:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #cfd8e3;
  --border-soft: #e2e8f0;
  --accent: #0f172a;
  --accent-2: #1e293b;
  --success: #15803d;
  --danger: #b91c1c;
  --warning: #b45309;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.10);
  --radius: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: Arial, Helvetica, sans-serif; }
body { font-size: 15px; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .55; }

.app-shell { min-height: 100vh; padding: 18px; }
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: linear-gradient(135deg, #f8fafc, #e2e8f0); }
.login-card { width: min(450px, 100%); background: var(--panel); border: 1px solid var(--border); border-radius: 22px; padding: 34px; box-shadow: var(--shadow); }
.login-card h1 { margin: 0 0 6px; font-size: 30px; letter-spacing: -.03em; }
.login-card .hint { margin: 0 0 22px; color: var(--muted); line-height: 1.4; }
.logo-mark { width: 54px; height: 54px; display: grid; place-items: center; border-radius: 15px; background: var(--accent); color: #fff; font-weight: 800; margin-bottom: 16px; }

.header { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 4px 14px rgba(15, 23, 42, .06); padding: 16px 18px; display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.header h1 { font-size: 24px; margin: 0; letter-spacing: -.02em; }
.header p { margin: 4px 0 0; color: var(--muted); }
.header-actions { display:flex; gap: 8px; align-items:center; flex-wrap: wrap; }
.tabs { display:flex; gap:8px; flex-wrap: wrap; margin: 0 0 14px; }
.tab-btn, .btn { border: 1px solid var(--border); background: var(--panel); color: var(--text); padding: 10px 14px; border-radius: 10px; }
.tab-btn.active, .btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.danger { color: #fff; background: var(--danger); border-color: var(--danger); }
.btn.success { color: #fff; background: var(--success); border-color: var(--success); }
.btn.ghost { background: transparent; }

.grid { display:grid; gap: 14px; }
.grid.two { grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: 0 4px 16px rgba(15,23,42,.04); }
.panel h2 { margin: 0 0 10px; font-size: 20px; }
.panel h3 { margin: 18px 0 10px; font-size: 17px; }
.panel .sub { margin: -4px 0 12px; color: var(--muted); }
.toolbar { display:flex; gap:8px; align-items:center; justify-content:space-between; margin-bottom:12px; flex-wrap:wrap; }
.search { min-width: 260px; }

label { display:block; color: #475569; margin: 0 0 5px; font-size: 14px; }
input, select, textarea { width: 100%; border: 1px solid var(--border); border-radius: 9px; padding: 9px 10px; background: #fff; color: var(--text); min-height: 38px; }
textarea { min-height: 78px; resize: vertical; }
input:focus, select:focus, textarea:focus, button:focus { outline: 3px solid rgba(15,23,42,.15); outline-offset: 2px; }
.form-row { display:grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-bottom: 12px; }
.form-row.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.form-row.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.check-row { display:flex; gap:8px; align-items:center; margin: 8px 0 12px; color: var(--text); }
.check-row input { width:auto; min-height:auto; }

.table-wrap { overflow:auto; border:1px solid var(--border-soft); border-radius: 12px; background:#fff; }
table { width:100%; border-collapse: collapse; }
th, td { padding: 10px; text-align:left; border-bottom:1px solid var(--border-soft); vertical-align: top; }
th { color:#475569; background:#f8fafc; font-weight:700; font-size: 13px; }
tr:hover td { background:#f8fafc; }
.empty { padding: 38px; color: var(--muted); text-align:center; }
.row-actions { display:flex; gap:6px; flex-wrap:wrap; }
.badge { display:inline-flex; align-items:center; border-radius:999px; padding: 4px 8px; font-size: 12px; background:#e2e8f0; color:#334155; }
.badge.paid { background:#dcfce7; color:#166534; }
.badge.sent { background:#dbeafe; color:#1e40af; }
.badge.draft { background:#f1f5f9; color:#334155; }
.badge.cancelled { background:#fee2e2; color:#991b1b; }

.status-line { min-height: 24px; margin-top: 8px; font-weight: 700; }
.status-line.ok { color: var(--success); }
.status-line.err { color: var(--danger); }
.status-line.warn { color: var(--warning); }

.item-row { display:grid; grid-template-columns: 110px 1.6fr 90px 120px 90px 120px 90px; gap:8px; align-items:start; margin-bottom: 8px; }
.item-row.head { font-size: 13px; color: var(--muted); font-weight: 700; }
.total-box { width: min(420px, 100%); margin-left:auto; border: 1px solid var(--border-soft); border-radius:12px; overflow:hidden; }
.total-line { display:flex; justify-content:space-between; gap: 10px; padding: 10px 12px; border-bottom:1px solid var(--border-soft); }
.total-line:last-child { border-bottom:0; font-weight:800; font-size: 18px; background:#f8fafc; }
.preview-wrap { background:#fff; border:1px solid var(--border); border-radius:12px; padding: 22px; overflow:auto; }
.print-doc { max-width: 900px; margin: 0 auto; background:#fff; color:#000; }
.print-head { display:flex; justify-content:space-between; gap:20px; border-bottom: 2px solid #111827; padding-bottom:18px; margin-bottom:18px; }
.print-title h1 { margin:0; font-size: 28px; }
.print-company { text-align:right; line-height:1.4; }
.print-grid { display:grid; grid-template-columns:1fr 1fr; gap:20px; margin: 18px 0; }
.print-table th, .print-table td { border:1px solid #d1d5db; }
.print-totals { width: 330px; margin-left:auto; margin-top:14px; }
.small { font-size: 13px; color: var(--muted); }
.hidden { display: none !important; }

@media (max-width: 980px) {
  .grid.two, .grid.three { grid-template-columns: 1fr; }
  .form-row, .form-row.three, .form-row.four { grid-template-columns: 1fr; }
  .item-row { grid-template-columns: 1fr 1fr; }
  .item-row.head { display:none; }
  .header { align-items:flex-start; flex-direction:column; }
}

@media print {
  body { background:#fff; }
  .no-print { display:none !important; }
  .app-shell { padding:0; }
  .panel, .preview-wrap { border:0; box-shadow:none; padding:0; }
  .print-doc { max-width: none; }
}