:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #4f46e5;
  --accent-ink: #ffffff;
}

* { box-sizing: border-box; }

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

.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar .brand { font-weight: 700; font-size: 1.1rem; }
.topbar nav a {
  margin-left: 18px;
  color: var(--muted);
  text-decoration: none;
  font-size: .92rem;
}
.topbar nav a:hover, .topbar nav a.active { color: var(--accent); }

.container { max-width: 1000px; margin: 28px auto; padding: 0 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

h1 { font-size: 1.4rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }

.flex-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 8px; text-align: left; border-bottom: 1px solid var(--line); font-size: .92rem; }
th { color: var(--muted); font-weight: 600; text-transform: uppercase; font-size: .74rem; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }

.badge {
  color: #fff;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  font-size: .9rem;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { opacity: .9; color: var(--accent-ink); }
.btn-danger { color: #dc2626; border-color: #dc2626; }
.btn-sm { padding: 5px 10px; font-size: .8rem; }

label { display: block; font-size: .85rem; margin-bottom: 5px; color: var(--muted); }
input, select, textarea {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: .92rem;
  font-family: inherit;
  margin-bottom: 14px;
  background: #fff;
  color: var(--ink);
}
textarea { resize: vertical; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0 16px; }

.items-table input { margin-bottom: 0; }
.items-table td { vertical-align: top; }
.line-total { padding-top: 9px; font-size: .92rem; }

.totals { margin-left: auto; width: 280px; }
.totals div { display: flex; justify-content: space-between; padding: 6px 0; font-size: .92rem; }
.totals .grand { font-weight: 700; font-size: 1.1rem; border-top: 1px solid var(--line); margin-top: 6px; padding-top: 10px; }

.muted { color: var(--muted); }
.text-right { text-align: right; }
.empty { text-align: center; padding: 40px 0; color: var(--muted); }

.alert {
  padding: 10px 14px;
  border-radius: 7px;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  margin-bottom: 16px;
  font-size: .9rem;
}

@media print {
  .no-print { display: none !important; }
  body { background: #fff; }
  .container { max-width: 100%; margin: 0; }
  .card { border: none; padding: 0; }
}

@media (max-width: 700px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}