:root {
  --bg: #f4f6f8; --card: #fff; --text: #1f2937; --muted: #6b7280;
  --border: #e5e7eb; --primary: #2563eb; --danger: #dc2626;
  --sidebar: #111827; --sidebar-text: #e5e7eb; --ok: #059669; --warn: #d97706;
  --radius: 10px; --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
body.app { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.sidebar { background: var(--sidebar); color: var(--sidebar-text); padding: 1rem; display: flex; flex-direction: column; gap: .75rem; }
.brand { font-weight: 700; letter-spacing: .02em; padding: .25rem .35rem .75rem; border-bottom: 1px solid #374151; }
.sidebar nav { display: flex; flex-direction: column; gap: .25rem; flex: 1; }
.sidebar a { color: var(--sidebar-text); padding: .45rem .6rem; border-radius: 8px; }
.sidebar a.active, .sidebar a:hover { background: #1f2937; text-decoration: none; }
.sidebar-foot { border-top: 1px solid #374151; padding-top: .75rem; font-size: .85rem; }
.sidebar-foot .user { margin-bottom: .4rem; color: #9ca3af; word-break: break-all; }
.main { padding: 0 0 2rem; }
.topbar { padding: 1rem 1.25rem .25rem; }
.topbar h1 { margin: 0; font-size: 1.25rem; }
.content, .flashes { padding: 0 1.25rem; }
.flashes { display: grid; gap: .5rem; margin-bottom: .75rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: .75rem; }
.card-head h2, .card h2 { margin: 0; font-size: 1.05rem; }
.grid.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; margin-bottom: 1rem; }
.stat-label { color: var(--muted); font-size: .8rem; }
.stat-value { font-size: 1.6rem; font-weight: 700; margin-top: .2rem; }
.stat-value.small { font-size: .95rem; font-weight: 600; }
.table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.table th, .table td { text-align: left; padding: .55rem .4rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table.dense th { width: 140px; color: var(--muted); font-weight: 500; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.actions { white-space: nowrap; }
.actions a { margin-right: .6rem; }
.btn { display: inline-flex; align-items: center; gap: .35rem; border: 1px solid var(--border); background: #fff; color: var(--text); border-radius: 8px; padding: .45rem .75rem; cursor: pointer; font: inherit; }
.btn:hover { background: #f9fafb; text-decoration: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { filter: brightness(.95); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-ghost { background: transparent; }
.btn-sm { padding: .3rem .55rem; font-size: .85rem; }
.stack { display: grid; gap: .75rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem 1rem; }
.form-grid .full { grid-column: 1 / -1; }
label { display: grid; gap: .3rem; font-size: .85rem; color: var(--muted); }
label.check { display: flex; align-items: center; gap: .45rem; margin-top: 1.4rem; color: var(--text); }
input, select, textarea { font: inherit; padding: .45rem .55rem; border: 1px solid var(--border); border-radius: 8px; color: var(--text); background: #fff; }
.form-actions { display: flex; gap: .5rem; align-items: center; margin-top: .25rem; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85em; }
.badge { display: inline-block; padding: .15rem .45rem; border-radius: 999px; background: #e5e7eb; font-size: .75rem; }
.badge.ok { background: #d1fae5; color: var(--ok); }
.badge.warn { background: #ffedd5; color: var(--warn); }
.alert { padding: .65rem .8rem; border-radius: 8px; border: 1px solid var(--border); background: #fff; }
.alert-success { background: #ecfdf5; border-color: #a7f3d0; }
.alert-error, .alert-danger { background: #fef2f2; border-color: #fecaca; }
.alert-warning { background: #fffbeb; border-color: #fde68a; }
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 1rem; }
.login-card { width: min(380px, 100%); }
.login-card h1 { margin: 0 0 .25rem; }
.filter-row { margin-bottom: .75rem; }
.inline, .inline-delete { display: inline; }
.mt { margin-top: 1rem; }
@media (max-width: 900px) {
  body.app { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; align-items: center; }
  .sidebar nav { flex-direction: row; flex-wrap: wrap; }
  .sidebar-foot { border: 0; margin-left: auto; }
  .grid.stats { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}

.period-section .customer-block { border-top: 1px solid var(--border); padding-top: .85rem; margin-top: .85rem; }
.period-section .customer-block:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
.customer-block-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .4rem; }
.card-head .muted { font-weight: 500; font-size: .9rem; }