:root{--color-primary: #2c3e50;--color-secondary: #18bc9c;--color-background: #f5f8fa;--color-text: #34495e;--color-text-light: #7f8c8d;--color-error: #e74c3c;--color-success: #27ae60;--font-family-base: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;--border-radius: 6px;--transition-speed: .3s}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font-family-base);background-color:var(--color-background);color:var(--color-text);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh}a{color:var(--color-secondary);text-decoration:none;transition:color var(--transition-speed)}a:hover,a:focus{color:var(--color-primary);outline:none}h1,h2,h3,h4,h5,h6{color:var(--color-primary);margin:0 0 .5rem;font-weight:600}p{margin:0 0 1rem}button{cursor:pointer;font-family:inherit;font-size:1rem;border:none;border-radius:var(--border-radius);padding:.5rem 1rem;background-color:var(--color-secondary);color:#fff;transition:background-color var(--transition-speed)}button:hover,button:focus{background-color:#149174;outline:none}button:disabled{background-color:#bdc3c7;cursor:not-allowed}input,select,textarea{font-family:inherit;font-size:1rem;padding:.5rem;border:1px solid #ccc;border-radius:var(--border-radius);width:100%;transition:border-color var(--transition-speed)}input:focus,select:focus,textarea:focus{border-color:var(--color-secondary);outline:none;box-shadow:0 0 5px var(--color-secondary)}label{display:block;margin-bottom:.25rem;font-weight:600;color:var(--color-text)}.form-group{margin-bottom:1rem}.container{max-width:960px;margin:0 auto;padding:1rem}.navbar{background-color:var(--color-primary);padding:1rem 2rem;color:#fff;display:flex;align-items:center;justify-content:space-between}.navbar a{color:#fff;margin-left:1rem;font-weight:600}.navbar a:hover,.navbar a:focus{color:var(--color-secondary)}.main-content{padding:2rem 1rem;background-color:#fff;border-radius:var(--border-radius);box-shadow:0 2px 8px #0000001a;margin-top:1rem}.card{background-color:#fff;border-radius:var(--border-radius);box-shadow:0 1px 4px #0000001a;padding:1rem 1.5rem;margin-bottom:1rem}.table{width:100%;border-collapse:collapse;margin-bottom:1rem}.table th,.table td{padding:.75rem 1rem;border:1px solid #ddd;text-align:left}.table th{background-color:var(--color-background);font-weight:600}.alert{padding:1rem 1.5rem;border-radius:var(--border-radius);margin-bottom:1rem;font-weight:600}.alert-error{background-color:#fdecea;color:var(--color-error);border:1px solid var(--color-error)}.alert-success{background-color:#e9f7ef;color:var(--color-success);border:1px solid var(--color-success)}.spinner{border:4px solid #f3f3f3;border-top:4px solid var(--color-secondary);border-radius:50%;width:36px;height:36px;animation:spin 1s linear infinite;margin:1rem auto}@keyframes spin{to{transform:rotate(360deg)}}.hidden{display:none!important}@media (max-width: 768px){.navbar{flex-direction:column;align-items:flex-start}.navbar a{margin-left:0;margin-top:.5rem}.container{padding:1rem .5rem}}