:root{--primary: #2563eb;--primary-hover: #1d4ed8;--bg-dark: #f1f5f9;--bg-white: #ffffff;--text-main: #0f172a;--text-muted: #64748b;--border: #e2e8f0}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-dark);color:var(--text-main)}.app-container{display:flex;height:100vh}.sidebar{width:250px;background:var(--bg-white);border-right:1px solid var(--border);padding:1rem}.sidebar .logo{font-size:1.5rem;font-weight:700;color:var(--primary);margin-bottom:2rem}.sidebar ul{list-style:none;padding:0}.sidebar li{margin-bottom:.5rem}.sidebar a{display:block;padding:.75rem 1rem;text-decoration:none;color:var(--text-muted);border-radius:6px;transition:all .2s}.sidebar li.active a,.sidebar a:hover{background-color:#eff6ff;color:var(--primary);font-weight:500}.content{flex:1;padding:2rem;overflow-y:auto}h1{margin-top:0}.card{background:white;padding:1.5rem;border-radius:8px;box-shadow:0 1px 3px #0000001a;margin-bottom:1.5rem}.btn{background:var(--primary);color:#fff;border:none;padding:.5rem 1rem;border-radius:4px;cursor:pointer}.btn:hover{background:var(--primary-hover)}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:.75rem;border-bottom:1px solid var(--border);text-align:left}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.form-group input,.form-group select{width:100%;padding:.5rem;border:1px solid var(--border);border-radius:4px}