:root{color-scheme:light;--bg: #f5f6f8;--panel: #ffffff;--border: #dfe3e8;--text: #1f2430;--muted: #6b7280;--primary: #1d4ed8;--primary-dark: #1e3a8a;--danger: #dc2626;--success: #15803d;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}a{color:var(--primary);text-decoration:none}.app-shell{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--primary-dark);color:#fff;padding:16px 0;flex-shrink:0}.sidebar h1{font-size:16px;padding:0 16px 16px;margin:0}.sidebar nav a,.sidebar nav .group-label{display:block;padding:8px 16px;color:#cbd5f5;font-size:14px}.sidebar nav a.active,.sidebar nav a:hover{background:#ffffff1a;color:#fff}.sidebar nav .group-label{color:#8ea0d8;text-transform:uppercase;font-size:11px;margin-top:12px}.main-content{flex:1;padding:24px;max-width:1200px}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.card{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:20px;margin-bottom:20px}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border)}th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase}tfoot td{font-weight:700;border-top:2px solid var(--border)}.text-right{text-align:right}input,select,textarea{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px}label{display:block;margin-bottom:12px;font-size:13px;color:var(--muted)}label span{display:block;margin-bottom:4px}button{background:var(--primary);color:#fff;border:none;padding:9px 16px;border-radius:6px;cursor:pointer;font-size:14px}button:hover{background:var(--primary-dark)}button.secondary{background:transparent;color:var(--primary);border:1px solid var(--primary)}button.danger{background:var(--danger)}button:disabled{opacity:.6;cursor:not-allowed}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.error-banner{background:#fee2e2;color:var(--danger);padding:10px 14px;border-radius:6px;margin-bottom:16px;font-size:14px}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.badge.posted{background:#dcfce7;color:var(--success)}.badge.cancelled{background:#fee2e2;color:var(--danger)}.badge.draft{background:#e5e7eb;color:var(--muted)}.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh}.auth-card{width:360px}.invoice-items-table input{padding:6px 8px}.summary-row{display:flex;justify-content:space-between;padding:4px 0;font-size:14px}.summary-row.total{font-weight:700;border-top:1px solid var(--border);margin-top:6px;padding-top:8px}