:root{font-family:Inter,system-ui,sans-serif;color:#172033;background:#f5f7fb}*{box-sizing:border-box}body{margin:0;min-width:320px;background:#f5f7fb}button,input{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:240px 1fr}.sidebar{background:#172033;color:#fff;padding:28px 18px}.brand{font-size:22px;font-weight:700;margin-bottom:32px}.nav-button{width:100%;border:0;background:transparent;color:#cbd5e1;text-align:left;padding:12px 14px;margin-bottom:8px;border-radius:8px;cursor:pointer}.nav-button.active,.nav-button:hover{background:#27334a;color:#fff}.main-content{padding:40px}.page-header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.page-header h1{margin:0 0 6px;font-size:30px}.page-header p{margin:0;color:#64748b}.table-card,.form-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px}.table-card{overflow:hidden}table{width:100%;border-collapse:collapse}th,td{padding:14px 16px;border-bottom:1px solid #e2e8f0;text-align:left}th{background:#f8fafc}.id-cell{font-family:ui-monospace,monospace;font-size:13px}.empty-cell{text-align:center;color:#64748b;padding:32px}.form-card{max-width:640px;padding:24px}form{display:grid;gap:12px}label{font-weight:600}input{padding:12px 14px;border:1px solid #cbd5e1;border-radius:8px}.primary-button,.secondary-button{border-radius:8px;padding:11px 16px;cursor:pointer}.primary-button{border:0;background:#2563eb;color:#fff;margin-top:8px}.secondary-button{background:#fff;border:1px solid #cbd5e1}.message,.error-box,.success-box{margin-top:16px;padding:14px 16px;border-radius:8px}.message{background:#fff;border:1px solid #e2e8f0}.error-box{background:#fff1f2;border:1px solid #fecdd3;color:#9f1239}.success-box{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}@media(max-width:720px){.app-shell{grid-template-columns:1fr}.main-content{padding:22px 16px}.table-card{overflow-x:auto}}