*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f5f5f3; --surface: #ffffff; --border: #e2e0d8; --border-light: #edebe4;
  --text: #1a1a18; --text-muted: #6b6b66; --text-hint: #9b9b94;
  --blue: #185FA5; --blue-bg: #E6F1FB; --green: #27500A; --green-bg: #EAF3DE;
  --amber: #633806; --amber-bg: #FAEEDA; --red: #791F1F; --red-bg: #FCEBEB;
  --radius: 8px; --radius-lg: 12px;
}
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; font-size: 14px; background: var(--bg); color: var(--text); line-height: 1.5; }
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 1.5rem; height: 52px; gap: 2rem; position: sticky; top: 0; z-index: 50; }
.brand { font-weight: 600; font-size: 15px; white-space: nowrap; }
.topbar-nav { display: flex; gap: 4px; flex: 1; }
.nav-btn { background: none; border: none; padding: 6px 12px; cursor: pointer; font-size: 13px; color: var(--text-muted); border-radius: var(--radius); }
.nav-btn:hover { background: var(--bg); color: var(--text); }
.nav-btn.active { background: var(--bg); color: var(--text); font-weight: 500; }
.topbar-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.username { font-size: 13px; color: var(--text-muted); }
.btn-link { font-size: 13px; color: var(--text-muted); text-decoration: none; }
.btn-link:hover { color: var(--text); }
.content { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }
.tab { display: none; } .tab.active { display: block; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 1.5rem; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1rem 1.25rem; }
.stat-label { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }
.stat-val { font-size: 24px; font-weight: 500; }
.stat-val.green { color: var(--green); } .stat-val.amber { color: #BA7517; } .stat-val.red { color: var(--red); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 700px) { .two-col { grid-template-columns: 1fr; } }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.panel-head { padding: 10px 14px; font-size: 13px; font-weight: 500; border-bottom: 1px solid var(--border-light); }
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th { text-align: left; padding: 8px 12px; font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted); border-bottom: 1px solid var(--border); background: var(--bg); }
.tbl td { padding: 9px 12px; border-bottom: 1px solid var(--border-light); vertical-align: middle; }
.tbl tbody tr:last-child td { border-bottom: none; }
.tbl tbody tr:hover td { background: #fafaf8; cursor: pointer; }
.toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; }
.search-input { flex: 1; min-width: 180px; padding: 7px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 13px; background: var(--surface); }
.filter-select { padding: 7px 10px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 13px; background: var(--surface); }
.search-input:focus, .filter-select:focus { outline: none; border-color: #888; }
.btn { padding: 7px 14px; font-size: 13px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); cursor: pointer; color: var(--text); white-space: nowrap; }
.btn:hover { background: var(--bg); }
.btn.primary { background: var(--text); color: var(--surface); border-color: var(--text); }
.btn.primary:hover { opacity: 0.85; }
.btn.sm { padding: 4px 10px; font-size: 12px; }
.btn.danger { color: var(--red); border-color: #fca5a5; }
.btn.danger:hover { background: var(--red-bg); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 500; }
.badge.draft { background: #f1f0eb; color: #5a5a55; }
.badge.sent { background: var(--blue-bg); color: var(--blue); }
.badge.paid { background: var(--green-bg); color: var(--green); }
.badge.overdue { background: var(--red-bg); color: var(--red); }
.badge.partial { background: var(--amber-bg); color: var(--amber); }
.overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 200; align-items: flex-start; justify-content: center; padding: 40px 16px; overflow-y: auto; }
.overlay.open { display: flex; }
.modal { background: var(--surface); border-radius: var(--radius-lg); border: 1px solid var(--border); padding: 1.5rem; width: 100%; max-width: 480px; position: relative; }
.modal.modal-lg { max-width: 620px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.25rem; }
.modal-header h2 { font-size: 16px; font-weight: 500; }
.close-btn { background: none; border: none; cursor: pointer; font-size: 16px; color: var(--text-muted); padding: 4px; }
.close-btn:hover { color: var(--text); }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--border-light); }
.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 7px 10px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 13px; background: var(--surface); color: var(--text); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: #888; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.span-2 { grid-column: span 2; }
.section-label { font-size: 12px; font-weight: 500; color: var(--text-muted); margin: 12px 0 6px; }
.li-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-bottom: 8px; }
.li-table th { font-size: 11px; color: var(--text-muted); padding: 4px 6px; border-bottom: 1px solid var(--border-light); font-weight: 500; text-align: left; }
.li-table td { padding: 3px 4px; }
.li-table input { width: 100%; padding: 4px 7px; border: 1px solid var(--border); border-radius: 5px; font-size: 12px; background: var(--surface); color: var(--text); }
.li-table input:focus { outline: none; border-color: #888; }
.inv-totals { text-align: right; margin-top: 8px; }
.total-line { display: flex; justify-content: flex-end; gap: 24px; padding: 3px 0; font-size: 13px; color: var(--text-muted); }
.total-line span:last-child { min-width: 80px; text-align: right; color: var(--text); }
.total-main { font-weight: 500; font-size: 14px; border-top: 1px solid var(--border-light); margin-top: 4px; padding-top: 6px; }
.total-main span { color: var(--text) !important; }
.info-bar { font-size: 12px; color: var(--text-muted); background: var(--bg); border-radius: var(--radius); padding: 6px 10px; margin-bottom: 10px; }
.info-bar:empty { display: none; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 1rem; margin-bottom: 1rem; }
.detail-row { display: flex; flex-direction: column; padding: 4px 0; border-bottom: 1px solid var(--border-light); }
.detail-row.span-2 { grid-column: span 2; }
.detail-key { font-size: 11px; color: var(--text-muted); margin-bottom: 2px; }
.detail-val { font-size: 13px; }
.empty-state { text-align: center; padding: 2.5rem 1rem; color: var(--text-muted); font-size: 13px; }
.user-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border-light); font-size: 13px; }
.user-row:last-child { border-bottom: none; }
.badge.retainage { background: #F0E6FF; color: #5B1F8F; }