*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #2563eb;--primary-dark: #1d4ed8;--bg: #f8fafc;--card: #ffffff;--text: #1e293b;--text-secondary: #64748b;--border: #e2e8f0;--danger: #ef4444;--success: #22c55e;--warning: #f59e0b;--radius: 8px}body{font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}button{cursor:pointer}input,select,textarea{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;width:100%;background:var(--card)}input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:-2px}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border:none;border-radius:var(--radius);font-size:14px;font-weight:600;transition:all .15s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-danger{background:var(--danger);color:#fff}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--border)}.btn-sm{padding:6px 12px;font-size:13px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.layout{display:flex;min-height:100vh}.sidebar{width:240px;background:var(--primary);color:#fff;padding:20px 0;display:flex;flex-direction:column}.sidebar h1{font-size:20px;padding:0 20px 20px;margin-bottom:8px}.sidebar a{color:#ffffffd9;text-decoration:none;padding:10px 20px;display:block;font-size:14px}.sidebar a:hover,.sidebar a.active{background:#ffffff26;color:#fff}.main{flex:1;padding:32px;overflow-y:auto}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:13px;font-weight:600;margin-bottom:4px;color:var(--text-secondary)}.form-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}.table{width:100%;border-collapse:collapse;font-size:14px}.table th,.table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border)}.table th{background:var(--bg);font-weight:600;color:var(--text-secondary);font-size:12px;text-transform:uppercase}.table tr:hover td{background:#f1f5f9}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.badge-pending{background:#fef3c7;color:#92400e}.badge-paid{background:#dcfce7;color:#166534}.page-title{font-size:28px;font-weight:700;margin-bottom:24px}.alert{padding:12px 16px;border-radius:var(--radius);margin-bottom:16px;font-size:14px}.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.auth-page{display:flex;justify-content:center;align-items:center;min-height:100vh;background:var(--bg)}.auth-card{width:100%;max-width:400px}.auth-card h1{text-align:center;margin-bottom:24px}.pagination{display:flex;justify-content:center;gap:8px;margin-top:24px}.pagination button{padding:8px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);font-size:14px}.pagination button:hover{background:var(--bg)}.pagination button.active{background:var(--primary);color:#fff;border-color:var(--primary)}