: auto; }
tr.click { cursor: pointer; } tr.click:hover td { background: var(--surface-2); }
.badge { display: inline-block; padding: 1px 8px; border-radius: 10px; font-size: 12px; background: var(--surface-2); color: var(--muted); }
.badge.off { color: var(--bad); } .badge.admin { color: var(--accent); }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; overflow-x: auto; }
.tabs button { border: 0; background: none; padding: 10px 14px; cursor: pointer; border-bottom: 2px solid transparent; color: var(--muted); white-space: nowrap; }
.tabs button.on { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 12px; }
.section { margin-bottom: 18px; }
.section h2 { font-size: 16px; margin: 0 0 12px; }
.msg { font-size: 14px; margin-top: 8px; white-space: pre-line; }
.msg.err { color: var(--bad); } .msg.ok { color: var(--ok); }
code { background: var(--surface-2); padding: 1px 5px; border-radius: 4px; font-size: 13px; }
pre { background: var(--surface-2); padding: 12px; border-radius: 8px; overflow-x: auto; font-size: 13px; }

dialog { border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--text); padding: 20px; width: min(520px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(0,0,0,.4); }
dialog h2 { margin: 0 0 14px; font-size: 17px; }
.dlg-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login { width: min(380px, 100%); }
.login h1 { font-size: 20px; margin: 0 0 4px; }
.login p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
.login label { margin-bottom: 12px; }
.login .btn { width: 100%; padding: 10px; margin-top: 4px; }

#tip { position: fixed; pointer-events: none; background: var(--text); color: var(--bg); font-size: 12px; padding: 6px 8px; border-radius: 6px; opacity: 0; transition: opacity .1s; z-index: 10; white-space: nowrap; }

@media (max-width: 600px) {
  .kpi .big { font-size: 26px; }
  .chart { height: 180px; }
  .seg { margin-left: 0; }
}
label > input[type=checkbox] { display: inline; width: auto; margin: 0 6px 0 0; }
label:has(> input[type=checkbox]) { color: var(--text); font-size: 14px; }

/* 월별 청구서 */
.bill-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.bill-stats .card { padding: 12px 16px; }
.bill-stats b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.bill-stats span { font-size: 13px; color: var(--muted); }
td.wrap { white-space: normal; min-width: 180px; max-width: 360px; }
.warn-line { font-size: 13px; color: var(--warn); }
.small { font-size: 12px; }
.badge.ok { color: var(--ok); }
#tbl input[type=checkbox] { width: 16px; height: 16px; }

/* OTP 등록 */
.otp-setup { width: min(520px, 100%); }
.steps { padding-left: 20px; margin: 0 0 16px; font-size: 14px; display: grid; gap: 10px; }
.otp-key { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; margin: 8px 0; font-size: 14px; }
.otp-key dt { color: var(--muted); }
.otp-key dd { margin: 0; }
.otp-key code { font-size: 15px; letter-spacing: .04em; }
.otp-qr { display: block; margin: 10px 0; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.otp-setup .btn.small { width: auto; padding: 3px 10px; margin: 0; }

/* 자금관리 */
dialog.wide { width: min(900px, calc(100vw - 32px)); }
.dlg-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.dlg-head h2 { margin: 0; }
.kv { display: grid; grid-template-columns: max-content 1fr max-content 1fr; gap: 4px 14px; font-size: 14px; margin: 0 0 14px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; min-width: 0; }
@media (max-width: 640px) { .kv { grid-template-columns: max-content 1fr; } }
.tx-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-end; padding: 12px; background: var(--surface-2); border-radius: 8px; }
.tx-form label { flex: 0 1 150px; }
.tx-form label.grow { flex: 1 1 200px; }
label.inline { display: inline-flex; align-items: center; gap: 6px; color: var(--text); font-size: 14px; }
.badge.warn { color: var(--warn); }

/* 탭 권한: 보기 권한만 있으면 편집 버튼 숨김 (서버에서도 막음) */
body.ro #addCustomer, body.ro #importBilling, body.ro #addUser, body.ro [data-edit], body.ro .tabs [data-tab="upload"],
body.ro #genBtn, body.ro #sysUpdate, body.ro #checkBtn, body.ro #approveBtn, body.ro .regen, body.ro .pick, body.ro #all,
body.ro #addBtn, body.ro #csvBtn, body.ro #tForm, body.ro [data-tx], body.ro #dEdit { display: none !important; }
.perm-grid { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; margin: 0 0 12px; display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.perm-grid legend { font-size: 13px; color: var(--muted); padding: 0 4px; }

.chk-log { white-space: pre-wrap; max-height: 60vh; overflow: auto; font-size: 13px; background: var(--bg, #f6f7f9); padding: 12px; border-radius: 8px; }

.btn:disabled { opacity: .5; cursor: not-allowed; }

#cashTbl tr.total td { border-top: 2px solid var(--border); }
#cashTbl tr.today td { background: var(--surface-2); }
.num.neg { color: #c62828; }
#cashTxWrap { margin-top: 10px; max-height: 420px; overflow: auto; }