:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;color:#1a1a2e;background:#f4f6fb}*{box-sizing:border-box}body{margin:0}a{color:#4f46e5;text-decoration:none}.container{max-width:1100px;margin:0 auto;padding:24px}.card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 12px #0000000f}.btn{background:#4f46e5;color:#fff;border:none;padding:10px 16px;border-radius:8px;cursor:pointer;font-size:14px}.btn:hover{background:#4338ca}.btn-danger{background:#dc2626}.btn-danger:hover{background:#b91c1c}.btn-secondary{background:#e5e7eb;color:#111}.btn-secondary:hover{background:#d1d5db}input,select{padding:8px 10px;border:1px solid #d1d5db;border-radius:6px;font-size:14px}table{width:100%;border-collapse:collapse}th,td{padding:10px 12px;text-align:left;border-bottom:1px solid #eee}th{font-weight:600;color:#555}.nav{display:flex;gap:16px;align-items:center;padding:16px 24px;background:#1a1a2e;color:#fff}.nav a{color:#c7d2fe}.nav a.active{color:#fff;font-weight:600}.error{color:#dc2626;font-size:14px}.warning{color:#d97706;font-size:14px}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center}.login-form{width:360px;display:flex;flex-direction:column;gap:12px}