:root {
  --ink: #18212f;
  --ink-2: #3e4c5e;
  --muted: #6b7a8c;
  --line: #e2e7ee;
  --line-2: #eef1f5;
  --bg: #f5f7fa;
  --card: #ffffff;
  --accent: #1f5fd6;
  --accent-ink: #ffffff;
  --accent-soft: #e8effc;
  --side: #121a26;
  --side-ink: #c8d1dd;
  --ok: #157f4c;   --ok-soft: #e3f4ea;
  --warn: #a35a00; --warn-soft: #fdf1df;
  --bad: #b42318;  --bad-soft: #fdecea;
  --radius: 8px;
  --font: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 14px/1.5 var(--font); color: var(--ink); background: var(--bg); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 22px; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 14px; margin: 0 0 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-2); }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.center { text-align: center; }
.right { text-align: right; }
.nowrap { white-space: nowrap; }
.mono { font-family: var(--mono); font-size: 13px; white-space: nowrap; }
.inline { display: inline; }

/* shell */
.shell { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }
.sidebar { background: var(--side); color: var(--side-ink); display: flex; flex-direction: column; padding: 18px 12px; position: sticky; top: 0; height: 100vh; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 600; padding: 4px 8px 18px; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 30px; height: 30px; border-radius: 7px; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; flex: none; }
.sidebar nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.sidebar nav a { color: var(--side-ink); padding: 8px 10px; border-radius: 6px; }
.sidebar nav a:hover { background: rgba(255,255,255,.06); text-decoration: none; color: #fff; }
.sidebar nav a.active { background: rgba(255,255,255,.1); color: #fff; }
.nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: #7d8a9c; padding: 16px 10px 6px; }
.sidebar-foot { border-top: 1px solid rgba(255,255,255,.08); padding: 12px 10px 0; display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 13px; }
.sidebar-foot .who { width: 100%; color: #fff; margin-bottom: 4px; }
.sidebar-foot .who small { display: block; color: #7d8a9c; }
.sidebar-foot a, .sidebar-foot .linklike { color: var(--side-ink); }
.main { padding: 24px 32px 60px; min-width: 0; max-width: 1400px; }

/* page header */
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head .sub { color: var(--muted); margin-top: 2px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* cards & grids */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 18px; }
.card.flush { padding: 0; }
.card.flush > h3, .card.flush > .card-head { padding: 16px 20px 0; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; }
.card-head h3 { margin: 0; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.grid-3 { display: grid; grid-template-columns: 2fr 1fr; gap: 18px; }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; margin-bottom: 18px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.stat .value { font-size: 24px; font-weight: 650; margin-top: 4px; font-variant-numeric: tabular-nums; }
.stat.bad .value { color: var(--bad); }
.empty-state { text-align: center; padding: 40px; }

/* tables */
table.data { width: 100%; border-collapse: collapse; }
table.data th { text-align: left; font-weight: 600; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; padding: 10px 12px; border-bottom: 1px solid var(--line); background: #fafbfc; white-space: nowrap; }
table.data td { padding: 10px 12px; border-bottom: 1px solid var(--line-2); vertical-align: top; }
table.data tr:last-child td { border-bottom: 0; }
table.data tr:hover td { background: #fbfcfe; }
table.data .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.data tfoot td { font-weight: 600; border-top: 1px solid var(--line); }
.table-wrap { overflow-x: auto; }
.card.flush table.data { margin-top: 10px; }
.card.flush .empty { padding: 14px 20px 18px; color: var(--muted); }

dl.kv { display: grid; grid-template-columns: 140px 1fr; gap: 6px 12px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; }

/* badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; background: var(--line-2); color: var(--ink-2); white-space: nowrap; }
.badge-open, .badge-sent, .badge-active { background: var(--accent-soft); color: var(--accent); }
.badge-in_progress { background: #efe8fd; color: #5b34c7; }
.badge-waiting_customer, .badge-partial, .badge-paused, .badge-high { background: var(--warn-soft); color: var(--warn); }
.badge-resolved, .badge-paid { background: var(--ok-soft); color: var(--ok); }
.badge-closed, .badge-void, .badge-cancelled, .badge-inactive, .badge-draft, .badge-low { background: var(--line-2); color: var(--muted); }
.badge-urgent, .badge-overdue { background: var(--bad-soft); color: var(--bad); }
.badge-normal { background: transparent; color: var(--ink-2); padding-left: 0; }

