:root{--primary-color: #0056b3;--primary-hover: #004494;--success-color: #28a745;--error-color: #dc3545;--bg-color: #f4f7f6;--card-bg: #ffffff;--text-color: #333;--label-color: #555;--border-color: #ddd;--shadow-color: rgba(0, 0, 0, .08)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Poppins,sans-serif;background-color:var(--bg-color);color:var(--text-color);display:flex;flex-direction:column;min-height:100vh}header{background:var(--primary-color);padding:15px 5%;box-shadow:0 2px 4px var(--shadow-color);width:100%}header img{max-width:120px;height:auto;display:block}main{flex:1;display:flex;align-items:center;justify-content:center;padding:20px}.container{background:var(--card-bg);padding:30px;border-radius:12px;box-shadow:0 5px 25px var(--shadow-color);width:100%;max-width:420px;text-align:center;transform:translateY(-20px);animation:fadeIn .5s ease-out forwards}@keyframes fadeIn{to{opacity:1;transform:translateY(0)}}h2{margin-bottom:10px;font-size:1.8rem;font-weight:600}p{margin-bottom:25px;color:var(--label-color);font-size:.95rem}.form-group{text-align:left;margin-bottom:20px}label{display:block;margin-bottom:8px;font-weight:500;color:var(--label-color);font-size:.9rem}input[type=text]{width:100%;padding:12px 15px;border:1px solid var(--border-color);border-radius:8px;font-size:1rem;font-family:Poppins,sans-serif;transition:border-color .3s,box-shadow .3s}input[type=text]:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #0056b326}button{width:100%;padding:12px;background:var(--primary-color);border:none;border-radius:8px;color:#fff;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .3s,transform .2s;display:flex;align-items:center;justify-content:center;gap:8px}button:hover{background:var(--primary-hover);transform:translateY(-2px)}button:disabled{background-color:#a0a0a0;cursor:not-allowed}button .icon{display:block}button .spinner,button.loading .icon{display:none}button.loading .spinner{display:block}.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.resultado{margin-top:25px;min-height:50px;text-align:left}.alert{padding:12px 15px;border-radius:8px;font-size:.9rem;opacity:0;animation:fadeIn .4s forwards;border:1px solid transparent}.alert-success{background-color:#e9f7ef;color:#1d643b;border-color:#a3d9b8}.alert-error{background-color:#fdecea;color:#a3232f;border-color:#f5b0b7}.validation-error{color:var(--error-color);font-size:.8rem;margin-top:5px;text-align:left}