* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow-x: hidden;
        }

        /* Efectos de fondo animados */
        .background-shapes {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
        }

        .shape {
            position: absolute;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            animation: float 6s ease-in-out infinite;
        }

        .shape:nth-child(1) {
            width: 100px;
            height: 100px;
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }

        .shape:nth-child(2) {
            width: 150px;
            height: 150px;
            top: 60%;
            right: 15%;
            animation-delay: 2s;
        }

        .shape:nth-child(3) {
            width: 80px;
            height: 80px;
            bottom: 20%;
            left: 20%;
            animation-delay: 4s;
        }

        .shape:nth-child(4) {
            width: 120px;
            height: 120px;
            top: 10%;
            right: 30%;
            animation-delay: 1s;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(180deg); }
        }

        .login-container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 25px;
            padding: 50px 40px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
            width: 100%;
            max-width: 450px;
            position: relative;
            z-index: 10;
            border: 1px solid rgba(255, 255, 255, 0.3);
            animation: slideIn 0.8s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(50px) scale(0.9);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .logo-section {
            text-align: center;
            margin-bottom: 40px;
        }

        .logo {
            font-size: 4rem;
            margin-bottom: 15px;
            animation: pulse 2s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        .logo-title {
            font-size: 1.8rem;
            font-weight: 700;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 8px;
        }

        .logo-subtitle {
            color: #718096;
            font-size: 1rem;
            font-weight: 500;
        }

        .form-section {
            margin-bottom: 30px;
        }

        .section-title {
            font-size: 1.4rem;
            font-weight: 600;
            color: #4a5568;
            margin-bottom: 25px;
            text-align: center;
            position: relative;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 50px;
            height: 3px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 2px;
        }

        .form-group {
            position: relative;
            margin-bottom: 25px;
        }

        .form-group input {
            width: 100%;
            padding: 18px 20px 18px 55px;
            border: 2px solid #e2e8f0;
            border-radius: 15px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.8);
            color: #2d3748;
        }

        .form-group input:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
            background: white;
            transform: translateY(-2px);
        }

        .form-group .icon {
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.2rem;
            color: #a0aec0;
            transition: color 0.3s ease;
        }

        .form-group input:focus + .icon {
            color: #667eea;
        }

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
        }

        .remember-me {
            display: flex;
            align-items: center;
            font-size: 0.9rem;
            color: #718096;
        }

        .remember-me input {
            width: auto;
            margin-right: 8px;
            accent-color: #667eea;
        }

        .forgot-password {
            font-size: 0.9rem;
            color: #667eea;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .forgot-password:hover {
            color: #764ba2;
            transform: translateY(-1px);
        }

        .login-button {
            width: 100%;
            padding: 18px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 15px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .login-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
        }

        .login-button:active {
            transform: translateY(-1px);
        }

        .login-button.loading {
            pointer-events: none;
            opacity: 0.8;
        }

        .loading-spinner {
            display: none;
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
            margin-right: 10px;
        }

        .login-button.loading .loading-spinner {
            display: inline-block;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .footer-links {
            text-align: center;
            margin-top: 30px;
            padding-top: 25px;
            border-top: 1px solid #e2e8f0;
        }

        .footer-links a {
            color: #718096;
            text-decoration: none;
            margin: 0 15px;
            font-size: 0.9rem;
            transition: all 0.3s ease;
        }

        .footer-links a:hover {
            color: #667eea;
            transform: translateY(-1px);
        }

        .error-message {
            background: linear-gradient(135deg, #fed7d7 0%, #feb2b2 100%);
            color: #c53030;
            padding: 15px 20px;
            border-radius: 12px;
            margin-bottom: 25px;
            font-size: 0.9rem;
            font-weight: 500;
            text-align: center;
            border: 1px solid #fca5a5;
            display: none;
            animation: shake 0.5s ease-in-out;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }

        .success-message {
            background: linear-gradient(135deg, #c6f6d5 0%, #9ae6b4 100%);
            color: #2f855a;
            padding: 15px 20px;
            border-radius: 12px;
            margin-bottom: 25px;
            font-size: 0.9rem;
            font-weight: 500;
            text-align: center;
            border: 1px solid #68d391;
            display: none;
            animation: fadeIn 0.5s ease-in-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Responsive */
        @media (max-width: 500px) {
            .login-container {
                margin: 20px;
                padding: 40px 30px;
                border-radius: 20px;
            }
            
            .logo-title {
                font-size: 1.5rem;
            }
            
            .form-options {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }
        }

        /* Tema oscuro para usuarios que prefieran */
        @media (prefers-color-scheme: dark) {
            .login-container {
                background: rgba(45, 55, 72, 0.95);
                color: #e2e8f0;
            }
            
            .logo-subtitle {
                color: #cbd5e0;
            }
            
            .section-title {
                color: #e2e8f0;
            }
            
            .form-group input {
                background: rgba(74, 85, 104, 0.8);
                border-color: #4a5568;
                color: #e2e8f0;
            }
            
            .form-group input:focus {
                background: #4a5568;
                border-color: #667eea;
            }
            
            .footer-links {
                border-top-color: #4a5568;
            }
        }

        .version-info {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.7);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.8rem;
            backdrop-filter: blur(10px);
        }

        /* Efectos adicionales */
        .login-container::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, transparent, rgba(102, 126, 234, 0.1), transparent);
            border-radius: 27px;
            z-index: -1;
            animation: borderGlow 3s ease-in-out infinite alternate;
        }

        @keyframes borderGlow {
            0% { opacity: 0.5; }
            100% { opacity: 1; }
        }