:root{--navy: #0f2440;--navy-light: #1c3a63;--teal: #0f9b8e;--gold: #d4af37;--bg: #f5f7fa;--card: #ffffff;--border: #e2e8f0;--text: #1a202c;--muted: #64748b;--danger: #dc2626;--success: #16a34a}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text)}.app-layout{display:flex;min-height:100vh}.sidebar{width:230px;background:var(--navy);color:#fff;display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:22px 20px;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-header h1{font-size:17px;margin:0;color:#fff}.sidebar-header span{font-size:11px;color:var(--gold);letter-spacing:.5px}.nav-item{padding:13px 20px;cursor:pointer;font-size:14px;color:#ffffffbf;border-left:3px solid transparent;transition:all .15s}.nav-item:hover{background:var(--navy-light);color:#fff}.nav-item.active{background:var(--navy-light);color:#fff;border-left:3px solid var(--teal);font-weight:600}.main-content{flex:1;padding:28px 34px;overflow-y:auto}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.page-header h2{margin:0 0 4px;font-size:22px}.page-header p{margin:0;color:var(--muted);font-size:13.5px}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:20px;margin-bottom:20px}table{width:100%;border-collapse:collapse;font-size:13.5px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}th{background:#f8fafc;color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.4px}tr:hover td{background:#fafbfc}.btn{background:var(--teal);color:#fff;border:none;padding:9px 16px;border-radius:6px;cursor:pointer;font-size:13.5px;font-weight:600}.btn:hover{opacity:.9}.btn.secondary{background:#fff;color:var(--navy);border:1px solid var(--border)}.btn.danger{background:var(--danger)}.btn.small{padding:5px 10px;font-size:12px}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:14px}input,select{width:100%;padding:9px 10px;border:1px solid var(--border);border-radius:6px;font-size:13.5px}label{font-size:12px;color:var(--muted);margin-bottom:4px;display:block;font-weight:600}.badge{padding:2px 9px;border-radius:20px;font-size:11.5px;font-weight:700}.badge.low{background:#fee2e2;color:var(--danger)}.badge.ok{background:#dcfce7;color:var(--success)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:18px 20px}.stat-card .value{font-size:26px;font-weight:700;color:var(--navy)}.stat-card .label{font-size:12.5px;color:var(--muted);margin-top:4px}.error-msg{background:#fee2e2;color:var(--danger);padding:8px 12px;border-radius:6px;font-size:13px;margin-bottom:12px}.billing-layout{display:grid;grid-template-columns:1.5fr 1fr;gap:20px}.product-card{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border:1px solid var(--border);border-radius:8px;margin-bottom:8px}.cart-line{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--border);font-size:13.5px}.total-row{display:flex;justify-content:space-between;padding:6px 0;font-size:14px}.total-row.grand{font-weight:700;font-size:17px;border-top:2px solid var(--navy);margin-top:8px;padding-top:10px}.tag{display:inline-block;background:#eef2f7;color:var(--navy);padding:2px 8px;border-radius:5px;font-size:11.5px;margin-right:4px}