/* forms */
form label { display: block; font-weight: 550; font-size: 13px; color: var(--ink-2); margin-bottom: 12px; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], input[type=search], select, textarea {
  display: block; width: 100%; margin-top: 4px; padding: 8px 10px; font: inherit; color: var(--ink);
  border: 1px solid #cfd7e1; border-radius: 6px; background: #fff;
}
textarea { min-height: 90px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
label.check { display: flex; gap: 8px; align-items: center; font-weight: 500; }
label.check input { margin: 0; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 0 14px; }
.form-actions { display: flex; gap: 10px; align-items: center; margin-top: 6px; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px 4px; margin: 0 0 14px; }
legend { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); padding: 0 6px; }
.hint { font-weight: 400; color: var(--muted); font-size: 12px; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: end; margin-bottom: 14px; }
.filters label { margin: 0; }
.filters input, .filters select { min-width: 160px; }
.filters label.check input { min-width: 0; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 6px; border: 1px solid #cfd7e1; background: #fff; color: var(--ink); font: inherit; font-weight: 550; cursor: pointer; white-space: nowrap; }
.btn:hover { background: #f4f6f9; text-decoration: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #1a51b8; }
.btn-danger { color: var(--bad); border-color: #f0c2bd; }
.btn-danger:hover { background: var(--bad-soft); }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }
.linklike { background: none; border: 0; padding: 0; font: inherit; color: var(--accent); cursor: pointer; }
.linklike.danger { color: var(--bad); }

/* flash */
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; border: 1px solid; }
.flash-success { background: var(--ok-soft); border-color: #b9e3c9; color: var(--ok); }
.flash-error { background: var(--bad-soft); border-color: #f4c7c2; color: var(--bad); }
.flash-info { background: var(--accent-soft); border-color: #c9d9f8; color: var(--accent); }

/* tabs */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 18px; flex-wrap: wrap; }
.tabs a { padding: 8px 14px; color: var(--ink-2); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs a.active { color: var(--accent); border-color: var(--accent); font-weight: 600; }
.tabs a:hover { text-decoration: none; color: var(--ink); }
.tabs .count { color: var(--muted); font-size: 12px; margin-left: 4px; }

/* ticket thread */
.thread { display: flex; flex-direction: column; gap: 12px; }
.msg { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.msg-head { display: flex; justify-content: space-between; gap: 10px; padding: 8px 14px; background: #fafbfc; border-bottom: 1px solid var(--line-2); border-radius: var(--radius) var(--radius) 0 0; font-size: 13px; }
.msg-body { padding: 12px 14px; white-space: pre-wrap; word-wrap: break-word; }
.msg.internal { border-color: #f1d9a8; }
.msg.internal .msg-head { background: var(--warn-soft); }
.msg.customer .msg-head { background: var(--accent-soft); }
.msg-meta { display: flex; gap: 10px; flex-wrap: wrap; padding: 0 14px 10px; font-size: 12px; color: var(--muted); }

/* login */
body.bare { display: grid; min-height: 100vh; place-items: center; }
.login-wrap { width: 100%; max-width: 380px; padding: 20px; }
.login-card { padding: 28px; }
.login-brand { display: flex; gap: 12px; align-items: center; margin-bottom: 20px; }
.login-brand small { display: block; color: var(--muted); }

/* invoice document (screen + print) */
.invoice-doc { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 40px 44px; max-width: 900px; }
.balance-due { font-size: 26px; font-weight: 700; }

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .sidebar nav { flex-direction: row; flex-wrap: wrap; }
  .main { padding: 18px 16px 40px; }
  .grid-2, .grid-3, .stats { grid-template-columns: 1fr; }
}
@media print {
  .sidebar, .page-head .actions, .no-print, .flash { display: none !important; }
  .shell { display: block; }
  .main { padding: 0; }
  body { background: #fff; }
  .invoice-doc { border: 0; padding: 0; max-width: none; }
}