:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --border: #e2e4e9;
  --text: #1f2430;
  --text-muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; min-height: 100vh; }

nav.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: #171b26;
  color: #cbd2e0;
  padding: 20px 0;
}
nav.sidebar .brand {
  font-weight: 700;
  font-size: 17px;
  color: #fff;
  padding: 0 20px 20px;
  border-bottom: 1px solid #2a3040;
  margin-bottom: 10px;
}
nav.sidebar a {
  display: block;
  padding: 10px 20px;
  color: #cbd2e0;
  font-size: 14px;
}
nav.sidebar a:hover { background: #232838; text-decoration: none; }
nav.sidebar a.active { background: var(--primary); color: #fff; }
nav.sidebar form { padding: 10px 20px; margin-top: 10px; border-top: 1px solid #2a3040; }
nav.sidebar button.logout {
  background: none; border: none; color: #cbd2e0; cursor: pointer; font-size: 14px; padding: 0;
}
nav.sidebar button.logout:hover { color: #fff; }

main.content { flex: 1; padding: 28px 32px; max-width: 1200px; }

h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 0 0 12px; }
.subtitle { color: var(--text-muted); margin-bottom: 20px; }

.page-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px; flex-wrap: wrap; gap: 10px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}
.stat-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.stat-box .value { font-size: 24px; font-weight: 700; }
.stat-box .label { color: var(--text-muted); font-size: 13px; margin-top: 4px; }
.stat-box.warn .value { color: var(--red); }

table { width: 100%; border-collapse: collapse; }
table th, table td {
  text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px;
}
table th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
table tr:hover td { background: #fafbfc; }
table.compact td, table.compact th { padding: 7px 10px; }

.btn {
  display: inline-block; background: var(--primary); color: #fff; border: none;
  padding: 9px 16px; border-radius: 6px; cursor: pointer; font-size: 14px; font-weight: 500;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn.secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { background: #f4f5f7; }
.btn.danger { background: #fff; color: var(--red); border: 1px solid #f3c6c6; }
.btn.danger:hover { background: #fef2f2; }
.btn.small { padding: 5px 10px; font-size: 12px; }

.badge {
  display: inline-block; padding: 3px 9px; border-radius: 20px; font-size: 12px; font-weight: 600;
  background: #eef1f6; color: #444;
}
.badge.blue { background: #dbeafe; color: #1d4ed8; }
.badge.green { background: #dcfce7; color: #15803d; }
.badge.red { background: #fee2e2; color: #b91c1c; }
.badge.amber { background: #fef3c7; color: #b45309; }
.badge.gray { background: #f1f2f4; color: #555; }

form .field { margin-bottom: 14px; }
form label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; color: #374151; }
form input[type=text], form input[type=email], form input[type=number],
form input[type=date], form input[type=password], form select, form textarea {
  width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--text);
}
form textarea { resize: vertical; min-height: 70px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
@media (max-width: 700px) {
  .form-row, .form-row3 { grid-template-columns: 1fr; }
}

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.alert.error { background: #fef2f2; color: #b91c1c; border: 1px solid #f3c6c6; }
.alert.success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf0cf; }

.items-table th, .items-table td { padding: 6px; }
.items-table input { padding: 7px 8px; }
.items-table .col-desc { width: 42%; }
.items-table .col-qty { width: 12%; }
.items-table .col-unit { width: 12%; }
.items-table .col-price { width: 16%; }
.items-table .col-total { width: 14%; text-align: right; }
.items-table .remove-row { color: var(--red); background: none; border: none; cursor: pointer; font-size: 16px; }

.totals-box { max-width: 320px; margin-left: auto; margin-top: 14px; }
.totals-box .row { display: flex; justify-content: space-between; padding: 5px 0; font-size: 14px; }
.totals-box .row.total { font-weight: 700; font-size: 17px; border-top: 1px solid var(--border); margin-top: 6px; padding-top: 10px; }

.actions-bar { display: flex; gap: 8px; flex-wrap: wrap; }

.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg);
}
.login-box { background: #fff; padding: 36px; border-radius: 10px; border: 1px solid var(--border); width: 340px; }
.login-box h1 { text-align: center; margin-bottom: 4px; }
.login-box .subtitle { text-align: center; margin-bottom: 22px; }
.login-box .btn { width: 100%; padding: 10px; margin-top: 6px; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-muted); }

.detail-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; }
@media (max-width: 900px) { .detail-grid { grid-template-columns: 1fr; } }

.info-list dt { font-size: 12px; color: var(--text-muted); margin-top: 10px; }
.info-list dd { margin: 2px 0 0; font-size: 14px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tabs a { padding: 8px 14px; font-size: 13px; color: var(--text-muted); border-bottom: 2px solid transparent; }
.tabs a.active { color: var(--primary); border-color: var(--primary); font-weight: 600; }