:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --line: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  background: #0f172a;
  color: #fff;
  padding: 0 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}
header .brand { font-weight: 700; font-size: 16px; margin-right: 16px; padding: 12px 0; }
header nav { display: flex; flex-wrap: wrap; gap: 2px; flex: 1; }
header nav a {
  color: #cbd5e1;
  padding: 12px 12px;
  border-bottom: 3px solid transparent;
}
header nav a:hover { color: #fff; text-decoration: none; }
header nav a.active { color: #fff; border-bottom-color: var(--primary); }
header .user { color: #94a3b8; font-size: 13px; padding: 12px 0 12px 12px; }
header .user a { color: #f87171; margin-left: 10px; }
.nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 22px; line-height: 1; cursor: pointer; padding: 8px; margin-left: auto; }

.container { max-width: 1200px; margin: 20px auto; padding: 0 16px; }
h1 { font-size: 20px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 0 0 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 18px;
}

.cards-row { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.stat {
  flex: 1; min-width: 180px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.stat .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
.stat .value { font-size: 22px; font-weight: 700; margin-top: 4px; }
.value.pos { color: var(--green); }
.value.neg { color: var(--red); }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--line); }
th { background: #f8fafc; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .02em; }
td.num, th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
tbody tr:hover { background: #f8fafc; }
tr.total td { font-weight: 700; border-top: 2px solid var(--line); background: #f1f5f9; }

input, select, textarea, button {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--cbd, #cbd5e1);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: 2px solid #bfdbfe; border-color: var(--primary); }
label { font-size: 12px; color: var(--muted); display: block; margin-bottom: 3px; }

.btn {
  background: var(--primary); color: #fff; border: none; cursor: pointer; font-weight: 600;
}
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 5px 9px; font-size: 13px; border-radius: 6px; }
.btn-ghost { background: #fff; color: var(--text); border: 1px solid var(--line); }
.btn-ghost:hover { background: #f1f5f9; }
.btn-danger { background: var(--red); color: #fff; border: none; cursor: pointer; }
.btn-danger:hover { background: #b91c1c; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; align-items: start; }
.form-grid > div { min-width: 0; }
.form-grid input, .form-grid select, .form-grid textarea { width: 100%; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }
.form-row > div { min-width: 0; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: start; }
.filters > div { min-width: 0; }
.filters input, .filters select { max-width: 100%; }
.filters .grow { flex: 1; min-width: 160px; }
.filters .grow input, .filters .grow select { width: 100%; }

.badge { font-size: 11px; padding: 2px 8px; border-radius: 20px; background: #e2e8f0; color: #475569; }
.badge.op { background: #dbeafe; color: #1e40af; }
.badge.inv { background: #fef3c7; color: #92400e; }
.badge.fin { background: #ede9fe; color: #6d28d9; }

.muted { color: var(--muted); }
.right { text-align: right; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; }
.msg.ok { background: #dcfce7; color: #166534; }
.msg.err { background: #fee2e2; color: #991b1b; }
details.editrow { display: inline; }
details summary { cursor: pointer; list-style: none; }
details summary::-webkit-details-marker { display: none; }

.login-wrap { max-width: 360px; margin: 8vh auto; }
.login-wrap .card { padding: 28px; }
.login-wrap h1 { text-align: center; }
.login-wrap .field { margin-bottom: 14px; }
.login-wrap input { width: 100%; }
.login-wrap .btn { width: 100%; margin-top: 6px; }

.dds-table { overflow-x: auto; }
.dds-table table { min-width: 1000px; }
.dds-table .row-header td { font-weight: 700; background: #eef2ff; }
.dds-table .row-subtotal td { font-weight: 700; background: #f1f5f9; }
.dds-table .row-balance td { font-weight: 700; background: #ecfdf5; }

@media (max-width: 820px) {
  header { flex-wrap: wrap; }
  .nav-toggle { display: block; }
  header nav, header .user {
    flex-basis: 100%;
    width: 100%;
    display: none;
    flex-direction: column;
    gap: 0;
  }
  body.nav-open header nav, body.nav-open header .user { display: flex; }
  header nav a {
    padding: 12px 4px;
    border-bottom: none;
    border-left: 3px solid transparent;
  }
  header nav a.active { border-left-color: var(--primary); }
  header .user { padding: 8px 0 12px; border-top: 1px solid rgba(255,255,255,.1); }
  header .user a { margin-left: 0; margin-right: 16px; }
  .card { overflow-x: auto; }
  .container { margin: 14px auto; }
}

@media (max-width: 540px) {
  .form-grid { grid-template-columns: 1fr; }
  .cards-row { gap: 10px; }
  .stat { min-width: 0; flex-basis: 100%; }
  .stat .value { font-size: 18px; }
  h1 { font-size: 18px; }
}