*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8f9fb;--surface: #ffffff;--border: #e2e8f0;--border-focus: #3b82f6;--text: #0f172a;--text-muted: #64748b;--text-light: #94a3b8;--primary: #3b82f6;--primary-hover: #2563eb;--primary-light: #eff6ff;--danger: #ef4444;--danger-hover: #dc2626;--danger-light: #fef2f2;--success: #22c55e;--success-light: #f0fdf4;--warning: #f59e0b;--warning-light: #fffbeb;--sidebar-width: 220px;--radius: 8px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -1px rgba(0,0,0,.04)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.5;color:var(--text);background:var(--bg)}.layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100}.sidebar-logo{padding:20px 16px 16px;font-size:18px;font-weight:700;color:var(--primary);border-bottom:1px solid var(--border)}.sidebar-nav{flex:1;padding:12px 8px;display:flex;flex-direction:column;gap:2px}.nav-link{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:6px;color:var(--text-muted);text-decoration:none;font-weight:500;transition:background .15s,color .15s}.nav-link:hover{background:var(--bg);color:var(--text)}.nav-link.active{background:var(--primary-light);color:var(--primary)}.nav-link svg{width:16px;height:16px;flex-shrink:0}.sidebar-footer{padding:12px 8px;border-top:1px solid var(--border)}.main-content{margin-left:var(--sidebar-width);flex:1;padding:28px 32px;min-height:100vh}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:24px}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:36px 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var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.card-body{padding:20px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-bottom:28px}.stat-card{padding:20px}.stat-label{font-size:12px;font-weight:500;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.stat-value{font-size:26px;font-weight:700;margin-top:4px}.stat-sub{font-size:12px;color:var(--text-muted);margin-top:2px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse}thead th{text-align:left;padding:10px 16px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);border-bottom:1px solid var(--border);white-space:nowrap}tbody tr{border-bottom:1px solid var(--border);transition:background .1s}tbody tr:last-child{border-bottom:none}tbody tr:hover{background:var(--bg)}td{padding:12px 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svg{width:15px;height:15px}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn-ghost:hover:not(:disabled){background:var(--bg);color:var(--text)}.btn-danger{background:var(--danger-light);color:var(--danger);border:1px solid transparent}.btn-danger:hover:not(:disabled){background:var(--danger);color:#fff}.btn-sm{padding:5px 10px;font-size:12px}.btn-lg{padding:11px 22px;font-size:15px;width:100%;justify-content:center}.badge{display:inline-block;padding:2px 8px;border-radius:100px;font-size:11px;font-weight:600;text-transform:capitalize}.badge-draft{background:#f1f5f9;color:#64748b}.badge-sent{background:#eff6ff;color:#3b82f6}.badge-viewed{background:#faf5ff;color:#7c3aed}.badge-paid{background:var(--success-light);color:#16a34a}.badge-overdue{background:var(--danger-light);color:var(--danger)}.badge-accepted{background:var(--success-light);color:#16a34a}.badge-rejected{background:var(--danger-light);color:var(--danger)}.badge-converted{background:#f0fdf4;color:#15803d}.badge-pending{background:var(--warning-light);color:#b45309}.alert{padding:10px 14px;border-radius:6px;font-size:13px}.alert-error{background:var(--danger-light);color:var(--danger);border:1px solid #fecaca}.alert-success{background:var(--success-light);color:#15803d;border:1px solid #bbf7d0}.alert-info{background:var(--primary-light);color:#1d4ed8;border:1px solid #bfdbfe}.items-table{width:100%;border-collapse:collapse}.items-table th{text-align:left;padding:6px 8px;font-size:11px;font-weight:600;text-transform:uppercase;color:var(--text-muted);border-bottom:1px solid var(--border)}.items-table td{padding:6px 8px}.items-table input{padding:6px 8px;font-size:13px}.items-total{text-align:right;padding-top:12px;font-size:15px;font-weight:600}.section-title{font-size:13px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state svg{width:40px;height:40px;margin-bottom:12px;opacity:.4}.empty-state h3{font-size:15px;color:var(--text);margin-bottom:4px}.empty-state p{font-size:13px;margin-bottom:16px}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.detail-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;margin-bottom:3px}.detail-value{font-size:14px}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite;margin:auto}.loading-screen{display:flex;align-items:center;justify-content:center;min-height:100vh}.pay-page{max-width:480px;margin:60px auto;padding:0 20px}.pay-logo{font-size:22px;font-weight:700;color:var(--primary);margin-bottom:28px}.text-muted{color:var(--text-muted)}.text-right{text-align:right}.text-bold{font-weight:600}.mt-4{margin-top:4px}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-16{margin-bottom:16px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.actions{display:flex;align-items:center;gap:8px}